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目前美国用来制造塑料模的材料大致可以分为四类:1.调质钢主要用来制造热塑性塑料压模,大部分在注射机上使用,偶尔亦用来制造热固性塑料压模。由这种钢制造的塑料模一般不进行最后热处理,在调质到HRC32～36硬度状态使用。它的特点是可以在调质后进行精加工到成品尺寸,在镀铬后使用,因此,不存在热处理淬火变形造成报废的问题。2.渗碳钢
At present, the materials used to make plastic molds in the United States can be divided into four categories: 1. The quenched and tempered steel is mainly used to manufacture thermoplastic plastic molds, most of which are used on injection machines and occasionally used to manufacture thermosetting plastic molds. The plastic mold made of this steel is generally not the final heat treatment, quenched and tempered to HRC32 ~ 36 hardness state. It is characterized by the quenching and finishing to the finished size, after the use of chrome, so there is no heat treatment caused by quenching and deformation of the scrap problem. 2. Carburizing steel