GOST 31444-2012

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  ГОСТ 31444-2012

GOST 31444−2012 Pipes from low-alloy steel for submarine sea pipelines. General specifications (with Amendment)

GOST 31444−2012

Group В62, В00, В69

INTERSTATE STANDARD

PIPES OF LOW-ALLOY STEEL FOR SUBMARINE SEA PIPELINES

General specifications

Pipes from low-alloy steels for submarine sea pipelines. General specifications

ISS 77.140.01
OKP 13 9000

Date of introduction 2014−01−01

Preface

Goals, basic principles and main procedure of works on interstate standardization have been established in GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−2009 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. Rules of development, adoption, application, renewal and cancellation"

Data on standard

1 DEVELOPED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders», Open joint stock company «Russian scientific research Institute of pipe industry» (JSC «RosNITI»)

2 SUBMITTED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders"

3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol of 15 March 2012 No. 49)

The adoption voted:

Short name of the country on MK (ISO 3166) 004−97	Country code MK (ISO 3166) 004−97	Abbreviated name of the national authority for standardization
Azerbaijan	AZ	Azstandart
Belarus	BY	Gosstandart Of The Republic Of Belarus
Kazakhstan	KZ	Gosstandart Of The Republic Of Kazakhstan
Kyrgyzstan	KG	Kyrgyzstandard
Russia	EN	Rosstandart
Uzbekistan	UZ	Uzstandard

4 this standard is developed on the basis of GOST R 53500−2009 «Pipes of low-alloy steel for submarine sea pipelines. General technical conditions"

5 by Order of the Federal Agency for technical regulation and Metrology of June 5, 2013 N 140th St interstate standard GOST 31444−2012 introduced as a national standard of the Russian Federation from January 1, 2014

6 INTRODUCED FOR THE FIRST TIME


Information about the changes to this standard is published in the annual reference index «National standards», and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet


AMENDED, published in the IUS N 3, 2016

An amendment made by the manufacturer of the database

Introduction

This standard was developed based on the regional standard DNV-OS-Ф101:2007* «Marine standard. Submarine pipeline systems» in regard to pipes of low-alloy steels.

In terms of most of the requirements for pipes of low-alloy manganese steels DNV-OS-Ф101:2007 has a reference to requirements of international standard ISO 3183:2007, Annex J, so the form of presentation of the standard is the chosen form of presentation of the draft standard GOST ISO 3183 «steel Pipe for pipelines for oil and gas industry. General technical conditions».
________________
* On the territory of the Russian Federation GOST ISO 3183−2012, here and hereafter. — Note the manufacturer’s database.

In this standard for the characteristic strength properties of steel used for the manufacture of pipes used designation of the strength classes.

1 Scope

This standard establishes the requirements for seamless and welded pipes of low-alloy steels intended for the construction of subsea pipelines in the oil and gas industry.

2 compliance

To ensure compliance with the requirements of this standard should be applied the quality management system according to the standard [1].

The manufacturer must ensure compliance of quality of pipes to the requirements of this standard. The consumer has the right to ensure that the manufacturer fulfils the established requirements and to reject any product not complying with these requirements.

3 Normative references

This standard uses the regulatory references to the following international standards:

GOST ISO 3183−2012 steel Pipes for pipelines for oil and gas industry. General specifications

(Amendment. ICS N 3−2016).

31458−2012 GOST steel Pipes products pipes. Documents on acceptance inspection

GOST 10006−80 (ISO 6892−84) of the Pipe metal. Test method tensile

GOST ISO 10124−2002 pressure steel Tubes seamless and welded (except pipe manufactured by arc welding under flux). Ultrasonic testing method of delamination
_______________
On the territory of the Russian Federation GOST R ISO 10124−99 «steel pressure Pipe seamless and welded (except pipe manufactured by arc welding under flux). Ultrasonic testing method of fibre bundles».


GOST ISO 10543−2002 pressure steel Tubes seamless and welded, drawn or hot worked. Method for ultrasonic thickness measurements
_______________
On the territory of the Russian Federation GOST R ISO 10543−99 «steel pressure Pipe seamless and welded drawn or hot worked. Ultrasonic thickness gaging».

Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.

4 Terms and definitions

This standard applies the terminology according to GOST ISO 3183, and the following term with the appropriate definition:

4.1 marine pipeline (submarine pipeline): Pipeline, which is part of the underwater pipeline system which, except for pipeline risers is located below the water level at maximum tide levels. The pipeline can be located completely or partially on the surface of the seabed or buried in the bottom of the sea.

5 Symbols and abbreviations

5.1 Notation

In this standard the following notation:

 — relative elongation after rupture, rounded to the nearest whole number, %;

 — the size of the mandrel (punch) testing is directed bend;

the cross — sectional area of pipe wall, mm;

the cross — sectional area of the mechanical seal, mm;

 — the distance between the walls of the matrix or the supports during the test for a directed bend;

carbon equivalent is calculated according to the formula of the International Institute of welding;

carbon equivalent calculated according to the chemical component of the formula ito-Bessy;

 — outer diameter of pipe, mm;

 — outer diameter of the tube after deformation, specified by the manufacturer, mm.

 — outer diameter of the tube before deformation specified by the manufacturer, mm.

 — depth of cut, mm;

 — coefficient of deformation;

the cross — sectional area of the specimen under the notch when tested for impact bending, mm;

the cross — sectional area of the working part of the specimen to tensile testing, mm;

 — the work of impact in the test sample with a V-shaped cut full size, j;

 — measured average work of impact in the test sample with a V-shaped cut full size, j;

 — pipe length, m;

is the mass per unit length pipe with smooth ends, kg/m;

 — the actual force generated by mechanical seals of the test set, N;

 — hydrostatic test pressure, MPa;

 — radius of mandrel (punch) testing is directed bend, mm;

 — radius of matrices for testing directional bend, mm;

 — the ultimate tensile strength, MPa;

 — yield strength (total elongation of 0.5%), MPa;

 — coefficient of deformation;

 — tangential stress at hydrostatic test, MPa;

 — equivalent Mises stress, MPa;

 — tangential stress, MPa;

 — axial stress;

 — test temperature, °C;

 — wall thickness of pipe, mm;

 — allowable minimum wall thickness of pipe, mm;

the transverse propagation velocity of ultrasound, m/s;

 — scanning speed;

the smallest beam width.

5.2 Reduction

In this standard, the following abbreviations are used:

CTOD — disclosure at the crack tip;

CVN — V-shaped incision;

CSR — coefficient of sensitivity to cracking;

CLR — the ratio of crack length;

CTR — the ratio of the thickness of the crack;

DAC — segment amplitude correction;

DWT — drop-weight tear;

EDI — electronic data interchange;

HAZ — heat affected zone;

HFW — method of fabrication of pipes by high frequency welding;

HIC — hydrogen induced cracking;

HV is the Vickers hardness;

IQI — standard image quality;

M — delivery condition of the tubes after thermomechanical rolling or thermomechanical forming;

MPQT — qualification tests of the technology of production of pipes;

MPS — manual production technology of pipes;

NDT — nondestructive testing;

N — delivery condition of the tubes after rolling with normalization, forming normalization, or normalizing and tempering;

Q — delivery condition of the tubes after quenching and tempering;

SAW — a method of manufacturing a pipe by arc welding under flux;

SAWH — method of manufacture of pipes with spiral seam arc welding submerged arc;

SAWL — a method of manufacturing a pipe with a longitudinal seam arc welding submerged arc;

SMLS — method for the manufacture of seamless pipes;

SSC — sulfide stress cracking;

WPS — technological instructions for the welding of pipes;

WPQR is the document about certification of welding technology.

6 Groups or classes in the strength of pipe and the delivery condition

6.1 Groups or classes of tubing strength

Groups or classes strength of the pipes must comply with table 1. The designation of a group or strength class is a combination of letters and numbers. Group or class strength identificeret level of strength of pipes and linked to the chemical composition of the steel. The designation of a group or class strength additionally contains the letters N, Q or M, which indicate the delivery condition of the tubes (table 1).


Table 1 — Groups or classes of durability of pipes and delivery condition

Delivery condition	Group strength class or strength
In the rolled condition with the normalization, forming normalization, normalization, or normalizing and tempering N	245N 245N or MKP
290N 290N or MKP
320N 320N or MKP
360N 360N or MKP
In state after quenching and tempering Q	245Q or MKP 245Q
290Q 290Q or MKP
320Q 320Q or MKP
360Q 360Q or MKP
390Q 390Q or MKP
415Q or MKP 415Q
Or MKP 450Q 450Q
485Q or MKP 485Q
555Q or MKP 555Q
In state after thermomechanical rolling or thermomechanical forming M	245M 245M or MKP
290M 290M or MKP
MKP 320M or 320M
360M 360M or MKP
390М or MKP 390М
415М or MKP 415М
450M 450M or MKP
485М or MKP 485М
555М or MKP 555М
For intermediate strength classes, the designation of steel should be agreed with the customer, but should be in the above format.

Notes

1 numerical part of the designation of groups or classes strength the specified minimum yield strength.

2 national standardization of the term «strength» is interchangeable with the term «strength class». In the letter part of the designation of the strength classes of pipes used for the pipelines of oil and gas industry (KP), the application of pipes for subsea pipelines added the letter M (manual).

3 Additional marking if delivery tubes, resistant to crack propagation — F (Appendix A).

4 Additional marking for supply of pipes for use in sour environments, — S (Appendix B).

5 Additional marking if delivery tubes, resistant to high local deformations, — R (Appendix C).

6 Additional marking for supply pipes with high requirements to dimensions — D (Annex D).

7 Additional marking for supply of pipes increased reliability — U (application D).

6.2 delivery Condition of pipes

When delivered, the condition of pipes shall conform to the requirements of the purchase order for the listed designation of a group or class strength, within acceptable conditions of supply are given in table 1.

7 information provided by the consumer

7.1 Mandatory information

The purchase order must contain the following information:

1) quantity (total weight or total length of pipes);

2) type of pipe (table 2);

3) designation of this standard;

4) group or a strength class of pipe (6.1);

5) outer diameter and wall thickness (9.9.1, table 9);

6) minimum design operating temperature ;

7) application a separate application of this standard (appendices A, B, C, d or E).

