After a cold-rolled steel sheet is cold-rolled steel production, commonly known as cold plate. Cold-rolled at room temperature is further rolled thin steel plate to the target thickness of the plate. Comparison of hot-rolled steel and cold rolled steel sheet thickness more precise and smooth, beautiful, and also offers a variety of superior mechanical properties, especially the processing performance. Comparison of the original volume because of cold brittle, not suitable for processing, so usually required after a cold-rolled steel sheet annealing, pickling, and surface roughness after to the customer. Cold minimum thickness is 0.1 - 8.0MM below, most of the plant such as cold rolled steel plate thickness of Baoding Puri is 4.5MM below; at least thickness and width of each plant based on equipment capacity and market demand for a decision. 
 Hot rolled, is based on slab (mainly billet) as raw material, heated by the rough rolling mill and finishing mill made of steel. From finishing the last one out of the hot strip mill through the laminar cooling to the set temperature, the coiling machine rolled steel strip coils, cooling the steel strip coils, according to the different needs of users, through the various finishing operations lines (smooth, straightening, cross-cutting or slitting, inspection, weighing, packaging and signs, etc) processing and a steel, flat steel products, paper and longitudinal. Something simple for a billet in the heating (that is, the kind of television red hot burning steel block) fine a few rolling road, and then trimming to correct a steel plate, this is called hot. Cold Cold: hot rolled coils as raw material, after acid washing to remove oxide scale cold rolling, the finished product as a rolling hard volume, due to continuous work hardening caused by cold deformation of the rolling hard volume strength and hardness increase , tough plastic indicators declined, so press performance will deteriorate, can only be used for simple deformation of the parts. Rolling hard copy can be used as raw material for hot dip galvanizing plant, hot dip galvanizing line are set as a back line of fire. Volume heavy rolling hard generally 6 to 13.5 tons, the coil at room temperature, the volume of hot pickling continuous rolling. Inner diameter of 610mm. Features: because there is no annealing, the hardness is high (HRB greater than 90), machining performance is extremely poor and only a simple directional bending processing less than 90 degrees (perpendicular to the coiling direction) . Something simple, the cold-rolled, hot rolled coil is processed on the basis of rolling out, in general, are hot this cold --- --- pickling process. Cold is a state at room temperature processed by the hot plate, while in the process for rolling steel will also heat up, was nevertheless called the cold. After the continuous cold rolled from the cold variant, in the relatively poor mechanical properties, hardness is too high. Must be annealed to restore its mechanical properties, there is no hard-rolling roll is called annealing. Rolling paper is generally used for hard without bending, stretching products, the thickness is below 1.0 for good luck rolling hard on both sides or four sides of bending. 1. Cold is when it is cold processed from the hot plate 2. A billet in the heating (that is, the kind of television's burning red hot steel block) fine a few rolling road, and then trimming , corrected a steel plate, this is called hot. 
 Edit this paragraph, the application of cold rolled steel 
 For cars, refrigerators, washing machines and other appliances, and industrial equipment, various building materials. 
 Edit this paragraph the main producers of cold rolled steel 
 Main origin: Baosteel, Anshan, Benxi Iron and Steel, Wuhan Iron and Steel, Handan Iron and Steel, Baotou Steel, Tangshan Iron and Steel, Lianyuan Steel, Jinan Iron and Steel, etc.