This standard prescribes the following four methods of measuring case depth ( CD ) of steel hardened by carburizing, nitriding, carbonitriding, cyaniding or induction and flame hardening ( applicable methods are indicated in Table 1 ):
a) Hardness method,
b) Chemical method,
c) Macro-structure method, and
d) Microscopic method.
IS 6416-1971 history
1972IS 6416-1971 How to measure the depth of steel surfaces