GOST 24890-81
GOST 24890−81 welded Pipes from titanium and titanium alloys. Specifications (with Change No. 1)
GOST 24890−81
Group В64
STATE STANDARD OF THE USSR
WELDED PIPES FROM TITANIUM AND TITANIUM ALLOYS
Specifications
Welded pipes out of titanium and titanium alloys.
Specifications
GST 18 2550
Valid from 01.01.1983
in the part of pipe bands And from
before 01.01.1988*
________________
* Expiration removed according to Protocol
The interstate Council for standardization,
Metrology and certification. (IUS N 2 1993).
Note the «CODE»
Promulgated by the decree of the USSR State Committee on standards of 24 July 1981 N 3517
REPRINTING. April 1982
The Change N 1, approved by the resolution of State standards Committee of the USSR from
Change No. 1 entered the law office of «Code» in the text IUS N 11, 1987
This standard applies to circular welded pipe in titanium grades VT1−00, VT1−0 and titanium alloy grade OT4−0.
1. ASSORTMENT
1.1 Outer diameter, wall thickness and limit deviation and theoretical weight of 1 m of pipes shall be as specified in table. 1.
(Changed edition, Rev. N 1).
1.2. It is possible to produce tubes of intermediate sizes for the external diameter and wall thickness. The maximum deviations are taken as the nearest smaller size.
(Changed edition, Rev. N 1).
1.3. The length of the pipe manufacture:
random lengths from 1.0 to 6.0 m;
gauging and multiple of gauging length within off-gage.
By agreement with the consumer allowed to manufacture pipes of a different size.
1.4. Tolerance on length of pipes lengths and dimensional length must not exceed +15 mm.
1.5. Multiple pipe lengths are made subject to the allowance for each RES +5 mm.
1.6. Theoretical weight of 1 m pipe in titanium grades VT1−00 and VT1−0 is calculated based on nominal diameter and nominal wall thickness with a density of 4.50 g/cm.
To calculate the theoretical linear density of tubes from titanium alloy grade OT4−0, you should use a transfer ratio of 1,011.
Table 1
| External diameter, mm |
Theoretical linear density of 1 m pipe, kg, at wall thickness, mm | ||
| Nomin. | Pred. off. | 1,5±0,15 | 2,0±0,18 |
| 25 | ±0,50 |
0,498 | 0,650 |
| 32 | 0,647 | 0,848 | |
| 38 | ±0,60 | 0,774 | 1,018 |
| 50 |
±0,65 |
- |
1,357 |
| 54 |
1,470 | ||
| 60 |
±0,70 | - | 1,640 |
| 70 | ±1,0 | - | 1,923 |
| 80 |
±1,2 | - | 2,205 |
| 89 | ±1,4 | - | 2,460 |
| 102 | ±1,8 |
- | 2,827 |
Examples of symbols
Pipe grade alloy OT4−0, an outer diameter of 25 mm, a wall thickness of 2.0 mm, random length:
Pipe OT4−0 25x2, GOST 0x 24890−81
However, in the annealed condition (M), a length of a multiple of (CD) 2000 mm:
Pipe OT4−0.M 25x2,0х2000 CD key GOST 24890−81
(Changed edition, Rev. N 1).
2. TECHNICAL REQUIREMENTS
2.1. Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner. Pipe made from titanium grades VT1−00 and BT1−0 and titanium alloy grade OT4−0 with the chemical composition according to GOST 19807−74.
(Changed edition, Rev. N 1).
2.2. Pipe, depending on the quality indicators are made of groups A and B.
Tubes of group A are manufactured in the annealed condition with corroded surface.
Pipe group B produce no heat treatment immediately after welding without etching the surface.
Allowed in pipe manufacturing group B in the annealed condition with surface or etched without etching the surface.
(Changed edition, Rev. N 1).
2.3. Pipe made from strips by continuous argon-arc welding or other welding techniques.
Product mix standard and technical requirements tape must meet regulatory and technical documentation.
(Changed edition, Rev. N 1).
2.4. Mechanical properties of tubes in tension shall be as specified in table. 2.
Table 2
| Mark alloy |
External diameter, mm | Temporary resistance |
Relative |
| VT1−00 |
All sizes |
295−440 (30−45) | 20 |
| VT1−0 | All sizes | 390−590 (40−60) | 15 |
| OT4−0 | All sizes | 490−635 (50−65) | 15 |
(Changed edition, Rev. N 1).
