Assortment of steel pipes 10705 80
Ripples, nicks, dents, small risks, a layer of scale and traces of stripping are allowed provided that they do not take the wall thickness and pipe diameter beyond the maximum deviations. Edge displacement up to 10% of the nominal wall thickness is allowed.
The surface of pipes heat-treated in a protective atmosphere must be free of scale. The presence of an oxide film is allowed.
Lack of penetration of seams must be welded, the place of welding is cleaned. By agreement with the consumer, on pipes with a diameter of 159 mm or more, in places where welds are repaired by welding, the offset of the welded edges is allowed no more than 20% of the nominal wall thickness and the height of the reinforcement bead is not more than 2.5 mm.
Repair by welding of the main metal of pipes is not allowed.
In the case of repair by welding of pipes that have undergone heat treatment, they are subjected to repeated heat treatment (respectively, over the entire volume or over the welded joint).
2.7. On pipes with a diameter of 57 mm or more, one transverse seam is allowed.
By agreement between the manufacturer and the consumer, one transverse seam is allowed on pipes with a diameter of less than 57 mm.
2.8. The outer burr on the pipes must be removed. At the place of deburring, the wall may be thinned by 0.1 mm in excess of the minus tolerance.
At the request of the consumer, on pipes with an internal diameter of 33 mm or more, the internal burr must be partially removed or flattened, while the height of the burr or its traces should not exceed 0.35 mm - with a wall thickness of less than 2 mm; 0.4 mm - with a wall thickness of 2 to 3 mm; 0.5 mm - with a wall thickness of more than 3 mm.
The height of the internal burr or its traces for pipes with an internal diameter of less than 33 mm is set by agreement between the manufacturer and the consumer.
2.9. Pipe ends must be square cut and deburred. The formation of a chamfer is allowed. The oblique cut for pipes with a diameter of up to 219 mm should not exceed 1 mm, and for pipes with a diameter of 219 mm or more - 1.5 mm. By agreement between the manufacturer and the consumer, the pipes are made cut into the lines of the mill.
2.10. At the request of the consumer, the ends of pipes with a wall thickness of 5 mm or more must be chamfered at an angle of 25-30 ° to the end of the pipe and an end ring 1.8 mm ± 0.8 mm wide should be left. By agreement between the manufacturer and the consumer, the bevel angle and the width of the end ring can be changed.
2.11. Pipes must withstand the test hydraulic pressure. Depending on the magnitude of the test pressure, pipes are divided into two types:
- pipes with a diameter of up to 102 mm - test pressure 6.0 MPa (60 kgf / cm2) and pipes with a diameter of 102 mm or more - test pressure 3.0 MPa (30 kgf / cm2);
- pipes of groups A and B, supplied at the request of the consumer with a test hydraulic pressure calculated in accordance with GOST 3845-75, with an allowable stress equal to 90% of the standard yield strength for pipes made of this steel grade, but not exceeding 20 MPa (200 kgf / cm2).
2.12. Heat-treated pipes made of steel grades St3sp, St3ps (categories 3-5), 10, 15 and 20 with a wall thickness of at least 6 mm must withstand the impact bending test of the base metal. In this case, the norms of impact strength must correspond to those indicated in Table. four.
Pipes are steel electrowelded.
Specifications (with Amendments N 1-8)
GOST 10705-80
Group B62
INTERSTATE STANDARD
ELECTRIC WELDED STEEL PIPES
Specifications
electrically welded steel tubes. Specifications
ISS 23.040.10
OKP 13 7300
13 8100
13 8300
Introduction date 1982-01-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
2. APPROVED AND PUT INTO EFFECT by Decree of the USSR State Committee for Standards dated December 25, 1980 N 5970
Change No. 5 was adopted by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 13 dated May 28, 1998) Registered by the Technical Secretariat of the IGU No. 3166 The following voted for the change:
3. REPLACE GOST 10705-63
4. REFERENCED REGULATORY DOCUMENTS
Reference designation | Item number |
GOST 162-90 | 4.4 |
GOST 166-89 | 4.4 |
* | 2.2 |
* See notes of FSUE "STANDARTINFORM" | |
GOST 427-75 | 4.4 |
2.2 | |
GOST 2015-84 | 4.4 |
4.4 | |
2.16; 4.10 | |
2.11; 3.3a; 4.13 | |
4.4 | |
4.4 | |
GOST 6996-66 | 4.12 |
GOST 7268 | 4.6 |
4.4 | |
4.2 | |
4.4 | |
GOST 8693-80 | 4.11 |
4.9 | |
4.8 | |
GOST 9045-93 | 2.2 |
GOST 9454-78 | 4.5 |
4.7 | |
3.1, 5.1 | |
1.1 | |
4.4 | |
4.2 | |
GOST 12345-2001 | 4.2 |
GOST 12346-78 | 4.2 |
GOST 12347-77 | 4.2 |
GOST 12348-78 | 4.2 |
GOST 12349-83 | 4.2 |
GOST 12350-78 | 4.2 |
GOST 12351-2003 | 4.2 |
GOST 12352-81 | 4.2 |
GOST 12353-78 | 4.2 |
GOST 12354-81 | 4.2 |
2.2 | |
GOST 14810-69 | 4.4 |
2.2 | |
GOST 18242-72*, ** | 3.3 |
* Within the territory of Russian Federation valid GOST R ISO 2859-1-2007; ** See notes of FSUE "STANDARTINFORM". |
|
(ISO 4950-2-81, ISO 4950-3-81, ISO 4951-79, ISO 4995-78, ISO 4996-78, ISO 5952-83) | 2.2 |
4.2 | |
4.2 | |
4.2 | |
4.2 | |
4.2 | |
4.2 | |
4.2 |
(Changed edition, Rev. N 6, 7).
5. The limitation of the validity period was removed by the Decree of the State Standard of July 12, 1991 N 1247
6. EDITION (November 2005) with Amendments Nos. 1, 2, 3, 4, 5 approved in December 1986, December 1987, June 1989, July 1991, April 1999 (IUS 2-87, 3-88, 10-89, 10-91, 7-99); Amendment (IUS 5-2005)
Reissue (as of March 2008).
INTRODUCED: Amendment N 6, put into effect on the territory of the Russian Federation from 09/01/2010 by Order of Rosstandart dated 06/17/2010 N 95-st; Amendment No. 7, adopted by the Interstate Council for Standardization, Metrology and Certification by correspondence (Minutes No. 39 dated May 12, 2011). State-developer Ukraine. By order of Rosstandart dated December 22, 2011 N 1577-st, it was put into effect on the territory of the Russian Federation from October 1, 2012; Change N 8, approved and put into effect by the Order of Rosstandart dated February 18, 2015 N 97-st from 09/01/2015
Changes N 6, 7, 8 were made by the database manufacturer according to the text of IUS N 9, 2010, IUS N 3, 2012, IUS N 6, 2015
This standard applies to steel electric-welded longitudinal pipes with a diameter of 10 to 630 mm from carbon and low-alloy steel grades used for pipelines, structures, and products for various purposes.
The standard does not apply to steel pipes used for the manufacture of thermal electric heaters.
(Changed edition, Rev. N 5, 7).
