公开(公告)号：US20230160046A1

公开(公告)日：2023-05-25

申请号：US17909706

申请日：2021-03-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobuo YOSHIKAWA ,  Takashi ARAMAKI ,  Tetsuji FUKUZATO ,  Kazuhisa KUSUMI ,  Hisayoshi YATOH ,  Yoshinari YANO

IPC: C22C38/60 ,  C21D7/02 ,  C22C38/32 ,  C22C38/40 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C22C38/60 ,  C21D7/02 ,  C22C38/32 ,  C22C38/40 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001

Abstract: This steel sheet has a predetermined chemical composition, and, on a surface parallel to a surface at a ¼ position of a sheet thickness in a sheet thickness direction from the surface, with respect to a total area of three types of oxides of MnO, Cr2O3 and Al2O3 having a major axis of more than 1.0 μm, a total area ratio of the MnO and the Cr2O3 is 98.0% or more, and an area ratio of the Al2O3 is 2.0% or less.

公开(公告)号：US20250019810A1

公开(公告)日：2025-01-16

申请号：US18713111

申请日：2022-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Kazuhisa KUSUMI

IPC: C22C38/20 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

Abstract: This steel member has a predetermined chemical composition, in which, when a ¼ position of a thickness in a thickness direction from a surface is defined as a ¼ depth position, a metallographic structure at the ¼ depth position includes 90% or more of martensite by volume fraction, in the metallographic structure at the ¼ depth position, L49-56°/L4-12°, which is a ratio of a length L49-56° of grain boundaries having an angle of rotation of 49° to 56° to a length L4-12° of grain boundaries having an angle of rotation of 4° to 12° about a direction as a rotation axis, among grain boundaries of grains having a body-centered structure, is 1.10 or more, and a tensile strength of the steel member is more than 1.500 MPa.

公开(公告)号：US20210262073A1

公开(公告)日：2021-08-26

申请号：US17049493

申请日：2019-04-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Yoshihiro SUWA ,  Kazuo HIKIDA ,  Kazuhisa KUSUMI

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/54 ,  C22C38/50 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C21D9/46

Abstract: A steel member according to an aspect of the present invention has a predetermined chemical composition, in which a metallographic structure includes, by a volume %, 60.0% to 85.0% of martensite, 10.0% to 30.0% of bainite, 5.0% to 15.0% of residual austenite, and 0% to 4.0% of a remainder in microstructure. A length of a maximum minor axis of the residual austenite is 30 nm or longer. A number density of a carbide which exist in the steel member and has a circle equivalent diameter of 0.1 μm or more and an aspect ratio of 2.5 or less is 4.0×103 pieces/mm2 or less.

公开(公告)号：US20210156017A1

公开(公告)日：2021-05-27

申请号：US17044238

申请日：2019-04-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro FUDA ,  Toshinori MIZUGUCHI ,  Junji NAKANO ,  Yoshiharu INOUE ,  Kazuhisa KUSUMI ,  Yasuaki NAITO

IPC: C23C2/08 ,  C25F1/06 ,  C22C13/00 ,  C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C28/02

Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.

公开(公告)号：US20240117456A1

公开(公告)日：2024-04-11

申请号：US18278326

申请日：2022-03-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Kazuhisa KUSUMI

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C23C2/12 ,  C23C2/40

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0257 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C23C2/12 ,  C23C2/40

Abstract: This steel sheet includes: a base steel sheet having a predetermined chemical composition; and a scale formed on a surface of the base steel sheet, in which the base steel sheet has a decarburized layer formed on a side of an interface with the scale, the decarburized layer has an internal oxidized layer formed on the side of the interface with the scale, a depth of the decarburized layer from an interface between the base steel sheet and the scale is 90 μm or more, a depth of the internal oxidized layer from the interface is less than 30 μm, and the scale contains 80% or more of Fe by mass %.

公开(公告)号：US20230407428A1

公开(公告)日：2023-12-21

申请号：US18036253

申请日：2022-01-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Kazuhisa KUSUMI ,  Yuki SUZUKI

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C33/04 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  B32B15/01 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C38/60 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C22C33/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  B32B15/013 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C21D2261/00 ,  C21D2211/008

Abstract: This steel has a steel sheet substrate and a protective film formed on at least a part of a surface of the steel sheet substrate, the chemical composition of the steel sheet substrate is, by mass %, C: 0.25% to 0.65%, Si: 0.05% to 2.00%, Mn: 0.30% to 3.00%, P: 0.050% or less, S: 0.0100% or less. N: 0.010% or less, O: 0.010% or less, Cr: 0.05% to 1.00%, and Cu: 0.10% to 1.00%, in an X-ray analysis in which measurement is carried out using a CuKα radiation, in a case where a peak intensity at a diffraction angle (2θ) position of 36.6±0.5° is regarded as 100%, the protective film has a peak having a peak intensity of more than 250% at a diffraction angle (2θ) position of 35.5±0.5° and a tensile strength is more than 1,500 MPa.

