METHOD FOR CONTROLLING WIDTH OF STEEL SHEET IN HOT ROLLING

摘要

PURPOSE:To remarkably reduce the deviation between the product width and the target width of a steel sheet. CONSTITUTION:The finish rolling of the steel sheet 7 is completed at a temp. higher than a transformation temp. Ar3 and the width of the steel sheet 7 just after the position of the transformation temp. Ar3 of the steel sheet 7, which is predetermined for every product size and for every kind of steel, on a hot run table is measured. The deviation between the measured value of width of the steel sheet 7 which is measured in this manner and the target width is calculated and the tension so that the deviation is made zero based on the relationship between the tension to be imparted to the steel sheet 7 and the amount of shrinkage of width that is predetermined for every product size and for every kind of steel is imparted to the steel sheet 7 between a coiler 12 and a finishing mill 10.