1. ASSORTMENT
1.1. Dimensions and maximum deviations of pipes must comply.
2. TECHNICAL REQUIREMENTS
2.1. Steel electric-welded pipes are manufactured in accordance with the requirements of this standard and according to technical regulations approved in the prescribed manner.
2.2. Depending on the quality indicators, pipes are manufactured in the following groups:
- A - with normalization of mechanical properties
- B - with normalization chemical composition:
- from calm, semi-calm and boiling steel grades St1, St2, St3, St4 according to GOST 380;
- B - with standardization of mechanical properties and chemical composition:
- from calm, semi-calm and boiling steel grades St1, St2, St3, St4 according to GOST 380;
- from calm, semi-calm and boiling steel grades 08, 10, 15, 20 according to GOST 1050;
- from steel grade 08Yu according to GOST 9045;
- from low-alloy steel grade 22GU with a chemical composition according to table 1a (pipes with a diameter of 114 to 630 mm inclusive);
- from low-alloy steel grades according to and others regulatory documents with a normalized carbon equivalent of not more than 0.46% (pipes with a diameter of 114 to 630 mm inclusive);
- D - with standardization of test hydraulic pressure.
Pipes are made from rolled metal according to (categories 1-5), (category 4), GOST 9045, and other regulatory documents approved in the prescribed manner.
Table 1a
(Changed edition, Rev. N 5, 6, 7).
2.3. Pipes made of carbon steel grades are produced heat-treated (over the entire volume of the pipe or along a welded joint), hot-reduced or without heat treatment. Pipes from steel grade St1 are produced without heat treatment.
Pipes from low-alloy steel grades are produced heat-treated (throughout the entire volume of the pipe or along the welded joint) or without heat treatment.
The type of heat treatment is chosen by the manufacturer. By agreement between the manufacturer and the customer, the pipes are thermally treated in a protective atmosphere.
2.4. The mechanical properties of the base metal of heat-treated and hot-reduced pipes of groups A and B from carbon and low-alloy steels must comply with the standards specified in Table 1. The mechanical properties of the base metal of heat-treated pipes of groups A and B from steel grade 22GU are established by agreement between the manufacturer and the customer.
Table 1
steel grade | σ in, H/mm² (kgf/mm²) | Yield strength σ t, H/mm²(kgf/mm²) | Relative extension δ5, % |
at least | |||
08Yu | 255(26) | 174(18) | 30 |
08kp | 294(30) | 174(18) | 27 |
08, 08ps, 10kp | 314(32) | 196(20) | 25 |
10, 10ps, 15kp, St2sp, St2ps, St2kp | 333(34) | 206(21) | 24 |
15, 15ps, 20kp, St3sp, St3ps, St3kp | 372(38) | 225(23) | 22 |
20, 20ps, St4sp, St4ps, St4kp | 412(42) | 245(25) | 21 |
20F, 20-CSH, 06GB | 470 (48) | 294 (30,0) | 20,0 |
490 (50) | 343 (35,0) | 20,0 |
Note. At the request of the customer, pipes with a wall thickness of 4 mm or more from steel grades St3ps, 15, 15ps are manufactured with a yield strength of 235 H / mm² (24 kgf / mm²), relative elongation of 23%; from steel grades St4sp, 20, 20ps - with a yield strength of 255 H / mm² (26 kgf / mm²), relative elongation of 22%.
(Changed edition, Rev. N 5, 6, 8).
2.5. The mechanical properties of the base metal of pipes of groups A and B without heat treatment and with heat treatment of a welded joint with a diameter of 10 to 152 mm inclusive must comply with the standards specified in Table 2, with a diameter of more than 152 to 630 mm inclusive - the standards specified in Table 3 .
table 2
steel grade | Tensile strength σ in, H/mm² (kgf/mm²), with pipe outer diameter D, mm | Yield strength σ t, H/mm²(kgf/mm²) | Relative extension δ5, %, with the outer diameter of the pipes D, mm | ||||
10 to 19 | St. 19 to 60 | St. 60 to 152 | from 10 to 60 for wall thickness | St. 60 to 152 | |||
over 0.06 D | 0,06D and less | ||||||
at least | |||||||
08Yu | 314(32) | 294(30) | 264(27) | 176(18) | 7 | 16 | 25 |
08ps, 08kpSt1ps, St1kp | 372(38) | 314(32) | 294(30) | 176(18) | 6 | 15 | 23 |
08, St1sp | 372(38) | 314(32) | 294(30) | 186(19) | 6 | 15 | 23 |
10kp, St2kp | 372(38) | 333(34) | 314(32) | 176(18) | 6 | 15 | 23 |
10ps, St2ps | 372(38) | 333(34) | 314(32) | 186(19) | 6 | 15 | 23 |
10, St2sp | 372(38) | 333(34) | 314(32) | 196(20) | 6 | 15 | 23 |
15kp | 441(45) | 372(38) | 353(36) | 186(19) | 5 | 14 | 21 |
15ps, 20kp | 441(45) | 372(38) | 353(36) | 196(20) | 5 | 14 | 21 |
15, 20ps | 441(45) | 372(38) | 353(36) | 206(21) | 5 | 14 | 21 |
441(45) | 372(38) | 353(36) | 216(22) | 5 | 14 | 21 | |
St3kp | 441(45) | 392(40) | 372(38) | 196(20) | 5 | 13 | 20 |
St3ps | 441(45) | 392(40) | 372(38) | 206(21) | 5 | 13 | 20 |
St3sp | 441(45) | 392(40) | 372(38) | 216(22) | 5 | 13 | 20 |
St4kp, St4ps | 490(50) | 431(44) | 412(42) | 216(22) | 4 | 11 | 19 |
St4sp | 490(50) | 431(44) | 412(42) | 225(23) | 4 | 11 | 19 |
22GU | - | - | 490(50) | 344(35) | - | - | 15 |
20F, 20-CSH, 06GB | - | - | 470 (48) | 265 (27) | - | - | 18 |
09G2S, 09GSF, 13HFA, 17GS, 17G1S, 17G1S-U, 08HMFCHA, 22GF, 26HMA | - | - | 490 (50) | 323 (33) | - | - | 18 |
Note. At the request of the customer, for pipes of all grades of steel with a diameter of 10 to 60 mm, the relative elongation is increased by 3% compared with the standards given in Table 2.
