GOST ISO 9329-4-2013

• gost-iso-9329-4-2013.pdf (1.21 MiB)
  ГОСТ ISO 9329-4-2013

GOST ISO 9329−4-2013 Steel seamless pipes for operation under pressure. Technical conditions. Part 4. Austenitic corrosion-resistant steels

GOST ISO 9329−4-2013

Group B62

INTERSTATE STANDARD

PIPES STEEL SEAMLESS FOR WORKING UNDER PRESSURE

Technical specifications

Part 4

Austenitic corrosion-resistant steels

Seamless tubes from austenitic high-alloy steels for pressure purposes. Specifications

ISS 23.040.10

Date of implementation 2015−01−01

Foreword

The goals and principles, the main order of works on interstate standardization are set by GOST 1.0−92 «Interstate Standardization System: Basic Provisions» and GOST 1.2−2009 «Interstate Standardization System: Interstate Standards, Rules and Recommendations for Interstate Standardization.» The rules for the development, adoption, application, update and cancel «

About the standard

1 PREPARED by the Technical Committee for Standardization of TC 357 «Steel and Cast Iron Pipes and Cylinders» and the Open Joint-Stock Company «Russian Research Institute of Pipe Industry» (OJSC «RosNITI»)

2 was introduced by the Technical Committee for Standardization of TC 357 «Steel and Cast Iron Pipes and Cylinders"

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 61-P of November 5, 2013)

For the adoption voted:

The country’s short name for the MK (ISO 3166) 004−97	Country code for MK (ISO 3166) 004−97	Abbreviated name of the national standardization body
Belarus	BY	State Standard of the Republic of Belarus
Kyrgyzstan	KG	Kyrgyzstandart
Russia	EN	Rosstandart
Armenia	AM	Ministry of Economy of the Republic of Armenia
Uzbekistan	UZ	Uzstandard
Tajikistan	TJ	Tajikstandart

4 This standard is identical to the international standard ISO 9329−4: 1997 * Seamless tubes from austenitic high-alloy steels for pressure purposes. Specifications (Seamless steel pipes for pressure purposes — Technical delivery conditions — Part 4: Austenitic corrosion-resistant steels).
Information on the compliance of interstate standards with reference international standards is given in the supplementary Appendix YES.

The degree of conformity is identical (IDT).

The standard is prepared on the basis of the application of GOST R ISO 9329−4-2010

5 By the order of the Federal Agency for Technical Regulation and Metrology dated August 01, 2014 No. 864-st, the interstate standard GOST ISO 9329−4-2013 was put into effect as the national standard of the Russian Federation from January 01, 2015.

6 INTRODUCED FOR THE FIRST TIME


Information on changes to this standard is published in the annual information index «National Standards», and the text of amendments and amendments is published in the monthly information index «National Standards». In case of revision (replacement) or cancellation of this standard, a corresponding notice will be published in the monthly information index «National Standards». The relevant information, notification and texts are also posted in the public information system — on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet

Introduction

In the text of this standard, with respect to ISO 9329−4: 1997, individual phrases have been changed, some terms and symbols have been replaced by their synonyms and equivalents in order to comply with the norms of the Russian language and in accordance with the terminology and notation adopted in the Interstate Standardization System.

Including, in accordance with the accepted terminology, the term «leak-tightness» is replaced by the term «continuity». In accordance with GOST 26877−91 the term «eccentricity» is replaced by the term «different thickness».

In accordance with the rules for the design of interstate standards in accordance with GOST 1.3−2008, the values of pressure in the test for continuity are specified in SI units.

In accordance with the adopted interstate system of designations, the following notations are replaced:

— ultimate tensile strength on ;

— yield point (with a disproportionate elongation of 0.2%) on ;

— yield point (with a total elongation of 1.0%) on ;

— the elongation after break on .

1 area of use

This standard applies to seamless round cross-section pipes made of austenitic high-alloy steels.

Pipes are designed to work under pressure in conditions of exposure to corrosive media at room, low or elevated temperatures, for example in high-pressure installations, chemical plants, steam generators and pipeline systems.

Pipes manufactured in accordance with this standard can meet various requirements for properties at room temperature, toughness at low temperatures and yield strength at elevated temperatures, depending on the purpose and operating conditions.

Users of this standard must also take into account the requirements of ISO 1129, ISO 2037, ISO 6759, ISO 7598. Pipes for boilers and pressure vessels must comply with ISO / R 831 and ISO 5730.

Note

1 The term «tube» is synonymous with «pipe»; In the national pipe industry, the term «pipe» is used in both cases.

2 This standard can be applied to pipes of another (non-circular) cross-section. In this case, the requirements for the chemical composition and mechanical properties of the pipes of this standard should be applied. The remaining requirements must be agreed between the manufacturer and the customer.


This standard does not apply to:

a) casing, tubing, drill pipes and pipes for oil and gas industry pipelines;

(b) pipes for the transport of gas, water and sewage.

General technical requirements for pipes are given in ISO 404.

2 Normative references

The following reference documents * are required for the application of this standard. For dated references, only the edition cited applies.
_______________
* Refer to the table of compliance of national standards with international standards. — Note of the database manufacturer.

ISO 148: 1989 Steel — Charpy impact test (-notch) (Steel: Charpy impact test (samples with -shaped notch)
________________
ISO 148−1: 2009 applies.


ISO 377−1: 1989 Selection and preparation of samples and test pieces of wrought steels — Part 1: Samples and test pieces for mechanical test (Sampling and preparation of samples and samples for testing from deformable steels — Part 1: Samples for mechanical testing)
________________
ISO 377: 1997 applies.


ISO 404: 1992 Steel and steel products — General technical delivery requirements (Steel and steel billets, General technical delivery conditions)

ISO 683−13: 1986 Heat treatable steels — Part 13: Wrought stainless steels (Heat-treated steels, alloyed and automatic steels, Part 13: Deformable corrosion-resistant steels)
________________
Applicable only for the application of this standard.


ISO 6892−2: 2011 Metallic materials — Tensile testing at elevated temperature (Metallic materials — Tensile strength at elevated temperature)
________________
Acts instead of ISO 783: 1989.


ISO / R 831: 1968 Rules for construction of stationary boilers (Stationary boilers — Manufacturing instructions)
________________
Applicable only for the application of this standard.


ISO 1127: 1992 Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length (Stainless steel pipes — Dimensions, tolerances and nominal weight per unit length)

ISO 1129: 1980 Steel tubes for boilers, superheaters and heat exchangers — Dimensions, tolerances and conventional masses per unit length (Steel pipes for boilers, superheaters and heat exchangers — Dimensions, tolerances and conditional masses per unit length)

ISO 2037: 1992 Stainless steel tubes for the food industry (Stainless steel pipes for the food industry)

ISO 2566−2: 1984 Steel — Conversion of elongation values — Part 2: Austenitic steels (Steel Tables for the translation of the values of the relative elongation — Part 2: Austenitic steels)

ISO 3205: 1976 Preferred test temperatures (Temperatures preferred for testing)

ISO 3651−1: 1976 Determination of resistance to intergranular corrosion of stainless steels — Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in nitric acid (Huey test) (Determination of resistance to intergranular corrosion. Part 1. Austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in nitric acid by measuring the loss of mass (Hugh method))
________________
ISO 3651−1: 1998 applies.


