Hot treatment: vacuum, carburizing, nitriding, vacuum heat treatment and cryogenic treatment etc.
热处理：真空，渗碳，渗氮，真空热处理，超低温处理等。
Top low carbon alloy steel as gear material, adapting automatic carburizing and quenching heat treatment.
齿轮材料选用高级低碳合金钢，使用自动化高温渗碳淬火处理。
The effect of deep cooling treatment after carburizing on properties of 20 steel is studied and the effect mechanism of the deep cooling treatment is analyzed.
研究了渗碳后深冷处理对20钢机械性能的影响，分析讨论了深冷处理的作用机理。
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