After that, heat treatment of forgings is carried out uniformly. The first step of heat treatment is: annealing, normalizing, tempering, and quenching.The function is to improve the refinement of the metal structure, improve the hardness, and help the structural stability of the forgings.The next step is shot blasting and sandblasting, removing the oxide scale on the surface, then oiling, baking, and forging the bucket teeth.