GB/T 17879-2023: Gear - Surface temper etch inspection after grinding, chemical method

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Scope

This document specifies procedures and requirements for the detection and classification of
localized overheating on ground surfaces by chemical etch methods.
The process described in this Document is typically used on ground surfaces; however, it is also
useful for the detection of surface anomalies that result from post-heat treatment machining
such as hard turning, milling and edge breaking (deburring) processes. Surface metallurgical
changes caused by carburization or decarburization are also readily detectable with this process.
Some methods which have been used in the past are no longer recommended. Specifications
are intended to be changed to use the methods in this Document. These etching methods are
more sensitive to changes in surface hardness than most hardness testing methods.
This Document applies to quenched steel parts such as gears, shafts, splines and bearings. It is
not applicable to nitrided parts and stainless steels.
NOTE. This process, although at times called “nital etch”, is not intended to be confused with other
processes also known as “nital etch”.
The surface temper etch procedure is performed after grinding and before final finishing
operations such as superfinishing, shot peening and honing.

Basic Data

Standard ID	GB/T 17879-2023 (GB/T17879-2023)
Description (Translated English)	Gear - Surface temper etch inspection after grinding, chemical method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J17
Classification of International Standard	21.200
Word Count Estimation	18,110
Date of Issue	2023-08-06
Date of Implementation	2023-08-06
Older Standard (superseded by this standard)	GB/T 17879-1999
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration