Hot-rolled strip with thickness of 1.5-6 mm is generally used as cold-rolled blank for common thin steel sheet. The main processes are pickling, color coated plate manufacturers, color coated plate manufacturers, cold rolling, degreasing, annealing, leveling, shearing (cross cutting, longitudinal cutting). If the production of coated plate, there are also plating tin, hot tin, hot zinc coating or other coating processes. The production process of cold rolled blank is: hot rolled coil (raw material) - Pickling - cold rolling - degreasing - annealing - leveling - shearing - finished product delivery. Before rolling, the cold-rolled billet must be cleaned by continuous pickling machine to ensure the smooth surface of strip and smooth surface treatment after cold rolling. The steel can be rolled after pickling, but because of the characteristics of cold rolling process, it must be annealed to soften the steel to a certain thickness. But in the rolling process, there is lubricating oil on the surface of the strip, and oil will volatilize in the annealing furnace, and the black spots formed on the surface of the strip are difficult to remove. Therefore, before annealing, the grease on the surface of strip steel should be cleaned, that is, degreasing process. The strip after degreasing is annealed in protective gas. The surface of annealed strip is bright, and pickling is not necessary for further rolling or leveling. After annealing, the strip must be leveled to obtain a smooth surface, uniform thickness and adjust its properties. After leveling, the strip can be sheared according to the order requirements.