The heat treatment method of high temperature tempering after quenching is called quenching and tempering treatment.High temperature tempering refers to tempering between 500-650°C.Quenching and tempering can make the performance and material of steel be adjusted to a large extent, and its strength, plasticity and toughness are good, and it has good comprehensive mechanical properties.After quenching and tempering, tempered sorbite is obtained.

　　Tempered sorbite is formed during tempering of martensite. It can be distinguished by magnification of 500~600 times or more under an optical metallographic microscope. It is a ferrite matrix with carbides (including Cementite) the composite structure of spherulites.

　　Its mechanical properties are better than those of normalized sorbite with the same hardness.Its hardness depends on the high-temperature tempering temperature and is related to the tempering stability of the steel and the size of the workpiece section. It is generally between HB200-350.Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing processes, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the internal microstructure of the workpiece, or changing the chemical composition of the surface of the workpiece , To give or improve the performance of the workpiece.

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