| 摘要 |
PROBLEM TO BE SOLVED: To provide a cast tool excellent in hot wear resistance, increased in high temp. strength and toughness, and having superior property of forming an oxide film to be formed on the surface part of the tool. SOLUTION: An oxide film having thickness of >=50μm is formed, by means of heating treatment after casting, on the surface of a tool composed of a steel having a composition consisting of, by weight, 0.08-0.18% C, 0.1-1.5% Si, 0.2-1.5% Mn, 0.25-2.5% Ni, 0.8-3.0% Cr, 1.5-4.0%, in total, of either or both of W and Mo, <=0.2% B, further either or both of 0.25-2.5% Cu and 0.25-1.0% Al, and the balance Fe with inevitable impurities.
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