Among the assortment of pipes offered by Energocontrol, there are products designed to solve a wide range of tasks. For example, these are seamless pipes that are resistant to corrosion and are designed for operation in less than ideal conditions. Now in order to find an assortment supplier stainless pipes made in accordance with GOST 9940-81, you do not have to "surf" the Internet, because on the company's website you can always find up-to-date information and find interesting offers.

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GOST 9940-81 status

This standard applies to corrosion-resistant, seamless, hot-worked pipes. The wall thickness of the products varies from 3.5 to 32 mm, and the diameter is 57 to 325 mm. As for the length, it should not deviate more or less by more than 15 mm, although manufacturers often make products according to the parameters specified by the customer, but within the standard, with a multiplicity of 300 mm.

Hot-deformed pipes can be manufactured not only in accordance with GOST, but also in accordance with technical regulations. GOST 9940-81 is valid, and in the manufacture of products, any steel grades that fall under their standard can be used.

Application area

Cold-deformed pipe-rolling is endowed with greater strength, but hot-deformed pipe is characterized by plasticity and flexibility, and if the pipe is made of steel 20x23n18, this means one thing: the product is characterized by increased heat resistance, therefore, it can be used to create structures that will be constantly exposed to ultra-high temperatures. Hot-rolled pipes in accordance with GOST 9940-81, made from less heat-resistant grades steels, but not devoid of increased resistance to corrosion, can be used:

In mechanical engineering, shipbuilding and aircraft construction. Hot-rolled pipe products are often used to manufacture elements of engines, cooling systems and other units, inside of which there is a high risk of corrosion, temperature and pressure drops.
In the nuclear industry. Corrosion-resistant steel is especially in demand in this area, as well as rolled pipes made of such a material, which combines a whole list of positive properties. This is an increased resistance to aggressive environments, high strength characteristics and the absence of weld, which is very important, since it completely excludes the possibility of leakage of working solutions and other substances, which are often dangerous.
Chemical industry. You can distill any substances through seamless hot-rolled pipes without fear of leaks and other force majeure.
Energy and construction industry. If the heating system is created with the involvement of just such a pipe rolling, then there is no doubt about its reliability. Heat-resistant steel products are ideal for boiler construction high pressure, steam generators and other installations.
Other sectors of the economy. These include: oil and gas production and processing of minerals, as well as food, light and processing industries.

STATE STANDARD OF THE UNION OF SSR

Date of introduction 01.01.83

This standard applies to seamless hot-worked corrosion-resistant steel pipes for general use.

(Modified edition, Amendment No. 3).

1. VARIETY

1.1. Pipes are made according to the outer diameter and wall thickness with the dimensions indicated in.

1.2. The length of the pipe is made:

measured length - within the limits of unmeasured, but not more than indicated in with a maximum deviation in length + 15 mm; by agreement between the manufacturer and the consumer, it is allowed to manufacture measuring pipes with a length exceeding that specified in;

length that is a multiple of the measured length - within the measured length with an allowance for each cut of 5 mm and with a maximum deviation along the entire length of + 15 mm. The minimum multiple length is 300 mm;

limited length - within the measured with a maximum deviation in length ± 500 mm;

off-gauge length - from 1.5 to 10 m; by agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with a length of more than 10 m.

Outside diameter, mm	Length of measuring pipes, m, no more, with wall thickness, mm
Outside diameter, mm	3,5	4	4,5	5	5,5	6	6,5	7	7,5	8	8,5	9	9,5	10	11	12	13	14	15	16	17	18	19	20	22	24	25	26	28	30	32
57			By agreement of the manufacturer with consumer
60
68
73
76
83															By agreement between the manufacturer and the consumer
89
95
102
108
114
121
127
133
140
146
152
159																														By agreement between the manufacturer and the consumer
168															7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	3	3
180	-	-	-	-	-	-	-	-	-	8	8	7,5	7,5	7	7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
194	-	-	-	-	-	-	-	-	-	-	-	8	7,5	7	7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
219	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7,5	7	6,5	6,5	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
245	-	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7	7	6,5	6	5,5	5	4,5	5	4,5	4,5	-	-	-	-
273	-	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7	6,5	6	5,5	5,5	5	4,5	-	-	-	-	-	-	-
325	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	6,5	6	5,5	5	5	-	-	-	-	-	-	-	-	-	-	-

