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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 10428403 B1

PDFFull Text
Date of Patent:
Oct. 01, 2019

Filed:

Nov. 26, 2015

Method for manufacturing grain-oriented electrical steel sheet

Applicant:

Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;

Inventors:

Yasuyuki Hayakawa, Tokyo, JP;

Masayasu Ueno, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Chiyoda-ku, Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Keith Walker

Assistant Examiner:

John A Hevey

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (2006.01); C21D 8/12 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); B21B 3/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/34 (2006.01); B21B 1/22 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 3/02 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1266 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (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 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); C22C 38/60 (2013.01); H01F 1/16 (2013.01); B21B 2001/221 (2013.01); B21B 2265/14 (2013.01); B21B 2267/10 (2013.01); C21D 8/1244 (2013.01); C21D 2201/05 (2013.01);
Abstract

Disclosed is a method for manufacturing a grain-oriented electrical steel sheet using an inhibitor-less technique, in which cold rolling includes final cold rolling with a total cold rolling reduction being set to 85% or more and a rolling reduction per pass being set to 32% or more. The final cold rolling includes one or more passes and a final pass succeeding the one or more passes and uses work rolls having a surface roughness Ra of 0.25 μm or less in at least one of the one or more passes other than the final pass. According to this method, it is possible to stably manufacture a grain-oriented electrical steel sheet exhibiting excellent magnetic properties at low cost.

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