ISO 3651−2: 1976 Determination of resistance to intergranular corrosion — Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing sulfuric acid (Stainless steels — Determination of resistance to intergranular corrosion — Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in a medium containing sulfuric acid (Strauss method))
________________
ISO 3651−2: 1998 applies.


ISO 4200: 1991 Plain end steel tubes, welded and seamless — General tables of dimensions and masses per unit length (Steel tubes with smooth ends, welded and seamless — General tables of sizes and masses per unit length)

ISO / TR 4949: 1989 Steel names based on letter symbols (Steel names based on alphabetic characters)
________________
ISO / TS 4949: 2003 applies.


ISO 5252: 1991 Steel tubes -Tolerance systems (Steel pipes — Tolerance systems)

ISO 5730: 1992 Stationary shell boilers of welded construction (other than water-tube boilers (Stationary boilers with smoke tubes of welded construction (excluding water tube boilers))
________________
Applicable only for the application of this standard.


ISO 6759: 1980 Seamless steel tubes for heat exchangers (Stainless steel seamless pipes for heat exchangers)

ISO 6761: 1981 Steel tubes — Welding pipe ends and fittings for welding —

ISO 6892−1: 1984 Metallic materials — Tensile testing (Metallic materials — Tensile test at ambient temperature)
________________
Operates ISO 6892−1: 2009


ISO 7438: 1985 Metallic materials — Bend test (Metallic materials — Bending test)
________________
ISO 7438: 2005 applies


ISO 7598: 1988 Stainless steel tubes suitable for screwing in accordance with ISO 7−1 (Corrosion resistant steel pipes for threading according to ISO 7−1)

ISO 8492: 1986 Metallic materials — Tube — Flattening test (Metallic materials — Pipes — Flattening test)
________________
ISO 8492: 1998 applies.


ISO 8493: 1986 Metallic materials — Tube — Drift expanding test (Metallic materials — Pipes — Testing for distribution)
________________
ISO 8493: 1998 applies.


ISO 8495: 1986 Metallic materials — Tube — Ring expanding test (Metallic materials — Pipes — Ring flaring test)
________________
There is ISO 8495: 1998.


ISO 8496: 1986 Metallic materials — Tube — Ring tensile test (Metallic materials — Pipes — Tensile testing of rings)
________________
ISO 8496: 1998 applies.


ISO 10893−1: 2011 Non-destructive testing of steel tubes — Part 1: Automated electromagnetic testing of seamless steel pipes (Part 1: Automatic immersion testing of steel seamless and welded pipes) (except for pipes obtained by submerged arc welding) for verification of tightness)
________________
Acts instead of ISO 9302: 1994.


ISO 10893−10: 2011 Seamless and welded steel pipes for pressure purposes — Part 10: Full peripheral ultrasonic testing (the pipes are seamless and welded welded (except for pipes obtained by submerged arc welding). Ultrasonic inspection of the entire peripheral surface to detect longitudinal imperfections)
________________
Acts instead of ISO 9303: 1989 and ISO 9305: 1989.


ISO / TR 9769: 1991 Steel and iron — Review of available methods of analysis (Review of existing methods of analysis)

ISO 10332: 1994 Seamless and welded (except submerged arc welded) tubes for pressure purposes — Ultrasonic testing for hydraulic leak-tightness (Seamless and welded steel pipes (except for submerged arc welding) — Ultrasonic testing for leak testing)
________________
ISO 10332: 2010 applies.


ISO 10474: 1991 Steel and steel products — Inspection documents (Steel and steel products — Control documents)

ISO 10893−8: 2011 Seamless and welded steel tubes for pressure purposes — Part 8: Ultrasonic testing of tube ends for the detection of laminar imperfections (Pipes steel seamless and welded pressure head — Part 8: Ultrasonic inspection of pipe ends for detection of layered imperfections)
________________
Acts instead of ISO 11496: 1993.


ISO 14284: 1996, Steel and iron — Sampling and preparation of samples for the determination of chemical composition (Steel and cast iron — Selection and preparation of samples for the determination of the chemical composition)

NOTE — When using this standard it is advisable to check the operation of reference standards in the public information system — on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or on the annual information index «National Standards», which was published as of January 1 of this year, and on the issues of the monthly information index «National Standards» for the current year. If the reference standard is replaced (modified), then when using this standard should be guided by a replacement (modified) standard. If the reference standard is canceled without replacement, then the provision referring to it is applied in the part not affecting this reference.

3 Notations

3.1 Designations of pipe sizes

 — outside diameter;

 — inner diameter;

wall thickness.

3.2 Designations for pipe size deviations

The designations for the limiting deviations in pipe dimensions correspond to the notations adopted in ISO 5252.

3.3. Designations used in the description of tests

3.3.1. The designations used to describe the tensile test are in accordance with ISO 6892.

3.3.2. Designations used to describe the flattening test:

 — the distance between the flattening surfaces;

coefficient of deformation.

3.3.3. Designations used to describe the hydrostatic pressure test:

 — test pressure;

 — allowable stress in the pipe wall during the test.

4 Information provided by the customer

4.1 Mandatory information

In order for tubes, the customer must specify:

— product name — pipe;

— designation of the standard for dimensions;

— Dimensions (outer diameter and wall thickness or, if agreed between the manufacturer and the customer, inner diameter and wall thickness) in millimeters (7.1);

— the length (7.2);

— limit deviations of length for pipes of dimensional length exceeding 12 m (7.3.2);

— designation of this standard;

— steel grade (table 1);

— the test category (9.2);

— type of acceptance inspection document (9.1 and section 12).

4.2 Additional Information

In the order for pipes supplied in accordance with the requirements of this standard, the customer can specify the following additional requirements, having previously agreed with the manufacturer:

— method of steel smelting (5.1);

— heat treatment during the hot deformation of pipes [5.3.1, enumeration b)];

— special limit deviations of the outer diameter and wall thickness (other than those specified in Tables 5 and 6);

— testing of mechanical properties on specimens thermally treated according to a special regime (6.2.1);

— chamfering at the ends of the pipes (8.2);

— special requirements for the straightness of the pipes (8.1.7);

— type of surface (8.1.1 and table 7);

— control of the chemical composition of the pipes (9.3);

— determination of yield point at elevated temperature, yield stress, sampling rate and test temperature (9.4.2);

— hydrostatic test of continuity (9.5);

— impact test at room temperature (9.9.5.1);

— impact bending test at reduced temperature (9.4.3 and 9.9.5.2);

— special labeling requirements (10.3);

— Nondestructive testing to detect transverse defects (9.9.8.2, for test category II);

— Nondestructive testing of pipe ends to identify bundles (9.9.8.3);

— the test for resistance to intergranular corrosion (6.4);

— drawing of the bar code (10.1);

— application of a special protective coating (section 11).

4.3 Example of pipe designation in an order

An example of the designation of seamless pipes with dimensions corresponding to ISO 1127 — an external diameter of 168.3 mm, a wall thickness of 4 mm, a measuring length of 6 m, of steel grade X 6 CrNiNb 18 11 and a HFS2 surface subjected to category I acceptance tests, with the attached document on acceptance inspection type 3.1.B to ISO 10474:

Pipe ISO 1127−168.3 4−6- GOST R ISO 9329−4 -X 6 CrNiNb 18 11-HFS2 — I — ISO 10474 3.1.B

5 Production technology

5.1 Method of steel smelting

Upon request, the customer should be provided with information on the method of steelmaking.

