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Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET FOR LOW-NOISE TRANSFORMER, AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JP2015161017
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To obtain a grain-oriented electrical steel sheet capable of carrying out a magnetic domain fragmentation treatment under the condition concurrently satisfying low iron loss and low noise of a transformer which was regarded difficult before, and having nonconventional low iron loss and low magnetostriction.SOLUTION: There are provided a grain-oriented electrical steel sheet administering a magnetic domain fragmentation by irradiating the line area in a direction crossing with a rolling direction on the surface of the steel sheet with an electron beam, and a method for production of the electrical steel sheet. The production method is characterized by assuming two areas comprising a retention area and a travel area as a repeating unit, assuming an irradiation area as a modulated irradiation area connecting the repeating unit in a line area direction, controlling the cycle of the repeating unit in the modulated irradiation area to 0.20 to 1.0 mm, controlling the repetition interval of the modulated irradiation area in a rolling direction to 4.0 to 12.5 mm, and further controlling the intensity of the electron beam from the intensity in which a divided magnetic domain spindled to at least an irradiation face side in the direction of the modulated irradiation area is formed to that in which film damage on an irradiation face side or formation of the area of plastic strain does not occur.

Inventors:
TODA HIROAKI
TAKAGI SHIGEHIRO
SUEHIRO RYUICHI
KOMATSUBARA MICHIRO
Application Number:
JP2014038943A
Publication Date:
September 07, 2015
Filing Date:
February 28, 2014
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
C21D8/12; B23K15/00; H01F1/16
Domestic Patent References:
JP2013072116A2013-04-22
JP2012036445A2012-02-23
JP2012036450A2012-02-23
Foreign References:
WO2013100200A12013-07-04
WO2013046716A12013-04-04
Attorney, Agent or Firm:
Kenji Sugimura
Keisuke Kawahara