EP1521650B1 - Lateral face of an installation used for the twin-roll continuous casting of metal bands - Google Patents

Lateral face of an installation used for the twin-roll continuous casting of metal bands Download PDF

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Publication number
EP1521650B1
EP1521650B1 EP03750805A EP03750805A EP1521650B1 EP 1521650 B1 EP1521650 B1 EP 1521650B1 EP 03750805 A EP03750805 A EP 03750805A EP 03750805 A EP03750805 A EP 03750805A EP 1521650 B1 EP1521650 B1 EP 1521650B1
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EP
European Patent Office
Prior art keywords
lining
recess
insert
side wall
front face
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.)
Expired - Lifetime
Application number
EP03750805A
Other languages
German (de)
French (fr)
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EP1521650A2 (en
Inventor
Jean-Michel Damasse
Pietro Tolve
Romeo Capotosti
Philippe Guillo
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.)
Primetals Technologies Austria GmbH
Outokumpu Nirosta GmbH
ArcelorMittal France SA
Original Assignee
Voest Alpine Industrienlagenbau GmbH
ThyssenKrupp Nirosta GmbH
Arcelor France SA
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Application filed by Voest Alpine Industrienlagenbau GmbH, ThyssenKrupp Nirosta GmbH, Arcelor France SA filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1521650A2 publication Critical patent/EP1521650A2/en
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Publication of EP1521650B1 publication Critical patent/EP1521650B1/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
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
    • 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
    • B22D41/02—Linings

Definitions

  • the invention relates to the continuous casting of metals. It relates more particularly to continuous casting installations of thin metal strips of the type called "cast between rolls", and more precisely their refractory side faces which close off the casting space.
  • the casting of metal thin strips of a few mm thick directly from liquid metal can take place on a so-called “casting between cylinders", fed liquid metal from a distributor by means of a casting nozzle.
  • the machine comprises an ingot mold whose casting space is delimited on its long sides by a pair of cylinders cooled internally with parallel horizontal axes and rotating around these axes in opposite directions, and on its short sides by closing plates (called side faces) of refractory material, applied against the flat ends of the rolls.
  • the solidification of the liquid metal must occur only on the cooled cylindrical surfaces of the rolls, by forming solidified skins that are joined at the neck (the area where the gap between the roll surfaces is minimal) to form the strip, which is extracted continuously from the casting space.
  • Another method is to provide a permanent heating of the side faces during casting, by means of burners or induction furnaces, or even induction heating of the metal in their vicinity.
  • burners or induction furnaces or even induction heating of the metal in their vicinity.
  • Another method is to play on the composition of the refractories of the side face, placing facing the casting space fibrous refractories based on silica, alumina or other oxides, having strong insulating properties.
  • These refractories highly insulating, can extract the liquid metal only a relatively small amount of heat and thus limit the risk of parasitic solidification.
  • Their hardness is however low, and they therefore poorly support the friction against the cylinders, and also against the solidified metal or being solidified in the vicinity of the neck.
  • the insulating refractory insitu is replaced inserts made in a material with a lower insulating power but a greater hardness: various ceramics, boron nitride, SiAION ® ...
  • the object of the invention is to provide a lateral side design of a thin strip casting between two cylinders to limit, better than existing designs, the appearance of parasitic solidifications.
  • the front face facing the casting space of said lining may be set back relative to the front face of the insert over its entire height.
  • the lining has a constant thickness
  • the lining has an increasing thickness to a level where said thickness is equal to that of the insert.
  • Said level where said thickness is equal to that of the insert may be the lower edge of the recess.
  • the lining may have an increasing thickness from the upper edge of the recess to the lower edge of the recess.
  • the distance is preferably 5mm or more.
  • the lateral face may comprise an appendix on the width of the front face of the lining, said appendix being intended to overhang the surface of the liquid metal present in the casting space.
  • the invention essentially consists in placing the front surface of the insulating refractory lining of the lateral face substantially recessed with respect to the front surface of the hard refractory portion, and this on at least the largest part of the height of the lining.
  • FIG 1a which schematically represents the front face of a first variant of side face 1 according to the invention, the dimensions are not to scale, for the sake of clarity of the illustration of the principle of the invention.
  • the diameters of the rotating cylinders, whose contours 2, 2 'of the external surfaces, when the lateral face 1 is in the working position, are represented in dashed lines range from 500 to 1500mm, while at level 3 where the neck is located, the width of the space separating the external surfaces of the rolls is equal to the thickness of the cast strip, namely a few mm, at most 10mm.
  • liquid metal is therefore likely to be on a height "h" between the nominal level 4 of the liquid metal surface and the level 3 of the neck.
  • the front surfaces of the insert 9 and the lining 11 are in the exact extension of one another. But according to the invention, the front surface 12 of the lining 11 is substantially set back a maximum distance "d" with respect to the front surface 13 of the insert 9.
  • the lining 11 On a height "h 1 " from the upper edge of the recess 7, the lining 11 has a substantially constant thickness "e". This causes the front surface 12 of the lining 11 is set back a distance equal to "d” over the entire height "h 1 ". Then on a height “h 2 ", this thickness increases gradually so that at the lower edge 14 of the recess 7, this thickness is found to be equal to that of the insert 9, as is visible on the Fig.1C . In this figure, there is shown a linear growth of this thickness, giving a flat shape to the front surface 12 of the lining 11 in the area. But other variants are possible, for example a growth of the thickness of the lining 11 which would give a curved shape to the front surface 12.
  • the presence of a portion of height "h 2 " on which the thickness of the lining increases to become substantially equal to that of the insert 13 is, if not completely essential, at least very advisable. Otherwise, the insert 9 provides a sharp angle to the liquid metal, and there is a risk of rapid erosion of the upper part of the insert 9 in the area 10 surrounding the neck, which would be unfavorable to the regularity of the conditions of casting and solidification of the band.
  • the distance "d” is of the order of at least 10 mm and can reach several tens of mm, even a few hundred mm (for example 250 mm), preferably 80 to 150 mm.
  • "H 2 " is typically (but not exclusively) of the order of 1.5 xd, so as to impose on the front surface 12 packing 11 in the area considered an average inclination of approximately 45 ° relative to the vertical.
  • the thickness of the lining 11 increases from the upper edge of the recess 7, ie "h 1 " is equal to 0.
  • the lateral face 1 has the following advantages.
  • the parasitic solidifications that may occur on the lining 11 are carried far back from the lower part of the casting space. If the resulting solid metal is driven into the bottom of the casting space, it has more time to recast than in the prior art. This significantly reduces the risk of casting incidents related to the passage of unwanted solid metal at level 3 of the neck.
  • the casting space has a width no longer substantially equal to that of the cast strip, but greater by a value equal to twice ".
  • This upper surface of the liquid metal therefore has a greater area than is usually encountered for a given width of the cast strip.
  • the impurities non-metallic inclusions, refractory particles torn off from the lateral faces, etc.
  • they have the possibility of being housed in the vicinity of the side faces 1, in areas of width "d" which are not in the vertical of the band during solidification. They are then relatively unlikely to be re-trained by the liquid metal currents to end up in the solidified band.
  • This collection of impurities in the vicinity of the side faces 1 can be promoted by a printed form to the flows in the casting space by means of a casting nozzle designed accordingly.
  • this cold metal is relatively far from the solidification zone of the strip. It therefore does not come directly form the solidified strip, and before reaching the solidification zone facing the rolls, it has the possibility of being heated by the liquid metal that has not been in contact With the side faces 1. Thus, especially at the beginning of casting, a better regularity of the thermal conditions in the casting space is obtained.
  • the increase in the area of the upper surface of the liquid metal caused by the use of a side face 1 according to the invention results in a possible increase in the thermal losses by radiation of the liquid metal in the space of casting. But this disadvantage is minimal if, as is almost always the case, we cover the casting space by a cover that returns the radiation on the metal.
  • the lining 11 has on the width of its front face 12 a substantially horizontal appendage 15 placed just above the maximum level 4 of the liquid metal, so as to overhang an equal distance, for example, "d”.
  • This appendix 15 can, moreover, be used to make the hood rest, as described in the document EP-A-0 875 315 in the case of conventional side faces. In the example shown, the appendix 15 is located at the upper edge of the lining 11. But it could equally well be located a little lower, the essential being that it is always above the surface of the metal liquid in the casting space, so as to return the radiation it receives.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a side wall ( 1 ) of a plant for the continuous casting of metal strip ( 5 ) between two counter-rotating rolls ( 2, 2 ') having horizontal axes and being internally cooled, the surfaces of which define a casting space confined laterally by two side walls ( 1 ) made of refractory, of the type comprising: a support plate ( 6 ) on the front face of which a recess ( 7 ) is made; an insert ( 9 ) made of hard material placed around the periphery of the recess ( 7 ); a lining ( 11 ) that fills the remainder of the recess ( 7 ); characterized in that the front face ( 12 ), turned towards the casting space, of the said lining ( 11 ) is set back by a maximum distance (d) from the front face ( 13 ) of the insert ( 9 ) over at least part of its length.

