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GOST 8733 87 cold-formed seamless steel pipes. Marking, packaging, transportation and storage

Introduction date 01.01.76

This International Standard applies to general purpose cold-formed and heat-formed carbon and alloy steel seamless pipes.

(Changed edition, Rev. No. 4).

1. TECHNICAL REQUIREMENTS

1.1. Pipes are manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner.

Pipe dimensions and maximum deviations for them must comply with those specified in GOST 8734 and GOST 9567.

1.2. Depending on the quality indicators, pipes should be manufactured in the following groups:

B - with rationing of the chemical composition, from calm steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

B - with the rationing of the mechanical properties indicated in Table. 1, and chemical composition, from steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

G - with standardization of mechanical properties, controlled on heat-treated samples, and chemical composition, from steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281. Mechanical properties standards must comply with the requirements of the relevant steel standards;

D - without rationing of mechanical properties and chemical composition, but with rationing of the test hydraulic pressure;

E - after special heat treatment. Steel grades, heat treatment mode and mechanical properties standards are established by documentation approved in the prescribed manner.

Table 1

steel grade	Tensile strength s in, N / mm 2 (kgf / mm 2)	Yield strength s t, N / mm 2 (kgf / mm 2)	Relative elongation d 5 %	Brinell hardness (with wall thickness over 10 mm)
steel grade	at least			Indentation diameter, mm, not less than	Hardness number HB, no more
10	343 (35)	206 (21)	24	5,1	137
20	412 (42)	245 (25)	21	4,8	156
35	510 (52)	294 (30)	17	4,4	187
45	589 (60)	323 (33)	14	4,2	207
10G2	422 (43)	245 (25)	22	4,3	197
15X	412 (42)	-	19	4,5	179
20X	431 (44)	-	17	4,5	179
40X	618 (63)	-	14	4,1	217
30HGSA	491 (50)	-	18	4,0	229
15XM	431 (44)	226 (23)	21	-	-

Note. Mechanical properties of pipes made of steel grades not listed in Table. 1, as well as the norms of impact strength and relative narrowing for steel of all grades are established by agreement between the manufacturer and the consumer

(Changed edition, Rev. No. 3, 4).

1.3. Pipes are made heat-treated. Without heat treatment, pipes are produced in which the ratio of the outer diameter D to wall thickness S equal to 50 or more, as well as at the request of the consumer. In the manufacture of pipes without heat treatment, the norms of mechanical properties are established by agreement between the manufacturer and the consumer.

Note. By agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with a ratio D/S, equal to 50 or more, heat-treated.

1.4. Cracks, captivity, flaws, shells and sunsets are not allowed on the surface of the pipes.

Separate minor nicks, scale (traces of exfoliated scale) that do not interfere with inspection, dents, traces of straightening, risks and traces of cleaning defects are allowed if they do not take the dimensions of the pipes beyond the maximum deviations.

1.5. At the request of the consumer, the surface of the pipe must be cleaned of scale.

1.3−1.5.

1.6. Pipe ends must be cut at a right angle and deburred; chamfering is allowed when deburring.

1.7. At the request of the consumer, at the ends of pipes to be welded, with a wall thickness of 5 mm or more, chamfers must be removed at an angle of 35–40 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left.

1.8. All types of pipes operating under pressure (the operating conditions of the pipes are specified in the order) must withstand the test hydraulic pressure (P1), in MPa (kgf / cm2), calculated according to the formula given in GOST 3845, where R- allowable stress equal to 40% of the tensile strength for a given steel grade, in N / mm 2 (kgf / mm 2).

The ability of pipes to withstand hydraulic pressure is ensured by the pipe production technology.

(Changed edition, Rev. No. 3).

1.8a. At the request of the consumer, the pipes must withstand the hydraulic pressure calculated according to the formula GOST 3845, but not exceeding 20 MPa (200 kgf / cm 2).

By agreement between the manufacturer and the consumer, it is allowed to test pipes under a pressure of more than 20 MPa (200 kgf / cm 2).

Instead of hydraulic testing, it is allowed to carry out control of each pipe by a non-destructive method, ensuring that the pipes comply with the test hydraulic pressure standards, ( R 1), in MPa (kgf / cm 2), according to the formula given in GOST 3845.

(Introduced additionally, Rev. No. 3).

1.9. At the request of the consumer, heat-treated pipes made of steel grades 10, 20 and 15XM, depending on the purpose and operating conditions, must withstand one or more technological tests specified in paragraphs. 1.10−1.13.

(Changed edition, Rev. No. 3).

