GB/T 20878-2024 (GB/T20878-2024, GBT 20878-2024, GBT20878-2024)
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Stainless steels - Designation and chemical composition
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GB/T 20878-2024
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Standards related to: GB/T 20878-2024
| Standard ID | GB/T 20878-2024 (GB/T20878-2024) | | Description (Translated English) | Stainless steels - Designation and chemical composition | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H40 | | Classification of International Standard | 77.140.20 | | Word Count Estimation | 66,645 | | Date of Issue | 2024-07-24 | | Date of Implementation | 2025-02-01 | | Older Standard (superseded by this standard) | GB/T 20878-2007 | | Drafting Organization | Metallurgical Industry Information Standards Research Institute, Shanxi TISCO Stainless Steel Co., Ltd., Fujian Qingtuo Special Steel Technology Research Co., Ltd., Iron and Steel Research Institute Co., Ltd., Huzhou Yongxing Special Stainless Steel Co., Ltd., Fushun Special Steel Co., Ltd., Jiangsu Yinhuan Precision Steel Pipe Co., Ltd., Gansu Jiugang Group Hongxing Steel Co., Ltd., Jiangsu Wujin Stainless Co., Ltd., National Carbon Structural Steel Product Quality Inspection and Testing Center (Shandong), Sinopec Engineering Construction Co., Ltd., Shandong Special Equipment Inspection and Research Institute Group Co., Ltd., Shandong Taishan Iron and Steel Group Co., Ltd., Zhejiang Jiuli Special Materials Technology Co., Ltd., Xinghua Juxin Stainless Steel Co., Ltd., Tai Tiansheng Stainless Steel Products Co., Ltd., Taizhou Jiqiang Stainless Steel Products Co., Ltd., Zhejiang Zhengtong Pipe Industry Co., Ltd. | | Administrative Organization | National Technical Committee on Steel Standardization (SAC/TC 183) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 20878-2024.Stainless steel grades and chemical compositions
GB/T 20878-2024 English version. Stainless steels - Designation and chemical composition
ICS 77.140.20
CCSH40
National Standard of the People's Republic of China
Replace GB/T 20878-2007
Stainless steel grades and chemical composition
Released on 2024-07-24
2025-02-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 20878-2007 "Stainless steel and heat-resistant steel grades and chemical compositions".
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) "Heat-resistant steel" was deleted from the scope (see Chapter 1, Chapter 1 of the.2007 edition);
b) The term and definition of "heat-resistant steel" have been deleted (see Chapter 2 of the.2007 edition);
c) The definitions of “austenitic-ferritic (duplex) stainless steel” and “austenitic-ferritic (duplex) stainless steel” have been changed (see Chapter 3, Chapter 2 of the.2007 edition);
d) The criteria for determining the limit values of manganese, phosphorus, nitrogen and copper content have been changed (see 4.3, 3.3 of the.2007 edition);
e) Added the provisions on the representation of stainless steel grades and unified digital codes (see Chapter 5 and Appendix A);
f) Modified some unified digital code representation methods (see Table 1 to Table 5, Table B.1, Table C.1, Table 1 to Table 5,.2007 Edition
Table A.1, Table B.1, Table C.1);
g) The chemical compositions of 8 grades have been changed (see Table 1, Table 2, Table 3 and Table 5, Table 1, Table 2, Table 3 and Table 5 of the.2007 edition);
h) 97 grades and chemical compositions were added, including 51 austenitic stainless steels, 51 austenitic-ferritic (duplex) stainless steels
14, ferritic stainless steel 23, martensitic stainless steel 8, precipitation hardening stainless steel 1 (see Table 1 to Table 5,.2007 Edition
Table 1 to Table 5);
i) Deleted 23 grades and their chemical compositions (see Tables 1 to 5,.2007 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. Metallurgical Industry Information Standards Research Institute, Shanxi Taigang Stainless Steel Co., Ltd., Fujian Qingtuo Special Steel Technology Research Institute
Research Co., Ltd., Central Iron and Steel Research Institute Co., Ltd., Huzhou Yongxing Special Stainless Steel Co., Ltd., Fushun Special Steel Co., Ltd., Jiangsu Yin
Huan Precision Steel Pipe Co., Ltd., Gansu Jiugang Group Hongxing Steel Co., Ltd., Jiangsu Wujin Stainless Steel Co., Ltd., National Carbon Structure
Structural Steel Product Quality Inspection and Testing Center (Shandong), Sinopec Engineering Construction Co., Ltd., Shandong Special Equipment Inspection and Research Institute Group Co., Ltd.
