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Abstract

The chemical composition of a stainless steel in accordance with the present invention consists of C: not more than 0.05%, Si: not more than 0.5%, Mn: 0.01 to 0.5%, P: not more than 0.04%, S: not more than 0.01%, Cr: more than 16.0 and not more than 18.0%, Ni: more than 4.0 and not more than 5.6%, Mo: 1.6 to 4.0%, Cu: 1.5 to 3.0%, Al: 0.001 to 0.10%, and N: not more than 0.050%, the balance being Fe and impurities, and satisfies Formulas (1) and (2). Also, the micro-structure thereof contains a martensitic phase and a ferritic phase having a volume ratio of 10 to 40%, and the ferritic phase distribution ratio is higher than 85%.

description='In-line Formulae' end='lead'Cr+Cu+Ni+Mo ≧25.5  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'−8 ≦30(C+N)+0.5Mn+Ni+Cu/2+8.2−1.1(Cr+Mo) ≦−4  (2)description='In-line Formulae' end='tail'

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First Claim