GOST 9941-81 cold and hot-deformed seamless pipes of corrosion resistant steel.pdf

RUSSIAN INDUSTRY STANDARDS

GOST 9941-81

COLD AND HOT-DEFORMED SEAMLESS PIPES OF CORROSIONRESISTANT STEEL ГОСТ 9941-81 ТРУБЫ БЕСШОВНЫЕ ХОЛОДНО- И ТЕПЛОДЕФОРМИРОВАННЫЕ ИЗ КОРРОЗИОННОСТОЙКОЙ СТАЛИ

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GOST 9941-81, COLD AND HOT-DEFORMED CORROSION-RESISTANT STEEL SOURCE DOCUMENT

SEAMLESS

PIPES

OF

TRANSLATION

Index and title in the language of origin:

ГОСТ 9941-81 «ТРУБЫ БЕСШОВНЫЕ ХОЛОДНО- И ТЕПЛОДЕФОРМИРОВ АННЫЕ ИЗ КОРРОЗИОННОСТОЙ КОЙ СТАЛИ»

Index and title:

GOST 9941-81, COLD AND HOT-DEFORMED SEAMLESS PIPES OF CORROSION-RESISTANT STEEL

Document type:

Regional standard

Translated and annotated by:

SNIP REGISTER, INC. http://www.snip.com

Document status:

Published document

Published by:

SNIP REGISTER, INC. http://www.snip.com

Effective date:

1983-01-01

Date of publication/update:

2002-06-01

Replaces:

GOST 9941-72

Publication format:

PDF

Replaced by:

Not applicable

ISBN:

Withdrawal date:

Not applicable

Latest revision/amendment incorporated in translation:

Issuing body:

USSR Gosstandart

Original language:

Russian

AMD 5, June 2001 Correction 2002

ICS:

Disclaimer of Warranty and Limitation of Liability (A) THIS PUBLICATION IS THE TRANSLATION OF THE DOCUMENT THAT WAS INITIALLY DEVELOPED IN THE LANGUAGE OF ORIGIN (“ORIGINAL DOCUMENT”). SNIP REGISTER, INC. ("SNIP") HAS MADE REASONABLE EFFORTS TO ENSURE THAT INFORMATION CONTAINED IN THIS PUBLICATION ("INFORMATION”) IS AN ACCURATE REPRESENTATION OF THE LANGUAGE AND TERMINOLOGY OF THE ORIGINAL DOCUMENT. HOWEVER, NEITHER SNIP NOR ITS AFFILIATES, ANY OF THEIR RESPECTIVE EMPLOYEES, DIRECTORS, OFFICERS, AGENTS, CONTRACTORS, THIRD PARTY CONTENT PROVIDERS, OR LICENSERS WARRANT THAT THE INFORMATION CONTAINED HEREIN WILL BE COMPLETE, ERROR FREE, OMISSION FREE, OR THAT THE RESULTS OBTAINED THEREFROM WILL BE USEFUL OR WILL SATISFY THE REQUIREMENTS OF PERSONS WHO ACCESS, DIRECTLY OR INDIRECTLY, AND/OR USE THE INFORMATION ("USERS"). THIS PUBLICATION IS PROVIDED ON AN "AS IS" BASIS WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED; THE INFORMATION MAY BE USED AT USERS' SOLE RISK FOR COMMUNICATIONAL AND/OR REFERENCE PURPOSES ONLY AND AS A SUPPLEMENT TO AND IN CONJUNCTION WITH APPLICABLE PROVISIONS AND REQUIREMENTS OF THE STATUTORY AND REGULATORY DOCUMENTS ISSUED AND ENFORCED BY THE AUTHORITIES HAVING JURISDICTION. FOR THE SOLE PURPOSE OF ASSISTING USERS, THIS PUBLICATION MAY USE ITS OWN NAVIGATIONAL, ORGANIZATIONAL, INFORMATORY, EXPLANATORY, AND/OR OTHER ELEMENTS, WHICH SHOULD NOT BE CONSIDERED IN ANY SENSE AS THE OFFICIAL WORDING OR INTERPRETATION OF THE ORIGINAL DOCUMENT. (B) IN NO EVENT WILL SNIP, ITS AFFILIATES, ANY OF THEIR RESPECTIVE EMPLOYEES, DIRECTORS , OFFICERS, AGENTS, CONTRACTORS, SUBCONTRACTORS, THIRD PARTY CONTENT PROVIDERS, LICENSERS, OR ANY PERSON OR ENTITY INVOLVED IN CREATING, PRODUCING, OR DISTRIBUTING THIS PUBLICATION, SHALL BE LIABLE, REGARDLESS OF THE CAUSE OR DURATION, FOR ANY ERRORS, INACCURACIES, OMISSIONS, OR OTHER DEFECTS IN, OR INCOMPLETENESS OR UNTIMELINESS OF, THE INFORMATION CONTAINED HEREIN, OR FOR ANY CLAIMS OR LOSSES ARISING THEREFROM OR OCCASIONED THEREBY, OR ARISING OUT OF THE USE OF OR INABILITY TO USE THIS PUBLICATION AND INFORMATION CONTAINED HEREIN. NONE OF THE FOREGOING PARTIES SHALL BE LIABLE FOR ANY CLAIMS OR LOSSES OF ANY NATURE, INCLUDING, BUT NOT LIMITED TO, LOST PROFITS AND/OR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES.

