EP1330322B1 - Method and device for continuous casting of liquid steel - Google Patents

Method and device for continuous casting of liquid steel Download PDF

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Publication number
EP1330322B1
EP1330322B1 EP01971525A EP01971525A EP1330322B1 EP 1330322 B1 EP1330322 B1 EP 1330322B1 EP 01971525 A EP01971525 A EP 01971525A EP 01971525 A EP01971525 A EP 01971525A EP 1330322 B1 EP1330322 B1 EP 1330322B1
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EP
European Patent Office
Prior art keywords
dome
steel
nozzle
zone
liquid
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EP01971525A
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German (de)
French (fr)
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EP1330322A1 (en
Inventor
Paul Naveau
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/112—Treating the molten metal by accelerated cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • the present invention relates to a new device for casting steel continuously, to obtain a final product of mixed chemical composition, namely comprising on the one hand the base steel, and on the other hand, base steel combined with elements added during casting.
  • the invention also relates to the method implemented by the device.
  • the technique of continuous casting of steel is well known. It consists essentially to feed with molten steel from a tundish or tundish basket, a cooled mold of copper or copper alloy, called continuous casting mold, this last being open at its lower end, and to extract from this opening a continuous ingot partially solidified.
  • the molten steel is introduced into the mold by means of at least one nozzle, that is to say a generally tubular element disposed between the basket distributor and the mold.
  • the lower end of the nozzle- is provided usually one or two outlets located in the axis of the nozzle or laterally, and opens under the upper level of liquid steel present in the mold.
  • nozzles for obtaining better cooling of the superheated liquid steel from the tundish.
  • the goal is to get pasty steel at the inlet of the mold.
  • These nozzles may in particular have a heat exchanger consisting of a copper tube cooled with water or a deflector or dome. Its role is to force overheated steel to trickle into a thin layer along the walls of the nozzle, which significantly increases the heat exchange surface. This technique is called hollow jet casting.
  • an injection of inert gas is often performed at the level of the entry of the molten steel into the nozzle in order to prevent oxidation of the steel and prevent accidental clogging, particularly by alumina formation.
  • the technique of casting in a hollow jet makes it possible in particular to reduce the risk of clogging of the gas supply, in relation to the case where the inlet port thereof is directly in contact with the liquid steel introduced into the nozzle.
  • injecting the inert gas, such as argon for example into the hollow jet.
  • This material is by example an alloy metal or a ceramic. The purpose is to obtain, as the case may be, a metal alloy or composite.
  • the two-component term means products whose chemical composition of steel is different depending on the location of the investigated product, eg different skin by report to the heart.
  • the present invention aims at providing a device and an associated method of casting steel for the production of products with a mixed chemical not having the disadvantages of the state of the art.
  • the invention proposes a new method allowing the use of a existing continuous casting installation, with only one specific nozzle.
  • the present invention relates to a continuous casting nozzle intended for the flow of steel from a tundish into an ingot mold; said nozzle mainly comprising, if described in a vertical position and considered in the direction of progression of the steel wound up and down, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having at least one exit port; said conduit comprising in its upper part a distribution member disposed substantially at the inlet of said vertical duct and comprising a dome for deflecting the metal entering the nozzle; said nozzle also comprising injection means of gaseous, liquid or solid material finely divided under said dome in a zone internal: characterized in that the dome of said distributor is provided with means allowing the separation of the liquid steel in two jets, which penetrate separately in the mold.
  • the dome of said distributor member has at least four passages that are interconnected so as to split the flow of steel into merging into two separate jets, flowing respectively via a so-called internal zone and a said outer zone to the mold.
  • the outer zone opens to the mold by means of at least two lateral openings and the inner zone opens to the mold by means of at least one first orifice.
  • the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the inner zone and flows into the mold via the or the first orifices.
  • the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the outer zone and flows into the mold via the lateral openings.
  • a preferred embodiment of the invention relates to a nozzle for to the flow of steel from a tundish in an ingot mold.
  • the nozzle mainly includes, if described in a vertical position and considered in the direction of progression of the liquid steel from top to bottom, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having a first output port.
  • duct has in its upper part a distribution member, arranged substantially at the entrance of said vertical duct and comprising a dome allowing deflect the metal entering the nozzle, as well as a vertical wall ending the dome downwardly and extending to the lower base of said conduit, said vertical wall having at least two lateral outlets, the distribution member dividing the vertical conduit in two physically separated zones, a so-called internal zone and a so-called external zone.
  • the nozzle also comprises material injection means gaseous, liquid or solid finely divided under said dome in the so-called internal zone.
  • the nozzle is characterized in that the dome of said distributor member is provided with means for separating the liquid steel in two streams, a jet flowing in the so-called internal zone and penetrating into the ingot mold by said first orifice and a jet flowing in the so-called external zone and penetrating into the ingot mold through the orifices side.
  • the vertical duct is of cylindrical shape, circular section or oval.
  • the liquid metal constituting the jet in which is operated a Injection under the dome consists of a mixture of base steel and injected material under the dome.
