| 摘要 |
PROBLEM TO BE SOLVED: To provide stainless steel for a pressure bar spring of electronic parts which has high strength and excellent fatigue characteristics, and requires thinning. SOLUTION: The stainless steel has a composition containing <=0.15% C, 1.0 to 4.0% Si, <=5.0% Mn, <=0.040% P, <=0.010% S, 4.0 to 10.0% Ni, 12.0 to 18.0% Cr, 0 to 3.5% Cu, 1.0 to 5.0% Mo, <=0.15% N, <=0.02% Nb, <=0.015% Ti, <=0.015% O, >=0.10% C+N and >=3.5% Si+Mo, and the balance substantially Fe, and in which the value of Md(N) defined as Md(N)=580-(520C+2Si+16Mn+16Cr+23Ni+300N+10Mo) lies in the range of 0 to 100. The maximum area of nonmetallic inclusions precipitated into the matrix is preferably controlled to <=40μm<2> .
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