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：US20240266102A1

公开(公告)日：2024-08-08

申请号：US18684573

申请日：2022-10-04

Applicant: NIPPON STEEL CORPORATION

Inventor： Takahito MIZUMURA ,  Hisashi MOGI ,  Masaru TAKAHASHI

IPC: H01F27/245 ,  H01F1/147 ,  H01F3/02 ,  H01F41/02

CPC classification number: H01F27/2455 ,  H01F3/02 ,  H01F1/14775 ,  H01F41/0233

Abstract: The wound core of the present invention has at least one arbitrary bent region 5A, in a plurality of corner portions (3), in which the corner portion (3) bulges outward to confine the magnetic flux flowing in the wound core so that the angle θ formed by the straight line PQ and the straight line PR satisfies 23°≤θ≤50°.

公开(公告)号：US20220341043A1

公开(公告)日：2022-10-27

申请号：US17761958

申请日：2020-09-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shuichi YAMAZAKI ,  Takuya MATSUMOTO ,  Hiroyasu FUJII ,  Masaru TAKAHASHI

IPC: C23C22/20 ,  C21D9/46

Abstract: There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the water-soluble organic compound has an SP value that is within a range of 10.0 to 20.0 (cal/cm3)1/2, the metal phosphate contains aluminum and zinc as metallic elements, and when measurement by an X-ray photoelectron spectroscopy is performed from a surface of the insulating coating film in a thickness direction of the non-oriented electrical steel sheet, a depth at which a strength of a 2p peak of zinc reaches a maximum is present closer to the surface side than a depth at which a strength of a 2p peak of aluminum reaches a maximum, and a maximum value of the strength of the 2p peak of zinc is 1 to 20 times a strength of the 2p peak of aluminum at the depth at which the strength of the 2p peak of zinc reaches a maximum.

公开(公告)号：US20220145418A1

公开(公告)日：2022-05-12

申请号：US17437726

申请日：2019-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE ,  Masaru TAKAHASHI ,  Fuminobu MURAKAMI ,  Shinichi MATSUI ,  Masahiro YAMAMOTO

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H01F41/02

Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet contains Si, Al, and Mn as chemical composition, and an alignment degree to {5 5 7} orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.

公开(公告)号：US20210027922A1

公开(公告)日：2021-01-28

申请号：US16962798

申请日：2019-01-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato YASUDA ,  Masaru TAKAHASHI ,  Yoshiyuki USHIGAMI ,  Shinya YANO

IPC: H01F1/147 ,  C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00

Abstract: A grain oriented electrical steel sheet includes: a base steel sheet; a lower layer which is arranged in contact with the base steel sheet; and an insulation coating which is arranged in contact with the lower layer and which includes a phosphate and a colloidal silica as main components. The base steel sheet includes the predetermined chemical composition and includes a B compound whose major axis length is 1 to 20 μm and whose number density is 1×10 to 1×106 pieces/mm3. The lower layer is a glass film which includes a forsterite as main component or an intermediate layer includes a silicon oxide as main component.

公开(公告)号：US20230395319A1

公开(公告)日：2023-12-07

申请号：US18033120

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Takahito MIZUMURA ,  Hisashi MOGI ,  Masato MIZOKAMI ,  Masaru TAKAHASHI

IPC: H01F41/02 ,  H01F27/245 ,  H01F3/04

CPC classification number: H01F41/024 ,  H01F27/2455 ,  H01F3/04

Abstract: A wound core (10) in which, in a laminating direction, when the surface roughness of a steel sheet portion in a direction connecting a center in a sheet thickness direction of a grain-oriented electrical steel sheet (1) positioned on the innermost periphery of the wound core among the laminated grain-oriented electrical steel sheets (1) and a center in the sheet thickness direction of the grain-oriented electrical steel sheet (1) positioned on the outermost periphery of the wound core (10) is Ral, and the surface roughness of the grain-oriented electrical steel sheet (1) in a direction parallel to a longitudinal direction on an end surface of a planar portion (4) of the laminated grain-oriented electrical steel sheet (1) is Rac, a ratio Ral/Rac between Rat and Rac satisfies the relationship of 1.5≤Ral/Rac≤12.0.

公开(公告)号：US20230386740A1

公开(公告)日：2023-11-30

申请号：US18031580

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Masaru TAKAHASHI ,  Takahito MIZUMURA

IPC: H01F41/02 ,  H01F1/16 ,  H01F27/245

CPC classification number: H01F41/024 ,  H01F1/16 ,  H01F27/2455

Abstract: In this method of producing a wound core, at least one bent portion (5) of one or more laminated grain oriented electrical steel sheets (1) is formed such that one side (1b) of the steel sheet (1) is placed and constrained on a die (30) and a punch (40) is press formed against a portion (1a) of the steel sheet (1) to be bent on the other free end side in the thickness (T) direction of the steel sheet. Outer surfaces of the die and the punch each have an arc portion (30a, 40a) having a predetermined curvature, and when the thickness of the steel sheet (1) is T, bent angles of the bent portions (5) are θ(°), a radius of curvature of the arc portion (30a) of the die is Rd, and a radius of curvature of the arc portion (40a) of the punch is Rp, relationships of Equations (1) to (5) below are satisfied.


0.02≤T/(2Rd+T)≤0.15   (1)



0.5 ≤Rd ≤3.0   (2)



0.15 ≤T ≤0.30   (3)



2.5≤Rp/Rd≤10   (4)



10°≤θ≤90°  (5)

公开(公告)号：US20220336129A1

公开(公告)日：2022-10-20

申请号：US17761971

申请日：2020-09-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shuichi YAMAZAKI ,  Takuya MATSUMOTO ,  Hiroyasu FUJII ,  Masaru TAKAHASHI

IPC: H01F1/18 ,  B05D1/02 ,  B05D1/18 ,  C09D7/61 ,  C08K3/32 ,  C09D133/08

Abstract: There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the metal phosphate contains at least aluminum as a metallic element, the organic resin has an SP value being within a range of 18.0 (MPa)0.5 or more to less than 24.0 (MPa)0.5, the water-soluble organic compound has an SP value being within a range of 19.0 (MPa)0.5 or more to less than 35.0 (MPa)0.5, and when measurement by X-ray diffractometry is performed on the insulating coating film, a degree of crystallinity of aluminum phosphate calculated from a peak from the metal phosphate is within a range of 0.5 to 5.0%.

公开(公告)号：US20190271087A1

公开(公告)日：2019-09-05

申请号：US16343452

申请日：2017-10-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Tomoya SUENAGA ,  Shuichi YAMAZAKI ,  Masaru TAKAHASHI

IPC: C23F11/18 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D3/04

Abstract: A grain-oriented electrical steel sheet has a steel sheet and an insulating coating which is formed on a surface of the steel sheet. In the insulating coating, a metal phosphate and a colloidal silica are contained, the colloidal silica is contained in an amount of 20 to 150 parts by mass with respect to 100 parts by mass of the metal phosphate, one or more kinds of fine particles selected from the group consisting of silicon carbide, silicon nitride, aluminum nitride, boron nitride, sialon, and cordierite are further contained in an amount of 0.5 to 7 parts by mass with respect to 100 parts by mass of the metal phosphate, an average particle size of the fine particles is 0.3 to 7.0 μm, crystallized ratio of the metal phosphate is 2% to 40%, and chromium is not contained.