公开(公告)号：US20230340630A1

公开(公告)日：2023-10-26

申请号：US18027303

申请日：2020-09-23

Applicant: ArcelorMittal

Inventor： Edgar Alejandro PACHON RODRIGUEZ ,  Virginie BLESSE ,  Doriane SERRA

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

CPC classification number: C21D8/0236 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/12 ,  C21D8/0226 ,  C21D8/0273 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C21D2211/008 ,  C21D2211/002 ,  C21D2211/001 ,  C21D2211/005

Abstract: A cold rolled and coated steel sheet, the steel including 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.