EP0401144A1 - Device and method for supplying molten metal to a continuous casting plant for thin products - Google Patents

Device and method for supplying molten metal to a continuous casting plant for thin products Download PDF

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Publication number
EP0401144A1
EP0401144A1 EP90470029A EP90470029A EP0401144A1 EP 0401144 A1 EP0401144 A1 EP 0401144A1 EP 90470029 A EP90470029 A EP 90470029A EP 90470029 A EP90470029 A EP 90470029A EP 0401144 A1 EP0401144 A1 EP 0401144A1
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EP
European Patent Office
Prior art keywords
nozzle
metal
liquid metal
orifices
continuous casting
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EP90470029A
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German (de)
French (fr)
Inventor
Jacques Petegnief
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Publication of EP0401144A1 publication Critical patent/EP0401144A1/en
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • 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

Definitions

  • the invention relates to the continuous casting of thin metallic products and more particularly the supply of liquid metal to the casting space defined by the walls of a continuous casting mold of elongated cross section, suitable for the casting of such products, this ingot mold can be of the type with fixed walls or of the type with movable walls.
  • One of the known problems for the casting of metal in an ingot mold of elongated section is to ensure a supply of substantially homogeneous liquid metal throughout the section of the ingot mold, to, on the one hand, ensure the homogeneity of the cast product during solidification and after it and, on the other hand, avoid solidification of the metal at the meniscus in the areas furthest from those where the supply of molten metal takes place.
  • the feeding of an ingot mold of this type by a single vertical nozzle placed in the center of the horizontal section of the casting space risks leading to colder zones on the edges of the casting space and to a premature solidification of the liquid metal in said zones.
  • the feeding by a single nozzle also creates in the liquid metal contained in the casting space convection movements which can have a harmful influence on the homogeneity of the cast product.
  • the purpose of the present invention is to solve the various problems mentioned above, and in particular to supply the ingot mold with liquid metal in a homogeneous manner over the entire width thereof.
  • the subject of the present invention is a device for supplying liquid metal to a mold for the continuous casting of thin products, the walls of which define a casting space, the cross section of which, at the outlet level of the product said ingot mold is elongated in a direction corresponding to the width of the cast product, and has a length equal to said width of the product.
  • this device is characterized in that it comprises a horizontal tubular nozzle in communication with at least one metal supply pipe, which extends in said direction corresponding to the width of the cast product, and comprises one or more liquid metal outlet orifices located in its lower part and in a configuration such that the said orifice (s) extend over the length of the nozzle and in that the said nozzle is situated at the level provided for the meniscus of the metal in the said ingot mold.
  • the total section of the outlet (s) for the liquid metal is greater than the outlet section of the ingot mold.
  • the device according to the invention has in particular three particular advantages.
  • this nozzle avoids contact of the liquid metal from the orifices with the ambient medium. Furthermore and above all, it makes it possible to limit the mechanical stresses to which the nozzle is subjected. Indeed, as the section of the casting space is very elongated, the length of the nozzle is important since it is desired that it covers as much as possible the width of the casting space (that is to say say the length of its section).
  • the tube constituting the nozzle is therefore of reduced external section which, combined with an internal section of the latter, as large as possible to limit the pressure drops and avoid clogging of the nozzle, resulting in a reduced wall thickness thereof.
  • the requirements of great length and small section of the nozzle therefore lead to a significant fragility of the latter made of refractory material little resistant to bending. If the nozzle were emerged, the risk of rupture would be significant, due to its own weight and especially the mass of metal it contains, while said nozzle is supported only by its ends or even only by one. Conversely, if the nozzle were completely submerged, it would be subjected by the cast metal to a significant Archimedes thrust due to the low density of the refractory which constitutes compared to that of the cast metal.
  • the arrangement according to the invention where the nozzle is located at the meniscus, preferably partially immersed, makes it possible to limit the mechanical stresses to which it is subjected, by regulating the level of metal in the ingot mold so as to substantially balance the forces s 'exercising on said nozzle.
  • the level in the ingot mold will therefore be regulated so that the assembly formed by the nozzle and the metal which it contains is almost "floating" on the surface of the liquid metal.
  • a third advantage resulting from the preferential arrangement where the total section of the outlet orifices is greater than the section of the cast product, is to limit the speed of exit of the metal through the orifices of the nozzle, and therefore to limit movements accordingly. convection of liquid metal in the mold.
  • the nozzle has several orifices substantially aligned along its lower generatrix, the section of each orifice increasing as a function of the distance between said orifice and the point of connection of said supply pipe on the nozzle.
  • the nozzle has a single orifice in the form of a longitudinal slot, the width of which increases with the distance from the connection point of said supply pipe on the nozzle.
  • the pressure drop of the metal flow in the tube can be compensated by the increase in the cross-section of the orifices or of the outlet slit in the zone furthest from the supply pipe, for that the flow of metal from each orifice, or from each zone of the slot, is substantially constant, thus guaranteeing the best possible homogeneity of supply over the entire width of the mold.
  • said metal supply pipe in the nozzle opens at one end thereof, or alternatively two supply pipes can be arranged which each open at one end of the nozzle.
  • This arrangement makes it possible in particular to feed the nozzle laterally with respect to the mold, through one of its "small walls” and therefore makes it possible to limit the ferrostatic pressure in said nozzle.
  • the casting installation shown in FIG. 1 comprises two cylinders 1 and 2 cooled and rotated in opposite directions, and two side walls, also called small faces 3, 4 held against the ends of the cylinders.
  • the installation comprises a distribution tank 7, located next to the cylinders.
  • This distribution tank communicates by a tube 8 for supplying the metal, which passes through the side wall 4 and opens into a supply nozzle 9.
  • This nozzle 9 extends horizontally in the casting space 6 over practically the entire width thereof, defined by the distance between the two side walls 3 and 4.
  • the nozzle 9 consists of a tube 10 made of refractory material , comprising in its lower part and over substantially its entire length a longitudinal slot 11.
  • the nozzle is located at level 14 of the meniscus of the liquid metal contained in the casting space.
  • the distribution tank 7 is supplied with liquid metal by a pouring tube 12 fixed to a bag or a dispenser, not shown, which contains the molten metal and is provided with a device for adjusting the flow rate of metal.
  • the liquid metal of the distribution tank flows through the supply pipe 8 into the nozzle 9 from where it leaves through the slot 11 to supply the pouring space.
  • the flow of liquid metal is permanently adjusted so as to maintain the level 14 of the metal 13 contained in the casting space at the level of the nozzle 9.
  • This metal solidified progressively in contact with the cooled walls of the cylinders 1 and 2, is pulled down due to the rotation of the cylinders to form the desired thin product 15.
  • the flow rate of the cast metal will be adjusted so that the nozzle 9 is partially immersed in the metal 13 contained in the casting space, which avoids subjecting it to strong mechanical stresses, as has been indicated previously.
  • the slot 11 of the nozzle has an elongated shape and its width varies as a function of the distance from the inlet pipe 8. As shown in FIG. 4, the width of the slot is small at its most close to said tube, and gradually increases to its other end 17. This arrangement makes it possible in particular to take account of the pressure drop of the liquid metal in the nozzle to ensure the most homogeneous flow possible over the entire length of this slot, and therefore across the width of the pouring space, in a way compensating for said pressure drop in the nozzle by an increased outlet section.
  • FIG. 5 represents a variant arrangement of the outlet orifices of the nozzle, constituted here by orifices 18 drilled radially in the tube 10 and aligned according to one of its generatices.
  • these orifices are of variable increasing section from one end 9 ′ of the neighboring nozzle of the supply tube 8 at the end 9 ⁇ furthest from the latter.
  • the variant shown in FIG. 3 relates to an installation in which the supply of liquid metal is carried out from two distribution tanks 7 and 7 ′ respectively on either side of the side walls 3 and 4. Each of these tanks is connected to one end of the nozzle 9 by the respective supply pipes 8 and 8 ′.
  • the nozzle then consists of a tube 10 ′ open at its two ends, extending over the entire width of the casting space and passing through each of the side walls 3, 4.
  • the outlet orifices 18 ′ of the nozzle consist of a plurality of holes aligned along a generatrix thereof and the cross section of which grows regularly from each of the ends of the nozzle towards the center of this one (see figure 6).
  • These orifices can likewise be produced in the form of a slot 11 ′ whose width increases from said ends towards the center as shown in FIG. 7.
  • the total section of said orifice (s) is preferably greater than the section of the cast product, that is to say the section of the space defined between the cylinders 1 and 2 and the side walls 3 and 4 , at the level of the neck 5, this in order to reduce as much as possible the speed of exit of the metal from said orifices to limit the convective movements of the liquid metal in the casting space.
  • the variation in the section of the orifices, or in the width of the slot, along the nozzle must be adapted precisely as a function of the dimensions of the nozzle and of the section of the cast product, and of the speed of extraction thereof. this.
  • the device can be adapted to supply the nozzle with a single supply pipe 8 ⁇ (FIG. 9), which can be connected directly to a single distributor located above the cylinders.
  • a single supply pipe 8 ⁇ (FIG. 9)
  • the tube 10 ⁇ forming the nozzle is closed at its two ends, and the supply pipe 8 ⁇ opens into the latter in its middle zone.
  • the arrangement of the outlet ports 18 ⁇ of the nozzle is then as shown in FIG. 8, where the section of the holes is minimal towards the middle of the nozzle and grows towards its ends.
  • This arrangement has the advantage of separating the nozzle from the side walls, but, as indicated above, can cause an increase in the ferrostatic pressure in the nozzle capable of increasing convection movements in the casting space.
  • the invention is not limited to the various variants of the device and to the method which have just been described by way of example.
  • the liquid metal flow rate can be adjusted to maintain the level in the pouring space only at the level of the outlet orifices of the nozzle, the latter therefore being practically not submerged. It is thus possible, in particular in the case of the use of such a nozzle in a conventional type ingot mold, the large walls of which are then substantially parallel and vertical, to avoid the formation of solidification bridges between the nozzle and said walls, due to the fact that the distance between the zones of the nozzle in contact with the cast metal (that is to say in this case only the edges of the slot or of the orifices of said nozzle) and said walls is then greater than the interval separating the external surface of the nozzle, up to its axis, from said walls.
  • the metal supply pipe in the nozzle does not pass through the side walls 4, as shown in FIG. 9, adjust the position of the nozzle according to the level of the liquid metal in the ingot mold to keep the nozzle partially immersed in the liquid metal or to maintain the outlet orifices of the nozzle at said level.
  • the metal level in the ingot mold can be adjusted according to the various casting parameters, and the position of the nozzle will be adjusted according to this level, for example by detecting this level and regulating, according to this measure, the height of the distributor, or of a tank dispenser, which carries said nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

