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    IRON CORE FOR TRANSFORMER
    1.
    发明公开
    IRON CORE FOR TRANSFORMER 审中-公开

    公开(公告)号：EP3780036A1

    公开(公告)日：2021-02-17

    申请号：EP19775886.5

    申请日：2019-03-29

    申请人： JFE Steel Corporation

    发明人： OMURA, Takeshi ,  INOUE Hirotaka ,  OKABE Seiji

    IPC分类号： H01F27/245 ,  H01F1/16 ,  C21D8/12 ,  H01F41/02

    摘要： Vibration of an iron core is reduced to reduce transformer noise. An iron core for a transformer comprises a plurality of grain-oriented electrical steel sheets stacked together, wherein at least one of the plurality of grain-oriented electrical steel sheets: (1) has a region in which closure domains are formed in a direction crossing a rolling direction and a region in which no closure domains are formed; and (2) has an area ratio R of 0.10 % to 30 %, the area ratio R being an area ratio, to the whole grain-oriented electrical steel sheet, of a region in which a shrinkage amount at a maximum displacement point when excited in the rolling direction at a maximum magnetic flux density of 1.7 T and a frequency of 50 Hz is at least 2 × 10 -7 less than a shrinkage amount in the region in which no closure domains are formed.

    IRON CORE FOR TRANSFORMER
    5.
    发明公开
    IRON CORE FOR TRANSFORMER 审中-公开

    公开(公告)号：EP3780037A1

    公开(公告)日：2021-02-17

    申请号：EP19777691.7

    申请日：2019-03-29

    申请人： JFE Steel Corporation

    发明人： OMURA Takeshi ,  INOUE Hirotaka ,  OKABE Seiji

    IPC分类号： H01F27/245 ,  H01F1/16 ,  C21D8/12 ,  H01F41/02

    摘要： Vibration of an iron core is reduced to reduce transformer noise. An iron core for a transformer comprises a plurality of grain-oriented electrical steel sheets stacked together, wherein at least one of the plurality of grain-oriented electrical steel sheets: (1) has a region in which closure domains are formed in a direction crossing a rolling direction and a region in which no closure domains are formed; (2) has an area ratio R 0 of 0.10 % to 3.0 %, the area ratio R 0 being defined as a ratio of S 0 to S; and (3) has an area ratio R 1a of 50 % or more, the area ratio R 1a being defined as a ratio of S 1a to S 1 , where S is an area of the grain-oriented electrical steel sheet, S 1 is an area of the region in which the closure domains are formed, S 0 is an area of the region in which no closure domains are formed, and S 1a is, in the region in which the closure domains are formed, an area of a region in which an expansion amount at a maximum displacement point when excited in the rolling direction at a maximum magnetic flux density of 1.7 T and a frequency of 50 Hz is at least 2 × 10 -7 greater than an expansion amount in the region in which no closure domains are formed.

    GRAIN-ORIENTED ELECTRICAL STEEL SHEET
    6.
    发明公开
    GRAIN-ORIENTED ELECTRICAL STEEL SHEET 审中-公开

    公开(公告)号：EP3690067A1

    公开(公告)日：2020-08-05

    申请号：EP18862120.5

    申请日：2018-09-25

    申请人： JFE Steel Corporation

    发明人： SENDA Kunihiro ,  WATANABE Makoto ,  OKABE Seiji ,  YOSHIZAKI Souichiro

    IPC分类号： C21D8/12 ,  C22C38/00 ,  C23C22/00 ,  H01F1/147 ,  C22C38/60 ,  C25F1/06 ,  C25F3/06

    摘要： Further lower iron loss can be achieved in a grain-oriented electrical steel sheet including: a predetermined film mainly composed of forsterite on a front and back surfaces thereof; and a plurality of grooves on the front surface thereof, in which the plurality of grooves have an average depth of 6 % or more of a thickness of the steel sheet and are spaced a distance of 1 mm to 15 mm from respective adjacent grooves, the steel sheet has a specific magnetic permeability µr 15/50 of 35000 or more when subjected to alternating current magnetization at a frequency of 50 Hz and a maximum magnetic flux density of 1.5 T, and the steel sheet includes isolated parts having a presence frequency of 0.3/µm or less, the isolated parts being separated from a continuous part of the film in an interface between the steel sheet and the film in a cross section orthogonal to the rolling direction of the steel sheet.

    DEVICE FOR MANUFACTURING METAL THIN STRIP
    7.
    发明公开
    DEVICE FOR MANUFACTURING METAL THIN STRIP 审中-公开

    公开(公告)号：EP3332888A1

    公开(公告)日：2018-06-13

    申请号：EP16832759.1

    申请日：2016-07-20

    申请人： JFE Steel Corporation

    发明人： OKABE Seiji ,  IMAMURA Takeshi ,  TAKAJO Shigehiro

    IPC分类号： B22D11/06

    摘要： A single roll type apparatus for manufacturing a metal thin strip by injecting a molten metal onto an outer peripheral face of a cooling roll rotating at a high speed and rapidly solidifying it to manufacture a metal thin strip, wherein an airflow blocking device for blocking the airflow along the surface of the cooling roll is provided at an upstream side of a molten metal injection nozzle for injecting the molten metal in a rotation direction of the cooling roll, and a carbon dioxide gas injection nozzle for forming a flow of carbon dioxide gas on an outer peripheral surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle or forming a carbon dioxide atmosphere on the surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the surface of the cooling roll is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll, whereby a metal thin strip having a good surface quality can be manufactured stably even in the continuous operation for a long time.