Cold-rolled plate, cold rolled steel sheet is ordinary carbon steel cold rolled sheet referred to, commonly known as cold, sometimes mistakenly written as cold rolled plate. Cold by ordinary carbon structural steel hot-rolled strip, after further cold rolling steel plate having a thickness of less than 4mm. Since rolling at room temperature, no iron oxide skin, therefore, good cold surface quality, high dimensional accuracy, coupled with annealing treatment, the mechanical properties and process performance are superior to hot-rolled steel sheet, in many areas, especially in appliance manufacturing, has gradually use it to replace the hot-rolled steel sheet.