NOTE — Steels may be cast into ingots, blanks, or produced in a different way, resulting in similar results. In the continuous casting of steels of different grades, a transition metal segment must be identified and completely removed. The removal of the transition section must be carried out in accordance with the established procedure, which ensures the separation of steel grades.

5.2 Method of producing pipes

Pipes are manufactured by seamless hot or cold deformation methods or a combination of these methods.

The terms «hot-deformed» and «cold-deformed» are applied to the state of the pipes prior to heat treatment carried out in accordance with 5.3.

Unless otherwise agreed, the manufacturing method of the pipes is chosen by the manufacturer.

5.3 Heat treatment and delivery conditions

5.3.1 Pipes are supplied thermally treated along the entire length (Table 3) in one of the following states:

a) in the state after solution heat treatment;

b) as agreed between the manufacturer and the customer in the after-heat treatment condition during the hot deformation process, if the pipes were deformed in the solution solution temperature range indicated in Table 3 and accelerated cooling (4.2).

5.3.1.1 The type and condition of the pipe surface is shown in Table 7. The pipe surface type is selected by the customer (4.2 and Table 7).

5.3.2 Solution heat treatment consists in uniform heating of the pipes to a temperature within the range indicated in Table 3 and subsequent accelerated cooling.

NOTE — In the case of subsequent hot treatment of pipes, for example hot bending, additional processing, for example stabilizing annealing, can be performed to prevent a significant change in the properties of the steel.

6 Requirements for pipe material

6.1 Chemical composition

6.1.1 Analysis of melting

The chemical composition of the steel, determined by the results of the analysis of melting, should correspond to that indicated in Table 1.


Table 1 — Chemical composition of steels for analysis of melting

steel grade	Mass fraction of elements,%
FROM	Si, not more than	Mn, not more than	P, not more than	S, not more than	Cr	Mo	Ni	Other
X 2 CrNi 18 10	Not more than 0,030	1.00	2.00	0.040	0.030	17.00−19.00	-	9.00−12.00	-
X 5 CrNi 18 9	Not more than 0,07	1.00	2.00	0.040	0.030	17.00−19.00	-	8.00−11.00	-
X 7 CrNi 18 9	0.04−0.10	1.00	2.00	0.040	0.030	17.00−19.00	-	8.00−11.00	-
X 6 CrNiNb 18 11	Not more than 0,08	1.00	2.00	0.040	0.030	17.00−19.00	-	9.00−13.00	Nb: 10 % С — 1.00
X 7 CrNiNb 18 11	0.04−0.10	1.00	2.00	0.040	0.030	17.00−19.00	-	9.00−13.00	Nb: 10 % С — 1,20
X 6 CrNiTi 18 10	Not more than 0,08	1.00	2.00	0.040	0.030	17.00−19.00	-	9.00−12.00	Ti: 5 % С — 0.80
X 7 CrNiTi 18 10	0.04−0.10	1.00	2.00	0.040	0.030	17.00−19.00	-	9.00−12.00	Ti: 5 % С — 0.80
X 2 CrNiMo 17 12	Not more than 0,030	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	11.00−14.00	-
X 2 CrNiMo 17 13	Not more than 0,030	1.00	2.00	0.040	0.030	16.50−18.50	2.50−3.00	11.50−14.50	-
X 5 CrNiMo 17 12	Not more than 0,07	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	10.50−13.50	-
X 7 CrNiMo 17 12	0.04−0.10	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	10.50−13.50	-
X 7 CrNiMo B 17 12	0.04−0.10	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	10.50−13.50	B: 0.001−0.005
X 6 CrNiMoTi 17 12	Not more than 0,08	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	11.00−14.00	Ti: 5 % С — 0.80
X 6 CrNiMoNb 17 12	Not more than 0,08	1.00	2.00	0.040	0.030	16.50−18.50	2.00−2.50	11.00−14.00	Nb: 10 % С — 1.00
X 5 CrNiMo 17 13	Not more than 0,07	1.00	2.00	0.040	0.030	16.50−18.50	2.50−3.00	11.00−14.00	-
X 2 CrNiN 18 10	Not more than 0,030	1.00	2.00	0.040	0.030	17.00−19.00	-	8.50−11.50	N: 0.12−0.22
X 2 CrNiMoN 17 13	Not more than 0,030	1.00	2.00	0.040	0.030	16.50−18.50	2.50−3.00	11.50−14.50	N: 0.12−0.22
Designations are given in accordance with the rules laid down in ISO / TR 4949. Elements not specified in this table shall not be added to the steel without the consent of the customer, if they are not technologically necessary. In special cases, if the customer believes that the mass fractions of the elements not included in this table are important for ensuring the mechanical and technological properties of the steel under the intended conditions of its use, the permissible mass fractions of such elements in the analysis of melting should be specified in the order. Steel analysis of these elements is carried out by agreement between the manufacturer and the customer. It is permissible to alloy steel with tantalum instead of niobium.

6.1.2 Product Analysis

At the customer’s request, the chemical composition of the steel, determined by the analysis of the metal of the pipes (9.3), shall be as specified in Table 1, taking into account the limiting deviations in the analysis of the melting specified in Table 2.


Table 2 — Limit deviations of the chemical composition of steel from the table 1

In percentages

Chemical element	The mass fraction of the elements established for the analysis of melting	Limit Deviation
C	Up to 0.030 inclusive.	+0.005
0.030 to 0.10 inclusive.	± 0.01
Si	Not more than 1,00	+0.05
Mn	Not more than 2,00	+0.05
P	Not more than 0.040	+0.005
S	Not more than 0,030	+0.003
Cr	Not more than 19.0	± 0.20
Mo	Not more than 3,00	± 0.08
N	Not more than 0.22	± 0.02
Nb	Not more than 1,20	± 0.05
Ni	Not more than 14.50	+0.15
Ti	Not more than 0,80	± 0.15
B	Not more than 0,005	± 0.0001

Within one fusion for one element, a deflection is allowed only on the upper or only the lower of the specified limits. Simultaneous deviation from the upper and lower limits is not allowed.

If only a positive deviation is established, a minus deviation is not allowed.

6.2 Mechanical and technological properties

6.2.1 Properties of pipes at room temperature

The mechanical and technological properties of the pipes, determined at room temperature (23 ± 5) ° C to ISO 3205, shall be as specified in Table 3.


