The hot rolled strip coil is rolled and rolled at high temperature, and the oxidized iron sheet generated on the surface of the strip can be firmly covered on the surface of the strip and cover the surface defects of the strip. If these strips with oxidized iron are sent directly to the cold rolling mill for rolling, it will affect the surface quality and processing performance of the cold rolled sheet, and even cause damage to the circulation equipment and cold roll damage. Therefore, strip steel must be removed before cold rolling. The work of removing the oxide sheet is usually done by the pickling unit. Therefore, pickling is the process of removing the oxide scale on the metal surface by chemical methods, so it is also called chemical pickling. Pickling according to its production method is usually divided into: acid method, alkali-acid method, hydride method, electrolysis method and so on. However, the vast majority of continuous units use sulfuric acid or hydrochloric acid pickling methods.

The surface quality is good, compared with the ordinary hot-rolled plate, the hot-rolled pickling plate removes the surface oxide sheet, improves the surface quality of the steel, and is easy to weld, oil and paint. The dimensional accuracy is high, and after leveling, the plate shape can be changed to a certain extent, thereby reducing the deviation of unevenness. Improves the surface finish and enhances the appearance

High dimensional accuracy, hot rolled pickling coil after leveling, can make certain changes in the shape of the plate, so as to reduce the deviation of roughness, improve the surface finish, enhance the appearance of the effect.

In the automobile, home appliances, machinery, light industry hardware and other industries have been widely used, the market demand continues to increase, and has become one of the development directions of hot rolling deep processing products in various steel mills, some domestic steel mills have built a number of professional hot rolling pickling production lines.