Luxembourg, Luxembourg
Luxembourg, Luxembourg

ArcelorMittal S.A. is a multinational steel manufacturing corporation headquartered in Avenue de la Liberté, Luxembourg. It was formed in 2006 from the takeover and merger of Arcelor by Mittal Steel. ArcelorMittal is the world's largest steel producer, with an annual crude steel production of 93.6 million tones as of 2012. It is ranked 91st in the 2013 Fortune Global 500 ranking of the world's biggest corporations. Wikipedia.

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Patent
ArcelorMittal | Date: 2017-05-17

The invention relates mainly to a sheet of hot-rolled steel with an elastic limit of more than 680 MPa at least in the direction across the rolling direction, and no higher than 840 MPa, with strength of 780 MPa and 950 MPa, elongation at break higher than 10% and hole expansion ratio (Ac) no lower than 45%, in which the chemical composition consists of, the contents being expressed as weight percentages: 0.04% C 0.08%, 1.2% Mn 1.9%, 0.1 % Si 0.3%, 0.07% Ti 0.125%, 0.05% Mo 0.35%, 0.15% Cr 0.6% when 0.05% Mo 0.11% or 0.10% Cr 0.6% when 0.11 % Mo 0.35%, Nb 0.045%, 0.005% Al 0.1 %, 0.002% N 0.01 %, S 0.004%, P 0.020%, and optionally 0.001% V 0.2%, the remainder consisting of iron and inevitable impurities from the production process, in which the microstructure consists of granular bainite having a surface percentage higher than 70%, and ferrite having a surface percentage lower than 20%, the possible complement consisting of lower bainite, martensite and residual austenite, the sum of the contents of martensite and residual austenite being lower than 5%. The invention also relates to the method for manufacturing such a sheet.


A method for producing a high strength coated steel sheet having a yield stress YS > 800 MPa, a tensile strength TS > 1180 MPa, and improved formability and ductility. The steel contains: 15% C 0.25%, 1.2% Si 1.8%, 2% Mn 2.4%, 0.1% Cr 0.25%, Al 0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature higher than Ac3 and lower than 1000C for a time of more than 30 s, then quenched by cooling it to a quenching temperature QT between 250C and 350C, to obtain a structure consisting of at least 60 % of martensite and a sufficient austenite content such that the final structure contains 3 % to 15% of residual austenite and 85 % to 97% of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 430C and 480C and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated and cooled to the room temperature. Obtained coated sheet.


A method for manufacturing a high-strength sheet having improved formability and ductility accord which the chemical composition of the steel contains, in percent by weight: 0.25% 3 transformation point of the steel, quenching the sheet by cooling it down to a quenching temperature QT between Ms - 65C and Ms -115C, being in order to obtain a final structure containing at least 65 % of martensite and at least 5% of residual austenite, the sum of the ferrite and bainite contents being less than 10%, Ms being the Ms transformation point of the steel according to the Andrews formula, heating the sheet up to an overaging temperature PT between 360C and 500C and maintaining it at said temperature for a time Pt between 10 s and 600 s, and cooling the sheet down to the ambient temperature.


A method for producing a high strength steel sheet having a yield strength YS of at least 850 MPa, a tensile strength TS of at least 1180 MPa, a total elongation of at least 14% and a hole expansion ratio HER of at least 30%. The chemical composition of the steel contains: 0.15% C 0.25%, 1.2% Si 1.8%, 2% Mn 2.4%, 0.1% Cr 0.25%, Nb 0.05 %, Ti 0.05 %, Al 0.50%, the remainder being Fe and unavoidable impurities. The sheet is annealed at an annealing temperature TA higher than Ac3 but less than 1000C for more than 30 s, by cooling it to a quenching temperature QT between 275C and 325C, at a cooling speed sufficient to have, just after quenching, a structure consisting of austenite and at least 50% of martensite, the austenite content being such that the final structure can contain between 3% and 15% of residual austenite and between 85 and 97% of the sum of martensite and bainite, without ferrite, heated to a partitioning temperature PT between 420C and 470C and maintained at this temperature for time between 50 s and 150 s and cooled to the room temperature.


