Patent ID: 8936687
Filing Date: 2015-01-20
Classification: B21B,C21D,C22C,H01F

Abstract:
1. A method for manufacturing grain oriented electrical steel sheets, comprising a series of steps in which a steel slab containing: C at 0.01 to 0.10 mass %, Si at 2.5 to 4.5 mass %, Mn at 0.02 to 0.12 mass %, Al at 0.005 to 0.10 mass %, N at 0.004 to 0.015 mass %, and one or more components selected from Se at 0.005 to 0.06 mass % and S at 0.005 to 0.06 mass %, the steps including: wherein the temperature of the steel sheet is controlled so as to satisfy Equation (1) below throughout an entire length of a coil formed by the steel sheet during cooling of the steel sheet after the completion of the hot rolling in step (b), and the temperature of a tip portion of the coil representing 10% of the length of the coil, where a deviation of sheet thickness is greater than ±5%, is controlled so as to be not less than 650° C. at a lapse of 3 seconds from the completion of the hot rolling in step (b): wherein T (t): steel sheet temperature (° C.), FDT: finishing temperature (° C.) and t: time (sec) after the completion of finish rolling.