Description

L'invention concerne la coulée continue des métaux. Elle concerne plus particulièrement les installations de coulée continue de bandes minces métalliques du type appelé « coulées entre cylindres », et plus précisément leurs faces latérales en réfractaire qui obturent l'espace de coulée.The invention relates to the continuous casting of metals. It relates more particularly to continuous casting installations of thin metal strips of the type called "cast between rolls", and more precisely their refractory side faces which close off the casting space.

La coulée de bandes minces métalliques de quelques mm d'épaisseur directement à partir de métal liquide (acier ou cuivre, par exemple) peut avoir lieu sur une installation dite de « coulée entre cylindres », alimentée en métal liquide à partir d'un répartiteur au moyen d'une busette de coulée. La machine comporte une lingotière dont l'espace de coulée est délimité sur ses grands côtés par une paire de cylindres refroidis intérieurement à axes horizontaux parallèles et tournant autour de ces axes en sens inverses, et sur ses petits côtés par des plaques de fermeture (appelées faces latérales) en matériau réfractaire, appliquées contre les extrémités planes des cylindres. La solidification du métal liquide doit se produire uniquement sur les surfaces cylindriques refroidies des cylindres, par formation de peaux solidifiées que l'on fait se rejoindre au niveau du col (la zone où l'écart entre les surfaces des cylindres est minimal) pour former la bande, qui est extraite continûment de l'espace de coulée.The casting of metal thin strips of a few mm thick directly from liquid metal (steel or copper, for example) can take place on a so-called "casting between cylinders", fed liquid metal from a distributor by means of a casting nozzle. The machine comprises an ingot mold whose casting space is delimited on its long sides by a pair of cylinders cooled internally with parallel horizontal axes and rotating around these axes in opposite directions, and on its short sides by closing plates (called side faces) of refractory material, applied against the flat ends of the rolls. The solidification of the liquid metal must occur only on the cooled cylindrical surfaces of the rolls, by forming solidified skins that are joined at the neck (the area where the gap between the roll surfaces is minimal) to form the strip, which is extracted continuously from the casting space.

