Cold rolling is a steel sheet in which the steel sheet is further thinned to a target thickness below the recrystallization temperature under room temperature conditions.
Compared with hot rolled steel, the thickness of cold rolled steel is more accurate, and the surface is smooth and beautiful. Cold-rolled sheets generally do not have a heating process before rolling. However, due to the small thickness of the strip, it is easy to have problems with the shape of the strip. Therefore, in order to control the dimensional accuracy and surface quality of the strip, many complicated processes are used.
The cold rolling production line is long, the equipment is many, and the process is complicated. With the improvement of users' requirements for strip dimensional accuracy, shape and surface quality, the control model, l1 and l2 systems, and shape control methods of cold rolling mills are more than those of hot rolling. And the temperature of the roll and strip is also one of the more important control indicators.
By definition, ingots or billets are difficult to deform at room temperature and difficult to process, and most steels are rolled by hot rolling. However, because iron oxide scale is easily formed on the surface of steel at high temperature, the surface of hot-rolled steel is rough and the size fluctuation is large. Therefore, steel with smooth surface, accurate size and good mechanical properties is required. Hot-rolled semi-finished products or finished products are used as raw materials and then cold produced by rolling method.
Type of use
Cold-rolled strips are widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, and canned food.
Cold-rolled sheet is the abbreviation of ordinary carbon structural steel cold-rolled sheet, also known as cold-rolled sheet, commonly known as cold-rolled sheet, and sometimes mistakenly written as cold-rolled sheet. The cold plate is a hot-rolled steel strip of ordinary carbon structural steel, which is further cold-rolled into a steel plate with a thickness of less than 4mm. Due to rolling at room temperature, no scale is produced. Therefore, the cold plate has good surface quality and high dimensional accuracy. Coupled with annealing treatment, its mechanical properties and process properties are superior to those of hot-rolled steel sheets. In many fields, especially In the field of home appliance manufacturing, it has gradually replaced hot-rolled sheet steel.
