| abstract |
Disclosed is an electromagnetic steel sheet which has a semi-organic insulating coating film that is composed of an inorganic component and an organic resin. The semi-organic insulating coating film contains, as the inorganic component, a Zr compound, a B compound and an Si compound. Specifically, when expressed as the ratios in a dry coating film, 20-70% by mass of the Zr compound (in terms of ZrO2), 0.1-5% by mass of the B compound (in terms of B2O3) and 10-50% by mass of the Si compound (in terms of SiO2) are contained with the balance made up of the organic resin. Consequently, the electromagnetic steel sheet with a semi-organic insulating coating film does not deteriorate in corrosion resistance and water resistance even if no chromium compound is contained therein. The electromagnetic steel sheet with a semi-organic insulating coating film exhibits excellent powdering resistance, scratch resistance, sticking properties, TIG weldability and punchability, and has excellent appearance after stress relieving annealing. |