| 摘要 |
PROBLEM TO BE SOLVED: To provide a die steel capable of retaining softening resistance and wear resistance in a high-temperature environment by optimizing the amounts of alloy elements added.SOLUTION: A matrix high-speed steel with high strength comprises, by mass%, 0.70-0.89% C, 0.30-0.80% Si, 0.45-0.95% Mn, 3.00-6.00% Cr, ≥2.00% but <4.00% Mo, ≤5.00% W, 0.40-2.00% V and ≤0.0300% N, preferably ≤0.0120% N, and the balance being Fe and unavoidable impurities, wherein Mo and W satisfy the relation: 6.00%<2Mo+W<9.00% within the ranges and an alloy element satisfying a &Dgr;C of -0.03 to 0.20 and a K value of ≥1.67 is contained, Ti content in the unavoidable impurities is ≤0.005%, preferably ≤0.003%. The steel shows hardness of 64 HRC or more when a steel is quenched at 1,100-1,180°C and tempered within 500-580°C. |
