Method for producing non-oriented electrical steel sheet

Abstract

A method for producing a non-oriented electrical steel sheet by hot rolling a steel slab containing C: not more than 0.0050%, Si: not more than 5.0%, Mn: not more than 3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3.0%, Cr: not more than 5.0%, Ti: not more than 0.005%, and subjecting the sheet to a cold rolling and a finish annealing, wherein the heating in the finish annealing is conducted in two stages of performing an induction heating and subsequently a radiation heating and the induction heating is conducted up to not lower than 720° C. at an average heating rate of not less than 50° C. / sec between 600° C. and 700° C. and a time from the end of the induction heating to the start of the radiation heating is not more than 8 seconds.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is the U.S. National Phase application of PCT / JP2016 / 080072, filed Oct. 11, 2016, which claims priority to Japanese Patent Application No. 2015-240390, filed Dec. 9, 2015, the disclosures of these applications being incorporated herein by reference in their entireties for all purposes.TECHNICAL FIELD OF THE INVENTION[0002]This invention relates to a method for producing a non-oriented electrical steel sheet, and more particularly to a method for producing a non-oriented electrical steel sheet having a high magnetic flux density.BACKGROUND OF THE INVENTION[0003]In recent years, energy saving has been promoted from a viewpoint of global environment protection, and higher efficiency and downsizing are also directed in the field of electric instruments. As a result, non-oriented electrical steel sheets widely used as an iron core material for the electric instruments are strongly demanded to have a high magnetic flux density and a low ir...

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