  • the chemical composition of the metal obtained after an injection under the dome is different from the chemical composition of the base steel.
  • the finely divided solid material injected under the dome is in suspension in a non-oxidizing gas.
  • the finely divided solid material injected under the dome presents a particle size less than 2000 ⁇ m.
  • the particle size of said finely divided is between 100 and 300 ⁇ m.
  • the two jets are of different rates.
  • the flow of liquid metal poured for the products dishes is between 1.5 and 6 tons per minute.
  • the flow is between 0.3 and 0.5 ton per minute.
  • the vertical duct is provided with means for regulating the temperature of the liquid metal flowing via said duct.
  • the means for regulating the temperature of the liquid metal flowing in the part situated before the distribution element comprising the dome are distinct from the means regulating the temperature of the liquid metal flowing in the part situated after the said dome.
  • the nozzle of the invention is part of a continuous casting installation of steel, preferably in the form of long or flat products, comprising a basket distributor with an outlet and a flow control device, and a mold.
  • the nozzle then allows the casting of a steel of mixed composition in the mold from the molten base steel of the tundish.
  • FIG. 1 shows a casting device according to a particular embodiment of the invention, mounted between a continuous casting mold 1 and a ladle or a basket casting distributor 2 having an outlet duct 3.
  • the outlet duct 3 is equipped with a flow regulator, such as a stopper 4 or a sliding drawer nozzle 5, having essentially the shape of a cylinder, possibly of section oval, attached to the tundish, is mounted on the mold 1.
  • the nozzle 5 can be for example provided with a copper heat exchanger, provided with a water cooling.
  • the upper base of the cylinder is in contact with the conduit 3. This base is provided with an orifice corresponding to the lower orifice of the duct.
  • the nozzle 5 comprises at its bottom three communication ports allowing the passing from the steel to the mold: two side openings 8 and a hearing 9 located in the lower base of the duct 5.
  • a dome-shaped distributor member 6 At the upper end of the nozzle 5 is arranged a dome-shaped distributor member 6 whose upper surface is slightly sloped; preferably greater than 10 ° with respect to the horizontal.
  • the dome 6 is fixed by means not shown in the conduit 5.
  • An injection device 7 is located so as to introduce under the dome 6, a gas, a liquid or solid particles finely divided or powdered, possibly using in the latter case a non oxidant as a vector.
  • the dome 6 has a side wall 10, preferably vertical and cylindrical, extending to the bottom of the nozzle 5. This side wall allows to isolate a so-called inner portion 11 of the conduit 5 of another so-called external 12 of the same conduit 5.
  • FIG. 2 schematically shows in plan a mode of realization.
  • a distribution dome 6 comprising four passages for the molten metal, communicating two by two.
  • the four passages are each associated with a opening in the dome 6.
  • Two openings 13 are delimited by cutting the dome between the latter and the inner wall of the nozzle 5.
  • the two other openings 14 are for example practiced more centrally on the surface of the dome 6, and communicate under this surface by a common collection pipe 11, itself opening towards downstream of the nozzle.
  • the dome 6 makes it possible to separate the jet of metal A coming from tundish 2 through the duct 3 in two separate jets, of importance substantially equal, physically separated from each other: a first jet of metal B flowing in the center 11 of the nozzle 5 and a second jet of metal C flowing in the space 12, possibly along the inner side wall of the duct 5 ( Figure 1).
  • the injection device 7 makes it possible to introduce into the metal jet B a constituent addition, such as alloy metal, gas or ceramic, and to modify the composition relative to the base metal.
  • the metal B flows from the nozzle 5 into the central portion of the mold 1, by the hearing 9.
  • the metal C flows from the nozzle 5 by 8. By solidifying, the metal C will be distributed on the walls of the mold while the metal B, of modified chemical composition, is rather at heart in the solidified mass.
  • the material injected by the device 7 under the dome 6 may be in the gas phase, liquid or solid. In the latter case, the material is in powder form or finely divided particles. The size of the particles injected is less than 2 mm, and most often between 100 and 300 microns.
  • the process according to the invention can be used both in the continuous casting of flat products, such as slabs, than in long products, such as round, squares, threads, etc.
  • the variation of chemical composition obtained on the section of the product can be preserved during direct rolling.
  • Such steels are therefore perfectly suitable for galvanizing, for example in that the outer layer is of modified composition relative to the core of the product and promotes easy attachment of the zinc coating layer, in particular by reducing in skin of silicon concentration.
  • the steel may contain copper (CORTEN steel) continuously in order to avoid problems of surface corrosion. We can avoid the use of stainless steel, which is very expensive.
  • the flow rates of steel in the mold meet the standard industrial standards in the iron and steel industry. In particular, for flat products, the flow rate is between 1.5 and 6 tons / min and for long products between 0.3 and 0.5 tons / min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention concerns a nozzle mainly consisting, when viewed in vertical position and in a forward movement of the liquid steel from the top downwards, of a vertical conduit ( 5 ) comprising in its upper part a distributing member, arranged substantially at the intake of said conduit and including a dome ( 6 ) for deflecting the metal penetrating into the nozzle, which is also provided with means for injecting a gaseous, liquid or solid finely divided material beneath said dome ( 6 ) into an inner zone ( 11 ). The dome ( 6 ) of said distributing member is provided with means for separating liquid steel into two jets (B, C), one jet (B) flowing into the inner zone ( 11 ) and penetrating into the ingot mould ( 1 ) through a first orifice ( 9 ) at the lower base of said conduit ( 5 ) and the other jet (C) flowing into an outer zone ( 12 ) and penetrating into the ingot mould ( 1 ) through lateral orifices ( 8 ) located in the vertical wall of said conduit ( 5 ).

