EP0847821A1 - Reservoir for supplying a liquid metal, especially a liquid steel - Google Patents

Reservoir for supplying a liquid metal, especially a liquid steel Download PDF

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Publication number
EP0847821A1
EP0847821A1 EP97402668A EP97402668A EP0847821A1 EP 0847821 A1 EP0847821 A1 EP 0847821A1 EP 97402668 A EP97402668 A EP 97402668A EP 97402668 A EP97402668 A EP 97402668A EP 0847821 A1 EP0847821 A1 EP 0847821A1
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EP
European Patent Office
Prior art keywords
tank
refractory
cavity
molten metal
jet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97402668A
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German (de)
French (fr)
Inventor
Hervé Tavernier
Etienne Havette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ugine SA
Ugitech SA
Original Assignee
Ugine Savoie SA
USINOR Sacilor SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ugine Savoie SA, USINOR Sacilor SA filed Critical Ugine Savoie SA
Publication of EP0847821A1 publication Critical patent/EP0847821A1/en
Withdrawn legal-status Critical Current

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
    • 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
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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

Definitions

  • the invention relates to a supply tank for retaining a molten metal and in particular a steel, tank comprising a bottom refractory, refractory partitions, at least one formed nozzle in the refractory bottom to evacuate the molten metal from the tank, a refractory pad comprising a cavity, placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank.
  • the supply tank constitutes the transfer reactor between the ladle and the casting mold.
  • the improvement in the operation of the supply tank is achieved by the use of cladding such as for example, an impact slab placed at the bottom of the tank, directly above a jet protective tube located under the ladle.
  • This impact slab is also called "buffer”.
  • the primary function of the tampon is generally to reduce the turbulence of the liquid metal jet coming from the ladle and entering in the tank, by the degradation of the energy of the liquid metal jet falling vertically onto said impact slab.
  • the buffer can limit short circuits, this is to say the durations at the end of which the first fluid stream of steel leaves the tank and / or increase the residence times, i.e. the durations of presence of fluid steel nets in the tank.
  • the object of the invention is to provide a specific degradation zone energy of the incoming liquid metal jet and simultaneously ensure a refractory reserve in the buffer in order to compensate for its wear under the violent impact of the flow of liquid metal entering the tank.
  • the object of the invention is a supply tank intended for retain a molten metal and in particular a steel, tank comprising a refractory pad comprising a cavity, the pad placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank, characterized in that that the tampon cavity is formed of a tampon bottom and a wall substantially vertical, the surface of the buffer base defining a convex volume.
  • Figure 1 is a diagram showing a sequence of downstream production of steel.
  • Figure 2 is a sectional representation of an example of production of a refractory pad according to the invention.
  • Figure 3 is a sectional representation of another example for producing a refractory pad according to the invention.
  • Figure 4 is a sectional representation of another example for producing a refractory pad according to the invention.
  • Figure 5 is a sectional representation of another example for producing a refractory pad according to the invention.
  • a ladle 1 for casting supplies a reservoir supply 2, also called distributor or distributor, the supply tank 2 discharging the liquid metal 3 into a ingot mold 4 for continuous casting.
  • the metal supply tank 2 includes a bottom refractory 5, refractory partitions 6 intended to retain the metal melted in the feed tank 2, at least one nozzle 7 formed in the refractory bottom 5 which evacuates by flow, the metal molten tank 2.
  • a refractory pad 8 comprising a cavity 9, is placed on the bottom of the tank 2. It is intended to receive a jet 10 of molten metal from the pocket 1 moved above the tank 2.
  • the cavity 9 of the pad 8 is formed by a pad bottom 11 and a wall 12 substantially vertical.
  • the surface of the buffer base 11 defines a convex volume, that is to say that any segment that joins any two points on the surface delimiting the volume is contained in this volume.
  • the buffer base 11 in its convex shape, generates, with the wall 12 substantially vertical lateral of the cavity 9, an angle of strong degradation of the energy of the jet of liquid steel entering the cavity 9 of buffer 8.
  • the acute angle generated by the shape of the buffer base 11 and the wall 12 substantially vertical of the cavity 9 is a degradation zone energy of the incoming liquid metal jet and promotes its ascent along from said wall 12 to the metal surface and the slag layer contained in the supply tank, the metal escaping from the buffer essentially by the upper opening thereof.
  • the wall 12 has a function of blocking the metal which, associated with the closing effect of the buffer base 11, calms efficiently the energy of the jet.