Notes:

1. Pipes made of steel grades 08Х17Т, 15Х28, 12Х17, 10Х17Н13М2Т are made with a diameter of not more than 219 mm; made of steel grade 08Х17Н15М3Т - with a diameter of not more than 140 mm, size 159´ 9 mm; from steel grade 10X23H18 - with a diameter of not more than 168 mm; from steel grades 08Х18Н12Б, 08Х22Н6Т, 08Х20Н14С2 - no more than 108 mm in diameter.

2. By agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with dimensions not specified in Art.

3. The mass of 1 m of pipes, kg, is calculated by the formula

WhereD n - nominal outer diameter, mm;

s - nominal wall thickness, mm;

- metal density, g / cm 3, depending on the steel grade in accordance with.

4. Pipes with a diameter of 76 to 95 mm with a wall thickness of 3.5 - 4.0 mm, a diameter of 133 to 152 mm, a wall thickness of 4.0-5.5 mm, a diameter of less than 76 mm will be manufactured after the equipment is mastered.

1.3. In a batch of pipes of unmeasured length, no more than 15% of pipes with a length of 0.75 to 1.5 m are allowed.

1.4. Limit deviations for the outer diameter and wall thickness are shown in table. 2.

Pipe dimensions	Limit deviations for manufacturing accuracy,%
Pipe dimensions	the usual	high
Outside diameter	± 1,5	± 1,0
Wall thickness, mm:
8 or less	+20,0	+12,5
8 or less	-15,0	-15,0
more than 8 to 20	± 15,0	+12,5
more than 8 to 20		-15,0
more than 20	+12,5
more than 20	-15,0	± 12,5

1.5. Ovality should not lead the pipe diameter beyond the limit deviations.

1.6. The curvature of pipes in any section with a length of 1 m should not exceed:

1.5 mm - along the wall thickness up to 10 mm inclusive;

2 mm - with a wall thickness of more than 10 to 20 mm inclusive;

4 mm - with wall thickness over 20 mm.

1.7. The ends of the pipes must be cut at right angles and deburred, chamfering is allowed when they are removed. At the request of the consumer, at the ends of pipes with a wall thickness of more than 5 mm, there must be a chamfer for welding.

Legend examples

A pipe with an outer diameter of 76 mm, a wall thickness of 5 mm, of normal manufacturing accuracy, of unmeasured length, from steel grade 08X18H10T:

Pipe 76´ 5 - 08Х18Н10Т GOST 9940-81

The same, high manufacturing accuracy (c), multiple length (cr) 1500 mm:

Pipe 76v´ 5c´ 1500cr - 08Х18Н10Т GOST 9940-81

The same, the usual manufacturing accuracy, measured length (m) 3000 mm:

Pipe 76´ 5 ´ 3000m - 08Х18Н10Т GOST 9940-81

The same, with the usual manufacturing accuracy, measuring length 3000 mm with the remainder:

Pipe 76´ 5 ´ 3000 - 08Х18Н10Т GOST 9940-81

The same, high manufacturing accuracy (c), limited length (og) 3000 mm:

Pipe 76v´ 5c´ 3000g - 08Х18Н10Т GOST 9940-81

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technical regulations approved in the prescribed manner, from steel grades specified in

15X28

441(45)

7,60

15X25T

441(45)

7,60

04X18H10

441(45)

7,90

10X23H18

491(50)

7,95

08Х17Н15М3Т

510(52)

8,10

08X18H10

510(52)

7,90

08X18H10T

510(52)

7,90

08Х18Н12Б

510(52)

7,90

08Х18Н12Т

510(52)

7,95

08Х20Н14С2

510(52)

7,70

10Х17Н13М2Т

529(54)

8,00

12X18H9

529(54)

7,90

12Х18Н10Т

529(54)

7,90

12Х18Н12Т

529(54)

7,95

17Х18Н9

568(58)

7,90

08Х22Н6Т

588(60)

7,60

Notes:

1. For pipes with a ratioD n / S equal to or less than 8 of steel grades 04X18H10, 08X20H14S2, 10X17H13M2T, 08X18H12T, 10X23H18, 08X18H10, 08X18H10T, 08X17H15M3T, 12X18H10T, 12X18H12T, 12X18H9, 17X18H9, 17X18H9, 17X18H9, 17X18H9 mm 2).