1.10. The pipes must pass the bend test.

1.11. The expansion test must withstand pipes with a diameter of not more than 160 mm and a wall thickness of not more than 8 mm on a mandrel with a taper of 1:10 until the outer diameter is increased, indicated in Table. 2.

table 2

1.12. The flattening test must withstand pipes with a diameter of 22 mm or more with a wall thickness of not more than 10 mm until a distance between the flattening surfaces is obtained ( H) in millimeters, calculated by the formula

where S- nominal wall thickness, mm;

D- nominal outer diameter of the pipe, mm.

(Changed edition, Rev. No. 3).

1.13. The beading test must be carried out by pipes with an outer diameter of at least 25 mm and not more than 160 mm with a wall thickness of:

no more than 10% of the outer diameter - for pipes with an outer diameter of up to 60 mm;

no more than 8% of the outer diameter - for pipes with an outer diameter of more than 60 to 108 mm;

no more than 6% of the outer diameter - for pipes with an outer diameter over 108 to 140 mm;

no more than 5% of the outer diameter - for pipes with an outer diameter of more than 140 to 160 mm.

The width of the bent side, measured from the inner surface of the pipe, must be at least 12% of the inner diameter of the pipe and at least 1.5 of the wall thickness.

The angle of the flanging should be:

90 ° - for pipes made of steel grade 10;

60 ° - for pipes made of steel grades 20 and 15XM.

1.14. (Deleted, Rev. No. 3).

2. ACCEPTANCE RULES

2.1. Pipes are accepted in batches.

The batch must consist of pipes of the same size, one steel grade and one type of heat treatment, accompanied by one quality document in accordance with GOST 10692.

The number of pipes in a batch should be no more than:

400 pcs. - for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm;

200 pcs. - for pipes of other sizes.

It is allowed to increase the batch size up to 600 pcs. - for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm and up to 300 pcs. - for pipes of other sizes.

2.2. At the request of the consumer, the batch must consist of pipes made of steel of the same heat.

2.1, 2.2. (Changed edition, Rev. No. 3).

2.3. Each pipe must be inspected and measured.

2.4. The chemical composition of pipe steel is taken according to the document on the quality of the blank manufacturer.

2.5. To control the mechanical properties, tests for bending, expanding, flattening and beading, two pipes are selected from the batch. To control the chemical composition, one pipe is taken from the batch.

2.4, 2.5. (Changed edition, Rev. No. 3).

2.6. To test for hardness, 2% of the pipes (but not less than two pipes) from the batch are tested.

2.7. The yield strength and Brinell hardness of steel pipes are determined by the manufacturer periodically at the request of the consumer.

(Changed edition, Rev. No. 3).

2.8. (Deleted, Rev. No. 3).

2.9. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double sample from the same batch.

The retest results apply to the entire lot.

(Changed edition, Rev. No. 3).

3. TEST METHODS

3.1. From each pipe selected from the batch, one sample is cut out.

3.2. Inspection of pipes is carried out without the use of special devices. The depth of defects is checked by sawing or otherwise.

The length of the pipes is controlled by a tape measure according to GOST 7502.

The curvature of the pipes is controlled by a straightedge according to GOST 8026 and a probe according to TU 2-034-225.

The diameter and ovality are controlled with a smooth micrometer of the MK type according to GOST 6507, with sheet staples according to GOST 18360, GOST 18365.

The wall thickness is controlled by a pipe micrometer of the MT type according to GOST 6507.

It is allowed to carry out surface quality control with devices according to normative and technical documentation.

3.3. Chemical analysis of pipe steel in the event of disagreement is carried out according to GOST 22536.0 - GOST 22536.6, GOST 12344- - GOST 12365, GOST 28473.

Samples for determining the chemical composition of pipe steel are taken according to GOST 7565.

3.2, 3.3. (Changed edition, Rev. No. 3, 4).

It is allowed to control the mechanical properties of pipes by non-destructive methods according to the normative and technical documentation.

In case of disagreement in evaluating the results, the tests are carried out in accordance with GOST 10006.

(Changed edition, Rev. No. 2, 3, 4).

3.5. The hardness test is carried out according to GOST 9012 at both ends of the pipe.

On pipes that have passed heat treatment in continuous furnaces, the hardness test is carried out at one end of the tube.

It is allowed to determine the hardness on samples intended for tensile testing.

It is allowed to control hardness by non-destructive methods according to normative and technical documentation. In case of disagreement in evaluating the results, the tests are carried out in accordance with GOST 9012.

(Changed edition, Rev. No. 3).

