Grain-oriented electrical steel sheet with insulating film and method for manufacturing the same

A grain-oriented electrical steel sheet with an insulating film, the steel sheet comprising a base film composed mainly of forsterite on a surface of a grain-oriented electrical steel sheet and an insulating film containing mainly silicate-phosphate glass which is formed on a surface of the base film, wherein

• at least one of condition 1, condition 2, and condition 3 below is satisfied, and relational expressions Sr(B)≥Sr(A)≥0, Ca(B)≥Ca(A)≥0, and Ba(B)≥Ba(A)≥0 are satisfied,
• where a thickness of the insulating film is defined as N and a thickness of the base film is defined as M,
• where, in a thickness direction from a surface of the insulating film, a position of the surface of the insulating film is defined as x(0), a central position of the thickness of the insulating film is defined as x(N/2), a position of an interface between the insulating film and the base film is defined as x(N), and a central position of the thickness of the base film is defined as x(N+M/2),
• where maximum values of a Sr concentration, a Ca concentration, and a Ba concentration in a region from the position x(0) to the position x(N/2) are defined as Sr(A), Ca(A), and Ba(A), respectively, and a Sr concentration, a Ca concentration, and a Ba concentration at the position x(N) are defined as Sr(B), Ca(B), and Ba(B), respectively, and
• where maximum values of a Sr concentration, a Ca concentration, and a Ba concentration in a thickness region formed by combining the insulating film and the base film are defined as Sr(C), Ca(C), and Ba(C), respectively, and positions at which the values Sr(C), Ca(C), and Ba(C) are taken are defined as x(Sr(C)), x(Ca(C)), and x(Ba(C)), respectively:
• x(N/2)<x(Sr(C))≤x(N+M/2) and Sr(C)>Sr(B) [Condition 1]
• x(N/2)<x(Ca(C))≤x(N+M/2) and Ca(C)>Ca(B) [Condition 2]
• x(N/2)<x(Ba(C))≤x(N+M/2) and Ba(C)>Ba(B) [Condition 3].