Difference between Full Annealing and Process Annealing

full annealing process annealing

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A quick comparison between full annealing and process annealing of steel

Full annealing


  • Heat eutectic steel 30 to 50 °C above its critical temperature, keep it at that temperature for while then slowly cooled down.
  • Suitable in low mild steel as well as in high carbon steel.
  • Phase transformation occurred during the full annealing process. The resulting crystal structure is laminated perlite.
  • Resulted metal is more ductile, and this process is used in steel for deep drawing operation.


Process annealing


  • Steel heated below the critical temperature, keep it at that temperature for while then cooled slowly. Also called subcritical annealing.
  • Suitable for low carbon steel
  • Phase transformation not involved in this process. The material is in the same phase in throughout the process.
  • Process annealing is cheaper than full annealing.
  • Used in sheet metal and wire industries.


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