Patent ID: 7341690
Filing Date: 2008-03-11
Classification: C21D,C22C

Abstract:
1. A soft Cr-containing steel having a composition, on a % by mass basis, comprising: C: from about 0.001% to about 0.020%; Si: more than about 0.10% and less than about 0.50%; Mn: less than about 2.00%; P: less than about 0.060%; S: less than about 0.008%; Cr: from about 12.0% or more to about 16.0%; Ni: from about 0.05% to about 1.00%; N: less than about 0.020%; Nb: from about 0.30% to less than 1.00%; Mo: more than about 0.80% and less than about 3.00%; W: from more than about 2.00% to about 5.00%; and Fe and incidental impurities, wherein the contents of alloying elements, silicon and molybdenum, represented by Si and Mo, respectively, on a % by mass basis, satisfy the following formula (1):