Table 3
steel grade | Wall thickness, mm | Tensile strength σ in, H/mm² (kgf/mm²) | Yield strength σ t, H/mm² (kgf/mm²) | Relative extension δ5, %, with pipe diameter D, mm | ||
St. 152 to 244.4 | St. 244.5 to 377 | St. 377 to 630 | ||||
at least | ||||||
08, 08ps, 08kp | 6 or less | - | - | 18 | 20 | 20 |
10, 10ps, 10kp, St2kp | More than 6 | 314(32) | 196(20) | 15 | 15 | 16 |
St2sp, St2ps | 6 or less | - | - | 17 | 18 | 20 |
More than 6 | 333(34) | 206(21) | 14 | 14 | 15 | |
15, 15ps, 15kp, 20, 20ps, 20kp | 6 or less | 353(36) | 216(22) | 17 | 18 | 20 |
More than 6 | 14 | 14 | 15 | |||
St3ps, St3ps, St3kp | 6 or less | 353(36) | 216(22) | 17 | 17 | 19 |
More than 6 | 14 | 14 | 14 | |||
St4ps, St4ps, St4kp | 6 or less | 402(41) | 225(23) | 15 | 17 | 18 |
More than 6 | 11 | 12 | 13 | |||
22GU | All thicknesses | 490(50) | 344(35) | 15 | 15 | 15 |
20F, 20-CSH, 06GB | All thicknesses | 470 (48) | 265 (27) | 18 | 18 | 18 |
09G2S, 09GSF, 13HFA, 13GS, 17GS, 17G1S, 17G1S-U, 08HMFCHA, 22GF, 26HMA | All thicknesses | 490 (50) | 323 (33) | 18 | 18 | 18 |
13G1S-U | All thicknesses | 540 (55) | 373 (38) | 18 | 18 | 18 |
(Changed edition, Rev. N 5, 6, 7, 8).
2.6. Cracks, captivity, sunsets, flaws and risks are not allowed on the pipe surface.
Ripples, nicks, dents, small risks, a layer of scale and traces of stripping are allowed provided that they do not take the wall thickness and pipe diameter beyond the maximum deviations. Edge displacement up to 10% of the nominal wall thickness is allowed.
The surface of pipes heat-treated in a protective atmosphere must be free of scale. The presence of an oxide film is allowed.
Lack of penetration of seams must be welded, the place of welding is cleaned. By agreement with the customer, on pipes with a diameter of 159 mm or more, in places where welds are repaired by welding, the offset of the welded edges is allowed no more than 20% of the nominal wall thickness and the height of the reinforcement bead is not more than 2.5 mm.
Repair by welding of the base metal of pipes is not allowed. In the case of repair by welding of pipes that have undergone heat treatment, they are subjected to repeated heat treatment (respectively, over the entire volume or over the welded joint).
2.7. On pipes with a diameter of 57 mm or more, one transverse seam is allowed. By agreement between the manufacturer and the customer, one transverse seam is allowed on pipes with a diameter of less than 57 mm.
2.6, 2.7.
2.8. The outer burr on the pipes must be removed. In the place where the flash is removed, the wall may be thinned by 0.1 mm above the minus tolerance. At the request of the customer, on pipes with an internal diameter of 33 mm or more, the internal flash must be partially removed or flattened, while the height of the flash or its traces should not exceed 0.35 mm - with a wall thickness of less than 2 mm; 0.4 mm - with a wall thickness of 2 to 3 mm; 0.5 mm - with a wall thickness of more than 3 mm.
The height of the internal burr or its traces for pipes with an internal diameter of less than 33 mm is set by agreement between the manufacturer and the customer.
(Changed edition, Rev. N 1, 3, 8).
2.9. Pipe ends must be square cut and deburred. The formation of a chamfer is allowed. The oblique cut for pipes with a diameter of up to 219 mm should not exceed 1.0 mm, with a diameter from 219 to 426 mm inclusive - 1.5 mm, with a diameter of more than 426 mm - 2.0 mm. By agreement between the manufacturer and the customer, the pipes are made cut in the line of the mill.
2.10. At the request of the customer, at the ends of pipes with a wall thickness of 5 mm or more, a chamfer should be chamfered at an angle of 25-30 ° to the end of the pipe and an end ring with a width of (1.8 ± 0.8) mm should be left. By agreement between the manufacturer and the customer, the bevel angle and the width of the end ring can be changed.
2.11. Pipes must withstand the test hydraulic pressure. Depending on the magnitude of the test pressure, pipes are divided into two types:
- I - pipes with a diameter of up to 102 mm - test pressure 6.0 MPa (60 kgf / cm²) and pipes with a diameter of 102 mm or more - test pressure 3.0 MPa (30 kgf / cm²);
- II - pipes of groups A and B, supplied at the request of the customer with a test hydraulic pressure calculated in accordance with GOST 3845, with an allowable stress equal to 90% of the normative yield strength for pipes made of this steel grade, but not exceeding 20 MPa (200 kgf / cm² ).
(Changed edition, Rev. N 5, 8).
2.12. Pipes heat-treated throughout the volume, groups A and B, with a wall thickness of at least 6 mm, made of steel grades St3sp, St3ps (categories 3-5), 10, 15, 20 and low-alloy steels, must withstand the impact bending tests of the base metal . In this case, the norms of impact strength must correspond to those indicated in Table 4. The impact bending test of the base metal of heat-treated pipes of groups A and B made of steel grade 22GU is carried out at the request of the customer, the impact strength standards are set by agreement between the manufacturer and the customer.
Table 4
The norms of impact strength of pipes made of steel grade 22GU are set by agreement of the parties.
2.13. Heat-treated pipes with a diameter of up to 152 mm inclusive, hot-reduced and non-heat-treated pipes with a diameter of more than 20 to 152 mm inclusive and a wall thickness of 0.06 D n and less, as well as pipes with heat treatment of the welded joint must withstand the flattening test.
Flattening of heat-treated pipes should be carried out up to the distance between the flattening planes H, mm, calculated by the formula
H = [(1 + a) · s] / [a + s / D n],
where a- the coefficient for pipes made of steel grades 08Yu, 08kp, 08ps, 08, 10kp, St2kp is 0.09, and for pipes made of other steel grades it is 0.08;
s- nominal wall thickness, mm;
D n- nominal outer diameter of the pipe, mm.
Flattening of pipes without heat treatment should be carried out up to a distance equal to 2/3 D n. Flattening pipes with heat treatment of the welded joint and hot reduced pipes should be carried out to a distance equal to 1/2 D n.
At the request of the customer, flattening of heat-treated pipes with a diameter of more than 152 to 530 mm should be carried out to a distance equal to 2/3 D n.
(Changed edition, Rev. N 5, 8).
2.14. Pipes with a diameter of up to 108 mm made of carbon steel grades specified in table 5 must pass the expansion test.
Pipes without heat treatment with a diameter of up to 20 mm, as well as a diameter of 20-60 mm with a wall thickness of more than 0.06 D n are not tested for distribution.
The increase in the outer diameter of heat-treated pipes during expansion must comply with the standards specified in Table 5.
Table 5
The increase in the outer diameter of pipes without heat treatment during expansion should be at least 6%.
At the request of the customer, the increase in the outer diameter during the distribution of heat-treated pipes with a wall thickness of up to 4 mm from steel grades 10kp, St2kp should be at least 12%.
(Changed edition, Rev. N 1, 3, 4, 7, 8).
2.15. At the request of the customer, the pipes must withstand the tests provided for in paragraphs 2.16-2.18.
(Changed edition, Rev. N 8).
2.16. Heat-treated pipes up to and including 530 mm in diameter must pass the bend test. The value of the bend radius for pipes with a diameter of up to 60 mm must be at least 2.5 D n, for the base metal of pipes with a diameter of more than 60 to 530 mm - according to GOST 3728. By agreement between the manufacturer and the customer, the bend radius can be reduced.
(Changed edition, Rev. N 1, 8).