This device comprises an ingot mould for continuous casting of thin products, whose walls define a casting space 6 whose cross-section, at the point of exit of the product cast from the said ingot mould, is lengthened in a direction corresponding to the width of the cast product and has a length equal to the said width of the product. It comprises a horizontal tubular spout 9 in communication with at least one inlet nozzle for the metal 8, which extends along the said direction and comprises one or more orifices 11, 18 for exit of the molten metal which are located in its lower portion and according to a configuration such that the orifice or orifices extend over the length of the spout. The said spout is located at the level provided for the meniscus of the metal 14 in the said ingot mould and, in accordance with the method according to the invention, the level of the molten metal is adjusted, during the casting, in order that the spout is partially immersed in the said metal. <IMAGE>

Description

L'invention concerne la coulée continue de produits métalliques minces et plus particulièrement l'alimentation en métal liquide de l'espace de coulée défini par les parois d'une lingotière de coulée continue de section transversale allongée, adaptée à la coulée de tels produits, cette lingotière pouvant être du type à parois fixes ou du type à parois mobiles.The invention relates to the continuous casting of thin metallic products and more particularly the supply of liquid metal to the casting space defined by the walls of a continuous casting mold of elongated cross section, suitable for the casting of such products, this ingot mold can be of the type with fixed walls or of the type with movable walls.

