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。
2
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。
3
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.