公开(公告)号：US11897229B2

公开(公告)日：2024-02-13

申请号：US17784729

申请日：2020-12-18

Applicant: POSCO

Inventor： Suk-Kyu Lee ,  Hyeon-Seok Hwang ,  Myung-Soo Kim

IPC: B32B15/01 ,  C23C2/28 ,  C22C21/02 ,  C22C21/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C2/12 ,  C23C2/40 ,  C23C2/26

CPC classification number: B32B15/012 ,  C22C21/02 ,  C22C21/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C2/12 ,  C23C2/26 ,  C23C2/261 ,  C23C2/29 ,  C23C2/40 ,  B32B2307/718 ,  B32B2307/732

Abstract: The present disclosure relates to an aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and a method for manufacturing the same, and more particularly, to an aluminum alloy-plated steel sheet preventing microcracks generated during hot forming and has excellent seizure resistance and corrosion resistance, and a method for manufacturing the same.

公开(公告)号：US11885025B2

公开(公告)日：2024-01-30

申请号：US17312871

申请日：2018-12-11

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki Kawata ,  Eisaku Sakurada ,  Kohichi Sano ,  Takafumi Yokoyama

IPC: C23C2/06 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/40 ,  C23C2/28 ,  C23C2/26

CPC classification number: C23C2/06 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/261 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/005

Abstract: A high-strength steel sheet includes a chemical composition including: by mass %, C: 0.080 to 0.500%, Si: 2.50% or less, Mn: 0.50 to 5.00%, P: 0.100% or less, S: 0.0100% or less, Al: 0.001 to 2.500%, N: 0.0150% or less, O: 0.0050% or less, and the balance: Fe and inevitable impurities. The high-strength steel sheet satisfying a predetermined formula has a microstructure in a region from ⅛t to ⅜t from a steel sheet surface. The microstructure includes: by volume %, 20% or more of acicular ferrite, 20% or more of an island-shaped hard structure including residual austenite, 2% to 25% of residual austenite, and 20% or less of aggregated ferrite.

公开(公告)号：US20240141470A1

公开(公告)日：2024-05-02

申请号：US18278328

申请日：2022-02-24

Applicant: ThyssenKrupp Steel Europe AG

Inventor： Fabian JUNGE ,  Burak William CENTINKAYA

IPC: C23C2/06 ,  C21D8/02 ,  C21D9/46 ,  C23C2/26 ,  C23C2/40 ,  C23C22/07 ,  C23C22/83 ,  C23G1/19

CPC classification number: C23C2/06 ,  C21D8/0278 ,  C21D9/46 ,  C23C2/261 ,  C23C2/40 ,  C23C22/07 ,  C23C22/83 ,  C23G1/19

Abstract: The invention relates to a striplike or sheetlike steel substrate hot-dip-coated with a metallic coating based on zinc and having a modified surface, and to a method for producing a semifinished product with modified surface, comprising at least one method step of at least regionally modifying the surface of a coated, skin-pass-rolled, oiled and cleaned metallic steel substrate by means of atmospheric-pressure plasma treatment of said surface regions with oxygen, air, forming gas or a mixture of 2 or more of these gases as process gas. The invention further relates to the accordingly produced semifinished products and/or flat steel products, optionally formed semifinished products and/or flat steel products, and to their use.

公开(公告)号：US20240082902A1

公开(公告)日：2024-03-14

申请号：US18385162

申请日：2023-10-30

Applicant: POSCO CO., LTD

Inventor： Hyeon-Seok Hwang ,  Il-Ryoung Sohn ,  Jong-Sang Kim

IPC: B21D22/02 ,  B21D22/20 ,  C21D1/673 ,  C21D8/00 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

CPC classification number: B21D22/02 ,  B21D22/20 ,  C21D1/673 ,  C21D8/005 ,  C23C2/06 ,  C23C2/261 ,  C23C2/29 ,  C23C2/40 ,  B21D22/022

Abstract: Disclosed are a hot press-formed article and a method for manufacturing the same. The article is manufactured by hot press forming a galvanized steel sheet comprising a base steel plate and a zinc-based coat layer formed on a surface of the base steel plate, wherein the zinc-based coat layer contains at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05% to 2.0% by weight, and a balanced amount of Zn and inevitable impurities, at least 70% by weight of the at least one element selected from the group consisting of Sb, Sn, Bi being concentrated in a region 3 μm or less distant from the surface of an alloyed zinc-based coat layer, formed by alloying the zinc-based coat layer, of the hot press-formed article.

