And hot rolled

1. The section of cold-rolled steel is allowed to appear local buckling, so that the bearing capacity of the rod after buckling can be fully utilized; The hot rolled section does not allow local buckling.

2. The causes of residual stress are different between hot rolled section steel and cold rolled section steel, so the distribution on the cross section is also very different. The distribution of residual stress on the section of cold-formed thin-wall steel is of bending type, while the distribution of residual stress on the section of hot-banded or welded steel is of thin film type.

3. The free torsional stiffness of hot rolled section steel is higher than that of cold rolled section steel, so the torsional resistance of hot rolled section steel is better than that of cold rolled section steel.