面临加工坚硬金属材料问题的工厂,有两类高速钢看来是很有希望的。一类是被称为高硬度或超硬高速钢,它包括能被淬硬到Rc63—70的一些牌号。第二类是包括增加洛氏硬度1～1/2度的几种一般标准牌号中的高碳变质钢。一、超硬高速钢:超硬高速钢的突出优点是在高温下能 There are two types of high-speed steel that appear to be promising in the face of factories that are dealing with the problem of hard metal materials. One is called high hardness or super hard high speed steel, which includes some grades that can be hardened to Rc63-70. The second category consists of several types of high-grade carbon steels, including those that increase Rockwell hardness by 1 to 1/2 degrees. First, super-hard high-speed steel: Super-hard high-speed steel is the salient advantage of the high temperature