公开(公告)号：US20250022639A1

公开(公告)日：2025-01-16

申请号：US18700221

申请日：2022-10-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki NATORI ,  Kazutoshi TAKEDA ,  Hiroyoshi YASHIKI ,  Minako FUKUCHI

IPC: H01F1/147 ,  B32B15/04 ,  B32B15/18 ,  C21D1/30 ,  C21D1/74 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60

Abstract: Provided is a non-oriented electrical steel sheet including a base steel sheet and an insulating coating film formed on a surface of the base steel sheet, wherein the base steel sheet has a chemical composition containing, in mass %, C: 0.0030% or less, Si: 3.2 to 6.5%, Mn: 0.05 to 3.5%, P: 0.005 to 0.10%, S: 0.0030% or less, Al: 1.0% of less, Ti: 0.0030% or less, B: 0.0010% or less, Mo: 0.030% or less, V: 0.0010% or less, Ca: 0 to 0.0050%, Mg: 0 to 0.0050%, and REM: 0 to 0.0050%, with a balance being Fe and impurities, and satisfying [S-5/3×Mg-4/5×Ca-1/4×REM 0].

公开(公告)号：US20240035131A1

公开(公告)日：2024-02-01

申请号：US18283152

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki NATORI ,  Hiroyoshi YASHIKI ,  Minako FUKUCHI ,  Kazutoshi TAKEDA

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

CPC classification number: C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0205

Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, and in which the tensile strength is 580 MPa or more, the average grain size of a recrystallization part of base iron is 50 μm or less, and in inclusions having an equivalent circle diameter of 1 μm or more and an S content of 5 mass % or more contained in base iron, the number of inclusions having a Mg content of more than 5 mass % and a Mn content of 5 mass % or more is 5 times or more the number of inclusions having a Mg content of 5 mass % or less and a Mn content of 5 mass % or more.

公开(公告)号：US20220021248A1

公开(公告)日：2022-01-20

申请号：US17311821

申请日：2020-01-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki NATORI ,  Hiroyoshi YASHIKI ,  Miho TOMITA

IPC: H02K1/02 ,  C22C38/58 ,  C22C38/50 ,  C22C38/42 ,  C22C38/34 ,  C22C38/28 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H02K5/04 ,  H02K1/12 ,  H02K1/22

Abstract: A non-oriented electrical steel sheet has a chemical composition containing, in terms of % by mass, C: 0.0015% or less and Si: 2.5 to 4.0% and having an average crystal grain size of 10 to 40 μm, and an internal oxidation layer having a thickness of 0.5 to 3.0 μm present in a sheet thickness direction of a surface thereof.

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：US20200040423A1

公开(公告)日：2020-02-06

申请号：US16606107

申请日：2018-07-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki NATORI ,  Kazutoshi TAKEDA ,  Hiroyoshi YASHIKI ,  Miho TOMITA ,  Hiroshi FUJIMURA ,  Takeaki WAKISAKA ,  Tesshu MURAKAWA ,  Takuya MATSUMOTO ,  Hiroki HORI ,  Yuuya GOHMOTO ,  O UYAMA

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

Abstract: A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0040%; Si: 3.5% to 4.5%; Al: 0.65% or less; Mn: 0.2% to 2.0%; Sn: 0% to 0.20%; Sb: 0% to 0.20%; P: 0.005% to 0.150%; S: 0.0001% to 0.0030%; Ti: 0.0030% or less; Nb: 0.0050% or less; Zr: 0.0030% or less; Mo: 0.030% or less; V: 0.0030% or less; N: 0.0010% to 0.0030%; O: 0.0010% to 0.0500%; Cu: less than 0.10%; Ni: less than 0.50%; and a remainder including Fe and impurities, in which a product sheet thickness is 0.10 mm to 0.30 mm, an average grain size is 10 μm to 40 μm, an iron loss W10/800 is 50 W/Kg or less, a tensile strength is 580 MPa to 700 MPa, and a yield ratio is 0.82 or more.

公开(公告)号：US20230139246A1

公开(公告)日：2023-05-04

申请号：US17918570

申请日：2021-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

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

Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass%, C: 0.0010 to 0.0040%, Si: 4.0 to 5.0%, Mn: 0.20% or less Al: 0.010% or more and less than 0.050%, P: 0.030% or less, S: 0.0030% or less, N: 0.0005 to 0.0030%, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 µm in a depth direction of the base metal.

公开(公告)号：US20210301363A1

公开(公告)日：2021-09-30

申请号：US17264207

申请日：2019-11-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

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

Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.

公开(公告)号：US20190316239A1

公开(公告)日：2019-10-17

申请号：US16470122

申请日：2018-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Kazutoshi TAKEDA ,  Susumu MUKAWA ,  Takuya MATSUMOTO ,  Koji FUJITA ,  Takashi MOROHOSHI ,  Masafumi MIYAZAKI

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

Abstract: A non-oriented electrical steel sheet according to an aspect of the present invention contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.2% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, one or more of La, Ce, Pr, and Nd: 0.0005% to 0.0200% in total, Ca: 0.0005% to 0.0100%, Ti: 0.0005% to 0.0100%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which Si−0.5×Mn: 2.0% or more, and Si+0.5×Mn: 3.8% or more.

公开(公告)号：US20250037912A1

公开(公告)日：2025-01-30

申请号：US18274154

申请日：2022-02-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: H01F1/147 ,  C21D1/74 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60

Abstract: This non-oriented electrical steel sheet includes a base material having a chemical composition containing, by mass %, C: 0 to 0.0050%, Si: 3.8 to 4.9%, Mn: 0.05 to 1.20%, sol. Al: more than 0.02% and 0.50% or less, P: 0 to 0.030%, S: 0 to 0.0030%, N: 0 to 0.0030%, Ti: 0% or more and less than 0.0050%, Nb: 0% or more and less than 0.0050%, Zr: 0% or more and less than 0.0050%, V: 0% or more and less than 0.0050%, Cu: 0% or more and less than 0.200%, Ni: 0% or more and less than 0.500%, Sn: 0 to 0.100%, Sb: 0 to 0.100%, and the balance: Fe and impurities, wherein the non-oriented electrical steel sheet satisfies [4.3≤Si+sol. Al+0.5×Mn≤5.0], [B50(0°)−B50(45°)≤0.16], and [B50(0°)+2×B50(45°)+B50(90°)/4≥1.57], and has tensile strength of 580 MPa or greater.

公开(公告)号：US20230137498A1

公开(公告)日：2023-05-04

申请号：US17918567

申请日：2021-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

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

Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass %, C: 0.0010 to 0.0040%, Si: 3.5 to 4.9%, Mn: 0.05 to 0.20%, Al: 0.05 to 0.45%, P: 0.030% or less, S: 0.0030% or less, N: 0.0030% or less, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, and satisfying [4.0≤Si+Al≤5.0], in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 μm in a depth direction of the base metal.