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Abstract

The present invention relates a high-strength nonmagnetic stainless steel, containing, by weight percent, 0.01 to 0.06% of C, 0.10 to 0.50% of Si, 20.5 to 24.5% of Mn, 0.040% or less of P, 0.010% or less of S, 3.1 to 6.0% of Ni, 0.10 to 0.80% of Cu, 20.5 to 24.5% of Cr, 0.10 to 1.50% of Mo, 0.0010 to 0.0050% of B, 0.010% or less of O, 0.65 to 0.90% of N, and the remainder being Fe and inevitable impurities; the steel satisfying the following formulae (1) to (4):

description='In-line Formulae' end='lead'[Cr]+3.3×[Mo]+16×[N]≧30  (1),description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'{Ni}/{Cr}≧0.15  (2),description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'2.0≦[Ni]/[Mo]≦30.0  (3), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'[C]×1000/[Cr]≦2.5  (4),description='In-line Formulae' end='tail'

wherein [Cr], [Mo], [N], [Ni], [Mo] and [C] represent the content of Cr, the content of Mo, the content of N, the content of Ni, the content of Mo and the content of C in the steel, respectively, and {Ni} represents the sum of [Ni], [Cu] and [N], and {Cr} represents the sum of [Cr] and [Mo]. The present invention further relates to a high-strength nonmagnetic stainless steel part containing the steel and a process for producing the same.

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First Claim