7.2 Additional information

7.2.1 After agreeing on the purchase order must indicate which of the following additional requirements apply to a specific order item:

1) supply of intermediate groups or classes strength pipe with minimum yield strength more than 290 MPa and the notation [table 1, footnote 1), table 2, footnote 1)];

2) the supply of SAWL pipes with outer diameter of 914.00 mm, with two seams [table 2, footnote 3)];

3) ultrasonic testing for the presence of delamination or mechanical damages of the edges of roll and sheet (8.3.11);

4) a method of production of rolled or sheet metal, used to produce welded pipes (8.3.9);

5) supply of SAWH pipe with butt weld ends or roll of sheet metal (8.9.2);

6) chemical composition of the metal pipes of intermediate groups or classes of strength (9.2.1);

7) maximum carbon equivalent for group strength 555Q or strength class MKP 555Q (table 4);

8) the sum of the mass fraction of niobium and vanadium in the chemical composition of the metal tubes in the delivery condition N or Q in excess of 0.06% [9.2.1, table 4, footnote 5)];

9) chemical composition of metal pipes with a wall thickness of 25 mm delivery condition N or Q and pipes with a wall thickness of 35 mm delivery condition M (9.2.2);

10) the tensile test at a temperature different from room, and the corresponding acceptance criteria (9.3.3);

11) temperature test the impact strength (CVN) for pipes with wall thickness more than 40 mm (9.7.2, table 8);

12) supply of pipes internal diameter and wall thickness (9.9.1, table 9, note 3);

13) delivery tubes in a different interval lengths (9.9.1.3);

14) trim the ends of the tubes different from the intended finish (9.10.2.1);

15) limit deviation of the outer diameter and the allowable ovality of pipe end wall thickness of 25.0 mm [9.9.3.1, table 10, footnote 3)];

16) the applicability of the limit deviation of the outer diameter to the inner diameter (9.9.3.1);

17) the ovality of the pipe ends with 75 (9.9.3.1, table 10);

18) limit deviation of the outer diameter and ovality of pipes with outside diameter of more than 1422 mm (9.9.3.1, table 10);

19) supply pipes with the negative limit deviation of wall thickness that differ from the established negative deviation [9.9.3.2, table 11, footnote 1)];

20) the minimum average length of pipe that is different from 12,10 m (9.9.3.3);

21) the height of the outer and inner cylinders of SAWL pipes (table 13);

22) provision of data on the weldability of the metal pipe and the maximum temperature of the heat treatment of pipes after welding (9.14);

23) certificate of passing the technical control 3.1 A, 3.1. C or acceptance (10.1.3);

24) supply of thick-walled large diameter pipes by the parties, consisting of several trunks (10.2.1);

25) the use of ring sample for expansion testing when determining yield stress in the transverse direction [see table 15, footnote 3)];

26) an alternative method of control of the displacement cylinders of the inner and outer pipe welds SAW (10.4.7.4);

27) hydrostatic test at a pressure different from the design pressure (10.4.8.5);

28) special methods of control of pipe sizes (10.4.11);

29) the percentage of the saved results of the control of pipe sizes (10.4.11.7);

30) non-destructive testing (Annex K):

a) the form of the report and documentation of results of nondestructive testing (K. 2.2);

b) testing to identify delaminations on pipe ends at a distance of 50 mm from the ends [K. 3.1, table A. 1, footnote 4)];

C) frequency of calibration of monitoring equipment in the manufacture of HFW pipes of coiled rolled (C. 4.1.8);

g) the use of alternative nondestructive methods and dimensions of artificial defects (K. 4.3.1, K. 4.3.2);

d) acceptance criteria when checking for separation of the pipe body ultrasonic method (K. 4.4.2.1, table K. 2);

e) method of testing of butt welds the ends of the rolled sheet or rolled (C. 4.5.2.5);

g) the artificial defect for flaw detection of the weld of SAW pipe with wall thickness of 19 mm or more for the detection of longitudinal and transverse imperfections [K. 4.5.3.4, the enumeration of a), b)];

s) configuration converters X-type for detection of transverse imperfections during ultrasonic testing of the weld seam of SAW pipes [K. 4.5.3.4, the enumeration g)];

K) threshold level equal to 80% of full screen height, with ultrasonic testing of the weld of SAW pipe for the detection of transverse imperfections [K. 4.5.3.4, enumeration d) 4)];

31) changed or additional marking (11.2);

32) location marking other than the one provided (11.2);

33) the marking of stamps or vibrotraining (11.2.3);

34) marking of pipes coating company that coated (11.2.4);

35) the coding length of the pipe (11.2.6);

36) the application of the paint marks (11.2.7);

37) the application of temporary external and/or internal coatings, special coatings (12.1).

7.2.2 At the delivery pipe, in accordance with the requirements of annexes A, B and/or b of this standard, after approval of the purchase order must contain the following data:

1) when delivered in accordance with the requirements of Appendix A5 the temperatures of the tests, including , for testing the impact strength (CVN), on the gap drop-weight (DWT), the impact strength (CVN) after aging;

2) upon delivery in accordance with the requirements of Annex B:

a) chemical composition for intermediate groups, or strength classes (B. 4.1.1 and B. 4.1.2);

b) chemical composition for tubes in delivery condition N and Q wall thickness of 25.0 mm (B. 4.1.1) and pipes the delivery condition M wall thickness 35.0 mm (B. 4.1.2);

C) limit values of chemical elements (footnote 1)-6) of tables B. 1 and B. 2);

d) increased hardness to 275HV10 for pipes with wall thickness more than 9 mm near the outer surface of the weld bead, heat affected zone (HAZ) and body tube (B. 4.3);

d) an alternative method of testing resistance to hydrogen induced cracking (HIC) and corresponding acceptance criteria (B. 4.2, B. 7.1.3);

e) photomicrographs of cracks caused by hydrogen cracking HIC (B. 7.1.4);

g) testing of resistance to sulfide stress cracking (SSC) for certification of the production technology (table B. 3);

and) alternative environment, the sample size for four-point bending test method of resistance to sulfide stress cracking (SSC) for certification of the production technology and the corresponding acceptance criteria (B. 4.4, B. 6.2, B. 7.2.2);

3) if delivery in accordance with the requirements of Annex V for each order item should be added to the pre-deformation and aging on the whole pipe or on the pipe sample from the full cross-section (V. 6.2).

8 production Technology

8.1 Method of production

Pipe supplied under this standard shall be made in accordance with the requirements and restrictions set forth in tables 2 and 3.


Table 2 — Acceptable processes of manufacture

Type of pipe	Group or class of durability of pipes
from 245 to 245 or MKP or MKP 555 555 all States delivery	555Q, 555М or 555Q MKP, MKP 555М
SMLS	X	-
HFW	X	-
SAWH	X	X
SAWL	X	X
If agreed, supply pipes intermediate grades 290 or strength classes over MKP 290. Tubes with a helical seam put an external diameter of 114.3 mm. If agreed, put a tube with two seams, but with a diameter of 914 mm.

Table 3 — Routes pipes

Type of pipe	The source material	Shaping of tubes	Heat treatment of pipes	Delivery condition
SMLS	Tubular billet	The deformation normalization	-	N
Hot deformation	Normalization	N
Quenching and tempering	Q
Hot deformation and processing of final cold	Normalization	N
Quenching and tempering	Q
HFW	Hot-rolled coil obtained by rolling with normalization	Cold forming	Normalization of the weld zone	N
Hot-rolled coil obtained by thermomechanical rolling	Heat treatmentof the weld zone	M
Heat treatmentof the weld zone and the removal of stresses throughout the pipe	M
Hot-rolled or hot-rolled coil rolling, obtained by rolling with normalization	Normalization	N
Quenching and tempering	Q
Cold forming followed by hot reducing under controlled temperature, allowing to provide a normalized condition	-	N
Cold forming followed by thermomechanical forming of pipe	-	M
SAW	Roll or rolled sheet subjected to normalization or obtained by rolling with normalization	Cold forming	Is absent, except when needed because of the degree of cold forming	N
Roll or flat products obtained by thermomechanical rolling	Is absent, except when needed because of the degree of cold forming	M
Hardened and tempered sheet metal	Q
Roll or rolled sheet in the as-rolled, thermomechanical-rolled, normalizing rolling or normalizing	Quenching and tempering	Q
Normalization	N
Shaping normalization	-	N
The applied heat treatment is specified in 8.8.

Pipe shall be manufactured according to the production technology, certified in accordance with Annex E.

8.2 Processes requiring validation

The final operations performed in the manufacture of pipes, affecting their compliance with the requirements of this standard (except chemical composition and dimensions) shall undergo a validation procedure.

Processes that require validation:

— for seamless, heat-treated pipe: heat treatment;

— for electric-welded pipes in the as-rolled: sizing, welding and heat treatment of the seam;

— for electric-welded heat-treated pipe: seam welding and heat treatment of tubes throughout the volume.

8.3 the Initial blank

8.3.1 the tubular billet, roll or sheet metal, is used as the initial billet for production of pipes, shall be made from the BOF or EAF method of production technology of clean steel.

Note To the steelmaking process can be likened to the production of steel in open-hearth furnaces with subsequent ladle refinement (processing plant ladle furnace).

8.3.2 Steel should be limp and manufactured with technology, providing the small grains.

8.3.3 the Width of the roll or the sheet metal used for the production of spiral-welded pipes, must be a multiple of not less than 0.8 and not more than 3.0 outside diameter of the pipe.

8.3.4 Any lubricating-cooling substances that pollute the area, cutting seam or surrounding areas, needs to be removed until you perform a longitudinal weld of pipe SAWL or spiral welds on the pipe SAWH.

8.3.5 Rolled and rolled sheet used for the production of pipes, shall be subjected to NDT in accordance with the requirements of Annex D, section G [2]. The control is subjected to each sheet or unwound roll or hold control at the edges of the coiled strip rolled.

