公开(公告)号：US20220106661A1

公开(公告)日：2022-04-07

申请号：US17421857

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

IPC: C21D9/46 ,  C21D8/12 ,  C23C22/00 ,  C23G1/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where chemical-polished is conducted to control average roughness Ra, and an insulation coating forming process where insulation coating forming solution in which crystalline phosphide is included is applied.

公开(公告)号：US20220098689A1

公开(公告)日：2022-03-31

申请号：US17421802

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

IPC: C21D9/46 ,  C23G1/08 ,  C21D8/02 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60

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 hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where chemical-polished is conducted to control average roughness Ra, and an insulation coating forming process where insulation coating forming solution in which crystalline phosphide is included is applied.

公开(公告)号：US20220090246A1

公开(公告)日：2022-03-24

申请号：US17422605

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

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

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 without hydrogen, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.

公开(公告)号：US20220090240A1

公开(公告)日：2022-03-24

申请号：US17421774

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Shunsuke OKUMURA ,  Shohji NAGANO

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

Abstract: A method of manufacturing a grain-oriented electrical steel sheet according to the present invention includes a process of executing hot rolling on a slab to obtain a hot-rolled sheet; a process of executing hot-rolled sheet annealing on the hot-rolled sheet to obtain an annealed hot-rolled sheet; a process of executing cold rolling on the annealed hot-rolled sheet to obtain a cold-rolled sheet; a process of executing decarburization annealing on the cold-rolled sheet to obtain a decarburization annealed sheet; a process of applying an annealing separator containing alumina as a main component to the decarburization annealed sheet; and a process of executing final annealing on the decarburization annealed sheet to which the annealing separator is applied, wherein the annealing separator contains 28% to 50% by mass of MgO, and wherein an application amount of the annealing separator is 6.0 to 14.0 g/m2 per one surface of the decarburization annealed sheet.

公开(公告)号：US20220090225A1

公开(公告)日：2022-03-24

申请号：US17421758

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji YAMAMOTO ,  Yoshiyuki USHIGAMI ,  Shinsuke TAKATANI

IPC: C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C22C38/02 ,  H01F41/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  H01F1/18 ,  C21D3/04 ,  C21D6/00

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, an intermediate layer that is formed on a surface of the base steel sheet and mainly contains silicon oxide, and an insulation coating that is formed on the surface of the intermediate layer. A number density of the oxide particles in a region from the surface of the base steel sheet to a depth of 10 μm toward an inside of the base steel sheet is 0.020 oxide particles/μm2 or less. In the grain-oriented electrical steel sheet, an area rate of an intermediate layer-remaining region n which the intermediate layer does not peel off but remains in a region in which the insulation coating peels off after a bend test performed using a mandrel according to JIS K 5600-5-1 (1999) is 20% or more.

公开(公告)号：US20240204634A1

公开(公告)日：2024-06-20

申请号：US18286534

申请日：2022-04-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shinsuke TAKATANI ,  Ryu HIRAYAMA ,  Minako FUKUCHI ,  Yoshiaki IWASE ,  Makoto NIWA ,  Makoto HIRAKAWA

IPC: H02K15/12 ,  H02K15/02

CPC classification number: H02K15/12 ,  H02K15/02 ,  H02K2201/09 ,  H02K2215/00

Abstract: This bonded and stacked core manufacturing method is a method for manufacturing a bonded and stacked core by performing press working on a strip-shaped steel sheet with a press working oil applied to one surface or both surfaces thereof, applying an anaerobic adhesive and an instantaneous adhesive to one surface of the strip-shaped steel sheet to obtain a plurality of steel sheet components, and stacking and bonding the steel sheet components, in which a curing accelerating layer is formed by applying an anaerobic adhesive curing accelerator and an instantaneous adhesive curing accelerator to one surface or both surfaces of the strip-shaped steel sheet before the press working oil is applied, and drying the adhesive curing accelerator and the instantaneous adhesive curing accelerator.

公开(公告)号：US20240035129A1

公开(公告)日：2024-02-01

申请号：US18277548

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Shinsuke TAKATANI

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

CPC classification number: C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C23C22/12 ,  C23C22/20 ,  C21D8/1283

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：US20230250323A1

公开(公告)日：2023-08-10

申请号：US18010548

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: C09J163/00 ,  C08G59/24 ,  C08G59/62 ,  C08G59/50 ,  C08G59/56 ,  C09J11/06 ,  C09J5/00 ,  H01F1/18 ,  B32B15/01 ,  B32B7/12

CPC classification number: C09J163/00 ,  C08G59/245 ,  C08G59/621 ,  C08G59/5033 ,  C08G59/5006 ,  C08G59/56 ,  C09J11/06 ,  C09J5/00 ,  H01F1/18 ,  B32B15/011 ,  B32B7/12 ,  C09J2400/166 ,  C09J2463/00 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/748 ,  B32B2307/208

Abstract: This coating composition for an electrical steel sheet contains an epoxy resin, a phenolic curing agent (A) and one or more amine-based curing agents (B) selected from the group consisting of an aromatic amine and dicyandiamide, the amount of the phenolic curing agent (A) is 1 to 40 parts by mass with respect to 100 parts by mass of the epoxy resin, and the amount of the amine-based curing agents (B) is 0.5 to 5 parts by mass with respect to 100 parts by mass of the epoxy resin.

公开(公告)号：US20230183518A1

公开(公告)日：2023-06-15

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 ,  C09D7/61 ,  C09D7/40 ,  B32B15/01

CPC classification number: C09D163/00 ,  C09D7/61 ,  C09D7/66 ,  B32B15/011 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/202 ,  B32B2307/206

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：US20220081747A1

公开(公告)日：2022-03-17

申请号：US17422390

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

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

Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where mixed gas and temperature are controlled for annealing, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.