Age-hardening ferritic stainless steel sheet and age-treated steel using the same

摘要

PPROBLEM TO BE SOLVED: To provide a ferritic stainless steel sheet which has workability capable of providing high dimensional accuracy at press forming and can stably attain a strength level of 200 HV by aging treatment. PSOLUTION: The ferritic stainless steel sheet has a composition consisting of, by mass, 0.02% C, 1.0% Si, 1.0% Mn, 0.1% P, 0.02% S, 9 to 25% Cr, 0.5 to 3.0% Ni, 0.4 to 3.0% Al, 0.4 to 3.0% Cu, 0.1 to 1.0% Nb, 0.03% N and the balance substantially Fe and further containing, if necessary, either or both of 0.5% Ti and 2.0% Mo. Moreover, this ferritic stainless steel sheet has such a property that, when subjected to aging treatment consisting of holding in an atmosphere of 500 to 800C for 0.3 to 1 h and subsequent cooling, an Ni-Al compound phase and a Cu phase are dispersedly precipitated in a matrix of the steel sheet. PCOPYRIGHT: (C)2008,JPO&INPIT