GB/T 9450-1988: Determination and verification of the effective depth of carburized and hardened cases of steel parts

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Scope

This standard specifies the meaning and determination method of the effective hardened
depth of carburized and carbonitrided cases of steel parts.
This standard applies to.
a. parts with an effective case-hardened depth (DC) greater than 0.3 mm from
carburizing and carbonitriding.
b. parts, when it is heat-treated to the final hardness value, whose hardness is less
than 450 HV at a distance of three times the effective case-hardened depth
from the surface.
For steel parts that do not meet the above conditions, the effective case-hardened depth
shall be determined by agreement among the relevant parties. For parts with a hardness
greater than 450 HV at a distance of three times the effective case-hardened depth from
the surface, a limiting hardness value larger than 550 HV (with 25 HV as an increment)
may be used to determine the effective case-hardened depth.

Basic Data

Standard ID	GB/T 9450-1988 (GB/T9450-1988)
Description (Translated English)	Determination and verification of the effective depth of carburized and hardened cases of steel parts
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J36
Word Count Estimation	5,531
Date of Issue	6/25/1988
Date of Implementation	3/1/1989
Adopted Standard	ISO 2639-82 (E), MOD
Regulation (derived from)	Announcement of Newly Approved National Standards 2005 No. 10 (No. 84 overall)