Patent ID: 6228182
Filing Date: 2001-05-08
Classification: C21D,C23C,H01F

Abstract:
A method of producing a low iron loss grain-oriented electromagnetic steel sheet comprising the steps of:hot rolling an electromagnetic steel;cold rolling the hot rolled steel sheet once, or at least two times including intermediate annealing and forming a cold rolled sheet;annealing the cold rolled steel sheet for decarburization;after cold rolling and before finish annealing, forming linear grooves in the steel sheet without applying non-uniform stress to the steel sheet by a method selected from the group consisting of electrochemical and chemical;filling said linear grooves with an element or compound of said element, said element being selected from the group consisting of Sn, B and Sb; andpromoting formation of fine grains in said steel sheet without disturbing orientation of secondary recrystallized grains in said steel sheet during finish-annealing of the steel sheet.