Normalizing is a heat treatment process for plastic molds. It is similar to the annealing method. The mold steel is heated to a suitable temperature to keep it warm, and then it is completely austenitized and then cooled in air to obtain a pearlite type structure. The heating temperature of normalizing and annealing is basically the same, but the cooling rate of normalizing is faster and the transition temperature is lower. So in the injection molding process, what are the benefits of normalizing the mold steel?
Normalizing for eutectoid steel can eliminate the reticulated secondary cementite and refine the pearlite, which can improve the mechanical properties and benefit the subsequent process. For hypoeutectoid steel, it can eliminate the overheated coarse-grained structure and refine it, which is also quenching. The previous pre-heat treatment.
It can eliminate the free cementite of low-carbon deep-drawing steel plate to improve the deep-drawing performance. For low-carbon steel and low-carbon low-alloy steel, normalizing can greatly increase the hardness and obtain more flake pearls. Body tissue to avoid sticking problems during cutting. Normalizing is more economical and cheaper than other heat treatment technologies.
The high temperature of normalizing can make the components of castings and forgings diffuse faster, reduce the components evenly, and reduce the segregation of components of castings and forgings. Normalizing can refine the coarse grains at a suitable temperature.
Use normalizing treatment for low and medium carbon alloy steel to obtain bainite structure, and then after high temperature tempering, it can have good creep resistance. Normal ductile iron can also be normalized, which can effectively improve the strength of ductile iron.
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Post time: Aug-17-2021