公开(公告)号：US11795535B2

公开(公告)日：2023-10-24

申请号：US17420344

申请日：2019-12-27

Applicant: Salzgitter Flachstahl GmbH

Inventor： Marc Debeaux ,  Friedrich Luther ,  Thomas Koll

IPC: C23C2/12 ,  C23C2/28 ,  C23C2/20 ,  C21D1/25 ,  B32B15/01 ,  C22C21/02 ,  C21D1/26 ,  C25D11/04 ,  C23C28/00 ,  C23C2/40 ,  C23F1/36 ,  C23C2/26 ,  C21D1/00 ,  C25F3/04 ,  C25D11/02 ,  C23C30/00 ,  C21D8/02 ,  C21D8/00 ,  C22C21/04 ,  C23C28/02 ,  C21D9/46 ,  C21D9/48 ,  C21D1/34 ,  C21D8/04 ,  C23F3/03 ,  B32B15/04 ,  C23F3/02 ,  B32B3/00 ,  C25D11/06 ,  B32B15/18 ,  C25D11/24 ,  C25D11/08 ,  C25D11/10

CPC classification number: C23C2/12 ,  B32B3/00 ,  B32B15/012 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D1/00 ,  C21D1/25 ,  C21D1/26 ,  C21D1/34 ,  C21D8/005 ,  C21D8/0205 ,  C21D8/0278 ,  C21D8/0405 ,  C21D9/46 ,  C21D9/48 ,  C22C21/02 ,  C22C21/04 ,  C23C2/20 ,  C23C2/26 ,  C23C2/261 ,  C23C2/265 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C23C28/021 ,  C23C28/321 ,  C23C28/345 ,  C23C30/00 ,  C23C30/005 ,  C23F1/36 ,  C23F3/02 ,  C23F3/03 ,  C25D11/02 ,  C25D11/026 ,  C25D11/04 ,  C25D11/06 ,  C25D11/24 ,  C25F3/04 ,  C21D2211/001 ,  C21D2211/008 ,  C25D11/08 ,  C25D11/10 ,  Y10T428/1259 ,  Y10T428/12458 ,  Y10T428/12556 ,  Y10T428/12569 ,  Y10T428/12583 ,  Y10T428/12611 ,  Y10T428/12618 ,  Y10T428/12736 ,  Y10T428/12757 ,  Y10T428/12764 ,  Y10T428/12972 ,  Y10T428/12993 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/26 ,  Y10T428/265 ,  Y10T428/27 ,  Y10T428/273

Abstract: An aluminum-based coating of a flat steel product is applied in a hot-dipping method and comprises a mass percentage of silicon within a given range. The coating for a flat steel product, in particular for press mold hardening components, offers a shortened required minimum oven dwell time and a sufficiently large processing window when heating in an oven. This is achieved in that the surface of the coating has a degree of absorption for thermal radiation ranging between 0.35 and 0.95 prior to an annealing treatment, where the degree of absorption relates to an oven temperature ranging from 880 to 950° C. during the austenitizing annealing treatment. The invention additionally relates to an improved method for producing a flat steel product with an aluminum-based coating, to an inexpensive method for producing press-hardened components from such flat steel products, and to a press-hardened component made of such flat steel products.

公开(公告)号：US12116672B2

公开(公告)日：2024-10-15

申请号：US17596389

申请日：2020-04-24

Applicant: JFE STEEL CORPORATION

Inventor： Akito Mizutani ,  Mitsuyuki Fujisawa

IPC: C23C2/12 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/50 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

CPC classification number: C23C2/12 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/50 ,  C23C2/261 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/005

Abstract: Provided is an Al or Al alloy-coated stainless steel sheet having a coating substrate and a hot-dip Al or Al alloy coated layer provided on a surface of the coating substrate, the coating substrate having a predetermined chemical composition, the Mo content and W content of the chemical composition of the coating substrate, the thickness of the coating substrate, and the thickness of the hot-dip Al or Al alloy coated layer satisfying predetermined relations.