2. At the request of the consumer, for pipes made of steel grades 12X18H10T, 12X18H12T, 08X18H10T, the yield point is determined.

3. The yield point for steel grade 12X18H10T must be at least 216.0 N / mm 2 (22 kgf / mm 2).

4. The norms of the yield point for steel grades 12X18H12T and 08X18H10T are established by agreement between the manufacturer and the consumer.

(Changed edition, Amendments No. 1, 2, 3, 4).

2.3. At the request of the consumer, pipes must withstand a tensile test at a temperature of 623 K (350 ° FROM).

The norms of ultimate tensile strength and yield strength are established by agreement between the manufacturer and the consumer.

(Modified edition, Amendments No. 1, 3).

2.4. Captivity, flaws, sunsets, cracks are not allowed on the outer and inner surfaces of pipes. It is allowed to remove defects by local cleaning, continuous or local grinding, boring and turning, provided that the amount of boring, turning or continuous grinding does not bring the diameter and wall thickness beyond the minus deviations, and local stripping or grinding - the wall thickness outside the minus deviations indicated in .

Single captivity, ripples, risks, traces of indentation of scale are allowed without stripping, provided that they do not remove the wall thickness beyond the minus limit deviations.

At the request of the consumer, single caps must be cleaned.

(Modified edition, Amendment No. 2).

2.5. At the request of the consumer, pipes are made free of scale.

2.6. At the request of the consumer, pipes must withstand hydraulic pressure R 1 in accordance with the requirements of GOST 3845 with an allowable stress equal to 40% of the ultimate tensile strength for a given steel grade.

The ability of pipes to withstand hydraulic pressure is ensured by manufacturing technology.

2.7. At the request of the consumer, pipes made of steel grades 04X18H10, 08X20H14C2, 10X17H13M2T, 08X18H12B, 10X23H18, 08X18H10, 08X18H10T, 08X18H12T, 08X17H15M3T, 12X18H10T, 12X18H12T, 12X18H9 H), mm, calculated by the formula

Where s- nominal wall thickness, mm;

D- nominal outer diameter, mm,

or expansion to increase the outer diameter by 10% with a mandrel with a taper angle of 30 ° ; it is allowed to use mandrels with a taper angle of 6 and 12 ° .

2.8. At the request of the consumer, as indicated in the order, pipes made of steel grades 10X17H13M2T, 08X17H15M3T, 08X22H6T, 04X18H10, 08X18H10, 08X18H10T, 12X18H10T, 12X18H9, 08X18H12T, 12X18H12T, 08X18N12B must be resistant to intergranular corrosion.

2.9. At the request of the consumer, ultrasound control must be carried out. The size of the artificial defect is established by agreement between the manufacturer and the consumer.

3. RULES OF ACCEPTANCE

3.1. Pipes are accepted in batches. A batch should consist of pipes of the same size in terms of diameter and wall thickness, one steel grade and one type of heat treatment, and at the request of the consumer - one heat and be issued with one quality document for a pipe billet.

The number of pipes in a batch should be no more than 200 pcs.

3.2. Control of surface, dimensions, hydraulic pressure, each pipe is subjected to ultrasonic testing.

3.3. For quality control, the following are selected from the batch:

two pipes - in tension;

one pipe - for flattening or expansion;

two pipes - for intergranular corrosion.

When unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on a double number of pipes selected from the same batch.

Retest results apply to the entire batch.

