| 摘要 |
PROBLEM TO BE SOLVED: To obtain steel for a mold for molding plastics combining excellent mirror surface finishing properties with machinability. SOLUTION: The steel has a composition which consists of 0.01 to 0.15% C, 0.5 to 2.0% Si, 0.3 to 2.0% Mn, 2.0 to 6.0% Cr, 2.0 to 5.0% Ni, 0.5 to 2.0% Cu, 0.5 to 2.0% Al,≤0.01% B and the balance Fe with inevitable impurities and contains, if necessary, either or both of≤1.0% Mo and≤1.0% W and in which, among the inevitable impurities, the contents of S, O and N are regulated to≤0.002%,≤0.0015% and≤0.01%, respectively. By this method, a metal mold for molding plastics combining excellent machinability and mirror surface finishing properties and having high hardness and excellent corrosion resistance can be obtained. COPYRIGHT: (C)2004,JPO
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