公开(公告)号：US11913089B2

公开(公告)日：2024-02-27

申请号：US17263217

申请日：2019-07-25

Applicant: POSCO

Inventor： Min-Seo Koo ,  Tae-Jin Song

IPC: C21D9/50 ,  B32B15/01 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/02

CPC classification number: C21D9/50 ,  B32B15/013 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C23C2/02 ,  C23C2/022 ,  C23C2/024 ,  C21D2211/001 ,  C21D2211/005

Abstract: Provided is a density clad steel sheet having excellent strength and plateability, the clad steel sheet including a base metal, and a clad material provided at both sides of the base metal, wherein the base metal is a ferrite-austenitic duplex lightweight steel sheet comprising, by wt %, 0.3-0.7% of C, 2.0-9.0% of Mn, 4.5-8.0% of Al and the balance of Fe and inevitable impurities, and the clad material is a ferrite carbon steel comprising, by wt %, 0.0005-0.2% of C, 0.05-2.5% of Mn and the balance of Fe and inevitable impurities.

公开(公告)号：US20240063399A1

公开(公告)日：2024-02-22

申请号：US18265798

申请日：2021-12-13

Applicant: JFE Steel Corporation

Inventor： Takayoshi Yano ,  Akito Mizutani ,  Kazuhiko Ikeda ,  Tomoko Fujii ,  Hiroshi Matsunaga

IPC: H01M4/66 ,  C22C38/50 ,  C22C38/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: H01M4/669 ,  H01M4/662 ,  C22C38/50 ,  C22C38/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001

Abstract: Provided is a chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery. The chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery has a chemical composition containing Cr in an amount of 10% by mass or more. A parameter Sa defined in ISO 25178 is from 0.15 μm to 0.50 μm inclusive, and a parameter Ssk defined in ISO 25178 is more than 0.

公开(公告)号：US20240060161A1

公开(公告)日：2024-02-22

申请号：US18267428

申请日：2021-12-01

Applicant: POSCO CO., LTD

Inventor： Jae-Hoon LEE ,  Ki-Taek JUNG

IPC: C22C38/04 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06

CPC classification number: C22C38/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06

Abstract: Provided is a steel sheet that may be used for automobile parts and the like, and to a steel sheet having an excellent balance of strength and ductility, an excellent balance of strength and hole expansion ratio, and an excellent yield ratio evaluation index, and a method for manufacturing the same. The steel sheet includes: by wt %, C: 0.1 to 0.25%, Si: 0.01 to 1.5%, Mn: 1.0 to 4.0%, Al: 0.01 to 1.5%, P: 0.15% or less, S: 0.03% or less, N: 0.03% or less, B: 0.0005 to 0.005%, a balance of Fe, and unavoidable impurities; and as microstructures, bainite, tempered martensite, fresh martensite, retained austenite and unavoidable structures.

公开(公告)号：US20240052466A1

公开(公告)日：2024-02-15

申请号：US18267900

申请日：2021-12-24

Applicant: JFE Steel Corporation

Inventor： Taiyo Asakawa ,  Shimpei Yoshioka ,  Shinjiro Kaneko

IPC: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C22C38/14 ,  C21D8/02

CPC classification number: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/001 ,  C22C38/12 ,  C22C38/14 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0205 ,  C21D2211/008

Abstract: Provided are a steel sheet and a member, having high strength and high delayed fracture resistance, and methods for manufacturing the steel sheet and the member. The steel sheet has a specific chemical composition and a microstructure in which the area fraction of martensite is 95% to 100%, with the balance being one or more of bainite, ferrite, and retained austenite. In the steel sheet, prior-austenite grains have an average grain size of 18 μm or less, 90 mass % or more of the total content of Nb and Ti contained is present as a carbonitride having an equivalent circular diameter of 100 nm or more, and a Nb carbonitride and a Ti carbonitride, having an equivalent circular diameter of 1.0 μm or more, are present at a rate of 800 pieces/mm2 or less in total. The steel sheet has a tensile strength of 1310 MPa or more.