Dans la pratique, il est cependant difficile d'éviter en permanence l'apparition des solidifications dites « solidifications parasites », c'est à dire de couches de métal solidifiées qui prennent naissance sur certaines zones des faces latérales. Elles sont dues au fait que le métal liquide avoisinant ces zones peut se trouver à une température sensiblement inférieure à sa température nominale et être donc susceptible de se solidifier localement au contact des faces latérales. Cette basse température peut être due à des conditions hydrodynamiques défavorables qui ne permettent pas un renouvellement suffisant du métal liquide dans ces zones, ou à une température insuffisante des faces latérales due à un mauvais préchauffage avant la coulée. Bien entendu, plusieurs de ces facteurs peuvent se conjuguer. Lorsque le métal solide résultant de ces solidifications parasites est entraîné dans le bas de l'espace de coulée, il doit passer entre les cylindres en créant une épaisseur de métal qui s'ajoute à l'épaisseur normale du produit. Il s'ensuit que les cylindres doivent momentanément absorber un effort supplémentaire qui les oblige à s'écarter temporairement l'un de l'autre pour éviter leur détérioration. La qualité de la bande en est défavorablement affectée. On peut aussi assister à un recul de la face latérale, avec les risques de perte de l'étanchéité de l'espace de coulée qui lui sont associés.In practice, however, it is difficult to permanently avoid the appearance of so-called "parasitic solidification" solidifications, that is to say of solidified metal layers that originate on certain areas of the lateral faces. They are due to the fact that the liquid metal surrounding these zones may be at a temperature substantially below its nominal temperature and may therefore be able to solidify locally in contact with the lateral faces. This low temperature may be due to unfavorable hydrodynamic conditions which do not allow a sufficient renewal of the liquid metal in these areas, or at an insufficient temperature of the side faces due to poor preheating before casting. Of course, many of these factors can be combined. When the solid metal resulting from these parasitic solidifications is entrained in the bottom of the casting space, it must pass between the cylinders creating a thickness of metal that adds to the normal thickness of the product. It follows that the cylinders must momentarily absorb an additional effort which forces them to temporarily move away from each other to prevent their deterioration. The quality of the band is adversely affected. We can also witness a decline in side face, with the risk of loss of sealing of the casting space associated with it.

Habituellement, on essaye de limiter l'apparition des solidifications parasites en adoptant des configurations de busette de coulée particulières. Elles visent à imposer au métal liquide se trouvant dans l'espace de coulée des conditions d'écoulement censées assurer un renouvellement permanent du métal face aux zones où les solidifications parasites sont les plus susceptibles de se produire, par exemple en amenant du métal liquide sortant de la busette directement à proximité de ces zones. Cela peut cependant conduire à un déficit d'alimentation en métal liquide en d'autres parties de l'espace de coulée.Usually, attempts are made to limit the occurrence of parasitic solidifications by adopting particular casting nozzle configurations. They are aimed at imposing on the liquid metal in the casting space flow conditions intended to ensure a permanent renewal of the metal in the zones where the parasitic solidifications are most likely to occur, for example by bringing out liquid metal. from the nozzle directly to these areas. However, this can lead to a lack of supply of liquid metal in other parts of the casting space.

Une autre méthode consiste à prévoir un réchauffage permanent des faces latérales pendant la coulée, au moyen de brûleurs ou de fours à induction, voire également un réchauffage par induction du métal se trouvant dans leur voisinage. Cela entraîne cependant des complications dans la construction de la face latérale et dans la gestion de son fonctionnement.Another method is to provide a permanent heating of the side faces during casting, by means of burners or induction furnaces, or even induction heating of the metal in their vicinity. However, this leads to complications in the construction of the lateral face and in the management of its operation.

Une autre méthode consiste à jouer sur la composition des réfractaires de la face latérale, en plaçant face à l'espace de coulée des réfractaires fibreux à base de silice, d'alumine ou d'autres oxydes, présentant de fortes propriétés isolantes. Ces réfractaires, fortement isolants, peuvent n'extraire du métal liquide qu'une relativement faible quantité de chaleur et limitent ainsi le risque de solidifications parasites. Leur dureté est cependant faible, et ils supportent donc mal le frottement contre les cylindres, et aussi contre le métal solidifié ou en cours de solidification se trouvant au voisinage du col. C'est pourquoi dans les zones de la face latérale qui encadrent leurs arcs de contact avec les bords des cylindres et dans les zones qui font face à la partie inférieure de l'espace de coulée, on substitue au réfractaire isolant précité des inserts réalisés en un matériau présentant un moins bon pouvoir isolant mais une plus grande dureté : céramiques diverses, nitrure de bore, SiAION® ...Another method is to play on the composition of the refractories of the side face, placing facing the casting space fibrous refractories based on silica, alumina or other oxides, having strong insulating properties. These refractories, highly insulating, can extract the liquid metal only a relatively small amount of heat and thus limit the risk of parasitic solidification. Their hardness is however low, and they therefore poorly support the friction against the cylinders, and also against the solidified metal or being solidified in the vicinity of the neck. This is why in the zones of the lateral face which frame their arcs of contact with the edges of the cylinders and in the zones which face the lower part of the casting space, the insulating refractory insitu is replaced inserts made in a material with a lower insulating power but a greater hardness: various ceramics, boron nitride, SiAION ® ...

