公开(公告)号：US20230183834A1

公开(公告)日：2023-06-15

申请号：US17924627

申请日：2021-06-03

Applicant: NIPPON STEEL CORPORATION

Inventor： Kengo TAKEDA ,  Katsuya NAKANO ,  Yuya SUZUKI ,  Eriko TSUKAMOTO

IPC: C21D9/46 ,  C21D8/02 ,  B21C47/02 ,  C23G1/08 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  B21C47/02 ,  C23G1/08 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/005 ,  C21D2211/009 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: Provided is a steel sheet having a predetermined chemical composition and microstructure, wherein a block size in a first depth region of 1 to 10 μm from the surface is 5.0 μm or less, a block size in a second depth region of 10 to 60 μm from the surface is 6.0 to 20.0 μm, and a block size in a third depth region of 60 μm to 1/4 thickness from the surface is less than 6.0 μm. Further, provided is a method for producing a steel sheet comprising a step of hot rolling a steel slab having a predetermined chemical composition, then coiling it at 500° C. or more, a step of pickling the hot rolled steel sheet to remove oxide scale, wherein an amount of removal of the surface layer of the hot rolled steel sheet is less than 5.00 μm, a step of cold rolling by a rolling reduction of 30 to 90%, and an annealing step of holding in an atmosphere of a dew point of −20 to 20° C. at a temperature region of 740 to 900° C. for 40 to 300 seconds.

公开(公告)号：US20230160032A1

公开(公告)日：2023-05-25

申请号：US17915696

申请日：2021-03-25

Applicant: JFE STEEL CORPORATION

Inventor： Lingling YANG ,  Yoshiyasu KAWASAKI ,  Hidekazu MINAMI ,  Tatsuya NAKAGAITO ,  Shotaro TERASHIMA ,  Shunsuke YAMAMOTO ,  Katsuya HOSHINO ,  Yuki TAKEDA

IPC: C21D9/46 ,  C23C2/40 ,  C23C2/06 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B21C47/02

CPC classification number: C21D9/46 ,  C23C2/40 ,  C23C2/06 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B21C47/02 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/001

Abstract: A steel sheet having a tensile strength (TS) of 780 MPa or more and less than 1180 MPa, high LME resistance, and good weld fatigue properties. The steel sheet has a specific chemical composition and a specific steel microstructure. Crystal grains containing an oxide of Si and/or Mn in a region within 4.9 μm in a thickness direction from a surface of the steel sheet have an average grain size in the range of 3 to 10 μm, the lowest Si concentration LSi and the lowest Mn concentration LMn in the region within 4.9 μm in the thickness direction from the surface of the steel sheet and a Si concentration TSi and a Mn concentration TMn at a quarter thickness position of the steel sheet satisfy a specified formula.

公开(公告)号：US11655531B2

公开(公告)日：2023-05-23

申请号：US16647747

申请日：2018-09-14

Applicant: ThyssenKrupp Steel Europe AG ,  thyssenkrupp AG

Inventor： Robert Yanik ,  Friedhelm Macherey ,  Bastian Schöntaube ,  Frank Vennemann ,  Jennifer Schulz ,  Folkert Schulze-Kraasch

IPC: C23C2/20 ,  B32B15/01 ,  C22C18/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/00 ,  C23C2/06 ,  C23C2/40

CPC classification number: C23C2/20 ,  B32B15/012 ,  B32B15/013 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/003 ,  C23C2/06 ,  C23C2/40

Abstract: The present invention relates to a method of hot dip coating of flat steel products, comprising a step of stripping the coated steel strip by means of at least one nozzle that emits a stripping gas having a temperature T3 at an angle α in the direction of the coated steel strip, wherein the angle α, the distance h between the surface of the melt bath and the lower edge of the nozzle in mm, the temperature of the stripping gas in ° C. and the differential between the temperature T2 of the melt bath and the temperature T1 of the steel strip are in a particular relationship to one another, and to a correspondingly produced hot dip-coated flat steel product.

