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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 10643770 B1

PDFFull Text
Date of Patent:
May. 05, 2020

Filed:

Dec. 11, 2013

Grain-oriented electrical steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Takeshi Imamura, Kurashiki, JP;

Yukihiro Shingaki, Kurashiki, JP;

Ryuichi Suehiro, Kurashiki, JP;

Toshito Takamiya, Kurashiki, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Nicholas A Wang

Int. Cl.
CPC ...
C21D 8/12 (2006.01); H01F 1/147 (2006.01); C22C 38/40 (2006.01); C22C 38/16 (2006.01); C22C 38/02 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/20 (2006.01); C22C 38/34 (2006.01);
U.S. Cl.
CPC ...
H01F 1/14775 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/20 (2013.01); C22C 38/34 (2013.01); C22C 38/40 (2013.01); C22C 38/60 (2013.01); H01F 1/16 (2013.01); C21D 8/12 (2013.01); C21D 2201/05 (2013.01); Y02P 10/212 (2015.11);
Abstract

When a steel sheet containing Si: 2-5 mass % after cold rolling is subjected to a primary recrystallization annealing and a finishing annealing for secondary recrystallization to form a grain-oriented electrical steel sheet, the primary recrystallization annealing is performed by rapid heating in the heating process and temperature keeping treatment at a certain temperature in the course of the heating to thereby obtain a grain-oriented electrical steel sheet having plural peaks in a distribution of misorientation angle between crystal orientation of secondary recrystallized grains and Goss orientation, wherein misorientation angle of the second smallest peak among the plural peaks is preferably not less than 5° and a grain size of secondary recrystallized grains is not more than 15 mm.

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