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Tempering principle: Tempering is hardened after the workpiece is heated to AC1 below a certain temperature, heat for a certain time, and then cooled to room temperature heat treatment process.
Tempering is followed by quenching, and its purpose is:
1. To eliminate the residual stress generated when quenching the workpiece to prevent deformation and cracking;
2. Adjust the hardness, strength, plasticity and toughness of the workpiece to meet the performance requirements;
3. Stable organization and size, to ensure accuracy;
4. Improve and improve processing performance.
Therefore, tempering is the last important process for the workpiece to achieve the desired performance.
According to the tempering temperature range: tempering can be divided into low temperature tempering, middle temperature tempering and high temperature tempering.link:http://www.cnfuruide.com/alloy-steel-wire/oil-quenched-and-tempered-carbon-spring-steel-wire/oil-tempered-steel-wire-for-mechanical.html