3.6. Hydraulic test pipes are carried out in accordance with GOST 3845 with holding under pressure for at least 10 s.

3.7. The pipe bend test is carried out according to GOST 3728.

3.8. Pipe testing for expansion is carried out according to GOST 8694.

3.9. The pipe flattening test is carried out according to GOST 8695.

If the smallest tears or other minor defects are found on flattened samples, it is allowed to re-test for flattening another sample taken from the same pipe with preliminary removal of the surface layer of the sample (inner and outer) to a depth of not more than 0.2 mm.

(Changed edition, Rev. No. 3).

3.10. Pipe testing for beading is carried out in accordance with GOST 8693.

4. MARKING, PACKAGING, TRANSPORT AND STORAGE

4.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS

G. I. Gulyaev, V. P. Sokurenko, N. I. Petrenko

2. APPROVED AND PUT INTO EFFECT by the Decree of the State Committee for Standards of the Council of Ministers of the USSR dated 11/19/74 No. 2561

3. REPLACE GOST 8733-66

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

Designation of NTD, on which is given the link	Item number	Designation of NTD, on which is given the link	Item number
GOST 1050-88	1.2	GOST 12354-81	3.3
GOST 3728-78	3.7	GOST 12355-78	3.3
GOST 3845-75	1.8, 1.8a, 3.6	GOST 12356-81	3.3
GOST 4543-71	1.2	GOST 12357-84	3.3
GOST 6507-90	3.2	GOST 12358-2002	3.3
GOST 7502-98	3.2	GOST 12359-99	3.3
GOST 7565-81	3.3	GOST 12360-82	3.3
GOST 8026-92	3.2	GOST 12361-2002	3.3
GOST 8693-80	3.10	GOST 12362-79	3.3
GOST 8694-75	3.8	GOST 12363-79	3.3
GOST 8695-75	3.9	GOST 12364-84	3.3
GOST 8734-75	1.1	GOST 12365-84	3.3
GOST 9012-59	3.5	GOST 14959-79	1.2
GOST 9567-75	1.1	GOST 18360-93	3.2
GOST 10006-80	3.4	GOST 18365-93	3.2
GOST 10692-80	2.1, 4.1	GOST 19281-89	1.2
GOST 12344-2003	3.3	GOST 22536.0-87	3.3
GOST 12345-2001	3.3	GOST 22536.1−88	3.3
GOST 12346-78	3.3	GOST 22536.2-87	3.3
GOST 12347-77	3.3	GOST 22536.3-88	3.3
GOST 12348-78	3.3	GOST 22536.4−88	3.3
GOST 12349-83	3.3	GOST 22536.5-87	3.3
GOST 12350-78	3.3	GOST 22536.6-88	3.3
GOST 12351-81	3.3	GOST 28473-90	3.3
GOST 12352-81	3.3	TU 2-034-225-87	3.2
GOST 12353-78	3.3

STEEL PIPES

Technicalrequirements

GOST 8733-74

STATE STANDARD OF THE UNION OF THE SSR

STEEL PIPES

Technicalrequirements

Seamless cold and warm deformed pipes. Specifications

GOST

8733-74

Introduction date 01.01.76

This International Standard applies to general purpose cold-formed and heat-formed carbon and alloy steel seamless pipes.

(Revised edition, Rev. No. 4).

1. TECHNICAL REQUIREMENTS

Pipe dimensions and maximum deviations for them must comply with those specified in GOST 8734 and GOST 9567.

B - with rationing of the chemical composition, from calm steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

B - with the rationing of the mechanical properties specified in, and the chemical composition, from steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

D - without rationing of mechanical properties and chemical composition, but with rationing of test hydraulic pressure;

E - after special heat treatment. Steel grades, heat treatment mode and mechanical properties standards are established by documentation approved in the prescribed manner.

steel grade	Temporary resistances in, N / mm 2 (kgf / mm 2)	Yield strengths t, N/mm 2 (kgf/mm 2)	Relative extensiond 5 , %	Brinell hardness (with wall thickness over 10 mm)
steel grade	at least			Indentation diameter, mm, not less than	Hardness number HB, no more
	343(35)	206(21)
	412(42)	245(25)
	510(52)	294(30)
	589(60)	323(33)
10G2	422(43)	245(25)
15X	412(42)
20X	431(44)
40X	618(63)
30HGSA	491(50)
15XM	431(44)	226(23)

Note. The mechanical properties of pipes made of steel of grades not specified in, as well as the norms of impact strength and relative narrowing for steel of all grades, are established by agreement between the manufacturer and the consumer

(Changed edition, Rev. No. 3, 4).

