COLD ROLLED STEEL SHEET, METHOD OF MANUFACTURING AND VEHICLE

摘要

The invention deals with a cold rolled and hot dip coated steel sheet presenting a tensile strength above 1000 - 50xAI MPa, a uniform elongation above 15% and a low density. The steel comprises, by weight percent: 0.1 ≤ C ≤ 0.5%, 3.5 ≤ Mn ≤ 10.0%, 0 ≤ Al ≤ 9.0%, Si ≤ 5.0%, Ti ≤ 0.2%, V ≤ 0.2%, Nb ≤ 0.2%, S ≤ 0.004 %, P ≤ 0.025 %, 0.5 ≤ Si+AI ≤ 9.0%, B ≤ 0.0035, Cr ≤ 1%, The balance being Fe and impurities and the microstructure containing 25% to 90% of ferrite, 10% to 50 % of austenite, kappa precipitates lower than 5% and martensite lower than 25%. The steel according to the invention presents the ability to be coated using total oxidation.