30CrMnSi钢发动机壳体热处理

Heat treatment of 30CrMnSi steel engine shell

为确保某发动机壳体热处理后质量性能可靠,针对30CrMnSi钢进行热处理工艺研究。利用洛氏硬度计、百分表进行硬度及径向跳动畸变量对比检验新旧热处理工艺。结果表明,采用840℃正火+880℃淬火+460~480℃中温回火后产品性能稳定性好,畸变量小,合格率明显提升,均达到了100%合格。新工艺方法取代硝盐,不仅减少有害气体的排放,而且节能环保。

In order to ensure the reliable quality and performance after heat treatment, research on heat treating process of an engine casing made of 30CrMnSi steel was implemented. The hardness and radial distortion of new and old heat treatment processes were compared and inspected by using the Rockwell hardness tester and a dial gauge. The results show that after normalizing at 840 ℃, quenching at 880 ℃, and tempering at medium temperature of 460-480 ℃, the product has good performance stability, less distortion, and significantly improved qualification rate, all reaching 100% qualification. The new process method can replace nitriding, not only reducing the emission of harmful gases, but also saving energy and environmental protection.