Description

Objet de l'inventionObject of the invention

La présente invention se rapporte à un nouveau dispositif de coulée de l'acier en continu, permettant d'obtenir un produit final de composition chimique mixte, à savoir comportant d'une part l'acier de base, et d'autre part, l'acier de base allié à des éléments ajoutés lors de la coulée.
L'invention se rapporte également au procédé mis en oeuvre par le dispositif.The present invention relates to a new device for casting steel continuously, to obtain a final product of mixed chemical composition, namely comprising on the one hand the base steel, and on the other hand, base steel combined with elements added during casting.
The invention also relates to the method implemented by the device.

Etat de la techniqueState of the art

La technique de coulée continue d'acier est bien connue. Elle consiste essentiellement à alimenter avec de l'acier en fusion provenant d'un panier répartiteur ou tundish, un moule refroidi en cuivre ou alliage de cuivre, appelé lingotière de coulée continue, cette dernière étant ouverte à son extrémité inférieure, et à en extraire par cette ouverture un lingot continu partiellement solidifié.The technique of continuous casting of steel is well known. It consists essentially to feed with molten steel from a tundish or tundish basket, a cooled mold of copper or copper alloy, called continuous casting mold, this last being open at its lower end, and to extract from this opening a continuous ingot partially solidified.

En général; l'acier en fusion est introduit dans la lingotière au moyen d'au moins une busette, c'est-à-dire un élément généralement tubulaire disposé entre le panier répartiteur et la lingotière. L'extrémité inférieure de la busette- est pourvue habituellement d'un ou deux orifices de sortie sis dans l'axe de la busette ou latéralement, et débouche sous le niveau supérieur d'acier liquide présent dans la lingotière.In general; the molten steel is introduced into the mold by means of at least one nozzle, that is to say a generally tubular element disposed between the basket distributor and the mold. The lower end of the nozzle- is provided usually one or two outlets located in the axis of the nozzle or laterally, and opens under the upper level of liquid steel present in the mold.

On connaít également des busettes destinées à obtenir un meilleur refroidissement de l'acier liquide surchauffé en provenance du panier répartiteur. Le but est d'obtenir de l'acier pâteux à l'entrée de la lingotière. Ces busettes peuvent présenter notamment un échangeur de chaleur constitué d'un tube en cuivre refroidi à eau ou encore un déflecteur ou dôme. Celui-ci a pour rôle de forcer l'acier surchauffé à ruisseler en une couche mince le long des parois de la busette, ce qui permet d'augmenter notablement la surface d'échange thermique. Cette technique porte le nom de coulée en jet creux.Also known are nozzles for obtaining better cooling of the superheated liquid steel from the tundish. The goal is to get pasty steel at the inlet of the mold. These nozzles may in particular have a heat exchanger consisting of a copper tube cooled with water or a deflector or dome. Its role is to force overheated steel to trickle into a thin layer along the walls of the nozzle, which significantly increases the heat exchange surface. This technique is called hollow jet casting.

En outre, on effectue souvent une injection de gaz inerte, tel que l'argon, au niveau de l'entrée de l'acier en fusion dans la busette en vue d'éviter l'oxydation de l'acier et de prévenir le bouchage accidentel, notamment par formation d'alumine. La technique de coulée en jet creux permet notamment de réduire le risque de bouchage de l'alimentation en gaz, par rapport au cas où l'orifice d'admission de celui-ci est directement en contact avec l'acier liquide introduit dans la busette. Ainsi, il est connu d'injecter le gaz inerte, tel que l'argon par exemple, à l'intérieur du jet creux. On peut également injecter dans le jet creux une certaine quantité de matière finement divisée, en utilisant comme vecteur un gaz non oxydant en légère surpression par rapport à la pression atmosphérique, afin d'empêcher toute entrée d'air. Cette matière est par exemple un métal d'alliage ou une céramique. Le but est d'obtenir, selon le cas, un alliage métallique ou un composite.In addition, an injection of inert gas, such as argon, is often performed at the level of the entry of the molten steel into the nozzle in order to prevent oxidation of the steel and prevent accidental clogging, particularly by alumina formation. The technique of casting in a hollow jet makes it possible in particular to reduce the risk of clogging of the gas supply, in relation to the case where the inlet port thereof is directly in contact with the liquid steel introduced into the nozzle. So, it is known injecting the inert gas, such as argon for example, into the hollow jet. We can also inject into the hollow jet a certain quantity of finely divided material, using as vector a non-oxidizing gas in slight overpressure compared to the atmospheric pressure, to prevent any entry of air. This material is by example an alloy metal or a ceramic. The purpose is to obtain, as the case may be, a metal alloy or composite.

Actuellement, la coulée continue de produits à base d'acier de composition chimique mixte ou bi-composants suscite un très grand intérêt dans un très grand nombre d'applications spécifiques, aussi bien pour les produits longs que les produits plats. Le terme bi-composants désigne des produits dont la composition chimique de l'acier est différente selon l'endroit du produit investigué, par exemple différente en peau par rapport au coeur.Currently, continuous casting of chemical-based steel products mixed or bi-component is of great interest in a very large number of specific applications, for both long and flat products. The two-component term means products whose chemical composition of steel is different depending on the location of the investigated product, eg different skin by report to the heart.

En particulier, une telle technique est susceptible d'être utilisée par exemple :

  • pour augmenter la qualité du traitement de surface des produits. Dans le cas de la galvanisation par exemple, il est souhaitable de réduire la teneur en silicium à proximité de la surface des brames, afin d'améliorer l'aptitude à la galvanisation des produits laminés ;
  • pour améliorer la coulabilité, par exemple dans le cas des aciers péritectiques, dont le contenu en carbone est de l'ordre de 0,1 - 0,15 %, particulièrement difficiles à couler, où on souhaite modifier la teneur en carbone, à proximité de la surface ;
  • pour couler des produits dont les propriétés mécaniques varient le long de leur épaisseur, comme par exemple une haute résistance de surface et une grande ductilité à coeur.
In particular, such a technique is likely to be used for example:
  • to increase the quality of surface treatment of products. In the case of galvanizing, for example, it is desirable to reduce the silicon content near the surface of the slabs in order to improve the galvanizing ability of the rolled products;
  • to improve the flowability, for example in the case of peritectic steels, whose carbon content is of the order of 0.1 - 0.15%, particularly difficult to sink, where it is desired to modify the carbon content, in the vicinity from the surface;
  • for casting products whose mechanical properties vary along their thickness, such as a high surface resistance and high ductility to the core.

Dans le domaine de la fonderie proprement dite, on connaít des procédés permettant de réaliser des pièces métalliques, en particulier en acier, à composition chimique mixte, telles que cylindres de laminoir, pièces d'usure, etc.In the field of foundry itself, processes are known to to produce metal parts, in particular of steel, with chemical composition mixed, such as rolling mill rolls, wearing parts, etc.

