公开(公告)号：US20230357875A1

公开(公告)日：2023-11-09

申请号：US18246334

申请日：2021-07-02

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Takeshi OMURA

IPC: C21D8/12 ,  C21D9/46 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: 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

Abstract: 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.

公开(公告)号：US20200035392A1

公开(公告)日：2020-01-30

申请号：US16487994

申请日：2018-02-20

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Hirotaka INOUE ,  Shigehiro TAKAJO

IPC: H01F1/18 ,  C21D8/12 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147

Abstract: 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.

公开(公告)号：US20180037965A1

公开(公告)日：2018-02-08

申请号：US15552297

申请日：2016-02-12

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Takeshi OMURA ,  Seiji OKABE

IPC: C21D8/12 ,  H01F1/16 ,  H01F27/245

CPC classification number: C21D8/1294 ,  C21D8/12 ,  C21D8/1288 ,  C21D9/46 ,  C21D2201/05 ,  H01F1/16 ,  H01F27/245

Abstract: 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.

公开(公告)号：US20180030559A1

公开(公告)日：2018-02-01

申请号：US15549742

申请日：2016-02-12

Applicant: JFE STEEL CORPORATION

Inventor： Masanori UESAKA ,  Makoto WATANABE ,  Shigehiro TAKAJO

IPC: C21D8/12 ,  C22C38/02 ,  C21D9/46 ,  H01F27/245 ,  C21D6/00 ,  C21D3/04 ,  B05D7/14 ,  H01F1/18 ,  C22C38/04 ,  C21D8/00

CPC classification number: C21D8/1294 ,  B05D7/14 ,  C21D3/04 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C2202/02 ,  C23C22/00 ,  H01F1/16 ,  H01F1/18 ,  H01F27/245

Abstract: In a grain-oriented electrical steel sheet including: a steel substrate; a ceramic base film; and an insulating coating, critical damage shear stress τ between the base film and the steel substrate is 50 MPa or more. Thus, a grain-oriented electrical steel sheet having excellent insulation property, stacking factor, and magnetic property is provided without coating damage even when magnetic domain refining treatment by thermal strain is performed.

公开(公告)号：US20170253940A1

公开(公告)日：2017-09-07

申请号：US15519653

申请日：2014-10-23

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Hiroaki TODA

IPC: C21D8/12 ,  C22C38/00 ,  C21D1/34 ,  C21D6/00 ,  H01F1/16 ,  C23C30/00

CPC classification number: C21D8/12 ,  C21D1/34 ,  C21D6/00 ,  C22C38/00 ,  C23C30/00 ,  H01F1/16

Abstract: Disclosed is a grain-oriented electrical steel sheet that exhibits excellent iron loss properties and a good building factor, in which damage to a tension coating is suppressed. In a grain-oriented electrical steel sheet having a tension coating, an interlaminar current is 0.15 A or less, a plurality of linear strain regions extending in a direction transverse to the rolling direction are formed, the strain regions are formed at line intervals in the rolling direction of 15 mm or less, each of the strain regions has closure domains formed therein, and each of the closure domains has a length d along the sheet thickness direction of 65 μm or more and a length w along the rolling direction of 250 μm or less.