| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a core-loss in a grain-oriented electrical steel sheet which contains Al and generates a high density of magnetic flux, by a method of increasing a strength of Goss in a primary recrystallization texture. <P>SOLUTION: In a process of manufacturing a grain-oriented electrical steel sheet by annealing a hot-rolled steel plate containing, by mass%, 0.040 to 0.085% C, 2.8 to 4.0% Si, and 0.022 to 0.035% acid-soluble Al, annealing the plate once or more times before a final cold rolling step, and making AlN be a main grain growth inhibitor, this method for manufacturing the grain-oriented electrical steel sheet includes: controlling a reduction rate to 80 to 93% in the final cold rolling step; final-cold-rolling the plate in one or more passes at 150°C or higher; and setting a period of time between the end of the final cold rolling and the start of primary recrystallization-decarburization annealing to 24 hours or less. <P>COPYRIGHT: (C)2010,JPO&INPIT |