公开(公告)号：US20240052465A1

公开(公告)日：2024-02-15

申请号：US18265316

申请日：2020-12-10

Applicant: ArcelorMittal

Inventor： Pascal LORENZINI ,  Xavier GARAT

IPC: C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C21D8/00

CPC classification number: C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/005 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/004

Abstract: A low density cold rolled and annealed steel sheet having 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron, the steel sheet having a microstructure comprising 60% to 90% Delta ferrite, 8% to 30% of residual austenite having average grain size between 0.6 and 2 microns, 1.0% to 10% of alpha-ferrite having average grain size between 0.6 and 2 microns and 0% to 2% of kappa precipitates (Fe,Mn)3AlCx, where x is strictly lower than 1.

公开(公告)号：US20240052453A1

公开(公告)日：2024-02-15

申请号：US18267556

申请日：2021-11-18

Applicant: POSCO

Inventor： Junmo LEE ,  Seok-hwan CHOI ,  Myungsoo CHOI

IPC: C21D9/52 ,  C22C38/34 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/06 ,  C21D6/00 ,  C21D1/84 ,  C21D1/18 ,  B21F3/02 ,  F16F1/04

CPC classification number: C21D9/525 ,  C22C38/34 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/002 ,  C22C38/001 ,  C21D8/065 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/84 ,  C21D1/18 ,  B21F3/02 ,  F16F1/04 ,  C22C2202/02 ,  C21D2211/009 ,  C21D2211/001

Abstract: Disclosed are a wire rod and a steel wire for a spring, a spring with improved fatigue resistance and nitriding property, and methods for manufacturing same. The wire rod for a spring with improved fatigue resistance and nitriding property according to the present disclosure contains, by wt %, 0.6-0.7% of C, 2.0-2.5% of Si, 0.2-0.5% of Mn, 0.9-1.6% of Cr, 0.015% of less of P, 0.01% of less of S, 0.01% of less of Al, 0.007% of less of N, 0.1-0.25% of Mo, 0.1-0.25% of V, and Fe and inevitable impurities as the balance, wherein Cr+Mn is 1.8% or less, Mo/V is 1.5 or less, and the microstructure includes 60% or more of a pearlite structure in the C section.

公开(公告)号：US20240052449A1

公开(公告)日：2024-02-15

申请号：US17766398

申请日：2020-09-25

Applicant: JFE Steel Corporation

Inventor： Yoshiyasu Kawasaki ,  Yuki Toji ,  Muneka Iwasawa ,  Takayuki Futatsuka ,  Kentaro Sato

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/16 ,  C22C38/60 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C23C2/02 ,  C25D5/36 ,  C23C2/40 ,  C23C2/06 ,  C25D3/22 ,  C25D7/06

CPC classification number: C21D9/46 ,  C22C38/38 ,  C22C38/16 ,  C22C38/60 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C23C2/0224 ,  C25D5/36 ,  C23C2/40 ,  C23C2/06 ,  C25D3/22 ,  C25D7/0614 ,  C21D2211/008 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/001

Abstract: A high strength steel sheet has a yield-point elongation of 1% or greater and a tensile strength of 980 MPa or greater. The high strength steel sheet has a specific chemical composition and microstructure. A ratio of retained austenite grains adjoining a retained austenite grain having a different crystal orientation to total retained austenite grains is 0.60 or greater, the ferrite has an average grain size of 5.0 μm or less, and the retained austenite has an average grain size of 2.0 μm or less. A value obtained by dividing a volume fraction Vγa by a volume fraction Vγb is 0.40 or greater, where the volume fraction Vγa is a volume fraction of retained austenite in a fractured portion of a tensile test specimen after a warm tensile test at 150° C., and the volume fraction Vγb is a volume fraction of retained austenite before the warm tensile test at 150° C.

