Arcelormittal

Sollac

Arcelormittal France

Institut De Recherches De La Siderurgie Francaise

Université De Nantes

Didier Huin

Astrid Perlade

Jean-Michel Mataigne

Kangying Zhu

Florence Bertrand

Hubert Saint-Raymond

Paul-Victor Riboud

Christian Moretto

Céline Musik

Renaud Frappier

Francedillaois Stouvenot

Hubert Saint Raymond

Ronan Jacolot

Daniele Corsello

Celine Musik

A method for determining the temperature of a metal strip () inside a cooling apparatus () of a hot rolling installation is implemented by an electronic device (). This method includes acquiring a temperature measure of a strip portion at a current time instant; estimating, at the current time instant, a heat flux extracted from the strip portion inside the cooling apparatus according to a thermal model, and computing a strip portion temperature at a next time instant from the acquired temperature measure and the estimated extracted heat flux. The thermal model models an air cooling of the strip portion, a coolant header cooling of the strip portion by a coolant header and a remaining coolant cooling of the strip portion, wherein for the coolant header cooling the model models both an impingement cooling of the strip portion and a parallel flow cooling of the strip portion.

Method and electronic device for determining the temperature of a metal strip, related control method, computer program, control apparatus and hot rolling installation

The invention deals with a process for manufacturing a hot-dip galvanized or galvannealed steel sheet having a TRIP microstructure, said process comprising the steps consisting in: -providing a steel sheet whose composition comprises, by weight: 0.01&#x2266;C&#x2266;0.22%, 0.50&#x2266;Mn&#x2266;2.0%, 0.2&#x2266;Si&#x2266;2.0%, 0.005&#x2266;Al&#x2266;2.0%, Mo&#x3c;1.0%, Cr&#x2266;1.0%, P&#x3c;0.02%, Ti&#x2266;0.20%, V&#x2266;0.40%, Ni&#x2266;1.0%, Nb&#x2266;0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, -oxidizing said steel sheet in a direct flame furnace where the atmosphere comprises air and fuel with an air-to-fuel ratio between 0.80 and 0.95, so that a layer of iron oxide having a thickness from 0.05 to 0.2 &#x3bc;m is formed on the surface of the steel sheet, and an internal oxide of Si and/or Mn and/or Al is formed, -reducing said oxidized steel sheet, at a reduction rate from 0.001 to 0.010 &#x3bc;m/s, in order to achieve a reduction of the layer of iron oxide, -hot-dip galvanising said reduced steel sheet to form a zinc-coated steel sheet, and -optionally, subjecting said hot-dip coated steel sheet to an alloying treatment to form a galvannealed steel sheet.

Process for manufacturing a galvanized or a galvannealed steel sheet by DFF regulation

The invention relates to a metallurgical reactor for the treatment under reduced pressure of a liquid metal (1) such as steel, contained in a ladle (2), of the type comprising a chamber (25), connected to a gas-suction plant (30) which can maintain a reduced pressure therein, and two tubular snorkels (26, 27), the upper ends of which emerge in orifices (35, 36) made in the bottom (28) of the chamber (25) and the lower ends of which may be immersed in said liquid metal (1) contained in said ladle (2), one (26) of said snorkels, called the 'ascending snorkel', having means (29) for injecting a gas into its internal space for the purpose of creating a circulatory motion in the liquid metal (1) between the ladle (2) and the chamber (25) during said treatment, the reactor also comprising an enclosure (17) which is provided with means (20) for injecting a gas into its internal space, these means being suitable for creating a pressure greater than atmospheric pressure in the enclosure (17), and the ladle (2) being placed in the latter, the upper edge (23) of said enclosure being designed to support the bottom (28) of the chamber (25) in a sealed manner during said treatment, and means (18, 19) for raising the ladle (2) toward the chamber (25) during said treatment.

Metallurgical reactor for the treatment under reduced pressure of a

Process for the continuous casting of a fine metal wire, in which a jet of liquid metal is quenched and solidified in a layer of cooling liquid deposited on a surface in motion. The dispersal of the turbulence of the cooling liquid is accelerated upstream of the point of impact of the jet of metal on the liquid. The apparatus for carrying out the process comprises a grating arranged across the layer of cooling liquid between the outlet of the pipe feeding the cooling liquid onto the surface in motion and the point of penetration of the jet of metal into the cooling liquid.

Process and apparatus for the continuous casting of fine metal wire

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Nancy, France

Didier Huin