Explanation

A surface heat treatment process that only makes the surface of steel workpiece quenching. The purpose is to improve the hardness, wear resistance and fatigue strength of the workpiece surface, while the central part still has high toughness. Commonly used for parts such as shafts and gears. During operation, the surface layer of the workpiece is austenitization by means of rapid heating, and then the surface layer is transformation into martensite by quenching immediately, while the core structure is basically unchanged. Low temperature tempering is generally carried out after case hardening. According to different heating methods, it can be divided into induction heating case hardening, flame heating case hardening, electric contact heating case hardening, and electrolyte heating case hardening, among which the former two methods are most widely used.

Classification