公开(公告)号：US12209316B2

公开(公告)日：2025-01-28

申请号：US18028783

申请日：2021-04-08

Applicant: BORCELIK CELIK SAN. TIC. A. S.

Inventor： Derya Tabak ,  Oguz Yildirim ,  Aydin Ersoy ,  Sertac Ozer

IPC: C23C2/24 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C22/10 ,  C23C22/76 ,  C23C28/00

Abstract: Disclosed are processes of applying a coating material to galvanized surfaces or materials, which provides significant increases in corrosion resistance. The coating material mentioned herein is applied to the material or surfaces in such a way that the coating can provide the best performance. The obtained coating material is applied to galvanized material or surfaces by making appropriate improvements to the coating material without requiring additional equipment and processes.

公开(公告)号：US12195819B2

公开(公告)日：2025-01-14

申请号：US17632566

申请日：2020-07-16

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Takeshi Yokota

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28 ,  C23G1/08

Abstract: The high-strength thin steel sheet has a chemical composition containing C, Si, Mn, P, S, Al, and N, with the balance being Fe and inevitable impurities, and a complex structure containing ferrite, tempered martensite, and bainite, where a volume fraction of a total of tempered martensite and bainite containing five or more carbides with a particle size of 0.1 μm or more and 1.0 μm or less in a grain with respect to a total of the tempered martensite and the bainite is 85% or more, and C mass % and Mn mass % in a region of 20 μm or less in a thickness direction from a surface of the steel sheet are each 20% or less with respect to C mass % and Mn mass % in a region of 100 μm or more and 200 μm or less from the surface of the steel sheet.

公开(公告)号：US12180559B2

公开(公告)日：2024-12-31

申请号：US18035925

申请日：2021-11-03

Applicant: POSCO CO., LTD

Inventor： Sang-Hyun Kim ,  Seong-Ho Han ,  Chung-Won Kim ,  Yu-Mi Ha

IPC: B32B15/01 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/32 ,  C23C2/02 ,  C23C2/26

Abstract: Provided are a bake-hardened hot-dip galvanized steel sheet with excellent powdering resistance, and a manufacturing method therefor. The bake-hardened hot-dip galvanized steel sheet comprises, by wt %, 0.0001-0.005% of carbon (C), 0.1-1.2% of manganese (Mn), 0.02% or less of silicon (Si) (excluding 0%), 0.01-0.04% of phosphorus (P), 0.01% or less of sulfur (S) (excluding 0%), 0.01% or less of nitrogen (N) (excluding 0%), 0.01-0.06% of aluminum (sol.Al), 0.003-0.015% of niobium (Nb), 0.0005-0.0035% of boron (B), 0.01-0.1% of chromium (Cr), 0.005-0.05% of molybdenum (Mo), 0.003% or less of titanium (Ti) (excluding 0%), and the balance of Fe and inevitable impurities, and satisfies relationships 1 and 2, wherein the microstructure thereof is ferrite single phase and satisfies relationship 3.

公开(公告)号：US20240417820A1

公开(公告)日：2024-12-19

申请号：US18273950

申请日：2022-03-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya NISHIO ,  Ryosuke NAKAMURA ,  Masafumi AZUMA

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: This cold-rolled steel sheet has a predetermined chemical composition, in which a metallographic structure of a t/4 portion, which is at a ¼ position of a sheet thickness t from a surface of the cold-rolled steel sheet in a sheet thickness direction, includes, by volume percentage, retained austenite: 2.5% or more and 10.0% or less, tempered martensite: 80.0% or more and 97.5% or less, ferrite and bainite: 0.0% or more and 15.0% or less in total, and martensite: 0.0% or more and 3.0% or less, and in a surface layer area at a position 25 μm away from the surface in the sheet thickness direction, an amount of solute Si is 0.30% or more and 1.50% or less by mass %, a volume percentage of ferrite in the metallographic structure is 0.0% or more and 20.0% or less, and a density of ferrite grains having a grain size of 15 μm or more is 0 grains/mm2 or more and 3,000 grains/mm2 or less.

公开(公告)号：US20240410028A1

公开(公告)日：2024-12-12

申请号：US18794600

申请日：2024-08-05

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Sang-Heon Kim ,  Hyo-Sik Chun

IPC: C21D8/02 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/12 ,  C23C2/40

Abstract: Provided are plated steel sheets for hot press forming, hot press formed parts, and manufacturing methods thereof, the plated steel sheets comprising: a base steel sheet comprising, in weight %, C: 0.07 to 0.5%, Si: 0.05 to 1%, Mn: 0.5 to 5%, P: 0.001 to 0.015%, S: 0.0001 to 0.02%, Al: 0.01 to 0.18, Cr: 0.01 to 1%, N: 0.001 to 0.02%, Ti: 0.1% or less, B: 0.01% or less, Sn: 0.01 to 0.1%, and a balance of Fe and inevitable impurities; an aluminum or aluminum alloy plating layer disposed on at least one surface of the base steel sheet; and an Sn-enriched layer provided between the base steel sheet and the plating layer, wherein the Sn-enriched layer satisfies a specific relationship.

