Casting common heat treatment process usually are annealing, normalizing, quenching, tempering and other steps. Annealing after casting is be heated to a certain temperature, the casting of the material, size to choose reasonable heat preservation time, in order to make metal casting internal organization to eliminate internal stress at or close to balance. Quenching is the castings after heat insulation, such as water, oil, inorganic salt medium fast cooling, purpose is to increase the hardness of castings, but casting the brittleness will increase.Casting in order to reduce the brittleness of casting, we will be higher than indoor temperature and annealing at 650 degree reasonable temperature for long time heat preservation processing, then was cold, the tempering process.Quenching and tempering are often used, be short of one cannot. Normalizing is put after the casting temperature of heating to a reasonable air for cooling, the process to get more fine microstructure, the cutting performance of castings is improved.