2.17. Heat-treated throughout the volume of carbon steel pipes with a diameter of 30 to 159 mm with a wall thickness of not more than 0.08 D must pass the flight test. The flanging value must be at least 24%, while the width of the bent flange, measured from the inner surface of the pipe, must be at least 1.5 of the pipe wall thickness.
The angle of the flanging should be:
- 90 ° - for pipes made of steel grades 08, 10, 15, St2;
- 60 ° - for pipes made of steel grades 20, St3, St4.
(Changed edition, Rev. N 6, 8).
2.18. Pipes with a diameter of 50 mm or more of groups A and B must withstand the tensile test of the welded joint. .one. The temporary resistance of the welded joint of pipes with a diameter of 50 to 203 mm, which have undergone heat treatment throughout the entire volume of the pipe or heat treatment of the welded joint, must be at least 0.9 of the norms specified in Table 1.
The temporary resistance of the welded joint of pipes without heat treatment with a diameter of 50 mm or more must comply with the standards specified in tables 2 and 3.
2.19. Pipes must be airtight. (Changed edition, Rev. N 3).
3. ACCEPTANCE RULES
3.1. Pipes are accepted in batches. The batch should consist of pipes of the same size, one steel grade, one type of heat treatment and one production group, accompanied by one quality document, with the addition - the chemical composition of the steel in accordance with the quality document of the enterprise - the manufacturer of the billet.
The number of pipes in a batch should not exceed, pcs.:
- 1000 - with a diameter of up to 30 mm;
- 600 - with a diameter of St. 30 to 76 mm;
- 400 - with a diameter of St. 76 to 152 mm;
- 200 - with a diameter of St. 152 mm.
3.2. In case of disagreement in assessing the quality of the chemical composition, at least one pipe from the batch is selected for verification.
3.3. Each pipe is subjected to control of the dimensions and quality of the pipe surface. It is allowed to control the dimensions and surface selectively on each batch with a single-stage normal level of control in accordance with the requirements of GOST 18242*. Control plans are established by agreement between the manufacturer and the customer.
* GOST R 50779.71-99** applies on the territory of the Russian Federation.
** See notes of FSUE "STANDARTINFORM".
(Changed edition, Rev. N 3, 8).
*3.3a. Welded seams of pipes of groups A, B and C must be subjected to 100% non-destructive testing.
* See notes of FSUE "STANDARTINFORM".
When carrying out non-destructive testing along the perimeter of the entire pipe, hydraulic testing of type I pipes is allowed not to be carried out.
Instead of non-destructive testing of welded seams of type I pipes, it is allowed to test each pipe with increased hydraulic pressure calculated in accordance with the requirements of GOST 3845 at an allowable stress equal to 85% of the yield strength for pipes with a diameter of 273 mm and more and 75% of the yield strength for pipes with a diameter less than 273 mm, but not exceeding 12 MPa (120 kgf/cm²).
Pipes of group D must be subjected to a hydraulic pressure test or weld inspection by non-destructive methods.
(Changed edition, Rev. N 5, Amendment).
When quality control of the weld by non-destructive methods is carried out additional control of hydraulic pressure on 15% of the pipes of the batch.
By agreement between the manufacturer and the customer, hydraulic pressure testing of pipes is not carried out.
(Introduced additionally, Rev. N 3); (Changed edition, Rev. N 8).
3.4. To check the height of the internal burr, 2% of the pipes from the batch are selected.
3.5. For tests on flattening, expanding, beading, bending, impact strength, the tendency of the base metal of pipes to mechanical aging, stretching of the base metal and the weld, two pipes are selected from the batch.
The yield strength of the base metal of pipes is determined at the request of the customer.
Pipes subjected to the flattening test are not subjected to the expansion test. (Changed edition, Rev. N 1, 6, 8).
3.6. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double number of pipes selected from the same batch.
The retest results apply to the entire lot.
3.7. The welded joints of pipes of groups A, B, C must be controlled by non-destructive methods, and the repaired pipes are tested by hydraulic pressure in accordance with the requirements of clause 3.3a of this standard. tested by hydraulic pressure.
(Changed edition, Rev. N 5).
4. TEST METHODS
4.1. For quality control, one sample is cut from each selected pipe for each type of test, and for impact testing, three samples are cut for each test temperature.
4.2. The chemical composition of steel is determined according to -, - GOST 12354. Samples for determining the chemical composition are taken according to.
Metal carbon equivalent ( C e) low-alloy steel grades are calculated by the formula:
C e = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15,
where C, Mn, Cr, Mo, V, Cu, Ni - mass fraction in steel carbon, manganese, chromium, molybdenum, vanadium, copper, nickel, %.
(Changed edition, Rev. N 6).
4.3. Inspection of the surface of the pipes is carried out visually. The depth of defects is checked by sawing or in another way.
It is allowed to control the surface and dimensions of pipes by non-destructive methods according to technical documentation.
(Changed edition, Rev. N 1).
4.4. Pipes measure:
- length - tape measure;
- outer diameter and ovality - with an adjustable measuring clamp according to either a caliper according to GOST 166, or a micrometer according to; GOST 5378. In case of disagreement in assessing the quality of the cut, the cut is checked with a square and a probe;
- end ring at the ends of pipes - with a ruler according to GOST 427;
- the depth of surface defects - with a depth gauge according to GOST 162. Measurement of the outer diameter of the pipe is carried out at a distance of at least 15 mm from the end of the pipe for pipes with a ratio of the outer diameter to the wall thickness D n / s n, equal to 35 or less; at a distance of at least 2/3 D n- for pipes with ratio D n / s n over 35 to 75; at a distance of at least D n- for pipes with ratio D n / s n over 75.
(Changed edition, Rev. N 1, 3).
4.5. The impact bending test is carried out on longitudinal samples of type 3 according to GOST 9454, cut from a pipe section located at an angle of about 90 ° to the weld.
Impact strength is determined as the arithmetic mean of the test results of three samples. On one of the samples, a decrease in impact strength by 9.8 10 4 J / m² (1 kgf m / cm²) is allowed.
The impact test temperature is specified by the customer in the pipe purchase order.
(Changed edition, Rev. N 1, 6, 8).
4.6. The tendency of the base metal of pipes to mechanical aging is determined according to GOST 7268. It is allowed to straighten the samples with a static load.
4.7. The tensile test is carried out on a longitudinal proportional short sample.
When testing on samples of a segmental section, the latter is cut out from a section located at an angle of about 90 ° to the weld, and is not straightened in the calculated part.
Instead of tensile testing, it is allowed to control the tensile strength, yield strength and relative elongation of pipes by non-destructive methods.
In case of disagreement, the pipes are tested according to.
(Changed edition, Rev. N 1, 7).
4.8. The flattening test is carried out according to .
4.9. The expansion test is carried out on a mandrel with a 30° taper. It is allowed to use mandrels with a taper of 1:10 and deburring at the distribution area.
(Changed edition, Rev. N 3).
4.10. The bend test is carried out according to GOST 3728. Pipes with a diameter of 114 mm are tested on cut longitudinal strips 12 mm wide.