L'un des problèmes connus pour la coulée de métal dans une lingotière de section allongée est d'assurer une alimentation en métal liquide sensiblement homogène dans toute la section de la lingotière, pour, d'une part, assurer l'homogénéité du produit coulé en cours de solidification et après celle-ci et, d'autre part, éviter la solidification du métal au niveau du ménisque dans les zones les plus éloignées de celles où se fait l'apport du métal en fusion. Par exemple l'alimentation d'une lingotière de ce type par une seule busette verticale placée au centre de la section horizontale de l'espace de coulée risque de conduire à des zones plus froides sur les bords de l'espace de coulée et à une solidification prématurée du métal liquide dans lesdites zones. L'alimentation par une seule busette crée également dans le métal liquide contenu dans l'espace de coulée des mouvements de convection qui peuvent avoir une influence néfaste sur l'homogénéité du produit coulé.One of the known problems for the casting of metal in an ingot mold of elongated section is to ensure a supply of substantially homogeneous liquid metal throughout the section of the ingot mold, to, on the one hand, ensure the homogeneity of the cast product during solidification and after it and, on the other hand, avoid solidification of the metal at the meniscus in the areas furthest from those where the supply of molten metal takes place. For example, the feeding of an ingot mold of this type by a single vertical nozzle placed in the center of the horizontal section of the casting space risks leading to colder zones on the edges of the casting space and to a premature solidification of the liquid metal in said zones. The feeding by a single nozzle also creates in the liquid metal contained in the casting space convection movements which can have a harmful influence on the homogeneity of the cast product.

Pour remédier à ces problèmes, il a déjà été proposé d'alimenter la lingotière par plusieurs busettes verticales réparties sur la largeur de l'espace de coulée. Cette solution présente toutefois l'inconvénient de multiplier le nombre de busettes et donc leur coût, et aussi d'accroître le risque de détérioration de celles-ci. De plus si ces busettes sont émergées, il est nécessaire de protéger le jet de métal liquide qui en sort ; et si elles sont immergées, des ponts de solidification risquent de se former entre celles-ci ou entre les busettes et les parois de la lingotière dans le cas de lingotière à parois fixes, d'autant plus que dans ce cas, du fait de la faible largeur de la section de l'espace de coulée, les grandes parois de la lingotière sont relativement peu espacées l'une de l'autre.To remedy these problems, it has already been proposed to feed the ingot mold by several vertical nozzles distributed over the width of the casting space. However, this solution has the drawback of multiplying the number of nozzles and therefore their cost, and also of increasing the risk of their deterioration. In addition, if these nozzles have emerged, it is necessary to protect the jet of liquid metal which leaves therefrom; and if they are submerged, solidification bridges may form between them or between the nozzles and the walls of the mold in the case of a mold fixed walls, especially since in this case, due to the small width of the section of the casting space, the large walls of the mold are relatively spaced from one another.

Quel que soit le cas, les mouvements de convection résultant des jets issus des busettes ne peuvent être supprimés, notamment parce qu'il n'est pas possible de placer de nombreuses busettes côte à côte du fait de leur encombrement, et aussi parce que l'écoulement du métal liquide dans ces busettes se fait en charge et sous une pression ferrostatique nécessairement importante du fait de la hauteur de métal dans le répartiteur équipé de ces busettes.Whatever the case, the convection movements resulting from the jets from the nozzles cannot be suppressed, in particular because it is not possible to place many nozzles side by side due to their size, and also because the flow of the liquid metal in these nozzles takes place under load and under a necessarily high ferrostatic pressure due to the height of the metal in the distributor equipped with these nozzles.

Le but de la présente invention est de résoudre les différents problèmes évoqués ci-dessus, et notamment d'alimenter la lingotière en métal liquide de manière homogène sur toute la largeur de celle-ci.The purpose of the present invention is to solve the various problems mentioned above, and in particular to supply the ingot mold with liquid metal in a homogeneous manner over the entire width thereof.

Avec ces objectifs en vue, la présente invention a pour objet un dispositif d'alimentation en métal liquide d'une lingotière de coulée continue de produits minces dont les parois définissent un espace de coulée dont la section, au niveau de sortie du produit coulé de ladite lingotière, est allongée dans une direction correspondant à la largeur du produit coulé, et a une longueur égale à ladite largeur du produit.With these objectives in view, the subject of the present invention is a device for supplying liquid metal to a mold for the continuous casting of thin products, the walls of which define a casting space, the cross section of which, at the outlet level of the product said ingot mold is elongated in a direction corresponding to the width of the cast product, and has a length equal to said width of the product.

Selon l'invention ce dispositif est caractérisé en ce qu'il comprend une busette tubulaire horizontale en communication avec au moins une tubulure d'amenée du métal, qui s'étend selon ladite direction correspondant à la largeur du produit coulé, et comporte un ou des orifices de sortie du métal liquide situé dans sa partie inférieure et selon une configuration telle que le ou lesdits orifices s'étendent sur la longueur de la busette et en ce que ladite busette est située au niveau prévu du ménisque du métal dans ladite lingotière.According to the invention this device is characterized in that it comprises a horizontal tubular nozzle in communication with at least one metal supply pipe, which extends in said direction corresponding to the width of the cast product, and comprises one or more liquid metal outlet orifices located in its lower part and in a configuration such that the said orifice (s) extend over the length of the nozzle and in that the said nozzle is situated at the level provided for the meniscus of the metal in the said ingot mold.

Avantageusement, la section totale du ou des orifices de sortie du métal liquide est supérieure à la section de sortie de la lingotière.Advantageously, the total section of the outlet (s) for the liquid metal is greater than the outlet section of the ingot mold.

Le dispositif selon l'invention présente notamment trois avantages particuliers. En premier lieu, la configuration de la busette sous forme d'un tube disposé horizontalement dans l'espace de coulée et pourvu de un ou plusieurs orifices s'étendant, ou répartis, sur la longueur de la busette, permet une alimentation en métal liquide répartie sur toute la largeur de la lingotière par une seule busette tubulaire de réalisation aisée.The device according to the invention has in particular three particular advantages. First, the configuration of the nozzle in the form of a tube arranged horizontally in the pouring space and provided with one or more orifices extending, or distributed, along the length of the nozzle, allows a supply of liquid metal. distributed over the entire width of the mold by a single tubular nozzle of easy construction.

