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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 11634787 B1

PDFFull Text
Date of Patent:
Apr. 25, 2023

Filed:

Jan. 08, 2020

Grain-oriented electrical steel sheet, annealing separator, and method for manufacturing grain-oriented electrical steel sheet

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Ryutaro Yamagata, Tokyo, JP;

Nobusato Morishige, Tokyo, JP;

Ichiro Tanaka, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Humera N Sheikh

Assistant Examiner:

Kevin C T Li

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/60 (2006.01); C22C 38/16 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 8/12 (2006.01); C21D 8/00 (2006.01); C21D 6/00 (2006.01); C21D 3/04 (2006.01); H01F 1/147 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 3/04 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/1233 (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 38/16 (2013.01); C22C 38/60 (2013.01); H01F 1/14766 (2013.01);
Abstract

Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of a primary coating to a base steel sheet, an annealing separator utilized for manufacture of grain-oriented electrical steel sheet, and a method for manufacturing grain-oriented electrical steel sheet are proposed. The grain-oriented electrical steel sheet is provided with a base metal steel sheet containing comprising a predetermined chemical composition and a primary coating formed on a surface of the base steel sheet and comprising MgSiOas a main constituent. The primary coating satisfies the conditions of (1) the number density D3 of the Al concentrated region: 0.020 to 0.180/μm, (2) (total area S5 of regions which is anchoring oxide layer regions and is also Al concentrated regions)/(total area S3 of Al concentrated regions)≥33%, (3) distance H5 of mean value of length in thickness direction of regions which is anchoring oxide layer regions and is also Al concentrated regions minus H0: 0.4 to 4.0 μm, (4) (total area S1 of anchoring oxide layer regions)/(observed area S0)≥15%.

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