Metal treatment – Stock – Magnetic
Reexamination Certificate
2006-05-16
2006-05-16
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Magnetic
C148S306000, C148S111000, C148S112000, C148S113000
Reexamination Certificate
active
07045025
ABSTRACT:
A low core loss grain-oriented electrical steel sheet that does not have a significant deterioration in a magnetic flux density and a decrease of a space factor, and which may withstand stress-relieving annealing is provided. Melted and re-solidified layers can be formed on either or both of the surfaces of the grain-oriented electrical steel sheet that extend in a direction that is perpendicular to the rolling direction (e.g., in the direction of the width thereof), at a cyclic interval of not less than approximately 2 mm to less than approximately 5 mm in the rolling direction. The melted and re-solidified layers may be provided on each surface of the grain-oriented electrical steel sheet, and can have an aspect ratio that is a ratio of the depth to the width of the melted and re-solidified layer of not less than approximately 0.20 and a depth of not less than approximately 15 μm. In addition, the melted and re-solidified layers can be formed by using a laser.
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Eorpean Search Report Application No. 0301166, dated Sep. 26, 2003.
Japanese Unexamined Patent Publcation No. 2000-109961, published Apr. 18, 2000.
Hamada Naoya
Hamamura Hideyuki
Sakai Tatsuhiko
Baker & Botts L.L.P.
Nippon Steel Corporation
Sheehan John P.
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