| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for stably producing a grain-oriented electrical steel sheet having extremely high magnetic flux density in an industrial scale. <P>SOLUTION: The method for producing the grain-oriented electrical steel sheet uses as material a slab composed of 0.02-0.10% C, 2.5-4.5% Si, 0.01-0.15% Mn, 0.001-0.050% S, 0.01-0.05% acid-soluble Al, 0.002-0.015% N, 0.0005-0.1000% Te. The method includes a series of processes: hot-rolling the above slab then applying a hot-rolled sheet annealing to the hot-rolled steel sheet; obtaining cold-rolled steel sheet by applying cold-rolling one time or two or more times with a process annealing interposed therebetween; then applying decarburization-annealing to the cold-rolled steel sheet and coating the cold-rolled steel sheet with an annealing separator; then applying finish-annealing to the steel sheet. In the method, just before the decarburization annealing or in the temperature raising process for decarburization annealing, the heating treatment to the temperature of ≥800°C at ≥50°C/sec heating speed, is performed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