公开(公告)号：US11655516B2

公开(公告)日：2023-05-23

申请号：US16467643

申请日：2017-12-15

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Marc Olivier Thenot

IPC: C21D9/46 ,  C21D1/20 ,  C21D1/22 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/012 ,  C21D1/20 ,  C21D1/22 ,  C21D8/0263 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B2605/08 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C2204/00

Abstract: A tempered and coated steel sheet having a composition containing the following elements, expressed in percentage by weight:



0.17%≤carbon≤0.25%,
1.8%≤manganese≤2.3%,
0.5%≤silicon≤2.0%,
0.03%≤aluminum≤1.2%,
sulphur≤0.03%,
phosphorus≤0.03%,

the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet containing in area fraction, 4 to 20% residual austenite, 0 to 15% of ferrite, 40 to 85% tempered bainite and a minimum of 5% of tempered martensite, wherein the cumulated amounts of tempered martensite and residual austenite is between 10 and 30%. The composition may also contain one or more of the following elements: chromium≤0.4%, molybdenum≤0.3%, niobium≤0.04%, titanium≤0.1%. Manufacturing methods and use of tempered and coated steel sheet for making vehicle parts are also described.

公开(公告)号：US11643714B2

公开(公告)日：2023-05-09

申请号：US17729491

申请日：2022-04-26

Applicant: POSCO

Inventor： Il-Ryoung Sohn ,  Tae-Chul Kim ,  Jung-Kuk Kim ,  Kyung-Jin An ,  Jung-Hoon Kim ,  Jong-Un Jung ,  Jin-Seo Park

IPC: C23C2/20 ,  C23C2/06 ,  C23C2/28 ,  C23C2/14 ,  C23C2/26 ,  C23C2/40 ,  C23C28/02 ,  C23C30/00 ,  C23C18/00 ,  C23C18/04 ,  C22C18/04 ,  C22C18/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C23C2/00 ,  C23C2/12 ,  C23C2/16

CPC classification number: C23C2/20 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/14 ,  C23C2/16 ,  C23C2/26 ,  C23C2/261 ,  C23C2/28 ,  C23C2/40 ,  C23C2/50 ,  C23C2/522 ,  C23C2/525 ,  C23C18/00 ,  C23C18/04 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C30/00 ,  C23C30/005 ,  Y10T428/12799 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/2495 ,  Y10T428/24959 ,  Y10T428/24967 ,  Y10T428/26 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

Abstract: The present disclosure relates to a plated steel material that can be used in an automobile, a household appliance, a building material, and the like, and more particularly, to a zinc alloy plated steel material having excellent surface quality and corrosion resistance, and a method for manufacturing the same.

公开(公告)号：US11643701B2

公开(公告)日：2023-05-09

申请号：US17425096

申请日：2019-10-18

Applicant: JFE Steel Corporation

Inventor： Shinsuke Komine ,  Tatsuya Nakagaito ,  Kentaro Sato ,  Tomohiro Sakaidani

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C23C2/06 ,  C23C2/40 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

Abstract: The high-strength hot-dip galvanized steel sheet, which includes a hot-dip galvanized coating layer on a surface of the steel sheet, has a component composition containing, in mass %, C: 0.07% to 0.20%, Si: 0.1% to 2.0%, Mn: 2.0% to 3.5%, P: 0.05% or less, S: 0.05% or less, and sol. Al: 0.005% to 0.1%, with the balance being Fe and incidental impurities; and has a steel microstructure containing, in area fraction, 60% or less of ferrite, 40% or more of tempered martensite, and 10% or less of fresh martensite and having a void number density of 1,500/mm2 or less in a bent portion in the VDA bending test.

公开(公告)号：US11634819B2

公开(公告)日：2023-04-25

申请号：US17731862

申请日：2022-04-28

Applicant: POSCO ,  NOROO COIL COATINGS CO., LTD.

