公开(公告)号：US12234538B2

公开(公告)日：2025-02-25

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 ,  B21D22/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/26 ,  C23C2/28 ,  C25D1/04

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：US11535916B2

公开(公告)日：2022-12-27

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

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.

公开(公告)号：US12227817B2

公开(公告)日：2025-02-18

申请号：US18036253

申请日：2022-01-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro Tabata ,  Kazuhisa Kusumi ,  Yuki Suzuki

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

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：US11364707B2

公开(公告)日：2022-06-21

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

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：US12163231B2

公开(公告)日：2024-12-10

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: C23C2/26 ,  B21D35/00 ,  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.

公开(公告)号：US12162057B2

公开(公告)日：2024-12-10

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 ,  C23C2/28 ,  C23C2/12 ,  C23C2/16

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：US11530474B2

公开(公告)日：2022-12-20

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 ,  B32B15/10 ,  B21D22/02 ,  C21D8/02 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/42 ,  C22C38/60 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02

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.