Cette solution n'est cependant pas entièrement satisfaisante, car des transferts thermiques entre le réfractaire dur et le réfractaire isolant se produisent dans leur zone de contact, ce qui conduit à un refroidissement localisé du réfractaire isolant. Cela peut suffire à initier des solidifications parasites.This solution is not entirely satisfactory, however, since heat transfer between the hard refractory and the insulating refractory occurs in their contact zone, which leads to localized cooling of the insulating refractory. This can be enough to initiate parasitic solidifications.

Le but de l'invention est de proposer une conception de faces latérales d'une coulée de bandes minces entre deux cylindres permettant de limiter, mieux que les conceptions existantes, l'apparition de solidifications parasites.The object of the invention is to provide a lateral side design of a thin strip casting between two cylinders to limit, better than existing designs, the appearance of parasitic solidifications.

A cet effet, l'invention a pour objet une face latérale pour installation de coulée continue de bandes métalliques entre deux cylindres contrarotatifs à axes horizontaux, refroidis intérieurement, dont les surfaces délimitent un espace de coulée obturé latéralement par deux faces latérales en matériau réfractaire, du type comportant :

  • une plaque support sur la face avant de laquelle est ménagé un évidement ;
  • un insert en matériau dur disposé à la périphérie de l'évidement ;
  • un garnissage remplissant le restant de l'évidement ;
caractérisée en ce que la face frontale tournée vers l'espace de coulée dudit garnissage, est en retrait d'une distance maximale par rapport à la face frontale de l'insert sur au moins une partie de sa hauteur.For this purpose, the subject of the invention is a lateral face for a continuous casting installation of metal strips between two counter-rotating cylinders at horizontal axes, internally cooled, the surfaces of which delimit a casting space closed laterally by two lateral faces of refractory material, of the type comprising:
  • a support plate on the front side of which is formed a recess;
  • an insert of hard material disposed at the periphery of the recess;
  • a filling filling the remainder of the recess;
characterized in that the end face facing the casting space of said lining is set back a maximum distance from the front face of the insert over at least a portion of its height.

La face frontale tournée vers l'espace de coulée dudit garnissage peut être en retrait par rapport à la face frontale de l'insert sur la totalité de sa hauteur.The front face facing the casting space of said lining may be set back relative to the front face of the insert over its entire height.

Préférentiellement, sur une hauteur « h1» à partir du bord supérieur de l'évidemment, le garnissage présente une épaisseur constante, et sur une hauteur « h2», le garnissage présente une épaisseur croissante jusqu'à un niveau où ladite épaisseur est égale à celle de l'insert.Preferably, on a height "h 1 " from the upper edge of the recess, the lining has a constant thickness, and on a height "h 2 ", the lining has an increasing thickness to a level where said thickness is equal to that of the insert.

Ledit niveau où ladite épaisseur est égale à celle de l'insert peut être le bord inférieur de l'évidement.Said level where said thickness is equal to that of the insert may be the lower edge of the recess.

En variante, le garnissage peut présenter une épaisseur croissante depuis le bord supérieur de l'évidement jusqu'au bord inférieur de l'évidement.Alternatively, the lining may have an increasing thickness from the upper edge of the recess to the lower edge of the recess.

La distance est de préférence égale à 5mm ou davantage.The distance is preferably 5mm or more.

La face latérale peut comporter un appendice sur la largeur de la face frontale du garnissage, ledit appendice étant destiné à surplomber la surface du métal liquide présent dans l'espace de coulée.The lateral face may comprise an appendix on the width of the front face of the lining, said appendix being intended to overhang the surface of the liquid metal present in the casting space.

Comme on l'aura compris, l'invention consiste essentiellement à placer la surface frontale du garnissage en réfractaire isolant de la face latérale sensiblement en retrait par rapport à la surface frontale de la partie en réfractaire dur, et ce sur au moins la plus grande partie de la hauteur du garnissage.As will be understood, the invention essentially consists in placing the front surface of the insulating refractory lining of the lateral face substantially recessed with respect to the front surface of the hard refractory portion, and this on at least the largest part of the height of the lining.

L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées suivantes :

  • la figure 1a qui montre en vue de face une première variante d'une face latérale de coulée continue entre cylindres selon l'invention ;
  • la figure 1b qui représente vu en section selon Ib-Ib un détail de cette face latérale ;
  • la figure 1c qui représente en section selon Ic-Ic un autre détail de cette face latérale ;
  • la figure 1d qui représente en section selon Id-Id un autre détail de cette face latérale ;
  • les figures 2a à 2d qui représentent de la même façon une deuxième variante d'une face latérale selon l'invention.
The invention will be better understood on reading the description which follows, given with reference to the following appended figures:
  • the figure 1a which shows in front view a first variant of a continuous side casting side between cylinders according to the invention;
  • the figure 1b which represents in section according to Ib-Ib a detail of this lateral face;
  • the figure 1c which represents in section according to Ic-Ic another detail of this lateral face;
  • the figure 1d which represents in section according to Id-Id another detail of this lateral face;
  • the Figures 2a to 2d which represent in the same way a second variant of a side face according to the invention.