8.3.6 If agreed upon, the roll and the rolled sheet before or after cutting the edges must be subjected by the manufacturer of pipes ultrasonic testing for the presence of delamination or mechanical damage in accordance with the requirements of Annex D, section G [2] or finished pipe shall be subjected to ultrasonic testing along the whole pipe.

8.3.7 Seamless pipe shall be made of rolled, forged or of billets, blooms or ingots. When using the final cold working is to be noted in the document of acceptance.

8.3.8 the ends of the pipe after hot deformation needs to be cut to a length sufficient for fixing defects.

8.3.9 Roll and sheet products for the manufacture of welded pipe shall be made of continuous cast billet or slab injection-molded, unless otherwise agreed. Pipes shall be SAW or HFW. Roll and sheet products do not have to have repair welds.

8.3.10 the Abutting edges of the rolled sheet or rolled prior to welding should be processed by milling or otherwise cutting. Width of roll and sheet is monitored constantly.

The weld and heat affected zone shall be completely normalized after welding.

8.3.11 Rolled and rolled sheet used for the production of pipes, shall be subjected to NDT in accordance with the requirements of Annex D, section G [2]. The control is subjected to each sheet or unwound roll or hold control at the edges of the coiled strip rolled.

8.3.12 Cold forming (i.e. at temperatures below 250 °C) shall not have residual deformation more than 5%, except in the cases of performing the heat treatment or when the aging tests under the effect of tension provide acceptable results.

8.3.13 pipe Forming and welding with subsequent normalization is performed in accordance with recommendations of manufacturers of rolled or sheet metal and consumables for welding work.

8.3.14 Should be used consumables for low hydrogen welding, resulting in the content of diffusible hydrogen not exceeding 5 ml per 100 g of weld metal. When welding pipe SAWL, if no results of comparative tests of the dependence of diffusible hydrogen from moisture in the flux, the content of residual moisture in agglomerated flux shall not exceed 0.03 percent.

8.3.15 Consumables for welding shall be individually marked and a certificate of acceptance, corresponding to GOST 31458. Welding wire must have a certificate of type 3.1, flux for arc welding SAW — type certificate 2.2.

8.3.16 Treatment of materials for welding, welding and quality assurance of welding shall meet the requirements of factory production instructions.

8.4 Technological welds

8.4.1 Technological welds must be made using the following welding methods:

a) semi-automatic arc welding under flux;

b) welding.

8.4.2 Technological welds must be:

a) melted and merged with the final weld bead;

b) removed by machining;

C) treated in accordance with G. 2 (Appendix G).

8.4.3 pipe-welding SAW is not allowed to execute intermittent technological joints, unless agreed by the consumer after providing the manufacturer’s data confirming conformity of the mechanical properties of discontinuous technological metal joints and metal seams between them, the requirements for the pipe body.

8.4.4 the welding process must be full penetration welds technology.

8.5 Weld seams in SAW pipe

In pipe welding SAW arc welding under flux at least one roller must be formed on the inner surface of the pipe and at least one roller on the outer surface of the pipe.

8.6 Weld seams on pipes with two seams

Of pipe with two welds for welded joints shall be located approximately 180° from each other.

8.7 Heat treatment of welded joints of pipes HFW

8.7.1 Weld seam and the entire heat affected zone (HAZ) pipes of all groups or classes strength should be subjected to normalization.

8.7.2 In the macrostructure of the weld of HFW pipe is not permitted harmful oxides produced during the welding process.

8.8 Cold deformation and cold expansion

8.8.1 the Coefficient of deformation for cold pipes shall not exceed 0,015, except when:

a) pipe subjected to a subsequent normalizing or hardening and tempering;

b) pipe subjected to cold deformation, is subjected to a subsequent heat treatment to relieve stresses.

8.8.2 strain Ratio for holodnodeformirovannyh pipes shall be not less than 0.003 and not more than 0,015. Cold expansion should not lead to high local deformations.

8.8.3 strain Ratio calculated by the following formula

, (1)

where is the outer diameter after deformation specified by the manufacturer, mm.

 — outer diameter before deformation specified by the manufacturer, mm.

 — the absolute value of the difference of outer diameter, mm.

8.8.4 strain Ratio at the cold calibration of pipe ends shall not exceed 0,015 if the pipe ends are not subjected to subsequent heat treatment to relieve stresses.

8.9 the Butt welds of the ends of the rolled sheet or rolled

8.9.1 On the finished tube with a longitudinal seam not allowed seam welds the ends of the roll or the sheet metal.

8.9.2 Pipe SAWH can be supplied with butt joints of the ends of the roll or the sheet metal under the condition that the butt joints located not less than 300 mm from the ends of the pipe and subjected to the same nondestructive inspection, which is subjected to edge roll or rolled sheet, in accordance with Annex D, section G [2].

8.9.3 If agreed, butt-welds to the roll or the sheet metal on the ends of spiral-welded pipes are allowed provided that they are separated at the respective ends of the pipes butt weld rolled sheet or rolled and spiral seam on distance not less than 150 mm in circumference.

8.9.4 Butt welds of rolled sheet or rolled on the finished spiral-welded pipes must be:

a) performed arc welding submerged arc or a combined arc welding and submerged arc welding a metal electrode in atmosphere of protective gas;

b) controlled by the same acceptance criteria, which are mounted to the spiral welds.

8.10 Stykovanie pipe

— Delivery stykovanii pipes.

8.11 Heat treatment

8.11.1 Heat treatment should be carried out in accordance with documented procedures used in certification tests of the production technology (MPQT).

8.11.2 Documented procedures shall conform to recommendations of the material manufacturer, taking into account the intensity of the heating and cooling time and temperature of exposure.

8.11.3 customer’s request, the manufacturer of pipes should provide information about the maximum temperature of the heat treatment of welded pipes after welding for the corresponding steel.

8.12 Traceability

The manufacturer must develop and comply with instructions for production technologies (MPS), ensuring the traceability of each individual tube to a heat number, lot number heat treatment, rooms controlled party and records all the necessary tests. Such procedures must include requirements to repair and records for control of pipe sizes and other types of control. Storage and handling must not cause damage to the marking of pipes.

9 acceptance Criteria

9.1 General provisions

9.1.1 General technical requirements for the supply of pipes shall conform to the requirements of the standard [3].

9.1.2 Pipe grades 415Q, 415М or strength classes 415Q MKP, MKP 415М and above shall be supplied instead of pipe ordered as pipe steel grades 360Q, 360M or strength classes 360Q MKP, MKP and 360M below, only with the agreement of the consumer.

9.2 Chemical composition

9.2.1 Chemical composition of steel welded and seamless pipes standard groups or classes of strength in the delivery condition N and Q wall thickness of 25.0 mm must meet the requirements of table 4, the chemical composition for intermediate grades shall be approved, but must conform to the requirements specified in table 4.


Table 4 — Chemical composition tubes 25.0 mm in the delivery state N and Q

Group or class strength and condition of supply pipes	Mass fraction of element analysis of melting and the product, %, not more									Carbon equivalent %, no more
								Other
245N 245N or MKP	0,14	0,40	1,35	0,020	0,010			0,04		0,36	0,19
290N 290N or MKP	0,14	0,40	1,35	0,020	0,010	0,05	0,05	0,04		0,36	0,19
320N 320N or MKP	0,14	0,40	1,40	0,020	0,010	0,07	0,05	0,04		0,38	0,20
360N 360N or MKP	0,16	0,45	1,65	0,020	0,010	0,10	0,05	0,04		0,43	0,22
245Q or MKP 245Q	0,14	0,40	1,35	0,020	0,010	0,04	0,04	0,04		0,34	0,19
290Q 290Q or MKP	0,14	0,40	1,35	0,020	0,010	0,04	0,04	0,04		0,34	0,19
320Q 320Q or MKP	0,15	0,45	1,40	0,020	0,010	0,05	0,05	0,04		0,36	0,20
360Q 360Q or MKP	0,16	0,45	1,65	0,020	0,010	0,07	0,05	0,04		0,39	0,20
390Q 390Q or MKP	0,16	0,45	1,65	0,020	0,010	0,07	0,05	0,04		0,40	0,21
415Q or MKP 415Q	0,16	0,45	1,65	0,020	0,010	0,08	0,05	0,04		0,41	0,22
Or MKP 450Q 450Q	0,16	0,45	1,65	0,020	0,010	0,09	0,05	0,06		0,42	0,22
485Q or MKP 485Q	0,17	0,45	1,75	0,020	0,010	0,10	0,05	0,06		0,42	0,23
555Q or MKP 555Q	0,17	0,45	1,85	0,020	0,010	0,10	0,06	0,06		In agreement
For each reduction of the mass fraction of carbon of 0.01% below the predetermined maximum mass fraction may be increased to a mass fraction of manganese of 0.05% compared with the established maximum mass fraction, the maximum increase should be no more than 0,20%. Total mass fraction of 0,060%, 0,012%, 2:1 (not applicable for steels deoxidized or treated with titanium). . . Unless otherwise agreed, the sum of the mass fraction of niobium and vanadium should be no more than 0.06%. The sum of the mass fraction of niobium, vanadium and titanium should not exceed 0.15 percent. Of 0.35%, 0.30 percent, 0.30 percent, 0.10 percent, of 0.0005%. For seamless pipes the specified value may be increased by 0.03%, but should be no more than 0.25%. Of 0.50% of 0.50% of 0.50% of 0.50% of 0.0005%.

Chemical composition of seamless pipes of the predefined groups or classes of strength in the delivery condition M wall thickness 35.0 mm must meet the requirements of table 5, the chemical composition for intermediate grades shall be approved, but must conform to the requirements specified in table 5.


