Heat treatment and overall heat treatment distinction between local

In the process of local heat treatment and overall heat treatment, sometimes parts are indistinguishable. If local hardness requirements are high, induction heating and other methods can be used for local quenching heat treatment. Such parts usually need to mark the location and local hardness value of local quenching heat treatment on the drawing. The hardness test of parts shall be carried out in the designated area. Rockwell hardness tester can be used to test HRC hardness. If the hardening layer of heat treatment is shallow, surface Rockwell hardness tester can be used to test hrn hardness. Chemical heat treatment chemical heat treatment is to make the surface of the workpiece permeate with atoms of one or several chemical elements, so as to change the chemical composition, structure and function of the workpiece surface. After quenching and low temperature tempering, the surface of workpiece has high hardness, wear resistance and contact fatigue strength, while the core of workpiece has high strength and toughness.

A local heat treatment method of a heat treatment component, which is a local heat treatment method only for a specific part of a heat treatment component, wherein: the said heat treatment includes an induction heating process only for induction heating of the said specific part, and a subsequent cooling process;

A heating device of the first section including one or more coils for continuous heating on the upstream side and a heating device of the second section including one or more coils for stop heating on the downstream side are arranged in advance along the conveying direction of the heat treatment component;

In the induction heating process, when a complex hardening layer pattern is required, the stop heating of the heating device of the second section is carried out after the continuous heating of the heating device of the first section;

When no complex hardening layer pattern is required, only continuous heating of the heating device of the first section is carried out and the heating device of the second section is powered on and off.