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工业上已经广泛的使用着铬合金钢以及铬镍合金钢。而在机械制造的很多部门里(透平发电机械制造、铲掘机械制造等等),对于所使用的零件,要求具有更高的强度、靱性和塑性,同时要求钢的内部应力要最低。为了满足这一些要求,就采用了缓慢冷却的回火方法;而且为了消除脆性,也就是提高靸性,钢里加了大量(0.3—0.6%)的钼。在重型机械制造中,零件的尺寸和规格,都是十分巨大的;在整个断面上,都要有限高的机械性能,
Chromium alloy steel and chromium-nickel alloy steel have been widely used industrially. In many parts of machinery manufacturing (turbine power machinery manufacturing, shovel machinery manufacturing, etc.), the parts used require higher strength, flexibility and plasticity, while requiring the lowest internal stress of the steel. In order to meet these requirements, slow cooling of the tempering method was used; and in order to eliminate brittleness, that is, to improve the 靸, add a large amount of steel (0.3-0.6%) molybdenum. In heavy machinery manufacturing, the dimensions and specifications of the parts are enormous, with limited high mechanical properties throughout the cross section,