Table 5 — Chemical composition of tubes of 35 mm in the delivery state M

Group or class strength and condition of supply pipes	Mass fraction of element analysis of melting and the product, %, not more									, %, not more
								Other
245M 245M or MKP	0,12	0,40	1,25	0,020	0,010	0,04	0,04	0,04		0,19
290M 290M or MKP	0,12	0,40	1,35	0,020	0,010	0,04	0,04	0,04		0,19
MKP 320M or 320M	0,12	0,45	1,35	0,020	0,010	0,05	0,05	0,04		0,20
360M 360M or MKP	0,12	0,45	1,65	0,020	0,010	0,05	0,05	0,04		0,20
390М or MKP 390М	0,12	0,45	1,65	0,020	0,010	0,06	0,08	0,04		0,21
415М or MKP 415М	0,12	0,45	1,65	0,020	0,010	0,08	0,08	0,06		0,21
450M 450M or MKP	0,12	0,45	1,65	0,020	0,010	0,10	0,08	0,06		0,22
485М or MKP 485М	0,12	0,45	1,75	0,020	0,010	0,10	0,08	0,06		0,22
555М or MKP 555М	0,12	0,45	1,85	0,020	0,010	0,10	0,08	0,06		0,24
When reducing the mass fraction of carbon for every 0.01% below the maximum mass fraction may be increased to a mass fraction of manganese of 0.05% in excess of the established maximum value, but not more than 0.20%. Total mass fraction of 0,060%, 0,012%, 2:1 (does not apply to steel raskalennye titanium or treated titanium). Of 0.35%, 0.30 percent, 0.30 percent, 0.10 percent, of 0.0005%. Total mass fraction of niobium, vanadium and titanium should not exceed 0.15 percent. Of 0.50% of 0.50% of 0.50% of 0.50% of 0.0005%. For wall thickness 25 mm parameter resistance to cracking of the weld metal when welding can be increased by 0.01%.

9.2.2 For pipes with wall thickness more than the above-mentioned chemical composition must be agreed upon.

9.2.3 pipe with a mass fraction of carbon in the steel analysis of the product, not exceeding 0.12 per cent, carbon equivalent , %, should be calculated according to the following formula

, (2)

where the symbols of chemical elements represent the mass fraction of the element in the steel in percent (tables 4 and 5).

If the analysis of the melting mass fraction of boron less than 0.0005%, then it is allowed to determine the boron content in the analysis of the product and to calculate count mass fraction of boron is equal to zero.

9.2.4 pipe with a mass fraction of carbon in the steel analysis of the product in excess of 0.12%, the carbon equivalent , %, should be calculated according to the following formula

, (3)

where the symbols of chemical elements represent the mass fraction of the element in the steel in percent (tables 4 and 5).

9.3 Mechanical properties tensile and hardness

9.3.1 Mechanical characteristics of pipes when tested in tension and hardness of the base metal, the weld and heat affected zone shall meet the requirements of table 6.


Table 6 — Requirements for the mechanical properties of the body pipe when testing transverse tensile specimens and hardness

Group, or strength class	Yield strength, MPa		Tensile strength, MPa		Attitude	Elongation , %	Hardness HV 10
base metal, weld	heat affected zone
not less than	no more	not less than	no more	no more	not less than	no more
245N, 245Q, 245M 245N or MKP, MKP 245Q, Inc 245M	245	450	415	760	0,93		270	300
290N, 290Q, 290N or 290M of MKP, MKP 290Q, Inc 290M	290	495	415	760	270
320N, 320Q, 320N 320M or MKP, MKP 320Q, Inc 320M	320	520	435	760	270
360N, 360Q, 360M or 360N MKP, MKP 360Q, Inc 360M	360	525	460	760	270
390Q, 390М 390Q or MKP, MKP 390М	390	540	490	760	270
415Q, 415М or 415Q MKP, MKP 415М	415	565	520	760	270
450Q, 450 M or 450Q MKP, MKP 450M	450	570	535	760	270
485Q, 485М 485Q or MKP, MKP 485М	485	605	570	760	300
555Q, 555М or 555Q MKP, MKP 555М	555	675	625	825	300
For intermediate grades, the difference between the specified maximum and a specified minimum yield stress shall be equal to the difference to the next higher group strength specified in this table; and the difference between the specified minimum tensile strength and the yield strength for the pipe body shall be equal to the difference to the next higher group strength specified in this table. For intermediate grades lower 555 or strength classes of MKP 555 tensile strength should not exceed 760 MPa. When testing specimens cut in the longitudinal direction, a minimum tensile strength less than the specified 5%. For tubes with an outer diameter of 219.1 mm, the maximum yield strength shall not exceed 495 MPa. Set the minimum elongation shall be calculated by the following formula , (4) where is the cross-sectional area of the corresponding sample for the tensile test, mm: — for cylindrical specimen: 130 mm — for samples with a diameter of 12.5 mm and 8.9 mm and 65 mmfor samples with a diameter of 6.4 mm; — sample the full cross-section of the smaller of the following values — a) 485 mm, or b) the cross sectional area of the sample, calculated on outside diameter and wall thickness of the pipe and rounded up to 10 mm; — for the samples in the form of a strip: smaller of the following values — a) 485 mm, or b) the cross sectional area of the sample, calculated according to the width of the sample and the thickness of the pipe wall and rounded up to 10 mm;  — minimum tensile strength, MPa. By agreement for pipe strength group 555 or strength class MKP 555 can be set more stringent maximum tensile strength.

9.3.2 the Limit of the tensile strength of the weld, including the butt joint of the ends of the roll or the sheet metal should be the same as for the base metal. When testing weld tensile fracture at the weld is not allowed.

9.3.3 If required to determine other strength properties at a temperature different from room, the acceptance criteria for these properties should be coordinated with the consumer.

9.4 Hydrostatic test

Pipe shall withstand the hydrostatic test without leakage through the weld seam or the pipe body.

9.5 flattening Test of HFW pipe

When tested on collapsed pipes HFW apply the following criteria:

a) for pipes of a group or class of strength with yield strength 415 MPa with wall thickness of 12.7 mm is not allowed the disclosure of the weld until the distance between the plates shall not be less than 66% of the outer diameter of the pipe. For all other combinations of a group or class of durability of pipes and wall thickness not allowed the disclosure of the weld until the distance between the plates shall not be less than 50% of the outer diameter of the pipe;

b) for pipes with a ratio of 10 are not allowed cracks or breaks on any part of the sample, except for the weld until the distance between the plates shall not be less than 33% of the outer diameter of the pipe.

Note — the weld seam is the distance from each side of the line of fusion equal to 6.4 mm for pipes with outside diameter of 60.3 mm, and 13 mm for pipes with outside diameter of 60.3 mm.

9.6 Test of the directional bend

9.6.1 except permitted in 9.6.2, the samples for testing are not allowed:

a) complete destruction;

b) cracks or breaks in the weld metal longer than 3.2 mm, regardless of depth;

C) cracks or breaks in the base metal, the heat affected zone (HAZ) or the fusion line longer than 3.2 mm or deeper than 12.5% of wall thickness.

9.6.2 Crack occurring in the test process on the edges of the test specimen, are not grounds for rejection, provided that their length does not exceed 6.4 mm.

9.7 Testing the impact strength of samples with V-notch (CVN)

9.7.1 General provisions

9.7.1.1 Test the impact strength (CVN) carried out on samples with a V-shaped notch (CVN) full size 10x10 mm.

If applicable samples of smaller size, the required minimum average value of the work of the strike (for a set of three specimens) shall be equal to the desired value for the samples full size, multiplied by the ratio of the width of the sample is smaller to the width of the full sample size, rounding the calculated values to the nearest whole number.

9.7.1.2 the value of the test result for the individual sample shall be not less than 75% of the required minimum average value of the work of the strike (for a set of three samples).

9.7.1.3 testing is allowed when the temperature is below the preset value, provided that test results at this temperature the requirements for the impact and content of the viscous component.

9.7.2 testing of the pipe body, weld and heat affected zone

9.7.2.1 the Requirements of the impact specimen with V-shaped cut full size 10x10 mm in the transverse direction for base metal, weld and heat affected zone shall be as specified in table 7, and the temperature tested in table 8.


Table 7 — Requirements for the impact of sample V-neck cut full size for base metal, weld and heat affected zone

Group, or strength class	The work of the impact specimen V-notch (CVN) full size, j
average	minimum
245N, 245Q, 245M 245N or MKP, MKP 245Q, Inc 245M	27	22
290N, 290Q, 290N or 290M of MKP, MKP 290Q, Inc 290M	30	24
320N, 320Q, 320N 320M or MKP, MKP 320Q, Inc 320M	32	27
360N, 360Q, 360M or 360N MKP, MKP 360Q, Inc 360M	36	30
390Q, 390М 390Q or MKP, MKP 390М	39	33
415Q, 415М or 415Q MKP, MKP 415М	42	35
450Q, 450 M or 450Q MKP, MKP 450M	45	38
485Q, 485М 485Q or MKP, MKP 485М	50	40
555Q, 555М or 555Q MKP, MKP 555М	56	45

Table 8 — Temperature test

Wall thickness , mm	Test temperature, °C
20
2040	-10 °C
40	In agreement
Note — the minimum operating temperature specified in the order. If not specified, then 0 °C.

Note — Value work of impact, shown in table 7, provide sufficient resistance to early destruction for most pipelines.

9.7.2.2 When using samples with thickness less than 10 mm for comparison with the values given in table 7, the measured average job impact needs to be converted to a work strike by the following formula

, (5)

where is the measured average impact work, j;

the cross — sectional area under the notch, mm.

9.7.2.3 From the set consisting of three samples with a V-shaped incision, only one sample is allowed to have the minimum value specified in table 7.

9.8 surface Condition, imperfections and defects

9.8.1 General provisions

9.8.1.1 Pipe in finished condition, must not have defects.

9.8.1.2 Pipe should not have cracks, cavities, lack of penetration.

9.8.2 Undercuts

Undercuts for pipe SAW, identified during visual inspection shall be investigated, classified and treated as follows:

a) the undercut depth is less than 0.2 mm, acceptable regardless of length, must be processed in accordance with G. 1 (Annex G);

b) undercuts with a depth of more than 0.2 but not more than 0.5 mm, it is permissible under the following conditions:

1) the length of undercut shall not exceed 100 mm;

2) on any part of the weld length of 300 mm, the total length of the undercut is not more than 4, but a maximum of 100 mm;

3) all undercuts are treated in accordance with G. 2 (Appendix G);

in) undercut depth of more than 0.5, but not more than 1.0 mm, are permissible under the following conditions:

1) the length of individual undercuts — not more than 50 mm;

2) on any part of the weld length of 300 mm, the total length of the undercut is not more than 4, but a maximum of 100 mm;

3) all undercuts are treated in accordance with G. 2 (Appendix G);

g) undercuts that exceed the limits set in the enumeration b), shall be classified as defects and treated in accordance with J. 3 (Annex G).

