公开(公告)号：US20240209485A1

公开(公告)日：2024-06-27

申请号：US18557354

申请日：2022-04-29

Applicant: ArcelorMittal

Inventor： Sebastian COBO ,  François STOUVENOT ,  Emmanuel LUCAS

IPC: C22C38/22 ,  C21D1/673 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/26 ,  C22C38/32

CPC classification number: C22C38/22 ,  C21D1/673 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/26 ,  C22C38/32 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008

Abstract: A steel sheet made of a steel having a composition including, C: 0.3-0.4%, Mn: 0.5-1.0%, Si: 0.4-0.8%, Cr: 0.1-1.0%, Mo: 0.1-0.5%, Nb: 0.01-0.1%, Al: 0.01-0.1%, Ti: 0.008-0.03%, B: 0.0005-0.003%, P≤0.020%, Ca≤0.001%, S≤0.004%, N≤0.005% and including optionally Ni

公开(公告)号：US20240218476A1

公开(公告)日：2024-07-04

申请号：US18557348

申请日：2022-04-29

Applicant: ArcelorMittal

Inventor： Sebastian COBO ,  François STOUVENOT ,  Emmanuel LUCAS

IPC: C21D8/00 ,  B32B15/01 ,  C21D1/18 ,  C21D6/00 ,  C21D9/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D8/005 ,  B32B15/01 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/0068 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C21D2211/008

Abstract: A steel sheet made of a steel having a composition including, C: 0.3-0.4%, Mn: 0.5-1.0%, Si: 0.4-0.8%, Cr: 0.1-1.0%, Mo: 0.1-0.5%, Nb: 0.01-0.1%, Al: 0.01-0.1%, Ti: 0.008-0.03%, B: 0.0005-0.003%, P≤0.020%, Ca≤0.001%, S≤0.004%, N≤0.005% and including optionally Ni

公开(公告)号：US20230019292A1

公开(公告)日：2023-01-19

申请号：US17943561

申请日：2022-09-13

Applicant: ArcelorMittal

Inventor： Sebastian COBO ,  Christian ALLELY ,  Martin BEAUVAIS ,  Anis AOUAFI ,  Emmanuel LUCAS

IPC: C21D9/48 ,  C22C38/02 ,  C22C38/44 ,  C22C38/54 ,  C21D8/02 ,  C21D1/673 ,  C22C38/00 ,  C22C38/50 ,  C21D6/00 ,  C23C2/06 ,  C22C38/48 ,  C22C38/06 ,  C23C2/40 ,  B32B15/01 ,  C23C2/28 ,  C23C2/02 ,  C23C2/12 ,  C22C38/04

Abstract: A rolled steel sheet, for press hardening is provided, having a chemical composition where Ti/N>3.42, and the carbon, manganese, chromium and silicon contents satisfy: 2.6 C + Mn 5.3 + Cr 13 + Si 15 ≥ 1.1 % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth Δ, such that: Nisurf>Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within Δ: ( Ni max + Ni nom ) 2 × ( Δ ) ≥ 0.6 , and such that: ( Ni max - Ni nom ) Δ ≥ 0.01 and the surface density of all of the particles Di , and the surface density of the particles D(>2 μm) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.75 D(>2 μm) 2 μm) being expressed as number of particles per square millimeter, and said particles denoting all the oxides, sulfides, and nitrides, either pure or combined such as oxysulfides and carbonitrides, present in the steel matrix.

公开(公告)号：US20250003037A1

公开(公告)日：2025-01-02

申请号：US18811384

申请日：2024-08-21

Applicant: ArcelorMittal

Inventor： Sebastian COBO ,  Emmanuel LUCAS ,  Matthieu SALIB ,  Guillaume STECHMANN

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

Abstract: A steel sheet has a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk includes an inclusion population in which the sum of clustering indexes of MnS and TiN/Ti(C,N) inclusions is less than or equal to 300 μm/mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or lower than 7°.

公开(公告)号：US20240254586A1

公开(公告)日：2024-08-01

申请号：US18625591

申请日：2024-04-03

Applicant: ArcelorMittal

Inventor： Sebastian COBO ,  Christian ALLELY ,  Martin BEAUVAIS ,  Anis AOUAFI ,  Emmanuel LUCAS

IPC: C21D9/48 ,  B32B15/01 ,  C21D1/673 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/48 ,  B32B15/012 ,  B32B15/013 ,  C21D1/673 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/022 ,  C23C2/024 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/002 ,  C21D2211/008

Abstract: A method for manufacture of a hot-rolled steel sheet which includes: producing a liquid steel to which manganese, silicon, niobium, and chromium are added, the additions being made in a vacuum chamber, then desulfurizing the liquid metal without increasing its nitrogen content, then adding titanium, said additions being made so as to obtain a liquid metal having a chemical composition where the titanium and nitrogen contents satisfy: Ti/N>3.42, and the carbon, manganese, chromium, and silicon contents satisfy: 2.6C+Mn/5.3+Cr/13+Si/15>=1.1%, then casting a semi-finished product, then heating said semi-finished product to a temperature between 1250° C. and 1300° C. for a holding period at this temperature between 20 minutes and 45 minutes, then hot rolling said semi-finished product to a rolling end temperature TFL between 825° C. and 950° C., to obtain a hot-rolled sheet, then coiling said hot-rolled sheet at a temperature between 500° C. and 750° C. to obtain a hot-rolled and coiled sheet, then pickling the oxide layer formed in the previous steps.

公开(公告)号：US20220025480A1

公开(公告)日：2022-01-27

申请号：US17311677

申请日：2018-12-18

Applicant: ArcelorMittal

Inventor： Blandine REMY ,  Thierry STUREL ,  Emmanuel LUCAS ,  Gianni BOI

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21D22/02

Abstract: A press hardened coated steel part with high resistance to delayed fracture, the coating containing (Fex—Aly) intermetallic compounds resulting from the diffusion of iron into an aluminum or an aluminum-based alloy, or an aluminum alloy of a precoating, wherein the chemical composition of the steel includes, in weight: 0.16%≤C≤0.42%, 0.1%≤Mn≤3%, 0.07%≤Si≤1.60%, 0.002%≤Al≤0.070%, 0.02%≤Cr≤1.0%, 0.0005≤B≤0.005%, 0.002%≤Mg≤0.007%, 0.002%≤Ti≤0.11%, 0.0008%≤O≤0.005%, wherein (Ti)×(O)2×107≤2, 0.001%≤N≤0.007%, 0.001%≤S≤0.005%, 0.001%≤P≤0.025% and optionally one or more elements selected from the list of: 0.005%≤Ni≤0.23%, 0.005%≤Nb≤0.060%, the remainder being Fe and unavoidable impurities, and wherein the microstructure includes at least 95% martensite.