公开(公告)号：US20240424604A1

公开(公告)日：2024-12-26

申请号：US18727039

申请日：2023-03-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Tatsuhiko SAKAI ,  Hideyuki HAMAMURA

IPC: B23K26/082

Abstract: The present steel sheet processing apparatus includes one or more support rolls and a laser irradiation unit. The laser irradiation unit includes a laser output unit, a laser scanning unit, a focusing optical unit, a housing, and an angle adjustment unit that changes an angle of the housing with respect to a steel sheet. When a surface of the steel sheet is scanned with a laser beam, the angle adjustment unit changes the angle of the housing in a plane formed by a normal direction of the steel sheet surface and a scanning direction so that a distance from the focusing optical unit to the surface of the steel sheet of the laser beam focused by the focusing optical unit is equal over a total length of a scanning region of the laser beam on the surface of the steel sheet. The laser irradiation unit irradiates the laser beam in a state in which the angle of the housing is changed by the angle adjustment unit to form grooves or residual stress regions on the surface of the steel sheet.

公开(公告)号：US20240286219A1

公开(公告)日：2024-08-29

申请号：US18571267

申请日：2022-04-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro YAMADA ,  Takeshi IMAI ,  Dairi YAJIMA ,  Hideyuki HAMAMURA ,  Yoshiaki HIROTA

IPC: B23K26/16 ,  B23K26/08 ,  B23K26/14 ,  B23K26/364 ,  B23K103/04

CPC classification number: B23K26/16 ,  B23K26/083 ,  B23K26/1464 ,  B23K26/364 ,  B23K2103/04

Abstract: A laser processing device includes: a laser light source unit that irradiates, with laser light, a surface of a steel sheet conveyed in a predetermined conveyance direction; a first nozzle that injects gas toward an irradiation site of the laser light, parallel to an optical axis direction of the laser light; and a dust collection mechanism unit that is provided only at one of an upstream side or a downstream side of the irradiation site, in the conveyance direction, and that collects, from a dust collection port, laser sputter generated from the irradiation site.

公开(公告)号：US20240177899A1

公开(公告)日：2024-05-30

申请号：US18283423

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Tomohito TANAKA ,  Masataka IWAKI ,  Kazutoshi TAKEDA ,  Hideyuki HAMAMURA

IPC: H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C21D10/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00

CPC classification number: H01F1/14783 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C21D10/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00 ,  C21D2201/05 ,  C22C2202/02

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet having a predetermined chemical composition, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, on a front surface of the base steel sheet, a plurality of linear strains that extend continuously or intermittently in a direction intersecting with a rolling direction are present, intervals p in the rolling direction of the plurality of linear strains adjacent to each other are 3.0 to 9.0 mm, widths of the linear strains are 10 to 250 μm, and, in an X-ray topographic spectrum in a range of 1.50 mm in the rolling direction that is obtained from an X-ray topographic image of the front surface and includes the linear strain at a center, a full width at half maximum of a peak of the X-ray topographic spectrum including a maximum value of a spectral intensity is 0.02 mm or more and 0.10 mm or less.

公开(公告)号：US20240150874A1

公开(公告)日：2024-05-09

申请号：US18281903

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Tomohito TANAKA ,  Masataka IWAKI ,  Nobusato MORISHIGE ,  Takashi KATAOKA ,  Hideyuki HAMAMURA

IPC: C22C38/02 ,  B23K26/06 ,  B23K26/352 ,  B23K101/18 ,  B23K103/04 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04

CPC classification number: C22C38/02 ,  B23K26/0626 ,  B23K26/352 ,  C21D8/1283 ,  C21D8/1288 ,  C22C38/004 ,  C22C38/04 ,  B23K2101/18 ,  B23K2103/04 ,  C21D2201/05

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in the base steel sheet, a plurality of linear strains that extend continuously or intermittently in a direction intersecting with a rolling direction are present, and intervals in the rolling direction of the plurality of linear strains adjacent to each other are 10 mm or less, in a region where the strains are present, a closure domain is present, a length d of the closure domain in a sheet thickness direction from a surface of the base steel sheet is 30 to 60 μm, a length w in the rolling direction is 200 μm or less, and a ratio mid of a depth m from the surface of the base steel sheet where a compressive strain in the rolling direction present in the closure domain exhibits a maximum value to the length d is in a range of more than 0.30 and less than 0.90.

公开(公告)号：US20210082606A1

公开(公告)日：2021-03-18

申请号：US16772544

申请日：2019-01-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hideyuki HAMAMURA ,  Satoshi ARAI

IPC: H01F1/147 ,  C21D8/12

Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.

