1) Reduce internal stress and brittleness. Quenched parts have great stress and brittleness. They will often deform or even crack if they are not tempered in time.

2) Adjust the mechanical properties of the workpiece. After quenching, the workpiece has high hardness and brittleness. To meet the different performance requirements of various workpieces, the hardness, strength, plasticity, and toughness can be adjusted through tempering.

3) Stable workpiece size. Tempering can stabilize the metallographic structure to ensure that it will no longer deform during subsequent use.

4) Improve the cutting performance of certain alloy steels.

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