Abstract: In order to save energy and improve efficiency during hot rolling automobile steel sheet,Handan Company,HBIS Group carried out the industry trial production of ferrite rolling of ultra-low carbon IF steel relying on a production line of 2250 hot continuous rolling.The microstructure,mechanical properties of hot coiled strip,microstructure,mechanical properties and texture of the continuous annealing products were compared and analyzed.The results show that the microstructure of hot strip steel under ferrite rolling did not recrystallize,and the microstructure of hot strip under austenite rolling is composed of typical recrystallized polygonal ferrite.The yield strength R_p0.2 and tensile strength R_m of DC06 steel under ferrite rolling are higher than those of austenite rolling,and the fluctuation range is larger,and the elongation after fracture is reduced by about 10%.The microstructure of DC06 of ferrite rolling process is uniform,and the grain size is finer than that of austenite rolling,and its plastic strain ratio is relatively low and anisotropy is more obvious.The {111} texture of strip under austenite rolling process is stronger than that of ferrite rolling process,which is more favorable for stamping forming.