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CONTENTS 1.

STANDARD SIZES...............................1

2.

TECHNICAL REQUIREMENTS............ 5

3.

ACCEPTANCE......................................8

4.

TEST METHODS ..................................9

5.

IDENTIFICATION, PACKAGING, TRANSPORTATION, AND STORAGE

III

11


PREFACE This standard shall apply to cold and hot-deformed seamless pipes of corrosion-resistant steel for general use. (Revised edition, Revision No. 2)

CYRILL IC-LATIN TRANSLITERATION TABL E Russian

English

Russian

English

А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ ъ Ы ь Э Ю Я

A

а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ ы ь э ю я

a

B V G D E Yo Zh Z I Y K L M N O P R S T U F Kh Ts Ch Sh Shch hard sign Y soft sign E Yu Ya

IV

b v g d e, ye, je yo zh z i y k l m n o p r s t u f kh ts ch sh shch hard sign y soft sign e yu ya


1.

STANDARD SIZES 1.1. The outside diameters and gauges of all manufactured pipes shall conform to Table 1. 1.2. All manufactured pipes shall have cut lengths (standard lengths), multiple lengths, and random lengths.

Cut lengths. Cut-length pipes shall be manufactured within the range of random lengths not to exceed those in Table 1 with a maximum length deviation of +15 mm. Upon the customer’s request, pipes shall be permitted to have the length exceeding that in Table 1.

Multiple lengths. Multiple-length pipes shall be manufactured within the range of cut lengths with a cutting allowance of 5 mm and maximum deviation of +15 mm to the total length of a pipe. The minimum multiple length shall be 300 mm.

Random lengths. The gauge of random-length pipes shall not exceed 0.5 mm, whereas the minimum length shall be 0.75 m and the maximum as provided in Table 1. Pipes with the gauge of 0.5 to 1 mm shall have a minimum length of 1.0 m and a maximum as provided in Table 1. Pipes with the gauge of 1.0 mm or more shall be 1.5 to 12.5 m in length. Upon the customer’s request, pipes shall be manufactured with lengths exceeding 12.5 m. Upon the customer’s request, the manufactured length of the pipes of less than 25 mm in diameter shall be permitted to exceed 16 m. (Revised edition, Revision No. 2)

TABLE 1 E d i t o r i a l N o t e : See

insert(s) for Table 1 and citation marks.

