热处理工艺: 渗碳，碳氮共渗，光辉淬火，调质
Heat Treatment: Carburizing, Carbonitriding, Bright Quenching and Through Hardening

优点: 变形量小。因为工件有特定的排列方式，渗碳和碳氮共渗的渗碳均匀，并且碰伤几率小。
Advantages: Low deformations. The parts are racked in specific ways. Uniform carburized and carbonitriding cases. Little chances of part damages caused by touching each other.