METHOD FOR MANUFACTURING HOT-ROLLED STEEL STRIP HAVING REDUCED EDGE SEAM

PROBLEM TO BE SOLVED: To stabilize an amount of an edge seam movement in a material to be rolled of a similar standard and reduce an edge seam while reducing a surplus width. SOLUTION: A slab side face shape measurement (a slab 1 side face is scanned with slit light in parallel with a slab width direction and it is carried out using an image obtained by photographing a slit video image on a slab side face through catching the reflective light) by an optical means at halfway of width press or before start of rolling after the width press is performed so that deviation C in a slab thickness direction of a slab hammering position by a width press die 4 is calculated. Based on the deviation, width press is carried out by alignment in a vertical direction of a center of a slab side face and the center of the width press die by allowing a succeeding slab of the similar standard that is subjected to the width press after the slab to be a target. COPYRIGHT: (C)2011,JPO&INPIT