TABLE 1 -- PAGE A [1] =

outside diameter (mm)

[2] =

length of a pipe (m) for a gauge (mm), not more than

TABLE 1 -- PAGE B [1] =

outside diameter (mm)

[2] =

length of a pipe (m) for a gauge (mm), not more than

T a b l e 1 - N o t e 1 . Requirements for thing-gauge pipes with D / s > 40 in part of technical performance and ultimate dimensional deviations shall be determined from applicable standards.

T a b l e 1 - N o t e 2 . The outside diameter of the pipes of steel grades 12x17, 08x17T, 15x25T shall not be less than 21 mm. The pipes made from 06xN28MDT alloy shall have an outside diameter of 14 through 85 mm and gauge of 1 through 5 mm. T a b l e 1 - N o t e 3 . The weight (kg) per linear meter shall be determined by the following fomula: M = π / 1,000 (D - s) s ρ Where: D

=

nominal outside diameter (mm).

S

=

nominal gauge (mm).

ρ =

steel density (g/cm3) according to steel grade determined from Table 3.

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1.3. A single bundle of random-length pipes shall include not more than 6% of the pipes having the following lengths: •

0.5 m to 0.75 m when the gauge is less than 0.5 mm.

•

0.75 to 1 m when the gauge is 0.5 mm to 1 mm.

•

0.75 to 1,5 m when the gauge is 1 mm and more.

(Revised edition, Revision No. 1)

1.4. The maximum deviations of outside diameters and gauges shall not exceed those specified in Table 2. Upon the customer’s request, the deviation data for various diameters and gauges shall be permitted to be mixed.

TABLE 2 Maximum deviations within the fabrication precision

Pipe dimensions (mm) Regular precision

High precision

Higher precision

By outside diameter: With diameter 0.5 to 10

±0.3 mm

±0.2 mm

±0.15 mm

10 to 30

±0.4 mm

±0.3 mm

±0.2 mm

30 to 95

±1.2%

±1.0%

±0.8%

more than 95

±1.0%

±1.0%

±0.8%

0.2 mm

±0.05 mm

±0.03 mm

-

0.3 to 0.4

±0.07 mm

±0.05 mm

-

0.5 to 0.6

±0.10 mm

±0.07 mm

-

0.7 to 1

±0.15 mm

±0.10 mm

-

+12.5

±12.5%

+12.5

By gauge: With gauge

1 to 3

-15%

3 to 7

±12.5%

-10.0% +12.5

±10%

-10.0% more than 7

+12.5 -10.0

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±10%

-


TABLE 2 (CONTINUED) Maximum deviations within the fabrication precision

Pipe dimensions (mm)

Regular precision

Higher precision

Pipe dimensions from Table 1 (indicated by a heavy line) By outside diameter:

±1.2%

±1%

±15%

12.5

By gauge -With gauge 1.5 to 2,5

-15.0 2.5 to 4

+12.5

+12.5

-15 % Pipes manufactured from steel grade 06XN28MDT By outside diameter: With diameter up to 30

±0.45

more than 30

±1.2%

With gauge

-

up to 3

±15.0%

more than 3

±12.5%

-

1.5. Upon the customer’s request, the inside diameter and gauge shall be permitted to be used as a manufacturing parameter. The maximum deviations from inside diameters shall be specified by the customer.

1.6. The maximum deviations from the outside diameter of a pipe shall not be exceeded due to out-ofroundness of the pipe.

1.7. The pipe curvature of any given section of 1m in length shall not exceed: •

1 mm for pipes with 5 mm or more in diameter and gauge of 5 mm or more.

•

2 mm for pipes with the diameter of more than 15 mm and gauge of less than 0.5 mm.

For pipes of less than 15 mm in diameter with less than 0.5 mm gauge, the curvature shall not be specified provided that such pipes shall not have sharp bends.

1.8. The end faces of pipes shall be cut at a 90° angle and smoothed out of burrs. Formation of a chamfer and surface roughness shall be permitted, subject to removal thereof. Upon the customer’s request, the end faces of pipes with more than 5 mm gauge shall have a chamfer for welding.

