公开(公告)号：US20220372600A1

公开(公告)日：2022-11-24

申请号：US17770709

申请日：2020-10-12

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Nobuko NAKAGAWA ,  Yoshihiko ODA ,  Tomoyuki OKUBO ,  Chiyoko TADA

IPC: C22C38/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C21D9/46 ,  C21D8/02

Abstract: A non-oriented electrical steel sheet produced by hot-rolling a steel slab containing Si: 2.8 to 6.5 mass % and Zn: 0.0005 to 0.0050 mass % followed by cold rolling and finish annealing, a coating agent containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi is applied to the surface after annealing forming an insulation coating with nitriding-suppressing ability. Alternatively, an intermediate layer containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having a nitriding-suppressing ability forms on the steel sheet iron matrix after the annealing and forms an insulation coating, without above elements, on the intermediate layer thus obtaining a non-oriented electrical steel sheet wherein a high strength rotor core with and stator core with excellent magnetic is simultaneously obtained, and a motor core including a stator core and rotor core from the steel sheet.
In a production of a non-oriented electrical steel sheet by hot-rolling a steel slab containing Si: 2.8 to 6.5 mass % and Zn: 0.0005 to 0.0050 mass % followed by cold rolling and finish annealing, a coating agent containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi is applied to the steel sheet surface after the finish annealing to form an insulation coating with a nitriding-suppressing ability. Alternatively, an intermediate layer containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having a nitriding-suppressing ability is formed on the steel sheet iron matrix after the finish annealing and form an insulation coating not containing above elements is formed on the intermediate layer thus to obtain a non-oriented electrical steel sheet from which a rotor core with high strength and stator core with excellent magnetic properties after the stress-relief annealing can be obtained at the same time, and a motor core comprising a stator core and rotor core is produced from the steel sheet.

公开(公告)号：US20230002908A1

公开(公告)日：2023-01-05

申请号：US17754950

申请日：2020-10-13

Applicant: JFE STEEL CORPORATION

Inventor： Nobuko NAKAGAWA ,  Chiyoko TADA ,  Naoki MURAMATSU

IPC: C23C22/50 ,  C09D183/04 ,  C08K3/36 ,  C09D7/61

Abstract: Disclosed is an electrical steel sheet with an insulating coating formed by applying a surface-treatment agent to at least one surface of the electrical steel sheet and drying the surface-treatment agent, wherein the surface-treatment agent contains: certain trialkoxysilane and/or dialkoxysilane (A); a silane coupling agent (B) that does not contain a polymerizable unsaturated group in its structure; plate-like silica (C); a polymerizable unsaturated-group-containing compound (D); and water, within a range satisfying the following conditions (1) to (3): (1) a mass ratio (A/B) of (A) to (B) is from 0.05 to 1.00; (2) a content of (C) is 2 mass % to 30 mass % with respect to a total mass of (A) to (D) in the surface-treatment agent; and (3) a content of (D) is 2 mass % to 18 mass % with respect to the total mass of (A) to (D) in the surface-treatment agent.

公开(公告)号：US20190160786A1

公开(公告)日：2019-05-30

申请号：US16321296

申请日：2017-08-01

Applicant: JFE STEEL CORPORATION

Inventor： Nobuko NAKAGAWA ,  Naoki MURAMATSU ,  Chiyoko TADA ,  Kengo NAKAMURA ,  Tomonori SUGISHITA

IPC: B32B15/092 ,  C09D201/08 ,  B32B27/38 ,  B32B15/18

Abstract: An electromagnetic steel sheet coated with an insulating film with excellent hardness and suitable for use as a material for iron cores of large-sized electric-power generators; and a process for producing the electromagnetic steel sheet coated with an insulating film. The purpose is achieved with a coating material for forming insulating films, the coating material including a solvent and components (A) to (C) contained therein in the respective amounts on a solid basis. (A) A water-compatible carboxylated resin; 100 parts by mass. (B) An aluminum-containing oxide; more than 40 parts by mass but less than 300 parts by mass per 100 parts by mass of the component (A). (C) At least one crosslinking agent selected from the group containing of melamine, isocyanates, and oxazoline; 100 parts by mass or more but less than 300 parts by mass per 100 parts by mass of the component (A).

