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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 11577291 B1

PDFFull Text
Date of Patent:
Feb. 14, 2023

Filed:

Oct. 18, 2017

Hot-rolled steel sheet for electrical steel sheet production and method of producing same

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yuiko Ehashi, Tokyo, JP;

Masanori Takenaka, Tokyo, JP;

Takeshi Imamura, Tokyo, JP;

Minoru Takashima, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Paul A Wartalowicz

Assistant Examiner:

Stephani Hill

Int. Cl.
CPC ...
B21B 45/08 (2006.01); C21D 6/00 (2006.01); C22C 38/40 (2006.01); C22C 38/34 (2006.01); C22C 38/16 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/00 (2006.01); C21D 9/46 (2006.01); C21D 8/12 (2006.01); C22C 38/60 (2006.01); C22C 38/02 (2006.01); C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
B21B 45/08 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/12 (2013.01); C21D 8/1222 (2013.01); C21D 9/46 (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 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/34 (2013.01); C22C 38/40 (2013.01); C22C 38/60 (2013.01);
Abstract

With a hot-rolled steel sheet for electrical steel sheet production having a scale layer on the surface, where the surface of the steel sheet has a lightness L* as defined in JIS Z 8781-4: 2013 satisfying 30≤L*≤50, and chromaticities a* and b* as defined in JIS Z 8781-4: 2013 satisfying −1≤a*≤2 and −5≤b*≤3 respectively, and with one end portion in the longitudinal direction of a coil as a reference, a color difference ΔE* as defined in JIS Z 8781-4: 2013 at the central portion and at the opposite end portion satisfies ΔE*≤8, it is possible to obtain a grain-oriented electrical steel sheet where the variation of properties in a product coil is small.

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