The difference between hot-rolled and cold-rolled steel sections
Advantages of hot-rolled section steel:
It can destroy the casting structure of steel ingots, refine the grain size of steel, and eliminate defects in microstructure, thereby making the steel structure dense and improving its mechanical properties. This improvement is mainly reflected in the direction of mixed rolling, so that the steel is no longer isotropic to a certain extent; The bubbles, cracks, and looseness formed during pouring can also be welded under high temperature and pressure.
Advantages of cold-rolled steel sections:
Cold rolling refers to the process of processing steel plates or strips into various forms of steel through cold drawing, bending, and drawing at room temperature. The molding speed is fast, the yield is high, and the coating is not damaged. It can be made into various cross-sectional forms to meet the needs of usage conditions. Cold rolling can cause significant plastic deformation of steel, thereby increasing its yield point.
The main differences between hot rolling and cold rolling are:
Cold rolled formed steel allows for local buckling of the cross-section, thereby fully utilizing the load-bearing capacity of the member after buckling. However, hot-rolled steel sections are not allowed to experience local buckling.
The causes of residual stress in hot-rolled and cold-rolled steel sections are different, so there should be significant differences in the distribution of residual stress on the cross-section. The residual stress distribution on the cross-section of cold-formed thin-walled steel is bending, while the residual stress on the cross-section of hot-rolled or welded steel is thin film.
The free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsional resistance of hot-rolled steel is better than that of cold-rolled steel.
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