| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce an edge crack occurring at the time of the hot rolling of a grain oriented electrical steel sheet. SOLUTION: After heating a slab for a grain oriented electrical steel sheet, when attaining a hot rolled coil by performing hot rough rolling and then hot finish rolling, for a sheet bar after the hot rough rolling, with respect to the relationship of the thickness te (mm) of the side edge part of this sheet bar and the thickness tc (mm) of the center part in the width direction of the sheet bar, it must be a shape satisfying a following inequality, te-ec>=1(mm). Concretely, proper width drawing down is performed at the time of the rough rolling. |