Table 3 — Mechanical properties at room temperature of austenitic steels in the state after solution heat treatment, heat treatment conditions and corrosion resistance (for a wall thickness of 50 mm or less)

steel grade	Tensile Testing					Impact bending test
Yield strength, N / mm , not less than		The limit of the of the , N / mm	Relative elongation ,%, not less than		Operation of a beat , J, not less than
		Pro- dol- the zec	The pope Re- the zec	Pro- dol- the zec	The the zec
X 2 CrNi 8 10	180	215	480−680	40	35	85	55
X 5 CrNi 18 9	195	230	500−700	40	35	85	55
X 7 CrNi 18 9	195	230	490−690	40	35	85	55
X 6 CrNiNb 18 11	205	240	510−740	40	35	85	55
X 7 CrNiNb 18 11	205	240	510−740	40	35	85	55
X 6 CrNiTi 18 10	175	210	490−690	40	35	85	55
X 7 CrNiTi 18 10	175	210	490−690	40	35	85	55
X 2 CrNiMo 17 12	190	225	490−690	40	35	85	55
X 2 CrNiMo 17 13	190	225	490−690	40	35	85	55
X 5 CrNiMo 17 12	205	240	510−710	40	35	85	55
X 7 CrNiMo 17 12	205	240	510−710	40	35	85	55
X 7 CrNiMoB 17 12	205	240	510−710	40	35	85	55
X 6 CrNiMoTi 17 12	210	245	510−710	40	35	85	55
X 6 CrNiMoNb 17 12	215	250	510−740	40	35	85	55
X 5 CrNiMo 17 13	205	240	510−710	40	35	85	55
X 2 CrNiN 18 10	270	305	580−780	40	35	85	55
X 2 CrNiMoN 17 13	280	315	580−80	40	35	85	55

End of Table 3

steel grade	Testing on sleep- The the	Test for distribution			Recommended heat treatment conditions			Stand- bone to inter- Chris- tal- cast corrosion the
Coefficient the de- for- empires	Increase for ,%			The know-how the	Solution treatment temperature , FROM	Oh- lazh- de- the
Up to 0.6 inclusive.	St 0,6 to 0,8 inclusive.	St. 0.8
X 2 CrNi 8 10	0.09	9	15	17th	Q	1000−1100	w, and	g
X 5 CrNi 18 9	0.09	9	15	17th	Q	1000−1100	w, and	g
X 7 CrNi 18 9	0.09	9	15	17th	Q	1050−1120	w, and	N / A
X 6 CrNiNb 18 11	0.09	9	15	17th	Q	1020−1120	w, and	g
X 7 CrNiNb 18 11	0.09	9	15	17th	Q	1050−1120	w, and	N / A
X 6 CrNiTi 18 10	0.09	9	15	17th	Q	1020−1120	w, and	g
X 7 CrNiTi 18 10	0.09	9	15	17th	Q	1050−1120	w, and	N / A
X 2 CrNiMo 17 12	0.09	9	15	17th	Q	1020−1120	w, and	g
X 2 CrNiMo 17 13	0.09	9	15	17th	Q	1020−1120	w, and	g
X 5 CrNiMo 17 12	0.09	9	15	17th	Q	1020−1120	w, and	g
X 7 CrNiMo 17 12	0.09	9	15	17th	Q	1050−1120	w, and	N / A
X 7 CrNiMoB 17 12	0.09	9	15	17th	Q	1050−1120	w, and	N / A
X 6 CrNiMoTi 17 12	0.09	9	15	17th	Q	1020−1120	w, and	g
X 6 CrNiMoNb 17 12	0.09	9	15	17th	Q	1020−1120	w, and	g
X 5 CrNiMo 17 13	0.09	9	15	17th	Q	1020−1120	w, and	g
X 2 CrNiN 18 10	0.09	9	15	17th	Q	1000−1100	w, and	g
X 2 CrNiMoN 17 13	0.09	9	15	17th	Q	1020−1120	w, and	g
With a wall thickness of more than 50 mm, the values must be agreed between the manufacturer and the customer. Longitudinal sample — the axis of the specimen is parallel to the axis of the pipe; transverse pattern — the axis of the sample is perpendicular to the axis of the tube. Applicable if the transverse sample can not be manufactured (9.4.1.5.5). Q is a solution heat treatment. Recommended values, unless testing of control samples is required. When heat treatment in a continuous furnace, the temperature of the furnace is recommended to be kept close to the upper limit of the set interval. It is allowed not to conduct heat treatment on a solid solution, if during hot deformation and subsequent cooling all requirements to mechanical properties and corrosion resistance of pipes will correspond to the established ones. w is water; a — air, accelerated cooling. When carrying out the test in accordance with ISO 3651−2: g — to the temperature specified in column «Maximum temperature, ° C» of table 4. Intergranular corrosion resistance test is not applicable (N / A) for steels intended for operation at elevated temperatures. If heat treatment of pipes is expected after delivery, it is recommended to apply temperatures close to the lower boundary of the interval. If during the hot deformation the temperature does not fall below the set lower limit, it is recommended to repeat the heat treatment at the following temperatures: 980 ° C — for steels that do not contain molybdenum; 1000 ° C — for steels with a mass fraction of molybdenum equal to or less than 3%; 1020 ° C — for steels with a mass fraction of molybdenum more than 3%. Only for pipes with a wall thickness of not more than 6 mm.

NOTE — If, after the delivery of pipes, heat treatment of pipes different from that specified in this standard or additional heat treatment (which may affect the mechanical properties of the pipes) is expected, additional mechanical tests of the pipes on thermally processed samples should be carried out, different from those indicated in Table 3. The modes of heat treatment of the samples and the mechanical properties obtained in these tests should be coordinated between the manufacturer and the customer.

6.2.2 Properties of pipes at elevated temperature

6.2.2.1. Yield strength and metal pipes at an elevated temperature should be not less than that indicated in Table 4.


Table 4 — yield point at elevated temperatures for pipes in the state after solution heat treatment and the temperature limit to which the pipes are resistant to intergranular corrosion (for pipes with a wall thickness of 50 mm or less)

steel grade	, N / mm , at temperature, ° С, not less than										, N / mm , at temperature, ° С, not less than										Pre- del- th tem- pen- tour , FROM
150	200	250	300	350	400	450	500	550	600	150	200	250	300	350	400	450	500	550	600
X 2 CrNi 18 10	116	104	96	88	84	81	78	76	74	72	150	137	128	122	116	110	108	106	102	100	350
X 5 CrNi 18 9	126	114	106	98	93	89	86	84	81	79	160	147	139	132	125	120	117	115	112	109	300
X 7 CrNi 18 9	126	114	106	98	93	89	86	84	81	79	160	147	139	132	125	120	117	115	112	109	-
X 6 CrNiNb 18 11	162	153	147	139	133	129	126	124	122	121	192	182	172	166	162	159	157	155	153	151	400
X 7 CrNiNb 18 11	162	153	147	139	133	129	126	124	122	121	192	182	172	166	162	159	157	155	153	151	-
X 6 CrNiTi 18 10	149	144	139	135	129	124	119	116	111	108	179	172	164	158	152	148	143	140	138	135	400
X 7 CrNiTi 18 10	123	117	114	110	105	100	95	93	90	88	155	147	141	133	129	126	121	118	116	115	-
X 2 CrNiMo 17 12	130	120	109	101	96	90	87	84	81	79	161	149	139	133	127	123	119	115	112	110	400
X 2 CrNiMo 17 13	130	120	109	101	96	90	87	84	81	79	161	149	139	133	127	123	119	115	112	110	400
X 5 CrNiMo 17 12	144	132	121	113	107	101	98	95	92	90	172	159	150	143	137	133	129	125	121	119	300
X 7 CrNiMo 17 12	144	132	121	113	107	101	98	95	92	90	172	159	150	143	137	133	129	125	121	119	-
X 7 CrNiMoB 17 12	144	132	121	113	107	101	98	95	92	90	172	159	150	143	137	133	129	125	121	119	-
X 6 CrNiMoTi 17 12	(148)	(137)	(126)	(117)	(111)	(105)	(102)	(99)	(95)	(93)	(183)	(169)	(159)	(152)	(147)	(142)	(138)	(133)	(129)	(127)	400
X 6 CrNiMoNb 17 12	(153)	(141)	(130)	(121)	(115)	(109)	(106)	(102)	(99)	(97)	(186)	(172)	(163)	(155)	(150)	(145)	(141)	(136)	(132)	(130)	400
X 5 CrNiMo 17 13	144	132	121	113	107	101	98	95	92	90	172	159	150	143	137	133	129	125	121	119	300
X 2 CrNiN 18 10	169	155	143	135	129	123	119	115	113	110	201	182	172	163	156	149	144	140	136	131	400
X 2 CrNiMoN 17 13	178	164	154	146	140	136	132	129	126	124	208	192	180	172	166	161	157	152	149	144	400
With a wall thickness of more than 50 mm, the values must be agreed between the manufacturer and the customer and specified in the order for the supply of pipes. The values indicated in parentheses are determined from the dependencies obtained by the regression analysis of the hardening curves of similar steels. Up to these temperatures, the material is resistant to intergranular corrosion for 100,000 hours, when tested in accordance with ISO 3651−1, ISO 3651−2. Only for pipes with a wall thickness of not more than 6 mm.