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 % (FR)Linvention concerne un procd de production dune tle dacier lamine froid prsentant une rsistance la traction 1 470 MPa et un allongement total TE 19 %, le procd comprenant les tapes consistant recuire une temprature de recuit AT Ac3 une tle dacier non traite dont la composition chimique contient, en % en poids : 0,34 % C 0,40 %, 1,50 % Mn 2,30 %, 1,50 Si 2,40 %, 0 % < Cr 0,5 %, 0 % < Mo 0,3 %, 0,01 % Al 0,07 %, le reste tant du Fe et des impurets invitables ; tremper la tle dacier recuite en la refroidissant une temprature de trempe QT < point de transformation Ms et comprise entre 150 C et 250 C ; et raliser un traitement de sparation par rchauffement de la tle dacier trempe une temprature de sparation PT comprise entre 350 C et 420 C et maintenir la tle dacier cette temprature pendant un temps de sparation Pt compris entre 15 secondes et 120 secondes.


A method for producing a high strength steel sheet having a yield strength YS > 850 MPa, a tensile strength TS >1180 MPa, a total elongation > 13 % and a hole expansion ratio HER > 30%, by heat treating a steel sheet wherein the chemical composition of the steel contains: 0.13% C 0.22%, 1.2% Si 1.8%, 1.8% Mn 2.2%, 0.10% Mo 0.20%, Nb 0.05 %, Ti 865C and 30C/s in order to have, just after quenching, a structure consisting of austenite and at least 50% of martensite, the austenite content being such that the final structure can contain between 3% and 15% of residual austenite and between 85 % and 97% of the sum of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 370C and 470C and maintained at this temperature for a time Pt between 50 s and 150 s, then cooled to the room temperature


Patent
ArcelorMittal | Date: 2017-05-10

The invention relates to a panel equipped with a photovoltaic device made up of an even number of columns of photovoltaic modules, the columns being aligned substantially parallel to a longitudinal edge of the panel, each column comprising an electrical pole at each of its ends, the polarity of an electrical pole of one end being the inverse of that of the electrical pole of the other end, the poles of two adjacent columns being of inverted polarity, the electrical pole taking the form of a male connector when it is of one polarity and the form of a female connector when it is of inverse polarity and the male and female connectors being arranged so that they fit into one another when the lower transverse edge of an upper panel covers the upper transverse edge of a lower panel. The invention also relates to an array of panels according to the invention, to an electrical device able to be connected to a converter comprising an array according to the invention and to an electrical connection method, to a converter, and to the constituent panels of an array according to the invention.


A method for manufacturing a plate, a band, or a coil of hot-rolled steel is provided. The method includes providing an ingot or a slab of steel with a desired composition and a microstructure composed of austenite and 35 to 65% ferrite by volume and hot rolling the ingot or slab at a temperature between 1150 and 1280 C. to obtain a plate, a band or a coil. A method for manufacturing a hot-rolled bar or wire of steel, a steel profile and a forged steel piece are also provided.


The invention relates to a double-annealed steel sheet, the composition of which comprises, the contents being expressed as weight percentage, 0.20% C 0.40%, 0.8% Mn 1.4%, 1.60% Si 3.00%, 0.015% Nb 0.150%, Al 0.1%, Cr 1.0%, S 0.006%, P 0.030%, Ti 0.05%, V 0.05%, B 0.003%, N 0.01%, the rest of the composition consisting of iron and unavoidable impurities resulting from the production, the microstructure consisting, in surface area proportions, of 10% to 30% of residual austenite, of 30% to 60% of annealed martensite, of 5% to 30% of bainite, of 10% to 30% of fresh martensite and of less than 10% of ferrite. It also relates to the method for manufacturing same and also to the use of such a sheet.


A method for manufacturing a high-strength sheet having improved formability segregation accord which the chemical composition of the steel contains, in percent by weight: 0.1 %C0.4% 4.2% Mn 8.0% 1 %Si3% 0.2% Mo 0.5% the remainder being Fe and unavoidable impurities, the method comprising the steps of annealing a rolled sheet made of said steel by soaking it at an annealing temperature AT higher than the Ac3 transformation point of the steel, quenching the sheet by cooling it down to a quenching temperature QT between the Ms and Mf transformation points in order to obtain a final structure containing at least 65% of martensite and at least 20% of residual austenite, the sum of the ferrite and bainite contents being less than 10%, heating the sheet up to an overaging temperature PT between 300C and 500C and maintaining it at said temperature for a time Pt greater than 10s and cooling the sheet down to the ambient temperature. Sheet obtained.

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