9.8.3 Burns

9.8.3.1 Burns shall be classified as defects.

Note — Burns are localized points of surface melting caused by arcing between electrode or ground and pipe surface.

9.8.3.2 Burns should be treated in accordance with J. 2 or J. 3 [enumeration of a) or b), Annex J], if they can’t be removed by grinding or machining, after which the resulting recess shall be thoroughly cleaned and checked for completeness of removal of the defect by etching a 10% solution of ammonium persulfate or a 5% solution nitalia.

9.8.4 Bundle

Facing the end of a pipe or chamfer stratification or inclusion whose length is the circumference of the visual determination is greater than 6.4 mm shall be classified as defects. Pipe with such defects shall be rejected or trimmed as long as the pipe ends will not remain traces of such delaminations or inclusions.

9.8.5 Geometric tolerance symbol and dents

9.8.5.1 except For the dents, geometric deviations from the correct cylindrical form welded pipe (such as flat concavity and convexity) that arise in the process of forming tubes or technological operations are greater than 0.005or 2.5 mm (which is smaller), measured in a straight line between the extreme point of deflection and the line of prolongation of the normal contour of the pipe, shall be considered defects and to be treated in accordance with J. 3 [enumeration of a) or b), Annex J].

9.8.5.2 Geometric deflection must be measured with a caliber for a given inner/outer diameter. Caliber length must be 200 mm or 0.25, whichever is less.

9.8.5.3 Geometric deviation from the correct cylindrical shape of the pipe (such as flat concavity and convexity), except for dents, check for 10% made pipe, but not less than four pipes per eight-hour shift.

9.8.5.4 the length of the dent in any direction shall be not more than 0.5, and the depth, measured in a straight line between the extreme point of deflection and the line of prolongation of the normal contour of the pipe, shall not exceed the following values:

a) 3,2 mm — for dents with a sharp bottom, formed by cold shaping;

b) 6.4 mm — for the rest of the dents;

in) 1.0 mm — for nicks on the length up to 100 mm from the pipe end.

Dents that exceed the specified limits shall be considered defects and shall be treated in accordance with J. 3 [enumeration of a) or b), Annex J].

9.8.6 Areas of high hardness

Areas of high hardness greater than 50 mm in any direction and within 100 mm from the ends of the pipe, regardless of the size of the plot shall be considered defects, if their hardness exceeds 300 HV10 for pipes intended for works in non-acidic environment, and 250 HV10 in acidic medium for individual prints. Pipe with such defects shall be treated in accordance with the requirements of J. 3, [the enumeration of a) or b), Annex J].

9.8.7 Other surface imperfections

Other surface imperfections detected by visual inspection shall be investigated, classified and treated as follows:

a) imperfections to a depth of not more than 0.05or 0.5 mm, whichever greater, but maximum 0.7 mm for 25 mm max 1.0 mm to 25 mm does not reduce the wall thickness below minimum acceptable values, should be classified as acceptable imperfections and treated in accordance with the requirements of Zh 1 (Annex G);

b) imperfections with a depth of more than 0.05, it does not reduce the wall thickness below the minimum permissible values, shall be classified as defects and cleaned by an abrasive method, in accordance with G. 2 (Appendix G) or treated in accordance with J. 3 (Annex G);

C) imperfections reducing the wall thickness below the minimum permissible values, shall be classified as defects and treated in accordance with J. 3 (Annex G).

Note The «imperfections reducing the wall thickness below minimum acceptable values," you see the imperfections, wall thickness which less than the minimum acceptable value.

9.9 Dimensions, mass and deviations

9.9.1 Size

9.9.1.1 Pipes shall be supplied in the sizes specified in the purchase order, subject to permissible variations.

9.9.1.2 Outer diameter and wall thickness should be within the permissible limits specified in table 9.


Table 9 — Permissible outside diameter and wall thickness

In millimeters

The outer diameter	Wall thickness
Special pipe with smooth ends	The conventional tube with smooth ends
10.3 to 13.7	From 1.7 to 2.4 incl.
From 13.7 to 17.1	From 2.2 to 3.0 incl.
From 17.1 to 21.3 per	From 2.3 to 3.2 incl.
From 21.3 to 26.7	From 2.1 to 7.5 incl.
From 26.7 to 33.4	From 2.1 to 7.8 incl.
From 33,4 to 48.3	From 2.1 to 10.0 incl.
From 48,3 60,3 to	From 2.1 to 12.5 incl.
From up to 60,3 73,0	From 2.1 to 3.6 incl.	SV. Of 3.6 to 14.2 incl.
From of 73.0 to 88.9	From 2.1 to 3.6 incl.	SV. 3.6 to 20.0 incl.
From up to 88,9 101,6	From 2.1 to 4.0 incl.	SV. 4,0 to 22,0 cyl.
From up to 101,6 168,3	From 2.1 to 4.0 incl.	SV. 4.0 to 25.0 incl.
From 168,3 to of 219.1	From 2.1 to 4.0 incl.	SV. 4.0−40.0 incl.
From of 219.1 up to 273.1	From 3.2 to 4.0 incl.	SV. 4.0−40.0 incl.
From up to 273.1 323.9 m	From 3.6 to 5.2 incl.	SV. 5.2 to 45,0 incl.
From 323.9 m up to 355,6	From 4.0 to 5.6 incl.	SV. 5.6 to 45,0 incl.
From 355,6 to 457,0	From 4.5 to 7.1 incl.	SV. 7.1−45,0 incl.
From 457,0 559,0 to	From 4.8 to 7.1 incl.	SV. 7.1−45,0 incl.
From 559,0 to 711,0	From 5.6 to 7.1 incl.	SV. 7.1−45,0 incl.
From 711,0 to 864,0	From 5.6 to 7.1 incl.	SV. 7.1−52,0 incl.
From 864,0 to 965,0	SV. 5.6 to 52,0 incl.
From 965,0 to 1422,0	SV. Of 6.4 to 52.0 incl.
From 1422,0 to 1829,0	SV. 9.5 to 52,0 incl.
From 1829,0 to 2134,0	SV. 10.3 to 52,0 incl.
Pipe with this combination of outer diameter and wall thickness, called the special pipes with smooth ends. Pipe having other combinations listed in this table are referred to as conventional pipes with smooth ends. Pipe with an intermediate combination of outer diameter and wall thickness, relative to those presented in this table are considered to be special pipes with smooth ends, if the next smaller combination specified in the table refers to special pipes with smooth ends; pipes with other intermediate combinations are considered to be conventional pipes with smooth ends. Notes 1 Standardized values of outer diameter and wall thickness of tubes are given in the standards [3] and [4]. 2 In the national industry standardized values of outer diameter and wall thickness of pipes given in the standards assortment of pipes depending on their method of production. 3 By agreement between the consumer and the manufacturer of the pipe delivered in accordance with the internal diameter.

9.9.1.3 Pipes shall be supplied in length from 11,70 to 12.70 m, unless otherwise agreed.

9.9.2 Mass per unit length

The mass per unit length , kg/m, calculated by the following formula

, (6)

where  — wall thickness, mm;

 — external diameter, mm.

Notes

1 the nominal mass of a pipe is the product of its length per unit mass.

2 Formula (6) does not account for the increased weight of the pipe due to the weight gain of the weld or welds. In the national industry, it is recommended to calculate the mass per unit length of welded pipe according to the formula (6) by multiplying it by the correction factor equal to: 1,010 — for spiral-welded and longitudinally welded pipes with single seam; 1,015 for longitudinally welded pipes with two seams.

9.9.3 Limit deviations of the diameter, wall thickness, length and straightness

9.9.3.1 Limit deviation of the outer diameter and ovality of pipes shall not exceed the values given in table 10. The negative deviation of outer diameter and ovality are not applicable to the sites of repair of defects by grinding.


Table 10 — maximum deviations of diameter and ovality

In millimeters

The outer diameter	Maximum deviation of diameter				Ovality
pipe, except for ends		pipe ends		pipe, except for ends	pipe ends
Seamless pipe	Welded pipe	Seamless pipe	Welded pipe
To 60,3	±0.5 or ±0,0075 that more	±0.5 or ±0,0075 that more but not more than ±3,2	±0.5 or ±0,005 , which is more but not more than ±1,6		Within the limits of deviation of diameter
From 60,3 to 610 incl.	0,015	0,01
SV. 610 to 1422 incl.	±0,01	±0,005 , but not more than ±4,0	±2,0	±1,6	For 75 Of 0.01 but not more than 10; for 75 by agreement	For 75 0,0075 , but not more than 8; for 75 by agreement
SV. 1422	In agreement
The dimensions of the pipe body measured approximately in the middle of the length of the pipe. The end of the pipe is the section length of 100 mm from each pipe end. For seamless pipes, the maximum deviations are used for tubes 25.0 mm, limit deviations for pipes with greater wall thickness should be consistent. For ekspandirovannogo pipes of an external diameter of 219.1 mm and rexpanderbox pipes, maximum deviations of diameter and ovality may be determined according to the calculated inner diameter (outer diameter minus double the wall thickness) or, if agreed, according to the measured inner diameter instead of outer diameter (9.9.3.1).

If agreed, the limit deviation specified in table 10 can be applied to the inner diameter of the pipe.

9.9.3.2 Limit deviation of the wall thickness shall not exceed those specified in table 11.


Table 11 — Limit deviation of wall thickness

In millimeters

Wall thickness	Limit deviation
Seamless pipe (SMLS)
To 4.0	+0,600 -0,500
From 4.0 to 10.0	+0,150 -0,125
From 10.0 to 25.0	±0,125
From 25.0	+3,7 +0,1; more Is 3.0 or -0,1; more
Pipe HFW
To 6.0 incl.	±0,400
SV. 6.0 to 15.0 incl.	±0,700
SV. 15,0	±1,000
Pipe SAW
To 6.0 incl.	±0,500
SV. 6.0−10.0 incl.	±0,700
SV. 10.0 and 20.0 incl.	±1,000
SV. 20,0	+1,500 -1,000
If the purchase order specified negative limit deviation of the wall thickness is less than specified in this table, the plus tolerance should be increased enough to maintain acceptable field deviations. Positive deviation in wall thickness does not apply to the weld zone.

