Stainless steel sheet and stainless steel band of dual phase structure and production method of stainless steel sheet and stainless steel band

摘要

A stainless steel plate and a stainless steel strip of dual phase structure, characterized by containing, in% by mass, C: 0.02 to 0.20%, Si: 0.10 to 1.0%, Mn: 0.20 to 2.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.0 to 18.0%, Ni: 0.5 to 2.5%, Sn: 0.05 at 0.30% and N: 0.010 to 0.10%, which optionally also contain one or more of B: 0.0003 to 0.0050%, Cu: 0.30 to 2.0%, Mo: 0, 30 to 2.0% and Al: 0.01 to 0.1%, which have a γp, indicated by the following formula (a), in the range of 60 to 95, which have a Fe residue and unavoidable impurities, which have a dual phase structure of ferrite and martensite, and which have a Vicker hardness of 200HV or more: γp = 420C + 470N + 23Ni + 7Mn + 9Cu-11.5Cr-11.5Si-12Mo-7Sn-49Ti-47Nb -52Al + 189 (a)