4.11. The beading test is carried out in accordance with GOST 8693. Burr removal is allowed in the flanging area.
4.12. The determination of the temporary resistance of a welded joint of pipes is carried out on ring samples according to the technical documentation. On pipes with a diameter of 219 mm or more, it is allowed to test in accordance with GOST 6996 on samples of type XII with the reinforcement of the welded joint removed, cut perpendicular to the pipe axis, using a static load when straightening the samples .
(Changed edition, Rev. N 7).
4.13. Hydraulic test pipes are carried out in accordance with GOST 3845 with holding under pressure for 5 s.
4.14. The control of the weld is carried out by non-destructive methods (ultrasonic, eddy current, magnetic or x-ray equivalent method) according to the technical documentation.
5. MARKING, PACKAGING, TRANSPORT AND STORAGE
5.1. Marking, packaging, transportation and storage - according to .
FSUE "STANDARTINFORM" NOTES
1 Specified in the section "Information data" to GOST 10705-80:
Replaced by GOST 380-2005;
GOST 18242-72 has been replaced by GOST R ISO 2859-1-2007.
2 In the information index "National Standards" N 5-2005, an amendment to GOST 10705-80 Electric-welded steel pipes was published. Specifications [see Edition (June 2001) with Changes N 1, 2, 3, 4, 5 and the collection "Metal pipes and connecting parts to them. Part 3. Welded pipes. Profile pipes" (Edition 2001)]
ELECTRIC WELDED STEEL PIPES
Specifications
GOST 10705-80
the dateintroductions 01.01.82
This standard applies to steel electric-welded longitudinal pipes with a diameter of 10 to 530 mm made of carbon and low-alloy steel, used for pipelines and structures for various purposes.
The standard does not apply to steel pipes used for the manufacture of thermal electric heaters.
1. ASSORTMENT
1.1. Dimensions and maximum deviations of pipes must comply with GOST 10704-91.
2. TECHNICAL REQUIREMENTS
2.1. Steel electric-welded pipes are manufactured in accordance with the requirements of this standard and in accordance with technical regulations approved in the prescribed manner.
2.2. Depending on the quality indicators, pipes are manufactured in the following groups:
A - with standardization of mechanical properties from calm, semi-quiet and boiling steel grades St1, St2, St3, St4 according to GOST 380-94 (category 4 according to GOST 16523-89, category 1 according to GOST 14637-89);
B - with rationing of the chemical composition from calm, semi-calm and boiling steel grades St1, St2, St3, St4 in accordance with GOST 380-94 and GOST 14637-89, from calm, semi-calm and boiling steel grades 08, 10, 15 and 20 in accordance with GOST 1050 -88, from steel grade 08Yu according to GOST 9045-93, from low-alloy steel grade 22GU with the chemical composition given in Table. 1a (pipes with a diameter of 140 to 426 mm);
B - with normalization of mechanical properties and chemical composition of calm, semi-quiet and boiling steel grades St1, St2, St3, St4 according to GOST 380-94 (category 4 according to GOST 16523-89 and category 2-5 according to GOST 14637-89), from calm, semi-calm and boiling steel grades 08, 10, 15 and 20 according to GOST 1050-88, from steel grade 08Yu according to GOST 9045-93, from low-alloy steel grade 22GU with the chemical composition given in Table. 1a (pipes with a diameter of 140 to 426 mm);
D - with standardization of test hydraulic pressure.
(Revised edition, Rev. No. 5).
2.3. Pipes are manufactured heat-treated (over the entire volume of the pipe or along a welded joint), hot-reduced and without heat treatment.
The type of heat treatment throughout the entire volume of the pipe is chosen by the manufacturer. By agreement between the manufacturer and the consumer, the pipes are thermally treated in a protective atmosphere.
Pipes made of steel grade 22GU are made heat-treated along the welded joint or throughout the volume, pipes made of steel grade St1 - without heat treatment.
Table 1a
(Revised edition, Rev. No. 5).
2.4. The mechanical properties of the base metal of heat-treated and hot-reduced carbon steel pipes must comply with the standards specified in Table. 1. The mechanical properties of heat-treated pipes made of steel grade 22GU are established by agreement of the parties.
Table 1
steel grade | Tensile strength σ in, N / mm 2 (kgf / mm 2) | Yield strength σ t N/mm2 (kgf/mm2) | Relative elongation δ s , % |
at least |
|||
08Yu | 255 (26) | 174 (18) | 30 |
08kp | 294 (30) | 174 (18) | 27 |
08, 08ps, 10kp | 314 (32) | 196 (20) | 25 |
10, 10ps, 15kp, | 333 (34) | 206 (21) | 24 |
St2sp, St2kp, | |||
St2ps | |||
15, 15ps, 20kp, | 372 (38) | 225 (23) | 22 |
St3ps, St3sp, | |||
St3kp | |||
20, 20ps, St4sp, St4ps, St4kp, | 412 (42) | 245 (25) | 21 |
Note. At the request of the consumer, pipes with a wall thickness of 4 mm or more from steel grades St3sp, 15, 15ps are manufactured with a yield strength of 235 N / mm 2 (24 kgf / mm 2), relative elongation of 23%; from steel grades St4sp, 20, 20ps - with a yield strength of 255 N / mm 2 (26 kgf / mm 2), relative elongation of 22%.
(Revised edition, Rev. No. 5).
table 2
steel grade | Yield strength σ t, N/mm2 (kgf/mm2) | ||||||
10 to 19 | St. 19 to 60 | St. 60 to 152 | from 10 to 60 for wall thickness | St. 60 to 152 | |||
over 0.06 D | 0,06 D and less | ||||||
at least |
|||||||
08Yu | 314 (32) | 294 (30) | 264 (27) | 176 (18) | 7 | 16 | 25 |
08ps, 08kp, St1ps, St1kp | 372(38) | 314 (32) | 294 (30) | 176 (18) | 6 | 15 | 23 |
08, St1sp | 372 (38) | 314 (32) | 294 (30) | 186 (19) | 6 | 15 | 23 |
10kp, St2kp | 372 (38) | 333 (34) | 314 (32) | 176 (18) | 6 | 15 | 23 |
10ps, St2ps | 371 (38) | 333 (34) | 314 (32) | 186 (19) | 6 | 15 | 23 |
10, St2sp | 372 (38) | 333 (34) | 314 (32) | 196 (20) | 6 | 15 | 23 |
15kp | 441 (45) | 372 (38) | 353 (36) | 186 (19) | 5 | 14 | 21 |
15ps, 20kp | 441 (45) | 372 (38) | 353 (36) | 196 (20) | 5 | 14 | 21 |
15, 20ps | 441 (45) | 372 (38) | 353 (36) | 206 (21) | 5 | 14 | 21 |
441 (45) | 372 (38) | 353 (36) | 216 (22) | 5 | 14 | 21 | |
St3kp | 441 (45) | 392 (40) | 372 (38) | 196 (20) | 5 | 13 | 20 |
St3ps | 441 (45) | 392 (40) | 372 (38) | 206 (21) | 5 | 13 | 20 |
St3sp | 441 (45) | 392 (40) | 372 (38) | 216 (22) | 5 | 13 | 20 |
St4kp, St4ps | 490 (50) | 431 (44) | 412 (42) | 216 (22) | 4 | 11 | 19 |
St4sp | 490 (50) | 431 (44) | 412 (42) | 225 (23) | 4 | 11 | 19 |
22GU | - | - | 490 (50) | 344 (35) | - | - | 15 |
Note. At the request of the consumer, for pipes of all grades of steel with a diameter of 10 to 60 mm, the relative elongation increases by 3% compared with the standards given in Table. 2.
