Cold-rolling steel is the process of steel flattening by passing the steel through a series of rollers. It is called Cold Rolling (or Cold Rolled) because the steel is kept below its recrystallization temperature. Cold rolled sheets and strips are available in a variety of conditions: full-hard, half-hard, quarter-hard and skin-rolled.
Full-hard steel has been reduced in thickness by as much as 50 percent. Full hard has a high dent resistant surface. The other conditions gradually produce less of a reduction until you reach what is called skin-rolled steel. Skin-rolled involves the least amount of reduction in thickness and is therefore extremely formable. This type of steel is used for deep drawing applications.