GRAIN-ORIENTED SILICON STEEL SHEET HAVING A LOW IRON LOSS FREE FROM DETERIORATION DUE TO STRESS-RELIEF ANNEALING AND A METHOD OF PRODUCING THE SAME

摘要

A grain-oriented silicon steel sheet having a low iron loss free from deterioration due to the stress-relief annealing, can be obtained by forming on its surface a forsterite film locally having regions, which have a thickness different from that of the remaining regions in the film, or locally having filmless regions which do not coat the steel sheet surface.