Production process

Cold rolling is usually longitudinal rolling. The process of cold rolling production generally includes raw material preparation, pickling, rolling, degreasing, annealing (heat treatment), finishing, etc. Hot rolled products are used as raw materials for cold rolling. Phosphorus removal of raw materials is required before cold rolling to ensure clean surface of cold rolled products. Rolling is the main process to deform materials. The purpose of degreasing is to remove the lubricating grease attached to the rolled material when rolling, so as not to pollute the steel surface when annealing, and also to prevent the carburization of stainless steel. Annealing includes intermediate annealing and heat treatment of finished products. Intermediate annealing is to eliminate work hardening during cold deformation by recrystallization, so as to restore the plasticity of materials and reduce the deformation resistance of metals. The purpose of heat treatment of finished products is to eliminate hardening by recrystallization. It is also based on the technical requirements of the product to obtain the required structure (such as various textures, etc.) and product properties (such as deep drawing, electromagnetic properties, etc.). Finishing includes inspection, cutting, straightening (leveling), printing, classification and packaging. Cold rolled products have high packaging requirements to prevent surface scratches during transportation. In addition to the above process, some special products have their own special processes. For example, when rolling silicon steel plate, decarbonization annealing should be carried out before cold rolling, after rolling, coating, high temperature annealing, stretch straightening (see tension straightening) and tempering, etc.

The material: VW 50065 CR380LA