Sur la figure 1a, qui représente schématiquement la face avant d'une première variante de face latérale 1 selon l'invention, les dimensions ne sont pas à l'échelle, pour des raisons de clarté de l'illustration du principe de l'invention. Il faut savoir que sur les installations susceptibles d'être utilisées industriellement pour la coulée de l'acier, les diamètres des cylindres en rotation, dont les contours 2, 2' des surfaces externes, lorsque la face latérale 1 est en position de travail, sont représentés en traits interrompus, vont de 500 à 1500mm, alors qu'au niveau 3 où se situe le col, la largeur de l'espace qui sépare les surfaces externes des cylindres est égale à l'épaisseur de la bande coulée, à savoir quelques mm, au plus 10mm. On a également représenté en pointillés le niveau nominal 4 atteint par la surface du métal liquide présent dans l'espace de coulée, et aussi les contours 5 de la bande solidifiée qui, est extraite de l'installation. Dans l'espace de coulée, du métal liquide est donc susceptible de se trouver sur une hauteur « h » comprise entre le niveau nominal 4 de la surface du métal liquide et le niveau 3 du col.On the figure 1a , which schematically represents the front face of a first variant of side face 1 according to the invention, the dimensions are not to scale, for the sake of clarity of the illustration of the principle of the invention. It should be known that on the installations that can be used industrially for the casting of steel, the diameters of the rotating cylinders, whose contours 2, 2 'of the external surfaces, when the lateral face 1 is in the working position, are represented in dashed lines, range from 500 to 1500mm, while at level 3 where the neck is located, the width of the space separating the external surfaces of the rolls is equal to the thickness of the cast strip, namely a few mm, at most 10mm. Dotted also is the nominal level 4 reached by the surface of the liquid metal present in the casting space, and also the contours 5 of the solidified strip which is extracted from the installation. In the casting space, liquid metal is therefore likely to be on a height "h" between the nominal level 4 of the liquid metal surface and the level 3 of the neck.

La face latérale 1 se compose des éléments suivants :

  • une plaque support 6 en matériau réfractaire à fortes propriétés isolantes ; sur sa face avant est ménagé un évidement 7 ; sur sa face arrière, dans l'exemple représenté, elle est supportée par une plaque 8 sur la face arrière de laquelle agissent les organes (non représentés) qui appliquent la face latérale 1 contre les extrémités des cylindres 2 ;
  • une pièce 9 (qui peut être en une ou plusieurs parties), appelée « insert » disposée à la périphérie de l'évidement 7 (sauf sur le bord supérieur de l'évidement 7) ; elle fait face aux zones entourant les bords des cylindres et à la zone 10 entourant le col ; de manière générale, cet insert 9 doit faire face à toutes les parties de la face latérale 1 qui sont appelées à être au contact des bords des cylindres et des peaux solidifiées dans des zones où une étanchéité de l'espace de coulée est indispensable ; pour que cette étanchéité soit réalisée en permanence, malgré les frottements auxquels est soumis l'insert 9, il faut réaliser cet insert 9 en un matériau réfractaire dur présentant une forte résistancé à l'usure mécanique et à la corrosion par le métal coulé, tel que du SiAION® ou du BN, même si sa compacité élevée doit lui conférer des propriétés isolantes relativement médiocres ;
  • un garnissage 11 qui remplit le reste du fond de l'évidement 7, et assure donc l'essentiel des contacts entre la face latérale 1 et le métal liquide ; ce garnissage 11 est en un matériau réfractaire à hautes propriétés isolantes, tel que la mousse de silice, de la silice fibreuse, de l'alumine fibreuse, de la zircone sous forme coulée... et peut présenter des propriétés mécaniques et chimiques moins élevées que celles de l'insert 9. L'insert 9 et le garnissage 11 constituent ce qu'on peut appeler la « partie active » de la face latérale 1, en ce qu'ils assurent le confinement du métal liquide entre les cylindres et l'essentiel de l'étanchéité de l'espace de coulée.
The lateral face 1 consists of the following elements:
  • a support plate 6 of refractory material with strong insulating properties; on its front face is formed a recess 7; on its rear face, in the example shown, it is supported by a plate 8 on the rear side of which act the members (not shown) which apply the side face 1 against the ends of the cylinders 2;
  • a part 9 (which may be in one or more parts), called "insert" disposed at the periphery of the recess 7 (except on the upper edge of the recess 7); it faces the areas surrounding the edges of the rolls and the area surrounding the neck; in general, this insert 9 must face all the parts of the side face 1 which are intended to be in contact with the edges of the rolls and solidified skins in areas where sealing of the casting space is essential; to ensure that this seal is permanently achieved, despite the friction to which the insert 9 is subjected, it is necessary to make this insert 9 of a hard refractory material having a high resistance to mechanical wear and corrosion by the cast metal, such than SiAION ® or BN, although its high compactness must give it relatively poor insulating properties;
  • a lining 11 which fills the remainder of the bottom of the recess 7, and thus ensures most of the contacts between the side face 1 and the liquid metal; this lining 11 is made of a refractory material with high insulating properties, such as silica foam, fibrous silica, fibrous alumina, zirconia in cast form ... and may have lower mechanical and chemical properties than those of the insert 9. The insert 9 and the lining 11 constitute what may be called the "active part" of the lateral face 1, in that they ensure the confinement of the liquid metal between the rolls and the liner. essential of the sealing of the casting space.

