ArcelorMittal

A method for manufacturing pig iron in a smelting furnace including a vessel, the method including the following successive steps: loading DRI product in the vessel melting the DRI product to form a pig iron layer topped by a slag layer and injecting a desulphurizing reagent directly in the pig iron layer. It also deals with the manufacturing of steel from the-pig iron and the associated electrical smelting furnace.

A method for the manufacture of a self-standing graphene oxide or reduced graphene oxide film having a thickness between 0.4 and 4.0 μm, including the successive steps of A) preparing an aqueous dispersion including 0.1 to 30 g·L −1 of graphene oxide or reduced graphene oxide, B) depositing the aqueous dispersion on a flat substrate coated with a polymeric film dissolvable in organic solvents and unsolvable in water, so as to form a wet film having a thickness comprised between 1 μm and 3.5 mm, C) drying the wet film, D) separating the polymeric film from the flat substrate, E) placing the polymeric film in a support frame, F) showering the polymeric film with an organic solvent to dissolve the polymeric film, G) separating the graphene oxide or reduced graphene oxide film from the frame to obtain the self-standing graphene oxide or reduced graphene oxide film.

A steel sheet coated with an aluminum-based coating and a second zinc coating having a thickness less than or equal to 1.1 μm is provided. A method for preparing the coated steel sheet, a method for preparing a press-hardened part from the steel sheet, a press-hardened part, and the use of the press-hardened part are also provided.

Side structure ( 1 ) for a motor vehicle ( 3 ) including an inner and outer frame ( 11, 13 ) each forming a closed ring and having two openings corresponding to the front and rear doors ( 8, 10 ), wherein the inner and outer frames ( 11, 13 ) are each formed by hot stamping respectively an inner and an outer frame blank ( 111, 113 ), the outer frame blank being a single tailor welded blank made of steel and wherein the inner and outer frames ( 11,13 ) are assembled to form a hollow volume ( 7 ) between them.

A method for manufacturing a hot-rolled and coated steel sheet having a thickness between 1.8 mm and 5 mm. The method contains the steps of: providing a semi-product having a composition containing: 0.04%≤C≤0.38%, 0.40%≤Mn≤3%, 0.005%≤Si≤0.70%, 0.005%≤Al≤0.1%, 0.001%≤Cr≤2%, 0.001%≤Ni≤2%, 0.001%≤Ti≤0.2%, Nb≤0.1%, B≤0.010%, 0.0005%≤N≤0.010%, 0.0001%≤S≤0.05%, 0.0001%≤P≤0.1%, Mo≤0.65%, W≤0.30%, Ca≤0.006%, hot-rolling with a final rolling temperature FRT, to obtain a hot-rolled steel product having a thickness between 1.8 mm and 5 mm, then cooling down to a coiling temperature T coil satisfying: 450° C.≤T coil ≤T coilmax with T coilmax=650−140×fγ , T coilmax being expressed in degrees Celsius and fγ designating the austenite fraction just before the coiling, and coiling to obtain a hot-rolled steel substrate, pickling and coating the hot-rolled steel substrate with Al or an Al alloy by continuous hot-dipping in a bath, to obtain a hot-rolled and coated steel sheet containing a hot-rolled steel sheet and an Al or an Al alloy coating, having a thickness between 10 and 33 μm, on each side of the hot-rolled steel sheet.

A low density hot rolled steel including of 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure including of ferrite from 60% to 80%, 10% to 35% kappa carbides (Fe,Mn) 3 AIC x , where x is lower than or equal to 1 and austenite from 0% to 10% wherein the microstructure grains having less than 4 GPa nano-hardness must be more than 45% and microstructure grains having nano-hardness of more than 5 GPa must be less than 10%.

A method for producing a welded metal blank ( 16 ) includes cutting a first initial metal sheet ( 1 ) and a second initial metal sheet ( 3 ) from a first and second metal strip ( 4 ); joining the first and second initial metal sheets ( 1,3 ) by welding so as to obtain an initial welded metal blank ( 9 ), the initial welded metal blank ( 9 ) comprising a weld joint ( 10 ) joining the first and the second initial metal sheets ( 1,3 ); and cutting said initial welded metal blank ( 9 ) by a process involving metal melting so as to obtain at least one final welded metal blank ( 16 ) comprising a first metal blank portion ( 17 ) and a second metal blank portion ( 18 ) joined by a weld joint portion ( 19 ) consisting of a portion of the weld joint ( 10 ) obtained during the joining step.

A process of manufacturing a silicon-graphene-graphite composite for a Silicon-based anode of a lithium-ion battery, including bringing together silicon particles with a particle size distribution D 10 above 100 nm and an exfoliatable graphene-based material in a first organic solvent, the weight ratio of silicon to exfoliatable graphene-based material being between 1.5 and 9, mixing at at least 500 rpm for at least 20 min so as to mill the silicon particles into nanoparticles, exfoliate at least a part of the exfoliatable graphene-based material into graphene and form a silicon-graphene composite, bringing together the silicon-graphene composite and graphite, the weight ratio of carbon to silicon being between 1.5 and 19 and the viscosity being between 0.025 and 160 Pa·s at 1 s −1 shear rate, and mixing for at least 2 min so as to form a silicon-graphene-graphite composite.

A cold rolled and heat treated steel sheet including of the following elements 0.2%≤C≤0.35%; 0.2%≤Mn≤1.2%; 0.1%≤Si≤0.9%; 0%≤Al≤0.1%; 0.2%≤Cr≤0.8%; 0.01%≤Nb≤0.1%; 0.1%≤Ni≤0.9%; 0.1%≤Mo≤0.9% 0.01%≤Ti≤0.1%; 0%≤P≤0.02%; 0%≤S≤0.03%; 0%≤N≤0.09%; 0.0001%≤B≤0.010%; 0%≤V≤0.1%; 0%≤Cu≤2%; 0%≤Ca≤0.005%; 0%≤Ce≤0.1%; 0%≤Mg≤0.05%; 0%≤Zr≤0.05%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel including, by area percentage, at least 75% of tempered martensite, 0% to 10% Fresh Martensite, 3 to 20% of Ferrite and 0 to 5% Bainite.

A double cold rolled non-oriented electrical steel sheet having a composition including, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.2%≤Manganese≤0.24%, 3.1%≤Silicon≤3.5%, 0.8%≤Aluminum≤1.1%, Phosphorus ≤0.15%, Sulfur ≤0.006%, Nitrogen ≤0.09%, and various optional elements. The remainder composition being iron and unavoidable impurities caused by processing. The microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less from 30% to 35% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000 A/m (J50) from 1.645 T to 1.660 T.