公开(公告)号：US20240043954A1

公开(公告)日：2024-02-08

申请号：US18267381

申请日：2021-12-09

Applicant: POSCO Co., Ltd.

Inventor： Young-Ha Kim ,  Suk-Kyu Lee ,  Tae-Kyo Han ,  Dae-Young Kang

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C21D6/00 ,  B32B15/01 ,  C23C2/28 ,  C23C2/06

CPC classification number: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/0263 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D6/005 ,  C21D6/008 ,  B32B15/013 ,  C23C2/28 ,  C23C2/06

Abstract: One embodiment of the present invention provides a high-strength hot-dip galvanized steel sheet having excellent coatability and a manufacturing method therefor, the hot-dip galvanized steel sheet having a base steel sheet and a hot-dip galvanized layer formed on one or both surfaces of the base steel sheet, wherein the base steel sheet comprises an internal oxide layer comprising, by weight %, carbon (C): 0.1% to 0.3%, silicon (Si): 0.1% to 2.0%, aluminum (Al): 0.1% to 1.5%, manganese (Mn): 1.5% to 3.0%, and the balance being Fe and unavoidable impurities, wherein the sum of Si and Al satisfies 1.2% to 3.5%, the ratio of Al and Si (Al/Si) satisfies 0.5 to 2.0, the surface roughness (Ra) of the base steel sheet is 0.5 or more, and the thickness directly under the surface of the base steel sheet is less than 4 μm.

公开(公告)号：US20240043701A1

公开(公告)日：2024-02-08

申请号：US18267319

申请日：2021-12-10

Applicant: POSCO Co., Ltd

Inventor： Il-Ryoung Sohn

IPC: C09D5/08 ,  C22C18/04 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26 ,  C23C2/40 ,  C09D167/00 ,  C08L67/00

CPC classification number: C09D5/08 ,  C22C18/04 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C23C2/06 ,  C23C2/12 ,  C23C2/265 ,  C23C2/40 ,  C09D167/00 ,  C08L67/00

Abstract: The objective of the present invention is to provide a composite plated steel sheet, which has excellent post-formation corrosion resistance by preventing the spread of cracks in a resin layer even if cracks occur in the plating layer of the composite plated steel sheet.

公开(公告)号：US20240035105A1

公开(公告)日：2024-02-01

申请号：US18257178

申请日：2021-12-15

Applicant: JFE STEEL CORPORATION

Inventor： Takuya HIRASHIMA ,  Tatsuya NAKAGAITO ,  Masaki KOBA ,  Yoichi MAKIMIZU ,  Katsuya HATA ,  Shotaro TERASHIMA

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/38 ,  C22C38/06 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/02 ,  C22C38/38 ,  C22C38/06 ,  C22C38/002 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/008

Abstract: Provided is a hot-dip galvanized steel sheet having both high strength and good workability, as well as excellent coating quality. The chemical composition of the base steel sheet is set within a specified range, the steel microstructure of the base steel sheet is a complex structure of ferrite, martensite and bainite, oxygen is present as oxides in the surface layer of the base steel sheet in an amount of 0.05 g/m2 or more and 0.50 g/m2 or less per surface, and the hot-dip galvanized layer contains Fe in an amount of 0.40 mass % or more.

公开(公告)号：US11884998B2

公开(公告)日：2024-01-30

申请号：US16499830

申请日：2017-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Akihiro Sengoku ,  Hiroshi Takebayashi

IPC: C22C38/04 ,  B21D22/00 ,  C22C38/02 ,  C23C2/06 ,  C23C2/12 ,  C23C4/08

CPC classification number: C22C38/04 ,  B21D22/00 ,  C22C38/02 ,  C23C2/06 ,  C23C2/12 ,  C23C4/08

Abstract: Provided is a surface treated steel sheet which includes a base metal, and a plated layer formed on a surface of the base metal, wherein an average composition of the plated layer contains, in mass %, Mg: 0.5 to 2.0%, and [60.0≤Zn+Al≤98.0], [0.4≤Zn/Al≤1.5], and [Zn/Al×Mg≤1.6] are satisfied.

公开(公告)号：US11884987B2

公开(公告)日：2024-01-30

申请号：US16760399

申请日：2018-10-19

Applicant: ARCELORMITTAL

Inventor： David Zapico Alvarez ,  Florence Bertrand ,  Joris Giroux

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/26 ,  C21D1/76 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21D9/56 ,  C21D9/573 ,  C22C18/04 ,  C22C38/38 ,  C23C2/04 ,  C23C2/28 ,  C22C38/14 ,  C21D9/00 ,  C21D1/74 ,  C23C28/00

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/26 ,  C21D1/76 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/0062 ,  C21D9/561 ,  C21D9/573 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/04 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D1/74 ,  C21D2201/02 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C23C28/321 ,  C23C28/345

Abstract: A method for the manufacture of a galvannealed steel sheet including the provision of a specific steel sheet, a recrystallization annealing with specific heating, soaking and cooling sub-steps using an inert gas, a hot-dip galvanizing and an alloying treatment; the galvannealed steel sheet and the use of the galvannealed steel sheet.