Dans les faces latérales connues de l'art antérieur, les surfaces frontales de l'insert 9 et du garnissage 11 sont dans le prolongement exact l'une de l'autre. Mais selon l'invention, la surface frontale 12 du garnissage 11 est sensiblement en retrait d'une distance maximale « d » par rapport à la surface frontale 13 de l'insert 9.In the known side faces of the prior art, the front surfaces of the insert 9 and the lining 11 are in the exact extension of one another. But according to the invention, the front surface 12 of the lining 11 is substantially set back a maximum distance "d" with respect to the front surface 13 of the insert 9.

Sur une hauteur « h1 » à partir du bord supérieur de l'évidement 7, le garnissage 11 a une épaisseur sensiblement constante « e ». Cela entraîne que la surface frontale 12 du garnissage 11 est en retrait d'une distance égale à « d » sur toute cette hauteur « h1 ». Puis sur une hauteur « h2 », cette épaisseur croît progressivement de manière à ce qu'au niveau du bord inférieur 14 de l'évidement 7, cette épaisseur se retrouve égale à celle de l'insert 9, comme cela est visible sur la fig.1c. Sur cette figure, on a représenté une croissance linéaire de cette épaisseur, conférant une forme plane à la surface frontale 12 du garnissage 11 dans la zone considérée. Mais d'autres variantes sont possibles, par exemple une croissance de l'épaisseur du garnissage 11 qui conférerait une forme courbe à la surface frontale 12. En tout cas, la présence d'une portion de hauteur « h2 » sur laquelle l'épaisseur du garnissage croît jusqu'à devenir sensiblement égale à celle de l'insert 13 est, sinon totalement indispensable, du moins très conseillée. Dans le cas contraire, l'insert 9 offre un angle vif au métal liquide, et on risque d'assister à une érosion rapide de la partie supérieure de l'insert 9 dans la zone 10 entourant le col, ce qui serait défavorable à la régularité des conditions de coulée et de solidification de la bande.On a height "h 1 " from the upper edge of the recess 7, the lining 11 has a substantially constant thickness "e". This causes the front surface 12 of the lining 11 is set back a distance equal to "d" over the entire height "h 1 ". Then on a height "h 2 ", this thickness increases gradually so that at the lower edge 14 of the recess 7, this thickness is found to be equal to that of the insert 9, as is visible on the Fig.1C . In this figure, there is shown a linear growth of this thickness, giving a flat shape to the front surface 12 of the lining 11 in the area. But other variants are possible, for example a growth of the thickness of the lining 11 which would give a curved shape to the front surface 12. In any case, the presence of a portion of height "h 2 " on which the thickness of the lining increases to become substantially equal to that of the insert 13 is, if not completely essential, at least very advisable. Otherwise, the insert 9 provides a sharp angle to the liquid metal, and there is a risk of rapid erosion of the upper part of the insert 9 in the area 10 surrounding the neck, which would be unfavorable to the regularity of the conditions of casting and solidification of the band.

La distance « d » est de l'ordre d'au moins 10mm et peut atteindre plusieurs dizaines de mm, voire quelques centaines de mm (par exemple 250 mm), préférentiellement de 80 à 150 mm. « h2 » est typiquement (mais non limitativement) de l'ordre de 1,5 x d, de façon à imposer à la surface frontale 12 du garnissage 11 dans la zone considérée une inclinaison moyenne de 45° approximativement par rapport à la verticale.The distance "d" is of the order of at least 10 mm and can reach several tens of mm, even a few hundred mm (for example 250 mm), preferably 80 to 150 mm. "H 2 " is typically (but not exclusively) of the order of 1.5 xd, so as to impose on the front surface 12 packing 11 in the area considered an average inclination of approximately 45 ° relative to the vertical.

Il demeurerait dans l'esprit de l'invention que l'épaisseur du garnissage 11 augmente dès le bord supérieur de l'évidement 7, autrement dit que « h1 » soit égale à 0.It would remain in the spirit of the invention that the thickness of the lining 11 increases from the upper edge of the recess 7, ie "h 1 " is equal to 0.

Par rapport aux faces latérales de l'art antérieur, la face latérale 1 selon l'invention présente les avantages suivants.With respect to the lateral faces of the prior art, the lateral face 1 according to the invention has the following advantages.

Les solidifications parasites qui pourraient survenir sur le garnissage 11 sont reportées loin en retrait de la partie inférieure de l'espace de coulée. Si le métal solide qui en résulte est entraîné dans le bas de l'espace de coulée, il dispose de plus de temps pour refondre que dans l'art antérieur. Cela permet de réduire sensiblement les risques d'incidents de coulée liés au passage de métal solide indésirable au niveau 3 du col.The parasitic solidifications that may occur on the lining 11 are carried far back from the lower part of the casting space. If the resulting solid metal is driven into the bottom of the casting space, it has more time to recast than in the prior art. This significantly reduces the risk of casting incidents related to the passage of unwanted solid metal at level 3 of the neck.

