EP1521650A2 - 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

Info

Publication number
EP1521650A2
EP1521650A2 EP03750805A EP03750805A EP1521650A2 EP 1521650 A2 EP1521650 A2 EP 1521650A2 EP 03750805 A EP03750805 A EP 03750805A EP 03750805 A EP03750805 A EP 03750805A EP 1521650 A2 EP1521650 A2 EP 1521650A2
Authority
EP
European Patent Office
Prior art keywords
lining
recess
insert
side face
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.)
Granted
Application number
EP03750805A
Other languages
German (de)
French (fr)
Other versions
EP1521650B1 (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
USINOR 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 Voest Alpine Industrienlagenbau GmbH, ThyssenKrupp Nirosta GmbH, USINOR SA filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1521650A2 publication Critical patent/EP1521650A2/en
Application granted granted Critical
Publication of EP1521650B1 publication Critical patent/EP1521650B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 the continuous casting installations of thin metallic strips of the type called “castings between cylinders", and more precisely to their refractory side faces which seal the casting space.
  • the casting of thin metal strips a few mm thick directly from liquid metal can take place on a so-called “casting between cylinders" installation, supplied with liquid metal from a distributor by means of a pouring nozzle.
  • the machine comprises an ingot mold, the casting space of which is delimited on its long sides by a pair of internally cooled cylinders with parallel horizontal axes and rotating around these axes in opposite directions, and on its short sides by closure plates (called side faces) of refractory material, applied 'against the flat ends of the cylinders.
  • Solidification of the liquid metal must only occur on the cooled cylindrical surfaces of the cylinders, by the formation of solidified skins which are made to join at the level of the neck (the area where the distance between the surfaces of the cylinders is minimal) to the strip, which is continuously extracted from the casting space.
  • parasitic solidifications that is to say layers of solidified metal which arise on certain zones of the lateral faces. They are due to the fact that the liquid metal surrounding these zones may be at a temperature substantially lower than its nominal temperature and therefore be capable of solidifying locally on contact with the lateral faces. This low temperature may be due to unfavorable hydrodynamic conditions which do not allow sufficient renewal of the liquid metal in these zones, or to an insufficient temperature of the side faces due to poor preheating before casting. Of course, several of these factors can combine.
  • Another method consists in providing a permanent heating of the lateral faces during casting, by means of burners or induction furnaces, or also also an induction heating of the metal in their vicinity. This however causes complications in the construction of the lateral face and in the management of its functioning.
  • Another method consists in playing on the composition of the refractories of the lateral face, by placing opposite the casting space of the fibrous refractories based on silica, alumina or other oxides, having strong insulating properties.
  • These highly insulating refractories can extract only a relatively small amount of heat from the liquid metal and thus limit the risk of parasitic solidifications.
  • their hardness is low, and they therefore withstand friction well against the cylinders, and also against the metal solidified or being solidified in the vicinity of the neck.
  • the object of the invention is to propose a design of lateral faces of a casting of thin strips between two cylinders making it possible to limit, better than existing designs, the appearance of parasitic solidifications.
  • the subject of the invention is a lateral face for installation for the continuous casting of metal strips between two counter-rotating cylinders with horizontal axes, internally cooled, the surfaces of which delimit a pouring space closed laterally by two lateral faces of refractory material, of the type comprising:
  • the front face facing the casting space of said lining can be set back relative to the front face of the insert over its entire height.
  • the lining has a constant thickness, and on a height "h 2 ", the lining has a thickness increasing 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 side face may include an appendage across the width of the front face of the lining, said appendage 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 set back with respect to the front surface of the part in hard refractory, and this on at least the largest part of the height of the filling.
  • FIG. 1a which schematically represents the front face of a first variant of lateral face 1 according to the invention
  • the dimensions are not to scale, for reasons of clarity of the illustration of the principle of the invention .
  • the diameters of the rotating cylinders, including the contours 2, 2 ′ of the external surfaces, when the lateral face 1 is in the working position are shown in dashed lines, range from 500 to 1500mm, while at level 3 where the neck is located, the width of the space which separates the external surfaces of the cylinders is equal to the thickness of the cast strip, namely a few mm, at most 10mm.
