发明名称 |
ORIENTED ELECTROMAGNETIC STEEL SHEET FOR LOW-NOISE TRANSFORMER, AND METHOD FOR MANUFACTURING SAID SHEET |
摘要 |
An oriented electromagnetic steel sheet processed using magnetic domain segmentation treatment by having the steel sheet surface irradiated with an electron beam measuring 0.40 mm or less in diameter (d) in a linear area having a direction intersecting the rolling direction, wherein: modulated-irradiation linear areas are obtained by connecting repeating units in the linear-area direction; the period of the repeating units in the modulated-irradiation linear area is 2/3 × d to 2.5 × d mm; the repeating interval of the modulated-irradiation linear area in the rolling direction is 4.0-12.5 mm; and the intensity of the electron beam is brought to a level equal to or greater than that at which split magnetic domains are formed extending in the direction of the modulated-irradiation linear area at least on the irradiation-surface side, and up to a level at which the coating is not damaged and no plastic strain areas are formed on the irradiation-surface side. It is thereby possible to carry out the hitherto challenging magnetic-domain segmentation process in a transformer in which iron loss and noise are both low, and obtain an oriented electromagnetic steel sheet that has unprecedentedly low iron loss and magnetic distortion. |
申请公布号 |
WO2015129255(A1) |
申请公布日期 |
2015.09.03 |
申请号 |
WO2015JP00934 |
申请日期 |
2015.02.24 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
TODA, HIROAKI;TAKAJO, SHIGEHIRO;KOMATSUBARA, MICHIRO |
分类号 |
C21D8/12;B23K15/00;H01F1/16;H01F41/02 |
主分类号 |
C21D8/12 |
代理机构 |
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代理人 |
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