Au niveau 4 de la surface supérieure du métal liquide se trouvant dans l'espace de coulée, l'espace de coulée présente une largeur non plus sensiblement égale à celle de la bande coulée, mais supérieure d'une valeur égale à deux fois « d ». Cette surface supérieure du métal liquide a donc une aire plus importante que ce qu'on rencontre habituellement pour une largeur donnée de la bande coulée. Cela entraîne que les impuretés (inclusions non-métalliques, particules de réfractaires arrachées aux faces latérales...) qui décantent à partir du métal liquide disposent d'une surface plus grande pour se répartir. En particulier, elles ont la possibilité de venir se loger au voisinage des faces latérales 1, dans des zones de largeur « d » qui ne se trouvent pas à la verticale de la bande en cours de solidification. Elles ont alors relativement peu de chances d'être réentrainées par les courants de métal liquide pour se retrouver, en fin de compte, dans la bande solidifiée. Ce rassemblement des impuretés au voisinage des faces latérales 1 peut être favorisé par une forme imprimée aux écoulements dans l'espace de coulée grâce à une busette de coulée dessinée en conséquence.At level 4 of the upper surface of the liquid metal in the casting space, the casting space has a width no longer substantially equal to that of the cast strip, but greater by a value equal to twice ". This upper surface of the liquid metal therefore has a greater area than is usually encountered for a given width of the cast strip. This results in the impurities (non-metallic inclusions, refractory particles torn off from the lateral faces, etc.) that decant from the liquid metal have a larger surface area to distribute themselves. In particular, they have the possibility of being housed in the vicinity of the side faces 1, in areas of width "d" which are not in the vertical of the band during solidification. They are then relatively unlikely to be re-trained by the liquid metal currents to end up in the solidified band. This collection of impurities in the vicinity of the side faces 1 can be promoted by a printed form to the flows in the casting space by means of a casting nozzle designed accordingly.

Enfin, le métal liquide qui vient en contact avec le garnissage 11 aux stades initiaux de la coulée, lorsque la face latérale 1 n'a pas encore tout à fait atteint sa température définitive, tend à se refroidir plus qu'il n'est souhaitable. Grâce à l'invention, ce métal froid est relativement éloigné de la zone de solidification de la bande. Il ne vient donc pas former directement la bande solidifiée, et avant de parvenir dans la zone de solidification face aux cylindres, il a la possibilité d'être réchauffé par le métal liquide qui n'a pas été en contact avec les faces latérales 1. Ainsi, en particulier en début de coulée, on obtient une meilleure régularité des conditions thermiques dans l'espace de coulée.Finally, the liquid metal which comes into contact with the lining 11 at the initial stages of the casting, when the side face 1 has not quite reached its final temperature, tends to cool more than is desirable. . Thanks to the invention, this cold metal is relatively far from the solidification zone of the strip. It therefore does not come directly form the solidified strip, and before reaching the solidification zone facing the rolls, it has the possibility of being heated by the liquid metal that has not been in contact With the side faces 1. Thus, especially at the beginning of casting, a better regularity of the thermal conditions in the casting space is obtained.

L'accroissement de l'aire de la surface supérieure du métal liquide provoqué par l'utilisation d'une face latérale 1 selon l'invention a pour conséquence un accroissement possible des pertes thermiques par rayonnement du métal liquide se trouvant dans l'espace de coulée. Mais cet inconvénient est minime si, comme c'est pratiquement toujours le cas, on couvre l'espace de coulée par un capot qui renvoie le rayonnement sur le métal. On peut également, comme représenté sur la figure 1, prévoir que le garnissage 11 comporte sur la largeur de sa face frontale 12 un appendice 15 sensiblement horizontal placé juste au dessus du niveau maximal 4 du métal liquide, de manière à la surplomber sur une distance égale, par exemple, à « d ». Cet appendice 15 peut, d'ailleurs, être utilisé pour y faire reposer le capot, comme il est décrit dans le document EP-A-0 875 315 dans le cas de faces latérales classiques. Dans l'exemple représenté, l'appendice 15 est situé au bord supérieur du garnissage 11. Mais il pourrait tout aussi bien être situé un peu plus bas, l'essentiel étant qu'il se trouve toujours au-dessus de la surface du métal liquide présent dans l'espace de coulée, de manière à lui renvoyer le rayonnement qu'il reçoit.The increase in the area of the upper surface of the liquid metal caused by the use of a side face 1 according to the invention results in a possible increase in the thermal losses by radiation of the liquid metal in the space of casting. But this disadvantage is minimal if, as is almost always the case, we cover the casting space by a cover that returns the radiation on the metal. One can also, as represented on the figure 1 , provide that the lining 11 has on the width of its front face 12 a substantially horizontal appendage 15 placed just above the maximum level 4 of the liquid metal, so as to overhang an equal distance, for example, "d". This appendix 15 can, moreover, be used to make the hood rest, as described in the document EP-A-0 875 315 in the case of conventional side faces. In the example shown, the appendix 15 is located at the upper edge of the lining 11. But it could equally well be located a little lower, the essential being that it is always above the surface of the metal liquid in the casting space, so as to return the radiation it receives.

