BA-FINISHED MATERIAL OF FERRITIC STAINLESS STEEL SUPERIOR IN FINGERPRINT RESISTANCE, SCRATCH RESISTANCE AND WORKABILITY, AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a stainless steel sheet superior in fingerprint resistance and scratch resistance while keeping adequate workability. SOLUTION: The stainless steel sheet has a soft ferritic phase in the central part in a sheet thickness direction and a hard martensitic phase in the surface layer region; is tempered into the hardness of 250 HV or higher on the surface, and of 250 HV or lower in the central part in the sheet thickness direction; and has a passivated film containing 0.25 or higher Si by a mass ratio with respect to Cr and Mn, formed on the surface of the steel sheet. The hard martensitic phase is formed by the transformation of an austenitic phase produced by a nitrogen absorption reaction during BA annealing. COPYRIGHT: (C)2006,JPO&NCIPI