9.9.3.3 the Average length of the pipes must be at least 12,10 m, unless otherwise agreed.

9.9.3.4 the Deviation from straightness shall not exceed the following values:

a) a deviation from the General alignment of 0.15% of the total length of the pipe, as shown in figure 1;

Figure 1 — Measurement of total straightness

1 — a taut string or wire; 2 — pipe

Figure 1 — Measurement of total straightness

b) deviations from the limit of the straightness and 3.0 mm in length of 1000 mm from each end, as shown in figure 2.

Figure 2 — Measuring end straightness

1 — ruler; 2 — pipe

Figure 2 — Measuring end straightness

9.9.3.5 the additional requirement can be supplied pipe with more precise geometric dimensions (Appendix d), as indicated by index D in the marking of these tubes.

9.10 Finishing of pipe ends

9.10.1 General provisions

9.10.1.1 Pipes shall be supplied with smooth ends without thread.

9.10.1.2 At the ends of the pipes should be free of burrs.

9.10.1.3 any crooked areas of the pipe ends measured as shown in figure 3, should not exceed 1,6 mm.

Figure 3 — any crooked areas of the pipe end

Figure 3 — any crooked areas of the pipe end

9.10.2 Finish ends

9.10.2.1 Unless otherwise agreed, pipe shall be supplied with a perpendicular cut ends and they should be free of burrs.

9.10.2.2 the Internal bead of the weld should be removed to a height of from 0 to 0.5 mm in length not less than 100 mm from both ends of the pipe.

9.10.2.3 to harmonize the outer bead of the weld should be removed to a height of from 0 to 0.5 mm in length not less than 250 mm from both ends of the pipe. The transition to the base metal of the pipe should be smooth and without apparent steps.

9.10.2.4 Unless otherwise agreed, the ends of tubes with smooth ends wall thickness of 3.2 mm should be bevelled for welding. The angle of chamfer measured from the line perpendicular to the pipe axis must be 30°+5°, the width of the end scene — (1,6±0,8) mm.

9.10.2.5 If it is carried out mechanical processing of the inner surface of the pipe, the angle of internal chamfer measured from the longitudinal axis of the pipe, shall not exceed the following values:

a) for seamless pipe (SMLS) — the values given in table 12;

b) for the weld seam of welded pipe — 7,0°.


Table 12 — Maximum angle of internal chamfer for seamless pipe (SMLS)

Wall thickness , mm	The maximum angle of the internal chamfer
To 10.5	7,0°
From 10.5 to 14.0	9,5°
From 14.0 to 17.0	11,0°
From 17,0	14,0°

9.11 Limit deviations for weld

9.11.1 the Radial displacement of the edges of the rolled sheet or rolled

For HFW pipe, the radial offset of the edges of the rolled sheet or rolled (figure 4a) must not reduce the remaining wall thickness in the weld less than the minimum allowable.

Figure 4 — Deviation of the sizes of the weld

1 — residual wall thickness in the weld

and Radial offset of the edges of the rolled sheet or rolled on pipes HFW

1 — the outer radial displacement; 2 — height of external weld bead; 3 — height of the internal weld bead; 4 — internal radial offset

b — the Radial offset of the edges of the roll or the sheet metal and the height of the rollers of the weld on the pipe SAW

1 — offset

in the Offset rollers of the weld on the pipe SAW

Figure 4 — Deviation of the sizes of the weld

For SAW pipes, the radial offset of the edges of the rolled sheet or rolled (figure 4b, or figure 4inwhich is applicable) must not exceed the allowable values specified in table 13.

(Amendment. ICS N 3−2016).

Table 13 — Tolerances for weld

Location or appearance of imperfections	The tolerance for the weld
Outer seam	Welds should have a regular surface structure and move smoothly into base metal, not speaking beyond the original cutting weld is more than 3 mm (5 mm for SAW welds)
The bead height of the outer and inner joints for pipes SAWL	Exterior welds: for 13 mm is not more than 3.0 mm; for 13 mm is not more than 4.0 mm. Welded internal seams: not more than 3.5 mm
The melting of the weld (for pipes HFW)	External fusing must be ground flush with base metal. Internal fusing shall not protrude above the base metal of more than 1.5 mm. Trimming must not reduce the thickness of the wall is lower than before and the seizure of the sweep must have a smooth transition to the base metal. Allowed incisions depth max 0.3 mm +0,05
The bead height of the outer and inner seam (double sided welds)	Height of <0.2, but not more than 4 mm
The height of the outer seam of the cushion (single sided welds)	Height of <0.2, but not more than 4 mm
The concavity of the outer weld	Not allowed
The concavity of the weld root	The thickness of the weld shall not be less than
The radial offset of edges for pipes SAWL	For 15 mm and not more than 1.3 mm; 15 to25 mm not more than 0.1mm; for 25 mm not more than 2.0 mm
The radial offset of edges for HFW pipes	The thickness of the weld seam shall be not less than
The displacement of the outer seam with respect to the internal	For 20 mm is not more than 3.0 mm; for 20 mm is not more than 4.0 mm
The oscillation of the weld (the weld seam deviation from a straight line)	Not more than 0.2, but maximum 4.0 mm
Undercut	Separate undercuts		The total length for any 300 mm weld
Depth	Allowed length
1.0 mm	Not allowed	-
1.0 mm0.5 mm	50 mm	No more than 4, but a maximum of 100 mm
0.5 mm0.2 mm	100 mm	Not limited
0.2 mm	Not limited
Crack, burn-through arc discharge, the start/end craters, an unsuccessful attempt to restore the welding after the breakage of the arc, the pores of the surface	Not allowed
Lack of fusion/ lack of penetration	Permissible length of single mismatches — no more , but a maximum of 25 mm. The total length for any 300 mm of weld of not more than 50 mm
Through-penetration	The thickness of the weld at any point not less than and a separate length/width of not more than /4 but a maximum of 4 mm in any direction. The total length for any 300 mm of weld of not more than /2, but a maximum of 8 mm

9.12 Micrographically and metallographic examination

9.12.1 Macrochenia should demonstrate a high quality weld, fades into the base metal without weld defects in accordance with the criteria specified in table 13.

For pipe SAW must be demonstrated complete melting of the tack welding of the welds. For certification testing of manufacturing technology welds shall conform to the requirements of the standard [4].

9.12.2 the alignment of the inner and outer seams for SAW pipes shall be verified on macrochenia, if you do not use other alternative methods demonstration of their capabilities.

9.12.3 Metallographic examination shall be documented by photomicrographs with a sufficient increase in order to demonstrate that along the line of welding there are no harmful oxides from the welding process.

9.12.4 you Need to ensure that the heat affected zone has been completely subjected to appropriate heat treatment throughout the wall thickness, and left notusing martensite.

9.13 maximum deviation of the mass

9.13.1 except as provided in 9.13.2, the maximum deviations of the mass of individual tubes or of the party of pipes of the nominal weight of pipe calculated by multiplying its length by the weight per unit length of pipe (9.9.2) shall not exceed: % of the nominal mass of a pipe.

9.13.2 If the purchase order specified lower limit deviation of the wall thickness less than the corresponding deviation shown in table 11, the upper limit of mass deviation should be increased by the percentage equal to the corresponding percentage reduction in the lower limit deviation of the wall thickness.

9.14 the weldability of the metal pipe

9.14.1 If agreed, the manufacturer shall provide information on weldability for the corresponding steel or to test of weldability in accordance with the test conditions and acceptance criteria specified in the purchase order.

Requirements for the chemical composition of the steel and, in particular, the limit values of and (tables 4 and 5) was selected to improve the weldability of metals, however, be aware that the behaviour of steel during welding and after it depends not only on the chemical composition of the steel, but also from applied materials, conditions of preparation and execute the weld.

9.14.2 Upon the customer’s request, the manufacturer of pipes shall be obliged to provide information about the maximum temperature of the heat treatment.

10 Control

10.1 Acceptance documents

10.1.1 compliance with the requirements of the purchase order must be checked by a special control in accordance with GOST 31458.

10.1.2 Acceptance documents should be applicable in printed or electronic form in the electronic data interchange (EDI) corresponding to any agreement on electronic data exchange between the consumer and the manufacturer.

10.1.3 the Manufacturer shall provide the consumer with a certificate of completion of technical control 3.1 according to GOST 31458, if the order is not specified on the certificate of passage of technical control 3.1 A, 3.1 C or of the certificate of acceptance according to GOST 31458.

10.1.4 the Following information, if applicable, must be specified on each order:

a) outer diameter, wall thickness, type of pipe, group, or class strength, the status of the delivery, the melting number, batch number, heat treatment, number of pipes;

b) chemical composition (smelting and product) and carbon equivalent (product analysis and acceptance criterion);

C) the results of the tensile tests, the type, size, location and orientation of samples for testing;

g) test results on impact bending of specimens with a V-shaped notch (CVN); temperature tests, size, location and orientation of samples; acceptance criteria for the samples used special size;

d) specified minimum hydrostatic test pressure and specified test duration;

e) for welded pipes — used method of nondestructive testing of the weld (x-ray, ultrasonic or electromagnetic), as well as the type and size of artificial defect used or standard quality image;

g) for seamless pipe (SMLS) — use the method of non-destructive testing (ultrasonic, electromagnetic or magnetic particle) and the type and size of artificial defect used;

I) for HFW pipe, the minimum temperature of heat treatment of the weld;

K) the results of other tests and measurements, including the results of additional tests in annexes A, B, C, G or D, or a link to the report with the test results.