Si on souhaite ne pas avoir une trop brusque variation de la largeur de l'espace de coulée au voisinage du niveau 3 du col, on peut utiliser la variante de l'invention représentée sur les figures 2a-2d (les éléments communs avec la variante de la figure 1 sont repérés par les mêmes références). Dans cette variante, il existe une hauteur h3 située entre le bord inférieur 14 de l'évidement 7 et un niveau 16 situé au dessus dudit bord 14 où les surfaces frontales 12 du garnissage 11 et 13 de l'insert 9 sont alignées. Selon les besoins, cette hauteur h3 peut varier entre quelques mm et quelques cm, en fonction notamment de la possibilité qu'on a d'éviter l'apparition de solidifications parasites dans cette zone grâce, par exemple, à une géométrie adaptée de la busette de coulée.If it is desired not to have a too sudden variation of the width of the casting space in the vicinity of the level 3 of the neck, one can use the variant of the invention shown on the Figures 2a-2d (the elements common with the variant of the figure 1 are identified by the same references). In this variant, there is a height h 3 located between the lower edge 14 of the recess 7 and a level 16 located above said edge 14 where the front surfaces 12 of the lining 11 and 13 of the insert 9 are aligned. Depending on the requirements, this height h 3 may vary between a few mm and a few cm, depending in particular on the possibility of avoiding the appearance of parasitic solidifications in this zone by, for example, a geometry adapted from the casting nozzle.

Comme à propos de la variante précédente, il est envisageable que « h1 » soit égale à 0.As with the previous variant, it is conceivable that "h 1 " is equal to 0.

Claims (8)

  1. Side wall (1) of a plant for the continuous casting of metal strip (5) between two counter-rotating rolls (2, 2') having horizontal axes and bering internally cooled, the surfaces of which define a casting space confined laterally by two side walls (1) made of refractory, of the type comprising:
    - a support plate (6) on the front face of which a recess (7) is made;
    - an insert (9) made of hard maternal placed around the periphery of the recess (7) ;
    - a lining (11) that fills the remainder of the recess (7) ;
    characterized in that the front face (12), turned towards the casting space, of the said lining (11) is set back by a maximum distance (d) from the front face (13) of the insert (9) over at least part of its length.
  2. Side wall (1) according to Claim 1, characterized in that the front face (12), turned towards the casting space, of the said lining (11) is set back from the front face of the insert (9) over its entire length.
  3. Side wall (1) according to Claim 1 or 2, characterized in that over a length (h1), starting from the upper edge of the recess (7), the lining (11) has a constant thickness (e) and in that over a length (h2), the lining (11) has a thickness that increases up to a level where the said thickness is equal to that of the insert (9).
  4. Side wall (1) according to Claim 3, characterized in that the said level where the said thickness is equal to that of the insert (9) is the lower edge (14) of the recess (7).
  5. Side wall (1) according to Claim 1, characterized in that the lining (11) has a thickness that increases from the upper edge of the recess (7) down to the lower edge (14) of the recess (7).
  6. Side wall (1) according to one of Claims 1 to 5, characterized in that the distance (d) is equal to 10 mm or more.
  7. Side wall (1) according to Claim 6, characterized in that the distance (d) is between 80 and 150 mm.
  8. Side wall (1) according to one cf Claims 1 to 7, characterized in that it includes an appendage (15) over the width of the front face (12) of the lining (11), the said appendage (15) being designed to overhang the surface of the liquid metal present in the casting space.
EP03750805A 2002-07-12 2003-07-11 Lateral face of an installation used for the twin-roll continuous casting of metal bands Expired - Lifetime EP1521650B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0208853 2002-07-12
FR0208853A FR2842130B1 (en) 2002-07-12 2002-07-12 SIDE SIDE FOR INSTALLATION OF CONTINUOUS CASTING OF METAL STRIPS BETWEEN TWO CYLINDERS
PCT/FR2003/002221 WO2004007116A2 (en) 2002-07-12 2003-07-11 Lateral face of an installation used for the twin-roll continuous casting of metal bands

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EP1521650A2 EP1521650A2 (en) 2005-04-13
EP1521650B1 true EP1521650B1 (en) 2012-01-25

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EP (1) EP1521650B1 (en)
JP (1) JP4418749B2 (en)
KR (1) KR101069609B1 (en)
CN (1) CN1299856C (en)
AT (1) ATE542621T1 (en)
AU (1) AU2003269022B2 (en)
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US8191610B2 (en) * 2008-11-24 2012-06-05 Nucor Corporation Strip casting apparatus with improved side dam
US7888158B1 (en) * 2009-07-21 2011-02-15 Sears Jr James B System and method for making a photovoltaic unit
JP5837758B2 (en) 2011-04-27 2015-12-24 キャストリップ・リミテッド・ライアビリティ・カンパニー Twin roll casting apparatus and control method thereof
US20140008032A1 (en) * 2012-07-01 2014-01-09 Nucor Corporation Side dam with insert
US10046384B2 (en) 2015-09-30 2018-08-14 Nucor Corporation Side dam with pocket

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CN1299856C (en) 2007-02-14
JP2005536352A (en) 2005-12-02
MXPA05000390A (en) 2005-03-23
WO2004007116A3 (en) 2004-04-08
AU2003269022A1 (en) 2004-02-02
FR2842130A1 (en) 2004-01-16
RU2005103635A (en) 2005-07-27
US20060081352A1 (en) 2006-04-20
ATE542621T1 (en) 2012-02-15
FR2842130B1 (en) 2004-10-15
US7258157B2 (en) 2007-08-21
KR20050045985A (en) 2005-05-17
CN1668404A (en) 2005-09-14
KR101069609B1 (en) 2011-10-05
JP4418749B2 (en) 2010-02-24
AU2003269022B2 (en) 2009-10-01
EP1521650A2 (en) 2005-04-13
WO2004007116A2 (en) 2004-01-22
RU2305611C2 (en) 2007-09-10

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