En second lieu, la disposition de cette busette à l'horizontale au niveau du ménisque du métal contenu dans la lingotière, permet d'éviter le contact du métal liquide issu des orifices avec le milieu ambiant. De plus et surtout, elle permet dè limiter les contraintes mécaniques auxquelles la busette est soumise. En effet, comme la section de l'espace de coulée est très allongée, la longueur de la busette est importante puisque l'on veut qu'elle couvre le plus possible la largeur de l'espace de coulée (c'est-à-dire la longueur de sa section). Comme par ailleurs, il est nécessaire de limiter l'encombrement transversal de la busette du fait de l'étroitesse de ladite section, le tube constituant la busette est donc de section extérieure réduite ce qui, combiné à une section intérieure de celui-ci la plus grande possible pour limiter les pertes de charge et éviter le bouchage de la busette, conduit à une épaisseur de paroi de celle-ci réduite. Les impératifs de grande longueur et de faible section de la busette conduisent donc à une fragilité importante de celle-ci réalisée en matériau réfractaire peu résistant à la flexion. Si la busette était émergée, le risque de rupture serait important, du fait de son propre poids et surtout de la masse de métal qu'elle contient, alors que ladite busette n'est soutenue que par ses extrémités ou même seulement par une seule. A l'inverse, si la busette était totalement immergée, elle serait soumise par le métal coulé à une poussée d'Archimède non négligeable du fait de la faible densité du réfractaire qui la constitue par rapport à celle du métal coulé.Second, the arrangement of this nozzle horizontally at the meniscus of the metal contained in the mold, avoids contact of the liquid metal from the orifices with the ambient medium. Furthermore and above all, it makes it possible to limit the mechanical stresses to which the nozzle is subjected. Indeed, as the section of the casting space is very elongated, the length of the nozzle is important since it is desired that it covers as much as possible the width of the casting space (that is to say say the length of its section). As in addition, it is necessary to limit the transverse dimensions of the nozzle because of the narrowness of said section, the tube constituting the nozzle is therefore of reduced external section which, combined with an internal section of the latter, as large as possible to limit the pressure drops and avoid clogging of the nozzle, resulting in a reduced wall thickness thereof. The requirements of great length and small section of the nozzle therefore lead to a significant fragility of the latter made of refractory material little resistant to bending. If the nozzle were emerged, the risk of rupture would be significant, due to its own weight and especially the mass of metal it contains, while said nozzle is supported only by its ends or even only by one. Conversely, if the nozzle were completely submerged, it would be subjected by the cast metal to a significant Archimedes thrust due to the low density of the refractory which constitutes compared to that of the cast metal.

La disposition selon l'invention, où la busette est située au niveau du ménisque, de préférence partiellement immergée, permet de limiter les contraintes mécaniques auxquelles elle est soumise, en régulant le niveau de métal dans la lingotière de manière à équilibrer sensiblement les efforts s'exerçant sur ladite busette. Autrement dit on régulera donc le niveau dans la lingotière de manière telle que l'ensemble formé par la busette et le métal qu'elle contient soit quasiment "flottant" à la surface du métal liquide.The arrangement according to the invention, where the nozzle is located at the meniscus, preferably partially immersed, makes it possible to limit the mechanical stresses to which it is subjected, by regulating the level of metal in the ingot mold so as to substantially balance the forces s 'exercising on said nozzle. In other words, the level in the ingot mold will therefore be regulated so that the assembly formed by the nozzle and the metal which it contains is almost "floating" on the surface of the liquid metal.

Un troisième avantage, résultant de la disposition préférentielle où la section totale des orifices de sortie est supérieure à la section du produit coulé, est de limiter la vitesse de sortie du métal par les orifices de la busette, et donc de limiter en conséquence les mouvements de convection du métal liquide dans la lingotière.A third advantage, resulting from the preferential arrangement where the total section of the outlet orifices is greater than the section of the cast product, is to limit the speed of exit of the metal through the orifices of the nozzle, and therefore to limit movements accordingly. convection of liquid metal in the mold.

Selon une disposition particulière de l'invention, la busette comporte plusieurs orifices sensiblement alignés selon sa génératrice inférieure, la section de chaque orifice croissant en fonction de la distance entre ledit orifice et le point de raccordement de ladite tubulure d'amenée sur la busette.According to a particular arrangement of the invention, the nozzle has several orifices substantially aligned along its lower generatrix, the section of each orifice increasing as a function of the distance between said orifice and the point of connection of said supply pipe on the nozzle.

Selon une autre disposition, la busette comporte un seul orifice sous forme de fente longitudinale dont la largeur croît avec la distance au point de raccordement de ladite tubulure d'amenée sur la busette.According to another arrangement, the nozzle has a single orifice in the form of a longitudinal slot, the width of which increases with the distance from the connection point of said supply pipe on the nozzle.

Grâce à ces dispositions, la perte de charge de l'écoulement du métal dans le tube peut être compensée par l'augmentation de la section des orifices ou de la fente de sortie dans la zone la plus éloignée de la tubulure d'amenée, pour que le débit de métal issu de chaque orifice, ou de chaque zone de la fente, soit sensiblement constant, garantissant ainsi la meilleure homogénéité possible d'alimentation sur toute la largeur de la lingotière.Thanks to these arrangements, the pressure drop of the metal flow in the tube can be compensated by the increase in the cross-section of the orifices or of the outlet slit in the zone furthest from the supply pipe, for that the flow of metal from each orifice, or from each zone of the slot, is substantially constant, thus guaranteeing the best possible homogeneity of supply over the entire width of the mold.

Préférentiellement ladite tubulure d'amenée du métal dans la busette débouche à une extrémité de celle-ci, ou encore on peut disposer deux tubulures d'amenée qui débouchent chacune à une extrémité de la busette. Cette disposition permet notamment d'alimenter la busette latéralement par rapport à la lingotière, au travers d'une de ses "petites parois" et donc permet de limiter la pression ferrostatique dans ladite busette.Preferably said metal supply pipe in the nozzle opens at one end thereof, or alternatively two supply pipes can be arranged which each open at one end of the nozzle. This arrangement makes it possible in particular to feed the nozzle laterally with respect to the mold, through one of its "small walls" and therefore makes it possible to limit the ferrostatic pressure in said nozzle.

On peut également envisager d'alimenter la busette à mi-longueur de celle-ci, soit vers le centre de la section de la lingotière.One can also consider feeding the nozzle at mid-length thereof, that is to the center of the section of the mold.

D'autres caractéristiques et avantages apparaîtront dans la description qui va être faite à titre d'exemple d'un dispositif conforme à l'invention, pour l'alimentation en acier liquide d'une installation de coulée continue entre cylindres.Other characteristics and advantages will appear in the description which will be given by way of example of a device according to the invention, for supplying liquid steel to a continuous casting installation between cylinders.

