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

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Scope

This Document specifies the test methods for the metallographic structure, effective hardening
depth, and case and core hardness of steel automobile carbonitriding gears.
This Document applies to the quality inspection of automobile carbonitriding gears with an
effective hardening depth greater than 0.3 mm after all heat treatment procedures.

Basic Data

Standard ID	QC/T 29018-2025 (QC/T29018-2025)
Description (Translated English)	Metallographic examination for automobile carbonitriding gears
Sector / Industry	Automobile and 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Older Standard (superseded by this standard)	QC/T 29018-1991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