GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR IMPROVING IRON LOSS PROPERTIES THEREOF

WIPO Patent Application WO/2013/099274

A8

Provided is a grain-oriented electrical steel sheet that has been subjected to magnetic-domain refinement via strain introduction and has a highly insulating, highly corrosion-resistant insulating coating. Exposure to a high-energy beam is used to introduce linear strain into said grain-oriented electrical steel sheet, said linear strain extending in a direction that intersects the direction in which the steel sheet is rolled, and the grain-oriented electrical steel sheet is then recoated with an insulating coating. Defects in said insulating coating cover no more than 40% of the surface area of mark regions produced by the high-energy beam, the maximum width of said mark regions in the direction in which the steel sheet is rolled is no more than 250 µm, and the insulating coating with which the grain-oriented electrical steel sheet is recoated is 0.3 to 2.0 µm thick.

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INOUE HIROTAKA (JP)
TAKAJO SHIGEHIRO (JP)
YAMAGUCHI HIROI (JP)
OKABE SEIJI (JP)
HANAZAWA KAZUHIRO (JP)

PCT/JP2012/008411

May 15, 2014

December 27, 2012

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JFE STEEL CORP (JP)

C22C38/00; C21D8/12; C21D9/46; C22C38/60; C23C22/00; C23C22/74; H01F1/16

SUGIMURA, Kenji (3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, JP)

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