GRAIN-ORIENTED ELECTRICAL STEEL SHEET FOR IRON CORE AND METHOD OF MANUFACTURING THE SAME

摘要

According to the present invention, 150 MPa or greater residual stress is made to be present in a range within 300 µm in the direction of rolling and in a range of 42 µm or greater in the direction of sheet thickness in the vicinity of a strain region and strain regions are formed periodically at intervals of 2 - 10 mm in the direction of rolling, thereby achieving superior transformers steel loss in a 1.5 - 1.9 T excitation region. Thus, a grain-oriented electrical steel sheet for an iron core with little energy loss during transformer operation can be obtained.