NOTE — Yield strengths and shall be determined at the request of the customer, in accordance with 9.4.2.

6.2.2.2 The long-term strength of the pipe metal for reference is indicated in Table A.1 (Annex A).

6.2.3 Properties of pipes at low temperature

Minimum impact values and test temperature must be agreed and specified in the order.

The impact work at reduced test temperatures for reference is indicated in Table B.1 (Annex B).

NOTE — Impact work is determined at the customer’s request in accordance with 9.4.2 for the steels of the grades listed in Table B.1 (Annex B).

6.3 Weldability

Steels for the production of pipes supplied under this standard are considered suitable for welding. However, the customer must take into account that the behavior of steel during and after welding depends not only on the properties of the steel, but also largely on the conditions and technology of welding, as well as on the intended use of products from the supplied pipes.

6.4 Corrosion resistance

6.4.1 This standard specifies requirements for the resistance of metal pipes to intergranular corrosion and does not consider other types of corrosion or exposure to corrosive media.

6.4.2 Special tests of corrosion resistance must be agreed between the manufacturer and the customer in the order. In this case, the test conditions and the evaluation of the results must be agreed.

Requirements for the resistance of metal pipes to intergranular corrosion should be consistent, for example, based on ISO 3651−1 or ISO 3651−2.

6.4.3 When testing for intergranular corrosion resistance according to ISO 3651−2 (9.4.4 and 9.9.6), the values given in Table 3 should be applied.

The limiting temperatures to which the pipes are resistant to intergranular corrosion are listed in Table 4 for reference.

7 Dimensions, Weights and Limit Deviations

7.1 Diameter, wall thickness and weight of pipes

The outer diameter, wall thickness and mass of 1 m of pipes supplied in accordance with this standard shall comply with ISO 1127 and ISO 4200 .
________________
In the national industry of the Russian Federation, the standardized values of the outer diameter and wall thickness of pipes are given in GOST 9940−81 for hot-formed pipes, in GOST 9941−81 — for cold-deformed pipes.


For pipes of special purpose, the outer diameter, wall thickness and mass of 1 m of pipes shall comply with ISO 1129, ISO 2037, ISO 6759.

As agreed between the manufacturer and the customer, the pipes can be manufactured according to the internal diameter and wall thickness. In this case, the dimensions and their limit deviations must be agreed and specified in the order.

7.2 Length

7.2.1 Pipes are produced in a non-dimensional (7.2.2) or dimensional (7.2.3) length in accordance with the requirements of the order.

7.2.2 Unimensional length pipes are manufactured in lengths ranging from 2 to 7 m.

7.2.3. Measured length pipes shall be manufactured with the maximum length deviation specified in 7.3.2.

7.3 Limit Deviations

7.3.1 Limit deviations of the outer diameter and wall thickness

The outside diameter and wall thickness of the pipes must be within the tolerances specified in Tables 5 and 6 (9.6). Limit deviations of the outer diameter and wall thickness of the pipe are selected depending on the technology of production of pipes, steel grade and the method of subsequent processing.


Table 5 — Limit deviations of the outer diameter and wall thickness of cold-deformed pipes

Outside diameter			Wall thickness
, mm	Class of limiting deviations	Limit Deviation	Class of limiting deviations	Limit Deviation
Not more than 219.1	D2	± 1,0%, but not less than ± 0,5 mm	T3	± 10%, but not less than ± 0.2 mm

Table 6 — Limit deviations of the outer diameter and wall thickness of hot-deformed pipes

Outside diameter			Wall thickness
, mm	Class of limiting deviations	Limit Deviation	Class of limiting deviations	Limit Deviation
thirty 219.1	D1	± 1.5%, but not less than ± 0.75 mm	T1	± 15%, but not less than ± 0.6 mm
D2	At customer’s request ± 1.0%, but not less than ± 0.5 mm	T2	At customer’s request ± 12,5%, but not less than ± 0,4 mm
219.1 <<img alt="GOST ISO 9329-4-2013 Steel seamless pipes for operation under pressure. Technical conditions. Part 4. Austenitic corrosion-resistant steels" src="http://data:image/jpeg;base64,R0lGODdhHQARAIABAAAAAP///ywAAAAAHQARAAACMoyPqcvtD6MBtEoHUIZ79Yl9iRiQJfWQIhqpo6mYMny4jeXFra7RaYWLAYGXovGIRBQAADs="/>610	D1	± 1.5%, but not less than ± 0.75 mm	+ 22.5% -15%
T1	± 15%, but not less than ± 0.6 mm
T2	± 12.5%, but not less than ± 0.4 mm
For wall thickness pipes and 4 mm only class T1 is applicable. At the customer’s request, the pipe ends must be calibrated. The permissible deviations of the outer diameter at the ends of pipes 100 mm long should not exceed ± 0,6%. For pipes with . For pipes with . For pipes with .

To the pipes supplied under this standard, there are no special limit deviations provided for in ISO 2037 and ISO 6759.

In pipe surface repair areas, it is allowed to reduce the outer diameter at a length of not more than 1 m below the permissible minimum value, provided that the wall thickness of the pipes does not exceed the allowable minimum value.

Ovality and heterogeneity of pipes should not lead to the diameter and thickness of the pipe wall for the appropriate permissible values.

7.3.2 Limit length deviations, mm, for pipes of dimensional length:

— up to 6 m inclusive. — ;

— St. 6 to 12 m inclusive. — ;

— St. 12 m inclusive — Limit deviations are established by agreement between the manufacturer and the customer.

