High strength steel sheet having excellent formability and a method of manufacturing the steel sheet

A cold rolled and heat treated steel sheet is provided. The steel sheet includes a composition including 0.17%≤carbon≤0.24%, 1.9%≤manganese≤2.2%, 0.5%≤aluminum≤1.2%, 0.5%≤silicon≤1%, Si+Al≥1.3%, 0.05%≤chromium≤0.2%, 0.015%≤niobium≤0.03%, sulphur≤0.003%, phosphorus≤0.03% and optionally 0.005%≤titaniu...

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Bibliographische Detailangaben
Hauptverfasser:	Uta, Elena, Hebert, Veronique
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A cold rolled and heat treated steel sheet is provided. The steel sheet includes a composition including 0.17%≤carbon≤0.24%, 1.9%≤manganese≤2.2%, 0.5%≤aluminum≤1.2%, 0.5%≤silicon≤1%, Si+Al≥1.3%, 0.05%≤chromium≤0.2%, 0.015%≤niobium≤0.03%, sulphur≤0.003%, phosphorus≤0.03% and optionally 0.005%≤titanium≤0.05%, 0.001%≤molybdenum≤0.05%, a remainder of the composition including iron and the unavoidable impurities. A microstructure of the coated steel sheet includes, in area fraction, 10 to 20% residual austenite, said austenite phase having a carbon content between 0.9 to 1.1%, 40 to 55% polygonal ferrite, 15 to 40% granular bainite and at least 5% tempered martensite, a sum of tempered martensite and residual austenite being between 20 to 30%. A method is also provided.