What are the advantages and disadvantages of cold rolling?

Disadvantages: First, although there is no thermoplastic compression in the forming process, there is still residual stress on the cross section, which will inevitably affect the overall and local buckling characteristics of steel.

Secondly, the style of cold-rolled steel is generally open section, which makes the free torsion stiffness of the section lower. Torsion is easy to occur when bending, and bending-torsion buckling is easy to occur when compressing, so the torsional performance is poor.

Third, the wall thickness of cold-rolled steel is small, and the corner of plate connection is not thickened, so the ability to bear local concentrated load is weak.

Advantages: (1) cold-rolled strip products are accurate in size and uniform in thickness, and the difference in strip thickness is generally less than 0.0 1-0.03mm, which can completely meet the requirements of high-precision tolerance. (2) Ultra-thin strip which cannot be produced by hot rolling can be obtained (the thinnest strip can be below 0.00 1mm). (3) The surface quality of cold-rolled products is superior, and there are no defects such as pockmarks and mill scale, which often occur in hot-rolled strip steel, and strip steel with different surface roughness (smooth surface or rough surface, etc.). ) can be produced according to the requirements of users, which is beneficial to the processing of the next working procedure. (4) Cold rolled strip steel has good mechanical properties and technological properties (such as high strength, low yield limit, good deep drawing performance, etc.). (5) High speed rolling and full continuous rolling can be realized with high productivity.