2.5. Surface of the pipe (external and internal) must not have cracks, delamination, cavities, captive, deep scratches, rough marks Stripping and incomplete fusion of the seam.
On the surface of the pipes allowed:
risks, scratches, nicks, dents, traces of stripper and prints, if they’re not output tubes for maximum deviations.
the presence of burrs on the inner surface of the pipe;
the color of the tint in the area of the weld;
transversely circular and spiral traces of processing.
The height of the Burr on the inner surface of pipe bands And should not exceed 0,7 mm.
2.6. Wall thickness in the zone of the weld shall not be less than minimum wall thickness given in table. 1.
2.7. Tubes should be evenly cut and have no burrs.
2.8. Ovality pipe (no weld zone) shall not withdraw their dimensions limit deviations for outer diameter.
2.9. Raznoshennoy pipe (no weld zone) must not display their dimensions for limit deviation for wall thickness.
2.10. The deviation from straightness of a pipe of group A should not exceed 1.5 mm per meter length. The curvature of the pipe B should not exceed 3 mm per meter of pipe length.
(Changed edition, Rev. N 1).
2.11. Tubes shall withstand hydraulic pressure of not less than 4.90 MPa (50 kgf/ cm).
At the request of the consumer pipes shall withstand a hydraulic pressure of not less than of 9.80 MPa (100 kgf/cm).
2.12. The pipes should withstand the test of the distribution on the mandrel, taper 1:10.
The increase of the original diameter should not be less than 10%.
2.13. Pipe shall withstand flattening tests; to the distance between splosives surfaces up to ½ of the original diameter.
2.14. Pipe shall withstand a bend test.
2.15. Pipe group A should stand the test of the turn-up cuffs. The amount of flanging established by agreement between manufacturer and consumer.
3. ACCEPTANCE RULES
3.1. Pipes take by the parties. The party should consist of pipes of the same brand of alloy, one state, one bottoms, one group of the same size and decorated by one document on quality.
Allowed to make a lot of pipes, taken from a few of swimming trunks, provided that each melting meets the requirements of this standard.
The document about quality should contain:
trademark or the name and trademark of manufacturer;
grade and group.
the condition of the material;
the sizes of pipes;
the batch number and melting;
the weight of the party;
the results of the tests;
the number of packing stations;
the designation of this standard.
3.2. To determine the chemical composition select two tubes from the party.
Allowed the manufacturer to determine the chemical composition of the bars: major components for each cast, and impurities — every tenth heat.
The content of other impurities is not subject to control.
(Changed edition, Rev. N 1).
3.3. Checking of outer diameter, wall thickness and curvature is carried out on each tube.
3.4. Quality check outer surfaces subjected every pipe.
3.5. Quality control is subjected to the inner surface of one tube from the party.
3.6. To check mechanical properties of selected 2% of the pipes, but at least two pipes from the party.
3.7. Check for leaks and the quality of the weld is subjected to each pipe. Quality assurance of a welded seam of pipe bands And non-destructive methods are subjected to each tube, to check for leaks take away 2% of the pipes, but at least two pipes from the party.
3.8. Control on the distribution and flattening is carried out on 2% of the pipes, but not less than two pipes of the party.
3.9. Control on the bend is carried out on 2% of the pipes, but not less than two pipes. Control on a bend, the manufacturer is conducting at the request of the consumer.
3.10. Control at turn-up cuffs hold 2% of the pipe, but not less than two pipes. Control at turn-up cuffs, the manufacturer is conducting at the request of the consumer.
(Paragraphs 3.9, 3.10. Changed the wording, Rev. N 1).
3.11. If unsatisfactory test results of the sample inspection of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch.
The results of repeated tests apply to the entire party.
Allowed the manufacturer upon receipt of unsatisfactory results of re-inspections routine inspection of the tubes.
(Changed edition, Rev. N 1).
4. TEST METHODS
4.1. Selection and preparation of samples for determining the chemical composition of the pipes is carried out according to GOST 24231−80.
Determination of the chemical composition of titanium and titanium alloys is carried out according to GOST 25086−81, GOST 19863.1−80 — GOST 19863.13−80 or the spectral method according to GOST 23902−79, or other method of equal precision standard.
