| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot-working tool steel for die casting, excellent in heat-check resistance and capable of sufficiently restrain the crack from a water-cooling hole. SOLUTION: The hot-working tool steel has the composition composed, by mass%, of 0.1-0.3% C, 0.1-1.5% Si, 0.3-2% Mn, 6-12% Cr,≤0.05% P,≤0.01% S, 1-3% Mo, 0.5-1.5% V, 0.005-0.025% s-Al, 0.005-0.025% N,≤0.005% O and the balance Fe with inevitable impurities, and this steel is tempered at a low temperature of≤500°C after quenching to be used. COPYRIGHT: (C)2007,JPO&INPIT
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