1 Scope
This International Standard defines the case-hardened depth, and specifies methods
for the determination of this depth, in steel.
It is applicable to
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a) carburized cases and carbonitrided cases;
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b) parts that, when heat treated to final hardness, have a hardness of less than 450 HV 1 at a distance of three times the case-hardened depth, from the surface.
The case-hardened depth is defined by special agreement where these conditions are
not met.
For steels that, in the part under test, and at a distance of three times the case-hardened
depth from the surface, present a hardness greater than 450 HV 1, the criterion can
still be used, provided that a limiting hardness value greater than 550 HV 1 – in
steps of 25 units – be selected for the case-hardened depth.