INDEXING EXAMPLES A regular quality random length 2 mm gauge pipe with the outside diameter of 25 mm manufactured from 12X18N10T grade steel: Pipe 25 x 2 -- 12X18N10T GOST 9941-81

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A high quality (v) 2 mm gauge pipe with the outside diameter of 25 mm and a length multiple of 1,000 mm (kr ): Pipe 25v x 2v x 1000 kr --12X18N10T GOST 9941-81 A regular quality 2 mm gauge pipe with the outside diameter of 25 mm and cut length ( m) of 3,000 mm: Pipe 25 x 2 x 3000 m --12X18N10T GOST 9941-81 A higher quality 2 mm gauge pipe (p) with the outside diameter of 25 mm and cut length ( m) of 3,000 mm: Pipe 25p x 2p x 3000m -- 12X18N10T GOST 9941-81 A high quality (v) 2 mm gauge pipe with the outside diameter of 25 mm and a length of 3,000 mm manufactured by the inside diameter ( vn) and gauge. Pipe vn 25v x 2v x 3000m -- 12X18N10T GOST 9941-81 (Revised edition, Revision No. 2, 5, Correction)

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2.

TECHNICAL REQUIREMENTS 2.1. Manufactured pipes shall comply with this standard and approved regulations. (Revised edition, Revision No. 2)

2.2. Pipes shall be manufactured from steel grades specified in Table 3. Chemical compositions of steel grades in accordance with GOST 5632. Rare-earth metal additives shall be permitted. The sulfur content in steel for pipes subjected to welding, which shall be specified in the order, shall not exceed 0.02%. (Revised edition, Revision No. 3, 5)

2.3. Pipes shall be thermally treated. Upon the customer’s request, pipes shall be permitted to be manufactured without thermal treatment and surface clarification. Mechanical properties and curvature specifications shall be provided by the customer.

2.4. Mechanical properties of the pipes shall be determined from Table 3. Yield point for pipes manufactured from steel of grade 12X18N1OT shall not be less than 216 N/mm 2 (22 kgf/ mm2). The specified yield point for pipes manufactured from steel grades 12X18N12T, 10X17N13M2T, and 08X18N10T shall be established by agreement between the manufacturer and the customer. E d i t o r i a l N o t e 1 : Kgf

= kilogram-force, an obsolete measurement unit that is still used in engineering practices in Russia. The use of kgf in construction is allowed but not recommended by the federal building authorities (SN 528-80). 1 kgf = 9.80665 N

The specified yield point for pipes manufactured from steel grades 12X18N10T, 10X18N12T, 10X17N13M2T, and 08X18N10T shall be provided by the customer. (Revised edition, Revision No. 3, 4, 5)

TABLE 3 Steel grade

Ultimate strength σb 2 2 N/mm (kgs/ mm )

Specific elongation δ5 (%)

Density ρ 3 (g/cm )

Not less 08x17T

372(38)

17

7.70

08X13

372(38)

22

7.70

12X13

392(40)

22

7.70

12X17

441(45)

17

7.70

15X25T

461(47)

17

7.60

04X18N10

490(50)

45

7.90

08X20N14C2

510(52)

35

7.70

10X17N13M2T

529(54)

35

8.00

08X18N12B

529(54)

37

7.90

10X23N18

529(54)

35

7.95

08X18N10

529(54)

37

7.90

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08X18N10T

549(56)

37

7.90

08X18N12T

549(56)

37

7.95

08X17N15M3T

549(56)

35

8.10

12X18N10T

549(56)

35

7.95

12X18N12T

549(56)

35

7.90

12X18N9

549(56)

37

7.90

17X18H9

568(58)

35

7.90

08X22H6T

588(60)

20

7.60

08XH28MDT

490(50)

30

7.96

2.5. Upon the customer’s request, pipes shall be tested for a tensile strength under the temperature of 350 ° C. The ultimate strength and yield point specifications shall be provided by the customer. (Revised edition, Revision No. 4)

