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公开(公告)号：US20250154618A1
公开(公告)日：2025-05-15
申请号：US19020031
申请日：2025-01-14
Applicant: JFE STEEL CORPORATION
Inventor： Hirotaka INOUE , Takeshi OMURA , Yoshihisa ICHIHARA , Shigehiro TAKAJO , Kunihiro SENDA
Abstract: A method of manufacturing a grain-oriented electrical steel sheet includes sequentially subjecting a slab for grain-oriented electrical steel sheet to hot rolling, cold rolling, decarburization annealing, final annealing after applying an annealing separator to a surface of the steel sheet, and flattening annealing. After the cold rolling and before the applying of an annealing separator, resist ink is applied to one side of the steel sheet. A laser is repeatedly scanned across a rolling direction of the steel sheet on the applied surface to remove resist ink. Electrolytic etching is applied on the removed areas to form grooves that extend linearly across the rolling direction and are lined up at intervals in the rolling direction. The scanning of the laser is performed with an irradiation energy of the laser being less than 30 J/m and a temperature of the steel sheet being 40° C. to 200° C.
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12.发明申请公开(公告)号：US20250146110A1
公开(公告)日：2025-05-08
申请号：US18697730
申请日：2022-10-31
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Ryota HOSOYA , Hiroi YAMAGUCHI
Abstract: This disclosure discloses a method for manufacturing a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet manufactured by the method. The method comprises heating a slab having a predetermined composition by induction heating in a frequency range of 20 to 1000 Hz under predetermined conditions, where the average current flowing in the coil is monotonically decreased as time passes during slab heating; subjecting the slab to finish rolling performed with the rolling finish temperature set to 950° C. or lower at one or both of the leading or trailing end; soaking the hot-rolled sheet at 750° C. or higher for 5 to 90 seconds to obtain a hot band annealed sheet; then cold rolling the annealed sheet once, or twice or more with intermediate annealing performed therebetween to obtain a cold-rolled sheet having a final sheet thickness; and subjecting the cold-rolled sheet to primary and secondary recrystallization annealings.
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13.发明公开公开(公告)号：US20240229199A9
公开(公告)日：2024-07-11
申请号：US18547692
申请日：2022-03-02
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Hiroi YAMAGUCHI
CPC classification number: C22C38/02 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C22C38/001 , C22C38/04 , C22C38/06 , C22C38/60
Abstract: The method includes slab-heating a steel slab to a temperature of higher than a γ-phase precipitation temperature and 1380° C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain εt of 0.50 or more and to finish rolling with a rolling finish temperature of 900° C. or higher to obtain a hot-rolled sheet, cooling the sheet for 1 second or longer at a cooling rate of 70° C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600° C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.
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公开(公告)号：US20230212706A1
公开(公告)日：2023-07-06
申请号：US17998926
申请日：2021-03-26
Applicant: JFE STEEL CORPORATION
Inventor： Hirotaka INOUE , Takeshi OMURA , Yoshihisa ICHIHARA , Shigehiro TAKAJO , Kunihiro SENDA
CPC classification number: C21D9/46 , C21D8/1255 , C21D8/1283 , C21D8/1222 , C21D8/1233 , C21D6/008 , C21D8/1294 , C21D8/1272 , H01F1/16
Abstract: Provided is a grain-oriented electrical steel sheet which has been subjected to heat-resistant magnetic domain refining treatment and can effectively suppress carburizing and nitriding during stress relief annealing. The grain-oriented electrical steel sheet has a plurality of grooves on one side that extend linearly across the rolling direction and are lined up at intervals in the rolling direction, and has at least a forsterite film on a surface of the steel sheet, where an average thickness of the forsterite film formed on the floor of the grooves is 0.45 μm or more, and a standard deviation a of the thickness is 0.34 μm or less.
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15.发明公开公开(公告)号：US20230212703A1
公开(公告)日：2023-07-06
申请号：US17997044
申请日：2021-03-26
Applicant: JFE STEEL CORPORATION
Inventor： Ryuichi SUEHIRO , Takeshi OMURA , Shigehiro TAKAJO , Yoshihisa ICHIHARA
IPC: C21D8/12 , C21D9/46 , C22C38/60 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/00 , B23K26/364 , B23K26/402 , H01F1/16
CPC classification number: C21D8/1277 , C21D9/46 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1272 , C22C38/60 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/001 , C22C38/002 , B23K26/364 , B23K26/402 , H01F1/16 , C22C2202/02
Abstract: To form linear grooves of desired groove width on a metal strip surface and provide a grain-oriented electrical steel sheet having excellent magnetic properties, a linear groove formation method comprises: forming a resist coating on at least one surface of a metal strip; thereafter irradiating the resist coating with a laser while scanning the laser in a direction crossing a rolling direction of the metal strip, to remove the resist coating in a part irradiated with the laser; and thereafter performing etching treatment to form a linear groove in a part of the metal strip in which the resist coating is removed, wherein the resist coating contains a predetermined amount of an inorganic compound, and on the surface of the metal strip, the laser has a predetermined elliptic beam shape.