  • the nominal level 4 also reached by the dotted line 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 over a height "h" between the nominal level 4 of the surface of the liquid metal and level 3 of the neck.
  • the side face 1 is composed of the following elements:
  • a part 9 (which may be in one or more parts), called an “insert” arranged on the periphery of the recess 7 (except on the upper edge of the recess 7); it faces the areas surrounding the edges of the cylinders and the area 10 surrounding the neck; in general, this insert 9 must face all the parts of the lateral face 1 which are called upon to be in contact with the edges of the cylinders and the skins solidified in areas where sealing of the casting space is essential; so that this sealing is carried out permanently, despite the friction to which the insert 9 is subjected, this insert 9 must be made of a hard refractory material having a high resistance to mechanical wear and corrosion by the cast metal, such as than SiAION ® or BN, even if its high compactness should give it relatively poor insulating properties;
  • a lining 11 which fills the rest of the bottom of the recess 7, and therefore 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 side face 1, in that they ensure the confinement of the liquid metal between the cylinders and the essential for sealing the pouring space.
  • the front surfaces of the insert 9 and of the lining 11 are in the exact extension of one another.
  • the front surface 12 of the lining 11 is substantially set back from a maximum distance "d" relative to the front surface 13 of the insert 9.
  • the lining 11 Over a height "hi" from the upper edge of the recess 7, the lining 11 has a substantially constant thickness "e". This means that the front surface 12 of the lining 11 is set back a distance equal to "d" over this entire height "hi”. Then over a height "h 2 ", this thickness gradually increases so that at the lower edge 14 of the recess 7, this thickness is equal to that of the insert 9, as can be seen on the fig.lc. In this figure, a linear growth of this thickness has been shown, giving a flat shape to the front surface 12 of the lining 11 in the zone considered. But other variants are possible, for example a growth in 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 until it becomes substantially equal to that of insert 13 is, if not completely essential, at least highly recommended. Otherwise, the insert 9 offers 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 zone 10 surrounding the neck, which would be unfavorable to the regularity of the conditions of casting and solidification of the strip.
  • the distance "d” is of the order of at least 10 mm and can reach several tens of mm, or even a few hundred mm (for example 250 mm), preferably from 80 to 150 mm.
  • "H 2 " is typically (but not limited to) of the order of 1.5 xd, so as to impose on the front surface 12 of the lining 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, in other words that "hi" is equal to 0.
  • the lateral face 1 Compared to the lateral faces of the prior art, the lateral face 1 according to the invention has the following advantages.
  • the parasitic solidifications which could occur on the lining 11 are carried far back from the lower part of the casting space. If the resulting solid metal is entrained in the bottom of the casting space, it has more time to melt 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 no longer has a width substantially equal to that of the casting strip, but greater by a value equal to twice "d ".
  • This upper surface of the liquid metal therefore has a larger area than what is usually encountered for a given width of the cast strip.
  • 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 lateral faces 1, in zones of width “d” which are not located vertically above the strip being solidified.
  • 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 heat losses by radiation of the liquid metal located in the space of casting.
  • this drawback is minimal if, as is almost always the case, the casting space is covered by a cover which returns the radiation to the metal.
  • the lining 11 comprises over 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 it over a distance equal, for example, to "d".
  • This appendix 15 can, moreover, be used to rest the cover there, as described in document EP-A-0 875 315 in the case of conventional side faces.
  • the appendix 15 is located at the upper edge of the lining 11. But it could just as easily be located a little lower, the main thing being that it is always above the surface of the metal liquid present in the casting space, so as to return the radiation it receives.
  • FIGS. 2a-2d the elements common with the variant in Figure 1 are identified by the same references.
  • 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.
  • this height h 3 can vary between a few mm and a few cm, depending in particular on the possibility of avoiding the appearance of parasitic solidifications in this area thanks, for example, to a suitable geometry of the pouring nozzle.