  • the energy attenuation effect is shown in the figures by a spiral arrow.
  • Another advantage of the invention is linked to the fact that the bottom constitutes a relatively large reserve of refractory, a reserve which alleviates wear following the violent impact of the jet of molten steel entering, especially when opening pocket 1.
  • the pad 8 is a refractory concrete piece, which can be monobloc, fixed on the bottom 5 of the tank and placed directly above the tube for protecting the jet 10 from the ladle 1.
  • the stamp can have any geometric shape. He's from preferably parallelepiped or cylindrical.
  • the stamp is made of preferably by molding.
  • the substantially vertical walls include a skin which ensures easy release of the tampon.
  • the wall 12 is relatively high compared to the dimensions of the melts to allow the accumulation of metal from the pocket, the degradation of its energy, and the rise of said metal along from wall 12 to the slag.
  • the wall 12 prevents metal nets liquids go directly towards the tap holes. In addition, the wall makes it possible to extend the residence time of the metal in the tank feed.
  • the bottom 11 of the cavity 9a of preferably, when the buffer is rectangular, the shape of a pyramid, associated with four substantially flat side walls and vertical.
  • the buffer generates between the bottom and the walls, four zones of strong energy degradation of the liquid steel jet entering.
  • the bottom 11 of the cavity 9 preferably has when the pad is cylindrical, the shape of a cone, associated with a side wall substantially cylindrical and vertical.
  • the stamp generates between the bottom and the wall, a strong crown of degradation energy of the incoming liquid steel jet.
  • the bottom surface defines a vertex which can be placed either in the vertical axis of the jet, or slightly moved relative to the axis of the jet. Moving the tampon can generate a rotary movement of the steel flow, the rotary movement participating in the degradation of the energy of the incoming steel jet.
  • the bottom surface defines a vertex whose height remains much less than the height of wall 12.
  • the pad 8 comprises, drilled in the wall 12, at least one hole drain 16 ensuring on the one hand, a flow of steel in the bottom 5 of the tank, in particular, before the filling steel overflows the tampon, and on the other hand, emptying of the cavity 9 of said tampon in end of casting.
  • the internal wall 12 of the cavity 9 comprises at least one peripheral bead 13 located in a substantially horizontal plane and closing all or part of the cavity.
  • the bead 13 can be arranged on the surface of wall 12 at a any height relative to the buffer base 11, for example at mid height of the wall 12, thus separating the cavity into two parts.
  • the space of the cavity locally reduced, for example, at the outlet of the cavity brings back, after the impact of the jet, the steel flow towards the axis of the jet steel which accentuates the energy degradation effect.
  • the peripheral bead 13 comprises at least one part folded back 14 towards the buffer base 11.
  • the flow is folded down towards the bottom of the cavity to accentuate the degradation of energy.
  • the internal wall of the cavity comprises a series of peripheral beads 15 located in a substantially horizontal plane, defining a corrugated inner wall. Ripples reduce, with the inclination of the convex bottom, the sharp degradation angle of the energy of the liquid steel flow as well when the metal builds up in the bottom of the pad only when it rises on the wall, after the impact of the molten steel jet on the bottom 11.
  • said beads can be produced in the form of independent pieces, as for example crowns fitting on the wall 12. Indeed molding into a block of parts comprising a closed space generating for example undercuts is difficult to achieve.
  • the proposed reservoir provided with the buffer according to the invention optimizes the reduction of the turbulence of the liquid steel in the impact zone of the reservoir through the creation of areas of high energy degradation. he also optimizes short circuit times and residence times, which which improves the cleanliness of the steel produced.
  • the tampon according to the invention promotes flow. piston and reduces the transition time, i.e. the time required to switch from casting a shade A to casting a shade B, or again, the time during which the tank contains the end of the pouring of grade A and the start of casting of grade B.
  • Such a pad easy to make, can be inserted alone in the tank, which eliminates the use of skins annexes such as dams, weirs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The feed reservoir holds a molten metal, e.g. steel, and comprises a refractory bottom, some refractory partitions, at least one nozzle, arranged in the refractory bottom in order to evacuate by flowing of the molten metal from the reservoir, and a refractory stopper (8). The stopper (8) incorporates a cavity (9) and is placed on the bottom of the reservoir. The cavity (9) receives the jet of molten metal from a ladle placed above the reservoir. The cavity (9) in the stopper (8) is formed by a stopper bottom (11) and an essentially vertical wall, the surface of the stopper bottom defining a convex volume, e.g. in the form of a pyramid or a cone. The reservoir incorporates at least one draining hole.

