COLD ROLLING

Rolling of steel ( normally flat products) below the recrystallisation temperature of steel (normally at Room Temperature) to produce cold rolled sheets /strips /coils. Mills used for the purpose are called Cold Rolling Mills.

2Hi/4 Hi/6 Hi/20 Hi Mills: Rolling Mills are classified as 2-High / 2 Hi, 4 Hi and so on depending on Number of Rolls used in the arrangement/configuration of rolls in single stand. For example, a 2 Hi mill consist of 2 rolls one above the other known as Upper roll and the Lower roll. In a 4 Hi mill, there are 4 rolls in a stand—2 upper rolls one above the other and 2 lower rolls one above the other.