The cold-rolled strip production process mainly includes steps such as billet preparation, pickling, cold rolling, annealing and finishing.
The blank preparation requires chemical composition, width and thickness dimensional tolerances (three-point difference and same-strip difference), and sickle bending should meet the requirements. The raw materials need to have a smooth surface and must not have cracks, folds, pores, non-metal inclusion defects, etc.
Before pickling, the strip steel should be straightened and butt welded to facilitate continuous pickling. Pickling is mainly to remove iron oxide scale. During the pickling process, the concentration and temperature of the acid solution and the ferrous salt content in the acid solution should be controlled.
To control the thickness and plate shape, the reduction, speed, tension and roll type should be adjusted. The thickness is mainly controlled by AGC, and the plate shape is mainly controlled by adjusting the roll profile (roller crown and crown compensation measures), such as HC, CVC, etc.
Annealing is divided into intermediate annealing and finished annealing. Intermediate annealing is to eliminate work hardening, and product annealing to obtain the required structure and properties. Annealing furnaces include continuous annealing furnaces and bell annealing furnaces. The annealing process of the bell annealing furnace should control the proportion, heating time, and cooling time of the protective gas in the furnace; the annealing process of the continuous annealing furnace should control the temperature, speed, time, and atmosphere according to the annealing curve. Controlling the strip tension in the furnace ensures the plate shape, and controlling the crown of the furnace roller can prevent the strip from deflecting.
Finishing includes smoothing, cutting, oiling and packaging. Smoothing improves board shape, cleans the surface and achieves desired performance. The elongation of the strip should be controlled during the flattening process. Shearing mainly controls size and surface quality. The oil should be applied evenly. Packaging should meet the specified requirements and facilitate storage, transportation and delivery.

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