Technical requirements for induction heat treatment parts of high-frequency quenching equipment

The technical requirements for induction hardening of induction heat-treated parts using high-frequency quenching equipment are generally formulated by the product designer, including surface hardness, hardened area, and depth of the hardened layer. Some products also have microstructural requirements. The heating layer of induction hardening is generated by induced current heating or by eddy current conduction. It is different from carburizing with uniformly distributed carbon atoms infiltrating from the surface. Therefore, there are some special characteristics when formulating the requirements for induction hardening technology.
Hardness of induction hardened parts
After induction hardening of steel, the surface hardness value achieved is closely related to the carbon content of the steel. Taking 45 steel as an example, the average hardness value HRC achieved after induction hardening is 58.5, and the average hardness value HRC of 40 steel is 55.5.
The hardened zone of induction hardening parts
The hardening zone of induction hardening parts is the quenching area range. Due to the particularity of induction heating, in order to avoid the production of some quenching waste products, the following should generally be considered for the quenching area:
A transition zone should be left at the end of the quenched surface of the cylinder, and the end of the cylindrical shaft often has a chamfered structure. A 3-5mm non quenched zone should be left at this end, which generally does not affect the performance of the quenched section. This transition zone is the transition zone that allows for non quenched or incomplete quenching.
The quenching zone should have a clear tolerance range. Induction hardening zone, like machining, should have a tolerance range. If the usage conditions permit, this tolerance range can be slightly larger.
Depth of hardening layer of induction hardened parts
According to the international standard ISO3754 and the national standard GB/T5617-2005, the effective hardening layer depth of induction hardened parts is determined by measuring the hardness of the part section.