steel grade | Wall thickness, mm | Tensile strength σ in, N/mm2 (kgf/mm2), with pipe outer diameter D, mm | Yield strength σ t, N / mm 2 (kgf / mm 2) | Relative elongation δ s , %, with pipe outer diameter, D, mm | |||||||||
St. 152 to 244.5 | St. 244.5 to 377 | St. 377 to 530 | |||||||||||
at least |
|||||||||||||
08.08ps, 08kp, 10, 10ps, 10kp, St2kp | 6 or less | - | - | 18 | 20 | 20 | |||||||
More than 6 | 314 (32) | 196 (20) | 15 | 15 | 16 | ||||||||
St2sp, St2ps | 6 or less | - | - | 17 | 18 | 20 | |||||||
More than 6 | 333 (34) | 206 (21) | 14 | 14 | 15 | ||||||||
15, 15ps, 15kp, 20, 20ps, 20kp | 6 or less | 353 (36) | 216 (22) | 17 | 18 | 20 | |||||||
More than 6 | 14 | 14 | 15 | ||||||||||
St3sp, St3ps, St3kp | 6 or less | 353 (36) | 216 (22) | 17 | 17 | 19 | |||||||
More than 6 | 14 | 14 | 14 | ||||||||||
St4sp, St4ps, St4kp | 6 or less | 402 (41) | 225 (23) | 15 | 17 | 18 | |||||||
More than 6 | 11 | 12 | 13 | ||||||||||
22GU | All thicknesses | 490 (50) | 344 (35) | 15 | 15 | 15 |
(Revised edition, Rev. No. 5).
2.5. The mechanical properties of the base metal of pipes with a diameter of 10 to 152 mm inclusive without heat treatment and with heat treatment of the welded joint must comply with the standards specified in Table. 2. The mechanical properties of the base metal of pipes with a diameter of more than 152 to 530 mm inclusive without heat treatment and with heat treatment of the welded joint must comply with the standards specified in Table. 3.
(Revised edition, Rev. No. 5).
2.6. . Cracks, captivity, sunsets, flaws and risks are not allowed on the pipe surface.
Ripples, nicks, dents, small risks, a layer of scale and traces of stripping are allowed provided that they do not take the wall thickness and pipe diameter beyond the maximum deviations. Edge displacement up to 10% of the nominal wall thickness is allowed.
The surface of pipes heat-treated in a protective atmosphere must be free of scale. The presence of an oxide film is allowed.
Lack of penetration of seams must be welded, the place of welding is cleaned. By agreement with the consumer, on pipes with a diameter of 159 mm or more, in places where welds are repaired by welding, the offset of the welded edges is allowed no more than 20% of the nominal wall thickness and the height of the reinforcement bead is not more than 2.5 mm.
Repair by welding of the main metal of pipes is not allowed.
In the case of repair by welding of pipes that have undergone heat treatment, they are subjected to repeated heat treatment (respectively, over the entire volume or over the welded joint).
(Revised edition, Rev. No. 5).
2.7. On pipes with a diameter of 57 mm or more, one transverse seam is allowed.
By agreement between the manufacturer and the consumer, one transverse seam is allowed on pipes with a diameter of less than 57 mm.
2.8. The outer burr on the pipes must be removed. At the place of deburring, the wall may be thinned by 0.1 mm in excess of the minus tolerance.
At the request of the consumer, on pipes with an internal diameter of 33 mm or more, the internal burr must be partially removed or flattened, while the height of the burr or its traces should not exceed 0.35 mm - with a wall thickness of less than 2 mm; 0.4 mm - with a wall thickness of 2 to 3 mm; 0.5 mm - with a wall thickness of more than 3 mm.
The height of the internal burr or its traces for pipes with an internal diameter of less than 33 mm is set by agreement between the manufacturer and the consumer.
2.9. Pipe ends must be square cut and deburred. The formation of a chamfer is allowed. The oblique cut for pipes with a diameter of up to 219 mm should not exceed 1 mm, and for pipes with a diameter of 219 mm or more - 1.5 mm. By agreement between the manufacturer and the consumer, the pipes are made cut into the lines of the mill.
2.10. At the request of the consumer, the ends of pipes with a wall thickness of 5 mm or more must be chamfered at an angle of 25-30 ° to the end of the pipe and an end ring 1.8 mm ± 0.8 mm wide should be left. By agreement between the manufacturer and the consumer, the bevel angle and the width of the end ring can be changed.
2.11. Pipes must withstand the test hydraulic pressure. Depending on the magnitude of the test pressure, pipes are divided into two types:
I - pipes with a diameter of up to 102 mm - test pressure 6.0 MPa (60 kgf / cm 2) and pipes with a diameter of 102 mm or more - test pressure 3.0 MPa (30 kgf / cm 2);
II - pipes of groups A and B, supplied at the request of the consumer with a test hydraulic pressure calculated in accordance with GOST 3845-75, with an allowable stress equal to 90% of the standard yield strength for pipes made of this steel grade, but not exceeding 20 MPa (200 kgf / cm 2).
(Revised edition, Rev. No. 5).
2.12. Heat-treated pipes made of steel grades St3sp, St3ps (categories 3-5), 10, 15 and 20 with a wall thickness of at least 6 mm must withstand the impact bending test of the base metal. In this case, the norms of impact strength must correspond to those indicated in Table. four.
Table 4
The impact bending test of the base metal of heat-treated pipes made of steel grade 22GU is carried out at the request of the consumer, the impact strength standards are set by agreement of the parties.
(Revised edition, Rev. No. 5).
2.13. Heat-treated pipes with a diameter of up to 152 mm inclusive, hot-reduced and non-heat-treated pipes with a diameter of more than 20 to 152 mm inclusive and a wall thickness of 0.06 D n and less, as well as pipes with heat treatment of the welded joint must withstand the flattening test.
Flattening of heat-treated pipes should be carried out up to the distance between the flattening planes H, mm, calculated by the formula
where a- the coefficient for pipes made of steel grades 08Yu, 08kp, 8ps.08, 10kp, St2kp is 0.09, and for pipes made of other steel grades it is 0.08;
S- nominal wall thickness, mm;
D n- nominal outer diameter of the pipe, mm.
Flattening of pipes without heat treatment should be carried out up to a distance equal to 2/3 D n. Flattening of pipes with heat treatment of the welded joint should be carried out up to a distance equal to 1/2 D n.
At the request of the consumer, flattening of heat-treated pipes with a diameter of more than 152 to 530 mm should be carried out to a distance equal to 2/3 D n.
(Revised edition, Rev. No. 5).
2.14. Pipes up to 108 mm in diameter must pass the expansion test.
Pipes without heat treatment with a diameter of up to 20 mm, as well as a diameter of 20-60 mm with a wall thickness of more than 0.06 D They don’t test for a time.
Increasing the outer diameter of heat-treated. pipes during distribution must comply with the standards specified in Table. 5.
