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公开(公告)号：US20240242864A1
公开(公告)日：2024-07-18
申请号：US18562199
申请日：2022-04-27
IPC分类号： H01F1/147 , B23K26/50 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60
CPC分类号： H01F1/14783 , B23K26/50 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60 , C22C2202/02
摘要： Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending in a direction crossing the rolling direction, where the steel sheet has a closure domain inside the thermal strain-imparted region, the thermal strain-imparted region has maximum points of tensile strain on both outer sides in the rolling direction of the closure domain, and in a strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both outer sides of the closure domain is tensile strain larger than the strain at the center between the maximum points.
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公开(公告)号：US20230178276A1
公开(公告)日：2023-06-08
申请号：US17998356
申请日：2021-03-04
IPC分类号： H01F1/16
CPC分类号： H01F1/16 , C22C2202/02 , C22C38/60
摘要： Provided is a linear groove formation pattern with which both an effect of reducing the building factor and a high magnetic flux density can be obtained. In a grain-oriented electrical steel sheet having a plurality of linear grooves extending in a direction crossing a rolling direction of the steel sheet on a surface of the steel sheet, a surface of the steel sheet between the linear grooves has a recessed defect that is recessed from the surface, a volume fraction of the recessed defect in the steel sheet is 0.0025 vol % or more and 0.01 vol % or less of a steel sheet without the recessed defect, and discontinuous portions that disrupt the extension of the linear grooves are provided at a frequency of 30 or more and 200 or less per square meter of the steel sheet.
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3.发明申请公开(公告)号：US20190017139A1
公开(公告)日：2019-01-17
申请号：US16081121
申请日：2017-03-08
发明人： Takeshi OMURA , Hirotaka INOUE , Shigehiro TAKAJO , Seiji OKABE
摘要： To reduce variations in iron loss among materials subjected to magnetic domain refining by electron beam irradiation and to stably obtain good iron loss properties, disclosed is a method of producing a grain-oriented electrical steel sheet including performing magnetic domain refining treatment by irradiating with an electron beam, in a pressure reduced area, a surface of a grain-oriented electrical steel sheet after subjection to final annealing, the method further including: before the irradiating with the electron beam, delivering the grain-oriented electrical steel sheet wound in a coil shape and heating the delivered grain-oriented electrical steel sheet to 50° C. or higher; and then cooling the grain-oriented electrical steel sheet such that the grain-oriented electrical steel sheet has a temperature of lower than 50° C. at the time of entering the pressure reduced area.
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公开(公告)号：US20240233991A1
公开(公告)日：2024-07-11
申请号：US18562217
申请日：2022-04-27
CPC分类号： H01F1/14775 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60 , C22C2202/02
摘要： Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending linearly in a direction crossing the rolling direction, and in the strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both ends of the thermal strain-imparted region is tensile strain larger than the strain at the center of the thermal strain-imparted region.
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5.发明公开公开(公告)号：US20230366101A1
公开(公告)日：2023-11-16
申请号：US18246183
申请日：2021-07-02
发明人： Shigehiro TAKAJO , Takeshi OMURA , Nobuko NAKAGAWA
CPC分类号： C23F4/02 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1272 , C21D2201/05
摘要： A grain-oriented electrical steel sheet with extremely excellent magnetic properties by removing an etching resist coating well to form narrow grooves on a metal strip surface even with low-output laser, while reducing thermal effects on the metal strip caused by laser irradiation, and a method for forming grooves on a metal strip surface, having forming an etching resist coating with 0 to 70 lightness L* on at least one side of the metal strip, irradiating laser with less than 1.5 kW output on the etching resist coating while scanning the laser in a direction that intersects a rolling direction of the metal strip to remove a portion of the etching resist coating irradiated by the laser, and etching a portion of the metal strip below the removed portion of the etching resist coating to form grooves, the lightness L* being a L* value in a CIELAB color space (CIE1976L*a*b* color space).
