Annealing involves heating the material to a predetermined temperature and hold the material at the temperature and cool the material to the room temperature slowly. The process involves: 
  • Heating of the material at the elevated or predetermined temperature.
  • Holding the material (soaking) at the temperature for longer time.
  • Very slowly cooling the material to the room temperature.
The various purpose of annealing process as follows: 
  • Relieve internal stresses developed during solidification, machining, forging, rolling or welding 
  • Improve or restore ductility or toughness 
  • Enhance Machinability 
  • Eliminate chemical non-uniformity 
  • Refrain grain size 
  • Reduce the gaseous contents in steel
Types of Annealing:

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