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Abstract

This invention provides the following stainless steels called invention steel 1 and invention steel 2. Invention steel 1 is a subzero treatment hardening type martensitic stainless steel characterized by comprising not more than 0.4% by weight of C, not more than 0.4% by weight of N, not more than 15% by weight of Mn, not more than 12% by weight of Ni, 10 to 23% by weight of Cr, not more than 3.0% by weight of Mo, not more than 5.0% by weight of Cur, not more than 2.0% by weight of Si, and the remaining portion consisting of inevitable impurities and Fe and satisfying the following formaulae (1), (2) and (3), [Cr %]+1.5[Si %]+[Mo %]-[Mn %)]-1.3[Ni %]-[Cu %]-19 [C %]-19[N %].ltoreq.12.0 Formula (1) 27.5.ltoreq.[Cr %]+1.3[SDi %]+1.3[Mn %]+1.5[Ni %]+[Cu %]+[Mo %]+15[C %]+20[N %].ltoreq.32.0 Formula (2) and 1.3[Ni %]+[Mn %]+[Cu %]>4.0 Formula (3) Invention steel is a subzero treatment hardening type martensitic stainless characterized by comprising not more than 0.4% by weight of C, not more than 0.4% by weight of Mn, not more than 3.0% by weight of Ni, 10 to 23% by weight of Cr, not more than 3.0% by weight of Mo, not more than 2.0% by weight of Cu, not more than 2.0% by weight of Si and the remaining portion consisting of inevitable impurities and Fe and satisfying the above formulae (1) and (2), and the following formula (4), 1.3[Ni %]+[Mn %]+[Cu %].ltoreq.4.0 Formula (4)

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First Claim