Cold Rolling Mill

Cold Rolling Mill

Cold rolling is made of hot-rolled coils as raw materials, which are rolled at room temperature below the recrystallization temperature. The thickness of cold-rolled sheet is generally between 0.1--8.0mm. The thickness of cold-rolled sheet produced by most factories is below 4.5mm. The thickness and width of cold-rolled sheet are determined according to the equipment capacity and market demand of each factory.

Cold rolling: using hot-rolled steel coil as raw material, after pickling to remove oxide scale, cold rolling is carried out, and the finished product is hard-rolled coil. The plastic index decreases, so the stamping performance will deteriorate, and it can only be used for parts with simple deformation. Hard-rolled coils can be used as raw material for hot-dip galvanizing plants, because hot-dip galvanizing lines are equipped with annealing lines. The weight of the rolled hard coil is generally 6~13.5 tons, and the hot-rolled pickled coil is continuously rolled at room temperature. The inner diameter is 610mm.

Product features: Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor. Only simple directional bending less than 90 degrees (perpendicular to the coiling direction) can be performed.

To put it simply, cold rolling is processed and rolled on the basis of hot rolled coils. Generally speaking, The process of cold rolling production generally includes raw material preparation, pickling, rolling, degreasing, annealing (heat treatment), finishing, etc..

Cold rolling is processed from hot-rolled sheets at room temperature. Although the temperature of the steel sheet will be heated up during the processing, it is still called cold rolling. Due to the continuous cold deformation of hot rolling, the mechanical properties are relatively poor and the hardness is too high. It must be annealed to restore its mechanical properties, and those without annealing are called hard rolled coils. Hard rolled coils are generally used to make products that do not require bending or stretching.

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.