Rolling is a fabricating process in which the metal, plastic, paper, glass, etc. is passed through a pair of rolls. There are two types of rolling process, flat and profile rolling. In flat rolling the final shape of the product is either sheet (thickness less then 3 mm) or plate (thickness more than 3 mm). In profile rolling, the final product may be a round rod or other shaped bar. Rolling is also classified according to the temperature of the metal rolled. If the tempreature of the metal is above its recrystallization temperature then the process is termed as hot rolling, If the temperature of metal is below its recrystallization temperature the process is termed as cold rolling .