| 摘要 |
A high strength, high toughness stainless steel consisting, by weight percent of: 0.16 to 0.25% C, up to 2.0% Si, up to 1.0% Mn, up to 2.0% Ni, 11 to 15% Cr, 12 to 21% Co, 0.5 to 3.0% Mo, at least one of the two following elements 0.1 to 0.5% V and up to 0.1% NB, the balance being Fe and incidental impurities. This steel is produced by a method comprising the steps of: preparing a stainless steel having the above-described composition, subjecting the steel to a solution heat treatment at a temperature of 950 to 1150 DEG quenching the steel; subjecting the steel to a sub zero treatment at a temperature of -50 to -100 DEG C; and subjecting the steel to a tempering at a temperature of 120 to 450 DEG C.
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