公开(公告)号：US20210017619A1

公开(公告)日：2021-01-21

申请号：US16981126

申请日：2019-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato MORISHIGE ,  Takashi KATAOKA ,  Haruhiko ATSUMI ,  Yasuhiro MAYUMI ,  Toshiya TAKECHI ,  Naoto MASUMITSU ,  Tomoya SUENAGA ,  Masamitsu KUBOTA ,  Hideyuki HAMAMURA ,  Kazuhiko FUKUTANI

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/60 ,  C23G1/00 ,  H01F1/147

Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an aspect of the present invention includes a step of obtaining a hot-rolled steel sheet by carrying out hot rolling on a slab containing a predetermined component composition with a remainder including Fe and impurities, a step of obtaining a hot-rolled annealed sheet by carrying out hot-rolled sheet annealing as necessary, a step of carrying out pickling to obtain a pickled sheet, a step of carrying out cold rolling to obtain a cold-rolled steel sheet, a step of carrying out primary recrystallization annealing, a step of applying an annealing separating agent including MgO to a surface and then carrying out final annealing to obtain a final-annealed sheet, and a step of applying an insulating coating and then carrying out flattening annealing.

公开(公告)号：US20200381150A1

公开(公告)日：2020-12-03

申请号：US16971617

申请日：2019-02-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Satoshi ARAI ,  Takashi KATAOKA ,  Shunsuke OKUMURA

IPC: H01F1/147 ,  C22C38/02 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B23K26/364

Abstract: A grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a groove formed on a surface, in which, in a cross section of the grain-oriented electrical steel sheet orthogonal to the groove, a KAM value is 0.1 or more and 3.0 or less in a region on a central side in a thickness direction of the grain-oriented electrical steel sheet with respect to the groove, the region being surrounded by a square having one side in contact with a groove bottom of the groove and having a length of 50 μm in each side.

公开(公告)号：US20220219261A1

公开(公告)日：2022-07-14

申请号：US17610990

申请日：2020-05-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Hideyuki HAMAMURA

IPC: B23K26/364 ,  B23K26/082 ,  B23K26/066 ,  G02B26/12 ,  G02B19/00 ,  G02B26/08

Abstract: A groove processing device (100) that forms a groove in a surface of an object using laser beams (LB) includes: a light source device (11) that outputs the laser beams (LB); a polygon mirror (10) that reflects the laser beams output from the light source device (11); a condensing optical system that is provided on an optical path of the laser beams (LB) reflected by the polygon mirror (11) and focuses the laser beams (LB); and a shielding plate (35) that is provided between the condensing optical system and the object at a position which blocks some of the laser beams (LB) focused through the condensing optical system and blocks some of the laser beams (LB). Among the laser beams (LB) focused through the condensing optical system, some of the laser beams (LB) that are not blocked by the shielding plate (35) form the groove in the surface of the object at a focus of the laser beams (LB). The shielding plate (35) is provided closer to the condensing optical system than the focus and is rotated with respect to the surface of the object so as to block the laser beams (LB) that do not form the groove.

公开(公告)号：US20250154631A1

公开(公告)日：2025-05-15

申请号：US18838639

申请日：2023-04-04

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato YASUDA ,  Hideyuki HAMAMURA ,  Nobusato MORISHIGE ,  Masaru TAKAHASHI ,  Kimihiko SUGIYAMA

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

Abstract: The present invention has as its object to provide grain-oriented electrical steel sheet better improved in core loss in control of magnetic domains for forming laser grooves in cold rolled steel sheet. The present invention provides grain-oriented electrical steel sheet meeting the following requirements for achieving the object:
That is, it provides grain-oriented electrical steel sheet comprising a base material steel sheet having a plurality of grooves on its surface and a glass coating on the surface of the base material steel sheet, in which grain-oriented electrical steel sheet, an absolute value of an angle θ formed by a direction perpendicular to a rolling direction and a sheet thickness direction of the base material steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 μm to 300 μm, a depth D of the grooves is 10 μm to 40 μm, and a pitch P of the grooves in the rolling direction is 1.0 mm to 30.0 mm, and, at an inside of the glass coating directly under surfaces of the recessed parts of the grooves, one or more fine grains of a long axis of 1 μm or more and 20 μm or less are present in a cross-section perpendicular to the longitudinal direction of the grooves.

公开(公告)号：US20240177901A1

公开(公告)日：2024-05-30

申请号：US18283162

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Masataka IWAKI ,  Takashi KATAOKA ,  Tomohito TANAKA ,  Hideyuki HAMAMURA

IPC: H01F1/18 ,  C03C8/02 ,  C03C10/00 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C21D10/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00

CPC classification number: H01F1/18 ,  C03C8/02 ,  C03C10/00 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C21D10/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00 ,  C03C2204/00 ,  C03C2207/04 ,  C21D2201/05 ,  C22C2202/02

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in which, in the base steel sheet, a plurality of linear strain regions that extend continuously or intermittently in a direction intersecting with a rolling direction are present, the plurality of linear strain regions are each 210 μm or less in width in the rolling direction, the plurality of linear strain regions are parallel to each other, intervals of linear strain regions adjacent to each other in the rolling direction are 10 mm or less, and magnetostriction λ0-pb in a unit of μm/m when the grain-oriented electrical steel sheet is excited up to 1.7 T and magnetostriction λ0-pa in a unit of μm/m when the grain-oriented electrical steel sheet is heat-treated at 800° C. for 4 hours and then excited up to 1.7 T satisfy 0.02≤λ0-pb−λ0-pa≤0.20.