| 摘要 |
A grain oriented electrical steel sheet is provided where thickness of forsterite film at bottom portions of grooves formed on a surface of the steel sheet is ‰¥ 0.3 µm, groove frequency is ‰¤ 20%, which is abundance ratio of grooves crystal grains directly beneath themselves, each crystal grain having orientation deviating from Goss orientation by ‰¥ 10° and grain size ‰¥ 5 µm, total tension exerted on the steel sheet in rolling direction by forsterite film and tension coating is ‰¥ 10.0 MPa, total tension exerted on the steel sheet in direction perpendicular to rolling direction by forsterite film and tension coating is ‰¥ 5.0 MPa and the total tensions satisfy
where
A is total tension exerted in rolling direction by forsterite film and tension coating, and
B is total tension exerted in direction perpendicular to rolling direction by forsterite film and tension coating. |
