This standard specifies the definition and determination method of the total or effective thickness of thin surface hardened layers of steel parts.
This standard is applicable to steel parts with total or effective thickness of surface hardened layer of less than 0.3mm.
This standard is not applicable to parts with no transition layer between the hardened layer and base metal.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrigendum), or revisions of, any of these publications do not apply. However, all parties coming to an agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 4340.1-1999 Metallic Materials -Vickers Hardness Test - Part 1: Test Method
GB/T 7232-1999 Terminology of Metal Heat Treatment
GB/T 9450-2005 Steels - Determination and Verification of the Depth of Carburized and Hardened Cases (ISO 2639: 2002, MOD)
GB/T l8449.1-2001 Metallic Knoop Hardness Test - Part 1: Test Method
