GOST R ISO 10893-5-2016
GOST R ISO 10893−5-2016 seamless steel Tubes and welded. Part 5. Magnetic particle inspection of pipes of ferromagnetic steel for the detection of surface defects
GOST R ISO 10893−5-2016
NATIONAL STANDARD OF THE RUSSIAN FEDERATION
SEAMLESS STEEL TUBES AND WELDED
Part 5
Magnetic particle inspection of pipes of ferromagnetic steel for the detection of surface defects
Seamless and welded steel tubes. Part 5. Magnetic particle inspection of ferromagnetic steel tubes for the detection of surface imperfections
OKS 23.040.10
77.040.20
77.140.75
Date of introduction 2016−11−01
Preface
1 PREPARED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders», non-state educational institution of additional professional education «Scientific-training center «testing and diagnostics» («RTC «testing and diagnostics») and Open joint stock company «Russian scientific research Institute of pipe industry» (JSC «RosNITI») on the basis of the official translation into Russian language of the English version specified in paragraph 4 of the international standard, which is the Federal state unitary enterprise «Russian scientific and technical centre of information on standardization, Metrology and conformity assessment (FGUP «STANDARTINFORM»)
2 SUBMITTED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders"
3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology dated March 16, 2016 N 146-St
4 this standard is identical to international standard ISO 10893−5:2011* «non-destructive testing of steel tubes. Part 5. Method of magnetic particle inspection of seamless and welded pipes made of ferromagnetic steel for the detection of surface defects» («Non-destructive testing of steel tubes — Part 5: Magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface imperfections», IDT).
An international standard developed by ISO Technical Committee ISO/TC 17 «Steel», Subcommittee SC 19 «Technical delivery conditions for pipes working under pressure».
The name of this standard changed with respect to names specified international standard to link with the names adopted in the current national set of standards.
In applying this standard it is recommended to use instead of the referenced international standards corresponding national standards of the Russian Federation and interstate standards, details of which are given in Appendix YES
5 INTRODUCED FOR THE FIRST TIME
Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) 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 index «National standards».
Introduction
International standard ISO 10893−5 cancels and replaces the technically revised ISO 13664−1997 and ISO 13665:1997.
In the complex of ISO 10893 under the name «non-destructive testing of steel tubes» includes:
— part 1. Automatic electromagnetic inspection of steel seamless and welded tubes (except tubes produced by arc welding under flux) for verification of the tightness;
— part 2. Automatic inspection eddy current seamless and welded steel pipes (excluding pipes obtained by arc welding under flux) for detection of defects;
— part 3. Automatic control method of magnetic flux leakage around the entire circumference of seamless and welded pipes made of ferromagnetic steel (except tubes produced by arc welding under flux) for the detection of longitudinal and/or transverse defects;
— part 4. The control method of penetrating liquids seamless and welded steel tubes for the detection of surface defects;
— part 5. Control method of magnetic particles seamless and welded pipes made of ferromagnetic steel for detecting surface defects;
— part 6. Radiographic testing of the weld of welded steel tubes for detection of defects;
— part 7. Digital radiographic testing of the weld of welded steel tubes for detection of defects;
— part 8. Automatic ultrasonic testing of seamless and welded steel tubes for detection of laminar defects;
— part 9. Automatic ultrasonic testing for the detection of laminar imperfections in strip/plate used for the manufacture of welded steel pipes;
— part 10. Automatic ultrasonic testing along the whole circumference of seamless and welded steel pipes (excluding pipes obtained by arc welding under flux) for the detection of longitudinal and/or transverse defects;
— part 11. Automatic ultrasonic testing of the weld of welded steel tubes for the detection of longitudinal and/or transverse defects;
— part 12. Automatic ultrasonic control of thickness around the circumference of seamless and welded steel pipes (excluding pipes obtained by arc welding under flux).
1 Scope
This standard specifies requirements for magnetic particle testing of seamless and welded pipes made of ferromagnetic steel for detection of surface defects in the pipe body, end faces and chamfers.
For the control of pipe body established requirements for determining surface defects on the outer surface of the pipe or its parts. However, by agreement between the purchaser and the manufacturer may control the inner surface of limited length dependent on pipe diameter, at the ends of the pipes.
Also this standard is applied to determine the location of defects on the outer surface of the pipe, discovered another method of non-destructive testing (e.g. ultrasonic) prior to cleaning the surface of the pipe, and also to guarantee complete removal of the defect after Stripping.
On the ends (facets) pipes this standard specifies requirements for the detection of delaminations that may impede further the production and acceptance control (e.g. welding and ultrasonic inspection of welded joints). This standard is suitable for the detection of other defects, except bundles at the ends and bevels pipes. In this case, the magnetic field should be perpendicular to the orientation characteristic of the defect.
