abstract |
(57) [Problem] To provide a method for manufacturing a grain-oriented electrical steel sheet having extremely small iron loss by forming an insulating film firmly adhered to an electromagnetic steel sheet having a magnetically smooth surface. There is no forsterite finish annealing film, A coating liquid containing phosphate, free phosphoric acid, colloidal silica, and an organic metal compound having a hydrophilic group or an organic bonding group and a metal bonding group is applied to a magnetically smooth grain-oriented electrical steel sheet and baked. To form an insulating film. |