公开(公告)号：US20240047107A1

公开(公告)日：2024-02-08

申请号：US18276857

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Yoshiaki NATORI ,  Hiroyasu FUJII ,  Shinsuke TAKATANI

IPC: H01F1/147 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46 ,  C21D6/00 ,  C23C22/03

CPC classification number: H01F1/14783 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C23C22/03 ,  C22C2202/02

Abstract: This non-oriented electrical steel sheet includes a base steel sheet (10); and an insulation coating (20) formed on a surface of the base steel sheet (10), in which the insulation coating (20) contains a metal phosphate and an organic resin, an arithmetic mean of a center line average roughness Ra75 of the insulation coating (20) in a rolling direction of the base steel sheet (10) and a center line average roughness Ra75 of the insulation coating (20) in a direction perpendicular to the rolling direction is 0.20 to 0.50 μm, and the amount of nitrogen in the insulation coating (20) is 0.05 to 5.00 mass %.

公开(公告)号：US20240044233A1

公开(公告)日：2024-02-08

申请号：US18256589

申请日：2021-12-09

Applicant: SPM Oil & Gas Inc.

Inventor： Jacob BAYYOUK ,  Alastair Scott PEARSON ,  Frank HIPPENSTIEL ,  Michael MULLER

IPC: E21B43/26 ,  F04B53/16 ,  F04B1/0404 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/58

CPC classification number: E21B43/2607 ,  F04B53/16 ,  F04B1/0404 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C22C38/58 ,  C22C38/004

Abstract: The present disclosure relates to a resistant steel composition comprising a nickel content from about 3% MB to about 4% MB; a manganese content from about 0.5% MB to about 1.5% MB; a chromium content from about 12% MB to about 13.4% MB; a molybdenum content from about 0.3% MB to about 0.7% MB; and a copper content of less than about 0.40% MB. In some embodiments, the present disclosure relates to a process for generating a resistant steel composition, the process comprising melting one or more resistant steel components together to form a melted steel; refining the melted steel to form a refined steel; and purifying the refined steel to form the resistant steel composition.

公开(公告)号：US11890694B2

公开(公告)日：2024-02-06

申请号：US16901765

申请日：2020-06-15

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Yoshiaki Nakazawa ,  Tohru Okada ,  Yasuhiro Ito ,  Masanori Yasuyama ,  Yasunori Sawa

IPC: B23K11/16 ,  B23K11/11 ,  B23K11/30 ,  B23K11/31 ,  B23K35/02 ,  B23K101/00 ,  B23K101/18 ,  B23K103/04 ,  B23K101/28 ,  C22C38/38 ,  C22C38/02 ,  C22C38/00 ,  C22C38/18 ,  C22C38/06 ,  C22C38/04 ,  F16B5/08

CPC classification number: B23K11/16 ,  B23K11/115 ,  B23K11/3009 ,  B23K11/31 ,  B23K35/02 ,  B23K35/0205 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/38 ,  F16B5/08 ,  B23K2101/006 ,  B23K2101/18 ,  B23K2101/185 ,  B23K2101/28 ,  B23K2103/04

Abstract: There is provided a resistance spot welding apparatus including a first rod-shaped electrode body, second rod-shaped electrode body, first ring-shaped member, second ring-shaped member, first elastic body, and second elastic body. The first rod-shaped electrode body and second rod-shaped electrode body are arranged facing each other, the first rod-shaped electrode body is inserted into a through hole of the first ring-shaped member, the first elastic body is connected to an opposite side of first ring-shaped member to second rod-shaped electrode body side, the first rod-shaped electrode body and first ring-shaped member are not electrically connected to each other, the second rod-shaped electrode body is inserted into a through hole of the second ring-shaped member, the second elastic body is connected to an opposite side of second ring-shaped member to first rod-shaped electrode body side, and the second rod-shaped electrode body and second ring-shaped member are not electrically connected each other.