COLD ROLLED AND COATED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

A cold rolled and heat treated steel sheet having a composition having the following elements: 0.13%≤Carbon≤0.18%, 1.1%≤Manganese≤1.8%, 0.5%≤Silicon≤0.9%, 0.6%≤Aluminum≤1%, 0.002%≤Phosphorus≤0.02%, 0%≤Sulfur≤0.003%, 0%≤Nitrogen≤0.007% and can contain one or more of the following optional elements: 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 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 iron and unavoidable impurities caused by processing, the microstructure of the steel sheet being in area fraction, 60 to 75% Ferrite, 20 to 30% Bainite, 10 to 15% Residual Austenite, and 0% to 5% Martensite, wherein the cumulated amounts of Residual Austenite and Ferrite is between 70% and 80%.