What's the difference between normalizing furnace and annealing furnace

Normalizing, also known as normalizing, is to heat the workpiece to Ac3 or Accm above 30~50 C for a period of time. After heat preservation for a period of time, the metal heat treatment process is taken out of the furnace in air or spray water, spray or blow cooling. The aim is to refine the grains and distribute the carbides evenly.

Annealing: a metal heat treatment process in which the metal is heated to a certain temperature at a slow rate for a sufficient period of time and then cooled at a suitable rate (usually slow cooling, sometimes controlled cooling).

The purpose is to soften the materials or workpieces that have been forged, cast, welded or machined, improve the plasticity and toughness, which makes the chemical composition distribution more uniform, remove the residual stress, or obtain the expected physical properties. There are many kinds of annealing processes with different purposes, such as recrystallization annealing, homogenization annealing, recrystallization annealing, isothermal annealing, spheroidization annealing, stress removal annealing, stabilization annealing and magnetic field annealing. The difference between normalizing furnace and annealing furnace is that normalizing cooling speed is slightly faster than annealing cooling speed, so normalizing structure is finer than annealing structure, and its mechanical properties are also improved. In addition, there is no need to use equipment for cooling outside the normalizing furnace, so the productivity is high, so normalizing is used instead of annealing in production as much as possible.


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