Advantages and disadvantages of hot-rolled steel

Advantages of hot-rolled steel:
It can destroy the casting structure of steel ingot, refine the grain of steel, eliminate the defects of microstructure, make the structure of steel compact and improve the mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to some extent; The bubbles, cracks and pores formed during pouring can also be welded under the action of high temperature and high pressure.

Disadvantages of hot-rolled steel:
Residual stress caused by uneven cooling after hot rolling. Residual stress is an internal self-balancing stress without external force, which exists in various hot-rolled steel sections. Generally speaking, the larger the section size, the greater the residual stress. Although the residual stress is self-balanced, it still has some influence on the performance of steel members under external forces. For example, it may have adverse effects on deformation, stability and fatigue resistance.