Hot-rolled as for cold-rolled, cold rolling below the recrystallization temperature, rolling and hot rolling is carried out above the recrystallization temperature.

Can destroy the organization of ingot casting, refining the grain of the steel, and eliminate the defects of the microstructure, so that the steel organization compacting, mechanical properties improved. This improvement mainly reflected in the rolling direction, so that the steel to a certain extent, is no longer isotropic; pouring the formation of bubbles, cracks and loose, but also in the high temperature and pressure welding.