公开(公告)号：US20210198780A1

公开(公告)日：2021-07-01

申请号：US16755865

申请日：2017-12-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU

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

Abstract: A hot-dip galvanized steel sheet includes a plated layer formed on at least a part of a surface of a steel sheet, the plated layer containing: Al in a range from 10 mass % to 40 mass %; Si in a range from 0.05 mass % to 4 mass %; Mg in a range from 0.5 mass % to 4 mass %; and the balance consisting of Zn and inevitable impurities. The plated layer has a lamellar structure in which a layered Zn phase and a layered Al phase are alternately arranged in a cross section of the plated layer, the lamellar structure accounting for 5% or more by an area fraction in the cross section, and a total abundance ratio of an intermetallic compound containing at least one of Fe, Mn, Ti, Sn, In, Bi, Pb or B is regulated to 3% or less by the area fraction.

公开(公告)号：US20200017937A1

公开(公告)日：2020-01-16

申请号：US16493956

申请日：2018-03-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU

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

Abstract: A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass; in which the coating layer has a laminar Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al; and the laminar Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a laminar Mg2Sn phase having a thickness of less than 1 μm, and in which the laminar Mg2Sn phase exists dividing the Zn phase into plural regions.

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：US20250137098A1

公开(公告)日：2025-05-01

申请号：US18681813

申请日：2022-09-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Shota HAYASHIDA ,  Hiroshi TAKEBAYASHI

IPC: C22C18/04 ,  B32B15/01

Abstract: A hot stamped body, including: a steel material; and a plated layer, wherein a chemical composition of the plated layer contains, in mass %, 0 to 70% of Al, 10 to 60% of Fe, 0 to 20% of Si, and a C-group element being any one kind or two kinds of Li and Y, with a content of 0.00001 to 0.3% in total, and optionally further contains any one kind or two or more kinds of Sb, Pb, B, Cu, Ti, Cr, Nb, Ni, Mn, Mo, Ag, Co, Sn, and Bi, and a remainder being of Zn and an impurity, wherein the plated layer contains an n-Zn phase or a Zn-containing phase is used.

公开(公告)号：US20250065450A1

公开(公告)日：2025-02-27

申请号：US18725477

申请日：2023-01-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro MATSUBA ,  Takuya MITSUNOBU ,  Masaaki URANAKA ,  Toyomitsu NAKAMURA

IPC: B23K35/30 ,  B23K9/23 ,  B23K26/322 ,  B23K35/28 ,  B23K103/04 ,  B23K103/16

Abstract: To further improve electrodeposition coating properties in a weld bead zone.
A welded joint according to the present invention includes: a first steel sheet and a second steel sheet; and a weld bead zone formed by arc welding or laser welding, wherein at least one of the first steel sheet or the second steel sheet has a plating layer composed of a predetermined component and an oxide layer located on the plating layer in a non-heat-affected zone, and the weld bead zone has a weld metal and a slag layer formed on part of a surface of the weld metal, and the slag layer contains, by mass % when oxygen is excluded, Al: 1.0 to 45.0% and Mg: 1.0 to 30.0%, with the balance composed of Fe, easily oxidizable metallic elements, and impurities.

公开(公告)号：US20250027186A1

公开(公告)日：2025-01-23

申请号：US18714939

申请日：2022-12-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI

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

Abstract: Provided is a plated steel sheet comprising a base steel sheet and a plating layer formed on a surface of the base steel sheet, wherein the plating layer has a predetermined chemical composition, and when measuring the plating layer by glow discharge spectroscopy (GDS), a ratio of “Al concentration at center of plating layer”/“Al concentration at position of plating layer where Fe concentration is 50% of base steel sheet” is 0.10 to 1.50.

公开(公告)号：US20240227354A1

公开(公告)日：2024-07-11

申请号：US18288208

申请日：2021-04-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Keitaro MATSUDA ,  Jun MAKI ,  Takehiro TAKAHASHI ,  Hiroshi TAKEBAYASHI

IPC: B32B15/01 ,  B32B7/14 ,  B32B37/00 ,  C22C38/02 ,  C22C38/06

CPC classification number: B32B15/011 ,  B32B7/14 ,  B32B37/0084 ,  C22C38/02 ,  C22C38/06 ,  B32B2255/06 ,  B32B2255/205

Abstract: A steel welded member comprising a plurality of Zn-based plated steel materials, each having a Zn-based plating layer on a surface of a steel material, joined together through at least one spot weld, wherein the steel material contains, by mass %, C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 5.0%, the steel welded member includes, by area ratio, 20 to 80% of a Γ phase (Fe3 Zn1 0) and at least one oxide with a long axis of 0.5 μm or more in a region up to 0.5 mm from an end part of a pressure weld of the spot weld.

公开(公告)号：US20240002991A1

公开(公告)日：2024-01-04

申请号：US18041919

申请日：2021-08-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Makoto AKAHOSHI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI

IPC: C23C2/06 ,  C22C18/04 ,  C22C38/02 ,  C22C38/04 ,  C22F1/16 ,  C22F1/02 ,  C21D9/46 ,  C21D6/00 ,  C21D1/84 ,  C21D1/74 ,  B32B15/01 ,  C23C2/28

CPC classification number: C23C2/06 ,  C22C18/04 ,  C22C38/02 ,  C22C38/04 ,  C22F1/165 ,  C22F1/02 ,  C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D1/84 ,  C21D1/74 ,  B32B15/013 ,  C23C2/29

Abstract: This hot-dip Zn-based plated steel sheet includes a steel sheet and a plating layer formed on at least part of a surface of the steel sheet, in which the plating layer has a chemical composition that includes, by mass %, Al: 6.00% to 35.00%, Mg: 2.00% to 12.00%, Ca: 0.005% to 2.00%, Si: 0% to 2.00%, Fe: 0% to 2.00%, Sb: 0% to 0.50%, Sr: 0% to 0.50%, Pb: 0% to 0.50%, Sn: 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, and a remainder: Zn and impurities, the plating layer has an area ratio of a MgZn2 phase in a range of 15% to 60% in a cross section in a thickness direction, and the MgZn2 phase includes a Ca-based intermetallic compound having a circle equivalent diameter of 0.10 μm or smaller.

公开(公告)号：US20240001423A1

公开(公告)日：2024-01-04

申请号：US18252541

申请日：2022-01-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI

IPC: B21D22/02 ,  C23C2/04 ,  C22C38/00 ,  C22C38/02 ,  C22C30/06

CPC classification number: B21D22/022 ,  C23C2/04 ,  C22C38/002 ,  C22C38/02 ,  C22C30/06

Abstract: This hot stamped member includes: a steel; and a plating layer formed on the steel, in which the plating layer has a predetermined chemical composition, the plating layer contains a Zn-based oxide including one or two of a Zn oxide and a Zn—Mg oxide having a size of 1.0 μm or more and 10.0 μm or less in a thickness direction of the plating layer and 0.1 μm or more in a direction perpendicular to the thickness direction, and in a cross section of the plating layer in the thickness direction, when a length of an interface between the plating layer and the steel is indicated as Le, a sum of lengths of the Zn-based oxide projected onto the interface from an upper surface of the plating layer is indicated as ΣLi, and a sum of lengths of portions of the Zn-based oxide in contact with the plating layer projected onto the interface from the upper surface of the plating layer is indicated as ΣLai, ΣLi/Le≥0.10 and ΣLai/ΣLi≥0.50 are satisfied.

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.