公开(公告)号：US11932104B2

公开(公告)日：2024-03-19

申请号：US17618265

申请日：2020-06-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Toshinori Mizuguchi ,  Masahiro Fuda ,  Akiyoshi Inoue ,  Junji Nakano ,  Yasuaki Naito

IPC: B60K15/03 ,  B60K15/077

CPC classification number: B60K15/077 ,  B60K2015/0344 ,  B60K2015/03453 ,  B60K2015/0777

Abstract: A fuel tank (10) includes: a lower panel (12) made of steel and an upper panel (11) made of steel; and at least one pillar (100) made of steel which is disposed in an interior space (V) formed by the lower panel (12) and the upper panel (11) facing each other and of which a first end portion is fixed to the lower panel (12) and a second end portion is fixed to the upper panel (11) in a state where the second end portion is disposed in a hole formed in the upper panel (11).

公开(公告)号：US11371130B2

公开(公告)日：2022-06-28

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 ,  C23C2/02 ,  C23C28/02 ,  C25F1/06 ,  C22C13/00 ,  C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  B32B15/01 ,  C22C38/58 ,  C25D5/36 ,  C25D7/06 ,  C23C28/00 ,  C23C30/00 ,  B32B15/18 ,  C25D5/50 ,  B32B15/04 ,  C25F1/02 ,  C23C2/40 ,  C23C2/04 ,  C22C38/08 ,  C22C38/18 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/20 ,  C22C38/22 ,  C22C38/16 ,  C22C38/44 ,  C22C38/46 ,  C22C38/12 ,  C22C38/24 ,  C22C38/40 ,  C22C38/14

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：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：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：US12179246B2

公开(公告)日：2024-12-31

申请号：US17044194

申请日：2019-04-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro Kubo ,  Soshi Fujita ,  Yoshiaki Nakazawa ,  Hideaki Irikawa ,  Masahiro Fuda

IPC: B21D22/02 ,  B32B15/01 ,  C21D1/673 ,  C23C2/26 ,  C23C2/28 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14

Abstract: A method of producing a hot press-formed product includes subjecting an Al-plated steel sheet having a zinc compound layer or a metallic zinc layer, as an outermost layer, provided on an Al plating layer to hot press forming using a die. The die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward the inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over the entirety of a region of a steel sheet contact surface that is adjacent to a die shoulder portion. The steel sheet contact surface is a surface located outside of the die hole and configured to contact the Al-plated steel sheet that is to be subjected to the hot press forming.

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：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.