公开(公告)号：US20170117758A1

公开(公告)日：2017-04-27

申请号：US15318359

申请日：2015-07-24

Applicant: JFE STEEL CORPORATION

Inventor： Nobuko NAKAGAWA ,  Kazumichi SASHI ,  Naoki MURAMATSU ,  Chiyoko TADA

IPC: H02K1/02 ,  B32B15/18 ,  C23C26/00 ,  B23K20/02 ,  B05D7/14 ,  H02K15/02 ,  H01F1/18 ,  B32B15/04 ,  B05D3/02

CPC classification number: H02K1/02 ,  B05D3/0254 ,  B05D7/14 ,  B23K20/023 ,  B23K2101/18 ,  B23K2101/36 ,  B32B15/011 ,  B32B15/04 ,  B32B15/043 ,  B32B15/08 ,  B32B15/098 ,  B32B15/18 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/202 ,  B32B2307/206 ,  B32B2307/536 ,  B32B2307/542 ,  B32B2307/714 ,  B32B2307/748 ,  B32B2457/00 ,  B32B2605/08 ,  C21D8/1283 ,  C23C26/00 ,  H01F1/18 ,  H02K15/02

Abstract: A stacked electrical steel sheet used for a stacked iron core of an automotive motor and the like required to have high-temperature bond property and high-temperature oil resistance is provided. An electrical steel sheet for stacking includes: an electrical steel sheet; and a bond-type insulating coating formed on at least one surface of the electrical steel sheet and having Martens hardness HM of 50 or more and less than 500.

公开(公告)号：US20220194055A1

公开(公告)日：2022-06-23

申请号：US17695096

申请日：2022-03-15

Applicant: JFE STEEL CORPORATION

Inventor： Nobuko NAKAGAWA ,  Naoki MURAMATSU ,  Chiyoko TADA ,  Kengo NAKAMURA ,  Tomonori SUGISHITA

IPC: B32B15/092 ,  C09D201/08 ,  C08G59/40 ,  C08G59/50 ,  C08G59/14 ,  C09D163/00 ,  C23C26/00 ,  C09D163/10 ,  B32B15/18 ,  B32B27/38

Abstract: An electromagnetic steel sheet coated with an insulating film with excellent hardness and suitable for use as a material for iron cores of large-sized electric-power generators; and a process for producing the electromagnetic steel sheet coated with an insulating film. The purpose is achieved with a coating material for forming insulating films, the coating material including a solvent and components (A) to (C) contained therein in the respective amounts on a solid basis. (A) A water-compatible carboxylated resin; 100 parts by mass. (B) An aluminum-containing oxide; more than 40 parts by mass but less than 300 parts by mass per 100 parts by mass of the component (A). (C) At least one crosslinking agent selected from the group containing of melamine, isocyanates, and oxazoline; 100 parts by mass or more but less than 300 parts by mass per 100 parts by mass of the component (A).

公开(公告)号：US20220106689A1

公开(公告)日：2022-04-07

申请号：US17430626

申请日：2019-09-26

Applicant: JFE STEEL CORPORATION

Inventor： Naoki MURAMATSU ,  Nobuko NAKAGAWA ,  Chiyoko TADA

IPC: C23C22/20 ,  C09D201/00

Abstract: An electrical steel sheet having excellent coating peel resistance that can be exhibited during a stamping process, so that sticking of the coating to a die is inhibited. The electrical steel sheet has an insulating coating disposed on at least one surface of the electrical steel sheet. The insulating coating (i) includes a composite comprising P and Al, (ii) has an aspect ratio in a range of 1 to 10, and (iii) has a thickness in a range of 500 nm to 2000 nm. The composite has a particle diameter in a range of 10 nm to 1000 nm.

