With more than 20 years of rich experience in metallurgical projects, SME Group has persistently improved the expertise of technical engineers in cold rolling, and is dedicated to providing every customer with high-quality and reliable cold rolling project solutions according to the requirement of customers.

Cold rolling is usually done longitudinally. The process of cold rolling production generally includes raw material preparation, pickling, rolling, degreasing, annealing (heat treatment), finishing and so on. Cold rolling takes hot rolled products as raw materials, and phosphorus should be removed before cold rolling to ensure that the surface of cold rolled products is clean. Rolling is the main process that deforms materials. The purpose of degreasing is to remove the lubricating grease attached to the rolled material during rolling, so as not to pollute the steel surface during annealing, and to prevent the carburization of stainless steel. Annealing includes intermediate annealing and finished product heat treatment. Intermediate annealing is to eliminate the work hardening caused by cold deformation through recrystallization to restore the plasticity of the material and reduce the deformation resistance of the metal. The purpose of heat treatment of the finished product is to eliminate hardening through recrystallization. It is also based on the technical requirements of the product to obtain the required organization (such as various textures, etc.) and product properties (such as deep drawing, electromagnetic properties, etc.). Finishing includes checking, cutting, straightening (leveling), printing, sorting and packaging. Cold-rolled products have high packaging requirements to prevent the surface of the product from being scratched during transportation.

Since the cold rolled plate is obtained after the hot rolled plate goes through the cold rolling process, and the cold rolling will also carry out some surface finishing, the cold rolled plate is better than the hot rolled plate in the surface quality (such as surface roughness, etc.), so if there are higher requirements for the coating quality of the product after the sequence of painting, generally choose the cold rolled plate, and the hot rolled plate is divided into pickling plate and unpickling plate. Pickling plate surface has a normal metal color due to pickling, but unpickling plate usually has an oxide layer on the surface, or there is iron oxide black layer, popular speaking is the fire like, and if the storage environment is not good, usually with some rust.