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：US20210095368A1

公开(公告)日：2021-04-01

申请号：US16634346

申请日：2019-02-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Soshi FUJITA ,  Yuki SUZUKI ,  Masahiro FUDA ,  Jun MAKI ,  Hideaki IRIKAWA ,  Tatsuya KUBOTA

IPC: C23C2/12 ,  C22C21/02 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/60 ,  B21D22/02

Abstract: Fe-Al-based plated hot-stamped member exhibiting excellent formed part corrosion resistance and post-coating corrosion resistance and manufacturing method. The hot-stamping member includes Fe-Al-based plated layer on one or both surfaces of a base material, the base material has a predetermined steel component, Fe-Al-based plated layer has a thickness of 10 μm or more and 60 μm or less, formed by A, B, C and D layers sequentially from a surface toward the base material, and each of the four layers is a Fe-Al-based intermetallic compound containing Al, Fe, Si, Mn and Cr for predetermined contents with the balance made up of impurities, the D layer further contains Kirkendall voids each of which cross-sectional area is 3 μm2-30 μm2 for 10 pieces/6000 μm2 or more and 40 pieces/6000 μm2 or less.

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：US20220025498A1

公开(公告)日：2022-01-27

申请号：US17296897

申请日：2019-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Soshi FUJITA ,  Masahiro FUDA ,  Hideaki IRIKAWA ,  Takeshi IMAI ,  Fumio EIHARA

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/06 ,  C22C38/54 ,  C22C38/42 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C25D1/04 ,  B21D22/02

Abstract: This aluminum-plated steel sheet has a steel sheet and a plating layer formed on a surface of the steel sheet, the plating layer contains one or more A group elements selected from a group consisting of Be, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, a remainder of Al, Fe, and impurities, a thickness t of the plating layer is 10 to 60 μm, and an average grain size is 2t/3 or less and 15 μm or less in a thickness range from an outermost surface of the plating layer to a ⅔ thickness t position.

公开(公告)号：US20210395870A1

公开(公告)日：2021-12-23

申请号：US17292308

申请日：2020-02-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Kazuhisa KUSUMI ,  Kazuo HIKIDA ,  Hideaki IRIKAWA

IPC: C22C38/58 ,  C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/42 ,  C22C38/50 ,  C22C38/46 ,  C22C38/48 ,  C22C38/44 ,  C22C38/00 ,  C22C38/06 ,  C22C38/54

Abstract: The present invention has as its object the provision of a steel member and steel sheet having high tensile strength and toughness and excellent in hydrogen embrittlement resistance in a corrosive environment and methods for manufacturing the same. The steel member of the present invention has predetermined chemical constituents and has a maximum value of content of Cu in a range from the surface to a depth of 0 to 30 μm of 1.4 times the content of Cu at a depth of 200 μm.

公开(公告)号：US20200024748A1

公开(公告)日：2020-01-23

申请号：US16474512

申请日：2017-12-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Yoshiaki NAKAZAWA ,  Toshiya SUZUKI ,  Narihiko NOMURA ,  Soshi FUJITA ,  Hideaki IRIKAWA

IPC: C23C28/02 ,  C22C38/00 ,  C23C2/12 ,  C23C2/06 ,  C23C22/66 ,  B21D22/00

Abstract: Provided are a plated steel sheet for hot stamping including: a plated steel sheet body including a steel sheet and an aluminum plating layer provided on one side or both sides of the steel sheet; and a zinc-based metal soap film provided on a surface of the plated steel sheet body on a side of the aluminum plating layer and having an adhesion amount of from 7.1 to 19.8 g/m2 based on a Zn amount (when, in the plated steel sheet body, a zinc oxide film is on the surface of an aluminum plating layer, the total adhesion amount of the zinc oxide film and the zinc-based metal soap film is from 7.1 to 19.8 g/m2 based on a Zn amount.), and a method of manufacturing such a sheet. Also provided are a method of manufacturing a hot-stamped component using the plated steel sheet for hot stamping, and a method of manufacturing a vehicle using a stamped component manufactured by a method of manufacturing a hot-stamped component.

公开(公告)号：US20230166314A1

公开(公告)日：2023-06-01

申请号：US17918265

申请日：2021-04-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Soshi FUJITA ,  Yuki SUZUKI ,  Masahiro FUDA ,  Hideaki IRIKAWA ,  Masahiro KUBO ,  Naruhiko NOMURA

IPC: B21D22/20 ,  B21D53/88 ,  C21D9/46

CPC classification number: B21D22/208 ,  B21D53/88 ,  C21D9/46 ,  C23C2/12

Abstract: This manufacturing method of a hot press-formed article includes a heating step of heating an Al-plated steel sheet and a forming step of obtaining a hot press-formed article using a die after the heating step, the Al-plated steel sheet has a base steel sheet, an Al plating layer, and a coating layer, the coating layer is a metal layer containing at least one metal of Mg, Ca, V, Ti, and Zn, a metal oxide layer containing an oxide of one or more of Mg, Ca, V, Ti, and Zn, or a mixed layer including the metal layer and the metal oxide layer, the die has a hard layer on a surface, HVDie that is a surface hardness of the die at a position of the hard layer is HV1500 or more and HV3800 or less, and a temperature Tm of the Al-plated steel sheet at a start of forming and an average movement velocity V of the die in the forming step satisfy 800−(HVDie/40)≤Tm≤850−(V/4)−(HVDie/100).

