公开(公告)号：US20220068526A1

公开(公告)日：2022-03-03

申请号：US17423013

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Masato MIZOKAMI ,  Shingo OKADA ,  Yoichi ZAIZEN ,  Shinji YAMAMOTO

IPC: H01F1/147 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04

Abstract: A grain-oriented electrical steel sheet according to the present invention includes a silicon steel sheet as a base steel sheet, and when an average value of amplitudes in a wavelength range of 20 to 100 μm among wavelength components obtained by performing Fourier analysis on a measured cross-sectional curve parallel to a sheet width direction of the silicon steel sheet is set as ave-AMPC100, ave-AMPC100 is 0.0001 to 0.050 μm.

公开(公告)号：US20250157708A1

公开(公告)日：2025-05-15

申请号：US18838920

申请日：2023-04-04

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato YASUDA ,  Hideyuki HAMAMURA ,  Nobusato MORISHIGE ,  Shinji YAMAMOTO ,  Kimihiko SUGIYAMA

IPC: H01F1/18 ,  B23K26/364 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: The present invention has as its object to provide grain-oriented electrical steel sheet better improved in core loss in control of magnetic domains for forming laser grooves in cold rolled steel sheet. The present invention provides grain-oriented electrical steel sheet meeting the following requirements for achieving the object:
That is, it provides grain-oriented electrical steel sheet comprising a base material steel sheet having a plurality of grooves on the surface of the steel sheet and a glass coating on the surface of the base material steel sheet, in which grain-oriented electrical steel sheet, an absolute value of an angle θ formed by a direction perpendicular to a rolling direction and a sheet thickness direction of the base material steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 μm to 300 μm, a depth D of the grooves is 10 μm to 40 μm, and a pitch P of the grooves in the rolling direction is 1.0 mm to 30 mm, and, when a thickness of the glass coating at flat parts of the surface of the base material steel sheet is t1, a glass coating thickness of deepest parts of the grooves in the recessed parts of the grooves is t2, and a glass coating thickness of side parts of the grooves is t3, the relationship of formula (1) is satisfied: (t2+t3)/2≥t1  formula (1)

公开(公告)号：US20220119907A1

公开(公告)日：2022-04-21

申请号：US17422408

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi ARAI ,  Yoshiyuki USHIGAMI ,  Hideyuki HAMAMURA ,  Shinji YAMAMOTO ,  Shunsuke OKUMURA

IPC: C21D9/46 ,  C21D8/12 ,  B23K26/352 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C28/04

Abstract: The method for manufacturing a grain-oriented electrical steel sheet is a method for manufacturing a grain-oriented electrical steel sheet including a strain region forming process of irradiating the 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) with an electron beam and forming a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1) on a surface of the base steel sheet (1), wherein, in the strain region forming process, a temperature of a central portion of the strain region (D) in the rolling direction of the base steel sheet (1) and an extension direction of the strain region (D) is heated to 800° C. or higher and 2000° C. or lower.

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.

公开(公告)号：US20220090267A1

公开(公告)日：2022-03-24

申请号：US17421762

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji YAMAMOTO ,  Yoshiyuki USHIGAMI ,  Shinsuke TAKATANI ,  Shuichi NAKAMURA

IPC: C23C22/07 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04

Abstract: A grain-oriented electrical steel sheet includes a base steel sheet which contains Si and Mn, an intermediate layer which is disposed on a surface of the base steel sheet and contains a silicon oxide as a main component, and an insulation coating which is disposed on a surface of the intermediate layer. A final-annealed film is not substantially present on a surface of the base steel sheet. In a surface layer region of grain-oriented electrical steel sheet, a Mn-depletion layer having a valley portion of a Mn content in which a Mn content is lower than an average Mn content of the base steel sheet in a region deeper than the surface layer region is provided, and a Mn-rich layer having a peak portion of a Mn content in which a Mn content is higher than that in the valley portion of the Mn content is provided in a region closer to a surface of the insulation coating than the Mn-depletion layer.

公开(公告)号：US20220090227A1

公开(公告)日：2022-03-24

申请号：US17421779

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki USHIGAMI ,  Shinji YAMAMOTO ,  Hideyuki HAMAMURA ,  Takashi KATAOKA ,  Shunsuke OKUMURA

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

Abstract: The grain-oriented electrical steel sheet according to the present embodiment 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). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M2P4O13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.)

公开(公告)号：US20220074016A1

公开(公告)日：2022-03-10

申请号：US17422244

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji YAMAMOTO ,  Yoshiyuki USHIGAMI ,  Shinsuke TAKATANI

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  H01F1/147

Abstract: This grain-oriented electrical steel sheet has a base steel sheet in which a final-annealed film is substantially not present on a surface, an intermediate layer that is disposed on a surface of the base steel sheet and mainly contains silicon oxide, and an insulation coating disposed on a surface of the intermediate layer. In the intermediate layer, a value obtained by dividing a standard deviation σ of a thickness of the intermediate layer by an average value T of the thickness of the intermediate layer is 0.500 or less.

公开(公告)号：US20200208235A1

公开(公告)日：2020-07-02

申请号：US16628930

申请日：2018-07-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji YAMAMOTO ,  Yoshiyuki USHIGAMI

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C22/03

Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which a Cr content of the insulation coating is 0.1 at % or more on average, and when viewing a cross section whose cutting direction is parallel to a thickness direction, the insulation coating has a compound layer containing a crystalline phosphide in an area in contact with the intermediate layer.

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：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.