公开(公告)号：WO2021254722A1

公开(公告)日：2021-12-23

申请号：PCT/EP2021/063494

申请日：2021-05-20

Applicant: SSAB TECHNOLOGY AB

Inventor： KESTI, Vili ,  LIIMATAINEN, Tommi ,  HEMMILÄ, Mikko ,  SUIKKANEN, Pasi ,  NYMANN, Erik ,  LIND, Martin ,  NILSSON, Robin ,  PYYKKÖNEN, Juha

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58 ,  C23C2/00 ,  C23C2/40 ,  C23C30/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/14 ,  C22C38/24 ,  C22C38/28 ,  C21D2211/005 ,  C21D8/0426

Abstract: A hot-rolled strip steel product having a chemical composition consisting of, in terms of weight percentages (wt. %): 0.025%-0.070% C, 0%-1.10% Si, 0.50%-2.0% Mn,

公开(公告)号：WO2021254610A1

公开(公告)日：2021-12-23

申请号：PCT/EP2020/066798

申请日：2020-06-17

Applicant: THYSSENKRUPP STEEL EUROPE AG

Inventor： LINKE, Bernd ,  KÖYER, Maria ,  BANIK, Janko ,  BÄUMER, Annette ,  MATTISSEN, Dorothea ,  ROSENSTOCK, Dirk

IPC: C21D8/04 ,  B22D11/00 ,  B22D11/041 ,  C21D9/48 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/38 ,  C21D7/13 ,  C22C38/12 ,  C22C38/14 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/40 ,  C23C30/00 ,  B22D11/001 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0463

Abstract: Zur Herstellung von für eine Umformung zu Blechbauteilen geeigneten und gut schweißbaren Stahlflachprodukten wird gemäß der Erfindung a) eine Stahlschmelze erschmolzen» die aus» in Gew.-%, C: 0,10 - 0,4, Si: 0,05 - 0,5, Mn: 0,5 - 3,0, AI: 0,01 - 0,2, Cr: 0,005 - 1,0, V: 0,001 - 0,2, sowie optional einem oder mehreren Elementen aus der Gruppe "B, Ti, Nb, Ni» Cu, Mo, W" in folgenden Gehalten B: 0,0005 - 0,01, Ti: 0,001 -0,1, Nb: 0,001 - 0,1, Ni: 0,01 - 0,4, Cu: 0,01 - 0,8, Mo: 0,002 - 1,0, W: 0,001 - 1,0, Rest Fe und unvermeidbaren Verunreinigungen besteht. Die Schmelze wird b) in einen Tundish abgegossen, von dem aus die Schmelze in eine Stranggusskokille abströmt, um einen Strang zu formen, wobei die Schmelze beim Abgießen in den Tundish eine Überhitzungstemperatur TUE aufweist, die 5 - 60 °C oberhalb ihrer Liquidustemperatur liegt, und für das aus einer Dicke Ds des Strangs und einer Gießgeschwindigkeit Vs, mit der die Schmelze in die Stranggusskokille einströmt, gebildete Produkt a gilt: amin

公开(公告)号：WO2021250450A1

公开(公告)日：2021-12-16

申请号：PCT/IB2020/055526

申请日：2020-06-12

Applicant: ARCELORMITTAL

Inventor： HOFFMANN, Etienne ,  HEBERT, Véronique

IPC: C21D1/76 ,  C21D8/02 ,  C21D9/56 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/22 ,  C21D1/22 ,  C21D1/25 ,  C21D2211/002 ,  C21D3/04 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0457 ,  C21D9/48 ,  C22C38/38

Abstract: The invention relates to a cold rolled and heat-treated steel sheet, the steel comprising, in weight percentage, 0.17% ≤ carbon ≤ 0.25%, 2% ≤ manganese ≤ 3%, 0.9% ≤ silicon ≤ 2%, 0% ≤ aluminum ≤0.09%, 0.01%≤ molybdenum ≤ 0.2%, 0%≤ phosphorus ≤ 0.02%, 0%≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.09%, and optionally one or more of the following elements 0%≤ chromium ≤ 0.3%, 0%≤ niobium ≤ 0.06%, 0%≤ titanium ≤ 0.06%, 0%≤ vanadium ≤0.1%, 0%≤ calcium ≤ 0.005%, 0%≤ boron ≤ 0.010%, 0%≤ Magnesium ≤ 0.05%, 0%≤ Zirconium ≤ 0.05%, 0%≤ Cerium ≤ 0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure comprising 50% to 80% of Bainite, 10% to 30% of residual austenite, 15% to 50% of Partitioned martensite, 0% to 10% of ferrite and 0% to 5% fresh martensite in area fractions, and a ferrite-enriched layer extending up to 50 microns from both surfaces of said steel sheet, such ferrite-enriched layer having a mean ferrite content from 55% to 80% in area fraction.

公开(公告)号：WO2021123880A1

公开(公告)日：2021-06-24

申请号：PCT/IB2019/061000

申请日：2019-12-18

Applicant: ARCELORMITTAL

Inventor： DRILLET, Josée

IPC: B32B15/01 ,  C21D6/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  C23C14/14 ,  C21D1/26 ,  B32B15/013 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D6/005 ,  C21D8/0405 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C22C38/001 ,  C22C38/002

Abstract: Cold-rolled and annealed steel sheet and manufacturing method The steel sheet has a composition comprising 0.060 % ≤ C ≤ 0.085 %, 1.8 % ≤ Mn ≤ 2.0%, 0.4% ≤ Cr ≤ 0.6%, 0.1 % ≤ Si ≤ 0.5 %, 0.010% ≤ Nb ≤ 0.025%, 3.42N ≤ Ti ≤ 0.035%, 0 ≤ Mo ≤ 0.030%, 0.020% ≤ Al ≤ 0.060%, 0.0012% ≤ B ≤ 0.0030%, S ≤ 0.005%, P ≤ 0.050%, 0.002% ≤ N ≤ 0.007% and optionally 0.0005% ≤ Ca ≤ 0.005%, the remainder of the composition being iron and unavoidable impurities. The microstructure consists of 34% to 80% bainite, 10% to 16% martensite, and 10% to 50% of ferrite. The surface fraction of unrecrystallized ferrite, with respect to the whole structure, is of less than 30%. The martensite consists of self-tempered martensite and fresh martensite, the surface fraction of self-tempered martensite being comprised between 4% and 10%.

公开(公告)号：WO2021123130A1

公开(公告)日：2021-06-24

申请号：PCT/EP2020/086977

申请日：2020-12-18

Applicant: TATA STEEL IJMUIDEN B.V.

Inventor： RIJKENBERG, Rolf , Arjan ,  CHEN, Shangping ,  AARNTS, Maxim, Peter

IPC: C21D8/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C21D2211/002 ,  C21D2211/003 ,  C21D8/0405 ,  C21D8/0426 ,  C21D8/0463

Abstract: The invention relates to a high strength steel with a careful selection of the normal alloying elements C, Mn, Si and Al, together with micro-element addition. This a steel with a high strength and high hole expansion ratio can be produced. The invention also 5 relates to the method to manufacture this high strength steel.