Il n'existe cependant pas, dans l'état de la technique, de dispositif simple permettant de réaliser en coulée continue des aciers à composition mixte. On connaít l'utilisation d'au moins deux répartiteurs en parallèle, chacun étant muni d'une busette propre et intervenant simultanément pour couler dans la même lingotière, des aciers de composition mixte. Toutefois, une telle installation s'avère industriellement très compliquée et donc très coûteuse. Une autre possibilité a été imaginée, pour l'obtention d'un acier bi-composants, à savoir l'introduction d'une tôle métallique dans le lingot en cours de coulée, ce qui s'avère encore une fois très peu pratique.However, in the state of the art, there is no simple device for perform continuous casting steels mixed composition. We know the use of minus two splitters in parallel, each having a clean nozzle and intervening simultaneously to sink in the same mold, steels of mixed composition. However, such an installation proves to be industrially very complicated and therefore very expensive. Another possibility has been imagined, for obtaining a two-component steel, namely the introduction of a metal sheet into ingot during casting, which again proves very impractical.

Buts de l'inventionGoals of the invention

La présente invention vise à fournir un dispositif et un procédé associé de coulée continue d'acier pour l'obtention de produits à composition chimique mixte, ne présentant pas les inconvénients de l'état de la technique.The present invention aims at providing a device and an associated method of casting steel for the production of products with a mixed chemical not having the disadvantages of the state of the art.

En particulier, l'invention propose un nouveau procédé permettant l'utilisation d'une installation existante de coulée continue, comportant une seule busette spécifique.In particular, the invention proposes a new method allowing the use of a existing continuous casting installation, with only one specific nozzle.

Principaux éléments caractéristiques de l'inventionMain characteristic elements of the invention

La présente invention se rapporte à une busette de coulée continue, destinée à l'écoulement d'acier à partir d'un panier répartiteur dans une lingotière ; ladite busette comprenant principalement, si elle est décrite en position verticale et considérée dans le sens de progression de l'acier liquidé de haut en bas, un conduit vertical, terminé par une base supérieure présentant un orifice d'entrée de l'acier liquide à partir du panier répartiteur et une base inférieure présentant au moins un orifice de sortie ; ledit conduit comprenant dans sa partie supérieure un organe répartiteur disposé sensiblement à l'entrée dudit conduit vertical et comprenant un dôme permettant de dévier le métal entrant dans la busette ; ladite busette comprenant également des moyens d'injection de matière gazeuse, liquide ou solide finement divisée sous ledit dôme dans une zone interne : caractérisée en ce que le dôme dudit organe répartiteur est pourvu de moyens permettant la séparation de l'acier liquide en deux jets, lesquels pénètrent séparément dans la lingotière.The present invention relates to a continuous casting nozzle intended for the flow of steel from a tundish into an ingot mold; said nozzle mainly comprising, if described in a vertical position and considered in the direction of progression of the steel wound up and down, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having at least one exit port; said conduit comprising in its upper part a distribution member disposed substantially at the inlet of said vertical duct and comprising a dome for deflecting the metal entering the nozzle; said nozzle also comprising injection means of gaseous, liquid or solid material finely divided under said dome in a zone internal: characterized in that the dome of said distributor is provided with means allowing the separation of the liquid steel in two jets, which penetrate separately in the mold.

Avantageusement, le dôme dudit organe répartiteur présente au moins quatre passages qui sont interconnectés de manière à fractionner l'écoulement de l'acier en fusion en deux jets séparés, s'écoulant respectivement via une zone dite interne et une zone dite externe vers la lingotière.Advantageously, the dome of said distributor member has at least four passages that are interconnected so as to split the flow of steel into merging into two separate jets, flowing respectively via a so-called internal zone and a said outer zone to the mold.

De préférence, la zone externe débouche vers la lingotière au moyen d'au moins deux orifices latéraux et la zone interne débouche vers la lingotière au moyen d'au moins un premier orifice. Preferably, the outer zone opens to the mold by means of at least two lateral openings and the inner zone opens to the mold by means of at least one first orifice.

Selon une première forme d'exécution de l'invention, le métal liquide passant sous le dôme dans la zone où l'on effectue des injections de matière gazeuse, liquide ou solide finement divisée est canalisé dans la zone interne et s'écoule dans la lingotière via le ou les premiers orifices.According to a first embodiment of the invention, the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the inner zone and flows into the mold via the or the first orifices.

Selon une deuxième forme d'exécution de l'invention, le métal liquide passant sous le dôme dans la zone où l'on effectue des injections de matière gazeuse, liquide ou solide finement divisée est canalisé dans la zone externe et s'écoule dans la lingotière via les orifices latéraux.According to a second embodiment of the invention, the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the outer zone and flows into the mold via the lateral openings.