8 Delivery status

8.1 Surface condition (quality) and straightness of pipes

8.1.1 The surface condition of the pipes is determined by the manufacturing method chosen by the manufacturer. At the request of the customer, the pipes are manufactured with a surface, the type of which is specified in the order (Table 7).

NOTE — Special requirements for the surface condition of the pipes must be agreed between the manufacturer and the customer and are specified in the order.


Table 7 — Pipe surface type and condition

Type of surface	Method of obtaining	Surface condition	Notes
HFS1	Hot Deformation, Heat Treatment , mechanical descaling	Purified	For mechanical descaling, it can be used, for example shot blasting. Unless otherwise agreed, the cleaning method is chosen by the manufacturer
HFS2	Hot Deformation, Heat Treatment , etching
HFS3	Hot Deformation, Heat Treatment , mechanical restoration	Mechanically machined	-
HFS4	Hot Deformation, Heat Treatment , without descaling	With rolling scale	For pipes that do not require descaling, or are subjected to subsequent machining
CFS1	Cold deformation, heat treatment, without descaling	With rolling scale	For pipes that do not require descaling, or are subjected to subsequent machining
CFS2	Cold deformation, heat treatment, mechanical or chemical descaling	With traces of scale	-
CFS3	Cold deformation, heat treatment, mechanical or chemical descaling, etching	Light after etching, smoother than HFS2	-
CFS4	Cold deformation, annealing in a protective atmosphere	Light after annealing in a protective atmosphere, smoother than CFS3	-
CFS5	Cold drawing, annealing in a protective atmosphere	Light after annealing in a protective atmosphere, smoother than CFS3 or CFS4	Recommended for subsequent grinding and polishing
CFS6	Grinding	Grinded, the method of grinding and surface roughness should be coordinated	Surfaces in the CFS3, CFS4 or CFS5 state are usually preparatory
CFS7	Polishing	Polished, polishing and surface roughness must be matched	Surfaces in the CFS3, CFS4 or CFS5 state are usually preparatory
In the order, combinations of different types of surfaces can be coordinated and indicated. In accordance with table 3 of ISO 683−13. In accordance with 5.3.1. If it is necessary to supply pipes with a polished or polished surface, the workpiece must be indicated in the order: internal and / or external.

8.1.2 The surface of the pipes must be cleaned and free from defects detected by visual inspection (9.7).

8.1.3 The surface condition of the pipes should ensure the identification of imperfections that must be removed.

8.1.4 Seals, hair, scoring, sunsets, undercuts, flaws and nicks must be removed mechanically or by grinding, and the thickness of the pipe wall at the places of stripping should not exceed the allowable minimum values. Surface repair by welding is not allowed.

8.1.5 Imperfections of the surface that lead to the wall thickness beyond the permissible minimum values shall be considered defects, and the surface — not meeting the requirements of this standard.

8.1.6 The surface of the pipe section after removing imperfections should smoothly move to the contiguous surface of the pipe.

8.1.7 Pipes shall be straight.

The deviation from straightness of any section of the pipe with a length of 1 m should not exceed 3 mm.

The deviation from straightness along the entire length of pipes with an outer diameter of more than 50 mm should not exceed 0.2% of the length of the pipe.

As agreed between the manufacturer and the customer, pipes with special requirements for straightness are allowed.

8.2 Finishing of pipe ends

The ends of the pipes must be cut at a right angle and stripped of burrs. As agreed by the manufacturer and the customer, a chamfer shall be made at the ends of the pipes in accordance with ISO 6761.

9 Inspection and testing

9.1 Documentation of acceptance inspection

9.1.1 Types of inspection and testing, types of acceptance inspection documents to be drawn up according to the results of inspection in accordance with ISO 404 and ISO 10474, are given in Table 8. Types of inspection and testing, the types of acceptance inspection documents must be specified by the customer when placing an order 4.1).


Table 8 — Control and test methods, types of acceptance inspection documents

Document type menta	Document type	Control method	Content of the document	Delivery conditions	The document is signed by
2.2	Test report	Normal	With indication of the results of monitoring and testing	In accordance with the requirements of the order and, if necessary, in accordance with the requirements of legislation or technical regulations	Authorized representative of the manufacturer who can be engaged in the production process
2.3	Special test report	Receiving- commission tests	With indication of the results of monitoring and testing	In accordance with the requirements of the order and, if necessary, in accordance with the requirements of legislation or technical regulations	Authorized representative of the manufacturer who can be engaged in the production process
3.1.A	Certificate of technical control «3.1. A"	In accordance with the requirements of the order and the requirements of legislation or technical regulations	Inspector provided by law
3.1.V.	Certificate of Technical Inspection «3.1.	In accordance with the requirements of the order and, if necessary, in accordance with the requirements of legislation or technical regulations	Authorized representative of the manufacturer, not associated with the production process
3.1.C	Certificate of technical control «3.1.С"	In accordance with the requirements of the order	Authorized representative of the customer
3.2.	Act of Acceptance	In accordance with the requirements of the order	Authorized representative of the manufacturer, not associated with the production process, and an authorized representative of the customer
In accordance with ISO 10474, under normal control, monitoring and testing carried out by the manufacturer in accordance with the manufacturing process should be understood to ensure that the product meets the requirements of the order within the established process.

9.1.2. If the order specifies the provision of a certificate of technical inspection (ISO 10474−3.1.A, 3.1.B or 3.1.C) or an acceptance certificate (ISO 10474, 3.2), then it must be done (Table 8 and 9.2) -delivery tests of pipes according to 9.3−9.8, the results of which must be indicated respectively in the certificate or acceptance certificate.

In addition, in the certificate or certificate of acceptance must be indicated:

a) results of the smelting analysis;

b) results of monitoring and testing with respect to the fulfillment of additional requirements (4.2);

c) identification data relating to the order and test results of the batch of pipes;

d) information on the heat treatment performed (5.3).

9.2 Test categories

The pipes are subjected to the controls and tests specified in Table 9.


Table 9 — Type and category of tests

Type of test		Test Category
I	II
Required	Visual inspection (9.7)	+	+
Dimensional control (9.6)	+	+
Hydrostatic testing or non-destructive testing of continuity (9.9.7)	+	+
The tensile test at room temperature (9.9.2.1)	+	+
One of the tests: flattening, bending or stretching a circular sample (9.9.3)	+	+
A test for the distribution of a piece of pipe or a ring sample (9.9.4)	+	+
Non-destructive testing to detect longitudinal defects (9.9.8.1)	-	+
Checking the steel grade (9.9.9)	+	+
Additional	Analysis of the chemical composition of pipes (9.9.1)	+	+
The tensile test at elevated temperature (9.9.2.2)	+	+
Impact bending test at room temperature (9.9.5.1)	+	+
Impact bending test at a reduced temperature for pipes with a wall thickness of 6 mm or more (9.9.5.2)	+	+
Non-destructive testing to detect transverse defects (9.9.8.2)	-	+
Non-destructive testing of pipe ends for the identification of bundles (9.9.8.3)	+	+
Intergranular corrosion resistance test (6.4 and 9.9.6)	+	+
If agreed between the manufacturer and the customer and specified in the order.

Test categories I and II are applicable only to the certificate of technical inspection (ISO 10474−3.1.A, 3.1.B or 3.1.C) or acceptance certificate (ISO 10474, 3.2).

