Danieli & C. Officine Meccaniche S.p.a.

Other

Centro Sviluppo Materiali S.p.a.

Milorad Pavlicevic

Alfredo Poloni

Gianni Gensini

Angelico Della Negra

Nuredin Kapaj

Peter Tishchenko

Giampietro Benedetti

Fabio Vecchiet

Andrea Codutti

Anatoly Kolesnichenko

Alessandra Primavera

Stefano Morsut

Matteo Vittorio Losciale

Fabio Guastini

Romano Sellan

Alejandro Sanz Lara

Andrea De Luca

Gianpietro Benedetti

Alessandro Martinis

Marco Schreiber

Gianluca Bazzaro

Alessandro Dulcetti

Stefano Luperi

Nicoletta Zacchetti

Luca Lattanzi

Simone Guanin

Peter Tischenko

Ljuban Milic

Simone Barcherini

Cristina Bassi

Mirco Marchiori

Anastasia Kolesnichenko

Manlio Zorzut

Victoria Buryak

A hot-rolling plant () for the production of metal strips comprising a roughing stand (), a reheating furnace () or a maintenance tunnel for maintaining the temperature of the product, a pre-finishing mill train (), comprising three or four stands, a finishing mill train (), comprising two or three stands, for finishing the product, in which the work rolls of one stand are provided with their own motor drive, independent one from each other, so as to allow the peripheral speeds of both of said work rolls to be autonomously varied under rolling load.

Rolling plant

A continuous annealing and pickling process of flat cold-rolled products, such as stainless steel strips, to obtain a high surface quality product at high production rates and with a low environmental impact. It comprises the following steps: heating, up to a temperature comprised in the range 650-1050&#xb0; C., in an atmosphere with an oxygen content comprised in the range from 0.5 to 12%; heating for a time comprised from 10 to 200 sec up to a temperature comprised in the range from 650 to 1200&#xb0; C. in presence of oxidizing agents and/or inert agents; cooling down to temperatures comprised in the range from 650&#xb0; C. to ambient temperature in presence of oxidizing agents and/or inert agents; thermochemical or electrolytic descaling and finally possible pickling and/or passivation, by means of the use of pickling baths consisting of mineral acid solutions.

Annealing and pickling process

An apparatus and process for the dry removal of the scale from the surface of a metal product comprising at least one heating area that does not reduce the specific surface of the material to be treated and does not cause oxidation, at least one reducing area for performing the reaction between a specific reducing gas (normally hydrogen) and at least the scale, at least one cooling area for cooling the metal product, means for heating the metal product, means for heating the reducing gas, means for controlling the fluid dynamics of the boundary layer produced by the flow of said reducing gas over the surface of the metal product, means for removing the reaction products front the reducing gas after the reaction, means for cooling the metal product, and means for removing the reaction products from the treated surface of the metal product.

Apparatus and process for the dry removal of the scale found on the surface of the metal products

An apparatus and process for the dry removal of the scale from the surface of a metal product comprising at least one heating area that does not reduce the specific surface of the material to be treated and does not cause oxidation, at least one reducing area for performing the reaction between a specific reducing gas (normally hydrogen) and at least the scale, at least one cooling area for cooling the metal product, means for heating the metal product, means for heating the reducing gas, means for controlling the fluid dynamics of the boundary layer produced by the flow of said reducing gas over the surface of the metal product, means for removing the reaction products from the reducing gas after the reaction, means for cooling the metal product, and means for removing the reaction products from the treated surface of the metal product.

Apparatus and process for the dry removal of the scale found on the surface of metal products

The following invention relates to an injector-burner for applications in the metalwork field, in particular for use in electric arc furnace melting processes having a frontal head with two series of holes arranged in two concentric crowns, the inner crown of holes used to feed fuel and the outer crown used to supply a supporter of combustion. A central hole is also provided, which is fitted with an oxygen injection nozzle. The holes of the two crowns are divided into groups separated by circular sectors without holes, in order to create a number of flames and are inclined in such a way as to give the gases supplied, and consequentially the flame generated, a rotation around the injector-burner axis. By regulating the flow-rates of the fuel and the supporter of combustion supplied to the various holes, the injector-burner is able to regulate the flame shape in burner mode and also in injection mode, thus guaranteeing optimum performance in all modes.

Injector-burner for metal melting furnaces

An arrangement and conformation of the discharge openings and channels of a continuous-casting nozzle, together with a specific external profile of the body of the nozzle itself, enable slabs of any thickness, in particular from medium to thin ones, to be cast, which have excellent surface quality and are practically free from inclusions and blowholes.

Nozzle for continuous casting

Burner () comprising a head () with two groups of holes (&#x2033;) for the passage of fuel and comburent arranged in circles concentric to the burner axis, in which the various groups () of holes are separated by circular sectors without holes and the axes of the holes are oblique compared with the burner axis (X) to create special forms of flame.

Burner

Device to take in fumes and cool the roof ( ) of electric furnaces. The device has a central aperture ( ) into which an electrode can be inserted and a peripheral aperture ( ) to take in and discharge the fumes. The device also has a first cooling system ( ) for a central zone surrounding, and cooperating with, the central aperture ( ), and a second system ( ) to take in and convey the fumes. The first cooling system ( ) includes a circular cyclone chamber ( ) having a plurality of turns ( ) able to cool the zone surrounding the central aperture ( ).

