公开(公告)号：US11866797B2

公开(公告)日：2024-01-09

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

CPC classification number: C21D8/12 ,  C21D9/0012 ,  C21D9/46 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  H01F1/14775 ,  C22C2202/02

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：US11021771B2

公开(公告)日：2021-06-01

申请号：US16470078

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

Abstract: A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% 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, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% to 0.050%, Ti: more than 0% and 0.0050% or less, and a remainder including Fe and impurities, in which Sn+Sb: 0.050% or less, Si−0.5×Mn: 2.0% or more, and an O content in a sheet thickness central portion excluding a surface layer portion which is a range from a front surface and a rear surface to a position of 10 μm in a depth direction is less than 0.0100%.

公开(公告)号：US11124854B2

公开(公告)日：2021-09-21

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：US12119706B2

公开(公告)日：2024-10-15

申请号：US18281171

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki Natori ,  Hiroyoshi Yashiki ,  Minako Fukuchi ,  Kazutoshi Takeda

IPC: C21D9/46 ,  B21B1/22 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/60 ,  H01F1/147 ,  H02K1/02 ,  H02K15/02 ,  H02K15/12 ,  C21D1/76 ,  C22C38/58

CPC classification number: H02K1/02 ,  B21B1/22 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/60 ,  H01F1/147 ,  H02K15/02 ,  H02K15/12 ,  B21B2001/221 ,  B21B2001/225 ,  C21D1/76 ,  C22C38/58

Abstract: This non-oriented electrical steel sheet contains a base material having a chemical composition including, in mass %, Si: 3.2 to 4.5%, wherein the tensile strength is 550 MPa or more, and a ratio (P120B/Fe700B)B between a peak-to-peak height Fe700B of Fe at 700 eV and a peak-to-peak height P120B of P at 120 eV when crystal grain boundaries are measured through Auger electron spectroscopy is not more than twice a ratio (P120i/Fe700i)i between a peak-to-peak height Fe700i of Fe at 700 eV and a peak-to-peak height P120i of P at 120 eV when the inside of crystals is measured through Auger electron spectroscopy.

公开(公告)号：US12283845B2

公开(公告)日：2025-04-22

申请号：US17311821

申请日：2020-01-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiaki Natori ,  Hiroyoshi Yashiki ,  Miho Tomita

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

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：US11499059B2

公开(公告)日：2022-11-15

申请号：US16482663

申请日：2018-03-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Yoshiaki Natori ,  Takuya Matsumoto ,  Hiroyoshi Yashiki

IPC: C09D7/61 ,  C09D5/24 ,  H01F1/18 ,  C09D7/40 ,  C09D1/00

Abstract: An electrical steel sheet is described, which has an insulating coating on its surface. The insulating coating is free of chromium and comprises plate-like particles of inorganic compound and a metal phosphate. The plate-like particles of inorganic compound are in the form of secondary particles, which are formed by aggregating primary particles, and present in an amount of not less than 0.1 parts by mass and not greater than 20 parts by mass, with respect to 100 parts by mass of the metal phosphate. The secondary particles have an average particle diameter of no less than 0.05 μm and no greater than 5 μm, and have a specific surface area of 1 to 80 m2/g. The primary particles have an aspect ratio of 50 to 1000. The electrical steel sheet has excellent heat resistance, corrosion resistance, appearance, and insulating properties.

公开(公告)号：US12148555B2

公开(公告)日：2024-11-19

申请号：US17259837

申请日：2019-11-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Yoshiaki Natori ,  Miho Tomita ,  Kazutoshi Takeda ,  Takuya Matsumoto

IPC: H01F1/147 ,  C21D6/00 ,  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 metal having a predetermined chemical composition satisfying the expression [Si+sol. Al+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：US11377705B2

公开(公告)日：2022-07-05

申请号：US16793670

申请日：2020-02-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Kenichi Murakami ,  Nobusato Morishige ,  Hirotoshi Tada ,  Yoshiaki Natori

IPC: C21D8/12 ,  C21D9/46 ,  H01F1/16 ,  C22C38/60 ,  C22C38/00 ,  B32B15/18 ,  B32B15/04 ,  B22D11/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%≤Si−0.5×Mn≤2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%≤Sn+Sb≤0.20%.

公开(公告)号：US11279985B2

公开(公告)日：2022-03-22

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 ,  H01F1/147 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

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：US11053574B2

公开(公告)日：2021-07-06

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.