Landscapes

  • 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

Face latérale pour installation de coulée continue de bandes métalliques entre deux cylindres Side face for installation of continuous casting of metal strips between two cylinders
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. 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 invention relates to the continuous casting of metals. It relates more particularly to the continuous casting installations of thin metallic strips of the type called "castings between cylinders", and more precisely to their refractory side faces which seal the casting space. The casting of thin metal strips a few mm thick directly from liquid metal (steel or copper, for example) can take place on a so-called "casting between cylinders" installation, supplied with liquid metal from a distributor by means of a pouring nozzle. The machine comprises an ingot mold, the casting space of which is delimited on its long sides by a pair of internally cooled cylinders with parallel horizontal axes and rotating around these axes in opposite directions, and on its short sides by closure plates (called side faces) of refractory material, applied 'against the flat ends of the cylinders. Solidification of the liquid metal must only occur on the cooled cylindrical surfaces of the cylinders, by the formation of solidified skins which are made to join at the level of the neck (the area where the distance between the surfaces of the cylinders is minimal) to the strip, which is continuously extracted 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, it is however difficult to permanently avoid the appearance of solidifications called "parasitic solidifications", that is to say layers of solidified metal which arise on certain zones of the lateral faces. They are due to the fact that the liquid metal surrounding these zones may be at a temperature substantially lower than its nominal temperature and therefore be capable of solidifying locally on contact with the lateral faces. This low temperature may be due to unfavorable hydrodynamic conditions which do not allow sufficient renewal of the liquid metal in these zones, or to an insufficient temperature of the side faces due to poor preheating before casting. Of course, several of these factors can combine. 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 which is added to the normal thickness of the product. It follows that the cylinders must momentarily absorb an additional force which forces them to temporarily separate from one another to avoid their deterioration. The quality of the tape is adversely affected. We can also see a decline in lateral face, with the risks of loss of tightness of the casting space associated therewith.
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, we try to limit the appearance of parasitic solidifications by adopting particular nozzle configurations. They aim to impose on the liquid metal located in the casting space flow conditions which are supposed to ensure a permanent renewal of the metal in front of the zones where parasitic solidifications are most likely to occur, for example by bringing out liquid metal of the nozzle directly near these areas. This can however lead to a deficit in the supply of liquid metal to 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 consists in providing a permanent heating of the lateral faces during casting, by means of burners or induction furnaces, or also also an induction heating of the metal in their vicinity. This however causes complications in the construction of the lateral face and in the management of its functioning.
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 consists in playing on the composition of the refractories of the lateral face, by placing opposite the casting space of the fibrous refractories based on silica, alumina or other oxides, having strong insulating properties. These highly insulating refractories can extract only a relatively small amount of heat from the liquid metal and thus limit the risk of parasitic solidifications. However, their hardness is low, and they therefore withstand friction well against the cylinders, and also against the metal solidified or being solidified in the vicinity of the neck. This is why in the zones of the lateral face which frame their contact arcs with the edges of the cylinders and in the zones which face the lower part of the casting space, the abovementioned insulating refractory is replaced with inserts made of a material with poorer insulating power but 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 transfers between the hard refractory and the insulating refractory occur in their contact zone, which leads to localized cooling of the insulating refractory. This may 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 propose a design of lateral faces of a casting of thin strips between two cylinders making it possible 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 :To this end, the subject of the invention is a lateral face for installation for the continuous casting of metal strips between two counter-rotating cylinders with horizontal axes, internally cooled, the surfaces of which delimit a pouring space closed laterally by two lateral faces of refractory material, of the type comprising:
