Patent ID: 8906171

Claim:
A method of producing a TWIP and nano twinned austenitic stainless steel, comprising the steps of: providing an austenitic stainless steel that contains not more than 0.018 wt % C, 0.25-0.75 wt % Si, 1.5-2 wt % Mn, 17.80-19.60 wt % Cr, 24.00-25.25 wt % Ni, 3.75-4.85 wt % Mo, 1.26-2.78 wt % Cu, 0.04-0.15 wt % N, and the balance of Fe and unavoidable impurities; bringing the austenitic stainless steel to a temperature below 0° C.; and imparting plastic deformation to the austenitic steel at that temperature to an extent that corresponds to a plastic deformation of at least 30% such that nano twins are formed in the material.