Abstract: A heat treated cold rolled steel sheet with the following elements, 0.1%?C?0.2%; 1.2%?Mn?2.2%; 0.05%?Si?0.6%; 0.001%?Al?0.1%; 0.01%?Cr?0.5 %; 0%?S?0.09%; 0%?P?0.09%; 0%?N?0.09%; 0%?Mo?0.5%; 0%?Ti?0.1%; 0%?Nb?0.1%; 0%?V?0.1%; 0%?Ni?1%; 0%?Cu?1%; 0%?Ca?0.005%; 0%?B?0.05%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel having, by area percentage, 60% to 85% of tempered martensite, a cumulated amount of ferrite and bainite of 15% to 38%, an optional amount of residual austenite of 0% to 5% and an optional amount of fresh martensite of 0 to 5%.

Abstract: A heat treated and cold rolled steel sheet having a composition including of the following elements 0.09%?Carbon?0.15%, 1.8%?Manganese?2.5%, 0.2%?Silicon?0.7%, 0.01%?Aluminum?0.1%, 0%?Phosphorus?0.09%, 0%?Sulfur?0.09%, 0%?Nitrogen?0.09%, 0%?Niobium?0.1%, 0%?Titanium?0.1%, 0%?Chromium?1%, 0%?Molybdenum?1%, 0%?Vanadium?0.1%, 0%?Calcium?0.005%, 0%?Boron?0.01%, 0%?Cerium?0.1%, 0%?Magnesium?0.05%, 0%?Zirconium?0.05% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 65 to 85% Tempered Martensite, 0% to 5% Residual Austenite and a cumulative presence of Ferrite and Bainite between 15 and 35%.

Abstract: A heat treated and cold rolled steel sheet having a composition including of the following elements 0.09%?Carbon?0.15%, 1.8%?Manganese?2.5%, 0.2%?Silicon?0.7%, 0.01%?Aluminum?0.1%, 0%?Phosphorus?0.09%, 0%?Sulfur?0.09%, 0%?Nitrogen?0.09%, 0%?Niobium?0.1%, 0%?Titanium?0.1%, 0%?Chromium?1%, 0%?Molybdenum?1%, 0%?Vanadium?0.1%, 0%?Calcium?0.005%, 0%?Boron?0.01%, 0%?Cerium?0.1%, 0%?Magnesium?0.05%, 0%?Zirconium?0.05% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 65 to 85% Tempered Martensite, 0% to 5% Residual Austenite and a cumulative presence of Ferrite and Bainite between 15 and 35%.

Abstract: A cold rolled martensitic steel sheet including the following elements, 0.3%?C?0.4%; 0.5% ?Mn?1%; 0.2%?Si?0.6%; 0.1%?Cr?1%; 0.01%?Al?1%; 0.01%?Mo?0.5%; 0.001%?Ti?0.1%; 0%?S?0.09%; 0%?P?0.09%; 0%?N?0.09%; 0%?Nb?0.1%; 0%?V?0.1%; 0%?Ni?1%; 0%?Cu?1%; 0%?B?0.05%; 0.001%?Ca?0.01%; 0%?Sn?0.1%; 0%?Pb?0.1%; 0%?Sb?0.1%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of steel, by area percentage, at least 95% of martensite, a cumulated amount of ferrite and bainite between 1% and 5%, and an optional amount of residual austenite between 0% and 2%.

Abstract: A cold rolled martensitic steel sheet including the following elements, expressed in percentage by weight: 0.1%?C?0.2%; 1.5%?Mn?2.5%; 0.1%?Si?0.25%; 0.1%?Cr?1%; 0.01%?Al?0.1%; 0.001%?Ti?0.1%; 0%?S?0.09%; 0%?P?0.09%; 0%?N?0.09%; and can contain one or more of the following optional elements 0%?Ni?1%; 0%?Cu?1%; 0%?Mo?0.4%; 0%?Nb?0.1%; 0%?V?0.1%; 0%?B?0.05%; 0%?Sn?0.1%; 0%?Pb?0.1%; 0%?Sb?0.1%; 0.001%?Ca?0.01%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel including, by area percentage, at least 95% of martensite, a cumulated amount of ferrite and bainite between 1% and 5%, and an optional amount of residual austenite between 0% and 2%.