公开(公告)号：US20250109467A1

公开(公告)日：2025-04-03

申请号：US18711674

申请日：2022-12-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Daisuke ITO ,  Akifumi SAKAKIBARA ,  Teruki HAYASHIDA ,  Tatsuo YOKOI ,  Kazuhisa KUSUMI

IPC: C22C38/58 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C22C38/54

Abstract: A hot-rolled steel sheet has a predetermined chemical composition, a microstructure at a location of ¼ of a sheet thickness and at a location of 100 μm from a surface comprising, in area %, one or more of martensite and tempered martensite: 95% or more in total, and ferrite, bainite and pearlite: 5% or less in total, and an average dislocation density at the location of 100 μm from the surface is 1.2 times or more of an average dislocation density at the location of ¼ of the sheet thickness.

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 %.