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：US11454542B2

公开(公告)日：2022-09-27

申请号：US17243875

申请日：2021-04-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroshi Tanei ,  Masato Sugiura ,  Shuichi Yamazaki ,  Yasumitsu Kondo

IPC: G01J5/00 ,  B21C51/00 ,  G01J5/48

Abstract: A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers (20a, 20b) is equal to or more than a predetermined temperature, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers (20a, 20b) is not equal to or more than the predetermined temperature.

公开(公告)号：US11214751B2

公开(公告)日：2022-01-04

申请号：US16327625

申请日：2017-08-24

Applicant: IDEMITSU KOSAN CO., LTD. ,  NIPPON STEEL CORPORATION

Inventor： Naoki Nagase ,  Hideo Sugii ,  Keiji Noma ,  Seikichi Kitabatake ,  Isao Noguchi ,  Takeshi Kubota ,  Shuichi Yamazaki ,  Eisuke Minematsu

IPC: C10M169/04 ,  C10M141/10 ,  C10M137/04 ,  C10M129/72 ,  C10M129/50 ,  C10M129/74 ,  C10M137/08 ,  C10N20/02 ,  C10N30/12 ,  C10N40/20

Abstract: Provided are: a metalworking oil composition having excellent workability and rust inhibiting performance, which is prepared by blending (A) at least one carboxylate selected from a polyhydric alcohol ester of a monocarboxylic acid and a monohydric alcohol ester of a polycarboxylic acid, (B) a phosphorus-containing compound, and (C) a rust inhibitor, wherein the monocarboxylic acid has 9 or more and 21 or less carbon atoms, and the content of the carboxylate is 0.6% by mass or more based on the total amount of the composition; and a metalworking method using the composition.

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：US11029212B2

公开(公告)日：2021-06-08

申请号：US16499812

申请日：2018-04-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroshi Tanei ,  Masato Sugiura ,  Shuichi Yamazaki ,  Yasumitsu Kondo

IPC: G01J5/02 ,  G01J5/00 ,  B21C51/00

Abstract: A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers (20a, 20b) is equal to or more than a predetermined temperature, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers (20a, 20b) is not equal to or more than the predetermined temperature.

公开(公告)号：US12215399B2

公开(公告)日：2025-02-04

申请号：US17440646

申请日：2020-04-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu Fujii ,  Jun Maki ,  Kazutoshi Takeda ,  Hiroyuki Mimura ,  Yusuke Kanto ,  Shuichi Yamazaki

IPC: C21D8/12 ,  H01F1/18

Abstract: A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”.

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：US11535943B2

公开(公告)日：2022-12-27

申请号：US16343452

申请日：2017-10-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Tomoya Suenaga ,  Shuichi Yamazaki ,  Masaru Takahashi

IPC: C21D3/04 ,  C23F11/18 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C23C22/00 ,  H01F1/147

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：US11474032B2

公开(公告)日：2022-10-18

申请号：US16484615

申请日：2018-04-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato Sugiura ,  Hiroshi Tanei ,  Shuichi Yamazaki ,  Yasumitsu Kondo

IPC: G01N21/35 ,  G01N33/20 ,  G01N21/71 ,  G01N21/3563 ,  G01N33/2028

Abstract: A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where at least one of spectral emissivities at one wavelength and the other wavelength that are measured by radiometers for spectral emissivity measurement (21a, 21b) is not within a predetermined range including spectral emissivities of FeO at one wavelength and the other wavelength, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where all of the spectral emissivities at one wavelength and the other wavelength that are measured by the radiometers for spectral emissivity measurement (21a, 21b) is within the predetermined range including the spectral emissivities of FeO at one wavelength and the other wavelength.