1.3. Pipes are made heat-treated. Without heat treatment, pipes are produced in which the ratio of the outer diameterDto wall thicknessSequal to 50 or more, as well as at the request of the consumer. In the manufacture of pipes without heat treatment, the norms of mechanical properties are established by agreement between the manufacturer and the consumer.

Note. By agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with a ratio D/S, equal to 50 or more, heat-treated.

1.4. Cracks, captivity, flaws, shells and sunsets are not allowed on the surface of the pipes.

1.5. At the request of the consumer, the surface of the pipe must be cleaned of scale.

1.3-1.5.

1.6. Pipe ends must be cut at a right angle and deburred; chamfering is allowed when deburring.

1.7. At the request of the consumer, the ends of the pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left.

(Introduced additionally, Rev. No. 3).

(Revised edition, Rev. No. 3).

1.11. The expansion test must withstand pipes with a diameter of not more than 160 mm and a wall thickness of not more than 8 mm on a mandrel with a taper of 1:10 until the increase in the outer diameter specified in.

steel grade	Increase in the outer diameter of the pipe,%, with wall thickness, mm
steel grade	up to 4	over 4

20, 15HM

where S- nominal wall thickness, mm;

D - nominal outer diameter of the pipe, mm.

(Revised edition, Rev. No. 3).

no more than 10% of the outer diameter - for pipes with an outer diameter of up to 60 mm;

no more than 8% of the outer diameter - for pipes with an outer diameter of more than 60 to 108 mm;

no more than 6% of the outer diameter - for pipes with an outer diameter over 108 to 140 mm;

not more than 5% of the outer diameter - for pipes with an outer diameter over 140 to 160 mm.

The width of the bent flange, measured from the inner surface of the pipe, must be at least 12% of the inner diameter of the pipe and at least 1.5 of the wall thickness.

The angle of the flanging should be:

90 ° - for pipes made of steel grade 10;

60 ° - for pipes made of steel grades 20 and 15XM.

1.14. (Deleted, Rev. No. 3).

2. ACCEPTANCE RULES

The batch must consist of pipes of the same size, one steel grade and one type of heat treatment, accompanied by one quality document in accordance with GOST 10692.

The number of pipes in a batch should be no more than:

400 pcs. - for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm;

200 pcs. - for pipes of other sizes.

2.2. At the request of the consumer, the batch must consist of pipes made of steel of the same heat.

2.1, 2.2. (Revised edition, Rev. No. 3).

2.3. Each pipe must be inspected and measured.

2.4. The chemical composition of pipe steel is taken according to the document on the quality of the blank manufacturer.

2.4, 2.5. (Revised edition, Rev. No. 3).

2.6. To test for hardness, 2% of the pipes (but not less than two pipes) from the batch are tested.

2.7. The yield strength and Brinell hardness of steel pipes are determined by the manufacturer periodically at the request of the consumer.

(Revised edition, Rev. No. 3).

2.8.(Deleted, Rev. No. 3).

2.9. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double sample from the same batch.

The retest results apply to the entire lot.

(Revised edition, Rev. No. 3).

3. TEST METHODS

3.1. From each pipe selected from the batch, one sample is cut out.

The length of the pipes is controlled by a tape measure according to GOST 7502.

The curvature of the pipes is controlled by a straightedge according to GOST 8026 and a probe according to TU 2-034-225.

The diameter and ovality are controlled with a smooth micrometer of the MK type according to GOST 6507, with sheet staples according to GOST 18360, GOST 18365.

The wall thickness is controlled by a pipe micrometer of the MT type according to GOST 6507.

It is allowed to carry out surface quality control with devices according to normative and technical documentation.

(Changed edition, Rev. No. 2, 3, 4).

(Revised edition, Rev. No. 3).

4. MARKING, PACKAGING, TRANSPORT AND STORAGE

GOST 12353-78

GOST 12354-81

GOST 12355-78

GOST 4543-71

GOST 12356-81

GOST 6507-90

GOST 12357-84

GOST 7502-89

GOST 12358-82

GOST 7565-81

GOST 12359-81

GOST 8026-92

GOST 12360-82

______________
* Canceled. On the territory of the Russian Federation, GOST 12351-2003 applies. - Note "CODE".

TU 2-034-225-87

5. The validity period was removed according to protocol N 6-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 3-96)

6. EDITION with Amendments No. 1, 2, 3, 4, approved in March 1976, February 1980, December 1985, April 1992 (IUS 4-76, 4-80, 4-86, 7 -92)

This International Standard applies to general purpose cold-formed and heat-formed carbon and alloy steel seamless pipes.