Description

L'invention concerne un réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier, réservoir comprenant un fond réfractaire, des cloisons réfractaires, au moins une busette ménagée dans le fond réfractaire pour évacuer par écoulement le métal fondu du réservoir, un tampon réfractaire comportant une cavité, placé sur le fond du réservoir et destiné à recevoir un jet de métal fondu en provenance d'une poche déplacée au-dessus dudit réservoir.The invention relates to a supply tank for retaining a molten metal and in particular a steel, tank comprising a bottom refractory, refractory partitions, at least one formed nozzle in the refractory bottom to evacuate the molten metal from the tank, a refractory pad comprising a cavity, placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank.

L'élaboration en aval d'un acier se fait suivant une séquence mettant en jeu une poche de coulée, se déversant dans un réservoir d'alimentation appelé distributeur ou répartiteur, le réservoir d'alimentation fournissant en métal liquide une lingotière de coulée.The downstream development of a steel is done in a sequence involving a ladle, pouring into a tank supply called distributor or distributor, the tank supplying liquid metal with a casting mold.

Le réservoir d'alimentation constitue le réacteur de transfert entre la poche de coulée et la lingotière de coulée.The supply tank constitutes the transfer reactor between the ladle and the casting mold.

Les fonctions du réservoir d'alimentation ou répartiteur sont :

  • de transférer l'acier liquide de la poche de coulée vers la lingotière de coulée,
  • de répartir l'acier liquide sur les différentes lignes de coulée,
  • d'amener l'acier fondu à l'état non turbulent dans la lingotière,
  • de réaliser des coulées en séquence,
  • d'éliminer dans certaines conditions, les plus grosses inclusions contenues dans l'acier liquide par le biais, par exemple, d'habillages, de rampes de bullage.
The functions of the supply tank or distributor are:
  • to transfer the liquid steel from the ladle to the casting mold,
  • to distribute the liquid steel on the different casting lines,
  • to bring the molten steel in a non-turbulent state into the ingot mold,
  • to carry out castings in sequence,
  • to eliminate under certain conditions, the largest inclusions contained in the liquid steel by means, for example, of dressings, of bubbling ramps.

L'amélioration du fonctionnement du réservoir d'alimentation est réalisée par l'usage d'habillage comme par exemple, une dalle d'impact posée au fond du réservoir, en aplomb d'un tube protecteur de jet situé sous la poche de coulée. Cette dalle d'impact est aussi appelée "tampon".The improvement in the operation of the supply tank is achieved by the use of cladding such as for example, an impact slab placed at the bottom of the tank, directly above a jet protective tube located under the ladle. This impact slab is also called "buffer".

Le tampon a généralement pour fonction première de réduire la turbulence du jet de métal liquide issu de la poche de coulée et entrant dans le réservoir, par la dégradation de l'énergie du jet de métal liquide tombant, verticalement, sur ladite dalle d'impact.The primary function of the tampon is generally to reduce the turbulence of the liquid metal jet coming from the ladle and entering in the tank, by the degradation of the energy of the liquid metal jet falling vertically onto said impact slab.

Dans certains cas, le tampon peut limiter les courts circuits, c'est à dire les durées au bout desquelles le premier filet fluide d'acier sort du réservoir et/ou augmenter les temps de séjour, c'est à dire les durées de présence en réservoir des filets fluides d'acier. In some cases, the buffer can limit short circuits, this is to say the durations at the end of which the first fluid stream of steel leaves the tank and / or increase the residence times, i.e. the durations of presence of fluid steel nets in the tank.

Le but de l'invention est de ménager une zone spécifique de dégradation d'énergie du jet du métal liquide entrant et d'assurer, simultanément, une réserve de réfractaire dans le tampon en vue de compenser son usure sous l'impact violent du flux de métal liquide entrant dans le réservoir.The object of the invention is to provide a specific degradation zone energy of the incoming liquid metal jet and simultaneously ensure a refractory reserve in the buffer in order to compensate for its wear under the violent impact of the flow of liquid metal entering the tank.