- une plaque support sur la face avant de laquelle est ménagé un évidement ;- a support plate on the front face of which is formed a recess;
- un insert en matériau dur disposé à la périphérie de l'évidement ;- an insert of hard material disposed at the periphery of the recess;
- 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.- a filling filling the remainder of the recess; characterized in that the front face facing the casting space of said lining, is set back a maximum distance from the front face of the insert over at least part 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 can be set back relative to the front face of the insert over its entire height.
Préférentiellement, sur une hauteur « hi» 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 "hi" from the upper edge of the recess, the lining has a constant thickness, and on a height "h 2 ", the lining has a thickness increasing 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. La distance est de préférence égale à 5mm ou davantage. 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. 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.Alternatively, 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 side face may include an appendage across the width of the front face of the lining, said appendage being intended to overhang the surface of the liquid metal present in the casting space. As will be understood, the invention essentially consists in placing the front surface of the insulating refractory lining of the lateral face substantially set back with respect to the front surface of the part in hard refractory, and this on at least the largest part of the height of the filling.
L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées suivantes :The invention will be better understood on reading the description which follows, given with reference to the following appended figures:
- la figure 1a qui montre en vue de face une première variante d'une face latérale de coulée continue entre cylindres selon l'invention ;- Figure 1a which shows in front view a first variant of a lateral face of continuous casting between cylinders according to the invention;
- la figure 1 b 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 ;- Figure 1b which shows seen in section along Ib-Ib a detail of this side face; - Figure 1c which shows in section along Ic-Ic another detail of this side face;
- 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.- Figure 1d which shows in section along Id-Id another detail of this side face; - Figures 2a to 2d which show 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.In FIG. 1a, which schematically represents the front face of a first variant of lateral face 1 according to the invention, the dimensions are not to scale, for reasons of clarity of the illustration of the principle of the invention . It should be known that on the installations likely to be used industrially for the casting of steel, the diameters of the rotating cylinders, including the contours 2, 2 ′ of the external surfaces, when the lateral face 1 is in the working position, are shown in dashed lines, range from 500 to 1500mm, while at level 3 where the neck is located, the width of the space which separates the external surfaces of the cylinders is equal to the thickness of the cast strip, namely a few mm, at most 10mm. The nominal level 4 also reached by the dotted line 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 over a height "h" between the nominal level 4 of the surface of the liquid metal and level 3 of the neck.
La face latérale 1 se compose des éléments suivants :The side face 1 is composed of the following elements:
- 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 ;- 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 face of which act the members (not shown) which apply the side face 1 against the ends of the cylinders 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 résistance 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 ;- A part 9 (which may be in one or more parts), called an “insert” arranged on the periphery of the recess 7 (except on the upper edge of the recess 7); it faces the areas surrounding the edges of the cylinders and the area 10 surrounding the neck; in general, this insert 9 must face all the parts of the lateral face 1 which are called upon to be in contact with the edges of the cylinders and the skins solidified in areas where sealing of the casting space is essential; so that this sealing is carried out permanently, despite the friction to which the insert 9 is subjected, this insert 9 must be made of a hard refractory material having a high resistance to mechanical wear and corrosion by the cast metal, such as than SiAION ® or BN, even if its high compactness should give it relatively poor insulating properties;
- 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.- A lining 11 which fills the rest of the bottom of the recess 7, and therefore 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 side face 1, in that they ensure the confinement of the liquid metal between the cylinders and the essential for sealing the pouring 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 lateral faces known from the prior art, the front surfaces of the insert 9 and of the lining 11 are in the exact extension of one another. However, according to the invention, the front surface 12 of the lining 11 is substantially set back from a maximum distance "d" relative to the front surface 13 of the insert 9.
