METHOD OF MANUFACTURING LOW-CORE-LOSS GRAIN ORIENTED ELECTRICAL STEEL SHEET

摘要

A method of manufacturing a low-core-loss grain oriented electrical steel sheet. Thread-like grooves are formed in a cold-rolled grain oriented electrical steel sheet having a final thickness of about 0.27 mm or less in a direction within the range of about 30.degree. from the direction perpendicular to the rolling direction. The grooves and sheet satisfy the equation log d where d is the groove depth (.mu.m), and Ra is the mean surface roughness of the steel sheet cold-rolled to final gauge. The steel sheet is thereafter decarburization annealed and final texture annealed.