公开(公告)号：US20230193425A1

公开(公告)日：2023-06-22

申请号：US18014466

申请日：2021-07-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Takuya MITSUNOBU ,  Mamoru SAITO ,  Yuto FUKUDA ,  Yasuto GOTO ,  Hidetoshi SHINDO ,  Fumiaki NAKAMURA ,  Koji KAWANISHI ,  Ryohei MIMURA

IPC: C22C18/04

CPC classification number: C22C18/04

Abstract: A plated steel including a plated layer on a surface of a steel, in which Expression 1 of 0≤Cr+Ti+Ni+Co+V+Nb+Cu+Mn 0.25 and Expression 2 of 0≤Sr+Sb+Pb+B+Li+Zr+Mo+W+Ag+P≤0.50 are satisfied, and Expression 3 of I(MgZn2 (41.31°))/IΣ(MgZn2)≤0.265 and Expression 6 of 0.150≤{I(MgZn2 (20.79°))+I(MgZn2 (42.24°))}/IΣ(MgZn2) are further satisfied in an X-ray diffraction pattern of a surface of the plated layer measured using Cu-Kα rays under a condition that an X-ray output is 40 kV and 150 mA.

公开(公告)号：US20210039354A1

公开(公告)日：2021-02-11

申请号：US16979820

申请日：2018-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Takuya MITSUNOBU ,  Akihiro SENGOKU ,  Kenichiro MATSUMURA

IPC: B32B15/01 ,  C22C30/02 ,  C22C30/06 ,  C23C2/12 ,  C23C2/06 ,  C22C18/04 ,  C22C38/32 ,  C22C38/28 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/28 ,  B21D22/02

Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 μm, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn2 phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 3 μm to 40 μm.

公开(公告)号：US20250109475A1

公开(公告)日：2025-04-03

申请号：US18840411

申请日：2023-02-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Kotaro ISHII ,  Kohei TOKUDA ,  Yasuto GOTO ,  Mamoru SAITO

IPC: C23C2/06 ,  C22C18/00

Abstract: This metallic coated steel includes a steel material and a metallic coating layer. The metallic coating layer has an average chemical composition including Al: 0.2% to less than 4.0%, Mg: more than 4.0% and less than 12.5%, Ca: 0.15% to less than 3.00%, Zn: 65% or more, and impurities. In an any perpendicular cross section (in a thickness direction) in the metallic coating layer, a metallurgical structure observed in a scanning electron microscope observed visual field contains, in terms of area fraction, an MgZn2 phase: 10 to 40%, an Al—Zn phase: 0 to 15%, an Al phase: (Zn

公开(公告)号：US20250109474A1

公开(公告)日：2025-04-03

申请号：US18838856

申请日：2023-02-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Mamoru SAITO ,  Yasuto GOTO ,  Fumiaki NAKAMURA

IPC: C23C2/06 ,  B32B15/01 ,  C22C18/04

Abstract: A hot-dip plated steel material has a plating layer on a surface of a steel material, in which the plating layer contains Al: more than 22.5% and 50.0% or less, Mg: more than 3.0% and 15.0% or less, Ca: 0.03 to 0.6%, Si: 0.03 to 1.0%, Fe: 2 to 25%, and a remainder consisting of Zn and impurities, and, in an X-ray diffraction pattern of a surface of the plating layer, measured under conditions in which an X-ray output is a voltage of 50 kV and a current of 300 mA using a Cu-Kα ray, I1 obtained from an X-ray diffraction peak of Al0.5Fe1.5 is 1.1 or more, and I2 obtained from X-ray diffraction peaks of Zn, Al, and MgZn2 is 0.25 or less.

公开(公告)号：US20230304136A1

公开(公告)日：2023-09-28

申请号：US18033739

申请日：2021-11-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Kotaro ISHII ,  Kohei TOKUDA ,  Yoshinari ISHIDA ,  Yasuto GOTO ,  Mamoru SAITO

IPC: C23C2/06 ,  C22C18/04

CPC classification number: C23C2/06 ,  C22C18/04

Abstract: The plated steel material is a plated steel material including a steel material and a plating layer provided on the surface of the steel material, wherein the plating layer has a predetermined average chemical composition, when the amount of Mg is % Mg and the amount of Al is % Al, % Mg/% Al is 0.80 or more, and a metal structure in a total field of view of 25,000 μm2 in a vertical cross section which is a cross section in a thickness direction of the plating layer includes 10 to 40 area % of a MgZn2 phase, 10 to 30 area % of an Al—Zn phase with a Zn content of 10% or more, 0 to 15 area % of an Al phase with a Zn content of less than 10%, and 25 area % or more of an Al/MgZn2/Zn ternary eutectic structure.

