Cold rolling refers to cold-drawing, cold-bending, cold-drawing and other cold processing at normal temperature to process steel plates or steel strips into various types of steel.
Advantages: fast molding speed, high yield, and without damage to the coating, can be made into a variety of cross-sectional forms to meet the needs of the use conditions. Cold rolling can cause large plastic deformation of the steel, thereby increasing the yield point of the steel.
Disadvantages: 1. Although there is no thermal plastic compression during the forming process, there are still residual stresses in the cross section, which will inevitably affect the overall and local buckling characteristics of the steel.
2. The style of cold-rolled section steel is generally open cross-section, so that the free torsional stiffness of the cross-section is low. Torsion is prone to occur when bending, bending torsion buckling is easy to occur under compression, and the torsional performance is poor.
3. The thickness of the cold-rolled steel is small, and there is no thickening at the corner where the plates join, and the ability to withstand local concentrated loads is weak.