| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation of effect of a step press in a case the width of a slab on an output side of the press device is not a predetermined value.SOLUTION: A plate width control device 10 used for a hot rough rolling step in which a slab that is heated by reducing an edging amount at a tip end part than that at a steady part by utilizing a press device 2 is edged, and then, by utilizing a rough rolling mill 3a and an edger 5a, a slab S is subjected to rough rolling in vertical direction and horizontal direction. It includes a press output side width gauge 12 for measuring a width of a tip end part of the slab S at an output side of the press device 2, and an open degree control device 14 which controls open degree of the edger 5a at a first pass in rough rolling based on the width at the tip end part of the slab S that is measured. |
