To obtain a long sheet bar without joining the sheet bars and slabs by applying a plate thickness pressing while using one pair of dies provided with the inclining parts at the inlet side and the flat parts at the outlet side at least at a part of rough working and heating the front tip part of the material in a rough-rolling and a finish- rolling succeeded to this plate thickness pressing.
A continuously cast slab 20 continuously casting in a continuous caster 1, is heated in target temp. range in a heating furnace 3 and introduced into the rougher rolling equipment 2 through a heat holding device 9 and the plate thickness pressing is applied with one pair of dies 6 provided with the inclining parts 6b at the inlet side and the flat parts 6a at the outlet side in the plate thickness pressing apparatus and further, the rough-rolling is executed with a rough rolling mill 7 to form the sheet bar 20A. The long sheet bar 20A is introduced into a finish rolling mill 3 after adjusting the temp. in a heat holding device 11 and a heating device 12 to form a steel strip, and the steel strip is coiled through a cutter 4. Therein, the front tip part of the material is heated at the front of or on the way of the finish rolling mill 3 or at the front of the rougher rolling mill 7, etc.
MASUDA SADAKAZU
NISHII TAKASHI
ISHII HAJIME
IDE KENICHI
OSADA SHIRO
ISHIKAWAJIMA HARIMA HEAVY IND