公开(公告)号：US20220336129A1

公开(公告)日：2022-10-20

申请号：US17761971

申请日：2020-09-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shuichi YAMAZAKI ,  Takuya MATSUMOTO ,  Hiroyasu FUJII ,  Masaru TAKAHASHI

IPC: H01F1/18 ,  B05D1/02 ,  B05D1/18 ,  C09D7/61 ,  C08K3/32 ,  C09D133/08

Abstract: There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the metal phosphate contains at least aluminum as a metallic element, the organic resin has an SP value being within a range of 18.0 (MPa)0.5 or more to less than 24.0 (MPa)0.5, the water-soluble organic compound has an SP value being within a range of 19.0 (MPa)0.5 or more to less than 35.0 (MPa)0.5, and when measurement by X-ray diffractometry is performed on the insulating coating film, a degree of crystallinity of aluminum phosphate calculated from a peak from the metal phosphate is within a range of 0.5 to 5.0%.

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：US20210025021A1

公开(公告)日：2021-01-28

申请号：US16981435

申请日：2019-03-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki KAMITANI ,  Takanori TANAKA ,  Atsushi SOMA ,  Keiichi KONDO ,  Hideki MITSUNARI ,  Seiya OKADA ,  Takuya MATSUMOTO ,  Shinji YOSHIDA ,  Yuji ARAI

IPC: C21D9/08 ,  B21D41/04 ,  C21D8/10

Abstract: A seamless steel pipe heat-treatment-finishing-treatment continuous facility includes: a heat treatment apparatus; a steel pipe inspection apparatus which performs a test for a surface defect and/or an inner defect of the seamless steel pipe, the steel pipe inspection apparatus being disposed downstream of the heat treatment apparatus; a main transfer mechanism which forms a main transfer path MT for transferring the seamless steel pipe, discharged from the heat treatment apparatus, to the steel pipe inspection apparatus disposed downstream of the heat treatment apparatus; and a first forced steel pipe-temperature reduction apparatus which forcibly reduces a temperature of the seamless steel pipe on the main transfer path MT, the first forced steel pipe-temperature reduction apparatus being disposed on the main transfer path MT at a position downstream of the heat treatment apparatus and upstream of the steel pipe inspection apparatus.

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：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.

公开(公告)号：US20220341043A1

公开(公告)日：2022-10-27

申请号：US17761958

申请日：2020-09-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shuichi YAMAZAKI ,  Takuya MATSUMOTO ,  Hiroyasu FUJII ,  Masaru TAKAHASHI

IPC: C23C22/20 ,  C21D9/46

Abstract: There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the water-soluble organic compound has an SP value that is within a range of 10.0 to 20.0 (cal/cm3)1/2, the metal phosphate contains aluminum and zinc as metallic elements, and when measurement by an X-ray photoelectron spectroscopy is performed from a surface of the insulating coating film in a thickness direction of the non-oriented electrical steel sheet, a depth at which a strength of a 2p peak of zinc reaches a maximum is present closer to the surface side than a depth at which a strength of a 2p peak of aluminum reaches a maximum, and a maximum value of the strength of the 2p peak of zinc is 1 to 20 times a strength of the 2p peak of aluminum at the depth at which the strength of the 2p peak of zinc reaches a maximum.

公开(公告)号：US20210343458A1

公开(公告)日：2021-11-04

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

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：US20190316221A1

公开(公告)日：2019-10-17

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 ,  C22C38/04 ,  C22C38/00

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%.