| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a method for producing a grain-oriented electrical steel sheet having no forsterite coating with which in the case of using magnesia adding halide as a separating agent for annealing, the development of fine surface defect feared at finish-annealing time, is effectively prevented and thus, the increase of a core loss is not brought about. <P>SOLUTION: Hydraulic slurry in the separating agent for annealing mainly containing the magnesia adding the halide at 0.1-10 parts of weight with the conversion into halogen elements to 100 parts of weight of the magnesia, is coated on the steel sheet after primary recrystallize-annealing. Successively, when the grain-oriented electrical steel sheet having no forsterite coating is produced after applying the finish-annealing, this steel sheet is heated and dried to in the temperature range of 270-400°C within 30 sec after coating the hydraulic slurry in the separating agent for annealing on the steel sheet. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
