GB/T 20878-2007 (GB/T20878-2007, GBT 20878-2007, GBT20878-2007)
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Standard ID | GB/T 20878-2007 (GB/T20878-2007) | Description (Translated English) | Stainless and heat-resisting 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| Word Count Estimation | 45,456 | Date of Issue | 2007-03-09 | Date of Implementation | 2007-10-01 | Older Standard (superseded by this standard) | GB/T 4229-1984 | Drafting Organization | Metallurgical Industry Information Standards Institute | Administrative Organization | National Steel Standardization Technical Committee | Regulation (derived from) | China National Standard Approval Announcement2007 No.3 (Total No.103) | Proposing organization | China Iron and Steel Association | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This standard specifies the stainless steel and heat-resistant steel grades and chemical composition (see Table 1 to Table 5), and in the form of data included in the appendix of the physical parameters of certain brands, foreign standard grades table, stainless and heat resisting steels grades applicable standards. |
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).
GB/T 20878-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.20
H40
Replacing GB/T 4229-1984
Stainless and heat-resisting steels –
Designation and chemical composition
ISSUED ON. MARCH 9, 2007
IMPLEMENTED ON. OCTOBER 1, 2007
Issued by. General Administration of Quality Supervision, Inspection;
Quarantine of the People's Republic of China (GAQSIQ);
Standardization Administration of China (SAC).
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Terms and definitions ... 4
3 General rules for identifying chemical constitution limits ... 5
4 Chemical composition and application of stainless steel and heat resisting steel ... 7
Annex A ... 21
Annex B ... 27
Annex C ... 34
References ... 42
Foreword
Chemical constitution limit and designation time specified in this Standard is
applicable to formulate and revise product standard for stainless steel and refractory
steel (including steel ingot and half-finished product).
This Standard needs to be used with other technical standards; it can not be used for
ordering.
This Standard replaces GB/T 4229-1984 “Methods of weight calculation of stainless
steel plates and sheets" since the date of implementation.
Annex A, Annex B and Annex C of this Standard are informative.
This Standard was proposed by China Iron & Steel Association.
This Standard shall be under the jurisdiction of national steel standardization technical
committee.
Drafting organization of this Standard. China Metallurgical Information Standardization
Research Institute.
Main Drafters of this Standard. Luan Yan, Dai Qiang and Liu Baoshi.
Stainless and heat-resisting steels –
Designation and chemical composition
1 Scope
This Standard specifies the designation and its chemical constitution of stainless steel
and heat resisting steel (see Table 1 ~ Table 5). Physical parameter of some
designations, overseas standards designation or approximate designation parallel
table, stainless steel and heat resisting steel designation criterion of acceptability are
specified in the Informative Annex.
Chemical constitution limit and its designation time specified in this Standard are
applicable to formulating and revising the product standard for stainless steel and its
refractory steel (including steel ingot and its half-finished product).
2 Terms and definitions
The following terms and definitions are applicable to this Standard.
2.1
Stainless steel
Steel that does not rust and corrosion-resistant, of which the chromium content is at
least 10.5%, carbon content is at least 1.2%.
2.1.1
Austenitic grade stainless steel
Stainless steel of which the base is with face-centered cubic crystal austenite
structure (gamma phase), antimagnetic. This kind of stainless steel is intensified (may
cause magnetism) through cold-working.
2.1.2
Austenitic-ferritic (duplex) grade stainless steel
Stainless steel of which the base is with austenite and ferrite (one with less phrase is
more than 15%). The stainless steel is with magnetic property and can be intensified
through cold-working.
2.1.3
Ferritic grade stainless steel
Stainless steel of which the base is with space centered cubic lattice iron chain tissue
(alpha phase) and with magnetic property. It cannot be hardened through heat
treatment, but cold-working can lightly intensify it.
2.1.4
Martensitie grade stainless steel
Stainless steel of which the base is the magnetic martensitic structure. Through heat
treatment, mechanical property can be adjusted.
2.1.5
Precipitation hardening grade stainless steel
Stainless steel of which the base is austenite or martensitic structure. it can be
hardened through precipitation hardening (age hardening).
2.2
Heat-resisting steel
Steel with good chemical stability or higher strength at high temperature.
