Normalizing

Normalizing, which is also called normalizing, is a metal heat treatment process that is heated to Ac3 or more than Accm at 30~50 C. After a period of heat preservation, it is removed from the furnace in the air or by water spray, spray or blow cooling. The aim is to refine the grains and homogenate the carbide distribution. The difference between normalizing and annealing is that the normalizing cooling rate is slightly faster than that of annealed cooling, thus the normalizing tissue is finer than the annealed tissue, and its mechanical properties are also improved. In addition, the cooling outside the normalizing furnace does not occupy the equipment and has higher productivity. Therefore, normalizing is used instead of annealing as far as possible during the production. It is used for ductile iron to improve hardness, strength and wear resistance, such as crankshaft, connecting rod and other important parts for automobile, tractor, diesel engine. The aim is to reduce the hardness and improve the machinability, eliminate the residual stress, stabilize the size, reduce the deformation and crack tendency, refine the grain, adjust the structure and eliminate the defects of the tissue.