| 摘要 |
In a method for manufacturing grain oriented electrical steel sheets containing, in terms of mass%, C at 0.01 to 0.10%, Si at 2.5 to 4.5%, Mn at 0.02 to 0.12%, Al at 0.005 to 0.10% and N at 0.004 to 0.015%, as well as one or two selected from Se at 0.005 to 0.06% and S at 0.005 to 0.06%, the steel sheet temperature is controlled so as to satisfy T (t) < FDT - (FDT - 700) x t/6 (wherein T (t): steel sheet temperature (°C), FDT: finishing temperature (°C) and t: time (sec) after the completion of finish rolling) throughout the entire length of a coil during cooling after the completion of finish rolling in hot rolling, and further the steel sheet temperature of a tip portion of the coil representing 10% of the length of the coil is controlled to be not less than 650°C at a lapse of 3 seconds from the completion of hot rolling, thus manufacturing a grain oriented electrical steel sheet exhibiting excellent magnetic properties throughout the entire coil length. |
