发明名称 |
GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET EXHIBITING EXTREMELY SMALL WATT LOSS AND METHOD FOR PRODUCING THE SAME |
摘要 |
The present invention relates to a grain-oriented magnetic steel sheet having extremely low iron loss, which is suitable for use as an iron core material for transformers and power generators, and to a method for producing the same. That is, in accordance with the present invention, a method for producing a grain-oriented magnetic steel sheet includes the step of forming a coating layer on a surface of the matrix of a steel sheet having a thickness of 0.27 mm or less by vapor deposition in a low oxidizing atmosphere with an oxygen partial pressure (Po2) of less than 0.1 atm and a total pressure of 0.1 atm or more. A grain-oriented magnetic steel sheet of the present invention having extremely low iron loss with a thickness of 0.27 mm or less includes a coating layer formed by vapor deposition on a matrix surface. The coating layer is composed of a material that has a smaller coefficient of thermal expansion than that of iron, the coating layer has a porosity of 10% or less and a mean thickness of not less than 0.1 mu m and not more than 10 mu m and the surface of the coating layer has a centerline mean roughness (Ra) of less than 0.5 mu m. <IMAGE> |
申请公布号 |
EP1375693(A4) |
申请公布日期 |
2004.12.01 |
申请号 |
EP20010917833 |
申请日期 |
2001.04.05 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
TAKASHIMA, MINORU;MURAKI, MINEO;YAMAGUCHI, HIROI;KUROSAWA, MITSUMASA;KOMATSUBARA, MICHIRO |
分类号 |
C21D8/12;C22C38/00;C22C38/06;C23C14/06;C23C14/08 |
主分类号 |
C21D8/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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