METHOD AND DEVICE FOR CONTROLLING FLATNESS OF METALLIC SHEET

摘要

PROBLEM TO BE SOLVED: To provide a control method and device for preventing the generation of waves on a steel sheet, which are generated in the edge parts in the width direction of a metallic sheet when the temperature of the steel sheet becomes normal temperature through cooling process after completing hot rolling. SOLUTION: In this control method of the flatness of the metallic sheet, the surface temperature of a metallic strip is measured between finishing mills of a tandem mill or on the outlet side of the finishing mill and the metallic strip is cooled from the upper part and/or the lower part over the whole mill so that temperature difference is made in the surface temperature having low- temperature part at the part other than edge parts in the width direction.