公开(公告)号：US12084750B2

公开(公告)日：2024-09-10

申请号：US18277548

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani

IPC: C22C38/02 ,  B05D3/02 ,  B05D7/14 ,  C21D8/12 ,  C22C38/04 ,  C22C38/06 ,  C23C22/12 ,  C23C22/20

CPC classification number: C22C38/02 ,  B05D3/0254 ,  B05D7/14 ,  C21D8/1283 ,  C22C38/04 ,  C22C38/06 ,  C23C22/20 ,  B05D2202/10

Abstract: This non-oriented electrical steel sheet includes: a base steel sheet; and an insulation coating formed on a surface of the base steel sheet, in which the insulation coating contains a metal phosphate and an organic resin, a moisture content of the insulation coating is 0.003 to 0.03 wt %, and a contact angle of water on the insulation coating is 55° to 85°.

公开(公告)号：US12005487B2

公开(公告)日：2024-06-11

申请号：US17800851

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani ,  Shuichi Yamazaki

IPC: B21D28/14 ,  H01F41/02 ,  H02K15/02

CPC classification number: B21D28/14 ,  H01F41/02 ,  H02K15/02 ,  H02K15/024

Abstract: Provided is a method of manufacturing a laminated core by punching electrical steel strips including an insulation coating to obtain core single sheets and laminating the core single sheets, the method including: pressurizing two or more electrical steel strips using a guide roller to temporarily bond the electrical steel strips immediately before the punching; and obtaining the core single sheets by performing the punching after inserting the two or more electrical steel strips after the temporary bonding into a punching die.

公开(公告)号：US12119706B2

公开(公告)日：2024-10-15

申请号：US18281171

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki Natori ,  Hiroyoshi Yashiki ,  Minako Fukuchi ,  Kazutoshi Takeda

IPC: C21D9/46 ,  B21B1/22 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/60 ,  H01F1/147 ,  H02K1/02 ,  H02K15/02 ,  H02K15/12 ,  C21D1/76 ,  C22C38/58

CPC classification number: H02K1/02 ,  B21B1/22 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/60 ,  H01F1/147 ,  H02K15/02 ,  H02K15/12 ,  B21B2001/221 ,  B21B2001/225 ,  C21D1/76 ,  C22C38/58

Abstract: This non-oriented electrical steel sheet contains a base material having a chemical composition including, in mass %, Si: 3.2 to 4.5%, wherein the tensile strength is 550 MPa or more, and a ratio (P120B/Fe700B)B between a peak-to-peak height Fe700B of Fe at 700 eV and a peak-to-peak height P120B of P at 120 eV when crystal grain boundaries are measured through Auger electron spectroscopy is not more than twice a ratio (P120i/Fe700i)i between a peak-to-peak height Fe700i of Fe at 700 eV and a peak-to-peak height P120i of P at 120 eV when the inside of crystals is measured through Auger electron spectroscopy.

公开(公告)号：US11942246B2

公开(公告)日：2024-03-26

申请号：US18274385

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Minako Fukuchi ,  Yoshiaki Natori ,  Tesshu Murakawa

IPC: C21D9/46 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  H01F1/147

CPC classification number: H01F1/14775 ,  C21D1/74 ,  C21D6/001 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing α-γ transformation, and contains 0.0005% to 0.0050% of Ti, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl} orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411-011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 μm to 40.0 μm.

公开(公告)号：US11749431B2

公开(公告)日：2023-09-05

申请号：US17795432

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani ,  Shuichi Yamazaki

IPC: H01F1/18 ,  H01F41/02 ,  B32B15/01

CPC classification number: H01F1/18 ,  B32B15/011 ,  H01F41/0206

Abstract: This electrical steel sheet includes a base steel sheet, a first insulation coating formed on a first surface of the base steel sheet and having adhesiveness, and a second insulation coating formed on a second surface of the base steel sheet which is a back surface to the first surface and having adhesiveness, in which an average pencil hardness of the first insulation coating is HB or higher and 3 H or lower, and an average pencil hardness of the second insulation coating is higher than the average pencil hardness of the first insulation coating.

公开(公告)号：US12286694B2

公开(公告)日：2025-04-29

申请号：US18272727

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Minako Fukuchi ,  Yoshiaki Natori ,  Tesshu Murakawa

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/06

Abstract: A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing α-γ transformation, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl} orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411−011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 μm to 40.0 μm.

公开(公告)号：US12037511B2

公开(公告)日：2024-07-16

申请号：US17923531

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Ichiro Tanaka ,  Minako Fukuchi ,  Shinsuke Takatani ,  Shuichi Yamazaki

IPC: C09D163/00 ,  C09D7/40 ,  C09D7/61

CPC classification number: C09D163/00 ,  C09D7/61 ,  C09D7/66

Abstract: This coating composition for an electrical steel sheet is a coating composition for an electrical steel sheet containing an epoxy resin, a high-temperature curing agent, and inorganic fine particles, wherein a content of the high-temperature curing agent with respect to 100 parts by mass of the epoxy resin is 5 to 30 parts by mass, wherein the inorganic fine particles are one or more selected from metal hydroxides, metal oxides that react with water at 25° C. to become metal hydroxides and silicate minerals having a hydroxyl group, wherein the volume average particle diameter of the inorganic fine particles is 0.05 to 2.0 μm, wherein a content of the epoxy resin with respect to a total mass of the coating composition for an electrical steel sheet is 45 mass % or more, and wherein a content of the inorganic fine particles with respect to 100 parts by mass of the epoxy resin is 1 to 100 parts by mass.

公开(公告)号：US12033776B2

公开(公告)日：2024-07-09

申请号：US18276857

申请日：2022-03-30

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 ,  C23C22/03

CPC classification number: H01F1/14783 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C22/03 ,  C22C2202/02

Abstract: This non-oriented electrical steel sheet includes a base steel sheet (10); and an insulation coating (20) formed on a surface of the base steel sheet (10), in which the insulation coating (20) contains a metal phosphate and an organic resin, an arithmetic mean of a center line average roughness Ra75 of the insulation coating (20) in a rolling direction of the base steel sheet (10) and a center line average roughness Ra75 of the insulation coating (20) in a direction perpendicular to the rolling direction is 0.20 to 0.50 μm, and the amount of nitrogen in the insulation coating (20) is 0.05 to 5.00 mass %.

公开(公告)号：US12024762B2

公开(公告)日：2024-07-02

申请号：US18279161

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Minako Fukuchi ,  Yoshiaki Natori ,  Tesshu Murakawa

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

CPC classification number: C22C38/02 ,  C21D9/46 ,  C22C38/004 ,  C22C38/06 ,  H01F1/147

Abstract: A non-oriented electrical steel sheet has a chemical composition in which α-γ transformation can occur and which contains at least, in terms of mass %, at most 0.010% of C, 1.50% to 4.00% of Si, 0.0001% to 1.0% of sol. Al, at most 0.010% of S, at most 0.010% of N, and a total of 2.50% to 5.00% of at least one selected from the group consisting of Mn, Ni, and Cu, with the balance including Fe and impurities, wherein when an average grain size of {411} crystal grains is defined as d411 and an average grain size of {111} crystal grains is defined as d111, d411/d111≥1.10.