(Modified edition, Amendment No. 4)

3.4. Deleted (Amendment No. 4)

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

4.2. Inspection of the pipe surface is carried out visually.

4.3. The length of the pipes is checked with a tape measure in accordance with GOST 7502.

(Modified edition, Amendment No. 4)

4.4. The curvature of the pipes is checked with a straight edge in accordance with GOST 8026 and a probe in accordance with regulatory documents.

(Modified edition, Amendments No. 3, 4).

4.5. The outer diameter and ovality are controlled with a smooth micrometer of the MK type in accordance with GOST 6507, sheet brackets in accordance with GOST 18360, GOST 18365.

The wall thickness is controlled with a pipe micrometer of the MT type in accordance with GOST 6507.

(Modified edition, Amendment No. 4)

4.6. The tensile test is carried out in accordance with GOST 10006, GOST 19040 (at a temperature of 623 K).

The speed of movement of the movable grip is no more than 10 mm per minute. It is allowed to exceed the test speed up to 40 mm per 1 min after reaching the yield point.

It is allowed to control the mechanical properties by the hardness method according to the normative and technical documentation.

In case of disagreement in the assessment of the results, the tests are carried out according to GOST 10006.

(Modified edition, Amendment No. 1).

4.7. The expansion test is carried out on pipes with a diameter of up to 146 mm inclusive with a wall thickness of no more than 10 mm in accordance with GOST 8694.

(Modified edition, Amendment No. 1).

4.8. The flattening test is carried out on pipes with a wall thickness of no more than 10 mm in accordance with GOST 8695.

If small defects are found on flattened samples, which are the result of external defects allowed without cleaning, the sample is retested from the same pipe with preliminary cleaning of the surface to a depth of maximum deviations in the wall thickness, but not more than 0.2 mm from the side on which they were found. defects.

4.9. The hydraulic pressure test is carried out in accordance with GOST 3845 with holding the pipes under a pressure of at least 10 s.

4.9.1. Instead of testing by hydraulic pressure, it is allowed to control each pipe by non-destructive methods in accordance with GOST 17410 and regulatory and technical documentation from 01.01.90.

(Introduced additionally, Amendment No. 1).

4.10. Ultrasonic testing is carried out in accordance with GOST 17410 and regulatory and technical documentation.

4.11. The check of resistance against intergranular corrosion is carried out by the AM or AMU methods according to GOST 6032. In case of disagreement in the assessment of the results, the check is carried out by the AM method.

By agreement between the manufacturer and the consumer, it is allowed to check the resistance against intergranular corrosion of steels of grades 12X18H10T and 08X18H10T using the PT method GOST 9.914. In case of disagreement in the assessment of the results, the check is carried out by the AM method in accordance with GOST 6032.

(Modified edition, Amendment No. 4)

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage - in accordance with GOST 10692.

INFORMATION DATA

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

DEVELOPERS

V.P. Sokurenko(topic leader), L.G. Kovaleva, V.N. Rovensky, G.A. Gorovenko

2. APPROVED AND COMMITTED INTO ACTION Decree of the State Committee of the USSR for standards of 20.07.81 No. 3445

3. Inspection frequency - 5 years

4. REPLACE GOST 9940-72

5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

6. The limitation of the validity period was lifted according to the Protocol of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)

7. REPUBLICATION with Changes No. 1, 2, 3,4, approved in June 1987, June 1988, August 1988, April 2001. (IUS 11-87, 9-88, 12-88, 7-2001 )

Seamless products are made from steel 12X18H10T in accordance with GOST 9940-81. It applies to hot-deformed tubular products made from corrosion-resistant alloys for general purposes.

GOST 9940 stainless steel pipes are manufactured:

with a diameter (outer) from 57 to 325 mm;
with wall thickness from 3.5 to 32 mm;
standard maximum length from 3 to 8.5 m

In terms of manufacturing accuracy, pipes are produced with ordinary accuracy and with high accuracy. Other geometrical dimensions and physical and mechanical properties, which are described below, determined for pipes 12X18H10T GOST 9940 and other tolerances for wall thickness, diameter and curvature.

