Heat treatment of cast hammer can be roughly divided into three types according to different tempering temperatures.

1. Tempering at a temperature of 150℃-250℃ is called low temperature tempering, and the microstructure obtained in this process is tempered martensite. On the premise of maintaining the high hardness and high wear resistance of quenched steel, tempered martensite can reduce its quenching internal stress and brittleness, and avoid cracking or wear of the crusher hammer.

2. The temperature in the range of 350℃-500℃ is called medium temperature tempering, and the microstructure obtained in this process is tempered troostite, which can obtain high toughness and elasticity and can handle various hot working dies.

3. The temperature in the range of 500℃-650℃ is called high-temperature tempering, and the microstructure obtained in this process is tempered sorbite. The combination of quenching and high-temperature tempering is called quenching and tempering, which can improve the toughness, plasticity, hardness and strength of the crusher hammer.