公开(公告)号：US11578378B2

公开(公告)日：2023-02-14

申请号：US16754589

申请日：2018-10-19

Applicant: ArcelorMittal

Inventor： Anirban Chakraborty ,  Hassan Ghassemi-Armaki

IPC: C21D9/46 ,  B23K11/11 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  B23K103/20 ,  B23K103/04

Abstract: Method for the manufacture of a galvannealed steel sheet includes the following steps: A) the provision of a pre-coated steel sheet coated with a first coating comprising iron and nickel, such steel sheet having the following chemical composition in weight percent 0.10

公开(公告)号：US20230021399A1

公开(公告)日：2023-01-26

申请号：US17787019

申请日：2020-12-02

Applicant: POSCO

Inventor： Heung-Yun Kim ,  Sung-Joo Kim ,  Yong-Joo Kim ,  Dae-Young Kang

IPC: C23C2/06 ,  C23C2/28

Abstract: An exemplary embodiment in the present disclosure provides a hot-dip Zn—Al—Mg-based alloy-plated steel material having excellent corrosion resistance in a processed portion, and a method for manufacturing the same. The steel material includes: an iron substrate; and a hot-dip alloy-plated layer formed on the iron substrate, wherein the hot-dip alloy-plated layer contains, by wt %, more than 8% to 25% of Al, more than 4% to 12% of Mg, and a balance of Zn and inevitable impurities, a fraction of a MgZn2 phase in the hot-dip alloy-plated layer is 10 to 45 area %, cracks are formed inside the MgZn2 phase, and the number of cracks present per 100 μm in a direction perpendicular to a thickness direction of a steel sheet in a field of view in which the cracks are observed based on a cross section in the thickness direction of the steel sheet is 3 to 80.

公开(公告)号：US20230019786A1

公开(公告)日：2023-01-19

申请号：US17782401

申请日：2020-12-01

Applicant: POSCO

Inventor： Sung-Joo Kim ,  Heung-Yun Kim ,  Myung-Soo Kim ,  Dae-Young Kang ,  Yong-Joo Kim

IPC: C23C2/14 ,  C23C2/26 ,  C23C2/00 ,  C23C2/40 ,  C23C2/06

Abstract: A hot-dipped galvanized steel sheet having excellent bending workability and corrosion resistance and a manufacturing method therefor are provided. A hot-dipped galvanized steel sheet of the present invention comprises: a base steel sheet; a Zn—Mg—Al based plating layer provided on at least one surface of the base steel sheet and including, in wt %, with respect to components other than iron (Fe) diffused from the base steel sheet, 5.1 to 25% of Al and 4.0-10% of Mg, and the remainder of Zn and other inevitable impurities; and an interfacial alloy layer having a Fe—Al—Zn composition formed between the base steel sheet and the plating layer, wherein the interfacial alloy layer has a thickness of 0.5-2 μm and has a dendritic form, the Zn—Mg—Al based plating layer has a Zn—Al—MgZn2 ternary eutectic structure, a Zn—MgZn2 binary eutectic structure, and a structure including one or more of an Al single-phase structure having solid-solubilized Zn and a Zn single-phase structure, and agglomerated Al is included in a MgZn2 structure.

公开(公告)号：US11512380B2

公开(公告)日：2022-11-29

申请号：US16478851

申请日：2018-01-17

Applicant: NIPPON STEEL NISSHIN CO., LTD.

Inventor： Masaki Yamamoto ,  Tadashi Nakano ,  Ichiro Takahashi ,  Hiroyuki Nakamizo ,  Toshiaki Sato ,  Yoshinobu Kurisu ,  Yuuki Sakuraba ,  Yoshitaka Yukura ,  Tsutomu Ohta ,  Shinichi Kajimoto ,  Noboru Suzuki ,  Masahiko Tsuchiyama ,  Yuusuke Murai

IPC: C23C8/16 ,  C23C30/00 ,  C23C2/06 ,  C22C21/10 ,  C23C2/26 ,  C22C23/04 ,  C22C18/04

Abstract: The present invention provides a method for manufacturing more beautiful black coated steel sheets by uniformly blackening the coating layer. Specifically, the present invention provides a method for manufacturing black coated steel sheets, which brings Zn—Al—Mg alloy coated steel sheets (1) into contact with steam in a closed container (10), wherein said closed container (10) can maintain a predefined internal pressure through variable control of the amount of steam flowing into said closed container (10) and/or the amount of steam flowing out of said closed container (10), and in said closed container (10) that can maintain said predefined pressure, said Zn—Al—Mg alloy coated steel sheets (1) have contact with the steam introduced into said closed container (10).

