公开(公告)号：US20210381072A1

公开(公告)日：2021-12-09

申请号：US17283208

申请日：2019-10-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi YAMAZAKI ,  Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C21D9/46 ,  H01F1/153 ,  H01F1/147 ,  C23C22/50 ,  C23C22/76 ,  C23C22/78

Abstract: [Problem] To provide: a coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which enables the achievement of excellent coating properties including high coating tension and excellent corrosion resistance even without using a chromium compound; a grain-oriented electrical steel sheet; and a method for producing a grain-oriented electrical steel sheet. [Solution] A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum.

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.

公开(公告)号：US20250132614A1

公开(公告)日：2025-04-24

申请号：US18691774

申请日：2022-10-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu HIRAYAMA ,  Kazutoshi TAKEDA ,  Takeaki WAKISAKA ,  Shuichi YAMAZAKI

IPC: H02K1/12 ,  H02K1/02

Abstract: An electrical steel sheet includes an annular body. At least one of a plurality of adhesion layers (41) is a first adhesion layer. In one of two electrical steel sheets sandwiching the first adhesion layer in a stacking direction, when an imaginary axis intersecting with a central axis of the annular body and extending in an easy-magnetization direction is defined as an L-axis, an imaginary axis intersecting with the central axis and intersecting with the L-axis is defined as a C-axis, and the electrical steel sheet is partitioned into a plurality of sections(S) in a circumferential direction of the annular body by the L-axis and the C-axis, at least one of the plurality of sections(S) is a first section. In the first section, an area of the first adhesion layer in a first portion (P1) of the electrical steel sheet where a main magnetic flux is generated in the L-axis direction is smaller than an area of the first adhesion layer in a second portion (P2) of the electrical steel sheet where the main magnetic flux is generated in the C-axis direction.

公开(公告)号：US20250109452A1

公开(公告)日：2025-04-03

申请号：US18978989

申请日：2024-12-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi YAMAZAKI ,  Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C21D9/46 ,  C23C22/50 ,  C23C22/76 ,  C23C22/78 ,  H01F1/147 ,  H01F1/153

Abstract: A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum, a method for producing a grain-oriented electrical steel sheet comprising applying the coating liquid to a grain-oriented electrical steel sheet after final annealing, and then performing a baking treatment, and a grain-oriented electrical steel sheet.

公开(公告)号：US20250026968A1

公开(公告)日：2025-01-23

申请号：US18714379

申请日：2022-11-29

Applicant: TOAGOSEI CO., LTD. ,  NIPPON STEEL CORPORATION

Inventor： Yoshiaki IWASE ,  Mikako ARAI ,  Makoto NIWA ,  Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Yoshiaki NATORI

IPC: C09J133/10 ,  C09J11/06

Abstract: An anaerobic curing adhesive composition of the disclosure contains a compound having an aromatic ring and an ethylenically unsaturated group, a polymer or an oligomer having two or more (meth)acryloyl groups in one molecule, a radical polymerization initiator, and an anaerobic curing catalyst.

公开(公告)号：US20240379265A1

公开(公告)日：2024-11-14

申请号：US18688684

申请日：2022-09-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Yoshiaki NATORI ,  Hiroyasu FUJII ,  Shinsuke TAKATANI

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

Abstract: A non-oriented electrical steel sheet 1 of the present embodiment is provided with a base metal steel sheet 10 and an insulating coating film 20 formed on the surface of the base metal steel sheet 10. The insulating coating film 20 contains metal phosphate, organic resin, and nitrite. The insulating coating film 20 has a nitrogen content of 0.05-5.00% by mass.

公开(公告)号：US20240183012A1

公开(公告)日：2024-06-06

申请号：US18285451

申请日：2022-04-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Takashi KATAOKA ,  Shinsuke TAKATANI ,  Yuuki KOGAKURA ,  Yuki KUNITA

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

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C22C38/001 ,  C22C38/004 ,  C22C38/04 ,  C22C38/06 ,  C21D2201/05

Abstract: This grain-oriented electrical steel sheet includes: a base steel sheet; and an insulating coating formed on a surface of the base steel sheet, in which the insulating coating includes an intermediate layer formed on a base steel sheet side and containing a crystalline metal phosphate, and a tension coating layer formed on a surface side of the insulating coating, an average thickness of the intermediate layer is 0.3 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, the crystalline metal phosphate of the intermediate layer is one or two or more of zinc phosphate, manganese phosphate, iron phosphate, and zinc calcium phosphate, the tension coating layer contains a metal phosphate and silica, and an amount of the silica in the tension coating layer is 20 to 60 mass %.

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：US20240035131A1

公开(公告)日：2024-02-01

申请号：US18283152

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki NATORI ,  Hiroyoshi YASHIKI ,  Minako FUKUCHI ,  Kazutoshi TAKEDA

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C21D8/02

CPC classification number: C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0205

Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, and in which the tensile strength is 580 MPa or more, the average grain size of a recrystallization part of base iron is 50 μm or less, and in inclusions having an equivalent circle diameter of 1 μm or more and an S content of 5 mass % or more contained in base iron, the number of inclusions having a Mg content of more than 5 mass % and a Mn content of 5 mass % or more is 5 times or more the number of inclusions having a Mg content of 5 mass % or less and a Mn content of 5 mass % or more.

公开(公告)号：US20230257622A1

公开(公告)日：2023-08-17

申请号：US18010555

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shinsuke TAKATANI ,  Minako FUKUCHI ,  Ichiro TANAKA

IPC: C09D163/00 ,  C09D5/00 ,  H01F1/18 ,  H02K1/02 ,  H02K1/06 ,  B32B15/18 ,  B32B15/04 ,  B32B7/12

CPC classification number: C09D163/00 ,  C09D5/00 ,  H01F1/18 ,  H02K1/02 ,  H02K1/06 ,  B32B15/18 ,  B32B15/043 ,  B32B7/12 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2603/00

Abstract: An electrical steel sheet used for a laminated core is an electrical steel sheet including an insulation coating 3 on a surface of a base steel sheet 2, the insulation coating being coated with a coating composition for an electrical steel sheet. The coating composition for an electrical steel sheet contains an epoxy resin, a first curing agent including an alkylphenol, and a second curing agent including either one or both of a phenol resol resin and a phenol novolac resin formulated in specific proportions.