公开(公告)号：WO2022123299A1

公开(公告)日：2022-06-16

申请号：PCT/IB2020/061771

申请日：2020-12-10

申请人： ARCELORMITTAL [LU]/[LU]

发明人： LORENZINI, Pascal ,  GARAT, Xavier

IPC分类号： C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38

摘要： A low density cold rolled and annealed steel sheet comprising of 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)3AICx, where x is strictly lower than 1.

公开(公告)号：WO2022123289A1

公开(公告)日：2022-06-16

申请号：PCT/IB2020/061639

申请日：2020-12-08

申请人： ARCELORMITTAL [LU]/[LU]

发明人： ARLAZAROV, Artem ,  PIPARD, Jean-Marc

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/38 ,  C22C38/26 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： A cold rolled and heat treated steel sheet having a composition comprising of the following elements 0.1%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.01%≤Aluminum≤1.5%, 0.05%≤Chromium≤1%, 0.001%≤ Niobium≤0.1%, 0%≤Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01%, 0%≤Molybdenum≤0.5%, 0.001%≤Titanium≤0.1%, 0.01% ≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001 % ≤ Calcium ≤ 0.005 %, 0 % ≤ Vanadium ≤ 0.1 %, 0 % ≤ Boron ≤ 0.003 %, 0 % ≤ Cerium≤ 0.1 %, 0 % ≤ Magnesium≤ 0.010 %, 0 % ≤ Zirconium≤ 0.010 % the remainder composition being composed of iron and the unavoidable impurities, and a microstructure of the said rolled steel sheet comprises by area fraction, 10% to 60% Bainite, 5% to 50% Ferrite, 5% to 25% Residual Austenite, Martensite 2% to 20%, Tempered Martensite 0% to 25%, the balance being Annealed Martensite, which content shall be from 1% to 45%.