EP0228335B1 - Continuous-casting mould with a hot top - Google Patents
Continuous-casting mould with a hot top Download PDFInfo
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- EP0228335B1 EP0228335B1 EP86440098A EP86440098A EP0228335B1 EP 0228335 B1 EP0228335 B1 EP 0228335B1 EP 86440098 A EP86440098 A EP 86440098A EP 86440098 A EP86440098 A EP 86440098A EP 0228335 B1 EP0228335 B1 EP 0228335B1
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- insert
- ingot mould
- refractory material
- metal
- thermal conductivity
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
Definitions
- the invention relates to a vertical or substantially vertical ingot mold for the continuous casting of molten metals such as steel. More particularly, the invention relates to an ingot mold made of copper or copper alloy, with a hot head, that is to say in which the heat exchanges, at the meniscus, between the cast metal and the ingot mold are slowed down so as to to reduce the oscillation wrinkles on the cast product.
- this metal insert the average thickness of which can be a few millimeters (the thickness can be uniform, or even decrease from top to bottom of the insert), is done using an expensive technique (generally plating by explosion) due to the need to obtain perfect contact between the metal insert and the wall of the mold.
- This necessity results in particular from the fact that any non-zero contact thermal resistance introduces a predetermined and non-reproducible datum into the overall thermal resistance of the mold.
- these ingot molds often include a surface wear coating of nickel intended to avoid the formation of star cracks in the cast product: the addition of a thermal contact resistance risks bringing the nickel to a close temperature. its limit around 600 ° C (temperature) of metal near the wall: around 1540 ° C).
- the object of the invention is to propose a new type of insert for an ingot mold with a hot head, which does not have the aforementioned drawbacks.
- the insert is formed by a thin deposit of a refractory material with thermal conductivity less than 20 Wm -1 K -1 having good resistance to thermal shocks, such as that alumina, zirconia, boron nitride, chromium carbide, and the thickness of which, taken between approximately 200 and 500 ⁇ m, is chosen so that, at the contact temperature of the metal with said deposited material, said metal being solidified has a solid fraction of between 25 and 35% by weight.
- a refractory material with thermal conductivity less than 20 Wm -1 K -1 having good resistance to thermal shocks such as that alumina, zirconia, boron nitride, chromium carbide, and the thickness of which, taken between approximately 200 and 500 ⁇ m, is chosen so that, at the contact temperature of the metal with said deposited material, said metal being solidified has a solid fraction of between 25 and 35% by weight.
- the inventors have in fact found that if the solid fraction on the surface of the cast metal is greater than approximately 35%, a thick and rigid horn which cannot be obtained by cooling in the region of the meniscus near the wall of the mold. more deform, resulting in the formation of oscillation wrinkles.
- the meniscus Conversely, if the solid fraction is weak, the meniscus has no more consistency or rigidity; but maintaining a liquid fraction of less than 25% amounts to inhibiting a large part of the cooling in the mold.
- the refractory materials chosen resist temperatures of around 1800 ° C.
- Their thermal conductivity is preferably less than 10W.m - 1K - 1, to be compared to conductivities of the order of 50, 100 and 300 Wm - 1K - 1 respectively for stainless steel, nickel and copper-silver alloy inserts.
- the small thicknesses envisaged are advantageously between 2 and 5 / 10ths of a mm, to be compared with a few millimeters in thickness of the metal inserts.
- the refractory materials are in particular alumina (melting temperature: 2040 ° C; thermal conductivity ranging between 2 Wm -1 K - 1 and higher values depending on the treatment undergone), zirconia (melting temperature: 2700 ° C ; thermal conductivity: 1 Wm - 1K - 1), boron nitride, or, so preferred, chromium carbide (melting temperature: 1800 °; thermal conductivity: 7.5 Wm ⁇ 1K ⁇ 1).
- the deposition of the material is obtained by spraying in a hot powder manner, for example by means of a plasma torch or preferably a detonation gun (according to the technique marketed by the company "Union Carbon Corporation"), followed polishing.
- a plasma torch or preferably a detonation gun according to the technique marketed by the company "Union Carbon Corporation"
- This technique provides excellent adhesion between the support and the filler material, and a homogeneous coating free of roughness.
- the deposit is made in a recess in the wall of the mold, of depth equal to the thickness of the deposit, made either in the copper of the wall, or in the surface coating of nickel or chromium if one is provided. .
- FIG. 1 represents a partial section of the wall of an ingot mold according to the invention
- FIG. 2 is a similar view when the mold is provided with a surface coating
- FIG. 3 is a graph showing the variation of the surface flux of heat dissipated by the ingot mold as a function of the distance from the surface of the meniscus (ordinate 0),
- FIG. 4 is a representation of the profile of the oscillation wrinkles on slabs of continuous casting in a mold according to the invention
- FIG. 5 is a similar representation with an ingot mold without insert.
- the copper wall 1 has a recess 2 of 3/10 th mm in thickness and about fifteen centimeters in height covering the region of the meniscus taking account of the oscillations on the one hand and possible variations in average level.
- the recess 2 is filled with a deposit 3 of Cr3C2 obtained by projection with detonation cannon, followed by polishing.
- the recess 2 ⁇ is made from the chrome coating 4, 0.3 mm thick, covering the wall 1 ⁇ of the mold.
- the material 3 ⁇ is flush with the internal surface of the mold.
- the graph in FIG. 3 makes it possible to compare the values of the local densities of heat flow ⁇ c extracted by the ingot mold equipped with an insert according to the invention, made of chromium carbide (curve B), with the values obtained using a conventional ingot mold. without insert (curve A).
