China cold rolled tube Customized Quotes
China cold rolled tube Customized Quotes
Cold rolling is a method in which a steel sheet is further thinned to a target thickness at room temperature. Compared with hot-rolled steel sheet, cold-rolled steel sheet has more accurate thickness, smooth and beautiful surface, and also has various superior mechanical properties, especially in terms of processability.
Because cold-rolled raw coil is relatively brittle and hard to process, cold-rolled steel sheets are usually delivered to customers after annealing, pickling and surface leveling. The minimum thickness of cold-rolled steel is below 0.1-8.0MM. The thickness of cold-rolled steel plates in most factories such as Baoding Purui Steel is below 4.5MM; the minimum thickness and width are determined according to the equipment capacity and market demand of each factory.
Advantages and disadvantages of cold rolling:
advantage:
Fast molding speed, high output, 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 great plastic deformation of the steel, thereby increasing the yield point of the steel.
Cons:
1. Although there is no thermal plastic compression during the forming process, residual stress still exists 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. It is prone to torsion 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.