公开(公告)号：US20230366058A1

公开(公告)日：2023-11-16

申请号：US18033376

申请日：2020-11-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro ARITA ,  Shinichi MATSUI

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21C7/00 ,  C21D8/12 ,  C21D6/00 ,  H01F1/147

CPC classification number: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21C7/0006 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C21D6/005 ,  C21D6/008 ,  H01F1/14766 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet is provided which has a chemical composition that contains, in mass%, C: 0.0050% or less, Si: 0.10 to 1.50%, Mn: 0.10 to 1.50%, sol. Al: 0.0050% or less, N: 0.0030% or less, S: 0.0040% or less, and O: 0.0050 to 0.0200%, and contains one or more elements selected from a group of La, Ce, Zr, Mg and Ca in a total amount of 0.0005 to 0.0200%, with the balance being Fe and impurities. A number density N of suitable oxide particles is 3.0×103 to 10×103 particles/cm2, and a number density n of oxide particles containing La and the like satisfies the expression n/N≥0.01.

公开(公告)号：US20220081744A1

公开(公告)日：2022-03-17

申请号：US17422219

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato YASUDA ,  Yoshihiro ARITA ,  Masaru TAKAHASHI ,  Yoshiyuki USHIGAMI ,  Shohji NAGANO

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

Abstract: Provided is a grain-oriented electrical steel sheet including a base steel sheet, an intermediate layer which is disposed in contact with the base steel sheet and mainly includes silicon oxide, and an insulation coating which is disposed in contact with the intermediate layer and mainly includes phosphate and colloidal silica, in which the base steel sheet contains predetermined chemical composition, BN having an average particle size of 50 to 300 nm is present, when an emission intensity of B is measured using glow discharge emission analysis, predetermined conditions are satisfied, and a ratio of a major axis to a minor axis of BN is 1.5 or less.

公开(公告)号：US20220368182A1

公开(公告)日：2022-11-17

申请号：US17642906

申请日：2020-10-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Shin SUENAGA ,  Yoshihiro ARITA ,  Yoshifumi OHATA ,  Takashi ARAMAKI ,  Shuji YAMAMOTO

IPC: H02K1/276 ,  H02K1/02 ,  H02K15/12 ,  H02K15/03

Abstract: A rotor is a magnet-embedded rotor incorporated in a traveling motor of a vehicle, and includes: a laminated core having steel sheets laminated to each other and a bonding layer for bonding the steel sheets adjacent to each other in a laminating direction; and a magnet embedded in the laminated core. When the rotor rotates at 11000 rpm, a maximum amount of displacement of an outer edge of the laminated core of the rotor in a radial direction is 0.1 mm or less.

公开(公告)号：US20220340991A1

公开(公告)日：2022-10-27

申请号：US17761055

申请日：2020-09-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato YASUDA ,  Takeo ARAMAKI ,  Shinya YANO ,  Yoshihiro ARITA ,  Takashi KATAOKA ,  Kenichi MURAKAMI

IPC: C21D9/46 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: [Problem] To provide a grain-oriented electrical steel sheet which is further improved in terms of iron loss before magnetic domain control, while achieving a sufficient iron loss improvement effect even in the control of a heat-resistant magnetic domain where a sufficient iron loss improvement effect has not been achieved. [Solution] A grain-oriented electrical steel sheet according to one aspect of the present invention comprises abase steel sheet and a glass coating that is formed on the surface of the base steel sheet, and is characterized in that: the base steel sheet contains as chemical components, in mass %, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% of Al, 0.004% or less of N and 0.010% or less of S, with the balance being made up of Fe and impurities; the oxygen concentration in the glass coating and the base steel sheet is 2,500 ppm or less; and if IAl_1 is the first peak intensity of Al and IAl_2 is the second peak intensity of Al in the concentration profile of Al, the relationship of mathematical formula (1) is satisfied. IAl_1

公开(公告)号：US20240093322A1

公开(公告)日：2024-03-21

申请号：US18276623

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro ARITA ,  Takeru ICHIE ,  Fuminobu MURAKAMI

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

CPC classification number: C21D8/1222 ,  C21D9/46 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A hot rolled steel sheet is for a non oriented electrical steel sheet, wherein vickers hardness at the widthwise edge is 180 Hv or more, a value obtained by subtracting a vickers hardness at the widthwise center from the vickers hardness at the widthwise edge is 10 to 100 Hv, ductile brittle transition temperature at the widthwise edge is 0° C. or less, a value obtained by subtracting the ductile brittle transition temperature at the widthwise edge from a ductile brittle transition temperature at the widthwise center is 10 to 100° C., and a value obtained by subtracting a sheet thickness at the widthwise edge from a sheet thickness at the widthwise center is 50 μm or less.