The same requirements are imposed on the chemical composition of the steel of seamless products of this standard as for those produced in accordance with GOST 9941. And their mass is calculated using the same formula. The requirements for pipe ends and surface are also identical. Products are manufactured in accordance with the submitted order, heat treated or without heat treatment and resistant to intergranular corrosion. At the request of the customer, pipes are subjected to the same tests as those produced in accordance with GOST 9941, and using similar methods and conditions for their implementation.

Here the only difference is that for hot-deformed pipes GOST 9940, their heat treatment is not a prerequisite for achieving the required physical and mechanical properties and conducting the necessary tests. After all, the method of manufacturing these products already presupposes the necessary heat treatment, which cannot be said about cold and heat-deformed products of GOST 9941.

Hot-deformed ones have greater flexibility and plasticity, but they are significantly inferior to cold- and heat-deformed ones in strength and resistance to physical stress exerted on them.

In addition, for hot-deformed pipes 12X18H10T with a ratio of diameter to wall thickness equal to or less than 8, a decrease in tear resistance by 2 kgf / mm2 (19.6 N / mm2) is allowed. Products of GOST 9941 must withstand the rated load regardless of the geometric parameters of their section. Only the yield point for hot-deformed pipes is the same - 22 kgf / mm2 (216 MPa). But this is due to the fact that the same stainless alloy is used for manufacturing - 12X18H10T.

Due to the greater strength, GOST 9941 pipes are made with smaller wall thicknesses and diameters than products of standard 9940. If we compare, for example, products with a diameter of 273, then cold and heat-deformed ones are produced with walls of 3-14 mm, and hot-deformed ones - 11-20 mm ... Accordingly, the areas of application of GOST 9941 and 9940 products are somewhat different. The first is used where high strength of the pipeline or product is needed with its relative lightness, and the second, when the flexibility and ductility of the pipe from which they are made is more important when installing and operating a stainless network or part.

This standard applies to seamless hot-worked corrosion-resistant steel pipes for general use.

Designation:	GOST 9940-81 *
Russian name:	Seamless hot-deformed pipes made of corrosion-resistant steel. Technical conditions
Status:	acting
Replaces:	GOST 9940-72
Date of text update:	01.10.2008
Date added to the database:	01.02.2009
Effective date:	01.01.1983
Designed by:	Ministry of Ferrous Metallurgy of the USSR
Approved by:	Gosstandart of the USSR (20.07.1981)
Published:	IPK Standards Publishing House No. 1998 IPK Standards Publishing House No. 2004

STATE STANDARD OF THE UNION OF SSR

Date of introduction 01.01.83

This standard applies to seamless hot worked pipes made from corrosion-resistant steel for general use.

(Modified edition, Amendment No. 3).

1. VARIETY

1.1. Pipes are made according to the outer diameter and wall thickness with the dimensions indicated in.

1.2. The length of the pipes is made:

a multiple of length - within the measured length with an allowance for each cut of 5 mm and with a maximum deviation along the entire length of + 15 mm. The minimum multiple length is 300 mm;

limited length - within the measured with a maximum deviation in length ± 500mm;

off-gauge length - from 1.5 to 10 m; by agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with a length of more than 10 m.

Outside diameter, mm	Length of measuring pipes, m, no more, with wall thickness, mm
Outside diameter, mm	3,5	4	4,5	5	5,5	6	6,5	7	7,5	8	8,5	9	9,5	10	11	12	13	14	15	16	17	18	19	20	22	24	25	26	28	30	32
57			By agreement of the manufacturer with consumer
60
68
73
76
83
89
95
102
108
114
121
127
133
140
146
152
159																														By agreement between the manufacturer and the consumer
168													7,5	7	7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	3	3
180	-	-	-	-	-	-	-	-	-	8	8	7,5	7,5	7	7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
194	-	-	-	-	-	-	-	-	-	-	-	8	7,5	7	7	6,5	6,5	6,5	6	6	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
219	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7,5	7	6,5	6,5	5,5	5,5	5	4,5	4,5	4,5	4	3,5	3,5
245	-	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7	7	6,5	6	5,5	5	4,5	5	4,5	4,5	-	-	-	-
273	-	-	-	-	-	-	-	-	-	-	-	-	-	-	8	8	7,5	7	6,5	6	5,5	5,5	5	4,5	-	-	-	-	-	-	-
325	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	6,5	6	5,5	5	5	-	-	-	-	-	-	-	-	-	-	-