Une modalité de réalisation préférentielle de l'invention concerne une busette, destinée à l'écoulement d'acier à partir d'un panier répartiteur dans une lingotière. La busette comprend principalement, si elle est décrite en position verticale et considérée dans le sens de progression de l'acier liquide de haut en bas, un conduit vertical, terminé par une base supérieure présentant un orifice d'entrée de l'acier liquide à partir du panier répartiteur et une base inférieure présentant un premier orifice de sortie. De plus, le conduit présente dans sa partie supérieure un organe répartiteur, disposé sensiblement à l'entrée dudit conduit vertical et comprenant un dôme permettant de dévier le métal entrant dans la busette, ainsi qu'une paroi verticale terminant le dôme vers le bas et s'étendant jusqu'à la base inférieure dudit conduit, ladite paroi verticale présentant au moins deux orifices de sortie latéraux, l'organe répartiteur divisant le conduit vertical en deux zones physiquement séparées, une zone dite interne et une zone dite externe. La busette comprend également des moyens d'injection de matière gazeuse, liquide ou solide finement divisée sous ledit dôme dans la zone dite interne. La busette est caractérisée par le fait que le dôme dudit organe répartiteur est pourvu de moyens permettant la séparation de l'acier liquide en deux jets, un jet s'écoulant dans la zone dite interne et pénétrant dans la lingotière par ledit premier orifice et un jet s'écoulant dans la zone dite externe et pénétrant dans la lingotière par les orifices latéraux.A preferred embodiment of the invention relates to a nozzle for to the flow of steel from a tundish in an ingot mold. The nozzle mainly includes, if described in a vertical position and considered in the direction of progression of the liquid steel from top to bottom, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having a first output port. In addition, duct has in its upper part a distribution member, arranged substantially at the entrance of said vertical duct and comprising a dome allowing deflect the metal entering the nozzle, as well as a vertical wall ending the dome downwardly and extending to the lower base of said conduit, said vertical wall having at least two lateral outlets, the distribution member dividing the vertical conduit in two physically separated zones, a so-called internal zone and a so-called external zone. The nozzle also comprises material injection means gaseous, liquid or solid finely divided under said dome in the so-called internal zone. The nozzle is characterized in that the dome of said distributor member is provided with means for separating the liquid steel in two streams, a jet flowing in the so-called internal zone and penetrating into the ingot mold by said first orifice and a jet flowing in the so-called external zone and penetrating into the ingot mold through the orifices side.

Préférentiellement, le conduit vertical est de forme cylindrique, à section circulaire ou ovale.Preferably, the vertical duct is of cylindrical shape, circular section or oval.

Toujours selon l'invention, le métal liquide constituant le jet dans lequel est opéré une injection sous le dôme consiste en un mélange d'acier de base et de matière injectée sous le dôme. En outre, la composition chimique du métal obtenu après avoir opéré une injection sous le dôme est différente de la composition chimique de l'acier de base.Still according to the invention, the liquid metal constituting the jet in which is operated a Injection under the dome consists of a mixture of base steel and injected material under the dome. In addition, the chemical composition of the metal obtained after an injection under the dome is different from the chemical composition of the base steel.

Avantageusement, la matière solide finement divisée injectée sous le dôme est en suspension dans un gaz non oxydant.Advantageously, the finely divided solid material injected under the dome is in suspension in a non-oxidizing gas.

Avantageusement, la matière solide finement divisée injectée sous le dôme présente une granulométrie inférieure à 2000 µm.Advantageously, the finely divided solid material injected under the dome presents a particle size less than 2000 μm.

De manière particulièrement avantageuse, la granulométrie de ladite matière finement divisée est comprise entre 100 et 300 µm.Particularly advantageously, the particle size of said finely divided is between 100 and 300 μm.

Suivant une modalité de réalisation particulière, les deux jets sont de débits différents.According to a particular embodiment, the two jets are of different rates.

Conformément à la présente invention, le débit de métal liquide coulé pour les produits plats est compris entre 1,5 et 6 tonnes par minute. Pour les produits longs, le débit est compris entre 0,3 et 0,5 tonne par minute.According to the present invention, the flow of liquid metal poured for the products dishes is between 1.5 and 6 tons per minute. For long products, the flow is between 0.3 and 0.5 ton per minute.

Avantageusement, le conduit vertical est doté de moyens pour réguler la température du métal liquide s'écoulant via ledit conduit. Toutefois, selon l'invention,
les moyens régulateurs de la température du métal liquide s'écoulant dans la partie située avant l'élément répartiteur comprenant le dôme sont distincts des moyens régulateurs de la température du métal liquide s'écoulant dans la partie située après le dôme précité.Advantageously, the vertical duct is provided with means for regulating the temperature of the liquid metal flowing via said duct. However, according to the invention,
the means for regulating the temperature of the liquid metal flowing in the part situated before the distribution element comprising the dome are distinct from the means regulating the temperature of the liquid metal flowing in the part situated after the said dome.

En service, la busette de l'invention fait partie d'une installation de coulée continue d'acier, de préférence sous forme de produits longs ou plats, comprenant un panier répartiteur muni d'un orifice de sortie et d'un dispositif régulateur de débit, et une lingotière. La busette permet alors la coulée d'un acier de composition mixte dans la lingotière à partir de l'acier de base en fusion du panier répartiteur.In use, the nozzle of the invention is part of a continuous casting installation of steel, preferably in the form of long or flat products, comprising a basket distributor with an outlet and a flow control device, and a mold. The nozzle then allows the casting of a steel of mixed composition in the mold from the molten base steel of the tundish.

Un autre aspect de la présente invention concerne un nouveau procédé de coulée continue d'acier, de préférence sous forme de produits plats ou longs, comprenant les étapes suivantes :

  • coulée d'un acier de base en fusion d'un panier répartiteur par un orifice de sortie muni d'un organe régulateur de débit dans une busette comportant un organe répartiteur présentant un dôme et une paroi verticale séparant la busette en une zone interne et une zone externe ;
  • séparation de l'acier de base dans l'organe répartiteur en un jet interne et un jet externe ;
  • injection de matière gazeuse, liquide ou solide finement divisée sous ledit dôme dans la zone interne et mélange de ladite matière à l'acier de base pour former un acier de composition chimique différente de l'acier de base ;
  • écoulement du jet d'acier de base par des ouïes latérales de la busette et solidification dudit jet le long des parois de la lingotière ;
  • écoulement du jet d'acier de composition chimique différente par une ouïe inférieure de la busette et solidification dudit jet à coeur dans la lingotière.
Another aspect of the present invention relates to a novel continuous steel casting process, preferably in the form of flat or long products, comprising the following steps:
  • casting a molten base steel of a tundish through an outlet port provided with a flow control member in a nozzle having a tundish having a dome and a vertical wall separating the nozzle in an inner zone and a external area;
  • separating the base steel in the distributor member into an inner jet and an outer jet;
  • injecting finely divided gaseous, liquid or solid material under said dome into the inner zone and mixing said material with the base steel to form a steel of different chemical composition from the base steel;
  • pouring the base steel jet through lateral openings of the nozzle and solidifying said jet along the walls of the mold;
  • flow of the steel jet of different chemical composition by a lower hearing of the nozzle and solidification of said jet core in the mold.

