GRAIN-ORIENTED MAGNETIC STEEL SHEET AND PROCESS FOR PRODUCING SAME

Title:

GRAIN-ORIENTED MAGNETIC STEEL SHEET AND PROCESS FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2012/017670

Kind Code:

A1

Abstract:

Provided is a grain-oriented magnetic steel sheet reduced in iron loss by magnetic-domain refinement. When layers of the grain-oriented magnetic steel sheet are stacked and used as a transformer core, etc., the core is inhibited from generating a noise. A grain-oriented magnetic steel sheet having a coating film which has a total length of surface cracks of 20 µm or less per 10,000 µm2 is subjected to magnetic-domain refinement by imposing thermal strain thereon linearly in a direction crossing the rolling direction of the steel sheet, at a given interval along the rolling direction, thereby regulating the warpage of the steel sheet to 3 mm or less per 500 mm of the rolling-direction length.

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Inventors:

SHINGAKI YUKIHIRO (JP)
MAKIISHI NORIKO (JP)
IMAMURA TAKESHI (JP)

Application Number:

PCT/JP2011/004441

Publication Date:

February 09, 2012

Filing Date:

August 04, 2011

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
SHINGAKI YUKIHIRO (JP)
MAKIISHI NORIKO (JP)
IMAMURA TAKESHI (JP)

International Classes:

C22C38/00; B23K15/00; C21D8/12; C22C38/04; C22C38/60; H01F1/16; H01F1/18

Foreign References:

JPH01208421A	1989-08-22
JPH11293340A	1999-10-26
JP2009235472A	2009-10-15
JP2009235473A	2009-10-15
JPH04362139A	1992-12-15
JP4782248B1	2011-09-28
JPS572252B2	1982-01-14
JPH0672266B2	1994-09-14

Other References: