Patent ID: 6893727

Claim:
A stainless steel for a metal gasket having a chemical composition consisting essentially of, in mass %, C: at most 0.03%, Si: at most 1.0% Mn: at most 2.0%, Cr: at least 16.0% and at most 18.0%, Ni: at least 6.0% and at most 8.0%, N: at most 0.25%, Nb: 0-0.30%, and a remainder of Fe and unavoidable impurities, and having a duplex phase structure of martensite with an area ratio of at least 40% and a remainder of austenite, or a single phase structure of martensite, and which can be used to manufacture a metal gasket having Hv of at least 500 and having chromium nitride precipitated in the martensite phase by again after forming.