公开(公告)号：US12215398B2

公开(公告)日：2025-02-04

申请号：US17283208

申请日：2019-10-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi Yamazaki ,  Shinsuke Takatani ,  Hiroyasu Fujii ,  Kazutoshi Takeda

IPC: C23C22/50 ,  C21D8/12 ,  C21D9/46 ,  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, and 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.

公开(公告)号：US12157921B2

公开(公告)日：2024-12-03

申请号：US16975668

申请日：2019-03-19

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：US12074476B2

公开(公告)日：2024-08-27

申请号：US17293961

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Ryu Hirayama

IPC: H02K1/18 ,  B32B15/01

CPC classification number: H02K1/185 ,  B32B15/011

Abstract: In an adhesively-laminated core for a stator, a chemical component of each of electrical steel sheets includes 2.5% to 3.9% by mass of Si, an average tensile modulus of elasticity of each of adhesion parts is 2500 MPa to 5000 MPa, and when an average sheet thickness of the each of electrical steel sheets is t1 in units of mm, an average thickness of the each of adhesion parts is t2 in units of μm, and an average value of yield strengths of the each of electrical steel sheets is YP in units of MPa, a condition A of satisfying the following expressions 1, 2, and 3 or a condition B of satisfying the following expressions 3, 4, and 5 or combination thereof is satisfied.

50×t1−12≤t2≤50×t1−6  (expression 1)

0.15≤t1≤0.27  (expression 2)

0.5≤t2≤2.5  (expression 3)

0.025×YP−12≤t2≤0.025×YP−8  (expression 4)

380≤YP≤540  (expression 5)

公开(公告)号：US12068097B2

公开(公告)日：2024-08-20

申请号：US17295781

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Rei Honma ,  Ryu Hirayama ,  Kazutoshi Takeda

IPC: H01F27/245 ,  H01F27/26 ,  H02K15/02 ,  H01F27/25

CPC classification number: H01F27/245 ,  H01F27/263 ,  H02K15/024 ,  H01F27/25

Abstract: A laminated core according to an aspect of the present invention includes a plurality of electrical steel sheets stacked to each other; and a plurality of adhesion parts that are provided between the electrical steel sheets adjacent to each other in a stacking direction and adhere the electrical steel sheets to each other, in which, when viewed in the stacking direction, the plurality of adhesion parts are formed in a belt shape that extends in a first direction, the plurality of adhesion parts are arranged in a second direction orthogonal to the first direction, and an angle formed by the first direction and a rolling direction of the electrical steel sheet is 30° or more and 90° or less.

公开(公告)号：US11996231B2

公开(公告)日：2024-05-28

申请号：US17311425

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu Hirayama ,  Kazutoshi Takeda

IPC: H01F41/02 ,  H01F27/245 ,  H02K1/16 ,  H02K1/18 ,  H01F27/26

CPC classification number: H01F41/0233 ,  H01F27/245 ,  H02K1/16 ,  H02K1/18 ,  H01F27/26 ,  H02K2201/09 ,  H02K2213/03

Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part which is provided between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, in which the electrical steel sheet include an annular core back part, and a plurality of tooth parts which extend from the core back part in a radial direction of the core back part and are disposed at intervals in a circumferential direction of the core back part, an adhesion region in which the adhesion part is provided is formed in the core back part of the electrical steel sheet, and the adhesion region extends in a direction along a magnetic flux passing through a region of the electrical steel sheet in contact with the adhesion region.

公开(公告)号：US11993835B2

公开(公告)日：2024-05-28

申请号：US17421769

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Ichiro Tanaka ,  Takashi Kataoka ,  Tomoya Suenaga ,  Yuki Kunita

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C22C38/06 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0284 ,  C21D8/0289 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04

Abstract: A grain-oriented electrical steel sheet is a grain-oriented electrical steel sheet which does not have an inorganic coating containing forsterite as a main component and which includes: a base steel sheet containing a prescribed chemical component; a silicon-containing oxide layer provided on the base steel sheet; an iron-based oxide layer provided on the silicon-containing oxide layer; and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components. When the tension-insulation coating undergoes elemental analysis using a glow discharge optical emission spectrometry in a sheet thickness direction from a surface of the tension-insulation coating, a peak Si emission intensity satisfies a prescribed requirement.

公开(公告)号：US11923130B2

公开(公告)日：2024-03-05

申请号：US17312103

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahito Kamikawabata ,  Ryu Hirayama ,  Kazutoshi Takeda

IPC: H02K1/18 ,  H01F27/245 ,  H01F41/02 ,  H02K1/27

CPC classification number: H01F41/0233 ,  H01F27/245 ,  H02K1/18 ,  H02K1/27 ,  H02K2201/09 ,  H02K2213/03

Abstract: A laminated core includes: a plurality of electrical steel sheets stacked in a thickness direction, wherein the electrical steel sheet includes an annular core back part and a plurality of tooth parts protruding from the core back part toward a radial direction and arranged at intervals in a circumferential direction of the core back part, and wherein among the plurality of electrical steel sheets, the tooth parts of the electrical steel sheets located at one side on the outside in a stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, the tooth parts of the electrical steel sheets located at the other side on the outside in the stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, and the tooth parts of the electrical steel sheets located at a center part in the stacking direction are not adhered to each other.

公开(公告)号：US11866797B2

公开(公告)日：2024-01-09

申请号：US17264207

申请日：2019-11-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Yoshiaki Natori ,  Miho Tomita ,  Kazutoshi Takeda ,  Takuya Matsumoto

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

CPC classification number: C21D8/12 ,  C21D9/0012 ,  C21D9/46 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  H01F1/14775 ,  C22C2202/02

Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.

公开(公告)号：US11562840B2

公开(公告)日：2023-01-24

申请号：US16978155

申请日：2019-03-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi Kataoka ,  Ichiro Tanaka ,  Haruhiko Atsumi ,  Kazutoshi Takeda ,  Hirotoshi Tada

IPC: C21D9/46 ,  H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/20 ,  C22C38/34 ,  C22C38/60

Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet having a predetermined chemical composition; a glass coating provided on the surface of the base steel sheet; and a tension-applying insulation coating provided on the surface of the glass coating, in which linear thermal strains having, a predetermined angle (φ) with respect to a transverse direction which is a direction orthogonal to a rolling direction are periodically formed on the surface of the tension-applying insulation coating at predetermined intervals along the rolling direction, a full width at half maximum F1 on the linear thermal strain and a full width at half maximum F2 at an intermediate position between the two linear thermal strains adjacent to each other satisfy 0.00

公开(公告)号：US11021771B2

公开(公告)日：2021-06-01

申请号：US16470078

申请日：2018-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Yoshiaki Natori ,  Kazutoshi Takeda ,  Susumu Mukawa ,  Takuya Matsumoto ,  Koji Fujita ,  Takashi Morohoshi ,  Masafumi Miyazaki

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/14 ,  C22C38/06 ,  C22C38/00 ,  H01F1/16 ,  C22C38/04

Abstract: A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% to 0.050%, Ti: more than 0% and 0.0050% or less, and a remainder including Fe and impurities, in which Sn+Sb: 0.050% or less, Si−0.5×Mn: 2.0% or more, and an O content in a sheet thickness central portion excluding a surface layer portion which is a range from a front surface and a rear surface to a position of 10 μm in a depth direction is less than 0.0100%.