2.6. The outside and inside surfaces of pipes shall be without scabs, tears, impressions, and cracks. Defects shall be removed by local dressing, high-velocity and local grinding, turning, and drilling provided that grinding, turning, and high-velocity dressing shall not reduce the specified diameter and gauge, whereas the local dressing and polishing shall not reduce the specified gauge as provided in Table 2. When dressing is not applied, no single scabs, marks, waviness, scratches, and cavities shall reduce the minimum gauge. Upon the customer’s request, single scabs shall be smoothed out. (Revised edition, Revision No. 3)

2.7. Pipe surfaces shall be bright. Matt gray finish shall be permitted as a result of fabrication method and steel grade. No surface etching shall be required when the thermal treatment in shielding gas or vacuum with surface iridescence.

2.8. Upon the customer’s request, pipes of steel grades 12X18N10T, 12X18N12T, 12X18N9, 17X18N9, 04X18N10, 08X20N14C2, 10X17N13M2T, 08X18N12B, 10X23N18, 08X18N10, 08X18N12Y, 08X17N15M3T, 06XN28MDT shall withstand flattening to a dimension H (mm) between flattened surfaces. N shall be calculated by the formula: N = 1.08 s / (0.08 + s/D) Where: s

=

nominal gauge (mm)

D

=

nominal outside diameter (mm) or expansion of outside diameter by 10% by a 30° cone mandrel. 6° and 12° cone mandrels shall be permitted.

2.9. Upon the customer’s request, the pipes shall withstand hydraulic pressures in compliance with GOST 3835 provided that the permitted tension shall equal 40% of the ultimate rupture strength. The fabrication technology shall provide for the strength of a pipe to withstand hydraulic pressures.

2.10. Upon the customer’s request, which shall be specified in the order, pipes manufactured from steel grades 10XN13M2T, 08X17N15M3T, 08X22N6T, 04X18N10, 08X18N10, 08X18N10T, 12X18N10T, 08X18N12T, 12X18N12T, 12X18N9, 08X18N12B, and from 06XN28MDT alloy shall not develop intercrystalline corrosion.

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2.11. Upon the customer’s request, the pipe shall be subjected to ultrasound testing. The size of the projected defects shall be specified by the customer.

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3.

ACCEPTANCE 3.1. Pipes shall be packaged in bundles. One bundle shall include pipes of the same diameter, gauge, steel grade, and thermal treatment. Upon the customer’s request, pipes shall be from the same casting and shall be provided with a single quality certificate in accordance with GOST 10692. Additionally, the chemical composition in compliance with the quality certificate, as well as the data on thermal treatment, shall be provided. The maximum number of pipes in one bundle shall not exceed 300.

3.2. Each pipe shall be inspected for dimensions and surface quality, and shall be subjected to hydraulic pressure and ultrasound tests. 3.3. The following number of pipes shall be selected from each bundle for quality control purposes: •

2 pipes for tensile strength test.

•

1 pipe undergoes flattening or expansion test.

•

2 pipes for intercrystalline corrosion test.

.When the tests fail to produce satisfactory results for at least one property of the product, additional tests shall be required for a doubled number of pipes from the same bundle. The results of an additional test shall apply to the entire bundle. (Revised edition, Revision No. 5)

3.4. Excluded (Revision No. 5).

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4.

TEST METHODS 4.1. One sample from every selected pipe shall be required for each test type. 4.2. Pipe surfaces shall be subjected to visual examination. 4.3. The length of the pipes shall be measured using a tape in accordance with GOST 7502. (Revised edition, Revision No. 5)

4.4. The curvature of the pipes shall be measured using a ruler in compliance with GOST 8026 and by using a probe in compliance with standards. (Revised edition, Revision No. 4, 5)

4.5. The diameter and out-of-roundness of the pipes shall be measured using a smooth micrometer of MK type in compliance with GOST 6507 and snap gage in compliance with GOST18360 and GOST 18365. The gauge of the pipe shall be measured using a tubular micrometer of MT type in compliance with GOST 6507. (Revised edition, Revision No. 5)

4.6. The tensile strength test shall be conducted in compliance with GOST 10006 and GOST 19040 (under the temperature of 350 °C). Drift velocity of a movable gripper shall not exceed 10 mm per minute. When the yield point is reached, the testing speed of 40 mm per minute shall be permitted. Mechanical properties shall be permitted to be tested by the hardness method in compliance with applicable standards. In the event of disputes over the test results, the testing shall be conducted in compliance with GOST 10006 and GOST 19040.