公开(公告)号：US20230063410A1

公开(公告)日：2023-03-02

申请号：US17797384

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro ARITA ,  Takeru ICHIE ,  Fuminobu MURAKAMI

IPC: C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C23G1/08

Abstract: A hot-rolled steel sheet for a non-oriented electrical steel sheet according to one aspect of the present invention contains, by mass %, C: 0.0050% or less, Si: 0.5% or more and 3.5% or less, Mn: 0.1% or more and 1.5% or less, Al: 0.1% or more and 1.5% or less, Cu: 0.01% or more and 0.10% or less, Sn: 0.01% or more and 0.20% or less, and a remainder including Fe and impurities, in which the hot-rolled steel sheet has a Cu concentration peak value of 0.12% or more in a range from a surface thereof to a depth of 10 μm.

公开(公告)号：US20220380877A1

公开(公告)日：2022-12-01

申请号：US17787201

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE ,  Yoshihiro ARITA

IPC: C22C38/60 ,  C22C38/02 ,  C21D8/12 ,  H01F1/147

Abstract: A hot-rolled steel sheet for a non-oriented electrical steel sheet containing, in mass %, components of C: 0.0010% to 0.0050%, Si: 1.90% to 3.50%, Al: 0.10% to 3.00%, Mn: 0.05% to 2.00%, P: 0.10% or less, S: 0.005% or less, N: 0.0040% or less and B: 0.0060% or less with a remainder consisting of Fe and impurities, in which, in a sheet width-direction end portion of the hot-rolled steel sheet for a non-oriented electrical steel sheet, a C concentration [atom %] in a crystal grain boundary is 3.0 or more times a P concentration [atom %], and the C concentration [atom %] in the crystal grain boundary of the hot-rolled steel sheet for a non-oriented electrical steel sheet is 3.5 or more times a C concentration in a crystal grain.

公开(公告)号：US20240295014A1

公开(公告)日：2024-09-05

申请号：US18275704

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro ARITA ,  Masahiro FUJIKURA

IPC: C22C38/02 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/004 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D2211/004 ,  C21D2211/005

Abstract: A hot rolled steel sheet for a non oriented electrical steel sheet according to the present invention includes a predetermined amount of Si, Mn, Al, Ti, Nb, V, and Zr as a chemical composition, wherein when viewing a cross section which is parallel to a rolling direction and a thickness direction, an AlN with an equivalent circle diameter of 10 to 200 nm exists in a grain and at a grain boundary of a ferrite grain, a number density of AlN which exists in the grain and at the grain boundary is 8.0 pieces/μm2 or less on the basis of an observed area, and a number density of AlN which exists at the grain boundary is 40 pieces/μm2 or less on the basis of a grain boundary area.

公开(公告)号：US20240084415A1

公开(公告)日：2024-03-14

申请号：US18284765

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Kazutoshi TAKEDA ,  Ichiro TANAKA ,  Yoshihiro ARITA ,  Hiroki HORI ,  Wataru OHASHI

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  H01F1/14775

Abstract: This non-oriented electrical steel sheet includes a base material having a chemical composition including Si: 3.7 to 4.8%, wherein a recrystallization rate is less than 100% in terms of an area fraction, the following Formula (i) and Formula (ii) are satisfied, and the tensile strength is more than 700 MPa.


4.3≤Si+sol. Al+0.5×Mn≤4.9  (i)



(B50(0°)+2×B50(45°)+B50(90°))/4≥1.57  (ii)

公开(公告)号：US20220119906A1

公开(公告)日：2022-04-21

申请号：US17422048

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshihiro ARITA ,  Shunsuke OKUMURA ,  Shohji NAGANO

IPC: C21D9/46 ,  C21D8/12 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/60

Abstract: A grain-oriented electrical steel sheet of the present invention has a base steel sheet, an amorphous oxide layer formed on the base steel sheet, and a tension-insulation coating formed on the amorphous oxide layer, in which the base steel sheet contains, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80 to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0 to 0.80%, N: 0 to 0.012%, P: 0 to 0.50%, Ni: 0 to 1.00%, Sn: 0 to 0.30%, and Sb: 0 to 0.30%, a remainder is Fe and an impurity, a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 to 70, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 to 70.