公开(公告)号：US20190390303A1

公开(公告)日：2019-12-26

申请号：US16480967

申请日：2018-01-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Jun MAKI ,  Yasuto GOTO ,  Takuya MITSUNOBU

IPC: C22C18/04 ,  B32B15/01 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: There is provided a coated steel product having a steel product and a coating layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel product, in which the Zn—Al—Mg alloy layer has a Zn phase, the Zn phase contains a Mg—Sn intermetallic compound phase, and the coating layer consists of Zn: more than 65.0%, Al: from more than 5.0% to less than 25.0%, Mg: from more than 3.0% to less than 12.5%, Sn: 0.1% to 20.0% in terms of percent (%) by mass, given amounts of optional elements, and impurities, and has a chemical composition that satisfies the following Formulas 1 to 5: Bi+In

公开(公告)号：US20220356547A1

公开(公告)日：2022-11-10

申请号：US17619268

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Mamoru SAITO ,  Jun MAKI ,  Takuya MITSUNOBU ,  Yasuto GOTO

IPC: C22C18/04 ,  B32B15/01 ,  C23C2/06 ,  C23C2/40

Abstract: A hot-dip coated steel product including: a steel product; and a coating layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel product, in which the Zn—Al—Mg alloy layer includes a Zn phase, an Al phase, and a MgZn2 phase, and contains a Mg—Sn intermetallic compound phase in the Zn phase, and the coating layer has a chemical composition satisfying a predetermined average composition, a total area proportion of the Al phase and the MgZn2 phase is 70% or more, an area proportion of the Zn phase is 30% or less, an average value of cumulative circumferential lengths of the Al phase is less than 88 mm/mm2, and a total frequency in number of the Al phase having a circumferential length of 50 μm or more is less than 100.

公开(公告)号：US20220152983A1

公开(公告)日：2022-05-19

申请号：US17435613

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI ,  Kohei TOKUDA

IPC: B32B15/01 ,  C22C38/04 ,  C22C38/02 ,  C22C18/00 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40

Abstract: A plated steel includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%. Fe: 5.00% to 40.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder of Zn and impurities, and in a cross section of the plating layer, the area fraction of a Zn solid-solution Fe2Al5 phase in which 5% or more of Zn is solid-soluted is 10% to 60% and the area fraction of a MgZn2 phase is 10% to 90%.

公开(公告)号：US20220119921A1

公开(公告)日：2022-04-21

申请号：US17427544

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI ,  Kohei TOKUDA

IPC: C22C18/04 ,  C22C38/02 ,  C23C2/28 ,  C23C2/06 ,  B32B15/01 ,  C22C38/04 ,  C23C2/40

Abstract: A plated steel sheet having excellent chemical convertibility includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 35.00%, Si: 0% to 2.00%, Ca: 0.03% to 2.00%, and a remainder consisting of Zn and impurities, and in a surface of the plating layer, the area fraction of a Fe—Al phase is 0% to 30%, the area fraction of a rod-like lamellar structure of Zn and MgZn2 is 5% to 90%, the area fraction of a massive MgZn2 phase is 10% to 70%, and the area fraction of a remainder is 10% or less.

公开(公告)号：US20250163557A1

公开(公告)日：2025-05-22

申请号：US18874145

申请日：2023-06-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Masaaki URANAKA ,  Kohei TOKUDA

IPC: C23C2/06 ,  C22C18/04

Abstract: This plated steel sheet includes a steel sheet, and a plated layer disposed on a surface of the steel sheet, in which the plated layer has a chemical composition containing, in mass %, Al: 10.0 to 25.0%, Mg: 3.0 to 10.0%, Fe: 0.01 to 2.0%, and Si: more than 0 to 2.0%, with a remainder including Zn and impurities, and a number density of Mg2Si phases having a major axis of 2 μm or more exposed on the surface of the plated layer is 3 to 150 per area of 10,000 μm2.