What is the difference between normalizing and annealing of steel plates

Normalizing and annealing are both common heat treatment methods for steel plates. Normalizing is a heat treatment process to heat the workpiece to 30~50℃ above Ac3 or Accm. After holding for a period of time, take out the metal cooled in the air or by water, spray or blowing from the furnace. The purpose is to refine the grains and to homogenize the carbide distribution.

The difference between normalizing and annealing is that the cooling rate of normalizing is slightly faster than that of annealing, so the normalizing structure is finer than the annealing structure, and its mechanical properties are also improved. In addition, the external cooling of the normalizing furnace does not occupy equipment, and the productivity is high. Therefore, normalizing is used as much as possible to replace annealing in production.