L'objet de l'invention est un réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier, réservoir comprenant un tampon réfractaire comportant une cavité, le tampon, placé sur le fond du réservoir et destiné à recevoir un jet de métal fondu en provenance d'une poche déplacée au-dessus dudit réservoir, se caractérisant en ce que la cavité du tampon est formée d'un fond de tampon et d'une paroi sensiblement verticale, la surface du fond de tampon définissant un volume convexe.The object of the invention is a supply tank intended for retain a molten metal and in particular a steel, tank comprising a refractory pad comprising a cavity, the pad placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank, characterized in that that the tampon cavity is formed of a tampon bottom and a wall substantially vertical, the surface of the buffer base defining a convex volume.

Les autres caractéristiques de l'invention sont :

  • la surface du fond de tampon définit un volume convexe comportant un sommet situé sensiblement dans l'axe du jet de métal fondu ;
  • la surface du fond de tampon définit une pyramide ;
  • la surface du fond de tampon définit un cône ;
  • le tampon comporte au moins un trou de vidange ;
  • la paroi interne de la cavité comporte au moins un bourrelet périphérique situé dans un plan sensiblement horizontal ;
  • le bourrelet périphérique comporte au moins une partie rabattue vers le fond de tampon ;
  • la paroi interne de la cavité comporte une série de bourrelets périphériques situés dans un plan sensiblement horizontal et définissant une paroi interne ondulée.
The other characteristics of the invention are:
  • the surface of the buffer base defines a convex volume comprising an apex situated substantially in the axis of the jet of molten metal;
  • the surface of the buffer base defines a pyramid;
  • the surface of the buffer base defines a cone;
  • the tampon has at least one drain hole;
  • the internal wall of the cavity comprises at least one peripheral bead located in a substantially horizontal plane;
  • the peripheral bead comprises at least one part folded down towards the bottom of the tampon;
  • the internal wall of the cavity comprises a series of peripheral beads situated in a substantially horizontal plane and defining a corrugated internal wall.

La description qui suit et les figures annexées, le tout donné à titre d'exemple non limitatif, fera bien comprendre l'invention.The following description and the attached figures, all given to by way of nonlimiting example, will make the invention well understood.

La figure 1 est un schéma présentant une séquence de l'élaboration aval d'un acier.Figure 1 is a diagram showing a sequence of downstream production of steel.

La figure 2 est une représentation, en coupe, d'un exemple de réalisation d'un tampon réfractaire selon l'invention.Figure 2 is a sectional representation of an example of production of a refractory pad according to the invention.

La figure 3 est une représentation, en coupe, d'un autre exemple de réalisation d'un tampon réfractaire selon l'invention.Figure 3 is a sectional representation of another example for producing a refractory pad according to the invention.

La figure 4 est une représentation, en coupe, d'un autre exemple de réalisation d'un tampon réfractaire selon l'invention. Figure 4 is a sectional representation of another example for producing a refractory pad according to the invention.

La figure 5 est une représentation, en coupe, d'un autre exemple de réalisation d'un tampon réfractaire selon l'invention.Figure 5 is a sectional representation of another example for producing a refractory pad according to the invention.

Dans l'élaboration aval d'un métal notamment d'un acier, comme représenté sur la figure 1, une poche 1 de coulée alimente un réservoir d'alimentation 2, appelé également distributeur ou répartiteur, le réservoir d'alimentation 2 déversant le métal liquide 3 dans une lingotière 4 de coulée continue.In the downstream development of a metal, in particular a steel, such as represented in FIG. 1, a ladle 1 for casting supplies a reservoir supply 2, also called distributor or distributor, the supply tank 2 discharging the liquid metal 3 into a ingot mold 4 for continuous casting.

