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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 9905343 B1

PDFFull Text
Date of Patent:
Feb. 27, 2018

Filed:

Dec. 25, 2013

Production method for grain-oriented electrical steel sheet and primary recrystallized steel sheet for production of grain-oriented electrical steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yukihiro Shingaki, Kurahiki, JP;

Yasuyuki Hayakawa, Asakuchi, JP;

Hiroi Yamaguchi, Kurashiki, JP;

Hiroshi Matsuda, Chiba, JP;

Yuiko Wakisaka, Kurashiki, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Jessee Roe

Int. Cl.
CPC ...
H01F 1/147 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); H01F 41/02 (2006.01); C23C 8/26 (2006.01); C23C 8/50 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (2006.01); C22C 38/02 (2006.01); C23C 8/02 (2006.01); C23C 8/80 (2006.01); C21D 6/00 (2006.01);
U.S. Cl.
CPC ...
H01F 1/14775 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1261 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C21D 8/1294 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/60 (2013.01); C23C 8/02 (2013.01); C23C 8/26 (2013.01); C23C 8/50 (2013.01); C23C 8/80 (2013.01); H01F 1/16 (2013.01); H01F 41/02 (2013.01); C21D 6/008 (2013.01); C21D 2211/004 (2013.01);
Abstract

A method for producing a grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a specific composition; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment with a nitrogen increase of 50 to 1000 ppm, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and setting the staying time in a temperature range of 300 to 800° C. in the secondary recrystallization annealing to 5 to 150 hours.

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