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GB/T 5617-2025: Determination of surface hardening depth for steel
Status: Valid GB/T 5617: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 5617-2025 | English | 279 |
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Determination of surface hardening depth for steel
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GB/T 5617-2025
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| GB/T 5617-2005 | English | 125 |
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Determination of effective depth of hardening after induction or flame hardening of steel
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GB/T 5617-2005
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| GB/T 5617-1985 | English | 199 |
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Determination of effective depth of hardening after induction or flame hardening of steel
| Obsolete |
GB/T 5617-1985
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Basic data | Standard ID | GB/T 5617-2025 (GB/T5617-2025) | | Description (Translated English) | Determination of surface hardening depth for steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J36 | | Classification of International Standard | 25.200 | | Word Count Estimation | 14,191 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 5617-2005 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 5617-2025: Determination of surface 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/GBT5617-2025
ICS 25.200
CCSJ36
National Standard of the People's Republic of China
Replaces GB/T 5617-2005
Determination of depth of quenching hardened layer on steel surface
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 5
Appendix A (Normative) Determination of surface 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 5617-2005 "Determination of effective hardened case depth of steel after induction hardening or flame hardening" and is in line with GB/T 5617-
Compared with.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 terms and definitions have been changed (see Chapter 3, Chapter 3 of the.2005 edition);
c) The provisions on measurement items have been changed (see Chapter 4, Chapter 4 of the.2005 edition);
d) The determination principle has been changed (see Chapter 5, 5.1 of the.2005 edition);
e) Added requirements for test equipment and test specimens (see Chapters 6 and 7);
f) The determination method has been changed (see Chapter 8, 5.2 of the.2005 edition);
g) The provisions for result evaluation have been changed (see Chapter 9, 5.3 of the.2005 edition);
h) "Verification" has been deleted (see Chapter 6 of the.2005 edition);
i) The content of the test report has been changed (see Chapter 10, Chapter 7 of the.2005 edition);
j) Added the interpolation method for determining the depth of surface quenching hardened layer (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 Academy Group, Zhejiang Shuanghuan Transmission Machinery Co., Ltd.,
AVIC Great Wall Metrology and Testing (Tianjin) Co., Ltd., Chongqing Gearbox Co., Ltd., Dalian Huarui Heavy Industries Group Co., Ltd., CRRC
Industrial Research Institute (Qingdao) Co., Ltd., Jiangsu Golden Industrial Furnace Co., Ltd., Shanghai Rail Transit Inspection and Certification (Group) Co., Ltd.,
Guangzhou Fengdong Heat Refining Co., Ltd., Tianrun Industrial Technology Co., Ltd., Zhejiang Juyue Gear Co., Ltd., Ma'anshan Fangyuan Precision Machinery Co., Ltd.
Co., Ltd., Jiangsu Yingliu Machinery Manufacturing Co., Ltd., Ningbo Zongda Electric Spring Co., Ltd., Suzhou Thermal Engineering Research Institute Co., Ltd., Hubei
Tianshu Induction Technology Co., Ltd., Guilin Fuda Co., Ltd., Hunan Southern Aerospace High Precision Transmission Co., Ltd., Jinan Heavy Industry Group
Co., Ltd., Dongfeng Dana Axle Co., Ltd., Hebei Xintai Bearing Forging Co., Ltd., Dongying Kenli Borui Petroleum Machinery Co., Ltd.,
Beijing Huaxiang Electric Furnace Technology Co., Ltd., Jiangsu Shendun Engineering Machinery Co., Ltd., Changzhou New District Hehai Heat Treatment Engineering Co., Ltd.,
Shanghai Jinyi Testing Technology Co., Ltd. and Shandong Baichang Auto Parts Co., Ltd.
The main drafters of this document are. Xu Yueming, Li Qiao, Li Bingji, Lü Guoyi, Huang Wenpeng, Cao Fengjiao, Wang Cong, Chen Weidong, Ren Songzan, Xia Xiaoyu,
Sun Jun, Shi Tianzhen, Yang Shaolong, Gao Changyou, Huang Jiangfeng, Lai Yunting, Min Yuzheng, Li Feng, Qi Ling, Qiu Jian, Zhan Jiayong, Hu Jiyong, Liu Zhizhen,
Du Limin, Wang Fusong, Yin Heping, He Qiang, Jing Changwen, Meng Jiahong, Liu Guoyong, Wei Xiaolin, Xia Lijun, Hu Chuang, Li Bin, Zhu Yongming, and Zhang Tian.
This document was first issued in 1988, revised for the first time in.2005, and this is the second revision.
Determination of depth of quenching hardened layer on steel surface
1 Scope
This document specifies the determination principle, test equipment, specimens, test methods and procedures for the depth of surface quenching hardened layer and the total depth of surface quenching hardened layer of steel parts.
Determine the method, evaluate the results and report the test.
This document is applicable to parts that are surface hardened by induction hardening, flame hardening, laser hardening, electron beam hardening, etc.
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
The vertical distance from the workpiece surface to the specified limit hardness.
Note. Limit hardness = A × minimum surface hardness (HV) required by the technology, usually A = 0.8.
3.2
The distance from the workpiece surface to the boundary with the substrate having the same hardness.
Note. The total hardened layer depth of surface quenching is determined by hardness method or metallographic method, and metallographic method is commonly used.
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 indentations
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