Inventor： Soo-Hyoun Cho ,  Dae-Chul Bae ,  Dong-Yun Kim ,  Chang-Hyun Park

IPC: C23C22/42 ,  C23C2/06 ,  C23C2/26 ,  C23C2/40 ,  C23C22/44 ,  C09D5/08 ,  C23C22/40 ,  C09D5/10 ,  C22C18/04 ,  C22C18/00 ,  C23C22/07 ,  G06N20/20 ,  G06N3/04 ,  G06N3/08 ,  G06T11/00

Abstract: Provided is a solution composition for steel sheet surface treatment, comprising 30 wt % to 60 wt % of a trivalent chromium compound containing chromium phosphate (A) and chromium nitrate (B); 0.2 wt % to 0.4 wt % of a rust-inhibiting and corrosion-resisting agent; 0.1 wt % to 0.3 wt % of a molybdenum-based compound; 5 wt % to 10 wt % of a water-soluble cationic urethane resin; 0.5 wt % to 2.0 wt % of a silane coupling agent; and 27.3 wt % to 64.2 wt % of water, a zinc-based plated steel sheet surface-treated with the same, and a manufacturing method therefor, the zinc-based plated steel sheet surface-treated with the solution composition for steel sheet surface treatment containing trivalent chromium may have an excellent effect on corrosion resistance, blackening resistance, fingerprint resistance, oil resistance, and alkali resistance.

公开(公告)号：US11597986B2

公开(公告)日：2023-03-07

申请号：US17251302

申请日：2019-06-12

Applicant: ThyssenKrupp Steel Europe AG ,  thyssenkrupp AG

Inventor： Manuela Irnich ,  Rainer Fechte-Heinen ,  Miriam Lange ,  Bernd Linke ,  Jan-Hendrik Rudolph ,  Richard G. Thiessen

IPC: C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/20 ,  C22C38/22 ,  C22C38/32 ,  C22C38/40 ,  C21D8/04 ,  C23G1/00 ,  C22C38/06 ,  C23C2/06

Abstract: The present invention relates to a flat steel product which has good deep-drawing ability, low edge-crack sensitivity and good bending behaviour. To this end, the flat steel product contains a steel which consists of (in wt %) 0.1-0.5% C, 1.0-3.0% Mn, 0.9-1.5% Si, up to 1.5% Al, up to 0.008% N, up to 0.020% P, up to 0.005% S, 0.01-1% Cr and optionally one or more of the following elements: up to 0.2% Mo, up to 0.01% B, up to 0.5% Cu, up to 0.5% Ni and optionally a total of 0.005-0.2% microalloying elements, the remainder being iron and unavoidable impurities, wherein 75

公开(公告)号：US11591685B2

公开(公告)日：2023-02-28

申请号：US16759275

申请日：2018-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Yu Matsumoto ,  Shigeru Hashimoto ,  Koichi Nishizawa

IPC: C23C2/28 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/14 ,  C22C38/12 ,  C22C38/16 ,  B32B15/01 ,  C22C18/04 ,  C22C38/08

Abstract: [Object] What is provided is a manufacturing method of a galvannealed steel sheet capable of further promoting alloying of zinc plating with the steel sheet.
[Resolution Means] A manufacturing method of a galvannealed steel sheet, including: forming on a surface of a steel sheet after hot rolling and pickling which contains, by mass %, C: 0.001% to 0.350%, Si: 0.001% to 2.500% or P: 0.001% to 0.100%, or combination thereof, Mn: 0.10% to 3.00%, S: 0.001% to 0.010%, N: 0.0010% to 0.0065%, and sol. Al: 0.001% to 0.800% with a remainder being Fe and impurities, grooves having an opening surface width of 10 μm to 25 μm and a depth of 10 μm to 30 μm at intervals of 20 μm to 500 μm; cold rolling the steel sheet at a rolling reduction of 30% or more; reduction annealing the steel sheet after the cold rolling; immersing the steel sheet in a hot-dip galvanizing bath containing 0.10 mass % to 0.20 mass % of Al with a remainder consisting of Zn and optional components, and adhering a hot-dip galvanized layer to the surface of the steel sheet; and heating the steel sheet to which the hot-dip galvanized layer is adhered, and alloying the steel sheet with the hot-dip galvanized layer.

公开(公告)号：US11591665B2

公开(公告)日：2023-02-28

申请号：US16956390

申请日：2018-12-18

Applicant: ArcelorMittal

Inventor： Coralie Jung ,  Astrid Perlade ,  Kangying Zhu ,  Frédéric Kegel

IPC: C01D9/00 ,  C21D8/00 ,  C22C38/00 ,  C23C2/12 ,  C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/32 ,  C23C2/06

Abstract: A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.