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.

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：US20240068080A1

公开(公告)日：2024-02-29

申请号：US18261885

申请日：2022-03-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi DOI ,  Kenji KOBAYASHI ,  Naomi INATOMI ,  Yuki SUZUKI ,  Soshi FUJITA ,  Masahiro FUDA

IPC: C23C2/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C23C2/28 ,  C23C2/40

CPC classification number: C23C2/12 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C23C2/28 ,  C23C2/40

Abstract: A hot-stamped product with improved delayed-fracture resistance is provided. The hot-stamped product 1 includes: a steel substrate 10; and an Al film 20 formed on the steel substrate 10, the Al film 20 including: an interface layer 21 located at the interface with the steel substrate 10 and with part of the αFe substituted by Al and Si; an intermediate layer 22 formed on the interface layer 21; and an oxide layer formed on the intermediate layer, the intermediate layer 22 including an Fe—Al—Si phase 22a with part of the αFe substituted by Al and Si, the Fe—Al—Si phase 22a including one or more elements selected from the group consisting of Zr, Ce, Y, Ta, Ni, Cu, Nb, Cr, Co, V and Ti, the oxide layer 23 including one or more elements selected from the group consisting of Be, Mg, Ca, Sr, Ba, Sc and Zn.

公开(公告)号：US20240044012A1

公开(公告)日：2024-02-08

申请号：US18277550

申请日：2021-04-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Kenta UENISHI ,  Soshi FUJITA ,  Masahiro FUDA

IPC: C23C28/04 ,  C22C38/54 ,  C22C38/50 ,  C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C23C28/042 ,  C22C38/54 ,  C22C38/50 ,  C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C22C38/005 ,  C22C38/001

Abstract: To provide a steel sheet for hot stamping suitable for manufacturing, through hot-stamping working, a component having portions with different strengths, and a hot-stamped member having portions with different strengths. A steel sheet for hot stamping according to the present invention includes, on a surface of the steel sheet: a site having a surface-treated film whose emissivity at a wavelength of 8.0 μm at 25° C. is 60% or more; and a site at which the surface-treated film is not provided, in which the surface-treated film contains carbon black, and one or more of oxides selected from a group consisting of a Zr oxide, a Zn oxide, and a Ti oxide, in which the carbon black and the oxides exist while being dispersed over the entire surface-treated film, the surface-treated film has a silica content of 0 to 0.3 g/m2, and when an adhesion amount of the carbon black and an adhesion amount of the oxides are set to XCB (g/m2) and XOxide (g/m2), respectively, an equation (1) below is satisfied.

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：US20240150901A1

公开(公告)日：2024-05-09

申请号：US18280553

申请日：2021-04-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Kenta UENISHI ,  Soshi FUJITA ,  Masahiro FUDA

IPC: C23C28/00

CPC classification number: C23C28/3455

Abstract: To provide a steel sheet for hot stamping that further improves productivity of a hot-stamped member, has excellent appearance, and has excellent spot weldability, and a hot-stamped member. A steel sheet for hot stamping according to the present invention includes, on the whole of at least one surface of the steel sheet, a surface-treated film whose emissivity at a wavelength of 8.0 μm at 25° C. is 60% or more, in which the surface-treated film contains carbon black, and one or more of oxides selected from a group consisting of a Zr oxide, a Zn oxide, and a Ti oxide, in which the carbon black and the oxides exist while being dispersed over the entire surface-treated film, the surface-treated film has a silica content of 0 to 0.3 g/m2, and when an adhesion amount of the carbon black and an adhesion amount of the oxides are set to XCB (g/m2) and XOxide (g/m2), respectively, an equation (1) is satisfied.

公开(公告)号：US20220332184A1

公开(公告)日：2022-10-20

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: B60K15/077

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：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：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.