| 摘要 |
<p>According to the present invention, when irradiating a surface of a grain-oriented electrical steel sheet having a plate thickness of t with an electron beam in the direction intersecting the rolling direction, a value of irradiation energy Ewmin(0.23) at which iron loss of a material having a plate thickness of 0.23 mm is at a minimum is used to adjust the irradiation energy E(t) of an electron beam such that formula (1) is satisfied (Formula (1): Ewmin(0.23) x (1.61-2.83 x t(mm)) ≤ E(t) ≤ Ewmin(0.23) x (1.78-3.12 x t(mm))). As a result, a grain-oriented electrical steel sheet can be achieved, with which reductions in productivity due to optical system adjustment operations and line spacing shortening can be inhibited, and high productivity can be attained.</p> |