(Changed edition, Rev. N 4).

1. TECHNICAL REQUIREMENTS

1.1. Pipes are manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner.

Pipe dimensions and maximum deviations for them must comply with those specified in GOST 8734 and GOST 9567.

1.2. Depending on the quality indicators, pipes should be manufactured in the following groups:

B - with rationing of the chemical composition, from calm steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

B - with the rationing of the mechanical properties indicated in Table 1, and the chemical composition, from steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281;

G - with standardization of mechanical properties, controlled on heat-treated samples, and chemical composition, from steel grades according to GOST 1050, GOST 14959, GOST 4543 and GOST 19281. Mechanical properties standards must comply with the requirements of the relevant steel standards;

D - without rationing of mechanical properties and chemical composition, but with rationing of test hydraulic pressure;

E - after special heat treatment. Steel grades, heat treatment mode and mechanical properties standards are established by documentation approved in the prescribed manner.

Table 1


steel grade	Tensile strength, N/mm (kgf/mm)	Yield strength N/mm (kgf/mm)	Relative extension , %	Brinell hardness (for wall thickness over 10 mm)
	at least			Imprint diameter, mm, at least	hardness number, hb, no more

Note. The mechanical properties of pipes made of steel grades not listed in Table 1, as well as the norms of impact strength and relative narrowing for steel of all grades, are established by agreement between the manufacturer and the consumer.

(Changed edition, Rev. N 3, 4).

1.3. Pipes are made heat-treated. Without heat treatment, pipes are produced, in which the ratio of the outer diameter to the wall thickness is 50 or more, and also at the request of the consumer. In the manufacture of pipes without heat treatment, the norms of mechanical properties are established by agreement between the manufacturer and the consumer.

Note. By agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with a ratio / equal to 50 or more, heat-treated.

1.4. Cracks, captivity, flaws, shells and sunsets are not allowed on the surface of the pipes.

Separate minor nicks, scale (traces of exfoliated scale) that do not interfere with inspection, dents, traces of straightening, risks and traces of cleaning defects are allowed if they do not take the dimensions of the pipes beyond the maximum deviations.

1.5. At the request of the consumer, the surface of the pipe must be cleaned of scale.

1.3-1.5. (Changed edition, Rev. N 3).

1.6. Pipe ends must be cut at a right angle and deburred; chamfering is allowed when deburring.

1.7. At the request of the consumer, at the ends of pipes to be welded, with a wall thickness of 5 mm or more, chamfers must be removed at an angle of 35 ° - 40 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left.

1.8. Pipes of all types operating under pressure (the operating conditions of the pipes are specified in the order) must withstand the test hydraulic pressure (), in MPa (kgf / cm), calculated according to the formula given in GOST 3845, where is the allowable stress equal to 40% of the temporary tensile strength for a given steel grade, in N/mm (kgf/mm).

The ability of pipes to withstand hydraulic pressure is ensured by the pipe production technology.

(Changed edition, Rev. N 3).

1.8a. At the request of the consumer, the pipes must withstand the hydraulic pressure calculated according to the formula GOST 3845, but not exceeding 20 MPa (200 kgf / cm).

By agreement between the manufacturer and the consumer, it is allowed to test pipes under a pressure of more than 20 MPa (200 kgf/cm).

Instead of hydraulic testing, it is allowed to control each pipe by a non-destructive method, ensuring that the pipes comply with the test hydraulic pressure standards, (), MPa (kgf / cm), according to the formula given in GOST 3845.

(Introduced additionally, Rev. N 3).

1.10. The pipes must pass the bend test.

table 2


steel grade	Increase in the outer diameter of the pipe,%, with wall thickness, mm
		over 4

1.12. The flattening test must withstand pipes with a diameter of 22 mm or more with a wall thickness of not more than 10 mm until a distance () in millimeters between the flattening surfaces is obtained, calculated by the formula

where is the nominal wall thickness, mm;

- nominal outer diameter of the pipe, mm.

(Changed edition, Rev. N 3).

1.13. The beading test must be carried out by pipes with an outer diameter of at least 25 mm and not more than 160 mm with a wall thickness of:

no more than 10% of the outer diameter - for pipes with an outer diameter of up to 60 mm;

no more than 8% of the outer diameter - for pipes with an outer diameter of over 60 to 108 mm;

no more than 6% of the outer diameter - for pipes with an outer diameter over 108 to 140 mm;

not more than 5% of the outer diameter - for pipes with an outer diameter of over 140 to 160 mm.

