Historical
ISO 3754:1976
Steel - Determination of effective depth of hardening after flame or induction hardening
Defines the effective depth of hardening and specifies a measuring method. Applies to hardened layers with a depth greater than 0,3 mm, and parts which have at a distance 3 x depth of hardening from the surface a hardness less than hardness limit - 100.
International Organization for Standardization [iso]