| 摘要 |
PROBLEM TO BE SOLVED: To provide a die steel for plastic molding capable or reducing the Ni amount which is a rare metal and enhancing efficiency of a heat treatment process and a manufacturing method therefor.SOLUTION: A die steel for plastic molding having a composition containing, C:0.01 to 0.15%, Si:0.5 to 2.0%, Mn:0.3 to 2.0%, Cr:2.0 to 6.0%, Ni:less than 2.0%, Al:0.5% or less, B:0.001 to 0.01%, single or composite of Mo and W of Mo+1/2W:0.4 to 1.5% and the balance Fe with inevitable impurities and regulated Cu:0.25% or less, S:0.002% or less, O:0.0015% or less and N:0.01% or less in the inevitable impurities is prepared and an aging treatment at 400°C to 550°C is conducted after a solid solution treatment on the steel. |