The width of the bent side, measured from the inner surface of the pipe, must be at least 12% of the inner diameter of the pipe and at least 1.5 of the wall thickness.

The angle of the flanging should be:

90 ° - for pipes made of steel grade 10;

60 ° - for pipes made of steel grades 20 and 15XM.

1.14. (Deleted, Rev. N 3).

2. ACCEPTANCE RULES

2.1. Pipes are accepted in batches.

The batch must consist of pipes of the same size, one steel grade and one type of heat treatment, accompanied by one quality document in accordance with GOST 10692.

The number of pipes in a batch should be no more than:

400 pcs. - for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm;

200 pcs. - for pipes of other sizes.

It is allowed to increase the batch size up to 600 pcs. - for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm and up to 300 pcs. - for pipes of other sizes.

2.2. At the request of the consumer, the batch must consist of pipes made of steel of the same heat.

2.1, 2.2. (Changed edition, Rev. N 3).

2.3. Each pipe must be inspected and measured.

2.4. The chemical composition of pipe steel is taken according to the document on the quality of the blank manufacturer.

2.4, 2.5. (Changed edition, Rev. N 3).

2.6. To test for hardness, 2% of the pipes (but not less than two pipes) from the batch are tested.

2.7. The yield strength and Brinell hardness of steel pipes are determined by the manufacturer periodically at the request of the consumer.

(Changed edition, Rev. N 3).

2.8. (Deleted, Rev. N 3).

2.9. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double sample from the same batch.

The retest results apply to the entire lot.

(Changed edition, Rev. N 3).

3. TEST METHODS

3.1. From each pipe selected from the batch, one sample is cut out.

3.2. Inspection of pipes is carried out without the use of special devices. The depth of defects is checked by sawing or otherwise.
.

3.2, 3.3. (Changed edition, Rev. N 3, 4).

3.4. The tensile test is carried out according to GOST 10006 on a longitudinal proportional short sample. For samples in the form of a strip or pipe section, the test speed to the yield point should be no more than 10 mm/min, beyond the yield point - no more than 40 mm/min.

It is allowed to control the mechanical properties of pipes by non-destructive methods according to the normative and technical documentation.

In case of disagreement in evaluating the results, the tests are carried out in accordance with GOST 10006.

(Changed edition, Rev. N 2, 3, 4).

3.5. The hardness test is carried out according to GOST 9012 at both ends of the pipe.

On pipes heat treated in continuous furnaces, the hardness test is carried out at one end of the pipe.

It is allowed to determine the hardness on samples intended for tensile testing.

It is allowed to control hardness by non-destructive methods according to normative and technical documentation. In case of disagreement in evaluating the results, the tests are carried out in accordance with GOST 9012.

If the smallest tears or other minor defects are found on flattened samples, it is allowed to re-test for flattening another sample taken from the same pipe with preliminary removal of the surface layer of the sample (inner and outer) to a depth of not more than 0.2 mm.

(Changed edition, Rev. N 3).

3.10. Pipe testing for beading is carried out in accordance with GOST 8693.

4. MARKING, PACKAGING, TRANSPORT AND STORAGE

4.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692.

The text of the document is verified by:
official publication
Pipes metal and connecting parts to them.
Part 1. Smooth seamless pipes: Sat. GOSTs. -
Moscow: IPK Standards Publishing House, 2004

TECHNICAL CONDITIONS

Official edition

PUBLISHING HOUSE OF STANDARDS Moscow

UDC 621.774.35.016.3:006.354 Group B62

STATE STANDARD OF THE UNION OF THE SSR

STEEL PIPES

Specifications

Seamless cold-deformed and thermal-deformed steel pipes. Specifications

OKP 13 4400 13 5100

Date of introduction 01.01.95

This standard applies to cold-formed and heat-formed seamless pipes made of carbon, low-alloy, alloy steel for pipelines, structures, machine parts and other technical purposes.

The technical level indicators established by this standard are provided for the highest quality category.

1. TECHNICAL REQUIREMENTS

1.1. Pipe dimensions and maximum deviations for them must comply with those given in GOST 8734-75 and GOST 9567-75.

1.2. Characteristics

1.2.1. Depending on the normalized indicators, pipes should be manufactured in the following groups:

B - with standardization of the chemical composition from calm steel grades according to GOST 1050-88

B - with the normalization of the mechanical properties given in table. 1, and the chemical composition of steel grades according to GOST 1050-88, GOST 4543-71 and GOST 19281-89;

G - with standardization of mechanical properties, controlled on heat-treated samples, and chemical composition of steel grades according to GOST 1050-88, GOST 4543-71 and GOST 19281-89. Mechanical properties standards must comply with the requirements of the relevant steel standards;

D - with standardization of test hydraulic pressure, but without standardization of mechanical properties and chemical composition.

