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GB/T 9450-2025: Determination of the case hardening depth for steel
Status: Valid GB/T 9450: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9450-2025 | English | 279 |
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Determination of the case hardening depth for steel
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GB/T 9450-2025
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| GB/T 9450-2005 | English | 85 |
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Steels -- Determination and verification of the depth of carburized and hardened cases
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GB/T 9450-2005
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| GB/T 9450-1988 | English | 199 |
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Determination and verification of the effective depth of carburized and hardened cases of steel parts
| Obsolete |
GB/T 9450-1988
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Basic data | Standard ID | GB/T 9450-2025 (GB/T9450-2025) | | Description (Translated English) | Determination of the case hardening depth for steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J36 | | Classification of International Standard | 25.200 | | Word Count Estimation | 14,171 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 9450-2005 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 9450-2025: Determination of the case hardening depth for steel---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT9450-2025
ICS 25.200
CCSJ36
National Standard of the People's Republic of China
Replaces GB/T 9450-2005
Determination of depth of carburized and quenched hardened layer on steel parts
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols and abbreviations 1
5 Principle 2
6 Test Equipment 2
7 Sample 2
8 Determination Method 3
9 Result evaluation 4
10 Test Report 4
Appendix A (Normative) Determination of carburized quenching hardened layer depth by interpolation method 6
References 7
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 9450-2005 "Determination and verification of the depth of the hardened layer of steel parts by carburizing and quenching" and is consistent with GB/T 9450-2005.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2005 edition);
b) The provisions on measurement items have been changed (see Chapter 4, Chapter 4 of the.2005 edition);
c) The general provisions for determination of hardened case depth have been deleted, and the determination principle has been changed (see Chapter 5, 5.1 and 5.2 of the.2005 edition);
d) Added requirements for test equipment (see Chapter 6);
e) The requirements for test specimens have been changed (see Chapter 7, 5.3.1 and 5.3.2 of the.2005 edition);
f) The determination method has been changed (see Chapter 8, 5.3.3 of the.2005 edition);
g) The provisions for result evaluation have been changed (see Chapter 9, 5.4 of the.2005 edition);
h) The contents of the test report have been changed (see Chapter 10, Chapter 7 of the.2005 edition);
i) The chapter “Verification” has been deleted (see Chapter 6 of the.2005 edition);
j) Added the interpolation method for carburizing and quenching hardened layer depth (see Appendix A).
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 is proposed and coordinated by the National Technical Committee for Standardization of Heat Treatment (SAC/TC75).
This document was drafted by. Beijing Electromechanical Research Institute Co., Ltd. of China Machinery Engineering Corporation, Jiangsu Fengdong Heat Treatment and Surface Modification Engineering Technology Co., Ltd.
Technology Research Co., Ltd., Zhejiang Shuanghuan Transmission Machinery Co., Ltd., Chongqing Gearbox Co., Ltd., Dalian Huarui Heavy Industry Group Co., Ltd.
Co., Ltd., Beijing Petroleum Machinery Co., Ltd., Taiyuan Heavy Industry Rail Transportation Equipment Co., Ltd., Jiangsu Golden Industrial Furnace Co., Ltd., Shanghai
Hai Rail Transit Inspection and Certification (Group) Co., Ltd., Zhejiang National Inspection and Testing Technology Co., Ltd., Guangzhou Fengdong Heat Refining Co., Ltd., Zhejiang
Juyue Gear Co., Ltd., Gosberg Thermal Systems Jiangsu Co., Ltd., Zhejiang Qiujing Technology Co., Ltd., Hangzhou Qianjin Gearbox Group Co., Ltd.
Co., Ltd., Suzhou Thermal Engineering Research Institute Co., Ltd., Guilin Fuda Co., Ltd., Changshu Tiandi Coal Machinery Equipment Co., Ltd., Qingdao Yidong Coal
Mining Machinery Manufacturing Co., Ltd., Hunan Southern Aerospace High Precision Transmission Co., Ltd., Chongqing Jingyanxinjukui Technology Co., Ltd., Shenyang Jiayu Vacuum
Technology Co., Ltd., Shanghai United Rolling Bearing Co., Ltd., Jinan Heavy Industry Group Co., Ltd., Nanjing Technology Equipment Manufacturing Co., Ltd.,
Nanjing Chuangli Transmission Machinery Co., Ltd., Jiangsu Shendun Engineering Machinery Co., Ltd., Jianhu Jintuo Machinery Manufacturing Co., Ltd., Changzhou New District Hehai
HEAT TREATMENT ENGINEERING LIMITED.
The main drafters of this document are. Xu Yueming, Li Qiao, Shi Yousen, Zhang Zhao, Hu Zhaonan, Cao Fengjiao, Li Ruxue, Zhao Xinglong, Chen Weidong, Liu Guoyong,
Wang Hui, Xia Xiaoyu, Shi Tianzhen, Zou Zhaohui, Xia Mingdao, Zhou Huanhui, Lai Yunting, Li Bin, Yuan Yuedong, Leng Gang, Qi Ling, Chen Andong, Wang Jiajie,
Fan Linhua, Xu Jingwei, Liu Hongyan, Liu Wei, Xu Changfei, Yang Jian, Yin Heping, Han Yongzhen, Wang Qin, Wei Xiaolin, Peng Tian, Chen Decai, Xu Wentian,
Ma Shitao and Ling Dehua.
This document was first issued in 1988, revised for the first time in.2005, and this is the second revision.
Determination of depth of carburized and quenched hardened layer on steel parts
1 Scope
This document specifies the principles, test equipment, test specimens, determination methods, result evaluation and
Test report.
This document is applicable to workpieces after carburizing or carbonitriding and quenching and tempering heat treatment.
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 4340.1 Metallic materials Vickers hardness test Part 1.Test method
GB/T 4340.2 Metallic materials Vickers hardness test Part 2.Verification and calibration of hardness testers
GB/T 7232 Terminology for Metal Heat Treatment
GB/T 18449.1 Knoop hardness test for metallic materials Part 1.Test method
GB/T 18449.2 Knoop hardness test for metallic materials - Part 2.Verification and calibration of hardness testers
3 Terms and Definitions
The terms and definitions defined in GB/T 7232 and the following apply to this document.
3.1
Carburizing quenching hardening layer depth casehardeningdepth; CHD
The vertical distance from the workpiece surface to the limit hardness of 550HV Vickers hardness value (or equivalent Knoop hardness value).
Note. Usually the hardened case depth is measured after carburizing or carbonitriding and quenching. If it is measured after quenching and tempering, it needs to be noted in the report.
4 Symbols and abbreviations
The symbols and abbreviations given in Table 1 apply to this document.
Table 1 Symbols and abbreviations
Symbols and abbreviations Unit meaning
di mm Distance from the workpiece surface to the center of each hardness indentation
Δd mm. distance between the centers of two adjacent hardness indentations
CHD mm Carburizing and quenching hardening depth (casehardening depth)
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