公开(公告)号：US12173391B2

公开(公告)日：2024-12-24

申请号：US18271138

申请日：2022-03-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Keitaro Matsuda ,  Takuya Mitsunobu ,  Masaaki Uranaka ,  Jun Maki ,  Hiroshi Takebayashi

IPC: C22C38/38 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C23C2/06 ,  C23C2/40

Abstract: High strength steel sheet and plated steel sheet having high plateability, LME resistance, and hydrogen embrittlement resistance, that is, steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50%, having an internal oxidation layer including fine granular oxides, coarse granular oxides, and grain boundary oxides in a surface layer of the steel sheet, a number density of fine granular oxides in the internal oxidation layer being 4.0/μm2 or more, a number density of coarse granular oxides in the internal oxidation layer being 4.0/25 μm2 or more, having a Ratio A of the length of the grain boundary oxides projected on the surface of the steel sheet to the length of the surface of the steel sheet when examining a cross-section of the surface layer of the steel sheet being 50% or more and 100% or less, and including a surface depleted layer with a steel composition not including oxides which satisfies, by mass %, Si≤0.6% and Al≥0.05% at a depth of ½ of the average depth of the internal oxidation layer calculated from the cross-sectional SEM image of the steel sheet, and a plated steel sheet using the same.

公开(公告)号：US11807924B2

公开(公告)日：2023-11-07

申请号：US16753961

申请日：2017-11-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Jun Maki ,  Soshi Fujita ,  Toyomitsu Nakamura

IPC: C22C38/54 ,  B23K11/00 ,  B23K35/02 ,  B23K35/30 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C25D3/44 ,  C25D7/04 ,  B23K103/04 ,  B23K101/06

CPC classification number: C22C38/54 ,  B23K11/002 ,  B23K35/0261 ,  B23K35/3053 ,  C21D9/08 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C25D3/44 ,  C25D7/04 ,  B23K2101/06 ,  B23K2103/04

Abstract: An Al plated electric resistance welded steel pipe for hardening use suppressing the formation of scale to the inside of the plating layer while performing hot forming and an Al plated hollow member using that Al plated electric resistance welded steel pipe, wherein the Al plated electric resistance welded steel pipe for hardening use is comprised of a base material made of a tubular steel plate and having a predetermined chemical composition and an electric resistance welded zone provided at a seam portion of the steel plate and extending in a longitudinal direction of the steel plate, the base material is further provided with an intermetallic compound layer positioned on the surface of the steel plate and including an Al—Fe—Si-based intermetallic compound and an Al plating layer positioned on the surface of the intermetallic compound layer and containing Al and Si, and 70×X/D≤Y/t≤30 is satisfied, wherein X (μm) is a thickness of the intermetallic compound layer, Y (μm) is a thickness of the Al plating layer, t (mm) is a pipe thickness of the steel pipe, and D (mm) is an outside diameter of the steel pipe.

公开(公告)号：US10982303B2

公开(公告)日：2021-04-20

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：US11992867B2

公开(公告)日：2024-05-28

申请号：US17802584

申请日：2020-02-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Takehiro Takahashi ,  Jun Maki

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

CPC classification number: B21D22/022 ,  B32B15/013 ,  C22C18/04 ,  C23C2/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  Y10T428/12757

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 90.0% of an Mg—Zn containing phase, 5.0 to less than 30.0% of an Fe—Al containing phase, and 2.0 to 25.0% of an Al—Si containing oxide phase, the Mg—Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and the Fe—Al containing phase comprises at least one of an FeAl phase and Fe—Al—Zn phase.

公开(公告)号：US11725259B2

公开(公告)日：2023-08-15

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

CPC classification number: C22C18/04 ,  B32B15/012 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D9/46 ,  C22C18/00 ,  C22C21/00 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/285 ,  C23C2/40 ,  C23C28/02 ,  C23C28/023 ,  C23C28/025 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  C22C38/00 ,  C22C38/06 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12972

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：US12281375B2

公开(公告)日：2025-04-22

申请号：US18463110

申请日：2023-09-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Jun Maki ,  Soshi Fujita ,  Toyomitsu Nakamura

IPC: C22C38/54 ,  B23K11/00 ,  B23K35/02 ,  B23K35/30 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23C2/26 ,  C23C2/28 ,  C25D3/44 ,  C25D7/04 ,  B23K101/06 ,  B23K103/04

Abstract: An Al plated electric resistance welded steel pipe for hardening use suppressing the formation of scale to the inside of the plating layer while performing hot forming and an Al plated hollow member using that Al plated electric resistance welded steel pipe, wherein the Al plated electric resistance welded steel pipe for hardening use is comprised of a base material made of a tubular steel plate and having a predetermined chemical composition and an electric resistance welded zone provided at a seam portion of the steel plate and extending in a longitudinal direction of the steel plate, the base material is further provided with an intermetallic compound layer positioned on the surface of the steel plate and including an Al—Fe—Si-based intermetallic compound and an Al plating layer positioned on the surface of the intermetallic compound layer and containing Al and Si, and 70×X/D≤Y/t≤30 is satisfied, wherein X (μm) is a thickness of the intermetallic compound layer, Y (μm) is a thickness of the Al plating layer, t (mm) is a pipe thickness of the steel pipe, and D (mm) is an outside diameter of the steel pipe.

公开(公告)号：US12215399B2

公开(公告)日：2025-02-04

申请号：US17440646

申请日：2020-04-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu Fujii ,  Jun Maki ,  Kazutoshi Takeda ,  Hiroyuki Mimura ,  Yusuke Kanto ,  Shuichi Yamazaki

IPC: C21D8/12 ,  H01F1/18

Abstract: A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”.

公开(公告)号：US11697266B2

公开(公告)日：2023-07-11

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 ,  C22C18/04 ,  C23C2/02 ,  C23C28/02 ,  C23C2/26 ,  C23C30/00 ,  C23C2/12 ,  B32B15/04 ,  B32B15/18 ,  C23C2/04 ,  C22C38/00

CPC classification number: B32B15/013 ,  B32B15/012 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C22C18/00 ,  C22C18/04 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/20 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  C23C28/023 ,  C23C28/025 ,  C23C30/00 ,  C23C30/005 ,  C22C38/00 ,  Y10T428/12757 ,  Y10T428/12792 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979

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：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：US11948710B2

公开(公告)日：2024-04-02

申请号：US18271622

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu Fujii ,  Jun Maki ,  Kazutoshi Takeda ,  Akira Akagi ,  Yuya Fujii

IPC: H01F1/147 ,  B32B15/04 ,  B32B15/18 ,  C23C22/03 ,  C23C22/82

CPC classification number: H01F1/147 ,  B32B15/043 ,  B32B15/18 ,  C23C22/03 ,  C23C22/82 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2307/206 ,  B32B2307/704 ,  B32B2307/714 ,  B32B2307/748

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention is a non-oriented electrical steel sheet including a base metal steel sheet and a composite coating film that is formed on surfaces of the base metal steel sheet and includes Zn-containing phosphate and an organic resin, wherein the non-oriented electrical steel sheet contains crystalline aluminum phosphate showing diffraction lines belonging to ICDD No. 01-074-3256 when the composite coating film is measured by a wide-angle X-ray diffraction method.