This standard can be applied for control of the hollow profile.
2 Normative references
For the application of this standard requires the following referenced documents are*. For undated references, use the latest edition of the referenced document, including all changes:
ISO 9712 non-destructive testing. Qualification and certification of personnel (ISO 9712 Non-destructive testing — Qualification and certification of personnel)
ISO 9934−1 non-destructive Control. Test with magnetic particles. Part 1. General principles (ISO 9934−1 Non-destructive testing — Magnetic particle testing — Part 1: General principles)
ISO 9934−2 non-destructive Control. Test with magnetic particles. Part 2. Means for detecting (ISO 9934−2 Non-destructive testing — Magnetic particle testing — Part 2: Detection media)
ISO 9934−3 non-destructive Control. Test with magnetic particles. Part 3. Equipment (ISO 9934−3 Non-destructive testing — Magnetic particle testing — 3: Equipment)
ISO 10893−8 non-destructive testing of steel tubes. Part 8. Automatic ultrasonic testing of seamless and welded steel tubes for detection of defects of delamination (ISO 10893−8 Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminarim perfections)
ISO 11484 steel Products. The system of training for the employer personnel for non-destructive testing (ISO 11484 Steel products — Employer''s qualification system for non-destructive testing (NDT) personnel)
3 Terms and definitions
This standard applies the terminology of ISO 9934−1 and ISO 11484 and the following terms with respective definitions:
3.1 pipe (tube) Hollow long product, open at both ends, of any shape in cross section.
3.2 seamless pipe (seamless tube): Tube, fabricated by sewing of the solid billet to obtain a hollow pipe in which they are further processed (hot or cold) to its final dimensions.
3.3 welded tube (welded tube): Pipe manufactured by forming a hollow profile from a flat product and welding adjacent edges together, and which after welding can be further processed (hot or cold) to its final dimensions.
3.4 the manufacturer (manufacturer): Organization that manufactures products in accordance with the relevant standards and States the conformity of the delivered products with all applicable provisions of the relevant standard.
3.5 agreement (agreement): a Contractual relationship between the manufacturer and the customer at the time of enquiry and order.
4 General requirements
4.1 If the specification for the products or the agreement between the customer and the manufacturer do not stipulate otherwise, the magnetic particle inspection should be carried out on tubes after completion of all primary technological operations of production (rolling, heat treatment, cold and hot deformation, processing size, pre-edits, etc.).
4.2 pipe Surface, end faces and chamfers both ends of the controlled tubes should be free of oil, grease, sand, scale or any other substances that may affect the interpretation of indications obtained in the process of conducting a magnetic particle inspection. Type of indications, as well as the minimum size of detected surface defects depends on the production technology of pipes and surface quality.
4.3 Control should only be undertaken by trained operators, qualified in accordance with ISO 9712, ISO 11484 or equivalent documents and under the supervision of competent personnel appointed by the manufacturer (the manufacturer). In case of inspection by a third party this must be agreed between the purchaser and the manufacturer. Control by permission of the employer must be conducted in accordance with written procedure. The procedure of nondestructive testing must be coordinated by a specialist 3 level, and personally approved by the employer.
Note — the Definition of levels 1, 2 and 3 to watch in relevant international standards, e.g. ISO 9712 and ISO 11484.
5 control Technology
5.1 General provisions
5.1.1 Zone of control (pipe body or surface of the end (chamfer)) and the direction of magnetization (longitudinal or transverse) must comply with the specifications for the products or ordering.
5.1.2 the Outer surface of each pipe or part in accordance with the requirements, should be controlled by the magnetic particle method for the detection of longitudinal and (or) transverse surface defects with the use of magnetization is variable or constant magnetic field depending on the chosen method of magnetic particle inspection. When the control ends (chamfer) the application of dry magnetic powder is acceptable only by prior agreement of the customer and the manufacturer. Otherwise, should apply the requirements of ISO 9934−1, ISO 9934−2 and ISO 9934−3.
5.1.3 For the detection of surface defects the indicator must be applied simultaneously with the applied magnetic field at an illumination of not less than 500 Lux.
The use of the residual magnetization, i.e. the application of a magnetic powder after the magnetization of the pipe is allowed only after prior agreement between the manufacturer and the customer, but it is not recommended to control the ends (facets).
With insufficient sensitivity, such as in the case of insufficient contrast between the indicator and the surface of the testing pipe or as a result of the chosen method of magnetization on the surface of the pipe before the control needs to be applied to the white base (primer) to improve contrast. Alternatively must be carried out with the use of fluorescent powder in a dark room using a source of UV radiation type A (UV-A) light level natural light not exceeding 20 Lux and a radiation intensity of at least 10 W/m.