3 General rules for identifying chemical constitution
limits
3.1 Carbon
If carbon content is greater than or equal to 0.04%, it is recommended to take two
digits; if carbon content is not greater than 0.030%, it is recommended to take 3 digits.
3.2 Manganese
Apart from Cr-Ni-Mn, it is recommended to use 2.00% and 1.00% (maximum value),
but it does not include automatic steel containing high sulphur or selenium or steel
that need to raise nitrogen solid solubility.
3.3 Phosphor
Unless related producer recommend using lower limit due to technical reasons, it is
recommended to be with at minimum 0.045% phosphor for austenitic steel. Phosphor
content for other kind of steel shall not be greater than 0.040%, but is does not include
automatic steel.
3.4 Sulfur
Table 1 Austenitic grade stainless steel, heat resisting steel designation and its chemical composition
Serial
number
Unified
numerical name New designation Old designation
Chemical constitution (mass fraction)/%
C Si Mn P S Ni Cr Mo Cu N Other elements
1 S35350 12Cr17Mn6Ni5N 1Cr17Mn6Ni5N 0.15 1.00 5.50~7.50 0.050 0.030 3.50~5.50 16.00~18.00 — — 0.05~0.25 —
2 S35950 10Cr17Mn9Ni4N 0.12 0.80 8.00~10.50 0.035 0.025 3.50~4.50 16.00~18.00 — — 6.15~0.25 —
3 S35450 12Ci18Mn9Ni5N 1Ci18Mn8Ni5N 0.15 1.00 7.50~10.00 0.050 0.030 4.00~6.00 17.00~19.00 — — 0.05~0.25 —
4 S35020 20Cr13Mn9Ni4 2Cr13Mn9Ni4 0.15~0.25 0.80 8.00~10.00 0.035 0.025 3.70~5.00 12.00~14.00 — — — —
5 S35550 20Cr15Mn15Ni2N 2Cr15Mn15Ni2N 0.15~0.25 1.00 14.00~16.00 0.050 0.030 1.50~3.00 14.00~16.00 — — 0.15~0.30 —
6 S35650 53Cr21Mn9Ni2N 5Cr21Mn9Ni4Na 0.48~0.58 0.35 8.00~10.00 0.040 0.030 3.25~1.50 20.00~22.00 — — 0.35~0.50 —
7 S35750 26Cr18Mn12Si2Na 3Cr18Mn12Si2Na 0.22~0.30 1.40~2.20 10.50~12.50 0.050 0.030 — 17.00~19.00 — — 0.22~0.33 —
8 S35850 22Cr20Mn10Ni2Si2Na 2Cr20Mn9Ni2Si2Na 0.17~0.26 1.80~2.70 8.50~11.00 0.050 0.030 2.00~3.00 16.00~21.00 — — 0.20~0.30 —
9 S30110 12Cr17Ni7 1Cr17Ni7 0.15 1.00 2.00 0.045 0.030 6.00~5.00 16.00~18.00 — — 0.10 —
10 S30103 022Cr17Ni7 0.030 1.00 2.00 0.045 0.030 5.00~8.00 16.00~18.00 — — 0.20 —
11 S30153 022Cr17Ni7N 0.030 1.00 2.00 0.045 0.030 5.00~8.00 16.00~18.00 — — 0.07~0.20 —
12 S30220 17Cr18Ni9 2Cr18Ni9 0.13~0.21 1.00 2.00 0.035 0.025 8.00~10.50 17.00~19.00 — — — —
13 S30210 12Cr18Ni9a 1Cr18Ni9a 0.15 1.00 2.00 0.045 0.030 8.00~10.00 17.00~19.00 — — 0.10 —
14 S30240 12Cr18Ni9Si3a 1Cr18Ni9Si3a 0.15 2.00~3.00 2.00 0.045 0.030 8.00~10.00 17.00~19.00 — — 0.10 —
15 S30317 Y12Cr18Ni9 Y1Ci18Ni9 0.15 1.00 2.00 0.20 ≥0.15 8.00~10.00 17.00~19.00 (0.60) — — —
