公开(公告)号：US11807940B2

公开(公告)日：2023-11-07

申请号：US17789753

申请日：2020-02-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Takehiro Takahashi ,  Jun Maki

IPC: C23C2/06 ,  C23C2/28 ,  C23C2/12 ,  C23C30/00 ,  C22C18/04 ,  C22C21/08 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C22C18/00 ,  C22C21/00 ,  C22C21/10 ,  C22C30/00 ,  C22C30/06 ,  C23C2/40 ,  C23C2/02 ,  C23C2/26 ,  B21D22/20 ,  C22C38/58 ,  C22C38/00 ,  C22C38/06 ,  C21D1/18 ,  C21D9/00

CPC classification number: C23C2/06 ,  B21D22/20 ,  B32B15/01 ,  B32B15/012 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C22C18/00 ,  C22C18/04 ,  C22C21/00 ,  C22C21/08 ,  C22C21/10 ,  C22C30/00 ,  C22C30/06 ,  C23C2/02 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C23C30/00 ,  C23C30/005 ,  C21D1/18 ,  C21D9/00 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/26

Abstract: A plated steel material comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, and in a surface structure of the plating layer, there is, by area ratio, 2.0% or more of an acicular Al—Zn—Si—Ca phase.

公开(公告)号：US11584981B2

公开(公告)日：2023-02-21

申请号：US17421954

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Jun Maki ,  Hiroshi Takebayashi ,  Takehiro Takahashi ,  Kohei Tokuda

IPC: C22C18/04 ,  C23C2/06 ,  C22C21/00 ,  C23C2/28 ,  C23C2/40

Abstract: A plated steel sheet having excellent post-coating corrosion resistance 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% to 2.00%, and a remainder consisting of Zn and impurities, and in a cross section of the plating layer, the area fraction of a Fe2Al5 phase is 5.0% to 60.0%, the area fraction of an eutectic structure of Zn and MgZn2 is 10.0% to 80.0%, the area fraction of a massive MgZn2 phase is 5.0% to 40.0%, and the area fraction of a remainder is 10.0% or less.

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：US11692249B2

公开(公告)日：2023-07-04

申请号：US17802583

申请日：2020-02-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Takehiro Takahashi ,  Jun Maki

IPC: C22C30/06 ,  B32B15/01 ,  C23C2/06

CPC classification number: C22C30/06 ,  B32B15/013 ,  C23C2/06

Abstract: A hot stamped body comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 85.0% of an Mg—Zn containing phase and 15.0 to 90.0% of an Fe—Al containing phase, the Mg—Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2 Zn3 phase, and MgZn2 phase, and the Fe—Al containing phase comprises at least one of an FeAl phase and Fe—Al—Zn phase and an area ratio of the Fe—Al—Zn phase in the main layer is 10.0% or less.

公开(公告)号：US11634791B2

公开(公告)日：2023-04-25

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: B32B15/01 ,  C22C18/04 ,  C23C2/06 ,  C23C2/40 ,  C22C38/00 ,  C23C2/26 ,  C23C2/28 ,  C22C30/06 ,  C22C18/00 ,  C23C30/00 ,  B32B15/04 ,  B32B15/18 ,  C23C28/02 ,  C23C2/02

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：US11634790B2

公开(公告)日：2023-04-25

申请号：US17434988

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Jun Maki ,  Hiroshi Takebayashi ,  Takehiro Takahashi ,  Kohei Tokuda

IPC: C22C18/04 ,  C23C2/06 ,  C23C2/02 ,  B32B15/01 ,  C23C2/40 ,  C23C28/02 ,  C22C18/00 ,  C23C28/00 ,  C23C2/28 ,  C23C2/26 ,  C23C30/00 ,  B32B15/04 ,  B32B15/18 ,  C22C21/00 ,  C23C2/12 ,  C22C38/06 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00

Abstract: A plated steel sheet includes: a steel sheet; and a plating layer that is formed on at least a part of a surface of the steel sheet, in which a chemical composition of the plating layer includes, by mass %, Al: more than 5.00% and 35.00% or less, Mg: 3.00% to 15.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder of Zn and impurities, in which in a cross section of the plating layer in a thickness direction, the area ratio of a lamellar structure in which an (Al—Zn) phase and a MgZn2 phase are arranged in layers is 10% to 90%, a lamellar spacing of the lamellar structure is 2.5 μm or less, and the area ratio of an (Al—Zn) dendrite is 35% or less.

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.