Improve properties by altering the structure of the material.
 
Heat Treatment process generally includes heating, holding, cooling three processes, these processes are interlocked and can not be interrupted. Heat treatment is the metal material in a controlled atmosphere or protective atmosphere, molten salt and vacuum heating to above the phase change temperature to obtain high-temperature tissue, insulation for a certain period of time, so that the internal and external temperatures are consistent, so that the microstructure transformation is complete, with a certain rate of cooling to room temperature or lower, so as to improve the structure of the material, to obtain excellent performance of the material.