公开(公告)号：US12221701B2

公开(公告)日：2025-02-11

申请号：US18622583

申请日：2024-03-29

Applicant: POSCO CO., LTD

Inventor： Ki-Cheol Kang ,  Sang-Ho Uhm ,  Chang-Woon Jee ,  Yeon-Chae Jeong ,  Kwang-Tai Min

IPC: C23C2/06 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A welded member includes: a first steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet; and a second steel sheet spot-welded on the first steel sheet and facing the zinc-based plating layer of the first steel sheet, a spot-welded zone being formed between the first steel sheet and the second steel sheet. A surface layer of the base steel sheet has a decarburization ratio of 30% or more. The decarburization ratio is represented by equation: Decarburization ratio (%) of surface layer=(1−average carbon concentration in surface layer/bulk carbon concentration)*100 where the surface layer refers to a region of the base steel sheet from the surface thereof to a depth of 35 μm. A shoulder portion of the spot-welded zone includes a B-type crack having a length of 100 μm or less, and no C-type crack.

公开(公告)号：US20250034691A1

公开(公告)日：2025-01-30

申请号：US18716260

申请日：2022-10-11

Applicant: JFE STEEL CORPORATION

Inventor： Yu ITO ,  Hideyuki TAKAHASHI ,  Kenji YAMASHIRO ,  Takumi KOYAMA ,  Yoshihiko KAKU

IPC: C23C2/20 ,  C23C2/06 ,  C23C2/40

Abstract: A gas wiping nozzle and a method for manufacturing a hot-dip metal-coated steel strip using the gas wiping nozzle. The gas wiping nozzle adjusts the coating weight of a molten metal on the surface of a steel strip pulled up from a molten metal bath. At least the surface of the gas wiping nozzle is made of a ceramic, and the arithmetic mean roughness Ra and the peak count PPI of the gas wiping nozzle satisfy Formula (1): PPI > c ⁢ 1 × Ra + c ⁢ 2 ( 1 ) PPI: peak count (the number of peaks per inch) Ra: arithmetic mean roughness [μm] c1 and c2: determined constants for each ceramic used in the surface of the gas wiping nozzle.

公开(公告)号：US20250011910A1

公开(公告)日：2025-01-09

申请号：US18710024

申请日：2022-11-10

Applicant: ThyssenKrupp Steel Europe AG

Inventor： Burak William CETINKAYA ,  Fabian JUNGE

IPC: C23C2/06 ,  B21B1/22 ,  C23C2/26 ,  C23C2/40

Abstract: This disclosure relates to a method of producing a hot-dip-coated steel sheet and to a hot-dip-coated steel sheet.

公开(公告)号：US20250010579A1

公开(公告)日：2025-01-09

申请号：US18891742

申请日：2024-09-20

Applicant: POSCO Co., Ltd.

Inventor： Seong-Woo KIM ,  Jin-Keun OH ,  A-Ra CHO ,  Hyeon-Jeong SHIN

IPC: B32B15/01 ,  B21D22/02 ,  B21D35/00 ,  B21D37/16 ,  B32B5/18 ,  B32B5/20 ,  B32B15/04 ,  B32B15/18 ,  C21D1/26 ,  C21D6/00 ,  C21D9/46 ,  C21D9/52 ,  C22C21/00 ,  C22C30/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C22F1/00 ,  C22F1/04 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C26/00 ,  C23C28/00 ,  C23C28/02 ,  C23C30/00 ,  C23F17/00

Abstract: The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is zero and wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.

公开(公告)号：US20250003029A1

公开(公告)日：2025-01-02

申请号：US18681688

申请日：2022-09-28

Applicant: POSCO CO., LTD

Inventor： Tae-Chul Kim ,  Sung-Joo Kim ,  Myung-Soo Kim ,  Bong-Hwan Yoo ,  Yong-Kyun Cho ,  Il-Ryoung Sohn

IPC: C22C18/04 ,  C23C2/06 ,  C23C2/20 ,  C23C2/26 ,  C23C2/28

Abstract: The present invention provides a plated steel sheet having excellent in corrosion resistance and surface appearance and a method for manufacturing the same. And more specifically, the present invention provides a Zn-Mg-Al-based plated steel sheet having excellent in corrosion resistance, surface appearance and image clarity after painting, and a method for manufacturing the same.

