Process Annealing

Process Annealing:
  • In this heat treatment, steel (or any material) is heated to a temperature below critical temperature, and is held at this temperature for sufficient time and then cooled. 
  • Cooling rate is of little importance as the process is being done at sub critical temperatures
  • The purpose of this treatment is to reduce hardness and to increase ductility of cold worked steel so that further working may be carried easily.
  • This process is extensively used in the treatment of sheets and wires.
  • Parts which are fabricated by cold forming such as stamping, extrusion, upsetting and drawing are frequently given this treatment as an intermediate step. 
  • Scaling or oxidation can be prevented or minimized by this process specially if annealed at lower temperatures or in non- oxidizing areas. 

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