METHOD FOR HOT ROLLING GRAIN ORIENTED ELECTRICAL STEEL SHEET

摘要

PURPOSE:To prevent edge cracking from being caused in the width direction which is caused at the time of hot rolling after heating a grain oriented electrical steel slab at high temp. in a heating furnace. CONSTITUTION:To a rolling mill group which is composed of a vertical rolling mill 1 for rolling in the width direction of a steel material 2 and a horizontal rolling mill for rolling in the thickness direction, leveling action by which the difference in rolling force at both edges is made zero and correcting action of the gap between both sides of the vertical rolling mill 1 with which the average rolling force at both the edges is tan as the objective rolling force are combined to impart a fixed amount of rolling force to both the edges in the width direction of the steel material 2. In this way, the average depth of edge cracking in the width direction is reduced from 40mm to 15mm in the grain oriented electrical steel sheet.