The heat treatment of steel can be divided into two categories: heat treatment and surface heat treatment. The overall heat treatment annealing, normalizing, quenching and tempering; surface heat treatment and surface hardening can be divided into two types of chemical heat treatment.
The fire is to heat the steel above the critical temperature of 30-50 DEG C, holding an appropriate time after the heat treatment process of cooling in still air is called normalizing. The main purpose of normalizing is to refine, improve the performance of the steel, close to the equilibrium state of organization.
Compared with the process of normalizing and annealing, the main difference is the fire of the cooling speed is fast, so are hot processing production cycle is short. The annealing and normalizing to achieve the same parts performance requirements, choose as far as possible is fire. Most of the medium and low carbon steel billets are generally treated with positive heat treatment. General alloy steel material used with annealing, normalizing, due to fast cooling rate, the normalized high hardness, is not conducive to cutting.
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