COLD ROLLED AND HEAT TREATED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

• Main Authors: PIPARD Jean-marc, ARLAZAROV Artem
• Format: Patent
• Language: English; Spanish
• Published: 13.08.2020
• Subjects: 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; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Una hoja de acero laminada en frío y tratada térmicamente que tiene una composición que comprende los siguientes elementos, expresada en porcentaje en peso 0.10% = de carbono = 0.5%, 1% = de manganeso = 3.4%, 0.5% = de silicio = 2.5%, 0.03% = de aluminio = 1.5%, azufre = 0.003%, 0.002% = de fósforo = 0.02%, nitrógeno = 0.01% y puede contener uno o más de los siguientes elementos opcionales 0.05% = de cromo = 1%, 0.001% = de molibdeno = 0.5%, 0.001% = de niobio = 0.1%, 0.001% = de titanio = 0.1%, 0.01% = de cobre = 2%, 0.01% = de níquel = 3%, 0.0001% = de calcio = 0.005%, de vanadio = 0.1%, boro = 0.003%, cerio= 0.1%, magnesio = 0.010%, circonio = 0.010% la composición restante está compuesta de hierro y las impurezas inevitables causadas por el procesamiento, y una microestructura de dicha hoja de acero laminada comprende por fracción de área, 10 a 30% de austenita residual, 5 a 50% de bainita recocida, 10 a 40% de bainita, 1% a 20% de martensita templada, y menos del 30% de martensita revenida donde la presencia combinada de bainita y austenita residual será del 30% o más. A cold rolled and heat treated steel sheet having a composition with the following elements, expressed in percentage by weight 0.10%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, Nitrogen≤0.01% 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%, Vanadium≤0.1%, Boron≤0.003%, Ceriums≤0.1%, Magnesiums≤0.010%, Zirconiums≤0.010% the remainder composition being composed of iron and the unavoidable impurities caused by processing, and a microstructure of the said rolled steel sheet having by area fraction, 10 to 30% Residual Austenite, 5 to 50% Annealed Bainite, 10 to 40% of Bainite, 1% to 20% Quenched Martensite, and less than 30% Tempered Martensite where the combined presence of Bainite and Residual Austenite shall be 30% or more.