公开(公告)号：US20220029478A1

公开(公告)日：2022-01-27

申请号：US17297617

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: H02K1/12 ,  H02K15/02

Abstract: A laminated core includes a plurality of electrical steel sheets which are stacked on each other and of each of which both surfaces are coated with an insulation coating; and an adhesion part which is provided between the electrical steel sheets adjacent in the stacking direction and adheres the electrical steel sheets to each other, wherein an adhesive for forming the adhesion part includes a first phase and a second phase, wherein the adhesion part has a sea-island structure of the first phase which is a sea structure portion and the second phase which is an island structure portion, wherein the first phase contains an epoxy resin, an acrylic resin, and a curing agent, wherein the first phase has an SP value of 8.5 to 10.7 (cal/cm3)1/2, wherein the second phase contains an elastomer, and wherein the second phase has an SP value of 7.5 to 8.4 (cal/cm3)1/2.

公开(公告)号：US20210123115A1

公开(公告)日：2021-04-29

申请号：US17258968

申请日：2018-07-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Yoshiyuki USHIGAMI ,  Shuichi NAKAMURA ,  Hiroyasu FUJII ,  Shunsuke OKUMURA

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/18 ,  C22C38/16 ,  H01F1/14

Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 μm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm−1 and a peak intensity IB at 1200 cm−1 satisfy IB/IA≥0.010.

公开(公告)号：US20250043373A1

公开(公告)日：2025-02-06

申请号：US18923474

申请日：2024-10-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi YAMAZAKI ,  Kazutoshi TAKEDA ,  Hiroyasu FUJII ,  Toru NAGAI

IPC: C21D8/12 ,  C09D1/00 ,  C09D7/40 ,  C09D7/61 ,  C23C30/00

Abstract: In the present invention, there is provided a coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet, including: a solvent; and one or two more layered clay mineral powders having a specific surface area of 20 m2/g or more. In addition, in the present invention, there is provided a grain-oriented electrical steel sheet including: a base metal; and an insulation coating provided on a surface of the base metal, in which the insulation coating contains SiO2, and one or two of Al2O3 and MgO, and has a porosity of 10% or less.

公开(公告)号：US20230395291A1

公开(公告)日：2023-12-07

申请号：US18271622

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu FUJII ,  Jun MAKI ,  Kazutoshi TAKEDA ,  Akira AKAGI ,  Yuya FUJII

IPC: H01F1/147 ,  B32B15/18 ,  B32B15/04 ,  C23C22/03 ,  C23C22/82

CPC classification number: H01F1/147 ,  B32B15/18 ,  B32B15/043 ,  C23C22/03 ,  C23C22/82 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/714 ,  B32B2307/704 ,  B32B2307/748 ,  B32B2307/206

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention is a non-oriented electrical steel sheet including a base metal steel sheet and a composite coating film that is formed on surfaces of the base metal steel sheet and includes Zn-containing phosphate and an organic resin, wherein the non-oriented electrical steel sheet contains crystalline aluminum phosphate showing diffraction lines belonging to ICDD No. 01-074-3256 when the composite coating film is measured by a wide-angle X-ray diffraction method.

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：US20220098694A1

公开(公告)日：2022-03-31

申请号：US17422695

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Shuichi NAKAMURA ,  Hiroyasu FUJII ,  Norikazu FUJII

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/04 ,  C22C38/60 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing. The silicon steel material contains: in terms of mass %, Si: 0.8 to 7.0%; C: 0.085% or less; acid-soluble Al: 0.010 to 0.065%; N: 0.004 to 0.012%; Mn: 1.00% or less; S: 0.050% or less; a total of 0.01 to 0.20% of one or both of Sn and Sb; and the remainder: Fe and impurities.

公开(公告)号：US20210272728A1

公开(公告)日：2021-09-02

申请号：US17259119

申请日：2018-07-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Yoshiyuki USHIGAMI ,  Shuichi NAKAMURA ,  Hiroyasu FUJII ,  Yoichi ZAIZEN

IPC: H01F1/147 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/34 ,  C22C38/20 ,  C22C38/32 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C23C8/14

Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.0010 to 0.0100% of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.02% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 μm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, a time differential curve fM(t) of a glow discharge optical emission spectrum of a metallic element M (Al) in the SiO2 intermediate oxide film layer satisfies a predetermined condition.

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：US20220316022A1

公开(公告)日：2022-10-06

申请号：US17440646

申请日：2020-04-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu FUJII ,  Jun MAKI ,  Kazutoshi TAKEDA ,  Hiroyuki MIMURA ,  Yusuke KANTO ,  Shuichi YAMAZAKI

IPC: C21D8/12 ,  H01F1/18

Abstract: A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”.

公开(公告)号：US20220102035A1

公开(公告)日：2022-03-31

申请号：US17422011

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yoshiyuki USHIGAMI ,  Hiroyasu FUJII

IPC: H01F1/147 ,  C21D9/46 ,  C23C22/78 ,  C21D8/12 ,  C21D6/00

Abstract: A grain-oriented electrical steel sheet according to an aspect of the present invention includes an underlying steel sheet and a tension-insulation coating arranged on the surface of the underlying steel sheet, and a ten-point average roughness RzL in an L direction obtained when the tension-insulation coating is removed from the grain-oriented electrical steel sheet with an alkaline solution, and then the surface of the underlying steel sheet is measured in a rolling direction is 6.0 μm or less.