Official publication Reprint prohibited

Editor L. V. Afanasenko Technical editor O. N. Nikitina Proofreader V. I. Varentsova

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Table 1

steel grade	Temporary tensile strength sg in\u003e N / mm 2 (kgf / mm 2)	Yield strength SG T » N/mm 3 (kgf/mm 2)	Relative elongation 6s, %	Hardness but (with a thickness of more than 10 Indentation diameter, mm, not less than	Brinell ge wall mm) Hardness number HB, no more
steel grade					Brinell ge wall mm) Hardness number HB, no more

Notes:

1. Mechanical properties of pipes made of steel grades not listed in Table. I, as well as the standards of impact strength, relative narrowing and Brinell hardness (with a thickness of 3 to 10 mm) for steel of all grades are established by agreement between the manufacturer and the consumer.

2. At the request of the consumer, pipes with an impact strength of at least 3 kgf * m / cm 2 are manufactured from steel grades 10 and 20 at a temperature of minus 40 ° C and grade 10G2 - at a temperature of minus 60 ° C.

1.3. Pipes are made heat-treated. Without heat treatment, pipes are produced in which the ratio of the outer diameter D to the wall thickness S is 50 or more. In the manufacture of pipes without heat treatment, the norms of mechanical properties are set by agreement between the manufacturer and the consumer.

At the request of the consumer, pipes with a D / S ratio of 50 or more are produced, heat-treated.

1.4. Cracks, captivity, flaws, shells, delaminations and sunsets are not allowed on the surfaces of pipes.

Separate minor nicks, scale (traces of exfoliated scale) that do not interfere with inspection, dents, traces of straightening, risks and traces of cleaning defects are allowed if they do not take the pipe dimensions beyond the maximum deviations, but not more than 2.0 mm.

At the request of the consumer, the surface of the pipe must be cleaned of scale and (or) grease.

1.5. Additional requirements for pipes intended for the manufacture of parts by machining are established by agreement between the manufacturer and the consumer.

1.6. Pipe ends must be square cut and deburred.

1.7. At the request of the consumer, the ends of pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 30-35 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left. The chamfer made by plasma cutting is subjected to mechanical cleaning.

1.8. For all types of pipes operating under pressure, the test hydraulic pressure is calculated according to GOST 3845-75, where R is the allowable stress equal to 80% of the yield strength, when it is normalized, or 40% of the temporary resistance - for steel grades without a normalized yield strength .

Pipes must withstand hydraulic pressure in accordance with the requirements of GOST 3845-75, but not more than 20 MPa (200 kgf / cm 2), at the request of the consumer - over 20 MPa (200 kgf / cm 2).

1.9. At the request of the consumer, heat-treated pipes made of steel grades 10, 20, 09G2S, 10G2 and 15XM, depending on the purpose and operating conditions, must withstand one or more technological tests given in paragraphs. 1.10-1.13.

1.10. Pipes must withstand bend tests.

1.11. The expansion test must withstand pipes with a diameter of not more than 159 mm and a wall thickness of not more than 9 mm on a mandrel with a taper of 30 ° until the outer diameter is increased, given in Table. 2.

table 2

1.12. The flattening test must withstand pipes with a diameter of 22 mm or more with a wall thickness of not more than 15% of the outer diameter of the pipe until a distance R in millimeters is obtained between the flattening surfaces, calculated by the formula

where S - nominal wall thickness, mm;

D - nominal outer diameter of the pipe, mm,

1.13. The beading test must be carried out by pipes with an outer diameter of at least 25 mm and not more than 160 mm with a wall thickness of:

no more than 10% of the outer diameter - for pipes with an outer diameter of up to 60 mm;

no more than 8% of the outer diameter - for pipes with an outer diameter of more than 60 to 108 mm;

no more than 6% of the outer diameter - for pipes with an outer diameter over 108 to 140 mm;

not more than 5% of the outer diameter - for pipes with an outer diameter over 140 to 160 mm.

The width of the bent flange, which is measured from the inner surface of the pipe, must be at least 12% of the inner diameter of the pipe and at least 1.5 of the wall thickness.

The angle of the flanging should be:

90 ° - for pipes made of steel grades 10, 10G2;

60 ° - for pipes made of steel grades 20 and 15XM.