5.1.4 this standard does not specify requirements for the values of the magnetization and the current required to generate the value of magnetization required for detection of unacceptable surface defects. However, in all cases the magnetization depending on the display environment is set (except as indicated in 5.1.2) in accordance with ISO 9934−1, ISO 9934−2 and ISO 9934−3.
5.1.5 In the process of monitoring tubes the level of magnetization established by the adopted method and equipment shall be inspected at intervals of time not exceeding 4 hours, for example, using the measurement of the magnetic field. When the control ends (bevels), to demonstrate the possibility of detecting defects can be used by adjusting the sample-tube containing either artificial defect, or a natural bundle on the end (chamfer).
5.2 Control of pipe body
5.2.1 Basic provisions
When you control the pipe body of the magnetic field must be applied along the circumference for the detection of longitudinal surface defects or parallel to the pipe axis for the detection of transverse surface defects.
5.2.2 Methods of magnetization
To control the pipe body shall apply one of the following methods of magnetization:
a) Method a — current on the part of the object (circular magnetization)
The transmission obtained with the external DC, AC, rectified or half-wave rectified alternating current between the two contacts on the surface of the pipe. This method is designed to detect defects which are oriented mainly parallel to the axis of the pipe.
b) the Way In is to pass current through a conductor placed in a through hole in the object (circular magnetization)
Current (as in method A) is ignored by rigid or flexible cable located inside the pipe along the axis. This method (as method A) is designed to detect defects which are oriented mainly parallel to the axis of the pipe.
c) Method — with the help of a solenoid (longitudinal (pin) the magnetization)
Rigid or semi-rigid conductive coil is wound around the pipe and magnetizes the surface of the pipe in a direction parallel to the axis of the tube, allowing to detect defects, oriented mainly perpendicular to the pipe axis.
d) Method D — method of magnetic flux
The magnetic flux received from an external power source (as in method A), flows through the pipe body or parts of it. This method is designed to detect defects perpendicular to the imaginary line connecting the poles of the electromagnet.
Other methods of magnetization that are not specified in 5.2.2, enum a)-d), or a combination thereof, may apply if meet the requirements of the tension and direction of the magnetic field.
5.3 Control end (chamfer)
5.3.1 During the inspection ends (chamfer) at both ends of the pipe magnetization at the discretion of the manufacturer should be either parallel to the pipe axis, or across the tube wall. At the same time should be applied the indicator on the ends (chamfer) for the detection of delaminations.
5.3.2 If you are using a magnetization parallel to the axis of the pipe, then apply rigid concentric winding around or inside the tube, located close to the end of the pipe. Food revolution should be provided with half-wave or rectified alternating current or direct current source. In this case you should check on the measuring device that generates the magnetizing current in the pipe wall of magnetic field perpendicular to the surface of the pipe at the ends.
Alternatively, the method of carrying current can be carried out through the contacts established at the end of the pipe by 180° around the circumference. After the control contacts should be rotated 90° relative to the initial position and repeating the control. In this case, only by agreement between the purchaser and the manufacturer are permitted to carry out control using the residual magnetization and fluorescent powder.
5.3.3 When the magnetic field is applied across the wall on the pipe ends, the magnetization is performed by yoke on AC or DC. The pole pieces are located radially between the inner and outer surfaces of the pipe through the wall thickness of the tube at the ends. Upon agreement between the purchaser and the manufacturer, use a permanent magnet of sufficient power. Can also be used other methods of radial magnetization, if the manufacturer can demonstrate their equivalence stated above.
6 Classification of the indications
6.1 the Main provisions of the
Monitoring should be performed visually without magnification.
Indirect inspection, for example with the use of a camera, is possible only if the manufacturer can demonstrate that this does not affect acceptance criteria.
6.2 specific requirements the classification of defects in the pipe body
Magnetic particle inspection to determine the nature, shape, orientation, and specifically the depth of the detected surface defects. Flat pattern does not determine the actual sizes of the surface defects that caused these indications. Therefore, when magnetic powder control should apply the following classification (evaluation) of indications:
a) extended indication — indication whose length is three or more times longer than wide;
b) a rounded indication — indication which is circular or oval shape, the length indication exceeds the width less than 3 times;
c) the congestion indications — the-line or display groups, consisting of at least three indications, which can be long and rounded, and the distance between them does not exceed the length of the smallest indication;
d) false indication — indication which have arisen either as a result of local surface irregularities, or certain technological processes in the production of pipes, for example risks as a result of calibration or corrections.
The minimum size of the indications that must be considered in assessing the results of control and levels of acceptance are shown in table 1.
