PURPOSE:To manufacture a steel for prehardening metal mold for plastic molding having superior machinability and grinding finish characteristic, by incorporating specific percentage of C, Si, Mn, Ni, Al, and Cu to Fe. CONSTITUTION:A steel which has a composition consisting of, by weight 0.08-0.17% C, =0.60% Si, 0.50-1.20% Mn, 2.50-3.50% Ni, 0.85-1.50% Al, 1.80-2.50% Cu, and the balance Fe with usual impurities and containing, if necessary, =0.50$ Cr and/or either or both of Mo and W independently or in combination so that 1/2W+Mo=0.10-0.70% is satisfied is prepared. This steel is provided in a prehardened state with a hardness of HRC37 or above and is subjected, in this state, to die sinking and grinding work, and further to high-degree mirror finish and crimping working treatment and used.
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机译：目的：通过将一定比例的C，Si，Mn，Ni，Al和Cu掺入Fe中，以制造具有优异的切削性和磨削光洁度特性的用于塑料成型的金属模具预硬化用钢。组成：一种钢，其成分为0.08-0.17％C，<= 0.60％Si，0.50-1.20％Mn，2.50-3.50％Ni，0.85-1.50％Al，1.80-2.50％Cu和制备具有普通杂质并必要时含有＜＝ 0.50Cr和/或Mo和W中的任一个或两者独立或组合的余量的Fe，从而满足1 / 2W + Mo ＝ 0.10-0.70％。将该钢以预硬化状态提供，其硬度为HRC37或更高，并在此状态下进行模具下沉和磨削加工，然后进一步进行镜面高度抛光和卷边加工处理并使用。
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