Patent ID: 8268097

Claim:
A grain-oriented electrical steel sheet comprising a film on an outermost surface of a steel sheet, wherein the film comprises a phosphate, a silica, a manganese compound, and a potassium compound, wherein the phosphate includes one or more metals selected from the group consisting of Al, Mg, Ni, Mn, Co, Mo, Zr, Sr, and Ca, wherein relative amounts of the phosphate, the silica, and the manganese compound in the film are 100 parts by mass of the phosphate expressed as a solid material, 20 to 80 parts by mass of the silica expressed as a solid material, and 0.5 to 15 parts by mass of the manganese compound other than the phosphate expressed as a manganese dioxide, and wherein a mole ratio K/Mn of potassium to manganese is 0.02 to 2.0.