La présente invention présente les avantages suivants par rapport à l'état de la technique :

  • obtention en coulée continue d'un acier à composition chimique mixte, en utilisant une seule busette compatible avec l'installation de coulée ;
  • simplification par rapport à une installation compliquée, et donc fort coûteuse, mais théoriquement réalisable industriellement, comportant au moins deux busettes et/ou deux paniers répartiteurs ;
  • faisabilité de la coulée en continu d'une gamme de produits sidérurgiques ou métallurgiques, dits à haute valeur ajoutée, tels que les produits revêtus (galvanisés, plastifiés, etc.).
The present invention has the following advantages over the state of the art:
  • obtaining in continuous casting a steel with a mixed chemical composition, using a single nozzle compatible with the casting installation;
  • simplification compared to a complicated installation, and therefore very expensive, but theoretically feasible industrially, comprising at least two nozzles and / or two distribution baskets;
  • feasibility of continuous casting of a range of high value-added steel or metallurgical products, such as coated products (galvanized, plasticized, etc.).

Brève description des figuresBrief description of the figures

  • La figure 1 représente schématiquement, par une vue en élévation, une installation de coulée continue d'acier, utilisant une busette selon la présente invention.FIG. 1 schematically represents, in elevation view, an installation of continuous casting of steel, using a nozzle according to the present invention.
  • La figure 2 représente schématiquement, par une vue en plan, un répartiteur de coulée incorporé dans une busette selon la présente invention.FIG. 2 diagrammatically shows, in plan view, a tundish incorporated in a nozzle according to the present invention.

    • Description d'une forme d'exécution préférée de l'inventionDescription of a preferred embodiment of the invention

    La figure 1 montre un dispositif de coulée selon une modalité particulière de l'invention, monté entre une lingotière de coulée continue 1 et une poche de coulée ou un panier répartiteur de coulée 2 comportant un conduit de sortie 3. Le conduit de sortie 3 est muni d'un régulateur de débit, telle qu'une quenouille 4 ou un tiroir coulissant Une busette 5, ayant essentiellement la forme d'un cylindre, éventuellement de section ovale, fixée au panier répartiteur, est montée sur la lingotière 1. La busette 5 peut être par exemple pourvue d'un échangeur de chaleur en cuivre, muni d'un système de refroidissement à eau. La base supérieure du cylindre est en contact avec le conduit 3. Cette base est pourvu d'un orifice correspondant à l'orifice inférieur du conduit. La busette 5 comporte à sa partie inférieure trois ouïes de communication permettant le passage de l'acier vers la lingotière : deux ouïes latérales 8 et une ouïe 9 située dans la base inférieure du conduit 5. A l'extrémité supérieure de la busette 5 est disposé un organe répartiteur en forme de dôme 6, dont la surface supérieure est en légère pente; de préférence supérieure à 10° par rapport à l'horizontale. Le dôme 6 est fixé par des moyens non représentés au conduit 5. Un dispositif d'injection 7 est situé de manière à introduire sous le dôme 6, un gaz, un liquide ou des particules solides finement divisées ou en poudre, en utilisant éventuellement dans ce dernier cas un gaz non oxydant comme vecteur. Le dôme 6 comporte une paroi latérale 10, de préférence verticale et cylindrique, s'étendant jusqu'au fond de la busette 5. Cette paroi latérale permet d'isoler une partie dite intérieure 11 du conduit 5 d'une autre partie dite extérieure 12 du même conduit 5.FIG. 1 shows a casting device according to a particular embodiment of the invention, mounted between a continuous casting mold 1 and a ladle or a basket casting distributor 2 having an outlet duct 3. The outlet duct 3 is equipped with a flow regulator, such as a stopper 4 or a sliding drawer nozzle 5, having essentially the shape of a cylinder, possibly of section oval, attached to the tundish, is mounted on the mold 1. The nozzle 5 can be for example provided with a copper heat exchanger, provided with a water cooling. The upper base of the cylinder is in contact with the conduit 3. This base is provided with an orifice corresponding to the lower orifice of the duct. The nozzle 5 comprises at its bottom three communication ports allowing the passing from the steel to the mold: two side openings 8 and a hearing 9 located in the lower base of the duct 5. At the upper end of the nozzle 5 is arranged a dome-shaped distributor member 6 whose upper surface is slightly sloped; preferably greater than 10 ° with respect to the horizontal. The dome 6 is fixed by means not shown in the conduit 5. An injection device 7 is located so as to introduce under the dome 6, a gas, a liquid or solid particles finely divided or powdered, possibly using in the latter case a non oxidant as a vector. The dome 6 has a side wall 10, preferably vertical and cylindrical, extending to the bottom of the nozzle 5. This side wall allows to isolate a so-called inner portion 11 of the conduit 5 of another so-called external 12 of the same conduit 5.

