Annealing Process

Annealing is a opposite process of hardening process.

Why annealing process have to perform : 

Relieve internal stress
Soften material
Increase ductility
Refine the grain structure

Process :

Material is heated above the re-crystallization temperature and hold material at specific temperature and time. And last material is cool at room temperature.

Cooling process is depend upon the metal and required properties.

Usually material are cooled inside the furnace. Also material is cooled by burying them in ashes, lime, or other insulating materials.