METHOD OF MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET EXHIBITING LOW IRON LOSS

摘要

According to the present invention, when irradiating the surface of a grain-oriented electrical steel sheet having a sheet thickness t with an electron beam in a direction intersecting a rolling direction, the irradiation energy E(t) of the electron beam is adjusted to satisfy Ewmin(0.23) × (1.61 - 2.83 × t (mm)) ‰¤ E(t) ‰¤ Ewmin(0.23) × (1.78 - 3.12 × t (mm)) (Expression (1)) using the value of the irradiation energy Ewmin(0.23) that minimizes iron loss for material with a sheet thickness of 0.23 mm. The present invention thus allows for a grain-oriented electrical steel sheet with high productivity that can suppress a reduction in productivity caused by optical system adjustment operations or by shortening of line spacing.