公开(公告)号：US20220098690A1

公开(公告)日：2022-03-31

申请号：US17421820

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/54 ,  C22C38/60 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C21D3/04 ,  H01F1/147

Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and MCl in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a mass ratio of phosphoric acid and metal compound in insulation coating forming solution is controlled.

公开(公告)号：US20220025228A1

公开(公告)日：2022-01-27

申请号：US17296583

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C09J163/00 ,  B32B7/12 ,  B32B15/01 ,  C09J151/08 ,  C09J11/06 ,  C09J133/12 ,  H02K1/12 ,  H02K15/02

Abstract: Provided is an electric motor using a laminated core in which punched electrical steel sheets are adhered to each other with a high adhesion strength. The laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered to each other by the adhesion parts, wherein the adhesion parts are provided at a plurality of positions between the electrical steel sheets, and wherein the adhesion part is a layer made of an adhesive containing any one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal/cm3)1/2.

公开(公告)号：US20240254602A1

公开(公告)日：2024-08-01

申请号：US18564043

申请日：2022-05-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Shinsuke TAKATANI ,  Masaru TAKAHASHI ,  Kazutoshi TAKEDA

IPC: C22C38/02 ,  C21D8/12

CPC classification number: C22C38/02 ,  C21D8/1283 ,  C21D2201/03 ,  C21D2201/05

Abstract: A grain-oriented electrical steel sheet includes a base steel sheet, an oxide film, and a phosphate-based coating. The phosphate-based coating includes a first crystalline phosphorus oxide whose crystal structure corresponds to Fe2P2O7 and a second crystalline phosphorous oxide whose crystal structure corresponds to Fe7(P2O7)4, and the second crystalline phosphorous oxide includes at least one element selected from a group consisting of V, W, Zr, Co, and Mo.

公开(公告)号：US20240186039A1

公开(公告)日：2024-06-06

申请号：US18285481

申请日：2022-04-06

Applicant: NIPPON STEEL CORPORATION

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

IPC: H01F1/147 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C24/10 ,  C23C26/00 ,  C23C28/04

CPC classification number: H01F1/14783 ,  C21D1/74 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C24/10 ,  C23C26/00 ,  C23C28/04 ,  C21D2201/05 ,  C22C2202/02

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, the surface of the base steel sheet has an etch pit structure, an average thickness of the intermediate layer is 0.2 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, 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：US20240034903A1

公开(公告)日：2024-02-01

申请号：US18010264

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: C09D163/10 ,  B32B15/18 ,  B32B15/01 ,  B32B33/00

CPC classification number: C09D163/10 ,  B32B15/18 ,  B32B15/011 ,  B32B33/00 ,  B32B2457/00

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 includes: an epoxy resin; an epoxy resin curing agent; and an elastomer-modified phenolic resin, in which the amount of the elastomer-modified phenolic resin is 10 parts by mass to 100 parts by mass with respect to 100 parts by mass of the epoxy resin.

公开(公告)号：US20230340291A1

公开(公告)日：2023-10-26

申请号：US18010271

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: B32B7/12 ,  C09D163/00 ,  B32B15/04 ,  B32B15/18 ,  H01F1/16 ,  H02K1/02 ,  C23C26/00

CPC classification number: C09D163/00 ,  B32B7/12 ,  B32B15/043 ,  B32B15/18 ,  C23C26/00 ,  H01F1/16 ,  H02K1/02 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/206 ,  B32B2603/00

Abstract: An electrical steel sheet that is used for laminated cores is an electrical steel sheet having an insulating coating 3 formed by applying a coating composition for an electrical steel sheet on a surface of a base material steel sheet 2, and, in the coating composition for an electrical steel sheet, an epoxy resin, a first curing agent composed of a phenolic resin including a phenol skeleton having any one or both of an alkyl group and an alkoxy group and a second curing agent of one or more selected from the group consisting of a phenolic resole resin and a phenolic novolac resin are blended at specific fractions.

公开(公告)号：US20230113264A1

公开(公告)日：2023-04-13

申请号：US17913865

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Kazutoshi TAKEDA ,  Ichiro TANAKA

IPC: H01F1/18 ,  H02K1/02 ,  H01F27/24 ,  B32B15/18 ,  B32B7/12 ,  B32B15/04 ,  C23C22/07 ,  B05D7/14

Abstract: This electrical steel sheet is an electrical steel sheet in which at least part of either or both surfaces of a base steel sheet is coated with an insulation coating having an adhesive ability, wherein a logarithmic decrement of the insulation coating in a temperature range of 25 to 100° C. is 0.3 or less.

公开(公告)号：US20220119906A1

公开(公告)日：2022-04-21

申请号：US17422048

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshihiro ARITA ,  Shunsuke OKUMURA ,  Shohji NAGANO

IPC: C21D9/46 ,  C21D8/12 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/60

Abstract: A grain-oriented electrical steel sheet of the present invention has a base steel sheet, an amorphous oxide layer formed on the base steel sheet, and a tension-insulation coating formed on the amorphous oxide layer, in which the base steel sheet contains, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80 to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0 to 0.80%, N: 0 to 0.012%, P: 0 to 0.50%, Ni: 0 to 1.00%, Sn: 0 to 0.30%, and Sb: 0 to 0.30%, a remainder is Fe and an impurity, a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 to 70, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 to 70.

公开(公告)号：US20220112573A1

公开(公告)日：2022-04-14

申请号：US17421975

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI ,  Shuichi NAKAMURA ,  Shunsuke OKUMURA ,  Shohji NAGANO

IPC: C21D9/46 ,  C22C38/34 ,  C22C38/32 ,  C22C38/24 ,  C22C38/16 ,  C22C38/14 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  H01F1/147

Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.

公开(公告)号：US20220106658A1

公开(公告)日：2022-04-07

申请号：US17421850

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Shinji YAMAMOTO ,  Fumiaki TAKAHASHI ,  Hideyuki HAMAMURA ,  Shinsuke TAKATANI ,  Masaru TAKAHASHI

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

Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.0 times or less an average thickness of the intermediate layer (4) other than the groove part (RG), and an area ratio of voids in the insulation coating (3) of the groove part (RG) is 15% or less.