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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.:

US 9175362 B1

PDFFull Text
Date of Patent:
Nov. 03, 2015

Filed:

Feb. 18, 2011

Method of manufacturing grain-oriented electrical steel sheet

Applicants:

Kenichi Murakami, Tokyo, JP;

Yoshiyuki Ushigami, Tokyo, JP;

Inventors:

Kenichi Murakami, Tokyo, JP;

Yoshiyuki Ushigami, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Kenyon & Kenyon LLP

Primary Examiner:

Roy King

Assistant Examiner:

Caitlin Kiechle

Int. Cl.
CPC ...
C21D 8/12 (2006.01); C21D 3/04 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C23C 8/02 (2006.01); C23C 8/80 (2006.01); H01F 1/16 (2006.01); C22C 38/02 (2006.01); C22C 33/04 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C23C 8/00 (2006.01); C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
C21D 8/12 (2013.01); C21D 3/04 (2013.01); C21D 9/46 (2013.01); C22C 33/04 (2013.01); C22C 38/001 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/34 (2013.01); C23C 8/02 (2013.01); C23C 8/80 (2013.01); H01F 1/16 (2013.01);
Abstract

Hot rolling is performed on a steel with a predetermined composition containing Ti: 0.0020 mass % to 0.010 mass % and/or Cu: 0.010 mass % to 0.50 mass % to obtain a hot-rolled steel sheet. Annealing is performed on the hot-rolled steel sheet to obtain an annealed steel sheet. Cold rolling is performed on the annealed steel sheet to obtain a cold-rolled steel sheet. Decarburization annealing and nitridation annealing are performed on the cold-rolled steel sheet to obtain a decarburized nitrided steel sheet. Then, finish annealing is performed on the decarburized nitrided steel sheet. When obtaining the decarburized nitrided steel sheet, heating on the cold-rolled steel sheet is started in a decarburizing and nitriding atmosphere, then first annealing is performed at a first temperature within a predetermined range, and then second annealing is performed at a second temperature within a predetermined range.

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