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QC/T 502-2025 English PDF

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QC/T 502-2025: Metallographic examination for steel automobile parts by induction hardened
Status: Valid

QC/T 502: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
QC/T 502-2025	English	219	Add to Cart	3 days [Need to translate]	Metallographic examination for steel automobile parts by induction hardened	Valid	QC/T 502-2025
QC/T 502-1999	English	419	Add to Cart	3 days [Need to translate]	(Auto parts induction hardening metallurgical test)		QC/T 502-1999

Basic data

Standard ID	QC/T 502-2025 (QC/T502-2025)
Description (Translated English)	Metallographic examination for steel automobile parts by induction hardened
Sector / Industry	Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard	T30
Classification of International Standard	43.040
Word Count Estimation	10,113
Date of Issue	2025-05-09
Date of Implementation	2025-11-01
Older Standard (superseded by this standard)	QC/T 502-1999
Issuing agency(ies)	Ministry of Industry and Information Technology of the People's Republic of China

QC/T 502-2025: Metallographic examination for steel automobile parts by induction hardened

---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/QCT502-2025
Automobile Industry Standards of the People's Republic of China Replaces QC/T 502-1999 2025-05-09 Release 2025-11-01 Implementation CCS T 30 ICS 43.040 Ministry of Industry and Information Technology of the People's Republic of China issued Metallographic inspection of induction hardened steel automotive parts Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Sample preparation 1 5 Measurement of hardened layer depth 2 6 Inspection and evaluation of the metallographic structure of the hardened layer 4

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 502-1999 Metallographic Examination of Automotive Induction Hardened Parts. In addition to the integration and editorial changes, the main technical changes are as follows. a) Added the sample preparation method (see 4.1); b) Sampling locations have been added (see 4.2); c) Added the hardness test method for measuring the depth of hardened layer (see 5.2); d) The metallographic photographs for measuring the depth of the hardened layer by the metallographic method have been changed (see Figure 4, Figures 11 and 12 of the.1999 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 and coordinated by the National Technical Committee for Standardization of Automotive Products (SAC/TC 114). This document was drafted by. Dongfeng Commercial Vehicle Co., Ltd., FAW Jiefang Automobile Co., Ltd., Luoyang Shenghua Induction Heating Co., Ltd., Shanghai Automotive Industry Corporation Limited, Dongfeng Peugeot Citroen Automobile Co., Ltd., and Pan Asia Technical Automotive Center Co., Ltd. The main drafters of this document are. Zhao Junping, Niu Enlai, Yan Jing, Wang Weixin, Guo Wenfang, Chu Hongmei, Sun Chao, Huang Zhi, Zhang Yifan, Liu Haitang, Xiong Biyun, Shi Tianyin. The previous versions of this document and the documents it replaces are as follows. --First published in.1999 as QC/T 502-1999; --This is the first revision. Metallographic inspection of induction hardened steel automotive parts 1 Scope This document specifies the preparation of specimens for induction hardening of steel automotive parts, the measurement of hardened layer depth, and the inspection and evaluation of metallographic structure. This document is applicable to the metallographic examination of parts made of medium carbon structural steel and medium carbon alloy structural steel after induction hardening and low temperature tempering. 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 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 following terms and definitions apply to this document. 3.1 Effective hardened layer depth effective hardened depth For induction hardened parts, in the quenched state or the low-temperature tempered state after quenching, the hardness value from the surface of the hardened layer of the part to the position of the specified limit hardness value is Vertical distance. 4.Sample preparation 4.1 Sampling The test specimen is usually cut directly from the part. It can also be cut in the shape, size, material and other materials that are consistent with the test part without affecting the result. The samples are cut from the same quality and heat treatment conditions. 4.2 Sampling Location 4.2.1 For parts with simple shapes, sample the part in the middle of the hardened zone, see Figure 1.If there are special requirements, please indicate them on the product documentation. \t\u001d\b

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