| 摘要 |
PROBLEM TO BE SOLVED: To provide a spring material made of stainless steel using metastable austenitic stainless steel as a base and having excellent strength, corrosion resistance, spring properties or the like. SOLUTION: The stainless steel has a composition comprising, by mass,≤0.15% C, 1.0 to 4.0% Si,≤5.0% Mn,≤0.040% P,≤0.010% S, 4.0 to 10.0% Ni, 13.0 to 18.0% Cr, 0 to 3.5% Cu, 1.0 to 5.0% Mo,≤0.15% N,≤0.15% Nb,≤0.05% Ti,≤0.20% V,≤0.015% O,≤0.70% 2Nb+4Ti+V, and the balance Fe with inevitable impurities, and in which the value of Md(N) defined as Md(N)=580-(520C+2Si+16Mn+16Cr+23Ni+300N+10Mo) is set to the range of 0 to 100. The stainless steel may be as cold-rolled, but is preferably subjected to aging treatment of performing holding at 300 to 500°C for 0 to 20 hr after the cold rolling. COPYRIGHT: (C)2007,JPO&INPIT
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