On se reportera aux dessins annexés dans lesquels :

  • - la figure 1 est une représentation schématique partielle d'une telle installation ;
  • - la figure 2 est une vue en coupe selon le plan de symétrie longitudinal P parallèle aux axes des cylindres, dans le cas d'une alimentation latéral par un seul côté ;
  • - la figure 3 est une vue analogue d'une variante dans le cas d'une alimentation par les deux côtés de la lingotière ;
  • - les figures 4 et 5 représentent deux variantes de disposition des orifices de sortie de la busette dans le cas représenté figure 2 ;
  • - les figures 6 et 7 représentent également deux variantes de disposition des ces orifices dans le cas représenté figure 3 ;
  • - les figures 8 et 9 représentent une troisième variante de disposition dans le cas d'une alimentation centrale de la busette par une tubulure verticale.
Reference is made to the appended drawings in which:
  • - Figure 1 is a partial schematic representation of such an installation;
  • - Figure 2 is a sectional view along the longitudinal plane of symmetry P parallel to the axes of the cylinders, in the case of a lateral supply from one side;
  • - Figure 3 is a similar view of a variant in the case of a supply from both sides of the mold;
  • - Figures 4 and 5 show two alternative arrangements of the nozzle outlet orifices in the case shown in Figure 2;
  • - Figures 6 and 7 also show two alternative arrangements of these holes in the case shown in Figure 3;
  • - Figures 8 and 9 show a third alternative arrangement in the case of a central supply of the nozzle by a vertical tube.

L'installation de coulée représentée à la figure 1 comporte deux cylindres 1 et 2 refroidis et entraînés en rotation en sens inverse, et deux parois latérales, encore appelées petites faces 3, 4 mainte- nues contre les extrémités des cylindres. La portion des cylindres située au-dessus du col 5 entre les cylindres, c 'est-à-dire au dessus du plan H passant par les axes de ceux-ci, définit avec les parois latérales 3, 4 un espace de coulée 6.The casting installation shown in FIG. 1 comprises two cylinders 1 and 2 cooled and rotated in opposite directions, and two side walls, also called small faces 3, 4 held against the ends of the cylinders. The portion of the cylinders located above the neck 5 between the cylinders, that is to say above the plane H passing through the axes of these, defines with the side walls 3, 4 a casting space 6.

Dans le cas exemplifié, représenté à la figure 2, où l'alimentation en métal liquide de l'espace de coulée se fait latéralement à travers l'une des parois latérales, l'installation comporte un bac de distribution 7, situé à côté des cylindres. Ce bac de distribution communique par une tubulure 8 d'amenée du métal, qui traverse la paroi latérale 4 et débouche dans une busette d'alimentation 9.In the exemplified case, represented in FIG. 2, where the supply of liquid metal to the pouring space takes place laterally through one of the side walls, the installation comprises a distribution tank 7, located next to the cylinders. This distribution tank communicates by a tube 8 for supplying the metal, which passes through the side wall 4 and opens into a supply nozzle 9.

Cette busette 9 s'étend horizontalement dans l'espace de coulée 6 sur pratiquement toute la largeur de celui-ci, définie par la distance entre les deux parois latérales 3 et 4. La busette 9 est constituée d'un tube 10 en matériau réfractaire, comportant dans sa partie inférieure et sur sensiblement toute sa longueur une fente longitudinale 11. La busette est située au niveau 14 prévu du ménisque du métal liquide contenu dans l'espace de coulée.This nozzle 9 extends horizontally in the casting space 6 over practically the entire width thereof, defined by the distance between the two side walls 3 and 4. The nozzle 9 consists of a tube 10 made of refractory material , comprising in its lower part and over substantially its entire length a longitudinal slot 11. The nozzle is located at level 14 of the meniscus of the liquid metal contained in the casting space.

Lors de la coulée, le bac de distribution 7 est alimenté en métal liquide par un tube de coulée 12 fixé à une poche ou un distributeur, non représenté, qui contient le métal en fusion et est pourvu d'un dispositif de réglage du débit de métal.During casting, the distribution tank 7 is supplied with liquid metal by a pouring tube 12 fixed to a bag or a dispenser, not shown, which contains the molten metal and is provided with a device for adjusting the flow rate of metal.

Le métal liquide du bac de distribution s'écoule par la tubulure d'amenée 8 dans la busette 9 d'où il sort par la fente 11 pour alimenter l'espace de coulée.The liquid metal of the distribution tank flows through the supply pipe 8 into the nozzle 9 from where it leaves through the slot 11 to supply the pouring space.

Conformément à l'invention, le débit de métal liquide est réglé en permanence de manière à maintenir le niveau 14 du métal 13 contenu dans l'espace de coulée à hauteur de la busette 9. Ce métal, solidifié progressivement au contact des parois refroidies des cylindres 1 et 2, est extrait vers le bas du fait de la rotation des cylindres pour former le produit mince désiré 15.In accordance with the invention, the flow of liquid metal is permanently adjusted so as to maintain the level 14 of the metal 13 contained in the casting space at the level of the nozzle 9. This metal, solidified progressively in contact with the cooled walls of the cylinders 1 and 2, is pulled down due to the rotation of the cylinders to form the desired thin product 15.

Préférentiellement, on réglera le débit du métal coulé de façon que la busette 9 soit partiellement immergée dans le métal 13 contenu dans l'espace de coulée, ce qui évite de soumettre celle-ci à de fortes contraintes mécaniques, comme cela a été indiqué précédemment.Preferably, the flow rate of the cast metal will be adjusted so that the nozzle 9 is partially immersed in the metal 13 contained in the casting space, which avoids subjecting it to strong mechanical stresses, as has been indicated previously.

La fente 11 de la busette a une forme allongée et sa largeur varie en fonction de la distance à la tubulure d'amenée 8. Ainsi que cela est représenté à la figure 4, la largeur de la fente est faible à son extrémité 16 la plus proche de ladite tubulure, et s'accroît progressivement jusqu'à son autre extrémité 17. Cette disposition permet en particulier de tenir compte de la perte de charge du métal liquide dans la busette pour assurer un débit le plus homogène possible sur toute la longueur de cette fente, et donc sur la largeur de l'espace de coulée, en compensant en quelque sorte ladite perte de charge dans la busette par une section de sortie accrue.The slot 11 of the nozzle has an elongated shape and its width varies as a function of the distance from the inlet pipe 8. As shown in FIG. 4, the width of the slot is small at its most close to said tube, and gradually increases to its other end 17. This arrangement makes it possible in particular to take account of the pressure drop of the liquid metal in the nozzle to ensure the most homogeneous flow possible over the entire length of this slot, and therefore across the width of the pouring space, in a way compensating for said pressure drop in the nozzle by an increased outlet section.