公开(公告)号：US11512362B2

公开(公告)日：2022-11-29

申请号：US17087019

申请日：2020-11-02

Applicant: ArcelorMittal

Inventor： Olga A. Girina ,  Damon Panahi

IPC: C21D9/46 ,  C21D1/22 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/00 ,  C23C2/02 ,  B32B15/04 ,  C22C38/44 ,  C23C2/26 ,  C23C30/00 ,  C22C38/18 ,  B32B15/01 ,  C22C38/12 ,  C23C2/34 ,  B32B15/18 ,  C22C38/22 ,  C22C38/34 ,  C22C38/38

Abstract: A method for producing a coated steel sheet having a tensile strength TS of at least 1450 MPa and a total elongation TE of at least 17% includes the successive steps of providing a cold rolled steel sheet made of a steel having a chemical composition comprising, in weight %: 0.34%≤C≤0.45%, 1.50%≤Mn≤2.30%, 1.50≤Si≤2.40%, 0%

公开(公告)号：US20220371302A1

公开(公告)日：2022-11-24

申请号：US17771012

申请日：2020-10-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Mamoru SAITO ,  Yasuto GOTO ,  Kiyokazu ISHIZUKA

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

Abstract: A coated steel material including: a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel, wherein the coating layer has a predetermined chemical composition, and, in a backscattered electron image of the Zn—Al—Mg alloy layer that is obtained at a time of observing the surface of the Zn—Al—Mg alloy layer after polishing to ½ of the layer thickness, under a scanning electron microscope at a magnification of 100×, Al crystals are present, and the average value of the cumulative circumferential length of the Al crystals is 88 to 195 mm/mm2.

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：US11492676B2

公开(公告)日：2022-11-08

申请号：US16931001

申请日：2020-07-16

Applicant: ARCELORMITTAL

Inventor： Rashmi Ranjan Mohanty ,  Hyun Jo Jun ,  Dongwei Fan

IPC: C21D9/46 ,  B32B15/01 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21D8/02 ,  C21D1/18 ,  C22C38/02 ,  C22C38/38 ,  C22C38/34 ,  C22C38/06 ,  C22C38/58

Abstract: A method is for producing a high strength coated steel sheet having a yield stress YS>800 MPa, a tensile strength TS>1180 MPa, and improved formability and ductility. The steel contains: 15%≤C≤0.25%, 1.2%≤Si≤1.8%, 2%≤Mn≤2.4%, 0.1%≤Cr≤0.25%, Al≤0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature higher than Ac3 and lower than 1000° C. for a time of more than 30 s, then quenched by cooling it to a quenching temperature QT between 250° C. and 350° C., to obtain a structure consisting of at least 60% of martensite and a sufficient austenite content such that the final structure contains 3% to 15% of residual austenite and 85% to 97% of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 430° C. and 480° C. and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated and cooled to the room temperature.

公开(公告)号：US11479936B1

公开(公告)日：2022-10-25

申请号：US16948727

申请日：2020-09-30

Applicant: USA Intellectual Property Holding, Inc.

Inventor： James Earl Goff ,  Luke John Drazek ,  John Curtis Thompson, Jr. ,  Anthony Lane Eldridge

IPC: C23C2/00 ,  E02D5/80 ,  C23C2/02 ,  C23C28/00 ,  C23C2/38 ,  B24C1/08 ,  E04H12/20 ,  C23C2/26 ,  C23C2/06

Abstract: A process for manufacturing corrosion resistant metal components is disclosed. The process comprises abrasive blasting of a silicon-containing steel substrate followed by hot dip galvanizing, a second abrasive blasting process, treating with a mineral acid, and coating with a polymeric coating. The resulting corrosion resistance is enhanced.

公开(公告)号：US11479840B2

公开(公告)日：2022-10-25

申请号：US17044731

申请日：2019-04-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Tooru Oohashi

IPC: C23C2/00 ,  C23C2/06 ,  C23C2/40 ,  F16C13/00

Abstract: A pass roll for a hot-dip galvanized steel sheet manufacturing facility, the pass roll includes: a roll body; and a heat-resistant felt layer covering the roll body, wherein the heat-resistant felt layer has a thermal decomposition temperature of 420° C. or higher and has a surface hardness evaluation index at 400° C. of more than 0.11 μm/N.