Table 5
The increase in the outer diameter of pipes without heat treatment during expansion should be at least 6%.
At the request of the consumer, the increase in the outer diameter during the distribution of heat-treated pipes with a wall thickness of up to 4 mm from steel grades 10kp, St2kp must be at least 12%.
(Changed edition, Rev. No. 1, 3, 4).
2.15. At the request of the consumer, the pipes must withstand. the tests provided for in paragraphs. 2.16-2.18.
2.16. Heat-treated pipes up to and including 530 mm in diameter must pass the bend test. The value of the bend radius for. pipes with a diameter of up to 60 mm should be at least 2.5 D H, for the base metal of pipes with a diameter of more than 60 to 530 mm according to GOST 3728-78. By agreement between the manufacturer and the consumer, the value of the bend radius can be reduced.
2.17. Heat-treated pipes with a diameter of 30 to 159 mm with a ratio D/s, equal to 12.5 or more must pass the flight test. The width of the bent side, measured from the inner surface, must be at least 12% of the inner diameter of the pipe and at least 1.5 wall thickness.
The angle of the flanging should be:
90 ° - for pipes made of steel grades 08, 10, 15, St2;
60 ° - for pipes made of steel grades 20, St3, St4.
2.18. Pipes with a diameter of 50 mm or more of groups A and B must withstand a tensile test of a welded joint.
The temporary resistance of the welded joint of pipes with a diameter of 219 to 530 mm, which have undergone heat treatment throughout the entire volume of the pipe or heat treatment of the welded joint, must comply with the standards specified in Table. 1. The tensile strength of the welded joint of pipes with a diameter of 50 to 203 mm, which have undergone heat treatment over the entire volume of the pipe or heat treatment of the welded joint, must be at least 0.9 of the norms specified in Table. one.
The tensile strength of the welded joint of pipes without heat treatment with a diameter of 50 mm or more must comply with the standards specified in Table. 2 and 3.
(Changed edition, Rev. No. 1, 3).
2.19. Pipes must be sealed.
(Revised edition, Rev. No. 3).
3. ACCEPTANCE RULES
3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, one steel grade, one type of heat treatment and one manufacturing group, accompanied by one quality document, in accordance with GOST 10692-80 with the addition - the chemical composition of steel in accordance with the document on the quality - acceptance - the manufacturer of the workpiece.
The number of pipes in a batch should not exceed, pcs.:
1000 - with a diameter of up to 30 mm;
600 - with a diameter of St. 30 to 76 mm;
400 - with a diameter of St. 76 to 152 mm;
200 - with a diameter of St. 152 mm.
(Revised edition, Rev. No. 1).
3.2. In case of disagreement in assessing the quality of the chemical composition, at least one pipe from the batch is selected for verification.
3.3. Each pipe is subjected to control of the dimensions and quality of the pipe surface. It is allowed to control the dimensions and surface selectively on each batch with a single-stage normal level of control in accordance with the requirements of GOST 18242-72. Control plans are established by agreement between the manufacturer and the consumer.
(Revised edition, Rev. No. 3).
3.3a. Welded seams of pipes of groups A, B and C must be subjected to 100% control by non-destructive methods.
When quality control of the weld by non-destructive methods is carried out additional control of hydraulic pressure on 15% of the pipes of the batch.
By agreement between the manufacturer and the consumer, hydraulic pressure testing of pipes is not carried out.
When carrying out non-destructive testing along the perimeter of the entire pipe, hydraulic testing of type I pipes is allowed not to be carried out.
Instead of non-destructive testing of welded seams of type I pipes, it is allowed to test each pipe with increased hydraulic pressure calculated in accordance with the requirements of GOST 3845-75 at an allowable stress equal to 85% of the yield strength for pipes with a diameter of 273 mm and more and 75% of the yield strength for pipes with a diameter of less than 273 mm, but not exceeding 12 MPa (120 kgf / cm 2).
Pipes of group D must be subjected to a hydraulic pressure test or weld inspection by non-destructive methods.
(Revised edition, Rev. No. 5).
3.4. To check the height of the internal burr, 2% of the pipes from the batch are selected.
3.5. For tests on flattening, expanding, beading, bending, impact strength, the tendency of the base metal of pipes to mechanical aging, stretching of the base metal and the weld, two pipes are taken from the batch.
The yield strength of the base metal of pipes is determined at the request of the consumer.
At the request of the consumer, the determination of impact strength is not carried out.
Pipes subjected to the flattening test are not subjected to the expansion test.
(Revised edition, Rev. No. 1).
3.6. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double number of pipes selected from the same batch.
The retest results apply to the entire lot.
3.7. Welding joints of pipes of groups A, B, C must be controlled by non-destructive methods, and repaired pipes are tested by hydraulic pressure in accordance with the requirements of clause 3.3a of this standard.
Welding joints of pipes of group D must be tested by non-destructive methods, or pipes after repair must be tested with hydraulic pressure.
(Revised edition, Rev. No. 5).
4. TEST METHODS
4.1. For quality control, one sample is cut from each selected pipe for each type of test, and for impact testing, three samples are cut for each test temperature.
4.2. The chemical composition of steel is determined according to GOST 22536.0-87, GOST 22536.1-88, GOST 22536.2-87, GOST 22536.3-88, GOST 22536.4-88, GOST 22536.5-87, GOST 22536.6-88, GOST 12344-88, GOST 12345-88, GOST 12346-78, GOST 12347-77, GOST 12348-78, GOST 12349-83, GOST 12350-78, GOST 12351-81,. GOST 12352-81, GOST 12353-78, GOST 12354-81. Samples for determining the chemical composition are taken according to GOST 7565-81.
4.3. Inspection of the surface of the pipes is carried out visually. The depth of defects is checked by sawing or in another way.
It is allowed to control the surface and dimensions of pipes by non-destructive methods according to technical documentation.
(Revised edition, Rev. No. 1).
4.4. Pipes measure:
length - tape measure according to GOST 7502-89;
outer diameter and ovality - with an adjustable measuring bracket according to GOST 2216-84 or a caliper according to GOST 166-88, or a micrometer according to GOST 6507-89;
inner diameter - with a stopper according to GOST 14810-69 or gauge according to GOST 2015-84, or by subtracting two wall thicknesses from the outer diameter;
curvature - with a straightedge in accordance with GOST 8026-92 and a probe;
wall thickness, thickness difference and height of the internal burr - with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358-89;
edge offset - with a template according to technical documentation or a micrometer in accordance with GOST 6507-90 or a depth gauge in accordance with GOST 162-90;
the cut oblique is provided by the design of equipment for processing the ends of pipes, the bevel angle of the chamfer is provided by a goniometer in accordance with GOST 5378-88. In case of disagreement in assessing the quality of the cut, the cut is checked with a coal miner and a probe;
end ring at the ends of pipes - with a ruler in accordance with GOST 427-75;
the depth of surface defects - with a depth gauge according to GOST 162-90. Measurement of the outer diameter of the pipe is carried out at a distance of at least 15 mm from the end of the pipe for pipes with a ratio of the outer diameter to the wall thickness D h/ S H equal to 35 or less; at a distance of at least 2/3 D H - for pipes with ratio D h/ S H over 35 to 75; at a distance of at least D H - for pipes with ratio D h/ S H over 75.