9.3 Control of the chemical composition

9.3.1 The control analysis of the chemical composition of the pipes may be agreed between the manufacturer and the customer and specified in the order (9.9.1).

9.3.2 The number of sampled samples for analysis must be agreed between the manufacturer and the customer and stated in the order.

9.3.3 Samples shall be taken in accordance with ISO 14284. Samples may be selected:

a) from samples for mechanical testing;

b) from the same pipe section as the samples for mechanical testing.

9.4 Mechanical and technological tests

9.4.1. Tests at room temperature

9.4.1.1 Party

When carrying out acceptance testing, the acceptance of pipes is carried out in batches.

The batch of pipes in the state after heat treatment during hot deformation should consist of pipes of the same steel grade, one melting, one manufacturing technology, one outer diameter and wall thickness.

The batch of pipes in the state after solution heat treatment should consist of pipes of the same steel grade, one heat, one manufacturing technology, one outside diameter and wall thickness, with the pipes to be thermally treated in one mode in a continuous furnace or in one cage in a batch oven.

Each lot must consist of 100 pipes. The remaining pipes are 50 pcs. or less after the formation of lots should be divided into other order lots. The remaining pipes are more than 50 pcs. take a separate batch.

If the total number of pipes is less than 100 pieces, they are accepted in one lot.

9.4.1.2 Number of pipes to be tested

For testing, the following is selected:

— one pipe from each lot for tests of category I;

— two pipes from each lot for tests of category II, except for the tests of 9.9.3 and 9.9.4;

— 10% of the pipes from each lot for tests of categories II to 9.9.3 and 9.9.4.

9.4.1.3. Number of tests

For each selected pipe, the following tests shall be carried out:

— one tensile test at room temperature (9.9.2.1);

— one of the tests: flattening, bending or stretching the annular sample (9.9.3);

— one test for the distribution of a piece of pipe or a ring sample (9.9.4).

9.4.1.4 Sampling and test specimens

Samples and test samples are taken from the ends of the pipes in accordance with ISO 377−1.

9.4.1.5 Location and orientation of test specimens

9.4.1.5.1. A tensile test specimen

Tensile tests are carried out on a piece of pipe of full cross-section, longitudinal or transverse specimens conforming to ISO 6892.

At the choice of the manufacturer:

— for pipes with an external diameter of 219.1 mm or less, the test is carried out on a section of a pipe of full cross-section or on a longitudinal sample

— for pipes with an external diameter of more than 219.1 mm, the tests are carried out on a longitudinal or transverse sample.

9.4.1.5.2 Sample for flattening test

Flattening tests are carried out on a section of a pipe of full cross-section corresponding to ISO 8492. The test is not carried out for pipes with an outer diameter of more than 400 mm.

9.4.1.5.3. A sample for bending test

Bend tests are carried out on a section of a pipe of full cross-section corresponding to ISO 7438. For pipes with a wall thickness of more than 20 mm, a test in the form of a strip cut in the transverse direction, with a width of 19 mm and a length of 38 mm is allowed.

9.4.1.5.4 Samples for testing the distribution of a piece of pipe, the distribution of a ring sample, or the extension of a ring sample

Tests for the distribution of a piece of pipe, for the distribution of a ring sample or for the extension of an annular sample are carried out according to ISO 8493, ISO 8495, ISO 8496, respectively. Tests are not carried out on pipes with an external diameter of more than 400 mm.

9.4.1.5.5 Specimens for impact bending tests

Tests for impact bending are carried out at the request of the customer. Three transverse samples of full size are cut from each selected tube (10 10 mm) with a V-notch. If the pipe size does not allow the sample to be made without straightening it, a longitudinal sample is cut out.

The incision axis of the sample must be perpendicular to the surface of the pipe.

For pipes with a wall thickness of more than 30 mm, the center line of the sample shall be located at a distance to the outer surface of the pipe approximately equal to one-fourth the wall thickness.

9.4.2. Tests at elevated temperature

Norms of yield stresses and , the temperature and the number of specimens for tensile tests at elevated temperature (9.9.2.2) shall be agreed between the manufacturer and the customer.

9.4.3. Low temperature test

For pipes with a wall thickness of 6 mm or more, the impact test at a reduced temperature is carried out at the request of the customer. The test temperature must be agreed between the manufacturer and the customer.

The shape and dimensions of the test pieces must comply with ISO 148.

9.4.4 Intergranular corrosion resistance tests

If intergranular corrosion resistance tests are required, the number of samples must be agreed between the manufacturer and the customer

Special requirements for the selection and manufacture of samples must be agreed between the manufacturer and the customer.

9.5. Monitoring of continuity

9.5.1 All pipes shall be checked for continuity.

9.5.2 Unless otherwise specified in the order, a hydrostatic test of continuity at the manufacturer’s option may be replaced by a non-destructive continuity check (9.9.7.2).

9.6 Checking the dimensions

The pipes are subjected to size control.

The outer diameter is measured in the cross section of the pipes. Pipes with an outer diameter of more than 457 mm are measured along the circumference by a measuring tape with further recalculation. In case of disagreement, the diameter of the pipes is measured in cross section.

If the order does not specify otherwise, the wall thickness is measured at the ends of the pipes.

9.7 Visual inspection

All pipes are visually checked for compliance with the requirements of 8.1 and 8.2.

9.8 Non-destructive testing

9.8.1. Pipes of test category II shall be subjected to nondestructive testing to detect longitudinal defects (9.9.8.1).

9.8.2 Pipes of test category II shall be subjected to non-destructive testing at the request of the customer to detect transverse defects (9.9.8.2).

9.8.3 The ends of pipes with a wall thickness of more than 40 mm shall be subjected to non-destructive testing at the request of the customer to identify delaminations (9.9.8.3).

9.9 Methods and evaluation of test results

9.9.1 Analysis of the chemical composition of pipes

9.9.1.1 Analysis of the chemical composition of the pipes shall be carried out at the request of the customer (9.3.1 and 9.3.2).

9.9.1.2 Chemical elements shall be determined by methods specified in relevant international standards. You can use the method of spectral analysis.

9.9.1.3 The results of the chemical analysis shall be in accordance with Table 1, taking into account the permissible deviations specified in Table 2.

9.9.1.4 In case of disagreement in the application of analytical methods, the chemical composition of the pipes shall be determined in accordance with ISO / TR 9769.

9.9.2. Tensile tests

9.9.2.1. The tensile test at room temperature

9.9.2.1.1. The tensile test at room temperature shall be carried out in accordance with ISO 6892 (see also 9.4.1.3 and 9.4.1.5.1).

9.9.2.1.2. In the tensile test at room temperature, the ultimate strength , yield strength and relative extension .

The relative elongation is determined at the design length of the sample of 5.65 , where is the area of the original cross section. If another design length is used, the elongation is determined in accordance with ISO 2566−2.

9.9.2.1.3 The results of the tensile tests shall comply with the requirements specified in Table 3 for the relevant steel grades.

9.9.2.2. Tensile test at elevated temperature

9.9.2.2.1. The tensile test at elevated temperature (9.4.2) shall be carried out in accordance with ISO 6892−2 at the request of the customer.

