Cold rolling refers to a rolling method that uses the pressure of a roller to squeeze the steel to change the shape of the steel at room temperature. Although the processing also heats up the steel plate, it is still called cold rolling.
Generally, cold-rolled steels such as galvanized and color steel plates must be annealed, so they have better plasticity and elongation, and are widely used in industries such as automobiles, home appliances, and hardware. The surface of the cold-rolled steel plate has a certain degree of smoothness and is relatively smooth to the touch, mainly due to the work of pickling. The change of cold rolling to the shape of the steel belongs to continuous cold deformation. The cold work hardening caused by this process increases the strength and hardness of the rolled hard coil, and the ductility index decreases.
Advantage:
Cold rolling can destroy the casting structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved.
Disadvantage:
1. Although there is no thermal plastic compression during the forming process, residual stress still exists in the section, which will inevitably affect the overall and local buckling characteristics of the steel;
2. The cold-rolled section steel style is generally an open section, which makes the free torsional stiffness of the section lower. It is prone to torsion when under bending, and it is prone to bending and torsion buckling when under pressure, and its torsion resistance is poor;
3. The wall thickness of cold-rolled steel is small, and there is no thickening at the corners where the plates are joined, and the ability to withstand local concentrated loads is weak.
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