Notes:

1. Pipes made of steel grades 08X17T, 15X28, 12X17, 10X17H13M2T are made with a diameter of no more than 219 mm; made of steel grade 08Х17Н15М3Т - with a diameter of not more than 140 mm, size 159´ 9 mm; from steel grade 10X23H18 - with a diameter of not more than 168 mm; from steel grades 08Х18Н12Б, 08Х22Н6Т, 08Х20Н14С2 - no more than 108 mm in diameter.

2. By agreement between the manufacturer and the consumer, it is allowed to manufacture pipes with dimensions not specified in Art.

3. The mass of 1 m of pipes, kg, is calculated by the formula

WhereD n - nominal outer diameter, mm;

s - nominal wall thickness, mm;

- metal density, g / cm 3, depending on the steel grade in accordance with.

4. Pipes with a diameter of 76 to 95 mm with a wall thickness of 3.5 - 4.0 mm, a diameter of 133 to 152 mm with a wall thickness of 4.0-5.5 mm, a diameter of less than 76 mm will be manufactured after the equipment is mastered.

1.3. In a lot of pipes of unmeasured length, no more than 15% of pipes with a length of 0.75 to 1.5 m are allowed.

1.4. Limit deviations for the outer diameter and wall thickness are indicated in table. 2.

Pipe dimensions	Limit deviations for manufacturing accuracy,%
Pipe dimensions	the usual	high
Outside diameter	± 1,5	± 1,0
Wall thickness, mm:
8 or less	+20,0	+12,5
8 or less	-15,0	-15,0
more than 8 to 20	± 15,0	+12,5
more than 8 to 20		-15,0
more than 20	+12,5
more than 20	-15,0	± 12,5

1.5. Ovality should not take the pipe diameter out of the limit deviations.

1.6. The curved pipe on any section 1 m long should not exceed:

1.5 mm - wall thickness up to 10 mm inclusive;

2 mm - in the thickness of the wall over 10 to 20 mm inclusive;

4 mm - with wall thickness over 20 mm.

1.7. The ends of the pipes must be cut at right angles and deburred, chamfering is allowed when they are removed. At the request of the consumer, at the ends of the pipes with a wall thickness of more than 5 mm, there must be a bevel for welding.

Examples of conventions

A pipe with an outer diameter of 76 mm, a wall thickness of 5 mm, of normal manufacturing accuracy, of unmeasured length, made of steel grade 08X18H10T:

Pipe76´ 5- 08X18H10T GOST 9940-81

The same, high-precision manufacturing (c), multiple length (cr) 1500 mm:

Pipe76v´ 5c´ 1500kr- 08X18H10T GOST 9940-81

The same, usual manufacturing accuracy, measured length (m) 3000 mm:

Pipe76´ 5 ´ 3000m- 08X18H10T GOST 9940-81

The same, usual manufacturing accuracy, measured length 3000 mm with the remainder:

Pipe76´ 5 ´ 3000- 08X18H10T GOST 9940-81

The same, high-precision manufacturing (c), limited length (og) 3000 mm:

Pipe76v´ 5c´ 3000g- 08X18H10T GOST 9940-81

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technical regulations approved in the established manner, from steel grades specified in chemical composition by GOST 5632, with microadditives of rare earth metals.

Pipes are made heat-treated or without heat-treatment in accordance with the order.

(Modified edition, Amendments No. 1, 4).

