The invention discloses a rolling process of
bismuth-containing free
cutting steel. The process comprises the following steps of: controlling the
heating temperature at 1,150-1,230 DEG C; controlling the rolling temperature at 1,130-1,200 DEG C in a rough rolling step, wherein the
standard material type size is used in each pass of rough rolling; controlling the rolling temperature at 1,000-1,060 DEG C in a medium rolling step, wherein the
standard material size is used for
rolling mill material types; controlling the rolling temperature at 900-950 DEG C in a pre-finish rolling step, wherein the
standard material type size is used for
rolling mill material types; controlling the rolling temperature at 930-980 DEG C in a finish rolling step, wherein the standard
material type is used for
rolling mill material types; and controlling the final rolling temperature at 810-830 DEG C. As the cooling water amount is controlled through
process requirements and the
deformation control temperature of each section is ensured in the rolling and deformation course, surface cracks and corner cracks generated in the rolling and deformation course and after deformation of a rolled piece can be prevented, a drawing steel accident caused by head splitting is avoided, the smooth rolling of the
bismuth-containing free
cutting steel is realized, the product surface quality is improved, medium wastes and inspection wastes are obviously reduced, the
yield rate is greatly improved, and figured steel free
cutting steel products, such as hexagonal steel, square steel, flat steel and the like can be directly produced through a
caliber system.