公开(公告)号：US20210082606A1

公开(公告)日：2021-03-18

申请号：US16772544

申请日：2019-01-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hideyuki HAMAMURA ,  Satoshi ARAI

IPC: H01F1/147 ,  C21D8/12

Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.

公开(公告)号：US20200381150A1

公开(公告)日：2020-12-03

申请号：US16971617

申请日：2019-02-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Satoshi ARAI ,  Takashi KATAOKA ,  Shunsuke OKUMURA

IPC: H01F1/147 ,  C22C38/02 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B23K26/364

Abstract: A grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a groove formed on a surface, in which, in a cross section of the grain-oriented electrical steel sheet orthogonal to the groove, a KAM value is 0.1 or more and 3.0 or less in a region on a central side in a thickness direction of the grain-oriented electrical steel sheet with respect to the groove, the region being surrounded by a square having one side in contact with a groove bottom of the groove and having a length of 50 μm in each side.

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：US20210074456A1

公开(公告)日：2021-03-11

申请号：US16961286

申请日：2019-02-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi ARAI ,  Hideyuki HAMAMURA ,  Shunsuke OKUMURA ,  Kimihiko SUGIYAMA

IPC: H01F1/147 ,  C22C38/60 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K26/364

Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves. An average protrusion height of the surface protrusion extending along a longitudinal direction of the groove is more than 5 μm and not more than 10 μm. When the surface protrusion is viewed in a cross section including the longitudinal direction of the groove and a normal direction of the steel sheet surface, the surface protrusion includes specific portions each having a height of 50% or more with respect to a height of each peak point appearing on a profile line of the surface protrusion. In the longitudinal direction of the groove, the total length of the specific portions is a length of 30% or more with respect to an overall length of the surface protrusion.

公开(公告)号：US20220127692A1

公开(公告)日：2022-04-28

申请号：US17424079

申请日：2020-01-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi ARAI ,  Masataka IWAKI ,  Masato MIZOKAMI ,  Hideyuki HAMAMURA ,  Takeo ARAMAKI ,  Hirotoshi TADA

IPC: C21D10/00 ,  C21D9/46 ,  H01F1/147

Abstract: A grain-oriented electrical steel sheet includes: a steel sheet and optionally an insulation coating formed on the steel sheet, in which, in a case where a heat treatment of performing retention at 800° C. for 2 hours is performed, regarding a time-magnetostriction waveform (t−λ waveform) when magnetized to 1.7 T, a peak value of a difference waveform obtained by subtracting the time-magnetostriction waveform after the heat treatment from the time-magnetostriction waveform before the heat treatment is 0.01×10−6 or more and 0.20×10−6 or less, and a difference obtained by subtracting an iron, loss before the heat treatment from an iron loss after the heat treatment is 0.03 W/kg or more and 0.17 W/kg or less.

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.