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Introduction to Cold Rolling:
The hot rolled coil is used as raw material, and the oxide scale is removed by pickling。 The product is rolled coil。 The cold work hardening caused by continuous cold deformation makes the strength, hardness and toughness and plasticity of the rolled coil increase, so the stamping performance will deteriorate and can only be used for parts with simple deformation。 Rolled coil can be used as raw material for hot galvanizing plant because annealing lines are set up in hot galvanizing units。 The weight of rolled coil is generally 6-13。5 tons。 The hot rolled pickling coil is rolled continuously at room temperature。 The inner diameter is 610 mm。
Because of its high hardness (HRB greater than 90) and poor machinability without annealing treatment, it can only perform simple bending (perpendicular to the coiling direction) with directivity less than 90 degrees.
Cold rolling is made of Hot-rolled sheets at room temperature. Although cold rolling also warms up the steel plate during the process, it is still called cold rolling. Because of the cold rolling of hot rolling through continuous cold transformation, the mechanical properties are poor and the hardness is too high. It must be annealed to restore its mechanical properties. Rolled coils without annealing are called rolled coils. Rolled coils are generally used to make products without bending or stretching.
秒速时时彩投注Cold-rolled strips are widely used, such as automobile manufacturing, electrical products, locomotives and vehicles, aviation, precision instruments, canned food, etc. Cold-rolled sheet steel is the abbreviation of common carbon structural steel cold-rolled sheet, also known as cold-rolled sheet, commonly known as cold-rolled sheet, sometimes miswritten as cold-rolled sheet. The cold plate is a hot rolled strip of common carbon structural steel. After further cold rolling, the cold plate with thickness less than 4 mm is made. Because there is no oxide scale produced during rolling at room temperature, the surface quality of cold plate is good and the dimension accuracy is high. In addition to annealing treatment, the mechanical and technological properties of cold plate are superior to those of hot rolled thin plate. It has been gradually replaced by hot rolled thin plate in many fields, especially in the field of household appliances manufacturing.