16 S30327 Y12Cr18Ni9Se Y1Cr18Ni9Se 0.15 1.00 2.00 0.20 0.060 8.00~10.00 17.00~19.00 — — — Se≥0.15
17 S30408 06Cr19Ni10a 0Cr18Ni9a 0.08 1.00 2.00 0.045 0.030 8.00~11.00 18.00~20.00 — — — —
18 S30403 022Cr19Ni10 00Cr19Ni10 0.030 1.00 2.00 0.045 0.030 8.00~12.00 18.00~20.00 — — — —
19 S30409 07Cr19Ni10 0.04~0.10 1.00 2.00 0.045 0.030 8.00~11.00 18.00~20.00 — — — —
20 S30450 05Cr19Ni10Si2CeN 0.04~0.06 1.00~2.00 0.80 0.045 0.030 9.00~10.00 18.00~19.00 — — 0.12~0.18 Ce0.03~0.08
21 S30480 06Cr18Ni9Cu2 0Cr18Ni9Cu2 0.08 1.00 2.00 0.045 0.030 8.00~10.50 17.00~19.00 — 1.00~3.00 — —
Table 2 Austenitic-ferritic type stainless steel designation and its chemical constitution
Serial
number
Unified
numerical
name
New designation Old designation
Chemical constitution (mass fraction)/%
C Si Mn P S Ni Cr Mo Cu N Other elements
67 S21860 14Cr18Ni11Si4AlTi 1Cr18Ni11Si4AlTi 0.10~0.18 3.10~1.00 0.80 0.035 0.030 10.00~12.00 17.50~19.50 — — — Ti0.40~0.70Al0.10~0.30
68 S21953 022Cr19Ni5Mo3Si2N 00Cr18Ni5Mo3Si2 0.030 1.30~2.00 1.00~2.00 0.035 0.030 4.50~5.50 18.00~19.50 2.50~3.00 — 0.05~0.12 —
69 S22160 12Cr21Ni5Ti 1Cr21Ni5Ti 0.09~0.14 0.80 0.80 0.035 0.030 4.80~5.80 20.00~22.00 — — — Ti5 (C—0.02) ~0.80
70 S22253 022Cr22Ni5Mo3N 0.030 1.00 2.00 0.030 0.020 4.50~6.50 21.00~23.00 2.50~3.50 — 0.08~0.20 —
71 S22053 022Cr—23Ni5Mo3N 0.030 1.00 2.00 0.030 0.020 4.50~6.50 22.00~23.00 3.00~3.50 — 0.14~0.20 —
72 S23043 022Cr23Ni4MoCuN 0.030 1.00 2.50 0.035 0.030 3.00~5.50 21.50~21.50 0.05~0.60 0.05~0.60 0.05~0.20 —
73 S22553 022Cr25Ni6Mo2N 0.030 1.00 2.00 0.030 0.030 3.50~6.50 24.00~26.00 1.20~2.50 — 0.10~0.20 —
74 S22583 022Cr25Ni7Mo3WCuN 0.030 1.00 0.75 0.030 0.030 5.50~7.50 24.00~26.00 2.50~3.50 0.20~0.80 0.10~0.30 W0.10~0.50
75 S25554 03Cr25Ni6Mo3Cu2N 0.04 1.00 1.50 0.035 0.030 4.50~6.50 24.00~27.00 2.90~3.90 1.50~2.50 0.10~0.25 —
76 S25073 022Cr25Ni7Mo4N 0.030 0.80 1.20 0.035 0.020 6.00~8.00 24.00~26.00 3.00~5.00 0.50 0.24~0.32 —
77 S27603 022Cr25Ni7Mo4WCuN 0.030 1.00 1.00 0.030 0.010 6.00~8.00 24.00~26.00 3.00~4.00 0.50~1.00 0.20~0.30 W0.50~1.00Cr+3.3Mo+16N
Table 4 Martensitie grade stainless steel, heat resisting steel designation and its chemical composition
Serial
numbe
Unified
numeric
al name
New designation Old designation
Chemical constitution (mass fraction)/%
C Si Mn P S Ni Cr Mo Cu N Other elements
96 S40310 12Cr12a 1Cr12a 0.15 0.50 1.00 0.040 0.030 (0.60) 11.50~13.00 — — — —
97 S41008 06Cr13 0Cr13 0.08 1.00 1.00 0.040 0.030 (0.60) 11.50~13.50 — — — —
98 S41010 12Cr13a 1Cr13a 0.13 1.00 1.00 0.040 0.030 (0.60) 11.50~13.50 — — —...
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