公开(公告)号：US20230028362A1

公开(公告)日：2023-01-26

申请号：US17777574

申请日：2020-11-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazuhisa KUSUMI ,  Katsuhiro FUCHIGAMI ,  Takashi ARAMAKI ,  Hideaki IRIKAWA ,  Haruhiko EGUCHI ,  Takahisa HONDA ,  Takashi MOROHOSHI

IPC: C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

Abstract: There is provided a hot-stamped member or a steel sheet for hot stamping having a chemical composition including, in mass %, C: 0.25% or more and 0.55% or less, Si: 0.001% or more and 2.0% or less, Mn: 0.3% or more and 3.0% or less, P: 0.02% or less, S: 0.003% or less, Al: 0.005% or more and 1.0% or less, Cr: 0% or more and 1.0% or less, Mo: 0% or more and 1.0% or less, N: 0.02% or less, Ca: 0% or more and 0.0010% or less, B: 0.0005% or more and 0.01% or less, one or two or more selected from the group consisting of Ti: 0.005% or more and 0.5% or less, Nb: 0.005% or more and 0.5% or less, V: 0.005% or more and 0.5% or less, and Zr: 0.005% or more and 0.5% or less, and Ni+Cu+Sn: 0% or more and 2% or less, and a remainder consisting of Fe and impurities.

公开(公告)号：US20240270325A1

公开(公告)日：2024-08-15

申请号：US18563240

申请日：2022-05-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Shunji HIWATASHI ,  Yutaka MIKAZUKI ,  Koichi SATO ,  Takahiro AITOH ,  Kengo TAKEDA ,  Katsuya NAKANO ,  Yuri TODA ,  Shinichiro TABATA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA ,  Kazuhisa KUSUMI ,  Shingo FUJINAKA ,  Jun HAGA ,  Ryo TABATA ,  Ryoma KATO ,  Mitsuharu YAMAGATA ,  Toshiyuki NIWA ,  Hiromi ASAMA ,  Junichiro SUZUKI ,  Yasunori ITO

IPC: B62D29/00 ,  B23K11/11 ,  B23K103/04 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60

CPC classification number: B62D29/007 ,  B23K11/11 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60 ,  B23K2103/04 ,  C21D2211/002 ,  C21D2211/008

Abstract: What is provided is an automobile body in which batteries, tires, and liquids containing water and oil are removed from a public road vehicle with superior collision safety, the public road vehicle comprising at least a steel material containing a steel sheet with a tensile strength of 1180 MPa or higher, a non-ferrous metal material, and a resin material, wherein



the ratio of a mass mh (kg) of the steel sheet having a tensile strength of 1180 MPa or higher to a mass m (kg) of the automobile body is 9% or higher, and
a mass m (kg) of the automobile body and a projected area s (m2) of the automobile body from an upper side satisfy a formula (1) and a formula (2)











6

公开(公告)号：US20240269773A1

公开(公告)日：2024-08-15

申请号：US18681036

申请日：2022-08-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuaki NAITO ,  Shinichiro TABATA ,  Hideaki IRIKAWA ,  Kazuhisa KUSUMI

IPC: B23K26/322 ,  B23K33/00 ,  B23K101/18 ,  B23K101/34 ,  B23K103/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16

CPC classification number: B23K26/322 ,  B23K33/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04

Abstract: This joint component includes: a first steel member; a second steel member; and a joint portion which is formed at butted portions between the first steel member and the second steel member and includes a weld metal and a heat-affected zone, in which the first steel member includes a steel sheet substrate and an Al—Fe-based coating formed on a surface of the steel sheet substrate, and has a tensile strength of more than 1,500 MPa, and when a cross section of the weld metal in a sheet thickness direction orthogonal to an extension direction of the joint portion is defined as a measuring surface, an average Cu content in the weld metal at the measuring surface is 0.03% or more and 3.00% or less by mass %.

公开(公告)号：US20240091842A1

公开(公告)日：2024-03-21

申请号：US17768161

申请日：2019-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Soshi FUJITA ,  Jun MAKI ,  Kazuhisa KUSUMI ,  Masahiro FUDA

IPC: B21D35/00 ,  C23C2/12

CPC classification number: B21D35/007 ,  C23C2/12

Abstract: A plated steel sheet for hot stamping according to one aspect of the present invention includes a steel sheet, a plating layer formed on either surface or both surfaces of the steel sheet and having an Al content of 60 mass % or more, and a surface film layer formed on the plating layer. A thickness t of the plating layer is 10 to 60 μm. An average crystal grain diameter of the plating layer in a thickness range from an interface between the plating layer and the surface film layer to a position at ⅔ of the thickness t is 2t/3 or less and 15.0 μm or less. A surface film layer contains particles containing one or more elements selected from A group elements consisting of Sc, V, Mn, Fe, Co, Ce, Nb, Mo, and W. A total content of the A group elements is 0.01 to 10.0 g/m2. An average grain diameter of the particles containing the A group elements is 0.05 to 3.0 μm.