Le dessin de la figure 5 représente une variante de disposition des orifices de sortie de la busette, constitués ici par des orifices 18 percés radialement dans le tube 10 et alignés selon une des ses génératices. Avec le même objectif que ci-dessus, qui est de rendre le débit d'alimentation le plus homogène possible sur toute la largeur de l'espace de coulée, ces orifices sont de section variable croissante d'une extrémité 9′ de la busette voisine de la tubulure d'amenée 8 à l'extrémité 9˝ la plus éloignée de celle-ci.The drawing of FIG. 5 represents a variant arrangement of the outlet orifices of the nozzle, constituted here by orifices 18 drilled radially in the tube 10 and aligned according to one of its generatices. With the same objective as above, which is to make the feed flow as homogeneous as possible over the entire width of the pouring space, these orifices are of variable increasing section from one end 9 ′ of the neighboring nozzle of the supply tube 8 at the end 9˝ furthest from the latter.

La variante représentée figure 3 concerne une installation dans laquelle l'alimentation en métal liquide est réalisée à partir de deux bacs de distribution 7 et 7′ respectivement de part et d'autre des parois latérales 3 et 4. Chacun de ces bacs est relié à une extrémité de la busette 9 par les tubulures d'amenée respectives 8 et 8′. La busette est alors constituée d'un tube 10′ ouvert à ses deux extrémités, s'étendant sur toute la largeur de l'espace de coulée et traversant chacune des parois latérales 3, 4.The variant shown in FIG. 3 relates to an installation in which the supply of liquid metal is carried out from two distribution tanks 7 and 7 ′ respectively on either side of the side walls 3 and 4. Each of these tanks is connected to one end of the nozzle 9 by the respective supply pipes 8 and 8 ′. The nozzle then consists of a tube 10 ′ open at its two ends, extending over the entire width of the casting space and passing through each of the side walls 3, 4.

Dans le cas représenté à la figure 3, les orifices de sortie 18′ de la busette sont constitués d'une pluralité de perçages alignés selon une génératrice de celle-ci et dont la section croît régulièrement à partir de chacune des extrémités de la busette vers le centre de celle-ci (voir figure 6). Ces orifices peuvent de même être réalisés sous forme d'une fente 11′ dont la largeur s'accroît desdites extrémités vers le centre ainsi que représenté figure 7.In the case shown in FIG. 3, the outlet orifices 18 ′ of the nozzle consist of a plurality of holes aligned along a generatrix thereof and the cross section of which grows regularly from each of the ends of the nozzle towards the center of this one (see figure 6). These orifices can likewise be produced in the form of a slot 11 ′ whose width increases from said ends towards the center as shown in FIG. 7.

Ces différentes variantes de forme et répartition du ou des orifices de sortie de la busette ont toutes le même but exprimé précédemment de rendre l'alimentation de l'espace de coulée la plus homogène possible. Quelle que soit la variante, la section totale du ou desdits orifices est préférentiellement supérieure à la section du produit coulé c'est-à-dire à la section de l'espace défini entre les cylindres 1 et 2 et les parois latérales 3 et 4, au niveau du col 5, ceci afin de réduire la plus possible la vitesse de sortie du métal par lesdits orifices pour limiter les mouvements de convexion du métal liquide dans l'espace de coulée. Il est précisé que les formes, section et répartition du ou desdits orifices, représentés sur les dessins ne sont pas limitatives, et ont de plus été volontairement représentés de manière à faciliter la compréhension des explications données ci-dessus, sans nécessairement respecter les proportions relatives entre les orifices et, d'une part, la busette, et, d'autre part, la section du produit coulé.These different variants of shape and distribution of the outlet orifice (s) of the nozzle all have the same aim expressed previously to make the supply of the casting space as homogeneous as possible. Whatever the variant, the total section of said orifice (s) is preferably greater than the section of the cast product, that is to say the section of the space defined between the cylinders 1 and 2 and the side walls 3 and 4 , at the level of the neck 5, this in order to reduce as much as possible the speed of exit of the metal from said orifices to limit the convective movements of the liquid metal in the casting space. It is specified that the shapes, section and distribution of the said orifice (s), shown in the drawings are not limiting, and have moreover been voluntarily shown so as to facilitate understanding of the explanations given above, without necessarily respecting the relative proportions between the orifices and, on the one hand, the nozzle, and, on the other hand, the section of the cast product.

En particulier la variation de section des orifices, ou de largeur de la fente, le long de la busette devra être adapté précisément en fonction des dimensions de la busette et de la section du produit coulé, et de la vitesse d'extraction de celui-ci.In particular, the variation in the section of the orifices, or in the width of the slot, along the nozzle must be adapted precisely as a function of the dimensions of the nozzle and of the section of the cast product, and of the speed of extraction thereof. this.

Selon une autre variante encore, le dispositif peut être adapté à une alimentation de la busette par une seule tubulure d'amenée 8˝ (figure 9), qui peut être reliée directement à un répartiteur unique situé au-dessus des cylindres. Dans ce cas le tube 10˝ formant la busette est obturé à ses deux extrémités, et la tubulure d'amenée 8˝ débouche dans celui-ci dans sa zone médiane. La disposition des orifices de sortie 18˝ de la busette est alors telle que représentée à la figure 8, où la section des orifices est minimale vers le milieu de la busette et croît vers ses extrémités.According to yet another variant, the device can be adapted to supply the nozzle with a single supply pipe 8˝ (FIG. 9), which can be connected directly to a single distributor located above the cylinders. In this case, the tube 10˝ forming the nozzle is closed at its two ends, and the supply pipe 8˝ opens into the latter in its middle zone. The arrangement of the outlet ports 18˝ of the nozzle is then as shown in FIG. 8, where the section of the holes is minimal towards the middle of the nozzle and grows towards its ends.

Cette disposition présente l'avantage de désolidariser la busette des parois latérales, mais, comme indiqué précédemment, peut entraîner une augmentation de la pression ferrostatique dans la busette susceptible d'accroître les mouvements de convection dans l'espace de coulée.This arrangement has the advantage of separating the nozzle from the side walls, but, as indicated above, can cause an increase in the ferrostatic pressure in the nozzle capable of increasing convection movements in the casting space.

L'invention n'est pas limitée aux différentes variantes du dispositif et au procédé qui viennent d'être décrits titre d'exemple.The invention is not limited to the various variants of the device and to the method which have just been described by way of example.