2.2. The mechanical properties of pipes must correspond to those indicated in table. 3.

steel grade	Temporary resistance
steel grade	12X17	441(45)	17	7,70
15X28	441(45)	17	7,60
15X25T	441(45)	17	7,60
04X18H10	441(45)	40	7,90
10X23H18	491(50)	37	7,95
08Х17Н15М3Т	510(52)	35	8,10
08X18H10	510(52)	40	7,90
08X18H10T	510(52)	40	7,90
08Х18Н12Б	510(52)	38	7,90
08Х18Н12Т	510(52)	40	7,95
08Х20Н14С2	510(52)	35	7,70
10Х17Н13М2Т	529(54)	35	8,00
12X18H9	529(54)	40	7,90
12Х18Н10Т	529(54)	40	7,90
12Х18Н12Т	529(54)	40	7,95
17Х18Н9	568(58)	40	7,90
08Х22Н6Т	588(60)	24	7,60

Notes:

2. At the request of the consumer, for pipes made of steel grades 12X18H10T, 12X18H12T, 08X18H10T, the yield point is determined.

3. The yield point for steel grade 12X18H10T must be at least 216.0 N / mm 2 (22 kgf / mm 2).

4. The norms of the yield point for steel grades 12X18H12T and 08X18H10T are established by agreement between the manufacturer and the consumer.

(Changed edition, Amendments No. 1, 2, 3, 4).

2.3. The pipes must withstand the tensile test at a temperature of 623 K (350 ° FROM).

The norms of tensile strength and yield strength are established by agreement between the manufacturer and the consumer.

(Changed edition, Amendments No. 1, 3).

2.4. Captivity, flaws, sunsets, cracks are not allowed on the outer and inner surfaces of the pipes. It is allowed to remove defects by local cleaning, continuous or local grinding, boring and turning, provided that the amount of boring, turning or continuous grinding does not bring the diameter and wall thickness beyond the minus deviations, and local stripping or grinding - the wall thickness beyond the minus deviations specified in Art.

Without stripping, single captivity, ripples, risks, traces of indentation of scale are allowed, provided that they do not remove the wall thickness beyond the minus limit deviations.

At the request of the consumer, single caps must be cleaned.

(Modified edition, Amendment No. 2).

2.5. According to the consumer's request, pipes are made free of scale.

2.6. The pipes must be able to withstand the hydraulic pressure as required by the consumer. R 1 in accordance with the requirements GOST 3845 with an allowable stress equal to 40% of the ultimate tensile strength for a given steel grade.

The ability of pipes to withstand hydraulic pressure is ensured by manufacturing technology.

2.7. To the consumer's demand, pipes made of steel grades 04X18H10, 08X20H14S2, 10X17H13M2T, 08X18H12B, 10X23H18, 08X18H10, 08X18H10T, 08X18H12T, 08X17H15M3T, 12X18H10T, 12X18H12T, 12X18H10, distances between H), mm, calculated by the formula

Where s- nominal wall thickness, mm;

D- nominal outer diameter, mm,

or expansion of the outer diameter by 10% with a mandrel with a taper angle of 30 ° ; it is allowed to use mandrels with a taper angle of 6 and 12 ° .

2.8 At the request of the consumer, which is indicated in the order, pipes made of steel grades 10X17H13M2T, 08X17H15M3T, 08X22H6T, 04X18H10, 08X18H10, 08X18H10T, 12X18H10T, 12X18H9, 08X18H12T, 12X18H12T, 08X18H12B must be resistant to corrosion.

2.9. The requirement of the consumer must undergo ultrasound control. The size of the artificial defect is established by agreement between the manufacturer and the consumer.

3. RULES OF ACCEPTANCE

3.1. Pipes are accepted in batches. A batch should consist of pipes of the same size in terms of diameter and wall thickness, one steel grade and one type of heat treatment, and at the request of the consumer - one melt and be issued with one document of quality for a pipe billet.

The number of pipes in a batch should be no more than 200 pcs.

3.2. Each pipe is tested for surface, dimensions, hydraulic pressure, and ultrasonic testing.

3.3. For quality control, the following are selected from the batch:

two pipes - tension;

one pipe for flattening or expansion;

two pipes - intergranular corrosion.

