It is process in which the metal is subjected to forces above recrystallisation temperature to give it a desired shape. Above recrystallisation temperature, the metal becomes plastic and causes of growth grains. By hot working the grains broke up and forms small new crystals which is called refinement of grains.
The various methods of hot working are:
a) Hot rolling b) Forging c) Extrusion d) Piercing e) Drawing f) Spinning