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Patent Agency Ranking
16.发明申请公开(公告)号：US20220267872A1
公开(公告)日：2022-08-25
申请号：US17630853
申请日：2020-07-03
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihisa ICHIHARA , Takeshi OMURA , Hirotaka INOUE , Shigehiro TAKAJO
IPC: C21D8/12
Abstract: A linear groove formation method including forming a coated resist on a surface of a steel sheet, irradiating two or more laser beams onto the surface of the steel sheet while scanning the laser beams in a direction intersecting the rolling direction of the steel sheet cyclically in a rolling direction of the steel sheet, and forming linear grooves by etching portions of the steel sheet. In the laser irradiating process, the coated resist is removed continuously in a sheet transverse direction of the steel sheet by using the laser beams irradiated from respective ones of two or more laser irradiation devices arranged in the sheet transverse direction, and the laser beams are irradiated by shifting centers of two of the laser beams irradiated from two of the laser two of the laser irradiation devices adjacent to each other in the sheet transverse direction.
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公开(公告)号：US20180147663A1
公开(公告)日：2018-05-31
申请号：US15575920
申请日：2016-07-06
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Masanori UESAKA
IPC: B23K26/073 , B23K26/364 , C21D8/12 , C21D10/00 , C23F1/28
CPC classification number: B23K26/0738 , B23K26/073 , B23K26/364 , C21D8/12 , C21D8/1277 , C21D10/005 , C23F1/28 , C25F3/06 , H01F1/16
Abstract: A linear groove formation method of forming linear grooves in a steel sheet surface using etching can form linear grooves of a uniform shape while suppressing a decrease in magnetic property of a grain-oriented electrical steel sheet caused by laser irradiation for resist removal. A linear groove formation method includes: coating a surface of a grain-oriented electrical steel sheet with a resist; performing a laser scan cyclically in a rolling direction of the grain-oriented electrical steel sheet, the laser scan being applying a laser while scanning the laser in a direction crossing the rolling direction to remove the resist in a portion irradiated with the laser; and etching the grain-oriented electrical steel sheet in each portion in which the resist is removed, to form a linear groove. A coating thickness of the resist is 0.5 μm to 10 μm, and a power of the laser is 1500 W or more.
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公开(公告)号：US20240233992A9
公开(公告)日：2024-07-11
申请号：US18547693
申请日：2022-03-02
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Hiroi YAMAGUCHI
IPC: H01F1/147 , C21D1/18 , C21D6/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/34 , C22C38/42 , C22C38/48 , C22C38/60
CPC classification number: H01F1/14783 , C21D1/18 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/1211 , C21D8/1222 , C21D8/1233 , C21D8/125 , C21D8/1261 , C21D8/1272 , C21D8/1283 , C21D8/1288 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/34 , C22C38/42 , C22C38/48 , C22C38/60 , C22C2202/02
Abstract: The method includes slab-heating a steel slab to a temperature of higher than a γ-phase precipitation temperature and 1380° C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain εt of 0.50 or more and to finish rolling with a rolling finish temperature of 900° C. or higher to obtain a hot-rolled sheet, cooling the hot-rolled sheet for 1 second or longer at a cooling rate of 70° C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600° C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.
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公开(公告)号：US20240136095A1
公开(公告)日：2024-04-25
申请号：US18547693
申请日：2022-03-02
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Hiroi YAMAGUCHI
IPC: H01F1/147 , C21D1/18 , C21D6/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/34 , C22C38/42 , C22C38/48 , C22C38/60
CPC classification number: H01F1/14783 , C21D1/18 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/1211 , C21D8/1222 , C21D8/1233 , C21D8/125 , C21D8/1261 , C21D8/1272 , C21D8/1283 , C21D8/1288 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/34 , C22C38/42 , C22C38/48 , C22C38/60 , C22C2202/02
Abstract: The method includes slab-heating a steel slab to a temperature of higher than a γ-phase precipitation temperature and 1380° C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain εt of 0.50 or more and to finish rolling with a rolling finish temperature of 900° C. or higher to obtain a hot-rolled sheet, cooling the hot-rolled sheet for 1 second or longer at a cooling rate of 70° C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600° C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.
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20.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
Applicant: JFE STEEL CORPORATION
Inventor： Shigehiro TAKAJO , Takeshi OMURA , Nobuko NAKAGAWA
CPC classification number: C23F4/02 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1272 , C21D2201/05
Abstract: 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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