GRAIN-ORIENTED MAGNETIC STEEL SHEET AND PROCESS FOR PRODUCING SAME

摘要

A grain-oriented magnetic steel sheet having linear grooves for magnetic domain refinement which have been formed in a surface of the steel sheet is produced in accordance with the present invention so that the proportion of linear grooves under which crystal grains having a deviation in orientation from the Goss orientation of 10º or more and having a grain diameter of 5 µm or more are present is regulated to 20% or less, and that the crystal grains formed by secondary recrystallization are regulated so as to have an average ß angle of 2.0º or less and the crystal grains formed by secondary recrystallization which have a grain diameter of 10 mm or more are regulated so as to have an average width of ß-angle fluctuations of 1-4º. Due to the formation of the linear grooves for magnetic domain refinement, a grain-oriented magnetic steel sheet reduced in iron loss can be obtained.