In case of any disagreement, the chemical composition is determined by GOST 25086−81, GOST 19863.1−80 — GOST 19863.13−80.
(Changed edition, Rev. N 1).
4.2. Measurement of pipes the outside diameter and wall thickness is carried out with a micrometer according to GOST 6507−78 type MT or other tool, to ensure the necessary measurement accuracy. The wall thickness control is carried out from both ends of the pipe.
The length of the tubes test tape according to GOST 7502−80 or metal ruler according to GOST 427−75.
4.3. The deviation from straightness of a pipe test in the following way: the pipe is placed on a test plate according to normative-technical documentation, put a metal ruler measuring length of 1 m according to GOST 427−75 and using the probes according to GOST 882−75 measure the maximum distance between the line and the pipe according to GOST 26877−86.
Allowed to use other methods and measuring tools that provide required accuracy.
If there is discrepancy deviation from straightness is determined according to GOST 26877−86.
(Changed edition, Rev. N 1).
4.4. The test surface of the pipe is carried out by visual inspection without the use of magnifying devices.
Check the inner surface is carried out by visual inspection of the illuminated screen.
4.5. Testing of mechanical properties carried out according to GOST 10006−80.
To check the mechanical properties of each check the pipe in the longitudinal direction, cut one sample.
Selection and cutting of specimens is carried out outside the heat affected zone of the weld.
The estimated length of the sample set according to the formula:
The speed of movement of the grippers (no-load machine) needs to be 10−15 mm/min.
The selection and preparation of samples for tensile tests carried out according to GOST 24047−80 or GOST 10006−80.
(Changed edition, Rev. N 1).
4.6. The leakproofness test and the quality of the weld is carried out by hydraulic pressure GOST 3845−75.
4.7. Quality assurance of a welded seam of pipes of the group And carried out x-ray method according to the method of the manufacturer.
(Changed edition, Rev. N 1).
4.8. Test flattening is carried out in cold condition according to GOST 8695−75.
4.9. Test distribution is carried out in cold condition according to GOST 8694−75.
4.10. The test bend is carried out according to GOST 3728−78 on the mandrel. The value of the exchange of the mandrel is determined by agreement between manufacturer and consumer. From each monitored pipe take one sample.
(Changed edition, Rev. N 1).
4.11. Test turn-up cuffs is carried out according to GOST 8693−80.
(Changed edition, Rev. N 1).
5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. Each tube with external diameter up to 35 mm at a distance of not more than 50 mm from one end must be the paint caused the seal of the Department of technical control of the manufacturer.
Each tube with outer diameter more than 35 mm at a distance of not more than 50 mm from one end should be hammering method caused the seal of the Department of technical control of the manufacturer.
Pets instead of marking marking paint or stick on a label.
5.2. The pipe is laid in bundles, consisting of tubes of the same size, the same brand of alloy, and one material state.
Bundles of tubes associated soft steel strip with thickness 0.3−0.5 mm and width up to 20 mm according to GOST 3560−73, GOST 6009−74 or wire with a diameter of 5 mm according to GOST 3282−74, OST 14−15−193−86 not less than two places when the length of the pipe up to 3 m inclusive, and in three to five places the length of the pipe more than 3 m
The ends of the ribbon when tying to connect by using locks.
A ligament wire held not less than 2−3 turns with tight akruthi all.
The mass of the beam should not exceed 500 kg.
Allowed linking of bundles of tubes with length up to 3 m in a single piece of cargo weighing not more than 1000 kg.
5.2.1. When you send the pipes in the far North and remote areas of the packaging must meet the requirements of GOST 15846−79.
5.3. To each associated beam pipes attached label with indication of alloy grades, the condition of the material and size of tubes, batch number or trunks, the weight of the beam and the mark of the technical control Department of the manufacturer.
5.4. Transport marking of packages — according to GOST 14192−77 with the indication:
name of the material;
grade alloy;
batch number.
5.5. Pipe transporterowych by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.
5.5.1. The placement and fastening of cargo in rail vehicles must be conducted in accordance with the conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.
(Paragraphs 5.2
5.6. Pipes shall be stored in covered warehouses protected from mechanical damage and action of active chemical reagents.