    La figure 2 représente en plan de façon très schématique une modalité de réalisation d'un dôme répartiteur 6 comprenant quatre passages pour le métal en fusion, communiquant deux à deux. Les quatre passages sont associés chacun à une ouverture dans le dôme 6. Deux ouvertures 13 sont délimitées par découpe du dôme entre celui-ci et la paroi intérieure de la busette 5. Les deux autres ouvertures 14 sont par exemple pratiquées plus au centre à la surface du dôme 6, et communiquent sous cette surface par une tubulure de collecte commune 11, elle-même débouchant vers l'aval de la busette. Ainsi le dôme 6 permet de séparer le jet de métal A venant du panier répartiteur 2 à travers le conduit 3 en deux jets distincts, d'importance sensiblement égale, séparés physiquement l'un de l'autre : un premier jet de métal B qui s'écoule au centre 11 de la busette 5 et un deuxième jet de métal C qui s'écoule dans l'espace 12, éventuellement le long de la paroi latérale intérieure du conduit 5 (Figure 1).FIG. 2 schematically shows in plan a mode of realization. a distribution dome 6 comprising four passages for the molten metal, communicating two by two. The four passages are each associated with a opening in the dome 6. Two openings 13 are delimited by cutting the dome between the latter and the inner wall of the nozzle 5. The two other openings 14 are for example practiced more centrally on the surface of the dome 6, and communicate under this surface by a common collection pipe 11, itself opening towards downstream of the nozzle. Thus, the dome 6 makes it possible to separate the jet of metal A coming from tundish 2 through the duct 3 in two separate jets, of importance substantially equal, physically separated from each other: a first jet of metal B flowing in the center 11 of the nozzle 5 and a second jet of metal C flowing in the space 12, possibly along the inner side wall of the duct 5 (Figure 1).

    Le dispositif d'injection 7 permet d'introduire dans le jet de métal B un constituant additionnel tel que métal d'alliage, gaz ou céramique et d'en modifier ainsi la composition par rapport au métal de base. Le métal B s'écoule de la busette 5 dans la partie centrale de la lingotière 1, par l'ouïe 9. Le métal C s'écoule de la busette 5 par les ouïes latérales 8. En se solidifiant, le métal C va se trouver réparti sur les parois de la lingotière alors que le métal B, de composition chimique modifiée, se trouvera plutôt à coeur dans la masse solidifiée.The injection device 7 makes it possible to introduce into the metal jet B a constituent addition, such as alloy metal, gas or ceramic, and to modify the composition relative to the base metal. The metal B flows from the nozzle 5 into the central portion of the mold 1, by the hearing 9. The metal C flows from the nozzle 5 by 8. By solidifying, the metal C will be distributed on the walls of the mold while the metal B, of modified chemical composition, is rather at heart in the solidified mass.

    La matière injectée par le dispositif 7 sous le dôme 6 peut être en phase gazeuse, liquide ou solide. Dans ce dernier cas, la matière se présente sous forme de poudre ou de particules finement divisées. La taille des particules injectées est inférieure à 2 mm, et le plus souvent comprise entre 100 et 300 µm.The material injected by the device 7 under the dome 6 may be in the gas phase, liquid or solid. In the latter case, the material is in powder form or finely divided particles. The size of the particles injected is less than 2 mm, and most often between 100 and 300 microns.

    Le procédé selon l'invention peut être utilisé aussi bien dans la coulée continue de produits plats, tels que brames, que dans celle de produits longs, tels que ronds, carrés, fils, etc.The process according to the invention can be used both in the continuous casting of flat products, such as slabs, than in long products, such as round, squares, threads, etc.

    En particulier, dans le cas des produits plats, la variation de composition chimique obtenue sur la section du produit peut être conservée lors du laminage direct. De tels aciers sont dès lors parfaitement aptes à la galvanisation, par exemple de par le fait que la couche extérieure est de composition modifiée par rapport au coeur du produit et favorise un accrochage aisé de la couche de revêtement en zinc, notamment de par la diminution en peau de la concentration en silicium. Dans le cas des produits longs, l'acier peut par exemple contenir du cuivre (acier CORTEN), de manière continue, afin d'éviter les problèmes de corrosion de surface. On peut ainsi éviter le recours à l'acier inoxydable, qui coûte très cher.
    Dans le procédé selon l'invention, les débits d'acier dans la lingotière répondent aux normes industrielles standard en sidérurgie. En particulier, pour les produits plats, le débit est compris entre 1,5 et 6 tonnes / min et pour les produits longs, entre 0,3 et 0,5 tonnes / min.    In particular, in the case of flat products, the variation of chemical composition obtained on the section of the product can be preserved during direct rolling. Such steels are therefore perfectly suitable for galvanizing, for example in that the outer layer is of modified composition relative to the core of the product and promotes easy attachment of the zinc coating layer, in particular by reducing in skin of silicon concentration. In the case of long products, for example, the steel may contain copper (CORTEN steel) continuously in order to avoid problems of surface corrosion. We can avoid the use of stainless steel, which is very expensive.
    In the process according to the invention, the flow rates of steel in the mold meet the standard industrial standards in the iron and steel industry. In particular, for flat products, the flow rate is between 1.5 and 6 tons / min and for long products between 0.3 and 0.5 tons / min.

    Claims (19)