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6.发明公开公开(公告)号：US20230357875A1
公开(公告)日：2023-11-09
申请号：US18246334
申请日：2021-07-02
发明人： Shigehiro TAKAJO , Takeshi OMURA
IPC分类号： C21D8/12 , C21D9/46 , C21D6/00 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
CPC分类号： C21D8/1277 , C21D9/46 , C21D8/1261 , C21D8/1222 , C21D8/1233 , C21D6/008 , C21D6/005 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D2201/05 , C22C2202/02 , H01F1/14775
摘要： A method for forming grooves on a surface of a metal strip, having applying a coating agent for etching resist coating formation to a roller; then, irradiating a laser on the roller while scanning the laser in an axial direction of the roller or in a direction inclined to the axial direction to remove a portion of the coating agent for etching resist coating formation irradiated by the laser; then, bringing the roller into contact with at least one side of the metal strip to transfer the coating agent for etching resist coating formation to the at least one side of the metal strip, with an unapplied area corresponding to the removed portion of the coating agent for etching resist coating formation.
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公开(公告)号：US20200035392A1
公开(公告)日：2020-01-30
申请号：US16487994
申请日：2018-02-20
发明人： Takeshi OMURA , Hirotaka INOUE , Shigehiro TAKAJO
摘要： Disclosed is a grain-oriented electrical steel sheet including: closure domains, each containing a discontinuous region at a part thereof and extending at an angle within 30° with respect to a transverse direction of the steel sheet, wherein a closure domain overlapping portion in the discontinuous region on one surface of the steel sheet has a length α in the transverse direction that is longer than a length β in the transverse direction of the closure domain overlapping portion on the other surface of the steel sheet, and the length α satisfies 0.5≤α≤5.0 and the length β satisfies 0.2α≤β≤0.8α. Consequently, the iron loss and the deterioration of magnetostrictive properties are suppressed in discontinuous regions, which would be inevitably formed when magnetic domain refining treatment is performed using a plurality of irradiation devices.
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8.发明申请公开(公告)号：US20180119244A1
公开(公告)日：2018-05-03
申请号：US15547677
申请日：2016-02-05
发明人： Takeshi OMURA , Hirotaka INOUE , Seiji OKABE
IPC分类号： C21D9/46 , C22C38/60 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04 , C23C22/08 , G01R33/18 , G01H9/00 , H01F10/08 , H01F27/33
摘要： Provided is a grain-oriented electrical steel sheet having an excellent noise property in an actual transformer. Magnetostrictive properties of the grain-oriented electrical steel sheet are set such that the number of acceleration/deceleration points that are present in the magnetostriction velocity level dλ/dt in one period of magnetostrictive vibration is 4 and the magnitude of velocity level change between adjacent velocity change points in an acceleration zone or deceleration zone of magnetostrictive vibration is 3.0×10−4 sec−1 or less.
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公开(公告)号：US20180037965A1
公开(公告)日：2018-02-08
申请号：US15552297
申请日：2016-02-12
发明人： Shigehiro TAKAJO , Takeshi OMURA , Seiji OKABE
IPC分类号： C21D8/12 , H01F1/16 , H01F27/245
CPC分类号： C21D8/1294 , C21D8/12 , C21D8/1288 , C21D9/46 , C21D2201/05 , H01F1/16 , H01F27/245
摘要： Disclosed are a grain-oriented electrical steel sheet having strain regions extending in a direction transverse to a rolling direction at periodic interval s (mm) in the rolling direction. Each strain region has a closure domain region whose width in the rolling direction varies periodically on a steel sheet surface. Each closure domain region satisfies: Wmax/Wmin=1.2 or more and less than 2.5, where Wmax and Wmin respectively denote a maximum width and a minimum width on the steel sheet surface as measured in the rolling direction; Wave being 80 μm or more, where Wave denotes an average width on the steel sheet surface as measured in the rolling direction; D being 32 μm or more, where D denotes a maximum depth as measured in the sheet thickness direction; and (Wave*D)/s being 0.0007 mm or more and 0.0016 mm or less.
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公开(公告)号：US20240052447A1
公开(公告)日：2024-02-15
申请号：US18258210
申请日：2021-09-22
IPC分类号： C21D8/12
CPC分类号： C21D8/1272 , C21D8/1233 , C21D8/1283 , C21D2201/05
摘要： Provided is a grain-oriented electrical steel sheet that can benefit from the iron loss improving effect by groove formation while effectively suppressing a decrease in magnetic flux density. A grain-oriented electrical steel sheet comprises predetermined linear grooves, wherein in each linear groove, a proportion of predetermined flat portions to an entire length of the linear groove is 30% or more and 90% or less, the number of flat portions each of which is continuous for a predetermined length is 10 or more per 100 cm2 surface area, and a ratio of ten-point average roughness Rzjis to average depth D is 0.1 or more and 1 or less.
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