ELECTROMAGNETIC STEEL SHEET HAVING INSULATING COATING FILM ATTACHED THERETO

摘要

An electrical steel sheet provided with insulating coating excellent in punchability and adhesion property is obtained. The electrical steel sheet provided with insulating coating comprises an electrical steel sheet and an insulating coating formed on the electrical steel sheet. The insulating coating contains Si and Fe. The coating weight of Si in the insulating coating in terms of SiO 2 is 50% to 99% of the total coating weight. The ratio (Fe/Si) of the content of Fe to the content of Si in the insulating coating ranges from 0.01 to 0.6 on a molar basis. The insulating coating preferably contains an organic resin and/or a lubricant. In the insulating coating, the ratio (C (the organic resin + the lubricant)/(Fe 2 O 3 + SiO 2 )) of the coating weight of the organic resin and/or the lubricant in terms of C to the sum of the coating weight of Fe in terms of Fe 2 O 3 and the coating weight of Si in terms of SiO 2 preferably ranges from 0.05 to 0.8.