Patent ID: 9289964
Filing Date: 2016-03-22
CPC Classification: B32B,C21D,C22C,Y10T

Claim Text:
1. A high purity ferritic stainless steel sheet excellent in corrosion resistance and anti-glare property, which comprises a steel sheet which contains, by mass %, C: 0.001 to 0.03%, Si: 0.01 to 1%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 13 to 30%, N: 0.001 to 0.03%, Al: 0.005 to 1%, and Sn: 0.06 to 0.48%, and has a balance of Fe and unavoidable impurities, and which further comprises a surface film, said surface film containing, by ratio of only cations which make up said surface film other than C, O, and N, one or both of Al and Si in a total of 5 to 50 at %, and 1 to 10 at % Sn, and an average concentration of Cr in said surface film being, by ratio of only cations which make up said surface film other than C, O, and N, 1.1 to 3 times the concentration of Cr inside said steel sheet, and said surface film having a surface roughness of an arithmetic average roughness Ra of 0.3 to 1.2 μm.