GRAIN-ORIENTED MAGNETIC STEEL SHEET.

摘要

Provided is a grain-oriented magnetic steel sheet having excellent noise characteristics which includes a material having grooves for magnetic-domain refinement. When used to assemble a real transformer, the steel sheet can inhibit the transformer from generating a noise. The grain-oriented magnetic steel sheet comprises a steel sheet having grooves for magnetic-domain refinement in the front or back surface thereof and is equipped with a forsterite coating film and a tension coating on each of the front and back surfaces. When the amount of the tension coating adhered to the surface having the grooves is expressed by A (g/m²) and the amount of the tension coating adhered to the surface not having the grooves is expressed by B (g/m²), these amounts (A) and (B) are regulated to given ranges.