When unsatisfactory test results are obtained for at least one of the indicators, re-tests are carried out on a doubled number of pipes selected from the same batch.

Retest results apply to the entire batch.

(Modified edition, Amendment No. 4)

3.4. Deleted (Amendment No. 4)

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

4.2. Inspection of the pipe surface is carried out visually.

4.3. The length of the pipe is checked with a tape measure GOST 7502.

(Modified edition, Amendment No. 4)

4.4. The curved pipe is checked with a straightedge in accordance with GOST 8026 and a probe according to the normative documentation.

(Modified edition, Amendments No. 3, 4).

4.5. The outer diameter and ovality are controlled with a smooth micrometer of the MK type in accordance with GOST 6507, with sheet brackets in accordance with GOST 18360, GOST 18365.

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

(Modified edition, Amendment No. 4)

4.6. The tensile test is carried out according to GOST 10006, GOST 19040 (at a temperature of 623 K).

The speed of movement of the movable gripper is no more than 10 mm per 1 min. It is allowed to exceed the test speed up to 40 mm per 1 min after reaching the yield point.

It is allowed to control the mechanical properties by the hardness method of the normative and technical documentation.

In case of disagreement in assessing the results of the test, carry out according to GOST 10006.

(Modified edition, Amendment No. 1).

4.7. The expansion test is carried out on pipes with a diameter of up to 146 mm inclusive with a wall thickness of no more than 10 mm in accordance with GOST 8694.

(Modified edition, Amendment No. 1).

4.8. The flattening test is carried out on pipes with a wall thickness of not more than 10 mm. GOST 8695.

If small defects are found in flattened samples, which are the result of external defects allowed without stripping, the sample is retested from the same pipe with preliminary cleaning of the surface to a depth of maximum deviations in the wall thickness, but not more than 0.2 mm from the side on which the defects were found.

4.9. The hydraulic pressure test is carried out according to GOST3845 with holding pipes under pressure not less than 10 s.

4.9.1. Instead of hydraulic pressure testing, it is allowed to control each pipe using non-destructive methods in accordance with GOST 17410 and standard technical documentation s01.01.90.

(Introduced additionally, Amendment No. 1).

4.10. Ultrasonic testing is carried out in accordance with GOST 17410 and regulatory and technical documentation.

4.11. Testing of resistance against intergranular corrosion is carried out by AM or AMU methods according to GOST6032. In case of disagreement in the assessment of the results, the check is carried out by the AM method.

By agreement between the manufacturer and the consumer, it is allowed to check the resistance against intergranular corrosion of steels of grades 12X18H10T and 08X18H10T by the PT method GOST 9.914. In case of disagreement in the assessment of the results, the check is carried out by the AM method in accordance with GOST 6032.

(Modified edition, Amendment No. 4)

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage - according to GOST 10692.

INFORMATION DATA

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

DEVELOPERS

V.P. Sokurenko(topic leader), L.G. Kovaleva, V.N. Rovensky, G.A. Gorovenko

2. APPROVED AND INTRODUCED INTO ACTION Resolution of the USSR State Committee for Standardization 20.07.81 No. 3445

3. Frequency of verification - 5 years

4. REPLACE GOST 9940-72

5. REFERENCE REFERENCE DOCUMENTS

	Item number	Designation of NTD referenced	Item number
GOST 3845-75	2.6, 4.9	GOST 8695-75	4.8
GOST 5632-72	2.1	GOST 10006-80	4.6
GOST 6032-89	4.11	GOST 10692-80	3.1, 5.1
GOST 6507-90	4.5	GOST 17410-78	4.9.1, 4.10
GOST 7502-89	4.3	GOST 18360-93	4.5
GOST 8026-92	4.4	GOST 18365-93	4.5
GOST 8694-75	4.7	GOST 19040-81	4.6
		TU 2-034-225-87	4.4

6. The limitation of the validity period was lifted according to the Protocol of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)

7. REPUBLICATION with changes No. 1, 2, 3,4, approved in June 1987, June 1988, August 1988, April 2001. (IUS 11-87, 9-88, 12-88, 7-2001)