The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2026
Filed:
Jun. 23, 2021
Nippon Steel Corporation, Tokyo, JP;
Takashi Kataoka, Tokyo, JP;
Haruhiko Atsumi, Tokyo, JP;
Ryutaro Yamagata, Tokyo, JP;
Nobusato Morishige, Tokyo, JP;
Kazutoshi Takeda, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
Provided is a production method for a grain-oriented electrical steel sheet that is thin and has excellent magnetic characteristics. An embodiment of the present invention provides a production method that is for a grain-oriented electrical steel sheet and that comprises: a hot rolling step; an optional hot-rolled sheet-annealing step; an acid-washing step; a cold rolling step; a primary recrystallization-annealing step; a finishing-annealing step; and a planarization-annealing step. In the acid-washing step, an acid-washing solution containing 0.0001-5.00 g/L of Cu is used. The thickness of a cold-rolled steel sheet is 0.15-0.23 mm. The average temperature increase rate in the temperature range of 30-400° C. in a temperature increase process in the primary recrystallization step is more than 50° C./sec but not more than 1000° C./sec.