Company, Shandong Taishan Iron and Steel Group Co., Ltd., Zhejiang Jiuli Special Materials Technology Co., Ltd., Xinghua Juxin Stainless Steel Co., Ltd., Taizhou
Tiansheng Stainless Steel Products Co., Ltd., Taizhou Jiqiang Stainless Steel Products Co., Ltd., Zhejiang Zhengtong Pipe Industry Co., Ltd., Zhejiang Compass Flow
Body Technology Co., Ltd.
The main drafters of this document are. Luan Yan, Wu Qiang, Jiang Laizhu, Song Zhigang, Chen Genbao, Gu Qiang, Liu Yu, Pan Jixiang, Hou Xiaolong, Hua Yangkang,
Wang Jinguang, Shao Yu, Wang Zhiyu, Shi Xianyun, Feng Han, Zhang Yong, Zhao Kun, He Xikou, Liu Ming, Liu Zhenbao, Li Yufeng, Chen Liang, Fei Ting, Wang Chunmao,
Wu Yuhong, Liu Yonghua, Gu Fengquan, Ji Youlu, Ding Binhua, Zhang Jingjing, Chen Qingxin, Li Zhaoguo, Yang Xin, Gong Yueqiang.
The previous versions of this document and the documents it replaces are as follows.
---First published in 1984 as GB/T 4229-1984;
---First revised in.2007 to GB/T 20878-2007;
---This is the second revision.
Stainless steel grades and chemical composition
1 Scope
This document specifies the grades and unified numerical codes of stainless steel and their chemical composition, and gives the physical properties, grades and unified numerical codes of some grades.
A comparison table of digital codes and foreign standard grades (or similar grades), etc.
The stainless steel grades and unified numerical codes and chemical compositions specified in this document are applicable to the guidance of stainless steel (including ingots and semi-finished products).
Formulation and revision of product standards.
Note. In this document, the content of each element representing the chemical composition of stainless steel is expressed in mass fraction.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 8170 Rules for rounding off values and expression and determination of limit values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Stainless steel
Steel with a chromium content of at least 10.5% (mass fraction) and a carbon content of not more than 1.2% (mass fraction).
Note. Stainless steel is divided into corrosion-resistant steel, heat-resistant steel and creep-resistant steel according to its main characteristics.
3.2
Austenitic stainless steel
The matrix is mainly composed of austenite with a face-centered cubic crystal structure, and the stainless steel is mainly strengthened by cold working or nitrogen alloying.
3.3
Austenitic-ferritic (duplex) stainless steel
The matrix has both austenite and ferrite phases (the content of the lesser phase is at least 25%), which can be strengthened by cold working.
Stainless steel.
3.4
Ferritic stainless steelferriticstainlesssteel
The matrix is mainly composed of ferrite with a body-centered cubic crystal structure, which generally cannot be hardened by heat treatment, but can be slightly strengthened by cold working.
of stainless steel.
3.5
Martensitic stainless steelmartensiticstainless steel
The matrix is mainly composed of martensite with a distorted centroidal cubic crystal structure, and the mechanical properties of the stainless steel can be adjusted through heat treatment.
3.6
Precipitation hardening stainless steel
Stainless steel with a matrix mainly composed of martensite or austenite structure, which can be hardened (strengthened) by precipitation hardening (also known as aging hardening).
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