Foreword this standard is drafted according to the rules given in GB / t1.1-2009.
This standard replaces GB / t21237-2007 wide and thick steel plates for oil and gas transmission pipes. Compared with GB / t21237-2007, the main technical changes are as follows:
- ——- modified the thickness range of 6mm-50mm (see Chapter 1, Chapter 1 of 2007 Edition);
- ——- the classification, brand indication method and code are modified; the classification and code are added, and the brand indication method is divided into different brands according to different delivery status (see Chapter 3, Chapter 3 of 2007 Edition);
- ——- PSL1 and PSL2 quality grades are added, brand l210 / A and relevant regulations are added to PSL1 quality grade; two brand l625m / x90m and l830m / x120m and relevant regulations are added to PSL2 quality grade (see Table 1, table 2, table 3 and table 4);
- ——- the order content has been modified (see Chapter 4, Chapter 4 of 2007 Edition);
- ——- the provisions on size, shape, weight and allowable deviation are modified (see Chapter 5, Chapter 5 of 2007 Edition); the chemical composition, mechanical and technological properties of each brand are modified (Table 2, table 3, table 4, table 1, table 2, table 3 of 2007 Edition);
- ——- the regulation of smelting method has been modified (see 6.3, 2007 version 6.2);
- ——- revised the delivery status (see 6.4, 2007 version 6.3);
- ——- added provisions on grain size, non-metallic inclusion and banded structure (see 6.6, 6.7 and 6.8); – modified provisions on surface quality and special requirements (see 6.9 and 6.10, 2007 versions 6.5 and 6.7); – modified provisions on test method, packaging, marking and quality certificate (see Chapter 9, 2007 version, Chapter 9);
- ——- added rules for rounding off of numerical values (see 8.5);
- ——- Appendix A of the original standard (2007 Edition Appendix A) was deleted. This standard is proposed by China Iron and Steel Industry Association. book
The standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC / tc183).
Drafting units of this standard: Shougang Group Co., Ltd., metallurgical industry information standard research institute, Jiangsu Shagang Group Co., Ltd., Hunan Hualing Xiangtan Iron and Steel Co., Ltd., Guangzheng Energy Co., Ltd., gangyannake Testing Technology Co., Ltd. and Magang (Group) Holding Co., Ltd.
Main drafters of this standard: Shi Li, Shen qinyi, Li Shaobo, Zhang Weixu, Li Xiaobo, Luo Deng, Zhou Dong, Xu Peng, Li Zhongyi, Ding Wenhua, Nie Wenjin, Xiong Xiangjiang, Ma Changwen, Jia Zhigang. The previous versions of the standards replaced by this standard are as follows:
- ———GB/T21237—1997、GB/T21237—2007
Wide and thick steel plates for oil and gas pipelines
1.Scope
This standard specifies the classification and brand indication method, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificates of wide and thick steel plates for oil and gas transmission pipes.
This standard is applicable to the wide and thick steel plate (hereinafter referred to as steel plate) with a thickness of 6 mm ~ 50 mm for oil and natural gas transmission pipes produced in accordance with iso3183, GB / t9711 and apispec5l, etc. other wide and thick steel plates for fluid transmission and welding pipes can also refer to this standard.
- Normative references
The following documents are essential for the application of this document. For dated references, only the dated version is applicable to this document. For undated references, the latest version (including all amendments) is applicable to this document.
GB / t223.5 steel determination of acid soluble silicon and total silicon content reduced molybdosilicate spectrophotometric method.
GB / t223.12 methods for chemical analysis of iron, steel and alloy the sodium carbonate separation diphenylcarbazide photometric method for the determination of chromium content.
GB / t223.16 methods for chemical analysis of iron, steel and alloy The chromotropic acid photometric method for the determination of titanium content.
GB / t223.19 methods for chemical analysis of iron, steel and alloy the neocuproine chloroform extraction photometric method for the determination of copper content.
GB / t223.26 steel and alloy determination of molybdenum content thiocyanate spectrophotometric method.
GB / t223.40 steel and alloy determination of niobium content chlorosulfonol s spectrophotometric method.
GB / t223.54 methods for chemical analysis of iron, steel and alloy the flame atomic absorption spectrometric method for the determination of nickel content.