公开(公告)号：US20240026491A1

公开(公告)日：2024-01-25

申请号：US18110036

申请日：2023-02-15

Applicant: ArcelorMittal

Inventor： Frédéric BONNET ,  Yannick DOH

IPC: C21D11/00 ,  B32B15/01 ,  C21D1/667 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C23C2/06 ,  C23C2/28

CPC classification number: C21D11/005 ,  B32B15/012 ,  B32B15/013 ,  C21D1/667 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D9/46 ,  C23C2/06 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A method for manufacturing a thermally treated steel sheet is described. The method includes:



A. preparation step containing:

1) a selection substep, wherein:

a. mtarget and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure mstandard closest to mtarget and TPstandard is selected, including at least a heating, a soaking and a cooling steps, to obtain mstandard,
b. a heating path, a soaking path including a soaking temperature Tsoaking, a power cooling of the cooling system and a cooling temperature Tcooling are selected based on TPstandard and


2) a calculation substep, wherein through variation of the cooling power, new cooling paths CPx are calculated based on the product selected in step A.1)a and TPstandard, the initial microstructure mi of the steel sheet to reach mtarget, the heating path, the soaking path comprising Tsoaking and Tcooling, the cooling step of TPstandard is recalculated using said CPx in order to obtain new thermal paths TPx, each TPx corresponding to a microstructure mx,
3) a selection substep wherein one TPtarget to reach mtarget is selected, TPtarget being chosen among the calculated thermal paths TPx and being selected such that mx is the closest to mtarget, and


B. a thermal treatment step wherein TPtarget is performed on the steel sheet.

公开(公告)号：US20240011114A1

公开(公告)日：2024-01-11

申请号：US18035066

申请日：2021-12-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Eriko TSUKAMOTO ,  Kengo TAKEDA

IPC: C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/009 ,  C21D2211/001 ,  C21D2211/008

Abstract: This steel sheet has a predetermined chemical composition, and includes, as a metallographic structure, ferrite, bainite, and pearlite in a total volume percentage of 0% or more and 50% or less, residual austenite in a volume percentage of 3% or more and 20% or less, and a remainder of fresh martensite and tempered martensite, in which residual austenite having an aspect ratio of 3.0 or more occupies 80% or more of a total residual austenite by area ratio, the steel sheet includes an internal oxide layer having a thickness of 4.0 μm or more from a surface of the steel sheet and a decarburized layer having a thickness of 10 μm or more and 100 μm or less from the surface of the steel sheet, and an amount of diffusible hydrogen included in the steel sheet is 1.00 ppm or less on a mass basis.

公开(公告)号：US20240002992A1

公开(公告)日：2024-01-04

申请号：US18468268

申请日：2023-09-15

Applicant: POSCO CO., LTD

Inventor： Il-Ryoung SOHN ,  Hyeon-Seok HWANG ,  Jong-Sang KIM

IPC: C23C2/06 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  B21D37/16 ,  B21D22/02 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C23C2/26 ,  C23C2/28

CPC classification number: C23C2/06 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  B21D37/16 ,  B21D22/02 ,  C21D8/0247 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/00 ,  C21D8/0278 ,  C21D8/0236 ,  C23C2/022 ,  C23C2/261 ,  C23C2/29 ,  B21D22/022

Abstract: Provided is a hot press formed product, which is prepared by means of hot press forming of a Zn—Al—Mg-based plated steel material comprising base iron and a Zn—Al—Mg-based plated layer, and a method for preparing the same, the hot press formed product comprising an oxide layer formed on the surface thereof, wherein the content ratio of Al to Mg (Al/Mg) in the oxide layer is 0.8 or more.

公开(公告)号：US11859259B2

公开(公告)日：2024-01-02

申请号：US17047663

申请日：2019-04-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Takafumi Yokoyama ,  Kunio Hayashi ,  Masahiro Nakata ,  Yuji Yamaguchi ,  Satoshi Uchida

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/26 ,  C21D6/00 ,  C22C3/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C23C2/28 ,  C22C38/00

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/26 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

Abstract: A zinc-plated steel sheet includes a steel sheet having a predetermined chemical composition and a zinc-plated layer. In the steel sheet, steel microstructures in a range of ⅛ thickness to ⅜ thickness, having the center at ¼ thickness from a steel sheet surface, include, by vol %, ferrite: 0% to 10%, bainite: 0% to 30%, tempered martensite: 50% or more, fresh martensite: 0% to 10%, retained austenite: more than 10% and 30% or less, and pearlite: 0% to 5%. In the zinc-plated steel sheet, the amount of hydrogen emitted when the steel sheet is heated to 200° C. from room temperature after removal of the zinc-plated layer is 0.40 ppm or less per mass of the steel sheet, the tensile strength is 1470 MPa or more, and no cracking occurs in a U-shape bending test where a stress equivalent to 1000 MPa is applied for 24 hours.

公开(公告)号：US11859091B2

公开(公告)日：2024-01-02

申请号：US16870744

申请日：2020-05-08

Applicant: Zirconia Inc.

Inventor： Balamuralee Venkatesalu Balaguru ,  Benjamin Theodore Cook

IPC: C09D1/00 ,  C09D7/40 ,  B05D7/14 ,  B05D7/24 ,  C23C2/26 ,  C09D5/03 ,  C09D5/08 ,  C23C2/06

CPC classification number: C09D1/00 ,  B05D7/14 ,  B05D7/24 ,  C09D5/031 ,  C09D5/033 ,  C09D5/08 ,  C09D7/67 ,  C09D7/70 ,  C23C2/06 ,  C23C2/26 ,  B05D2202/10 ,  B05D2401/20 ,  B05D2401/32

Abstract: Inorganic coatings that may be used to coat and protect steel are disclosed. The protective inorganic coatings include a liquid composition portion comprising water, alkali metal oxide components and a silicate-containing component. The coatings also include a powder composition portion comprising microspheres, metal oxide powder and optional microfibers. When applied to steel substrates, the coatings provide chemical and physical protection.