METHOD FOR MANUFACTURING ORIENTED ELECTROMAGNETIC STEEL SHEET

Japanese Patent JP2014194073

A

PROBLEM TO BE SOLVED: To provide a method for manufacturing an oriented electromagnetic steel sheet having low iron loss.SOLUTION: In a method for manufacturing an oriented electromagnetic steel sheet that comprises a series of processes including hot rolling of a steel raw material containing C:0.002 to 0.10 mass%, Si:2.0 to 8.0 mass% and Mn:0.005 to 1.0 mass%, hot rolled sheet firing if needed, cold rolling, primary recycling firing or primary recycling firing with decarbonization, and then finish firing, and a magnetic domain fragmentation treatment in any process after the cold rolling, a retention treatment for retaining any temperature from 250 to 600°C for t (sec.) when conducting a rapid heating at 50°C/s or more in a range of 200 to 700°C in a heating process of the primary recycling firing is conducted, and the magnetic domain fragmentation treatment is conducted so that a space W (mm) in a rolling direction of a strain part or a groove part attached to a surface of the steel sheet satisfies the following formula: -t+3