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齿轮是汽车的重要零件,至今仍沿用低碳合金钢渗碳。齿轮用钢大体经下列几个阶段:二次世界大战前,主要用Ni钢、Ni—Cr钢等高级高合金钢;二次大战后,已逐渐使用低Ni或无Ni合金钢。近十几年来,从发展趋势看,齿轮用钢已从高级特殊钢过渡到低合金钢的低级钢阶段,低Ni和无Ni是各国普遍现象。各国用钢取决于各国资源。例如美国的Mo比较多,所以用纯Mo系列的钢较多;日本没有Mo,多采用Cr和Cr—Mn和系列的钢;西德则是Mo—Cr钢。为向低质低合金钢方面发展,许多国家正在全面研究用Mn—B钢制造汽车拖拉机齿轮。众所周知,对齿厚为5～12毫米的中模数齿轮的表面强化的工艺,迄令没有得到命人满意
Gear is an important part of the car, still use low carbon steel carburizing. Gear steel generally through the following stages: before the Second World War, the main use of Ni steel, Ni-Cr steel and other high-alloy steel; After the Second World War, the gradual use of low Ni or no Ni alloy steel. In recent decades, from the development trend, gear steel has been transition from high-grade special steel to low-alloy steel low-grade steel stage, low Ni and Ni-free is a common phenomenon in all countries. Steel used in various countries depends on the resources of various countries. For example, the United States Mo more, so with pure Mo series of steel more; Japan does not have Mo, use more Cr and Cr-Mn and series of steel; West Germany is Mo-Cr steel. In order to develop low-quality low-alloy steel, many countries are fully studying the manufacture of automobile tractor gears with Mn-B steels. As we all know, on the tooth thickness of 5 to 12 mm in the modulus of the surface of the gear strengthening process, so far has not been satisfactory