(Changed edition, Rev. No. 1, 3).
4.5. The impact bending test is carried out on longitudinal specimens of type 3 according to GOST 9454-78, cut from a pipe section located at an angle of about 90 ° to the weld.
Impact strength is determined as the arithmetic mean value based on the results of testing three samples. On one of the samples, a decrease in impact strength by 9.8 10 4 J / m 2 (1 kgf m / cm 2) is allowed.
The temperature of the test for impact bending of pipes made of steel grades 08, 10, 15 and 20 is chosen by the consumer.
(Revised edition, Rev. No. 1).
4.6. The tendency of the base metal of pipes to mechanical aging is determined according to GOST 7268-82. Editing of samples by static load is allowed.
4.7. The tensile test is carried out according to GOST 10006¾80 on a longitudinal (in the form of a strip or pipe section) proportional short sample.
When testing on samples of a segmental section, the latter is cut out from a section located at an angle of about 90 ° to the weld, and is not straightened in the calculated part.
Instead of tensile testing, it is allowed to control the tensile strength, yield strength and relative elongation of pipes by non-destructive methods.
In case of disagreement, pipes are tested in accordance with GOST 10006-80.
(Revised edition, Rev. No. 1).
4.8. The flattening test is carried out according to GOST 8695-75.
4.9. The expansion test is carried out according to GOST 8694-75 on a mandrel with a taper of 30 °. It is allowed to use mandrels with a taper of 1:10 and remove the burr at the distribution area.
(Revised edition, Rev. No. 3).
4.10. The bend test is carried out according to GOST 3728-78. Pipes with a diameter of 114 mm are tested on cut longitudinal strips 12 mm wide.
4.11. The beading test is carried out according to GOST 8693-80. Burr removal is allowed in the flanging area.
4.12. The determination of the tensile strength of a welded joint of pipes with a diameter of 50-530 mm is carried out on ring samples according to the technical documentation.
On pipes with a diameter of 219 mm or more, it is allowed to test in accordance with GOST 6996-66 on specimens of type XII with removed reinforcement of the welded joint, cut perpendicular to the axis of the pipe, using a static load when straightening the specimens.
4.13. Hydraulic testing of pipes is carried out in accordance with GOST 3845-75 with exposure under pressure for 5 s.
4.14. The control of the weld is carried out by non-destructive methods (ultrasonic, eddy current, magnetic or X-ray method equivalent to them) according to the technical documentation.
5. MARKING, PACKAGING, TRANSPORTATIONAND STORAGE
5.1. Marking, packaging, transportation and storage - according to GOST 10692-80.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
DEVELOPERS:
M. M. Bernstein, N. F. Kuzenko
2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated December 25, 1980 No. 5970
3. REPLACE GOST 10705-63
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
Item number | The designation of the NTD to which the link is given | Item number | |
GOST 162-90 | 4.4 | GOST 11358-89 | 4.2 |
GOST 166-89 | 4.4 | GOST 12344-88 | 4.2 |
GOST 380-88 | 2.2 | GOST 12345-88 | 4.2 |
GOST 427-75 | 4.4 | GOST 12346-78 | 4.2 |
GOST 1050-88 | 2.2 | GOST 12347-77 | 4.2 |
GOST 2015-84 | 4.4 | GOST 12348-78 | 4.2 |
GOST 2216-84 | 4.4 | GOST 12349-83 | 4.2 |
GOST 3728-78 | 2.16, 4.10 | GOST 12350-78 | 4.2 |
GOST 3845-75 | 2.11, 4.13 | GOST 12351-81 | 4.2 |
GOST 5378-88 | 4.4 | GOST 12352-81 | 4.2 |
GOST 6507-90 | 4.4 | GOST 12353-78 | 4.2 |
GOST 6996-66 | 4.12 | GOST 12354-81 | 4.2 |
GOST 7268-82 | 4.6 | GOST 14637-89 | 2.2 |
GOST 7502-89 | 4.4 | GOST 14810-69 | 4.4 |
GOST 7565-81 | 4.10 | GOST 16523-89 | 2.2 |
GOST 8026-92 | 4.4 | GOST 18242-72 | 3.5 |
GOST 8693-80 | 4.11 | GOST 22536.0-87 | 4.2 |
GOST 8694-75 | 4.9 | GOST 22536.1-88 | 4.2 |
GOST 8695-75 | 4.8 | GOST 22536.2-87 | 4.2 |
GOST 9045-80 | 2.2 | GOST 22536.3-88 | 4.2 |
GOST 9454-78 | 4.5 | GOST 22536.4-88 | 4.2 |
GOST 10006¾80 | 4.7 | GOST 22536.5-87 | 4.2 |
GOST 10692-80 | 3.1, 5.1 | GOST 22536.6-88 | 4.2 |
GOST 10704-91 | 1.1 |
5. REPUBLICATION (June 1993) with Amendments No. 1, 2, 3, 4, approved in December 1986, December 1987, June 1989, July 1991 (IUS 2-87, 3-88 , 10-89, 10-91).
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Steel pipes, electric-welded straight-seam 426x10 st20 in the following volume: 9 tons
respond to an application - 11.12.2017 at 11:09 LLC PTF "Metallspetsprom" wants to buy:
Pipes steel, electrowelded f32-150mm wall thickness 4-12mm steel: one of: 12mx, 15xm, 12x1mf, 12x1mf-pv, 20xl, 15x1m1f, 20xmfl, 15x1m1fl, in the following volume: 1.5 m/p Pipes steel, electrowelded f150-500mm wall thickness 12-25 steel: one of: 12mx, 15xm, 12x1mf, 12x1mf-pv, 20xl, 15x1m1f, 20xmfl, 15x1m1fl, in the following volume: 2 m/pCustomer wishes: pipe cuttings are needed for welding samples ... steel grade is one of: 12mx, 15xm, 12x1mf, 12x1mf-pv, 20xl, 15x1m1f, 20xmfl, 15x1m1fl pipe f32-150mm wall thickness 4-12mm - 1.5 meters pipe f150-500mm wall thickness 12-25 - 2 meters respond to an application
Ads to sell buy Steel pipes, electrowelded GOST 10705-80 in the region "Moscow"
old and used pipes 219,325,426,530,720,820
Old and used pipes 219,325,426,530,720,820 and above. learn more information by phone 8-926-310-03-01 aton-steel.ru
Pipe stale and restored
Sell tubing 73 used washed 18600 R/t; tubing 73 used steamed 19700 r/t; 219*6-7 p/w, used, oil, 27.000 R/t; 273*10-12 ct, used, water, for piles. 20.000r/tn; 273*10 used, ct, oil, 22.500r/tn; 273*10 qt, restored. 29.000 r/t; 325*8 ct, restored. 32500r/tn. finished pile 325 * 10 b / sh. 45...
We offer a titanium square 190x190 W-5-1
We offer a titanium square 190x190 BT-5-1 in the amount of 10.308 tons, from the State Reserve, located in the city of Odintsovo, Moscow region. If you are interested, we will send a price list, certificates and photos. We are ready to consider your offer and come to a mutually beneficial solution for the price!!! Contact phone...