    1. A continuous casting nozzle (5) for the flow of steel (A) from a tundish (2) into a mould (1) ; said nozzle mainly comprising, if described in a vertical position and considered in the flow direction of the liquid steel from top to bottom, a vertical runner (5) ending in an upper base with an intake aperture for the liquid steel (A) from the tundish (2) and a lower base with at least one outlet aperture; said runner(5) comprising in its upper part a distribution element placed approximately at the inlet of said vertical runner (5) and comprising a dome (6) allowing the metal (A) entering the nozzle to be redirected; said nozzle also comprising a means for injecting gaseous, liquid or finely divided solid material under said dome (6) into an inner zone (11); characterised in that the dome (6) of said distribution element is provided with a means for separating the liquid steel into two streams (B, C) which separately enter the mould (1).
    2. Nozzle according to Claim 1, characterised in that the dome (6) of said distribution element has at least four channels and in that said channels are interconnected so as to split the flow of the molten steel (A) into two separate streams (B, C) flowing through an "inner" zone (11) and an "outer" zone (12) towards the mould (1), respectively.
    3. Nozzle according to Claim 1 or 2, characterised in that the outer zone (12) opens into the mould (1) by means of at least two side apertures (8) and in that the inner zone (11) opens into the mould by means of at least one aperture (9).
    4. Nozzle according to Claim 2 or 3, characterised in that the liquid metal passing under the dome in the zone where gaseous, liquid or finely divided solid material is injected, is channelled into the inner zone (11) and cast into the mould (1) through the aperture (s) (9).
    5. Nozzle according to Claim 2 or 3, characterised in that the liquid metal passing under the dome in the zone
      where gaseous, liquid or finely divided solid material is injected, is channelled into the outer zone (12) and cast into the mould (1) through the apertures (8).
    6. Nozzle according to any one of Claims 1 to 5, for the flow of steel (A) from a tundish (2) into a mould (1) ; said nozzle mainly comprising, if described in a vertical position and considered in the flow direction of the liquid steel from top to bottom, a vertical runner (5) ending in an upper base with an intake aperture for the liquid steel (A) from the tundish (2) and a lower base with a first outlet aperture (9); said runner (5) comprising in its upper part a distribution element placed approximately at the inlet of said vertical runner (5) and comprising a dome (6) allowing the metal (A) entering the nozzle to be redirected, as well as a vertical wall (10) terminating the dome (6) downwards and extending as far as the lower base of said runner (5), said vertical wall (5) having at least two side outlet apertures (8), the distribution element dividing the vertical runner (5) into two physically separated zones, an "inner" zone (11) and an "outer" zone (12); said nozzle also comprising a means for injecting gaseous, liquid or finely divided solid material under said dome (6) into the inner zone (11); characterised in that the dome (6) of said distribution element is provided with a means for separating the liquid steel into two streams (B, C), one stream (B) flowing into the "inner" zone (11) and entering the mould (1) by said first aperture (9) and one stream flowing into the "outer" zone (12) and entering the mould (1) by the side apertures (8).
    7. Nozzle according to any one of the preceding claims, characterised in that the vertical runner (5) is cylindrical in shape with a circular or oval cross-section.
    8. Nozzle according to any one of Claims 1 to 7, characterised in that the liquid metal forming the stream into which material is injected under the dome (6) consists of a mixture of basic steel and of material injected under the dome (6).
    9. Nozzle according to any one of Claims 1 to 7, characterised in that the chemical composition of the metal obtained after injecting material under the dome (6) is different from the chemical composition of the basic steel (A).
    10. Nozzle according to any one of the preceding claims, characterised in that said finely divided solid material injected under the dome (6) is in suspension in a non-oxidising gas.
    11. Nozzle according to any one of the preceding claims, characterised in that said finely divided solid material injected under the dome (6) has a particle size smaller than 2,000 µm.
    12. Nozzle according to Claim 11, characterised in that the particle size of said finely divided material is between 100 and 300 µm.
    13. Nozzle according to any one of the preceding claims, characterised in that the two streams (B, C) have different flow rates.
    14. Nozzle according to any one of Claims 1 to 13, characterised in that.the flow rate of the liquid metal cast for flat products is between 1.5 and 6 tonnes per minute.
    15. Nozzle according to any one of Claims 1 to 13, characterised in that the flow rate of the liquid metal cast for long products is between 0.3 and 0.5 tonnes per minute.
    16. Nozzle according to any one of the preceding claims, characterised in that the vertical runner (5) is provided with a means for regulating the temperature of the liquid metal (A) flowing through said runner.
    17. Nozzle according to Claim 16, characterised in that the means for regulating the temperature of the liquid metal flowing through the part located before the distribution element including the dome (6) are not the same as the means for regulating the temperature of the liquid metal flowing through the part located after said dome (6).
    18. Installation for the continuous casting of steel, preferably in the form of long or flat products, comprising a tundish with an outlet aperture and a flow-regulating element, a mould and a nozzle according to any one of Claims 1 to 17, said nozzle allowing the casting of a steel with a mixed composition into the mould from the basic molten steel from the tundish.
    19. Method for the continuous casting of steel, preferably in the form of flat or long products, comprising the following stages:
      casting a molten basic steel from a tundish through an outlet aperture provided with a flow-regulating element into a nozzle comprising a distribution element with a dome and a vertical wall separating the nozzle into an inner zone and an outer zone;
      separating the basic steel in the distribution element into an inner stream and an outer stream;
      injecting gaseous, liquid or finely divided solid material under said dome into the inner zone and mixing said material with the basic steel, in order to form a steel with a different chemical composition from the basic steel;
      flow of the stream of basic steel through the side openings of the nozzle and solidification of said stream along the walls of the mould;
      flow of the stream of steel with a different chemical composition through a lower opening of the nozzle and solidification of said stream in the middle of the mould.
    EP01971525A 2000-10-10 2001-09-18 Method and device for continuous casting of liquid steel Expired - Lifetime EP1330322B1 (en)

    Applications Claiming Priority (3)

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    BE2000/0643A BE1013745A3 (en) 2000-10-10 2000-10-10 Method and device for casting continuous steel chemical composition a mixed.
    BE200000643 2000-10-10
    PCT/BE2001/000158 WO2002030598A1 (en) 2000-10-10 2001-09-18 Method and device for continuous casting of liquid steel

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    EP1330322B1 true EP1330322B1 (en) 2005-11-30

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    EP (1) EP1330322B1 (en)
    JP (1) JP4562347B2 (en)
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    US20030173721A1 (en) 2003-09-18
    CA2424085A1 (en) 2002-04-18
    EP1330322A1 (en) 2003-07-30
    JP4562347B2 (en) 2010-10-13
    KR100842026B1 (en) 2008-06-27
    US6913170B2 (en) 2005-07-05
    ES2253420T3 (en) 2006-06-01
    DE60115489D1 (en) 2006-01-05
    BE1013745A3 (en) 2002-07-02
    JP2004509771A (en) 2004-04-02
    KR20030037684A (en) 2003-05-14
    ATE311267T1 (en) 2005-12-15
    DE60115489T2 (en) 2006-07-20
    WO2002030598A1 (en) 2002-04-18
    CA2424085C (en) 2009-12-15

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