Le réservoir d'alimentation en métal 2, comprend un fond réfractaire 5, des cloisons réfractaires 6 destinées à retenir le métal fondu dans le réservoir d'alimentation 2, au moins une busette 7 ménagée dans le fond réfractaire 5 qui évacue par écoulement, le métal fondu du réservoir 2. Un tampon réfractaire 8 comportant une cavité 9, est placé sur le fond du réservoir 2. Il est destiné à recevoir un jet 10 de métal fondu en provenance de la poche 1 déplacée au-dessus du réservoir 2.The metal supply tank 2, includes a bottom refractory 5, refractory partitions 6 intended to retain the metal melted in the feed tank 2, at least one nozzle 7 formed in the refractory bottom 5 which evacuates by flow, the metal molten tank 2. A refractory pad 8 comprising a cavity 9, is placed on the bottom of the tank 2. It is intended to receive a jet 10 of molten metal from the pocket 1 moved above the tank 2.

Dans une première forme de l'invention, dans le domaine de l'élaboration de l'acier, comme représentée sur la figure 2, la cavité 9 du tampon 8 est formée d'un fond de tampon 11 et d'une paroi 12 sensiblement verticale. Selon une caractéristique de l'invention, la surface du fond de tampon 11 définit un volume convexe, c'est à dire que tout segment qui joint deux points quelconques de la surface délimitant le volume est contenu dans ce volume.In a first form of the invention, in the field of the development of steel, as shown in Figure 2, the cavity 9 of the pad 8 is formed by a pad bottom 11 and a wall 12 substantially vertical. According to a characteristic of the invention, the surface of the buffer base 11 defines a convex volume, that is to say that any segment that joins any two points on the surface delimiting the volume is contained in this volume.

Le fond de tampon 11, dans sa forme convexe, génère, avec la paroi 12 sensiblement verticale latérale de la cavité 9, un angle de dégradation forte de l'énergie du jet 10 d'acier liquide entrant dans la cavité 9 du tampon 8.The buffer base 11, in its convex shape, generates, with the wall 12 substantially vertical lateral of the cavity 9, an angle of strong degradation of the energy of the jet of liquid steel entering the cavity 9 of buffer 8.

L'angle aigu généré par la forme du fond de tampon 11 et la paroi 12 sensiblement verticale de la cavité 9 est une zone de dégradation d'énergie du jet de métal liquide entrant et favorise sa remontée le long de ladite paroi 12 vers la surface du métal et la couche de laitier contenu dans le réservoir d'alimentation, le métal s'échappant du tampon essentiellement par l'ouverture supérieure de celui-ci.The acute angle generated by the shape of the buffer base 11 and the wall 12 substantially vertical of the cavity 9 is a degradation zone energy of the incoming liquid metal jet and promotes its ascent along from said wall 12 to the metal surface and the slag layer contained in the supply tank, the metal escaping from the buffer essentially by the upper opening thereof.

En d'autres termes, la paroi 12 a une fonction de blocage du métal qui, associé à l'effet de fermeture du fond de tampon 11, calme de manière efficace l'énergie du jet.In other words, the wall 12 has a function of blocking the metal which, associated with the closing effect of the buffer base 11, calms efficiently the energy of the jet.

L'effet d'atténuation de l'énergie est représentée sur les figures par une flèche en spirale. The energy attenuation effect is shown in the figures by a spiral arrow.

Un autre avantage de l'invention est lié au fait que le fond constitue une réserve relativement importante de réfractaire, réserve qui pallie l'usure consécutive à l'impact violent du jet de l'acier fondu entrant, en particulier lors de l'ouverture de la poche 1.Another advantage of the invention is linked to the fact that the bottom constitutes a relatively large reserve of refractory, a reserve which alleviates wear following the violent impact of the jet of molten steel entering, especially when opening pocket 1.

Le tampon 8 est une pièce en béton réfractaire, pouvant être monobloc, fixée sur le fond 5 du réservoir et disposé à l'aplomb de tube de protection du jet 10 de la poche 1 de coulée.The pad 8 is a refractory concrete piece, which can be monobloc, fixed on the bottom 5 of the tank and placed directly above the tube for protecting the jet 10 from the ladle 1.

Le tampon peut avoir toute forme géométrique. Il est de préférence, parallélépipèdique ou cylindrique. Le tampon est réalisé de préférence par moulage. Les parois sensiblement verticales comportent une dépouille qui assure un démoulage aisé du tampon.The stamp can have any geometric shape. He's from preferably parallelepiped or cylindrical. The stamp is made of preferably by molding. The substantially vertical walls include a skin which ensures easy release of the tampon.

