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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