Cold rolled steel coil is the steel produced by cold rolling. Cold rolling is the process of further rolling steel sheet to target thickness at room temperature. Compared with hot-rolled steel sheet, cold-rolled steel sheet is more precise in thickness, smooth and beautiful in surface, and has various superior mechanical properties, especially in processing performance. Because the cold-rolled coil is brittle and hard, it is not suitable for processing, so the cold-rolled steel plate usually requires annealing, pickling and surface leveling before being delivered to customers. The maximum thickness of cold rolling is less than 0.1-8.0MM, for example, the thickness of cold rolled steel plate in most factories is less than 4.5MM, and the minimum thickness and width are determined according to the equipment capacity and market demand of each factory.