METHOD FOR HOT ROLLING HIGH TENSILE STRENGTH STRIP HAVING LESS WIDTHWISE THICKNESS DEVIATION

摘要

PURPOSE: A hot rolling method for reducing edge drop by forming dog bone in the rough rolling process and finish rolling rough rolled bar so that the dog bone is utilized for compensating thickness of an edge part of strip. CONSTITUTION: In a hot rolling method comprising rough rolling and finish rolling consisting of widthwise rolling and thicknesswise rolling, the method for hot rolling high tensile strength strip having less widthwise thickness deviation comprises a step of obtaining a rough rolled bar on which dog bone is formed by performing dummy rolling in the final thicknesswise rolling after performing the final widthwise rolling a slab for high tensile strength strip in the rough rolling; and a step of finish rolling the dog bone formed rough rolled bar so that thickness of the edge part is compensated by the dog bone, wherein finish rolling rolls having minus crown are used in the finish rolling, and wherein the dog bone formed on the rough rolled bar has a size of 5.46 mm or less.