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GB/T 11354-2025: Determination of nitriding hardness depth and metallographic examination for steel
Status: Valid GB/T 11354: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 11354-2025 | English | 439 |
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Determination of nitriding hardness depth and metallographic examination for steel
| Valid |
GB/T 11354-2025
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| GB/T 11354-2005 | English | 165 |
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Determination of nitrided case depth and metallographic microstructure examination for steel and iron parts
| Valid |
GB/T 11354-2005
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| GB/T 11354-1989 | English | 599 |
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Steel-iron parts--Determination of nitrided case depth and metallographic examination of nitriding structure
| Obsolete |
GB/T 11354-1989
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Basic data | Standard ID | GB/T 11354-2025 (GB/T11354-2025) | | Description (Translated English) | Determination of nitriding hardness depth and metallographic examination for steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J36 | | Classification of International Standard | 25.200 | | Word Count Estimation | 22,290 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 11354-2005 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 11354-2025: Determination of nitriding hardness depth and metallographic examination 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/GBT11354-2025
ICS 25.200
CCSJ36
National Standard of the People's Republic of China
Replaces GB/T 11354-2005
Determination of nitriding layer depth and metallographic structure inspection of 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 2
5 Determination of nitriding layer depth 2
6 Metallographic inspection of nitrided layer 5
7 Test Report 13
Appendix A (Normative) Determination of Nitriding Hardened Layer Depth by Interpolation Method 14
Reference 15
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 11354-2005 "Determination of nitriding layer depth and metallographic examination of steel parts" and GB/T 11354-
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) Added the terms and definitions of “nitriding hardened layer depth” and “compound layer thickness” (see 3.1 and 3.2);
c) Added symbols and abbreviations (see Chapter 4);
d) Added the determination principle of hardened layer depth and the provisions of test equipment (see 5.1.1 and 5.1.2);
e) The provisions on specimens, test methods and results have been modified (see 5.1.3, 5.1.4, 5.1.5, Chapter 5 and 6.1 of the.2005 edition);
f) Deleted the provisions on measurement steps and results, metallographic method and arbitration (see 6.2, 6.3 and 6.4 of the.2005 edition);
g) Added the method for determining the thickness of the compound layer (see 5.2);
h) The original description of tissue levels was changed, and "fine needle-shaped trochophores" were deleted [see Figures 6a) to 6e, Table 1 of the.2005 edition];
i) Deleted the important parts in the metallographic inspection regarding the original structure, nitriding layer brittleness, nitriding layer looseness, and nitride grade assessment
(See 4.2, 7.4, 8.2, and 9.2 of the.2005 edition);
j) The requirement to repeat the measurement of nitrided layer brittleness once has been deleted (see 7.3 of the.2005 edition);
k) The content of the test report has been changed (see Chapter 7, Chapter 10 of the.2005 edition);
l) Added the interpolation method for determining the depth of nitriding 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.,
China University of Petroleum (East China), Zhejiang National Inspection Technology Co., Ltd., Dalian Huarui Heavy Industries Group Co., Ltd., Chongqing Gearbox
Co., Ltd., Jiangsu Fengdong Heat Treatment and Surface Modification Engineering Technology Research Co., Ltd., Beijing Petroleum Machinery Co., Ltd., Jiangsu Golden
Industrial Furnace Co., Ltd., Qingdao Fengdong Thermal Technology Co., Ltd., Zhejiang Juyue Gear Co., Ltd., Tianrun Industrial Technology Co., Ltd.
Co., Ltd., Gosbell Thermal Systems Jiangsu Co., Ltd., Zhejiang Qiujing Technology Co., Ltd., Suzhou Thermal Engineering Research Institute Co., Ltd., Hangzhou Qianjin Gearbox
Group Co., Ltd., Chengdu Saifeisi Metal Technology Co., Ltd., Hunan Southern Aerospace High Precision Transmission Co., Ltd., Shanghai Zhongyan Instrument Manufacturing Co., Ltd.
Manufacturing Co., Ltd., Shandong Bote Bearing Co., Ltd., Chongqing Jingyan Xinjukui Technology Co., Ltd., Kunshan Sanmin Tulai Surface Treatment Technology Co., Ltd.
Company, Nanjing Technology Equipment Manufacturing Co., Ltd., Rugao Hongmao Heavy Forging Co., Ltd., Jiangsu Shendun Engineering Machinery Co., Ltd.,
Yeshan Heavy Industry Equipment Co., Ltd., Changzhou New District Hehai Heat Treatment Engineering Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd.
Limited Company.
The main drafters of this document are. Xu Yueming, Li Qiao, Zhou Zhiqiang, Li Meiyan, Wang Hui, Cao Fengjiao, Zhao Yun, Shi Yousen, Wang Ruixiao, Chen Weidong,
Li Dan, Shi Tianzhen, Sun Jun, Zou Zhaohui, Wang Changfei, Lai Yunting, Zhou Huanhui, Zhou Weining, Qi Ling, Wei Hebao, Zhang Shuyu, Chen Andong, Wang Jiancai,
Ding Xiang, Zhou Qingchun, Zhang Honglin, Peng Yuanfei, Yin Heping, Li Pingping, Zhang Tian, Cao Ning, Zhang Ling, Ma Mingliang, and Qin Lixue.
This document was first issued in 1988, revised for the first time in.2005, and this is the second revision.
Determination of nitriding layer depth and metallographic structure inspection of steel parts
1 Scope
This document specifies the method for determining the depth of nitriding and nitrocarburizing layers on steel parts and the method for examining the metallographic structure before and after nitriding.
This document is applicable to the measurement of nitriding hardening layer depth and compound layer thickness after gas nitriding, ion nitriding and nitrocarburizing of steel parts.
Determination, as well as inspection and evaluation of brittleness, porosity, vein nitrides and microstructure before nitriding.
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
GB/T 34895 General rules for metallographic examination of heat treatment
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 surface of the nitrided layer to the point where the hardness is 50HV higher than the core.
Note. The core hardness is the arithmetic mean of 5 or more measured values at 3 times the depth of the hardened layer, rounded off to an integer multiple of 10HV.
3.2
The thickness of the surface compound layer formed by the infiltrating elements and the metal elements in the matrix during chemical heat treatment.
3.3
Microstructure of steel before nitriding treatment.
3.4
The degree of chipping of the corners of the Vickers hardness indentation on the surface of the nitrided part under a certain test force.
3.5
The density of micropores in the compound layer on the surface of nitrided parts.
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