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QC/T 29018-2025 English PDF

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QC/T 29018-2025: Metallographic examination for automobile carbonitriding gears
Status: Valid

QC/T 29018: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
QC/T 29018-2025	English	359	Add to Cart	4 days [Need to translate]	Metallographic examination for automobile carbonitriding gears	Valid	QC/T 29018-2025
QC/T 29018-1991	English	419	Add to Cart	3 days [Need to translate]	Metallographic test for carbonitriding gear of automobile		QC/T 29018-1991

Basic data

Standard ID	QC/T 29018-2025 (QC/T29018-2025)
Description (Translated English)	Metallographic examination for automobile carbonitriding gears
Sector / Industry	Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard	T30
Classification of International Standard	43.040
Word Count Estimation	18,166
Date of Issue	2025-05-09
Date of Implementation	2025-11-01
Older Standard (superseded by this standard)	QC/T 29018-1991
Issuing agency(ies)	Ministry of Industry and Information Technology of the People's Republic of China

QC/T 29018-2025: Metallographic examination for automobile carbonitriding gears

---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/QCT29018-2025
ICS 43.040CCS T 30 Automobile Industry Standards of the People's Republic of China Released on May 9, 2025 2025-11-01Implementation Metallographic inspection of automotive carbonitriding gears Ministry of Industry and Information Technology of the People's Republic of China issued Replaces QC/T 29018-1991 Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Sample requirements 1 5 Inspection items and inspection methods 2 6 Metallographic structure level assessment and technical requirements 3 7 Inspection instruments 5 8 Inspection Report 5 Appendix A (Normative) Martensite Grade Figure 6 Appendix B (Normative) Retained Austenite Level Figure 7 Appendix C (Normative) Carbide Grades of Network and Granular Distribution Figure 8 Appendix D (Normative) Heart Organization Levels Figure 10 Appendix E (Normative) Non-martensitic layer types 11

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 QC/T 29018-1991 Metallographic Examination of Automotive Carbonitriding Gears. In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The definition of effective hardened case depth has been changed (see 3.3 of the.1991 edition); b) Added terms and definitions for non-martensitic structures (see 3.4); c) Added requirements for test items and test methods (see Chapter 5); d) The description of martensite evaluation has been changed (see Table 2 of the.1991 edition); e) The description of retained austenite assessment has been changed (see Table 3, Table 2 of the.1991 edition); f) The description of carbon and nitrogen compound assessment has been changed (see Table 4, Table 1 of the.1991 edition); g) Added assessment of heart tissue (see 6.5); h) Added non-martensitic layer assessment (see 6.6); i) Added requirements for test instruments (see Chapter 7); j) Added the requirements for inspection reports (see Chapter 8); k) The original metallographic structure evaluation map was changed to the evaluation map under 500x field of view (see Appendix A to Appendix C,.1991 edition of the group weaving assessment atlas); l) Added a cardiac tissue grade assessment chart (see Appendix D); m) Added diagram of non-martensitic layer types (see Appendix E). 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 and coordinated by the National Technical Committee for Standardization of Automotive Products (SAC/TC 114). This document was drafted by. Dongfeng Peugeot Citroen Automobile Co., Ltd., Dongfeng Commercial Vehicle Co., Ltd., SAIC Motor Corporation Limited, and Great Wall Motors Co., Ltd., Pan Asia Technical Automotive Center Co., Ltd. The main drafters of this document are. Liu Haitang, Wang Benman, Xiong Biyun, Yang Yuehua, Chu Hongmei, Zhao Junping, Fu Xingxing, Wang Weixin, Zhang Yifan, Wang Zhimiao, Wu Shaohua, Yuan Feng, and Zhou Xiaozhen. The previous versions of this document and the documents it replaces are as follows. --First published in 1979 as JB 2782-1979; --First revised in.1991 as QC/T 29018-1991; --This is the second revision. Metallographic inspection of automotive carbonitriding gears 1 Scope This document specifies the testing of metallographic structure, effective hardened layer depth, surface and core hardness of steel automotive carbonitriding gears. method. This document is applicable to automobile gears with effective hardened layer depth greater than 0.3 mm after carbonitriding quenching and all heat treatment processes are completed. Quality inspection. 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. document. GB/T 230.1 Rockwell hardness test for metallic materials Part 1.Test method GB/T 4340.1 Metallic materials Vickers hardness test Part 1.Test method GB/T 7232 Terminology for Metal Heat Treatment GB/T 9450 Determination and verification of the depth of carburized and quenched hardened layer on steel parts GB/T 13298 Metal microstructure examination methods 3 Terms and Definitions The terms and definitions defined in GB/T 7232 and the following apply to this document. 3.1 Case hardness The hardness of the surface near the pitch circle in the middle of the tooth width, or the hardness tested at a distance of 0.10 mm from the surface. 3.2 core hardness The hardness of the tooth at the intersection of the tooth centerline and the tooth root circle on the cross section in the middle of the tooth width. 3.3 Effective hardening depth The vertical distance from the tooth working surface to the specified hardness in its vertical direction. 3.4 non-martensite microstructure When the workpiece is heated, the oxygen generated in the medium diffuses inward along the grain boundaries of the workpiece surface, causing grain boundary oxidation of alloy elements, reducing hardenability, and quenching. The black tissue produced later. 4.Sample requirements 4.1 The test specimen should be cut from the cross section in the middle of the gear tooth width, including the entire area from the tooth top to the tooth root. The test surface of the tooth profile specimen should be

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