| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength nonmagnetic stainless steel having excellent strength, corrosion resistance and workability, and to provide a high strength nonmagnetic stainless steel component using the same and its production method. SOLUTION: Disclosed is a high strength nonmagnetic stainless steel having a composition comprising, by mass, 0.01 to 0.06% C, 0.10 to 0.50% Si, 20.5 to 24.5 Mn,≤0.040% P,≤0.010% S, 3.1 to 6.0% Ni, 0.10 to 0.80% Cu, 20.5 to 24.5% Cr, 0.10 to 1.50% Mo, 0.0010 to 0.0050% B,≤0.010% O and 0.65 to 0.90% N, and the balance Fe with inevitable impurities, and satisfying expressions (1) to (4): (1) <<P.I>>=[Cr]+3.3×[Mo]+16×[N]≥30; (2) äNi}/äCr}≥0.15, where äNi}=[Ni]+[Cu]+[N] and äCr}=[Cr]+[Mo]; (3) 2.0≤[Ni]/[Mo]≤30.0; and (4) [C]×1,000/[Cr]≤2.5. COPYRIGHT: (C)2009,JPO&INPIT |
