公开(公告)号：US20230392225A1

公开(公告)日：2023-12-07

申请号：US18269435

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato MORISHIGE ,  Takeru ICHIE ,  Masato YASUDA ,  Masahide URAGO ,  Fuminobu MURAKAMI ,  Daichi HAMADA ,  Atsushi SHIBAYAMA ,  Kazumi MIZUKAMI ,  Daisuke ITABASHI

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

CPC classification number: C21D8/1222 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/002 ,  C21D8/1233 ,  C21D8/1272 ,  C21D8/1277 ,  C21D9/46

Abstract: There is provided a non-oriented electrical steel sheet in which, in a cross section of a base material in a sheet thickness direction, the number density N2-5 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range of 2.0 to 5.0 μm from the surface of the base material in the sheet thickness direction is 0.30 pieces/μm2 or less, and the relationship between the number density N2-5 and the number density N0-2 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range from the surface of the base material to 2.0 μm satisfies Formula (1):


(N2-5)/(N0-2)≤0.5  Formula (1).

公开(公告)号：US20230013043A1

公开(公告)日：2023-01-19

申请号：US17782005

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE ,  Yoshihiro ARITA

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

Abstract: A hot-rolled steel sheet for non-oriented electrical steel sheets includes, by mass %: 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: 0.100% or less; S: 0.005% or less; N: 0.0040% or less; B: 0.0060% or less; Sn: 0% to 0.50%; Sb: 0% to 0.50%; Cu: 0% to 0.50%; REM: 0% to 0.0400%; Ca: 0% to 0.0400%; Mg: 0% to 0.0400%; and a remainder including Fe and impurities, in which a hardness HD of a deformed structure of a thickness middle portion (½t position) in a sheet width direction end portion of the hot-rolled steel sheet for non-oriented electrical steel sheets is Hv 220 or less.

公开(公告)号：US20220145418A1

公开(公告)日：2022-05-12

申请号：US17437726

申请日：2019-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE ,  Masaru TAKAHASHI ,  Fuminobu MURAKAMI ,  Shinichi MATSUI ,  Masahiro YAMAMOTO

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H01F41/02

Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet contains Si, Al, and Mn as chemical composition, and an alignment degree to {5 5 7} orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.

公开(公告)号：US20230046884A1

公开(公告)日：2023-02-16

申请号：US17789473

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE

IPC: C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147

Abstract: What is provided is a steel sheet for a non-oriented electrical steel sheet containing, in mass %, C: 0.0040% or less, Si: 1.9% or more and 3.5% or less, Al: 0.10% or more and 3.0% or less, Mn: 0.10% or more and 2.0% or less, P: 0.09% or less, S: 0.005% or less, N: 0.0040% or less, B: 0.0060% or less, and the remainder consisting of Fe and impurities, in which the recrystallization rate of the structure of a sheet thickness-direction cross section at each position 10 mm apart toward the sheet width center from each of both end portions in the sheet width direction is less than 50%, and, when the sheet width is represented by W, the recrystallization rate of the structure of a sheet thickness-direction cross section at the position of ¼W from each of both end portions in the sheet width direction is 50% or more.

公开(公告)号：US20220154304A1

公开(公告)日：2022-05-19

申请号：US17437703

申请日：2019-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Masaru TAKAHASHI ,  Takeru ICHIE ,  Tesshu MURAKAWA ,  Shinichi MATSUI ,  Fuminobu MURAKAMI

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23G1/08 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet includes an internally oxidized layer containing SiO2 in a surface thereof, an average thickness of the internally oxidized layer is 0.10 to 5.0 μm, and a vickers hardness in the internally oxidized layer is 1.15 to 1.5 times as compared with a vickers hardness in a thickness central area.

公开(公告)号：US20200232059A1

公开(公告)日：2020-07-23

申请号：US16487020

申请日：2018-03-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroshi FUJIMURA ,  Takeru ICHIE ,  Yoshiaki NATORI ,  Hiroyoshi YASHIKI

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

Abstract: This non-oriented electrical steel sheet including, as a chemical composition, by mass %: C: 0.0100% or less; Si: more than 3.0% and 5.0% or less; Mn: 0.1 to 3.0%; P: 0.20% or less: S: 0.0018% or less: N: 0.0040% or less; Al: 0 to 0.9%; one or more selected from the group consisting of Sn and Sb: 0 to 0.100%; Cr 0 to 5.0%; Ni: 0 to 5.0%; Cu: 0 to 5.0%; Ca: 0 to 0.01%; rare earth elements (REM): 0 to 0.010%; and a remainder including Fe and impurities, in which an area ratio of a crystal structure A composed of crystal grains having a grain size of 100 μm or greater in a cross section parallel to a rolled surface of the non-oriented electrical steel sheet is 1 to 30%, an average grain size of a crystal structure B that is a crystal structure other than the crystal structure A is 25 μm or less, and a Vickers hardness HvA of the crystal structure A and a Vickers hardness HvB of the crystal structure B satisfy HvA/HvB≤1.000.

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.