10.2 Frequency control

10.2.1 Frequency of control tubing shall be as defined in table 14.


Table 14 — Frequency of control pipes

Control	Type of pipe	The frequency of the control	The criterion of acceptance
Analysis of melting	All the pipes	One analysis from melting steel	9.2, tables 4 and 5
Analysis of the product	All the pipes	Two analyses from melting steel (selected from different products)	9.2, tables 4 and 5
Tensile testing of the pipe body	All the pipes	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.3.1, table 6
Test for impact strength (CVN) body pipe outer diameter 114.3 mm and wall thickness specified in table 17	All the pipes	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.7.2, table 7
Hardness control on the thickness of the body wall of tubes	All the pipes	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.3.1, table 6
Hydrostatic test	All the pipes	Each pipe	9.4
Inspection of geometrical deviations of form pipes	All the pipes	10% of the pipes from the party, but minimum 4 pipes per 8-hour shift	9.8.5
Control of the diameter and ovality of the pipe body	All the pipes	One test on a controlled batch of not more than 100 or 20pipes	9.9.3.1, table 10
Control of the thickness of the body wall of tubes	All the pipes	Each pipe	9.9.3.2, table 11
Control length	All the pipes	Each pipe	9.9.3.3
Alignment control	All the pipes	5% of the pipes from the party, but minimum 4 pipes per 8-hour shift	9.9.3.4
Control of geometrical parameters of pipe ends	All the pipes	5% of the pipes from the party, but minimum 4 pipes per 8-hour shift	9.10.1.3
Visual inspection	All the pipes	Each pipe, if not agreed upon an alternative method of control	9.8
Non-destructive testing	All the pipes	In accordance with the Annex To	App To
Weighing	All the pipes	Each tube or bundle of tubes	9.13
Tensile testing of the longitudinal or helical seam pipes of an external diameter of 219.1 mm	HFW, SAWL, SAWH	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.3.1, table 6
Test for impact strength (CVN) longitudinal or spiral seam and heat affected zone (HAZ) of the pipe outer diameter 114.3 mm and wall thickness specified in table 18	HFW, SAWL, SAWH	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.7.2, table 7
Hardness control plots increased hardness, welded pipe cold forming	HFW, SAWL, SAWH	Any area of increased hardness greater than 50 mm in any direction	9.8.6
Control of hardness on the wall thickness of the longitudinal or helical seam and heat affected zone (HAZ)	HFW, SAWL, SAWH	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.3.1, table 6
Test of a directional bend in the longitudinal or spiral weld	SAWL, SAWH	One test on a controlled batch of not more than 100 or 50pipe with the same ratio of cold ekspedirovanie	9.6
Control of macrostructure of longitudinal or spiral welded seam	SAWL, SAWH	Minimum one test per shift plus test for any change to the size of the pipes during the work shift; if applicable, alternative methods of control — at the beginning of the production of each combination of outside diameter and wall thickness	9.12
Tensile test of butt joint of rolled or sheet metal pipes of an outer diameter of 219.1 mm	SAWH	One test on a controlled batch of not more than 50 pipes with the same ratio of cold ekspedirovanie	9.3.2, table 6
Test for impact strength (CVN) butt joint ends of a rolled sheet or rolled pipes outer diameter 114.3 mm and wall thickness specified in table 17	SAWH	One test on a controlled batch of not more than 50 pipes with the same ratio of cold ekspedirovanie	9.7.2, table 7
Test directed bend butt joint rolled sheet or rolled	SAWH	One test on a controlled batch of not more than 50 pipes with the same ratio of cold ekspedirovanie	9.6
Flattening tests;	HFW	As shown in figure 6	9.5
Metallographic examination of the weld	HFW	Minimum one test per shift plus test for any change to the size of the pipes during the work shift; if applicable, alternative methods of control — at the beginning of the production of each combination of outside diameter and wall thickness	9.12
In the manufacture of tubes from tube billets supplied by a third-party manufacturer’s acceptance of the chemical composition of the melt is carried out at a document about the quality of the manufacturer of the workpiece, without the control of chemical composition. For tubes with an external diameter of 508 mm and not more than 100 pipes, of an external diameter of 508 mm and not more than 50 tubes. The ratio of cold ekspedirovanie set by the manufacturer and calculated on the outside diameter or circumference before and after ekspedirovanie. Increase or decrease the ratio of cold ekspedirovanie more than 0,002 requires the formation of a new party. For pipes with outer diameter of 114.3 mmto 508 mm and not more than 100 pipes, of an external diameter of 508 mm and not more than 50 tubes. For tubes with an outer diameter of EUR 168.1 mm — not more than 100 pipes, but not less than 1 and not more than 6 pipes per 8-hour shift, an outer diameter of EUR 168.1 mm — not more than 20 pipes. For pipes with outer diameter 114.3 mm — each tube or bundle of tubes, of an external diameter of 114.3 mm to each tube. For tubes with an outer diameter of 219.1 mm508 mm — not more than 100 pipes, of an external diameter of 508 mm and not more than 50 tubes. Additionally, at least once a week should be tested for pipe manufactured for each welding unit. On pipes with two longitudinal welds shall be tested both seam pipe representing the controlled party.

(Amendment. ICS N 3−2016).

When a significant supply of thick-walled large diameter pipes for which the controlled party is determined by the volume of melt, can be harmonized unification in a single party controlled several heats. The frequency of testing of the first 30,000 t of pipes shall be as defined in table 14, the subsequent pipes with the following requirements:

controlled party can consist of pipes no more than three heats;

— in case of unsatisfactory test results controlled party frequency of test, again, is specified in table 14 to obtain satisfactory results subsequent 30,000 t of pipes.

10.3 samples and specimens for testing

10.3.1 Samples for chemical analysis

Samples for analysis of melting and analysis of products should be selected and prepared in accordance with the standard [5].

10.3.2 samples and specimens for mechanical testing

10.3.2.1 General provisions

The sample must be selected, and samples should be produced for the tensile tests, impact strength of samples with V-notch (CVN) directed bend and flattening of the pipes after heat treatment, ekspedirovanie and final processing in accordance with the applicable standards.

Samples cut by any method which does not affect the mechanical properties of the products.

Samples and specimens for different tests should be selected from the plots shown in figures 5 and 6, and in accordance with the table 15 and with the additional requirements specified in 10.3.2.2−10.3.2.7.

Figure 5 — the Orientation and location of samples and specimens for testing

1 L — longitudinal sample; 2 — T — transverse sample

and — Seamless pipe

1 — W — transverse sample from welded seam along the axis of the sample; 2 — Kzt180, — transverse sample, located approximately 180° from the longitudinal weld 3 — T90 — transverse sample, located approximately 90° from the longitudinal weld; 4 — L90 — longitudinal sample, are located approximately 90° from the longitudinal weld

Note From duhovnoi pipe cross-section sample 2 taken from the second weld.

b — Pipe HFW and SAWL

1 — W — transverse sample from welded spiral seam along the axis of the sample; 2 — L — longitudinal sample, located at a distance of not less than /4 in the longitudinal direction from the helical weld 3 T — transverse sample, located at a distance of not less than /4 in the longitudinal direction of the spiral weld 4 — butt weld of the ends of the roll or the sheet metal length ; 5 WS — transverse sample, located at a minimum distance of /4 from the intersection of spiral weld and butt weld rolled sheet or rolled

in — Pipe SAWH

Figure 5 — the Orientation and location of samples and specimens for testing

Figure 6 — flattening Tests

1 — weld; 2 — end of the roll; 3 — two samples for testing from each end of the roll; 4 — the stop of the weld; 5 — two test specimen on each side of the spot weld

Figure 6 — flattening Tests

Table 15 — Number, orientation and location of specimens for mechanical testing of pipes

Type of pipe	The location of the sample	Type of test	The number, orientation and location of the samples from the samples
Wall thickness, mm
up to 25 incl.		St. 25
External diameter, mm
to of 219.1	from of 219.1	to of 219.1	from of 219.1
SMLS expendirure	The body of the pipe	Stretching	1L	1L	1L	1L
Impact strength (CVN)	3T	3T	3T	3T
Hardness control	1T	1T	1T	1T
SMLS holodnokatanaja- bathrooms	The body of the pipe	Stretching	1L	1T	1L	1T
Impact strength (CVN)	3T	3T	3T	3T
Hardness control	1T	1T	1T	1T
HFW	The body of the pipe	Stretching	1L90	1Т180	1L90	1Т180
Impact strength (CVN)	3Т90	ЗТ90	ЗТ90	ЗТ90
Weld	Stretching	-	1W	-	1W
Impact strength (CVN)	3W 3 HAZ		6W and 6 HAZ
Hardness control	1W	1W	1W	1W
Metallographic examination	1W	1W	1W	1W
Pipe body and weld	Flattening	As shown in figure 6
SAWL	The body of the pipe	Stretching	1L90	1Т180	1L90	1Т180
Impact strength (CVN)	3Т90	3Т90	3Т90	3Т90
Weld	Stretching	-	1W	-	1W
Impact strength	3W and 6 HAZ		6W and 12 HAZ
Directional bend	2W	2W	2W	2W
Hardness control	1W	1W	1W	1W
Control of macrostructure	1W	1W	1W	1W
SAWH	The body of the pipe	Stretching	1L	1T	1L	1T
Impact strength (CVN)	3T	3T	3T	3T
Weld	Stretching	-	1W	-	1W
Impact strength (CVN)	3W and 6 HAZ		6W and 12 HAZ
Directional bend	2W	2W	2W	2W
Hardness control	1W	1W	1W	1W
Control of macrostructure	1W	1W	1W	1W
Notation used to specify the orientation and location of samples and test specimens, figure 5. The manufacturer has the option to apply a longitudinal sample of a complete section. If agreed, to determine the yield stress in the transverse direction is allowed to use the ring samples tested, the distribution of the hydraulic unit in accordance with the standard [6]. For deepwater pipelines may be provided to conduct additional testing requirements and the frequency of which should be consistent. For a weld bead made by high frequency welding, W means that the notch shall be located on the line of fusion, a HAZ — that the incision should be placed at the line of fusion +2 mm. For the weld made SAW, HAZ means that the notch shall be located on the line of fusion or fusion line +2 mm. On pipes with two longitudinal welds test should be subjected to both pipe seam representing the controlled party. For pipes with a wall thickness of 19.0 mm test samples can be machined to obtain rectangular samples with thickness of 18.0 mm.

