Method of manufacturing slab directly provided from continuous casting process into hot-rolled steel sheets with high ductility

摘要

The invention of the steps and, a tandem type and subjected to rough rolling and the step of preparing a slab of a play just after the carbon content and containing a carbonitride-forming elements of less than 0.010wt%, the cast steel above 910 ℃ to produce a strip the step of finish-rolling the strip with a finishing mill and; And finish as the rolled strip made of a phase winding in a temperature range of 650 ℃ ~730 ℃ relates to a process for the preparation of the flexible hot rolled steel sheet maintained at the inlet of the finish rolling mill to less than 900 ℃ the surface temperature of the strip and the finished by keeping the outlet temperature of the mill to 750 ℃ ​​~850 ℃, the finish rolling step is so characterized by such embodiment in the ferrite station, quality degradation is eopeumyeonseo (microstructure and above) also, excellent elongation characteristics in the width direction edge portions and having has an effect capable of manufacturing a flexible hot rolled steel sheet.