9.9.2.2.2. When carrying out the tensile test at an elevated temperature, yield limits shall be determined and .

9.9.2.2.3. The results of the tensile test shall meet the requirements specified in Table 4 for the appropriate temperature.

9.9.3. Flattening, bending or stretching tests of a ring specimen

9.9.3.1 General

For pipes with an external diameter of 200 mm or more, at the manufacturer’s choice, one of the tests for flattening, bending or stretching the ring (9.4.1.3) is carried out at room temperature. For pipes with an outer diameter of 152.4 to 200 mm, one of the tests is carried out at the manufacturer’s choice: flattening or stretching the annular sample. For pipes with an outside diameter of less than 152.4 mm, a flattening test is carried out.

9.9.3.2 Flattening test

9.9.3.2.1 The flattening test shall be carried out in accordance with ISO 8492.

The end of the pipe or the length of the pipe is flattened until the distance between the flattening surfaces , calculated by the formula

, (1)

Where  — distance between flattening surfaces, measured under load, mm;

 — coefficient of deformation (Table 3);

 — nominal wall thickness, mm;

 — The nominal outer diameter, mm.

9.9.3.2.2. After the test, there shall be no cracks or tears visually determined on the specimen, with the presence of small cracks on the edges of the specimen.

For pipes with a ratio Less than 10 small cracks on the internal surface of the sample are allowed in the cross-sectional positions «6 h» and «12 h».

9.9.3.3 Bend test

9.9.3.3.1 The bend test (9.4.1.3) is carried out in accordance with ISO 7438. The sample is bent at room temperature in the direction of the original curvature by an angle of 180 ° around the mandrel with a diameter of 3 .

9.9.3.3.2. After the test, there shall be no cracks or tears visually determined on the specimen, with the presence of small cracks on the edges of the specimen.

9.9.3.4 Tensile test of a ring specimen

9.9.3.4.1. The tensile test of the ring specimen shall be carried out for pipes with an outer diameter of 152.4 mm or more.

The tensile test is carried out in accordance with ISO 8496.

9.9.3.4.2. The sample (9.4.1.5.4) is subjected to deformation in the transverse direction before fracture.

9.9.3.4.3. After the test, there shall be no cracks visually determined on the specimen.

9.9.4. Test for the distribution of a piece of pipe or a ring sample

9.9.4.1 General

The distribution test at room temperature, at the manufacturer’s choice, is carried out on a piece of pipe or an annular sample (9.4.1.3).

9.9.4.2 Test for the distribution of a piece of pipe

9.9.4.2.1 A test for the distribution of a piece of pipe shall be carried out in accordance with ISO 8493.

The distribution test is carried out for pipes with an external diameter of not more than 150 mm and a wall thickness of not more than 9 mm.

The end of the pipe section (9.4.1.5.4) is subjected to a conical mandrel until the outer diameter indicated in Table 3 for the corresponding steel grade is increased.

9.9.4.2.2. After the test, there shall be no cracks or tears on the surface of the pipe segment, which are determined visually. This allows the presence of small cracks on the edges of the length of the pipe.

9.9.4.3 Circular sample distribution test

The circular sample distribution test is carried out in accordance with ISO 8495.

The sample is considered to have passed the test if, with an increase in its internal diameter of not less than 40%, there are no signs of destruction, determined visually.

9.9.5 Impact bending test

9.9.5.1 Impact bending test at room temperature

9.9.5.1.1. The impact bending test at room temperature shall be carried out for pipes with a wall thickness of 6 mm or more (9.4.1.5.5) in accordance with ISO 148, as required by the customer. The impact work is defined as the arithmetic mean of the test results of the three samples.

9.9.5.1.2 Impact performance shall comply with the requirements specified in Table 3 for the relevant steel grade, with one sample being allowed to reduce impact performance by no more than 30% of the standard value.

9.9.5.1.3 When the unsatisfactory results of the impact test are obtained, it is repeated on three additional samples in accordance with ISO 148.

9.9.5.1.4. The impact of the impact on the test results of six samples shall comply with the requirements specified in Table 3 for the relevant grade of steel, while two samples shall be allowed to reduce impact, including on one sample not more than 30% of the norm.

9.9.5.2. Test for impact bending at a reduced temperature

9.9.5.2.1 For pipe with a wall thickness of 6 mm or more, as required by the customer, impact bending tests at a reduced temperature (9.4.3) are performed in accordance with ISO 148. The test temperature selected in accordance with Table B.1 (Annex B), must be agreed between the manufacturer and the customer. The impact work is defined as the arithmetic mean of the test results of the three samples.

9.9.5.2.2 Impact work shall comply with the requirements specified in Table B.1 for the relevant steel grade, while a single sample shall not be reduced by more than 30% of the standard value.

9.9.5.2.3 When the unsatisfactory results of the impact test are obtained, it shall be repeated on three additional samples in accordance with ISO 148.

9.9.5.2.4 Impact work on the test results of six samples shall comply with the requirements specified in Table B.1 for the relevant steel grade, with two samples being allowed to reduce the impact, including on one sample, by no more than 30% normative value.

9.9.6 Intergranular corrosion resistance test

Unless otherwise agreed, the intergranular corrosion resistance test shall be carried out in accordance with ISO 3651−1 or ISO 3651−2.

9.9.7 Continuity monitoring

9.9.7.1. The hydrostatic pressure test

The test pressure, determined by the following formula, should not exceed 8 N / mm

, (2)

Where  — test pressure, N / mm ;

 — allowable stress in the pipe wall equal to 80% of the minimum yield point , indicated in Table 3 for the corresponding grade of steel, N / mm ;

 — nominal wall thickness, mm;

 — The nominal outer diameter, mm.

Pipes are kept under test pressure for at least 5 seconds.

Pipes must withstand the test without detecting leaks and permanent deformation, leading to pipe sizes beyond the limit values.

9.9.7.2 Non-destructive testing of continuity

If the pipes are not subjected to a hydrostatic pressure test (9.9.7.1), they are subjected to one of the following tests (9.5.2):

a) Electromagnetic monitoring in accordance with ISO 10893−1;

b) ultrasonic testing in accordance with ISO 10332;

c) one of the following special tests:

1) pneumatic test in water at an air test pressure of 0.6 N / mm with a holding time under pressure of not less than 5 s;

2) a pneumatic test using a foaming solution at a test pressure of 0.03 N / mm .

9.9.8 Non-destructive testing

9.9.8.1. Pipes of test category II shall be ultrasonically inspected to detect longitudinal defects in accordance with ISO 10893−10, with acceptance level U2.

9.9.8.2 At the request of the customer, the pipes of test category II shall be ultrasonically inspected to detect transverse defects in accordance with ISO 10893−10, with acceptance level U2.

9.9.8.3 At the request of the customer, pipe ends with a wall thickness of more than 40 mm shall be ultrasonically inspected for stratification in accordance with ISO 11496.

9.9.9 Checking the steel grade

To check the steel for the presence of alloying elements, use the appropriate method.

9.10 Unsatisfactory tests

In case of unsatisfactory test results, they are delivered in accordance with the requirements of ISO 404.

9.11 Repeated trials

Repeated tests are carried out in accordance with ISO 404.

9.12 Culling and Recycling

The rejection and processing of pipes is carried out in accordance with ISO 404.