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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 9663839 B1

PDFFull Text
Date of Patent:
May. 30, 2017

Filed:

Dec. 16, 2011

Method for manufacturing grain-oriented electrical steel sheet having excellent magnetic properties

Applicants:

Hyung-don Joo, Pohang-si, KR;

Chang-soo Kim, Pohang-si, KR;

Jong-tae Park, Pohang-si, KR;

Jong-ho Park, Pohang-si, KR;

Byeong-goo Kim, Pohang-si, KR;

Jin-wook Seo, Pohang-si, KR;

Inventors:

Hyung-Don Joo, Pohang-si, KR;

Chang-Soo Kim, Pohang-si, KR;

Jong-Tae Park, Pohang-si, KR;

Jong-Ho Park, Pohang-si, KR;

Byeong-Goo Kim, Pohang-si, KR;

Jin-Wook Seo, Pohang-si, KR;

Assignee:

POSCO, Gyeonsangbuk-do, KR;

Attorney:

The Webb Law Firm

Primary Examiner:

Jessee Roe

Assistant Examiner:

Jenny Wu

Int. Cl.
CPC ...
C21D 8/02 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 6/00 (2006.01); C22C 1/02 (2006.01);
U.S. Cl.
CPC ...
C21D 8/0263 (2013.01); C21D 6/008 (2013.01); C21D 8/12 (2013.01); C21D 8/1272 (2013.01); C21D 9/46 (2013.01); C22C 1/02 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01);
Abstract

Provided is a method for manufacturing a grain-oriented electrical steel sheet, the method comprising: heating a grain-oriented electrical steel sheet slab; hot-rolling the heated slab; optionally annealing the hot-rolled steel sheet; subjecting the resulting steel sheet to one cold rolling or two or more cold rollings with intermediate annealing therebetween; subjecting the cold-rolled steel sheet to primary recrystallization annealing; and subjecting the annealed steel sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing sequentially comprises an ultra-rapid heating process of heating the steel sheet at an average heating rate of 300° C./sec or higher, a rapid heating process of heating the steel sheet at a lower average heating rate than the average heating rate of the ultra-rapid heating process, but not lower than 100° C./sec, and a general heating process of heating the steel sheet at a lower average heating rate than the average heating rate of the rapid heating process.

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