| 摘要 |
PURPOSE:To manufacture steel described in the title having desirable strength, toughness, corrosion resistance, and weldability, by, after cooling, tempering at a specific temp. a steel of specific composition comprising one or more members selected from the group consisting of C, Si, Mn, Cr, and W, and one or more members selected from the group consisting of Al, and Co, and Cu if necessary, the balance being Fe. CONSTITUTION:The steel of this invention comprises one or more members selected from the group consisting of, by weight, 0.02-0.16% C, <=0.16% Si, 0.5-1.5% Mn, 5-15% Cr, 2-9% W, one or more members selected from the group consisting of 0.03-2% Al, and 0.1-5% Co, and if necessary <=1.5% Cu, the balance being Fe and inevitable impurities. PREPARATION:The steel of above-described composition is maintained at a temp. region, at which austenite and ferrite are present, for a time sufficient to establish thermodynamical equilibrium, it is then cooled at a rate sufficient to transform the austenite into mertensite. Then the steel is tempered at a temp. from 400 deg.C to the transformation point to keep the ferrite and the tempered martensite.
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