Mold steel quenching is heating the mold steel to a certain temperature and keep it warm for a certain period of time, and then quickly cooling it. This process is called quenching. The main purpose of quenching is to make all or most of the structure of the mold steel change to austenite, obtain high toughness, and then quench at an appropriate temperature so that the product workpiece has the expected properties. Quenching is an extremely critical task in the heat treatment method to achieve the required comprehensive physical properties and wear resistance. Whether it is successful depends mainly on the heating rate, quenching temperature, holding time, and subsequent cooling method. For the heating rate, the temperature rise is too slow during heating, the product workpiece is easy to oxidize and carburize, the service life of the workpiece is low, and the cost is increased. However, if the temperature is raised too high, the surface and the center of the mold will cause a temperature difference. The greater the temperature difference, the greater the internal stress, and therefore, the greater the probability of deformation cracking.

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