Cold rolling is hot rolled sheet roll as raw material, at room temperature in the recrystallization temperature for rolling, cold rolled steel plate is through the cold rolling process production of steel plate, referred to as cold plate. The thickness of cold rolled plate is generally between 0.1-8.0mm. The thickness of cold rolled steel plate produced by most factories is below 4.5mm. The thickness and width of cold rolled plate are determined according to the equipment capacity and market demand of each factory.