4.7. Expansion tests shall be conducted for pipes with a maximum diameter of 150 mm and gauge not more than 10 mm in compliance with GOST 8694.

4.8. No tests for flattening, expansion, or tendency toward intercrystalline corrosion shall be required for pipes manufactured without thermal treatment. 4.9. Flattening tests shall be conducted for pipes of a maximum gauge of 10 mm in compliance with GOST 8695. Upon the customer’s request, flattening tests shall be conducted for pipes with a maximum gauge of 15% of the outside diameter. Where small defects on flattened samples result from the outside defects permitted without dressing, the tests shall be permitted to be repeated for a sample from the same pipe with prior surface dressing to 1/2 of the maximum deviation, but not more than 0.2 mm on the side where such defects have been detected. (Revised edition, Revision No. 1)

4.10. Hydraulic pressure testing shall be conducted in compliance with GOST 3845 provided that the load shall be applied for a period of not less than 10 seconds.

4.10.1. Nondestructive methods in compliance with GOST 17410 and regulations adopted after 1990-0101 shall be permitted to be used as a substitute for hydraulic pressure tests. (Amended, Revision No. 2)

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4.11. Ultrasound testing in compliance with GOST 17410 and standard specifications. 4.12. Intercrystalline corrosion tendency shall be tested using AM or AMY methods for all steel grades except grade 06XN28MDT and using the ВУ method for 06XN28MDT alloy in compliance with GOST 6032-89. In the event of disputes over the test results, AM testing of all steel grades except 06XN28MDT shall be conducted in compliance with GOST 6032. By agreement of the manufacturer and customer, testing of intercrystalline corrosion tendency of 12X18N10T and 08X22N6T steel grades may be conducted using the ПТ method in compliance with GOST 9.914-91. In the event of disputes over the test results, AM testing shall be conducted in compliance with GOST 6032-89. (Revised edition, Revision No. 2, 5)

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5.

IDENTIFICATION, PACKAGING, TRANSPORTATION, AND STORAGE 5.1. Identification, packaging, transportation, and storage in accordance with GOST 10692.

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DATA 1. Developed and introduced by Minchermet (USSR). Editori al Note.

The list of developers is omitted.

2. Approved and adopted by Gosstandard as of 1981-11-19, Resolution No. 5037. 3. Supersedes: GOST 9941-72 4. Referenced standards Indexes of standards

Referenced Section

Indexes of standards

Referenced Section

GOST 3845-75

2.9, 4.10

GOST 9941-81

1.8

GOST 5632-72

2.2

GOST 10006-80

4.6

GOST 6032-89

4.12

GOST 10692-80

3.1, 5.1

GOST 6507-90

4.5

GOST 17410-78

4.10. 1, 4.11

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

GOST 8695-75

4.9

5. Time limitation revoked by Resolution of Interstate Council for Standardization, Metrology, and Certification (IUS 2-93)

6. Reprint with 1983-08-01 -- Revision 1 (Resolution 11-83 of IUS) 1987-06-01 -- Revision 2 (Resolution 11-87 of IUS) 1988-06-01 – Revision 3 (Resolution 9-88 of IUS) 1988-08-01 -- Revision 4 (Resolution 12-88 of IUS) 2001-06-13 -- Revision 5 (Resolution 226- ст of IUS) 2002-01-01 -- Correction

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GOST 9941-81 cold and hot-deformed seamless pipes of corrosion resistant steel.pdf

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