Sur une hauteur « h-i » 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 « hi ». 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.lc. 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.Over a height "hi" from the upper edge of the recess 7, the lining 11 has a substantially constant thickness "e". This means that the front surface 12 of the lining 11 is set back a distance equal to "d" over this entire height "hi". Then over a height "h 2 ", this thickness gradually increases so that at the lower edge 14 of the recess 7, this thickness is equal to that of the insert 9, as can be seen on the fig.lc. In this figure, a linear growth of this thickness has been shown, giving a flat shape to the front surface 12 of the lining 11 in the zone considered. But other variants are possible, for example a growth in 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 until it becomes substantially equal to that of insert 13 is, if not completely essential, at least highly recommended. Otherwise, the insert 9 offers 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 zone 10 surrounding the neck, which would be unfavorable to the regularity of the conditions of casting and solidification of the strip.
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, or even a few hundred mm (for example 250 mm), preferably from 80 to 150 mm. "H 2 " is typically (but not limited to) of the order of 1.5 xd, so as to impose on the front surface 12 of the lining 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 « hi » 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, in other words that "hi" is equal to 0.
Par rapport aux faces latérales de l'art antérieur, la face latérale 1 selon l'invention présente les avantages suivants.Compared 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 which could occur on the lining 11 are carried far back from the lower part of the casting space. If the resulting solid metal is entrained in the bottom of the casting space, it has more time to melt 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 réentrainees 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. 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.At level 4 of the upper surface of the liquid metal located in the casting space, the casting space no longer has a width substantially equal to that of the casting strip, but greater by a value equal to twice "d ". This upper surface of the liquid metal therefore has a larger area than what 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.) which decant from the liquid metal have a larger surface area for distribution. In particular, they have the possibility of being housed in the vicinity of the lateral faces 1, in zones of width “d” which are not located vertically above the strip being solidified. They are then relatively unlikely to be reentrained by the streams of liquid metal to find themselves, ultimately, in the solidified strip. This gathering of impurities in the vicinity of the lateral faces 1 can be favored by a shape imprinted on the flows in the casting space thanks to a casting nozzle designed accordingly. Finally, the liquid metal which comes into contact with the lining 11 at the initial stages of casting, when the lateral face 1 has not yet completely 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 directly form the solidified strip, and before reaching the solidification zone facing the cylinders, it has the possibility of being heated by the liquid metal which has not been in contact with the side faces 1. Thus, in particular at the start 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 heat losses by radiation of the liquid metal located in the space of casting. However, this drawback is minimal if, as is almost always the case, the casting space is covered by a cover which returns the radiation to the metal. It is also possible, as shown in FIG. 1, to provide that the lining 11 comprises over 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 it over a distance equal, for example, to "d". This appendix 15 can, moreover, be used to rest the cover there, as described in 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 just as easily be located a little lower, the main thing being that it is always above the surface of the metal liquid present 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 one wishes not to have too sudden a variation in the width of the pouring space in the vicinity of level 3 of the neck, one can use the variant of the invention shown in FIGS. 2a-2d (the elements common with the variant in 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 requirements, this height h 3 can vary between a few mm and a few cm, depending in particular on the possibility of avoiding the appearance of parasitic solidifications in this area thanks, for example, to a suitable geometry of the pouring nozzle.
Comme à propos de la variante précédente, il est envisageable que « hi » soit égale à 0. As with the previous variant, it is conceivable that "hi" is equal to 0.