Device to take in fumes and cool the roof of electric furnaces

Device and corresponding method for the continuous casting of molten materials, comprising a vertical duct having the shape of a funnel made of refractory material for receiving molten material, and a second duct where the molten material is cooled off, the two ducts being set one on top of the other and being axially aligned. The molten material is injected into the channel, around a stretch of which electromagnetic means are set for generating magnetic forces on the molten material, the said means consisting of a plurality of windings of electrically conductive material and of a ferromagnetic core and may be electrically supplied to produce a magnetic flux along the direction of the channel, thus producing a set of forces acting on the molten material which are directed orthogonally with respect to the direction of the said magnetic flux so as to maintain detachment of the outer surface of the molten material from the walls of the channel.

Method and device for continuous casting of molten materials

Device for the direct reduction of iron oxides of the type with a gravitational load, comprising a reactor defining, in its upper part, at least a zone inside which the reduction reaction occurs, means ( ) to introduce the load through a mouth ( ) of the reactor, means ( ) to introduce a current of gas into at least one section of the reactor in correspondence with the reduction zone, outlet means ( ) of the reduced material from the bottom of the reactor, and means ( ) to discharge the exhaust fumes, said reactor ( ) including at least a first upper zone ( ) of heating, pre-reduction and final reduction, with a taper diverging downwards, and a second lower zone ( ) of carburization and cooling, with a taper converging downwards.

Device for the direct reduction of iron oxides

Continuous casting device and method with rollers for plane products such as strip ( ) or sheet, comprising counter-rotating rollers ( ) immersed in a receptacle ( ) containing molten metal ( ), said receptacle ( ) including a bottom ( ) and side walls ( ), said rollers ( ) being arranged parallel and adjacent to define a transit gap ( ) through which the strip ( ) to be produced is extracted, the device comprising holding elements ( ) of the electromagnetic type arranged in cooperation with each of the ends of said rollers ( ), said holding elements ( ) having an inner edge, an outer edge and a curved shape suitable to surround, without contact, at least partly the surface of said rollers ( ) immersed in said molten metal ( ), said holding elements ( ) comprising at least a coil ( ) suitable to be passed through by an alternating current to generate a magnetic field in said molten metal ( ) and generating currents induced therein in order to obtain the lateral confinement of said molten metal ( ) in the space (&ldquo;1&rdquo;) between the relative facing inner edges of said holding elements ( ).

Continuous casting method with rollers and relative device

Crystalliser for continuous casting of billets and blooms, including a monolithic tubular structure whose transverse section defines the section shape of the cast product, said tubular structure including a wall defined by an outer face and an inner face located in contact with the cast metal, said crystalliser including holes for the transit of cooling liquid, made in the thickness of the wall of the monolithic tubular structure, said holes being made on said wall in such a manner that the distance (&ldquo;d&rdquo;) between their longitudinal axis and the inner face of the wall of the crystalliser is between 5 and 20 mm.

Crystalliser for continuous casting

Gravitational type furnace for the direct reduction of mineral iron comprising a median reaction zone ( ) in which the reactions to reduce the mineral iron occur, means ( ) to feed the mineral iron to said reaction zone ( ), distribution means ( ) to introduce reducing gas into said reaction zone ( ), discharge means ( ) to discharge the reduced metal iron, and an intake device ( ) for the reducing gas, said intake device ( ) being positioned in correspondence with a chamber ( ) situated above said reaction zone ( ), a toroidal grid ( ) being arranged in said chamber ( ).

Furnace for the direct reduction of iron oxides

A cooled roof for electric arc furnaces (,) or ladle furnaces (,). The roof being used as a covering element and including a cooling system comprising tubes fed with cooling fluid. The roof including at least a central aperture (,) for the positioning and movement of the electrodes (,) and at least a peripheral aperture (,) for the aspiration and discharge of fumes. The aperture (,) being connected to intake systems. The roof including two single-block cooling structures, inner (,) and outer (,), consisting of respective bent tubes (,) developing according to adjacent and superimposed rings or spirals. The inner (,) and outer (,) cooling structures being associated with one another at least in correspondence with the respective bases facing towards the inside of the furnace (,). Between the inner cooling structure (,) and the outer cooling structure (,) there being defined an annular interspace (,) in which the fumes circulate in an annular direction and slow down. The annular interspace (,) communicating with the peripheral aperture. The inner cooling structure (,) including fume-transit interstices connecting the inside of the furnace (,) with the annular interspace (,).

Cooled roof for electric arc furnaces and ladle furnaces

Device and relative method to inject technological gases and solid material in powder form, in a furnace used in steel and metallurgical melting processes, comprising an emission element including an outlet mouth arranged at a certain distance from the liquid bath, said emission element being innerly shaped as a double nozzle, respectively first and second, the first nozzle having a convergent/divergent conformation defined by a neck and being predisposed for the emission of a jet of gas at supersonic speed, said second nozzle having at the end a conformation convergent towards the axis of the emission element and being pre-disposed, according to the step of the melting process in progress, for the emission of a jet at subsonic speed either of technological gases alone, such as for example oxygen, or of solid material in powder form on a gassy vehicle, or of liquid in atomized form.

Integrated device to inject oxygen, technological gases and solid material in powder form and method to use the integrated device for the metallurgical processing of baths of molten metal

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Udine, Italy

Milorad Pavlicevic