公开(公告)号：US12173407B2

公开(公告)日：2024-12-24

申请号：US18366827

申请日：2023-08-08

Applicant: Bluescope Steel Limited

Inventor： Ross McDowall Smith ,  Qiyang Liu ,  Bryan Andrew Shedden ,  Aaron Kiffer Neufeld ,  Joe Williams ,  David James Nolan ,  Wayne Renshaw

IPC: C23C2/12 ,  C23C2/06 ,  C23C2/14

Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.

公开(公告)号：US20240417860A1

公开(公告)日：2024-12-19

申请号：US18698614

申请日：2021-10-14

Applicant: POSCO CO., LTD

Inventor： Soo-Hyoun Cho ,  Won-Ho Son

IPC: C23F11/18 ,  C09D5/08 ,  C09D7/20 ,  C09D7/48 ,  C09D7/61 ,  C09D163/00 ,  C09D175/04 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

Abstract: The objective of the present invention is to provide a surface treatment composition capable of imparting excellent corrosive resistance, blackening resistance, alkali resistance, and an intrinsic surface color property on a ternary hot dip galvanized steel sheet. The present invention provides a surface treatment composition comprising, with respect to 100% by weight of the solid content of the composition: 70-90% by weight of a resin mixture including a high molecular weight polysilicon-modified polyurethane main resin, a low molecular weight polysilicon-modified polyurethane auxiliary resin, and an auxiliary epoxy resin; 0.5-10% by weight of a tarnish inhibitor; 0.5-10% by weight of an adhesion promoter; 0.5-10% by weight of an anticorrosive agent; 0.1-2% by weight of a coloring pigment; and 0.1-1% by weight of a pigment stabilizer.

公开(公告)号：US12163230B2

公开(公告)日：2024-12-10

申请号：US18341255

申请日：2023-06-26

Applicant: Fontaine Engineering und Maschinen GmbH

Inventor： Dominique Fontaine

IPC: C23C2/20 ,  C23C2/00 ,  C23C2/06 ,  C23C2/18 ,  C23C2/24

Abstract: A device for coating a metal strip with a liquid coating material comprises a coating container filled with, for example, liquid zinc. After the metal strip exits the coating container, liquid coating material adheres to the metal strip. Excess coating material is blown away from the surface of the metal strip by a blowing device. Thereafter, the metal strip runs through an electromagnetic stabilization device which is supported on the blowing device. Disturbing influences may cause the metal strip to no longer run centrally through a slot of the blowing device. A displacement or re-alignment of the blowing device is then required to guide the metal strip back to the set middle position. A first displacing device displaces the electromagnetic stabilization device relative to the blowing device in the plane transverse to the direction of transport of the metal strip to avoid an undesirable displacement of the electromagnetic stabilization device.

公开(公告)号：US20240401166A1

公开(公告)日：2024-12-05

申请号：US18799527

申请日：2024-08-09

Applicant: POSCO CO., LTD ,  POSTECH ACADEMY-INDUSTRY FOUNDATION

Inventor： Sea-Woong LEE ,  Bruno C. DE COOMAN ,  Kyoo-Young LEE ,  Eun-Jung SEO ,  Seon-Jong LEE ,  Joo-Hyun RYU ,  Won-Hwi LEE

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt %, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% or less of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.

公开(公告)号：US12157923B2

公开(公告)日：2024-12-03

申请号：US17417865

申请日：2019-08-23

Applicant: JFE Steel Corporation

Inventor： Hiroshi Hasegawa ,  Hidekazu Minami ,  Tatsuya Nakagaito

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23G1/02 ,  C21D9/00

Abstract: A high-strength hot-dip galvanized steel sheet includes a hot-dip galvanized layer on a surface of the steel sheet and has a specific component composition and a steel microstructure containing, on an area percentage basis, 90% to 100% of martensite and carbide-containing bainite in total and 0% to 10% of retained austenite, and containing prior austenite grains having an aspect ratio of 2.0 or less, in a region extending from 300 μm to 400 μm from the surface layer, in which the ratio of the average amount of C at 5 μm from the surface layer to the average amount of C at 70 μm from the surface layer is 0.2 to 0.8, and the ratio of the standard deviation of the amount of C to the average amount of C in a region extending from 300 μm to 400 μm from the surface layer is 0.40 or less.