公开(公告)号：US12139782B2

公开(公告)日：2024-11-12

申请号：US18091794

申请日：2022-12-30

Applicant: ArcelorMittal

Inventor： Anirban Chakraborty ,  Hassan Ghassemi-Armaki ,  Pascal Bertho ,  Christian Allely

IPC: C22C38/58 ,  C21D1/76 ,  C21D9/46 ,  C21D9/56 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  B23K11/11 ,  B23K35/02 ,  B23K35/28 ,  B23K35/30 ,  B23K103/04

Abstract: The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10

公开(公告)号：US12139771B2

公开(公告)日：2024-11-12

申请号：US17425453

申请日：2019-10-18

Applicant: JFE Steel Corporation

Inventor： Lingling Yang ,  Tatsuya Nakagaito ,  Yuki Takeda

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A high-strength steel sheet that has a predetermined component composition, that has a steel microstructure in which an area percentage of ferrite ranges from 5% to 50% in a thickness cross-section in a rolling direction, a total area percentage of fresh martensite and retained γ ranges from 2% to 30%, each of the fresh martensite and the retained γ has an average grain size of 5 μm or less, and a ratio of the fresh martensite and the retained γ adjacent only to ferrite with respect to the fresh martensite and the retained γ from a surface to 200 μm in the thickness direction is 30% or less in total area percentage, and that has a yield strength of 550 MPa or more.

公开(公告)号：US12134245B2

公开(公告)日：2024-11-05

申请号：US18131622

申请日：2023-04-06

Applicant: ArcelorMittal

Inventor： Christian Allely ,  Pascal Bertho ,  Anirban Chakraborty ,  Hassan Ghassemi-Armaki

IPC: B32B15/01 ,  B23K11/11 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28 ,  C23C10/28 ,  C25D3/12 ,  C25D3/22 ,  C25D5/12 ,  C25D5/50

Abstract: The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10

公开(公告)号：US20240326399A1

公开(公告)日：2024-10-03

申请号：US18353843

申请日：2023-07-17

Applicant: POSCO CO., LTD

Inventor： Tae-Jin SONG ,  Min-Seo KOO

IPC: B32B38/00 ,  B23K20/04 ,  B23K20/227 ,  B23K20/24 ,  B23K31/02 ,  B23K101/16 ,  B23K101/18 ,  B23K103/04 ,  B23K103/18 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D1/18 ,  C21D1/25 ,  C21D8/02 ,  C21D8/04 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/18 ,  C23C2/34 ,  C23C2/40 ,  C23C30/00

CPC classification number: B32B38/004 ,  B23K20/04 ,  B23K20/227 ,  B23K20/24 ,  B23K31/02 ,  B32B15/01 ,  B32B15/011 ,  B32B15/015 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D1/18 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/041 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/48 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/022 ,  C23C2/024 ,  C23C2/026 ,  C23C2/06 ,  C23C2/12 ,  C23C2/18 ,  C23C2/34 ,  C23C2/40 ,  C23C30/00 ,  C23C30/005 ,  B23K2101/16 ,  B23K2101/18 ,  B23K2103/04 ,  B23K2103/18 ,  B32B15/012 ,  B32B15/013 ,  B32B2038/0048 ,  B32B2250/03 ,  B32B2250/40 ,  B32B2307/536 ,  B32B2307/552 ,  B32B2307/72 ,  C21D1/25 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2251/02 ,  C22C38/04 ,  Y10T428/12451 ,  Y10T428/12493 ,  Y10T428/12729 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/12993 ,  Y10T428/2495 ,  Y10T428/24959 ,  Y10T428/24967 ,  Y10T428/24992 ,  Y10T428/26 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

Abstract: A method of manufacturing a low-density clad steel sheet, including: preparing a base material, a lightweight steel sheet including C: 0.3 to 1.0%, Mn: 4.0 to 16.0%, Al: 4.5 to 9.0%, and Fe; preparing cladding materials, each being martensitic carbon steel including C: 0.1 to 0.45%, Mn: 0.1 to 3.0%, and Fe; disposing the base material between the cladding materials to obtain a laminate; welding an edge of the laminate, and heating the welded laminate to 1050 to 1350° C.; finish-rolling the heated laminate to 750 to 1050° C. with a rolling reduction ratio of 30% or more in a first pass, to obtain a hot-rolled steel sheet; coiling the hot-rolled steel sheet at 400 to 700° C.; applying a cold-reduction ratio of 35 to 90% to obtain a cold-rolled steel sheet; and annealing the cold-rolled steel sheet at 550° C. or higher and A3+200° C. or lower of the cladding materials.

公开(公告)号：US20240295003A1

公开(公告)日：2024-09-05

申请号：US18643362

申请日：2024-04-23

Applicant: POSCO CO., LTD

Inventor： Seong-Woo Kim ,  Jin-Keun Oh ,  Sang-Heon Kim ,  Sang-Bin Han

IPC: C21D9/48 ,  B32B15/01 ,  C21D6/00 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/48 ,  B32B15/012 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0405 ,  C21D8/0421 ,  C21D8/0447 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40

Abstract: The present invention pertains to a hot press forming member having excellent resistance to hydrogen embrittlement, and a method for manufacturing same. An aspect of the present invention provides a hot press forming member having excellent resistance to hydrogen embrittlement, the hot press forming member comprising a base steel plate and an alloy-plated layer formed on the surface of the base steel plate, wherein the alloy-plated layer contains pores such that pores having a size of 5 μm or less constitute 3-30% of the surface area of the alloy-plated layer as viewed in a cross-section taken in the thickness direction of the member.