公开(公告)号：US20220402015A1

公开(公告)日：2022-12-22

申请号：US17789436

申请日：2021-02-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Soshi FUJITA ,  Yuki SUZUKI ,  Masahiro FUDA ,  Hideaki IRIKAWA ,  Jun MAKI ,  Nobuo YOSHIKAWA ,  Naruhiko NOMURA

IPC: B21D39/03 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/12 ,  B21D22/02

Abstract: To solve a problem about warpage of a steel sheet due to a difference in temperature raising rate between an overlapped part and a one-sheet part. This manufacturing method includes: a step of heating an overlapped blank; a step of transferring the heated overlapped blank; and a step of performing presswork on the heated overlapped blank by using a die, in which in the heating step, when sheet thicknesses of the first and second steel sheets are set to t1 and t2, respectively, and an average heating rate at a sheet temperature from 20 to 800° C. of a portion with a total sheet thickness (t1+t2) of an overlapped portion, and that of a non-overlapped portion are set to V and v1, respectively, the total sheet thickness (t1+t2) is 2.5 to 5.0 mm, a maximum length L of the overlapped portion is 100 to 1100 mm, an area S1 of the first steel sheet, an area S2 of a portion, of the second steel sheet, which is overlapped with the first steel sheet, and the average heating rates V and v1 satisfy Expressions (1) to (3), and the heating is performed at a heating temperature and for a heating time within a specific range on a plane of coordinates defined by the heating time and the heating temperature.

公开(公告)号：US20210197525A1

公开(公告)日：2021-07-01

申请号：US16613981

申请日：2019-04-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Soshi FUJITA ,  Yuki SUZUKI ,  Masahiro FUDA ,  Jun MAKI ,  Hideaki IRIKAWA ,  Masahiro NAKATA

IPC: B32B15/01 ,  C23C2/12 ,  B21D22/02 ,  B23K31/02

Abstract: To solve the problem about the difference in temperature increasing rate between an overlapped part and a one-sheet part so as to further improve the corrosion resistance of plating after hot stamping. An overlapped blank for hot stamping includes: a first steel sheet; and at least one second steel sheet connected to a surface of the first steel sheet via a welding point and smaller in area than the first steel sheet, wherein: the first steel sheet is a plated steel sheet having an aluminum-based plated layer on both faces of the first steel sheet, and the second steel sheet is a plated steel sheet having an aluminum-based plated layer on both faces of the second steel sheet; a coating weight of the aluminum-based plated layer on the first steel sheet is W1 (g/m2) in terms of an average coating weight on both the faces; a coating weight of the aluminum-based plated layer on a surface on a side not in contact with the first steel sheet in the second steel sheet is W2 (g/m2); and each of the W1 and the W2 is within a range of 20 g/m2 or more and 120 g/m2 or less, and satisfies relationships of Expression (1) and Expression (2).

公开(公告)号：US20210164080A1

公开(公告)日：2021-06-03

申请号：US16768869

申请日：2018-12-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Soshi FUJITA ,  Yuki SUZUKI ,  Masahiro FUDA ,  Jun MAKI ,  Hideaki IRIKAWA ,  Takashi ARAMAKI ,  Tatsuya KUBOTA

IPC: C22C38/54 ,  C23C2/12 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/40 ,  C21D9/46 ,  C21D8/02 ,  C21D9/00

Abstract: An aluminum-based plated steel sheet according to an aspect of the present invention includes: a base material; an aluminum-based plating layer located above the base material; and an intermetallic compound layer that is located between the base material and the aluminum-based plating layer and contains an intermetallic compound of Al and Fe, in which the base material has a chemical component within a predetermined range, the aluminum-based plating layer contains, on average, 80 mass % or more and 97 mass % or less of Al, 3 mass % or more and 15 mass % or less of Si, 0 mass % or more and 5 mass % or less of Zn, 0 mass % or more and 5 mass % or less of Fe, 0 mass % or more and 3 mass % or less in total of one or more selected from the group consisting of Mg and Ca, and impurities so that a total amount thereof is 100 mass %, an average value of a thickness of the intermetallic compound layer is 2 μm or more and 10 μm or less, a maximum value of the thickness of the intermetallic compound layer is 10 μm or more and 25 μm or less, and a standard deviation of the thickness of the intermetallic compound layer is 2 μm or more and 10 μm or less.