Steels containing certain alloys, such as manganese, nickel, in austenite at room temperature, cannot be hardened by normal heat treatment, but do a high percentage of hardening elements. They are also non-magnetic. Typical examples of austenitic steels include 18/8 stainless steel and 14% manganese steel. The formula is used to calculate the temperature Md30 at which 50% of the austenite will be converted to martensite, and the cold 0.30 should be deformed. The formula can be given as:

M_d30=551 - 462 * %C - 9.2 * %Si - 8.1 * %Mn - 13.7 * %Cr - 29 * %Ni - 18.5 * %Mo - 29 * %Cu - 68 * %Nb - 462 * %N - 1.42 * (GS[ASTM] -8.0)

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