Quenching and tempering treatment refers to the double heat treatment method of quenching and high temperature tempering, and its purpose is to make the workpiece have good comprehensive mechanical properties. High temperature tempering refers to tempering between 500-650 °C.

Quenching and tempering can adjust the properties and materials of steel to a great extent. Its strength, plasticity and toughness are all good, and it has good comprehensive mechanical properties. After quenching and tempering treatment, tempered sorbite is obtained. Tempered sorbite is formed when martensite is tempered, and it can only be distinguished by magnifying more than 500~600 times under an optical microscope. carbon body) composite organization of spherulites. It is also a tempered structure of martensite, which is a mixture of ferrite and granular carbide. At this time, the ferrite has basically no carbon supersaturation, and the carbides are also stable carbides. It is a balanced tissue at room temperature.

Quenching treatment method

Quenching and tempering treatment: The heat treatment method of high temperature tempering after quenching is called quenching and tempering treatment.

Aging treatment method

Aging treatment: In order to eliminate the changes in size and shape of precision measuring tools or molds and parts during long-term use, the workpiece is often reheated to 100-150°C after low temperature tempering (low temperature tempering temperature 150-250°C) before finishing. , keep it for 5-20 hours, this kind of treatment to stabilize the quality of precision parts is called aging. It is particularly important to age steel components under low temperature or dynamic load conditions to eliminate residual stress and stabilize the structure and size of the steel.