公开(公告)号：US20210324491A1

公开(公告)日：2021-10-21

申请号：US17273179

申请日：2019-07-08

Applicant: JFE STEEL CORPORATION

Inventor： Chiyoko TADA ,  Nobuko NAKAGAWA ,  Takashi WADA ,  Shota TSUJI ,  Naoki MURAMATSU

IPC: C21D9/46 ,  C22C38/06 ,  B05D1/02 ,  B05D3/02 ,  B05D1/28 ,  C22C38/02 ,  C22C38/04

Abstract: An electrical steel sheet with an insulating film having excellent chromium elution resistance, even in the case where the insulating film is baked by utilizing rapid heating, which improves productivity, and a method for manufacturing the steel sheet. The insulating film contains Fe, Cr, an organic resin, and an organic reducing agent on at least one surface of an electrical steel sheet. A ratio of the Fe content to the Cr content (Fe/Cr) is 0.010 to 0.6 in terms of molar ratio in the insulating film.

公开(公告)号：US20250115982A1

公开(公告)日：2025-04-10

申请号：US18729167

申请日：2023-01-23

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Takeshi NISHIYAMA ,  Nobuko NAKAGAWA ,  Tomoyuki OKUBO

IPC: C22C38/02 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10

Abstract: Provided is a non-oriented electrical steel sheet with low high-frequency iron loss without addition of a large amount of alloying elements such as Cr, which causes a decrease in magnetic flux density, and without reduction of the sheet thickness, which causes a decrease in productivity. A non-oriented electrical steel sheet comprises a certain chemical composition containing 0.0005 mass % to 0.0050 mass % of Co, wherein an amount of N existing as AlN in a range from a surface of the non-oriented electrical steel sheet to a depth of 1/20 of a sheet thickness is 0.003 mass % or less, the surface has an oxide layer containing Fe and one or both of Al and Si, and an interface between the oxide layer and a steel substrate has an oxide film consisting of one or both of Al oxide and Si oxide.

公开(公告)号：US20250101542A1

公开(公告)日：2025-03-27

申请号：US18728222

申请日：2023-01-20

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Takeshi NISHIYAMA ,  Nobuko NAKAGAWA ,  Tomoyuki OKUBO ,  Tomohiro AOYAMA

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/30 ,  C22C38/34 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  H01F1/147

Abstract: Provided is a non-oriented electrical steel sheet with low high-frequency iron loss without addition of a large amount of alloying elements such as Cr, which causes a decrease in magnetic flux density, and without reduction of the sheet thickness, which causes a decrease in productivity. A non-oriented electrical steel sheet comprises a certain chemical composition containing 0.0005 mass % to 0.0050 mass % of Co, wherein at at least one surface of the non-oriented electrical steel sheet, an amount of N existing as AlN in a range from the surface to a depth of 1/20 of a thickness of the non-oriented electrical steel sheet is 0.003 mass % or less, and the surface has an oxide layer containing one or both of Al and Si and having a thickness of 80 nm to 200 nm.

公开(公告)号：US20230366101A1

公开(公告)日：2023-11-16

申请号：US18246183

申请日：2021-07-02

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Takeshi OMURA ,  Nobuko NAKAGAWA

IPC: C23F4/02 ,  C21D8/12

CPC classification number: C23F4/02 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D2201/05

Abstract: A grain-oriented electrical steel sheet with extremely excellent magnetic properties by removing an etching resist coating well to form narrow grooves on a metal strip surface even with low-output laser, while reducing thermal effects on the metal strip caused by laser irradiation, and a method for forming grooves on a metal strip surface, having forming an etching resist coating with 0 to 70 lightness L* on at least one side of the metal strip, irradiating laser with less than 1.5 kW output on the etching resist coating while scanning the laser in a direction that intersects a rolling direction of the metal strip to remove a portion of the etching resist coating irradiated by the laser, and etching a portion of the metal strip below the removed portion of the etching resist coating to form grooves, the lightness L* being a L* value in a CIELAB color space (CIE1976L*a*b* color space).