GB / t223.58 methods for chemical analysis of iron, steel and alloy the sodium arsenite sodium nitrite titration method for the determination of manganese content.
GB / t223.59 steel and alloy determination of phosphorus content bismuth phosphomolybdate blue spectrophotometry and antimony phosphomolybdate blue spectrophotometry.
GB / t223.68 methods for chemical analysis of iron, steel and alloy the potassium iodate titrimetric method for the determination of sulfur content after combustion in a tubular furnace.
GB / t223.69 steel and alloy determination of carbon content gas volumetric method after combustion in tubular furnace.
GB / t223.76 methods for chemical analysis of iron, steel and alloy the flame atomic absorption spectrometric method for the determination of vanadium content. GB / t223.78 methods for chemical analysis of iron, steel and alloy The curcumin direct photometric method for the determination of boron content.
GB / t228.1 metallic materials tensile test Part 1: room temperature test method.
GB / t229 metallic materials Charpy pendulum impact test method.
GB / t232 test method for bending of metallic materials.
GB / t247 general provisions for packaging, marking and quality certificate of steel plate and strip.
GB / t709 dimension, shape, weight and allowable deviation of hot rolled steel plate and strip.
GB / t2975 steel and steel products – sampling locations and preparation of test specimens for mechanical properties tests.
GB / t4336 carbon and low alloy steels – Determination of multi-element content – spark discharge atomic emission spectrometric method (routine method).
GB / t4340.1 metallic materials Vickers hardness test Part 1: Test methods.
GB / t6394 metal determination of average grain size.
GB / T8170 rules for rounding off values and expression and determination of limit values.
GB / t8363 drop weight tear test method for ferritic steel.
GB / t10561 steel – Determination of non-metallic inclusion content – modified Micrographic method for standard parts.
GB / t13299 evaluation method of microstructure of steel.
GB / t14977 General requirements for surface quality of hot rolled steel plate 1.
GB/T21237—2018。
GB / t17505 general technical requirements for steel and steel products delivery.
GB / t20066 methods of sampling and sample preparation for the determination of chemical composition of steel and iron.
GB / t20123 steel determination of total carbon and sulfur content infrared absorption method after combustion in high frequency induction furnace (routine method).
GB / t20125 low alloy steel determination of multi elements inductively coupled plasma atomic emission spectrometry.
- Classification and brand representation
3.1 Classification
3.1.1 according to the quality level:
a) quality level 1 (PSL1);
b) quality level 2 (PSL2).
Note: PSL2 includes requirements for increased chemical composition, mechanical properties, toughness, grain size, non-metallic inclusions, hardness, etc. If the requirements applicable to a particular PSL level are not indicated, the same applies to PSL1 and PSL2.
3.1.2 by product use:
a) steel for natural gas transmission pipeline;
b) steel for crude oil and product oil pipelines;
c) steel for other fluid transfer welded pipe.
3.1.3 according to the delivery status:
a) hot rolling (R);
b) normalizing and normalizing rolling (n);
c) hot mechanical rolling (m); d) quenching + tempering (q).
3.1.4 according to the edge state:
a) edge cutting (EC);
b) no trimming (EM).
3.2 brand representation
3.2.1 the steel brand is composed of the first English letter of “line” representing the transmission pipeline, the specified minimum yield strength value of steel pipe and delivery status (PSL2 quality level only).
Example: l415m.
L — the first English letter representing the “line” of the transmission pipeline;
415 – represents the specified minimum yield strength value of steel pipe, unit: MPa;
M — represents that the delivery status is TMCP.
3.2.2 in addition to the naming in 3.2.1, other brands often used are also given in Table 1.
The brand consists of “X” representing pipeline steel, the specified minimum yield strength value of steel pipe and delivery status (PSL2 quality level only).
Example: x60m.
X —represents pipeline steel;
60—represents the specified minimum yield strength value of steel pipe, unit: Ksi (1ksi = 6.895mpa);
M —represents that the delivery status is TMCP.
Note: the specified minimum yield strength is not included in grades A and B.
3.2.3 see Table 1 for the delivery status and brand of PSL1 and PSL2 steel.
3.2.4 refer to Appendix A for the comparison table of this standard brand and relevant standard brand.
Post time: Aug-31-2021