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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 11572602 B1

PDFFull Text
Date of Patent:
Feb. 07, 2023

Filed:

Jun. 17, 2021

Method for manufacturing a grain-oriented electrical steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Takeshi Omura, Tokyo, JP;

Hirotaka Inoue, Tokyo, JP;

Seiji Okabe, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Humera N Sheikh

Assistant Examiner:

Kevin C T Li

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/60 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/44 (2006.01); G01R 33/18 (2006.01); H01F 1/18 (2006.01); C23C 22/74 (2006.01); G01H 9/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C23C 22/38 (2006.01); C21D 3/04 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C23C 22/08 (2006.01); H01F 10/08 (2006.01); H01F 27/33 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 3/04 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/125 (2013.01); C21D 8/1255 (2013.01); C21D 8/1261 (2013.01); C21D 8/1283 (2013.01); C21D 8/1288 (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 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/60 (2013.01); C23C 22/08 (2013.01); C23C 22/38 (2013.01); C23C 22/74 (2013.01); G01H 9/00 (2013.01); G01R 33/18 (2013.01); H01F 1/18 (2013.01); H01F 10/08 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); H01F 27/33 (2013.01);
Abstract

Provided is a method for manufacturing a grain-oriented electrical steel sheet. The method comprises: hot rolling a slab to obtain a hot rolled sheet; subjecting the hot rolled sheet to hot band annealing as necessary; subjecting the hot rolled sheet to cold rolling; subjecting the cold rolled sheet to decarburization annealing; applying an annealing separator having MgO as a main component onto a surface of the decarburization annealed sheet and subjecting the decarburization annealed sheet to final annealing to form the forsterite film; and applying an insulating coating treatment liquid onto the final annealed sheet and subjecting the final annealed sheet to flattening annealing to form a tension-applying insulating coating. A difference in total tensions between one and opposite surfaces of the sheet is less than 0.5 MPa. A difference in tensions between the forsterite films in one and opposite surfaces of the sheet is 0.5 MPa or more.

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