En particulier on pourra régler le débit de métal liquide pour maintenir le niveau dans l'espace de coulée seulement à hauteur des orifices de sortie de la busette, celle-ci n'étant donc pratiquement pas immergée. On peut ainsi, notamment dans le cas d'utilisation d'une telle busette dans une lingotière de type classique, dont les parois de grandes dimensions sont alors sensiblement parallèles et verticales, éviter la formation de ponts de solidification entre la busette et lesdites parois, du fait que la distance entre les zones de la busette au contact du métal coulé (c'est-à-dire dans ce cas seulement les bords de la fente ou des orifices de ladite busette) et lesdites parois est alors supérieure à l'intervalle séparant la surface extérieure de la busette, à hauteur de son axe, desdites parois.In particular, the liquid metal flow rate can be adjusted to maintain the level in the pouring space only at the level of the outlet orifices of the nozzle, the latter therefore being practically not submerged. It is thus possible, in particular in the case of the use of such a nozzle in a conventional type ingot mold, the large walls of which are then substantially parallel and vertical, to avoid the formation of solidification bridges between the nozzle and said walls, due to the fact that the distance between the zones of the nozzle in contact with the cast metal (that is to say in this case only the edges of the slot or of the orifices of said nozzle) and said walls is then greater than the interval separating the external surface of the nozzle, up to its axis, from said walls.

On pourra aussi, notamment dans le cas où la tubulure d'amenée du métal dans la busette ne traverse pas les parois latérales 4, comme représenté à la figure 9, régler la position de la busette en fonction du niveau du métal liquide dans la lingotière pour maintenir la busette partiellement immergée dans le métal liquide ou pour maintenir les orifices de sortie de la busette audit niveau. Dans ce cas, le niveau de métal dans la lingotière pourra être réglé en fonction des divers paramètres de coulée, et on ajustera la position de la busette en fonction de ce niveau, par exemple en détectant ce niveau et en régulant, en fonction de cette mesure, la hauteur du répartiteur, ou d'un bac de distribution, qui porte ladite busette.It will also be possible, in particular in the case where the metal supply pipe in the nozzle does not pass through the side walls 4, as shown in FIG. 9, adjust the position of the nozzle according to the level of the liquid metal in the ingot mold to keep the nozzle partially immersed in the liquid metal or to maintain the outlet orifices of the nozzle at said level. In this case, the metal level in the ingot mold can be adjusted according to the various casting parameters, and the position of the nozzle will be adjusted according to this level, for example by detecting this level and regulating, according to this measure, the height of the distributor, or of a tank dispenser, which carries said nozzle.

On pourra également, notamment dans le cas d'une installation comportant deux bacs de distribution situés de part et d'autre de l'installation, utiliser deux busettes axialement alignées et reliées chacune respectivement à un bac. Ces busettes sont alors obturées à leur extrémité, telles que celles représentées aux figures 4 ou 5, et pénètrent chacune dans l'espace de coulée presque jusqu'au milieu de celui-ci. Cette disposition permet notamment de diviser par deux la longueur du tube constituant la busette et ainsi d'en faciliter la fabrication. De plus elle peut permettre d'individualiser les débits de métal liquide selon l'un ou l'autre côté de l'espace de coulée.It will also be possible, in particular in the case of an installation comprising two distribution tanks located on either side of the installation, to use two axially aligned nozzles each connected to a tank respectively. These nozzles are then closed at their end, such as those shown in Figures 4 or 5, and each enter the casting space almost to the middle of it. This arrangement makes it possible in particular to halve the length of the tube constituting the nozzle and thus to facilitate its manufacture. In addition, it can make it possible to individualize the flow rates of liquid metal according to one or the other side of the casting space.

Claims (13)