When conducting mechanical tests specified in section 9, samples for testing defects in preparation or imperfections unrelated to the purpose of specific mechanical tests, regardless of whether they are identified before the test or after it may be discarded and replaced by other samples from the same tube.

10.3.2.2 Samples for tensile testing

At the manufacturer’s choice of test body tubes can be carried out on samples in the form of a strip or cylindrical sample. Samples for testing should be selected and prepared in accordance with GOST 10006 or standard [6] and as shown in figure 5.

Testing of welds is carried out on cylindrical samples or on samples in the form of a strip.

Samples for testing in the form of a strip needs to represent the whole thickness of the pipe wall. Transverse specimens shall be straightened, the straightening of longitudinal specimens is not allowed. Used to capture the ends of the specimens should be machined before installing the clips in the test set. Rollers welded seams should be ground flush and local imperfections removed.

Cylindrical samples for testing shall be made of nevirapine samples. For pipes with a wall thickness of 19.0 mm diameter cylindrical longitudinal test specimen shall be equal to 12.7 mm. Diameter cylindrical transverse test specimen shall be those specified in table 16, however, the manufacturer can be selected the next larger diameter. For testing of pipes with a diameter of 219.1 mm and the manufacturer can be selected a longitudinal sample of a complete section.


Table 16 — Ratio of pipe sizes and diameters of the transverse cylindrical samples for tensile testing

In millimeters

The outer diameter	Wall thickness
The diameter of the specimen for testing within the estimated length
12,7	8,9	6,4
From of 219.1 up to 273.1	-	From 28,1	To 28.1
From up to 273.1 323.9 m	From 36,1	From a 25.5 to 36.1	To 25.5
From 323.9 m up to 355,6	From 33.5	From of 23.9 to 33.5	To 23.9
From up to 355,6 406,4	From 32,3	From of 23.2 to 32.3	To 23.2
From up to 406,4 457,0	From 30,9	From 22.2 to 30.9	22.2
From to 457,0 508,0	From 29,7	From 21.5 to 29.7	To 21.5
From 508,0 559,0 to	From 28,8	From 21,0 to 28.8	To 21,0
From 559,0 610,0 to	From 28,1	From 20.5 to 28.1	To 20.5
From up to 610,0 660,0	27.5	From of 20.1 to 27.5	To 20.1
From 660,0 711,0 to	From 27,0	From 19.8 to 27,0	To 19.8
From to 711,0 762,0	From 26.5	From 19.5 to 26.5	To 19.5
From 762,0 813,0 to	From 26,2	From 19.3 to 26.2	To 19.3
From 813,0 864,0 to	From 25,8	From 19.1 to 25.8 per	To 19.1
To 864,0 from 914,0	From 25,5	18, 9 to 25.5	To 18.9
From 914,0 to 965,0	From 25,3	18.7 25.3	To 18.7
From 965,0 up to 1016,0	From 25,1	Between 18.6 to 25.1	To 18.6
From 1016,0 to 1067,0	From 24,9	From 18.5 to 24.9	To 18.5
From 1067,0 to 1118,0	From 24,7	From of 18.3 to 24.7	To 18.3
From to 1118,0 1168,0	24.5	From 18.2 to 24.5	To 18.2
From 1168,0 to 1219,0	From 24,4	From of 18.1 to 24.4	To 18.1
From 1219,0 to 1321,0	From 24,2	From 18,1 to 24.2	To 18.1
From 1321,0 to 1422,0	From 24,0	From a 17.9 to 24.0	To 17.9
From 1422,0 to 1524,0	From 23,8	From about 17.8 to 23.8	To 17.8
From 1524,0 to 1626,0	From 23.6	From 17.6 to 23.6	To 17.6
From 1626,0 to 1727,0	From 23,4	From 17.5 to 23.4	To 17.5
From 1727,0 to 1829,0	From 23,3	From 17.4 to 23.3	To 17.4
From 1829,0 to 1930,0	From 23,1	From 17.4 to 23.1	To 17.4
From 1930,0 to 2134,0	From 23,0	From 17.3 to 23.0	To 17.3
From 2134,0	From 22,9	From to 17.2 to 22.9	To 17.2
For pipe sizes, insufficient for the manufacture of specimens for testing with a diameter of 6.4 mm shall not be applicable to cylindrical samples for tensile testing.

If agreed, to determine the yield stress in the transverse direction allowed the use of a ring test specimen on hand.

10.3.2.3 Samples for testing the impact strength V-notch (CVN)

Samples for testing the base metal manufactured in accordance with the standard [7], unless the purchase order is not specified samples according to the standard [6]. The axis of the notch of the specimen should be perpendicular to the pipe surface.

It is not allowed to edit the test material.

The size and orientation of samples for testing must meet the requirements of table 17, in addition to samples of the nearest smaller size, which may be applicable, if the expected job impact exceeds 80% of full scale installation for testing the impact strength.


Table 17 — Ratio of pipe sizes and required samples for testing the impact strength

In millimeters

The outer diameter	Wall thickness
The size and orientation of the sample with a V-shaped incision
full size	¾	2/3	½
From up to 114,3 141,3	From 12,6	From 11.7 to 12.6	From 10,9 to 11,7	From 10.1 to 10.9
From to 141,3 168,3	Of 11.9	From 10.2 to 11.9	From 9.4 to 10.2	From 8.6 to 9.4
From 168,3 to of 219.1	From 11.7	Between 9.3 to 11.7	From 8.6 to 9.3	From 7.6 to 8.6
From of 219.1 up to 273.1	From 11,4	8.9 to 11.4	From 8.1 to 8.9	From 6.5 to 8.1
From up to 273.1 323.9 m	Between 11.3	From 8.7 to 11.3	From 7.9 to 8.7	From 6.2 to 7.9
From 323.9 m up to 355,6	From 11.1	From 8.6 to 11.1	From 7.8 to 8.6	From 6.1 to 7.8
From up to 355,6 406,4	From 11.1	From 8.6 to 11.1	From 7.8 to 8.6	From 6.1 to 7.8
From 406,4	11,0	From 8.5 to 11.0	From 7.7 to 8.5	From 6.0 to 7.7
Samples full size samples of nevirapine perpendicular to the axis of the pipe or weld, whichever is applicable. Samples with size of ¾ nevirapine samples, perpendicular to the axis of the pipe or weld, whichever is applicable. Samples with size 2/3 of nevirapine samples, perpendicular to the axis of the pipe or weld, whichever is applicable. Samples measuring ½ of nevirapine samples, perpendicular to the axis of the pipe or weld, whichever is applicable.

Note — Pipe with a combination of outer diameter and wall thickness specified in table 17 shall be allowed to jeopardise the impact strength (CVN).


Each sample for testing the weld or heat affected zone (HAZ) before performing the incision needs to be subjected to etching in order to perform the incision in the desired location.

The axis of incision on the samples for testing the weld bead from the pipe SAW must be located on the axis of the outer weld bead or as close as possible to this axis.

The axis of the cut samples for tests of heat affected zone (HAZ) on samples from SAW pipes shall be located as close as possible to the edge of the outside weld bead as shown in figure 7.

Figure 7 — location of the axis of incision on the samples for testing the impact strength of the heat affected zone (HAZ)

a Pipe SAW

b — Pipe HFW

1 — axis incision is performed on the sample for testing the weld metal; 2 — axis cut at the line of fusion performed on the sample including 50% weld metal and 50% heat affected zone (HAZ); 3 — axis notch at a distance approximately 2 mm from the fusion line; 4 — axis cut at a distance of approximately 5 mm from the fusion

Note — the Samples for test region of the weld root is taken from pipes with wall thickness more than 25 mm.

Figure 7 — location of the axis of incision on the samples for testing the impact strength of the heat affected zone (HAZ)

10.3.2.4 Samples for testing sent on the bend

Samples for testing sent on the bend should be prepared in accordance with standard [8] or [6] and figure 8.

Figure 8 — Samples for testing sent on the bend

1 long edge is mechanically treated and/or cut off oxygen cutting; 2 — weld; 3 — wall thickness

a Pipe SAW

1 — bent sample with exposed side seam; 2 — reduced wall thickness; 3 — metal, which is removed before or after rectification; 4 — curved specimen with the weld root

Note — Use fixture size, designed for pipes with a wall thickness of 19.0 mm

b — Samples with a reduced wall thickness (optional, for SAW pipe wall thickness 19,0 mm)

Figure 8 — Samples for testing sent on the bend

Samples from pipes with a wall thickness of 19.0 mm and can be machined to obtain a rectangular cross-section with a reduced wall thickness of 18.0 mm. Samples from pipes with a wall thickness of 19.0 mm should represent the full wall thickness with a curved cross section.

For SAW pipe, the weld reinforcement must be removed from both surfaces of the sample.

10.3.2.5 test Samples for flattening

Samples should be prepared in accordance with standard [9], with the exception of the length of the sample for test, which must be not less than 60 mm.

Small surface imperfections can be removed by grinding.

10.3.2.6 Samples for macrostructure control and metallographic control

Samples for control of macrostructure and metallographic controls should be selected from one of the ends of the tube selected for inspection.

Samples should represent all cross section of the longitudinal or spiral seam, with the seam located in the middle of the sample to include the entire area of the weld not less than 15 mm of base metal on each side of the line of fusion.

The cross section of the samples subjected to grinding, polishing and etched to clearly reveal the fusion line and heat affected zone (HAZ).

10.3.2.7 Samples for testing of hardness on the wall thickness

Samples for hardness testing wall thickness must be selected from one of the ends of the pipe selected for testing.

Samples for hardness testing of pipe body should represent a cross-section of the tube wall, to control the hardness of the weld and heat affected zone (HAZ) is the cross section of the longitudinal or helical seam comprising a welded seam and at least 15 mm of the base metal of the welded junctions.

The cross section of the samples subjected to grinding, polishing and etched to clearly reveal the fusion line and heat affected zone (HAZ).