La paroi 12 est relativement haute par rapport aux dimensions du fond de façon à permettre l'accumulation du métal en provenance de la poche, la dégradation de son énergie, et la remontée dudit métal le long de la paroi 12 vers le laitier.The wall 12 is relatively high compared to the dimensions of the melts to allow the accumulation of metal from the pocket, the degradation of its energy, and the rise of said metal along from wall 12 to the slag.

Du fait de sa hauteur, la paroi 12 évite que des filets de métal liquide aillent directement en direction des trous de coulée. De plus, la paroi permet d'allonger le temps de séjour du métal dans le réservoir d'alimentation.Due to its height, the wall 12 prevents metal nets liquids go directly towards the tap holes. In addition, the wall makes it possible to extend the residence time of the metal in the tank feed.

Dans l'exemple de la figure 2, le fond 11 de la cavité 9 a, de préférence, lorsque le tampon est parallélépidèdique, la forme d'une pyramide, associé à quatre parois latérales sensiblement planes et verticales. Sous cette forme, le tampon génère entre le fond et les parois, quatre zones de dégradation forte d'énergie du jet d'acier liquide entrant.In the example of FIG. 2, the bottom 11 of the cavity 9a, of preferably, when the buffer is rectangular, the shape of a pyramid, associated with four substantially flat side walls and vertical. In this form, the buffer generates between the bottom and the walls, four zones of strong energy degradation of the liquid steel jet entering.

Le fond 11 de la cavité 9 a, de préférence, lorsque le tampon est cylindrique, la forme d'un cône, associé à une paroi latérale sensiblement cylindrique et verticale. Sous cette forme, le tampon génère entre le fond et la paroi, une couronne de dégradation forte d'énergie du jet d'acier liquide entrant.The bottom 11 of the cavity 9 preferably has when the pad is cylindrical, the shape of a cone, associated with a side wall substantially cylindrical and vertical. In this form, the stamp generates between the bottom and the wall, a strong crown of degradation energy of the incoming liquid steel jet.

Dans les exemples décrits, la surface du fond définit un sommet qui peut être placé soit dans l'axe vertical du jet, soit légèrement déplacé par rapport à l'axe du jet. Le déplacement du tampon peut générer un mouvement rotatif du flux de l'acier, le mouvement rotatif participant à la dégradation de l'énergie du jet d'acier entrant.In the examples described, the bottom surface defines a vertex which can be placed either in the vertical axis of the jet, or slightly moved relative to the axis of the jet. Moving the tampon can generate a rotary movement of the steel flow, the rotary movement participating in the degradation of the energy of the incoming steel jet.

Dans tous les cas, la surface du fond définit un sommet dont la hauteur reste très inférieure à la hauteur de la paroi 12. In all cases, the bottom surface defines a vertex whose height remains much less than the height of wall 12.

Le tampon 8 comporte, percé dans la paroi 12, au moins un trou de vidange 16 assurant d'une part, un écoulement d'acier dans le fond 5 du réservoir, notamment, avant le débordement de l'acier remplissant le tampon, et d'autre part, une vidange de la cavité 9 dudit tampon en fin de coulée.The pad 8 comprises, drilled in the wall 12, at least one hole drain 16 ensuring on the one hand, a flow of steel in the bottom 5 of the tank, in particular, before the filling steel overflows the tampon, and on the other hand, emptying of the cavity 9 of said tampon in end of casting.

Dans une autre forme de l'invention, comme représenté sur la figure 3, la paroi 12 interne de la cavité 9 comporte au moins un bourrelet 13 périphérique situé dans un plan sensiblement horizontal et refermant tout ou une partie de la cavité. En d'autres termes, le bourrelet 13 peut être aménagé sur la surface de la paroi 12 à une hauteur quelconque par rapport au fond de tampon 11, par exemple à mi hauteur de la paroi 12, séparant ainsi la cavité en deux parties.In another form of the invention, as shown in the FIG. 3, the internal wall 12 of the cavity 9 comprises at least one peripheral bead 13 located in a substantially horizontal plane and closing all or part of the cavity. In other words, the bead 13 can be arranged on the surface of wall 12 at a any height relative to the buffer base 11, for example at mid height of the wall 12, thus separating the cavity into two parts.

