What are the advantages and disadvantages of cold rolling?

1, the size of cold-rolled coil products is accurate, the thickness is uniform, and the thickness difference is generally less than 0.0 1-0.03mm, which can completely meet the requirements of high precision tolerance;

2. The ultra-thin strip which cannot be produced by hot rolling can be obtained (the thinnest can be below 0.00 1mm);

3. The surface quality of the rolled products is superior, and there are no defects such as pockmarks and mill scale, which often occur in hot rolled coils, and there are no coils 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. The rolled plate has good mechanical and technological properties (such as high strength, low yield limit and good deep drawing performance);

5. High-speed rolling and full continuous rolling are realized, and the productivity is high.

Disadvantages of cold rolling:

1. There is no thermoplastic compression in the forming process, but there is still residual stress in the section, which will inevitably affect the overall and local buckling characteristics of steel;

2. 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;

3. The wall thickness of cold-rolled steel is small, and it is not thickened at the corner where the plates are connected, so the ability to bear local concentrated load is weak.

Cold rolling and hot rolling are two different steel rolling technologies.

1, cold rolling is carried out at room temperature;

2. After a billet is heated (that is, a red and hot steel block burned on TV), it is finely rolled several times, and then trimmed and corrected into a steel plate. This is called hot rolling.