公开(公告)号：US12104255B2

公开(公告)日：2024-10-01

申请号：US17866628

申请日：2022-07-18

Applicant: ArcelorMittal

Inventor： Tiago Machado Amorim ,  Christian Allely ,  Gregory Leuillier

IPC: C23C2/12 ,  C21D1/673 ,  C21D8/00 ,  C21D8/02 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C22C21/10 ,  C22F1/053 ,  C23C22/07

CPC classification number: C23C2/12 ,  C21D1/673 ,  C21D8/0257 ,  C23C2/06 ,  C23C2/26 ,  C23C2/261 ,  C23C2/28 ,  C23C2/29 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A hardened part coated with a phosphatable coating is provided. The part is made by a method that includes providing a steel sheet pre-coated with a metallic coating including from 4.0 to 20.0% by weight of zinc, from 1.0 to 3.5% by weight of silicon, optionally from 1.0 to 4.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements. The steel sheet is cut to obtain a blank, the blank is thermally treated at a temperature between 840 and 950° C. to obtain a fully austenitic microstructure in the steel, the blank is transferred into a press tool and hot-formed to obtain a part. The part is cooled to obtain a martensitic or martensitic-bainitic microstructure or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.

公开(公告)号：US20240183018A1

公开(公告)日：2024-06-06

申请号：US18553206

申请日：2022-04-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Mamoru SAITO ,  Yasuto GOTO

IPC: C23C2/06 ,  C21D8/02 ,  C21D9/46 ,  C22C18/04 ,  C23C2/26 ,  C23C2/40

CPC classification number: C23C2/06 ,  C21D8/0226 ,  C21D9/46 ,  C22C18/04 ,  C23C2/261 ,  C23C2/40

Abstract: Provided is a Zn—Al—Mg alloy coated checkered steel sheet having on the sheet surface thereof convex part and flat part, wherein: the coating layer has a predetermined chemical composition, and when observing a cross section of cutting edge orthogonal to a longitudinal direction of the convex part and taken along a sheet thickness direction at a central part in the longitudinal direction of the convex part, a layer thickness ratio of the coating layer of the flat part on left and right of the convex part (layer thickness of left coating layer/layer thickness of right coating layer) is from 0.2 to 5.0, and a convex height T−t, where T is a sheet thickness of the substrate checkered steel sheet at the convex part and t is a sheet thickness of the substrate checkered steel sheet at the flat part, and a gap height x between a stationary surface and a sheet surface of the coated checkered steel sheet opposite to the stationary surface in a case in which the coated checkered steel sheet is placed in a stationary position satisfy the following Formulas 1 and 2 below.


x/(T−t)≤1.5  Formula 1:



0.5

公开(公告)号：US20240191329A1

公开(公告)日：2024-06-13

申请号：US18444558

申请日：2024-02-16

Applicant: POSCO CO., LTD

Inventor： Seong-Woo KIM ,  Jin-Keun OH ,  Yeol-Rae CHO ,  Hyeon-Jeong SHIN

IPC: C22C38/32 ,  B23K35/02 ,  B23K35/30 ,  B23K103/16 ,  B23K103/20 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

CPC classification number: C22C38/32 ,  B23K35/0238 ,  B23K35/3086 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/12 ,  C23C2/261 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  B23K2103/166 ,  B23K2103/20 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided is an Al—Fe-alloy plated steel sheet for hot forming, having excellent TWB welding characteristics since excellent hardness uniformity of a TWB weld zone after hot forming is obtained by suitably controlling a batch annealing condition, after plating Al, such that an Al—Fe-alloy layer is formed; a hot forming member; and manufacturing methods therefor.

公开(公告)号：US20240110257A1

公开(公告)日：2024-04-04

申请号：US18538254

申请日：2023-12-13

Applicant: ArcelorMittal

Inventor： David ZAPICO ALVAREZ ,  Florence BERTRAND ,  Joris GIROUX

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

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 ,  C23C2/0038 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/024 ,  C23C2/04 ,  C23C2/06 ,  C23C2/261 ,  C23C2/28 ,  C23C2/40 ,  C21D1/74 ,  C21D2201/02 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A galvannealed steel sheet ontainabel by a method 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.