L'espace de la cavité réduit localement, par exemple, en sortie de la cavité ramène, après l'impact du jet, le flux d'acier vers l'axe du jet d'acier ce qui accentue l'effet de dégradation de l'énergie.The space of the cavity locally reduced, for example, at the outlet of the cavity brings back, after the impact of the jet, the steel flow towards the axis of the jet steel which accentuates the energy degradation effect.

Dans une autre forme de l'invention, comme représenté sur la figure 4, le bourrelet 13 périphérique comporte au moins une partie rabattue 14 vers le fond de tampon 11. Dans cet exemple, le flux est rabattu vers le fond de la cavité pour accentuer la dégradation de l'énergie.In another form of the invention, as shown in the Figure 4, the peripheral bead 13 comprises at least one part folded back 14 towards the buffer base 11. In this example, the flow is folded down towards the bottom of the cavity to accentuate the degradation of energy.

Comme représenté sur la figure 5, de préférence, en fonction de la hauteur du tampon, la paroi interne de la cavité comporte une série de bourrelets 15 périphériques situés dans un plan sensiblement horizontal, définissant une paroi interne ondulée. Les ondulations réduisent, avec l'inclinaison du fond de forme convexe, l'angle de dégradation forte de l'énergie du flux d'acier liquide aussi bien lorsque le métal s'accumule dans le fond du tampon que lorsque celui-ci remonte sur la paroi, après l'impact du jet d'acier fondu sur le fond 11.As shown in Figure 5, preferably depending on the height of the tampon, the internal wall of the cavity comprises a series of peripheral beads 15 located in a substantially horizontal plane, defining a corrugated inner wall. Ripples reduce, with the inclination of the convex bottom, the sharp degradation angle of the energy of the liquid steel flow as well when the metal builds up in the bottom of the pad only when it rises on the wall, after the impact of the molten steel jet on the bottom 11.

Dans le cas d'un tampon comportant un ou des bourrelets, lesdits bourrelets peuvent être réalisés sous forme de pièces indépendantes, comme par exemples des couronnes s'adaptant sur la paroi 12. En effet le moulage en un bloc de pièces comportant un espace fermé générant par exemple des contre dépouilles est difficilement réalisable.In the case of a tampon comprising one or more beads, said beads can be produced in the form of independent pieces, as for example crowns fitting on the wall 12. Indeed molding into a block of parts comprising a closed space generating for example undercuts is difficult to achieve.

Le réservoir proposé muni du tampon selon l'invention, optimise la réduction de la turbulence de l'acier liquide dans la zone d'impact du réservoir grâce à la création de zones de fortes dégradation d'énergie. Il optimise également les temps de court circuit et les temps de séjour, ce qui améliore l'état de propreté de l'acier élaboré. The proposed reservoir provided with the buffer according to the invention optimizes the reduction of the turbulence of the liquid steel in the impact zone of the reservoir through the creation of areas of high energy degradation. he also optimizes short circuit times and residence times, which which improves the cleanliness of the steel produced.

La réserve de réfractaire que constitue le fond de la cavité allonge la durée de vie du tampon.The refractory reserve formed by the bottom of the elongated cavity the life of the pad.

De plus le tampon selon l'invention favorise les écoulements piston et réduit la durée de transition, c'est à dire le temps nécessaire pour passer de la coulée d'une nuance A à la coulée d'une nuance B, ou encore, le temps pendant lequel le réservoir contient la fin de la coulée de la nuance A et le début de la coulée de la nuance B.In addition, the tampon according to the invention promotes flow. piston and reduces the transition time, i.e. the time required to switch from casting a shade A to casting a shade B, or again, the time during which the tank contains the end of the pouring of grade A and the start of casting of grade B.

Un tel tampon, de réalisation aisée, peut être introduit seul dans le réservoir, ce qui permet de s'affranchir de l'utilisation d'habillages annexes tels que les barrages, les déversoirs.Such a pad, easy to make, can be inserted alone in the tank, which eliminates the use of skins annexes such as dams, weirs.

