公开(公告)号：US20240183012A1

公开(公告)日：2024-06-06

申请号：US18285451

申请日：2022-04-06

Applicant: NIPPON STEEL CORPORATION

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

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

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C22C38/001 ,  C22C38/004 ,  C22C38/04 ,  C22C38/06 ,  C21D2201/05

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, an average thickness of the intermediate layer is 0.3 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, the crystalline metal phosphate of the intermediate layer is one or two or more of zinc phosphate, manganese phosphate, iron phosphate, and zinc calcium phosphate, 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：US20220090241A1

公开(公告)日：2022-03-24

申请号：US17422517

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takashi KATAOKA ,  Kazutoshi TAKEDA ,  Tomoya SUENAGA ,  Yuki KUNITA

IPC: C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C21D8/02 ,  C21D3/04 ,  C21D9/46 ,  H01F1/147

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When the iron oxide layer is analyzed by a fourier transform infrared spectroscopy, an absorbance A650 at 650 cm−1 and an absorbance A1250 at 1250 cm−1 satisfy 0.2≤A650/A1250≤5.0. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

公开(公告)号：US20230402220A1

公开(公告)日：2023-12-14

申请号：US18033090

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Shinji YAMAMOTO ,  Takeo ARAMAKI ,  Yuki KUNITA ,  Satoshi ARAI

IPC: H01F27/245 ,  C22C38/02 ,  H01F1/147

CPC classification number: H01F27/2455 ,  C22C38/02 ,  H01F1/14783

Abstract: This wound core is a wound core including: a substantially rectangular wound core main body in a side view in which first planar portions and corner portions are alternately continuous and at least one of two or more bent portions existing in at least one corner portion satisfies Equations (1) to (3) below.


Tave≤40 nm  (1)



(To−Tu)/Tave≤0.50  (2)



Tave(To−Tu)≤240 nm2  (3)

公开(公告)号：US20240158895A1

公开(公告)日：2024-05-16

申请号：US18284263

申请日：2022-04-06

Applicant: NIPPON STEEL CORPORATION

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

IPC: C22C38/02 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C23C22/07

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/004 ,  C22C38/04 ,  C23C22/07

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 base steel sheet includes an iron-based oxide layer containing an iron-based oxide on an insulating coating side, 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, an average thickness of the iron-based oxide layer is 0.10 to 1.50 μm, an average thickness of the intermediate layer is 0.3 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, the crystalline metal phosphate of the intermediate layer is one or two or more of zinc phosphate, manganese phosphate, iron phosphate, and zinc calcium phosphate, 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：US20220098692A1

公开(公告)日：2022-03-31

申请号：US17421845

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Ichiro TANAKA ,  Tomoya SUENAGA ,  Takashi KATAOKA ,  Yuki KUNITA

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C22/18 ,  C23C22/20 ,  C23C22/74 ,  C23C28/04 ,  C23G1/08

Abstract: The 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, including a base steel sheet having a predetermined 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 elemental analysis is performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry, predetermined requirements are satisfied.

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：US20220090239A1

公开(公告)日：2022-03-24

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

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.