UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET HAVING EXCELLENT FILM ADHESION, AND METHOD FOR MANUFACTURING THE SAME

摘要

Grain-oriented electrical steel sheet excellent in coating adhesion is provided. The steel sheet contains Si: 2 to 7% mass% and has a primary coating composed mainly of forsterite on its surface. A compound (A) containing one or more elements selected from among Ca, Sr and Ba, at least one rare earth metal, and sulfur is incorporated in the primary coating so as to reside in the interface layer between the primary coating and the steel sheet. As a result, occurrence of primary coating exfoliation at regions that are strongly worked during manufacture of a wound core transformer or the like is prevented.