1) Dispositif d'alimentation en métal liquide d'une lingotière de coulée continue de produits minces dont les parois définissent un espace de coulée (6) dont la section, au niveau de sortie du produit coulé de ladite lingotière, est allongée dans une direction correspondant à la largeur du produit coulé, et a une longueur égale à ladite largeur du produit, caractérisé en ce qu'il comprend une busette tubulaire horizontale (9), en communication avec au moins une tubulure d'amenée du métal (8), qui s'étend selon ladite direction, et comporte un ou des orifices (11,18) de sortie du métal liquide situés dans sa partie inférieure et selon une configuration telle que le ou lesdits orifices s'étendent sur la longueur de la busette et en ce que ladite busette est située au niveau prévu du ménisque du métal (14) dans ladite lingotière.1) Device for supplying liquid metal to an ingot mold for continuous casting of thin products, the walls of which define a casting space (6) the cross section of which, at the outlet level of the cast product from said ingot mold, is elongated in one direction corresponding to the width of the cast product, and has a length equal to said width of the product, characterized in that it comprises a horizontal tubular nozzle (9), in communication with at least one metal supply pipe (8), which extends in said direction, and comprises one or more orifices (11, 18) for the outlet of the liquid metal situated in its lower part and in a configuration such that the or said orifices extend over the length of the nozzle and in that said nozzle is located at the expected level of the meniscus of the metal (14) in said ingot mold. 2) Dispositif selon la revendication 1, caractérisé en ce que la busette comporte plusieurs orifices (18,18′) sensiblement alignés selon sa génératrice inférieure, la section de chaque orifice croissant en fonction de la distance entre ledit orifice et le point de raccordement de ladite tubulure d'amenée (8,8′) sur la busette.2) Device according to claim 1, characterized in that the nozzle has several orifices (18,18 ′) substantially aligned along its lower generatrix, the section of each orifice increasing as a function of the distance between said orifice and the connection point of said supply pipe (8.8 ′) on the nozzle. 3) Dispositif selon la revendication 1, caractérisé en ce que la busette comporte un seul orifice sous forme de fente longitudinale (11) dont la largeur croît avec la distance au point de raccordement de ladite tubulure d'amenée sur la busette.3) Device according to claim 1, characterized in that the nozzle has a single orifice in the form of a longitudinal slot (11) whose width increases with the distance to the connection point of said supply pipe on the nozzle. 4) Dispositif selon la revendication 1, caractérisée en ce que la section totale du ou des orifices de la busette est supérieure à la section de sortie de la lingotière.4) Device according to claim 1, characterized in that the total section of the orifice (s) of the nozzle is greater than the outlet section of the mold. 5) Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que ladite tubulure d'amenée (8˝) débouche dans la busette à mi-longueur de celle-ci.5) Device according to one of claims 1 to 4, characterized in that said supply tube (8˝) opens into the nozzle at mid-length thereof. 6) Dispositif selon l'une des revendications 1 à 4 caractérisé en ce que ladite tubulure d'amenée (8) débouche dans la busette à une de ses extrémités.6) Device according to one of claims 1 to 4 characterized in that said supply pipe (8) opens into the nozzle at one of its ends. 7) Dispositif selon l'une des revendications 1 à 4, caractérisé en ce qu'il comporte deux tubulures d'amenée (8,8′) qui débouchent chacun à une extrémité de ladite busette.7) Device according to one of claims 1 to 4, characterized in that it comprises two supply pipes (8.8 ′) which each open at one end of said nozzle. 8) Busette tubulaire d'alimentation en métal liquide d'une installation de coulée continue de produits minces, comportant au moins un orifice d'entrée du métal, caractérisée en ce qu'elle comporte une pluralité d'orifices de sortie (18,18′,18˝) sensiblement alignés selon une génératrice, et dont la section croît en fonction de la distance à ou auxdits orifices d'entrée.8) Tubular nozzle for supplying liquid metal to an installation for continuous casting of thin products, comprising at least one metal inlet port, characterized in that it comprises a plurality of outlet ports (18,18 ′, 18˝) substantially aligned according to a generator, and whose section increases as a function of the distance to or from said inlet orifices. 9) Busette tubulaire d'alimentation en métal liquide d'une installation de coulée continue de produits minces, comportant au moins un orifice d'entrée, caractérisée en ce qu'elle comporte un orifice de sortie sous forme d'une fente longitudinale (11,11′) dont la largeur croît en fonction de la distance à ou auxdits orifices d'entrée.9) Tubular liquid metal supply nozzle for a continuous casting installation for thin products, comprising at least one inlet port, characterized in that it comprises an outlet port in the form of a longitudinal slot (11 , 11 ′) whose width increases as a function of the distance to or from said inlet orifices. 10) Procédé de coulée continue de produits métalliques minces caractérisé en ce que on utilise le dispositif selon l'une des revendications 1 à 7 et on règle en permanence le débit d'alimentation en métal liquide de la lingotière pour maintenir le niveau de la surface libre (14) du métal liquide contenu dans la lingotière à la hauteur des orifices de sortie de la busette.10) A method of continuous casting of thin metal products characterized in that the device according to one of claims 1 to 7 is used and the flow rate of liquid metal supply to the ingot mold is continuously adjusted to maintain the level of the surface free (14) of the liquid metal contained in the ingot mold at the height of the outlet orifices of the nozzle. 11) Procédé de coulée continue de produits métalliques minces caractérisé en ce que on utilise le dispositif selon l'une des revendications 1 à 7 et on règle en permanence le débit d'alimentation en métal liquide de la lingotière pour maintenir la busette partiellement immergé dans ledit métal liquide.11) A process for continuous casting of thin metal products characterized in that the device according to one of claims 1 to 7 is used and the flow rate of liquid metal supply to the ingot mold is continuously adjusted to keep the nozzle partially submerged in said liquid metal. 12) Procédé de coulée continue de produits métalliques minces caractérisé en ce que on utilise le dispositif selon l'une des revendications l à 7 et on règle en permanence la position de la busette en fonction du niveau du métal liquide dans la lingotière pour maintenir la busette partiellement immergée dans ledit métal liquide.12) A process for continuous casting of thin metallic products characterized in that the device according to one of claims 1 to 7 is used and the position of the nozzle is permanently adjusted as a function of the level of the liquid metal in the ingot mold to maintain the nozzle partially immersed in said liquid metal. 13) Procédé de coulée continue de produits métalliques minces caractérisé en ce que on utilise le dispositif selon l'une des revendications 1 à 7 et on règle en permanence la position de la busette en fonction du niveau du métal liquide dans la lingotière pour maintenir les orifices de sortie de la busette audit niveau.13) A method of continuous casting of thin metal products characterized in that the device according to one of claims 1 to 7 is used and the position of the nozzle is permanently adjusted as a function of the level of liquid metal in the ingot mold to maintain the outlet ports of the nozzle at said level.
EP90470029A 1989-05-31 1990-05-21 Device and method for supplying molten metal to a continuous casting plant for thin products Withdrawn EP0401144A1 (en)

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FR8907286 1989-05-31
FR8907286A FR2647698A1 (en) 1989-05-31 1989-05-31 LIQUID METAL SUPPLY DEVICE FOR A CONTINUOUS CASTING PLANT FOR THIN PRODUCTS AND METHOD FOR ITS IMPLEMENTATION

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FR2739313A1 (en) * 1995-09-28 1997-04-04 Usinor Sacilor NOZZLE FOR THE INTRODUCTION OF A LIQUID METAL INTO A CONTINUOUS CASTING LINGOTIERE OF METALS
US5733469A (en) * 1995-09-28 1998-03-31 Usinor Sacilor Nozzle for introducing a liquid metal into a mold for continuous casting of metals
CN1064286C (en) * 1995-09-28 2001-04-11 于西纳公司 Nozzle for introducing liquid metal into mould for continuous casting of metals
FR2740367A1 (en) * 1995-10-30 1997-04-30 Usinor Sacilor NOZZLE FOR THE INTRODUCTION OF A LIQUID METAL INTO A CONTINUOUS CASTING LINGOTIERE OF METAL PRODUCTS, THE BOTTOM OF WHICH HAS ORIFICES
EP0771600A1 (en) * 1995-10-30 1997-05-07 Usinor Sacilor Immersion discharge nozzle with bottom orifices for the introduction of molten metal in a mould for continuous casting of metallic products
US5840206A (en) * 1995-10-30 1998-11-24 Thyssen Stahl Aktiengesellschaft Nozzle for introducing a liquid metal into a mold, for the continuous casting of metal products, the bottom of which has holes
CN1068807C (en) * 1995-10-30 2001-07-25 犹齐诺-萨西洛公司 Nozzle for introducing liquid metal into mould, for continuous casting of metal products, bottom of which has holes

Also Published As

Publication number Publication date
FR2647698A1 (en) 1990-12-07
CA2017043A1 (en) 1990-11-30
DD294645A5 (en) 1991-10-10
JPH0327846A (en) 1991-02-06
KR900017690A (en) 1990-12-19
AU5606390A (en) 1990-12-06
BR9002556A (en) 1991-08-13

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