GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND MANUFACTURING METHOD FOR SAME

WIPO Patent Application WO/2012/001953

A1

When manufacturing a grain-oriented electromagnetic steel sheet provided with a forsterite film and tension coating on the surface thereof according to the present invention: (1) the Cr content of the grain-oriented electromagnetic steel sheet is restricted to no more than 0.1 mass%; (2) the oxygen coating weight of the forsterite film coating amount is no less than 3.0g/m2, and the thickness of the anchor portion embedded in the base steel portion of the grain-oriented electromagnetic steel sheet is no more than 1.5 μm; and (3) for a test piece with a length of 280mm, when the test piece has the forsterite film on only one surface, the warpage of the steel sheet is at least 10mm, and when the test piece has the forsterite film and tension coating on only the said surface, the warpage of the steel sheet is at least 20mm. Thus, by mitigating iron loss in the grain-oriented electromagnetic steel by controlling magnetic domain structure through laser irradiation, it is possible to obtain a grain-oriented electromagnetic steel sheet with a greater capacity to mitigate iron loss, and also an advantageous method for manufacturing the same.

YAMAGUCHI HIROI (JP)
TODA HIROAKI (JP)
OMURA TAKESHI (JP)
OKABE SEIJI (JP)

PCT/JP2011/003685

January 05, 2012

June 28, 2011

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JFE STEEL CORP (JP)
YAMAGUCHI HIROI (JP)
TODA HIROAKI (JP)
OMURA TAKESHI (JP)
OKABE SEIJI (JP)

C22C38/00; B21B3/02; C21D8/12; C21D9/46; C22C38/18; C22C38/60; C23C22/00; H01F1/16; H01F1/18

JPH09184017A	1997-07-15
JP2002302718A	2002-10-18
JP2009041074A	2009-02-26
JP2001107145A	2001-04-17
JP2006152383A	2006-06-15

SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)

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