Cold rolling refers to the rolling production mode below the recrystallization temperature. Can be divided into two categories, one is the cold rolled hard plate without annealing treatment, referred to as rolled hard, hardness is greater than HRB85, characteristics: high mechanical strength, poor ductility; Second, after annealing treatment of cold rolled annealed plate, referred to as cold rolled plate, hardness of about HRB60, characteristics: moderate mechanical strength, good ductility. Can be widely used in sports equipment, bed frame, shelves, fire facilities and other uses.