1.14. Marking and packaging - according to GOST 10692-80.

2. ACCEPTANCE

2.1. Pipes are accepted in batches.

The batch must consist of pipes of the same size, one steel grade and one type of heat treatment, accompanied by one quality document in accordance with GOST 10692-80 with the addition:

for a batch consisting of one heat, the chemical composition of the steel in accordance with the billet quality document.

2.2. At the request of the consumer, the batch should consist of pipes made of steel of the same heat.

2.3. The number of pipes in a batch should be no more than 400 pieces - for pipes with a diameter of not more than 76.0 mm and with a wall thickness of not more than 2.5 mm; 200 pieces - for pipes of other sizes.

It is allowed to increase the batch size up to 600 pcs. for pipes with a diameter of not more than 76 mm and with a wall thickness of not more than 2.5 mm and up to 300 pcs. for pipes of other sizes.

2.4. Each pipe is controlled by dimensions and surface quality.

2.5. The manufacturer accepts the chemical composition of pipe steel according to the document on the quality of the enterprise that manufactures the blanks.

2.6. To control mechanical properties, tests for bending, expanding, flattening and beading, two pipes are taken from the batch.

To check the chemical composition, one pipe is selected from the batch.

2.7. Each pipe is subjected to a hydraulic pressure test.

2.8. To test for hardness, 2% of the pipes (but not less than two) from the batch are tested.

2.9. The yield strength and Brinell hardness of group B steel are determined at the request of the consumer.

2.10. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double sample from the same batch.

The retest results apply to the entire lot.

2.11. Each pipe of group B is subjected to non-destructive testing from 01.01.90.

2.12. The sample size for ultrasonic testing and the norms of unacceptable defects are determined by agreement between the manufacturer and the consumer.

3. CONTROL METHODS

3.1. From each pipe selected from the batch, one sample is cut out.

3.2. Inspection of the pipe surface is carried out without the use of special instruments. The depth of defects is checked by sawing or otherwise.

The length of the pipes is controlled by a tape measure according to GOST 7502-89.

The curvature of the pipes is controlled by a straightedge, according to GOST 8026-92 and a probe according to TU 2-034-225-87.

The diameter and ovality are controlled with a smooth micrometer of the MK type according to GOST 6507-90, with sheet staples according to GOST 18362-73 - GOST 18366-73.

On pipes with a ratio of outer diameter D to wall thickness equal to 40 or more, the perimeter is controlled by ring gauges in accordance with GOST 24851-81. Micrometer control is allowed.

The wall thickness is checked with a pipe micrometer of the MT type according to GOST 6507-90.

It is allowed to carry out surface quality control with special devices according to normative and technical documentation^

3.3. Chemical analysis of pipe steel is carried out according to GOST

Samples for determining the chemical composition of pipe steel are taken according to GOST 7565-81.

It is allowed to use other methods of analysis that ensure the accuracy of the determination in accordance with the specified standards.

In case of disagreement in assessing the quality of products in terms of chemical composition, tests are carried out according to the specified standards.

3.4. The tensile test is carried out according to GOST 10006-80. The test speed to the yield point should be no more than 10 mm/min, beyond the yield point - no more than 40 mm/min.

It is allowed to control the mechanical properties of pipes by non-destructive control methods.

In case of disagreement in assessing the quality of products based on the results of determining the stretching, tests are carried out in accordance with GOST 10006-80.

3.5. The hardness test is carried out according to GOST 9012-59.

On pipes heat treated in continuous furnaces, the hardness test is carried out at both ends of the pipe.

It is allowed to determine the hardness on samples intended for tensile testing.

It is allowed to carry out hardness control by non-destructive methods according to normative and technical documentation. In case of disagreement in assessing the quality of products by determining the hardness, the test is carried out in accordance with GOST 9012-59.

3.6. Hydraulic testing of pipes is carried out in accordance with GOST 3845-75 with exposure under pressure for at least 10 s.

It is allowed to replace the hydraulic pressure test with the control of each pipe by non-destructive methods in accordance with GOST 17410-78.

3.7. The pipe bend test is carried out according to GOST 3728-78.

3.8. Pipe testing for expansion is carried out according to GOST 8694-75.

3.9. The pipe flattening test is carried out according to GOST 8695-75.

3.10. Pipe testing for beading is carried out according to GOST 8693-80.

3.11. The impact strength test is carried out according to GOST 9454-78 on U-shaped samples.

4. TRANSPORT AND STORAGE

Transportation and storage is carried out in accordance with GOST 80.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS