METHOD FOR PRODUCING A ULTRA HIGH STRENGTH COATED STEEL SHEET AND OBTAINED SHEET

A method for producing a cold rolled steel sheet having a tensile strength ≥ 1470 MPa and a total elongation TE ≥ 19%, the method comprising the steps of annealing at an annealing temperature AT ≥ Ac3 a non-treated steel sheet whose chemical composition contains in weight %: 0.34 % ≤ C ≤ 0.40 %, 1.5...

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Bibliographische Detailangaben
Hauptverfasser:	GIRINA, Olga A, PANAHI, Damon
Format:	Patent
Sprache:	eng ; hun
Schlagworte:	ALLOYS APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES 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 PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS 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 method for producing a cold rolled steel sheet having a tensile strength ≥ 1470 MPa and a total elongation TE ≥ 19%, the method comprising the steps of annealing at an annealing temperature AT ≥ Ac3 a non-treated steel sheet whose chemical composition contains in weight %: 0.34 % ≤ C ≤ 0.40 %, 1.50 % ≤ Mn ≤ 2.30 %, 1.50 ≤ Si ≤ 2.40%, 0 % < Cr ≤ 0.7%, 0 % ≤ Mo ≤ 0.3 %, 0.01 % ≤ Al ≤ 0.07 %, the remainder being Fe and unavoidable impurities, quenching the annealed steel sheet by cooling it to a quenching temperature QT < Ms transformation point and between 150 °C and 250 °C, and making a partitioning treatment by reheating the quenched steel sheet to a partitioning temperature PT between 350°C and 420°C and maintaining the steel sheet at this temperature during a partitioning time Pt between 15 seconds and 250 seconds.