Difference between Full Annealing and Process Annealing
🔗What is Annealing? - Objectives and Advantages
🔗What is Heat Treatment Of metal? - What are its advantages
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.