Claims

REVENDICATIONS
1. Face latérale (1) pour installation de coulée continue de bandes métalliques (5) entre deux cylindres (2, 2') contrarotatifs à axes horizontaux, refroidis intérieurement, dont les surfaces délimitent un espace de coulée obturé latéralement par deux faces latérales (1) en matériau réfractaire, du type comportant :1. Side face (1) for installation of continuous casting of metal strips (5) between two cylinders (2, 2 ') counter-rotating with horizontal axes, internally cooled, the surfaces of which delimit a casting space closed laterally by two lateral faces ( 1) of refractory material, of the type comprising:
- une plaque support (6) sur la face avant de laquelle est ménagé un évidement (7) ; - un insert (9) en matériau dur disposé à la périphérie de l'évidement- a support plate (6) on the front face of which is formed a recess (7); - an insert (9) of hard material disposed at the periphery of the recess
(7) ;(7);
- un garnissage (11 ) remplissant le restant de l'évidement (7) ; caractérisée en ce que la face frontale (12) tournée vers l'espace de coulée dudit garnissage (11 ), est en retrait d'une distance maximale (d) par rapport à la face frontale (13) de l'insert (9) sur au moins une partie de sa hauteur.- a lining (11) filling the remainder of the recess (7); characterized in that the front face (12) facing the casting space of said lining (11), is set back a maximum distance (d) relative to the front face (13) of the insert (9) over at least part of its height.
2. Face latérale (1 ) selon la revendication 1 , caractérisée en ce que la face frontale (12) tournée vers l'espace de coulée dudit garnissage (11) est en retrait par rapport à la face frontale de l'insert (9) sur la totalité de sa hauteur. 2. Side face (1) according to claim 1, characterized in that the front face (12) facing the casting space of said lining (11) is set back relative to the front face of the insert (9) over its entire height.
3. Face latérale (1) selon la revendication 1 ou 2, caractérisée en ce que, sur une hauteur (h-i) à partir du bord supérieur de l'évidement (7), le garnissage (11) présente une épaisseur constante (e), et en ce que sur une hauteur (h2), le garnissage (11 ) présente une épaisseur croissante jusqu'à un niveau où ladite épaisseur est égale à celle de l'insert (9). 3. side face (1) according to claim 1 or 2, characterized in that, over a height (hi) from the upper edge of the recess (7), the lining (11) has a constant thickness (e) , and in that over a height (h 2 ), the lining (11) has an increasing thickness up to a level where said thickness is equal to that of the insert (9).
4. Face latérale (1) selon la revendication 3, caractérisée en ce que ledit niveau où ladite épaisseur est égale à celle de l'insert (9) est le bord inférieur (14) de l'évidement (7).4. Side face (1) according to claim 3, characterized in that said level where said thickness is equal to that of the insert (9) is the lower edge (14) of the recess (7).
5. Face latérale (1 ) selon la revendication 1 , caractérisée en ce que le garnissage (11) présente une épaisseur croissante depuis le bord supérieur de l'évidement (7) jusqu'au bord inférieur (14) de l'évidement (7).5. Side face (1) according to claim 1, characterized in that the lining (11) has an increasing thickness from the upper edge of the recess (7) to the lower edge (14) of the recess (7 ).
6. Face latérale (1) selon l'une des revendications 1 à 5, caractérisée en ce que la distance (d) est égale à 10 mm ou davantage. 6. Side face (1) according to one of claims 1 to 5, characterized in that the distance (d) is equal to 10 mm or more.
7. Face latérale (1 ) selon la revendication 6, caractérisée en ce que la distance (d) est comprise entre 80 et 150 mm.7. Side face (1) according to claim 6, characterized in that the distance (d) is between 80 and 150 mm.
8. Face latérale (1) selon l'une des revendications 1 à 7, caractérisée en ce qu'elle comporte un appendice (15) sur la largeur de la face frontale (12)8. Side face (1) according to one of claims 1 to 7, characterized in that it comprises an appendage (15) over the width of the front face (12)
! du garnissage (11), ledit appendice (15) étant destiné à surplomber la surface du métal liquide présent dans l'espace de coulée. ! of the lining (11), said appendage (15) being intended 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)

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FR0208853A FR2842130B1 (en) 2002-07-12 2002-07-12 SIDE SIDE FOR INSTALLATION OF CONTINUOUS CASTING OF METAL STRIPS BETWEEN TWO CYLINDERS
FR0208853 2002-07-12
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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EP1521650B1 EP1521650B1 (en) 2012-01-25

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Title
See references of WO2004007116A2 *

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MXPA05000390A (en) 2005-03-23
KR101069609B1 (en) 2011-10-05
AU2003269022A1 (en) 2004-02-02
CN1668404A (en) 2005-09-14
RU2305611C2 (en) 2007-09-10
FR2842130A1 (en) 2004-01-16
EP1521650B1 (en) 2012-01-25
ATE542621T1 (en) 2012-02-15
JP2005536352A (en) 2005-12-02
WO2004007116A3 (en) 2004-04-08
CN1299856C (en) 2007-02-14
KR20050045985A (en) 2005-05-17
RU2005103635A (en) 2005-07-27
AU2003269022B2 (en) 2009-10-01
US20060081352A1 (en) 2006-04-20
WO2004007116A2 (en) 2004-01-22
FR2842130B1 (en) 2004-10-15
JP4418749B2 (en) 2010-02-24
US7258157B2 (en) 2007-08-21

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