| 摘要 |
Provided are: a mold steel which, in addition to satisfying the basic characteristics of mold steel, also combines superior rust resistance and superior thermal conductivity; and a method for producing the same. Steel having a composition containing, in terms of mass%: 0.07 to 0.15% C; between 0 and 0.8% Si, exclusive; between 0 and 1.5% Mn, exclusive; less than 0.05% P; less than 0.06% S; between 0 and 0.9% Ni, exclusive; 2.9 to 4.9% Cr; Mo and W either alone or in a complex such that (Mo + 1/2W) is between 0 and 0.8%, exclusive; between 0 and 0.15% V, exclusive; and 0.25 to 1.8% Cu, the remainder being composed of Fe and unavoidable impurities, wherein the mold steel has a hardness of 30 to 42 HRC. Preferably, Al, which is an unavoidable impurity, is restricted to less than 0.1%, N is restricted to less than 0.06%, and O is restricted to less than 0.005%. The aforementioned hardness can be obtained through quenching and through tempering at 530°C or higher. |
