公开(公告)号：WO2022064248A1

公开(公告)日：2022-03-31

申请号：PCT/IB2020/058873

申请日：2020-09-23

申请人： ARCELORMITTAL

发明人： PACHON RODRIGUEZ, Edgar, Alejandro ,  BLESSE, Virginie ,  SERRA, Doriane

IPC分类号： C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/26 ,  C22C38/48 ,  C22C38/00 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C23C2/02

摘要： A cold rolled and coated steel sheet, the steel comprising 0.30% ≤ carbon ≤ 0.45%, 1% ≤ manganese ≤ 2.5%, 0.9% ≤ silicon ≤ 2.2%, 0% ≤ aluminum ≤0.09%, 0.001%≤ niobium ≤ 0.09%, 0%≤ phosphorus ≤ 0.02%, 0%≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.09%, and optionally one or more of the following elements 0%≤ molybdenum ≤ 0.5%, 0%≤ chromium ≤ 0.6%, 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 35% to 65% Partitioned Martensite, 15% to 40% of Bainite, 14% to 30% of residual austenite, 4% to 15% of ferrite and 0% to 10% fresh martensite in area fractions, the balance being partitioned martensite.