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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 9978489 B1

PDFFull Text
Date of Patent:
May. 22, 2018

Filed:

Sep. 25, 2014

Method of producing grain oriented electrical steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Masanori Takenaka, Tokyo, JP;

Takeshi Imamura, Tokyo, JP;

Yasuyuki Hayakawa, Tokyo, JP;

Yukihiro Shingaki, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C21D 8/12 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); H01F 1/16 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/60 (2006.01); C21D 1/34 (2006.01); C21D 6/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/34 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C23C 8/26 (2006.01);
U.S. Cl.
CPC ...
H01F 1/16 (2013.01); C21D 1/34 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C21D 8/1261 (2013.01); C21D 8/1272 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/34 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/60 (2013.01); C23C 8/26 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 2201/05 (2013.01);
Abstract

Provides is a method of producing a grain oriented electrical steel sheet by heating a steel slab having a predetermined composition, then subjecting the slab to hot rolling to obtain a hot rolled sheet, then optionally subjecting the hot rolled sheet to hot band annealing and subsequent cold rolling once, or twice or more with intermediate annealing performed therebetween to obtain a cold rolled sheet with final sheet thickness, then subjecting the cold rolled sheet to primary recrystallization annealing and subsequent secondary recrystallization annealing, in which the aging index AI of the steel sheet before final cold rolling is set to 70 MPa or less to effectively grow Goss-oriented grains to thereby obtain a grain-oriented electrical steel sheet with good magnetic properties, without the restriction of containing a relatively large amount of C.

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