GB/T 9450-2005: Steels -- Determination and verification of the depth of carburized and hardened cases

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Scope

This standard specifies the meaning and determination of steel-parts
carburizing and carbonitriding hardened-case depth.
This standard is applicable to carburizing and carbonitriding hardened layer;
and the parts that, when they are final-heat-treated, have a hardness of less
than 450 HV at a distance of three times the case-hardened depth, from the
surface.
For steel-parts that can not meet the above conditions, it shall be determined
in accordance with a special agreement.
For steel-parts of which, at a distance of three times the hardened-case depth
from the surface, the hardness is greater than 450 HV, this standard is still
valid, provided that a limiting hardness value that is greater than 550 HV (in
steps of 25HV) – is selected for the case-hardened depth.

Basic Data

Standard ID	GB/T 9450-2005 (GB/T9450-2005)
Description (Translated English)	Steels - Determination and verification of the depth of carburized and hardened cases
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J36
Classification of International Standard	25.200
Word Count Estimation	6,643
Date of Issue	2005-07-21
Date of Implementation	2006-01-01
Older Standard (superseded by this standard)	GB/T 9450-1988
Quoted Standard	GB/T 4340.1; GB/T 18449.1
Adopted Standard	ISO 2639-2002; MOD
Regulation (derived from)	Announcement of Newly Approved National Standards No. 10 of 2005 (No. 84 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee
Summary	This standard specifies: steel carburizing and carbonitriding parts hardened layer depth meaning and determination. This standard applies to: carburizing and carbonitriding hardened layer, and after the final heat treatment, 3 times from the surface at a depth of hardened layer hardness values ??less than 450HV-parts.