UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET HAVING EXCELLENT FILM ADHESION, AND MET

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This invention provides a unidirectionally grain oriented electromagnetic steel sheet comprising, by mass, 2 to 7%% of Si and having a primary film composed mainly of forsterite on its surface. The primary film comprises at least one element selected from Ca, Sr and Ba, a rare earth metal element, and a sulfur-containing compound (A). According to the above constitution, the compound (A) is present in the interface layer between the primary film and the steel sheet. As a result, in the manufacture of a wound core transformer or the like, the separation of a primary film caused in a highly bending part can be prevented.© KIPO & WIPO 2009