Claims (8)

Réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier, réservoir comprenant un fond réfractaire, des cloisons réfractaires, au moins une busette, ménagée dans le fond réfractaire pour évacuer par écoulement le métal fondu du réservoir, un tampon réfractaire, comportant une cavité, placé sur le fond du réservoir et destiné à recevoir un jet de métal fondu en provenance d'une poche déplacée au-dessus dudit réservoir, caractérisé en ce que la cavité du tampon est formée d'un fond de tampon et d'une paroi sensiblement verticale, la surface du fond de tampon définissant un volume convexe.Feed tank for retaining molten metal and in particular a steel, tank comprising a refractory bottom, refractory partitions, at least one nozzle, formed in the bottom refractory to drain the molten metal from the tank, a refractory pad, comprising a cavity, placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank, characterized in that the cavity of the pad is formed by a pad bottom and a substantially wall vertical, the surface of the buffer base defining a convex volume. Réservoir selon la revendication 1, caractérisé en ce que la surface du fond de tampon définit un volume convexe comportant un sommet situé sensiblement dans l'axe du jet de métal fondu.Tank according to claim 1, characterized in that the surface of the buffer base defines a convex volume comprising a vertex situated substantially in the axis of the jet of molten metal. Réservoir selon les revendications 1 et 2, caractérisé en ce que la surface du fond de tampon définit une pyramide.Tank according to claims 1 and 2, characterized in that the surface of the buffer base defines a pyramid. Réservoir selon les revendications 1 à 3, caractérisé en ce que la surface du fond de tampon définit un cône.Tank according to claims 1 to 3, characterized in that the surface of the buffer base defines a cone. Réservoir selon les revendications 1 à 4, caractérisé en ce que le tampon comporte au moins un trou de vidange.Tank according to claims 1 to 4, characterized in that the tampon has at least one drain hole. Réservoir selon les revendications 1 à 5, caractérisé en ce que la paroi interne de la cavité comporte au moins un bourrelet périphérique situé dans un plan sensiblement horizontal.Tank according to claims 1 to 5, characterized in that the internal wall of the cavity comprises at least one peripheral bead located in a substantially horizontal plane. Réservoir selon la revendication 6, caractérisé en ce que le bourrelet périphérique comporte au moins une partie rabattue vers le fond de tampon.Tank according to claim 6, characterized in that the peripheral bead has at least one part folded towards the stamp background. Réservoir selon les revendications 1 à 6, caractérisé en ce que la paroi interne de la cavité comporte une série de bourrelets périphériques situés dans un plan sensiblement horizontal et définissant une paroi interne ondulée.Tank according to claims 1 to 6, characterized in that the internal wall of the cavity has a series of beads peripherals located in a substantially horizontal plane and defining a corrugated inner wall.
EP97402668A 1996-12-11 1997-11-07 Reservoir for supplying a liquid metal, especially a liquid steel Withdrawn EP0847821A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9615194A FR2756762B1 (en) 1996-12-11 1996-12-11 SUPPLY TANK INTENDED TO RETAIN MELTED METAL AND IN PARTICULAR STEEL
FR9615194 1996-12-11

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EP (1) EP0847821A1 (en)
JP (1) JPH10175046A (en)
KR (1) KR19980064013A (en)
CN (1) CN1067610C (en)
AU (1) AU4541197A (en)
BR (1) BR9705611A (en)
CA (1) CA2217434A1 (en)
FR (1) FR2756762B1 (en)
ID (1) ID18867A (en)
TW (1) TW429179B (en)
ZA (1) ZA9710810B (en)

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US20150273579A1 (en) * 2014-03-28 2015-10-01 Arcelormittal Investigacion Y Desarrollo, S.L. Impact pad, tundish and apparatus including the impact pad, and method of using same
CN107073574A (en) * 2014-08-15 2017-08-18 安赛乐米塔尔研究与发展有限责任公司 Impact pad includes the cast disk and equipment and its application method of impact pad
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MX9709533A (en) 1998-12-31
TW429179B (en) 2001-04-11
ZA9710810B (en) 1998-06-12
FR2756762B1 (en) 1998-12-31
KR19980064013A (en) 1998-10-07
FR2756762A1 (en) 1998-06-12
ID18867A (en) 1998-05-14
CN1067610C (en) 2001-06-27
CN1190039A (en) 1998-08-12
JPH10175046A (en) 1998-06-30
BR9705611A (en) 1999-03-09
CA2217434A1 (en) 1998-06-11
AU4541197A (en) 1998-06-18

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