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QC/T 262-2025 English PDF

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Q: Should I purchase the latest version QC/T 262-2025?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version QC/T 262-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
QC/T 262-2025: Metallographic examination for automobile carburized gears
Status: Valid

QC/T 262: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
QC/T 262-2025	359	Add to Cart	4 days	Metallographic examination for automobile carburized gears	Valid
QC/T 262-1999	170	Add to Cart	Auto, < 3 mins	Metallographic Test of Car Carburizing Gear

Basic data

Standard ID: QC/T 262-2025 (QC/T262-2025)
Description (Translated English): Metallographic examination for automobile carburized gears
Sector / Industry: Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard: T30
Classification of International Standard: 43.040
Word Count Estimation: 18,191
Date of Issue: 2025-04-10
Date of Implementation: 2025-11-01
Older Standard (superseded by this standard): QC/T 262-1999
Issuing agency(ies): Ministry of Industry and Information Technology of the People's Republic of China

QC/T 262-2025: Metallographic examination for automobile carburized 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/QCT262-2025
ICS 43.040CCS T 30 Automobile Industry Standards of the People's Republic of China Released on April 10, 2025 2025-11-01Implementation Metallographic inspection of carburized gears Ministry of Industry and Information Technology of the People's Republic of China issued Replaces QC/T 262-1999 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 4 8 Inspection Report 4 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) Surface Defect Morphology 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 262-1999 Metallographic Examination of Carburized Gears for Automobiles. Compared with QC/T 262-1999, except for the structural adjustment and In addition to editorial changes, the main technical changes are as follows. a) Added the definition of non-martensitic structure (see 3.4); b) Added test specimen requirements (see 4.1 and 4.2); c) Added requirements for inspection items and inspection methods (see Chapter 5); d) The description of martensite grade assessment has been changed (see Table 2, Table 2 of QC/T 262-1999); e) The description of retained austenite grade assessment has been changed (see Table 3, Table 2 of QC/T 262-1999); f) The carbide grade assessment instructions have been changed (see Table 4, Table 1 of QC/T 262-1999); g) Added assessment of heart tissue (see 6.5); h) Added the requirement for the depth of oxidation in the surface layer (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 atlas was changed to the evaluation atlas under 500x field of view (see Appendix A, Appendix B, Appendix C, Carbide grade chart of QC/T 262-1999); l) Added a cardiac tissue grade assessment chart (see Appendix D); m) Added a schematic diagram of the surface oxidation morphology (see Appendix E); n) Added a schematic diagram of non-martensitic microstructure morphology (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. SAIC Motor Corporation Limited, Dongfeng Commercial Vehicle Co., Ltd., SAIC Motor Transmission Co., Ltd., Dongfeng Peugeot Citroen Automobile Co., Ltd. and Pan Asia Technical Automotive Center Co., Ltd. The main drafters of this document are. Zhang Yifan, Ni Lei, Fan Liangwei, Wang Weixin, Zhao Junping, Yan Jing, Chu Hongmei, Zeng Xiaolei, Liu Haitang, Xiong Biyun, Yuan Feng and Zhou Xiaozhen. The previous versions of this document and the documents it replaces are as follows. --First issued in.1999 as QC/T 262-1999; --This is the first revision. Metallographic inspection of carburized gears 1 Scope This document specifies the inspection method for the metallographic structure of carburized, quenched and tempered automotive steel gears and the detection method for the effective hardened layer depth. This document is applicable to the quality of automobile gears with effective hardened layer depth greater than 0.3 mm after all heat treatment processes. test. 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 surface 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 center line and the root circle on the cross section in the middle of the tooth width. 3.3 Effective hardened layer depth effective hardened depth The vertical distance from the tooth working surface to the specified hardness in its vertical direction. 3.4 non-martensitic structure 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 the alloy elements, reducing the hardenability, and Black tissue produced after a fire. 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 On the normal section. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of QC/T 262-2025_English be delivered?

Answer: Upon your order, we will start to translate QC/T 262-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of QC/T 262-2025_English with my colleagues?

Answer: Yes. The purchased PDF of QC/T 262-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version QC/T 262-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version QC/T 262-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.