Patent ID: 6592685
Filing Date: 2003-07-15
Classification: C21D,C22C

Abstract:
Transformation controlled nitride precipitation hardening heat treatable steel, the steel having a composition comprising (in wt. %): 15-18 Cr, max. 0.5 Mn, 4-10 Ni, max. 15 Co, max. 4 W, max. 4 Mo, 0.5-1 V, at least one of Nb, Ta, Hf and Zr totaling between 0.001-0.1, 0.001-0.05 Ti, max. 0.5 Si, max. 0.05 C., 0.13-0.25 N, max. 4 Cu, rest iron and usual impurities, wherein a weight ratio of vanadium to nitrogen V/N is in the range between 3.5 and 4.2.