- the straight line C in broken lines located at d ⁇ 70 mm corresponds to the lower limit of the insert, which, in this particular case, and for an insert of approximately 150 mm high, indicates that the meniscus is substantially mid-height of said insert.
- the two curves A and B correspond to the continuous casting of slabs with an extraction speed of 1.3 m / min.
- the inventors were able to observe, by studying a mathematical model established for cooling in an ingot mold without insert, that the surface temperature of the steel in contact with the ingot mold is close to the solidus of the steel grade (1493 ° C), which indicates a significant solidification of the meniscus horn.
- the inventors have found that it was necessary to divide by four the heat extraction provided by the copper walls in the vicinity of the meniscus.
- the density of thermal flux extracted by the ingot mold is substantially divided by a factor 4.
- the density of flux extracted at the meniscus is around 2 MW / m2 (curve A), and the use of a thin chromium carbide insert brings this value to around 500 kW / m2.
- Figures 4 and 5 compare the longitudinal profiles of the surface of a low carbon steel slab cast at the speed of 1.3 m / min with an oscillation frequency of 117 strokes per minute.
- Figure 4 corresponds to a profile obtained by solidification against the wall of an ingot mold equipped with an insert according to the invention
- Figure 5 corresponds to an equivalent profile obtained with a conventional ingot mold without insert.
- the invention is not limited to the embodiments and to the applications described above by way of example.
- the dimensions of the insert can be adapted to the molds and cast products.
- the casting parameters extraction speed, frequency of oscillations
- the mold according to the invention can be used both for continuous casting of slabs and other products (blooms).
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Abstract
Description
L'invention concerne une lingotière verticale ou sensiblement verticale pour la coulée continue des métaux en fusion tel que l'acier. Plus particulièrement, l'invention concerne une lingotière en cuivre ou alliage de cuivre, à tête chaude, c'est-à-dire dans laquelle les échanges thermiques, au niveau du ménisque, entre le métal coulé et la lingotière sont ralentis de manière à atténuer les rides d'oscillation sur le produit coulé.The invention relates to a vertical or substantially vertical ingot mold for the continuous casting of molten metals such as steel. More particularly, the invention relates to an ingot mold made of copper or copper alloy, with a hot head, that is to say in which the heat exchanges, at the meniscus, between the cast metal and the ingot mold are slowed down so as to to reduce the oscillation wrinkles on the cast product.
On connaît, par exemple par les documents FR-A-2 528 738 et FR-A-2 540 409, une telle lingotière, dont les parois énergétiquement refroidies par circulation d'un liquide de refroidissement, comportent à leur partie supérieure un insert ;métallique d'acier inoxydable, dont la conductivité thermique est inférieure à celle du métal constituant les parois de la lingotière. De la sorte, le métal est moins refroidi au voisinage du ménisque, ce qui permet de diminuer la profondeur des rides d'oscillation et la longueur de la corne solidifiée qui accompagne leur formation. On sait que de telles rides constituent des points sensibles où naissent préférentiellement des criques de surface préjudiciables à la qualité du produit fini.We know, for example from documents FR-A-2 528 738 and FR-A-2 540 409, such an ingot mold, the walls of which are energetically cooled by circulation of a cooling liquid, have an insert at their upper part; metal of stainless steel, whose thermal conductivity is lower than that of the metal constituting the walls of the mold. In this way, the metal is less cooled in the vicinity of the meniscus, which makes it possible to reduce the depth of the oscillation wrinkles and the length of the solidified horn which accompanies their formation. It is known that such wrinkles constitute sensitive points where preferential surface cracks arise which are detrimental to the quality of the finished product.
La mise en place de cet insert métallique, dont l'épaisseur moyenne peut être de quelques millimètres (l'épaisseur peut être uniforme, ou bien décroître du haut en bas de l'insert), se fait selon une technique coûteuse (en général placage par explosion) en raison de la nécessité d'obtenir un contact parfait entre l'insert métallique et la paroi de la lingotière. Cette nécessité résulte notamment du fait que toute résistance thermique de contact non nulle introduit une donnée prédéterminée et non reproductible dans la résistance thermique globale de la lingotière. D'autre part, ces lingotières comportent souvent un revêtement superficiel d'usure en nickel destiné à éviter la formation de criques en étoile dans le produit coulé : l'addition d'une résistance thermique de contact risque de conduire le nickel à une température proche de sa limite autour de 600°C (température) du métal au voisinage de la paroi : environ 1540°C).The installation of this metal insert, the average thickness of which can be a few millimeters (the thickness can be uniform, or even decrease from top to bottom of the insert), is done using an expensive technique (generally plating by explosion) due to the need to obtain perfect contact between the metal insert and the wall of the mold. This necessity results in particular from the fact that any non-zero contact thermal resistance introduces a predetermined and non-reproducible datum into the overall thermal resistance of the mold. On the other hand, these ingot molds often include a surface wear coating of nickel intended to avoid the formation of star cracks in the cast product: the addition of a thermal contact resistance risks bringing the nickel to a close temperature. its limit around 600 ° C (temperature) of metal near the wall: around 1540 ° C).
Le but de l'invention est de proposer un nouveau type d'insert pour lingotière à tête chaude, qui ne présente pas les inconvénients précités.The object of the invention is to propose a new type of insert for an ingot mold with a hot head, which does not have the aforementioned drawbacks.
Selon l'invention, l'insert, de 10 à 20 cm de long environ, est constitué par un mince dépôt d'un matériau réfractaire de conductivite thermique inférieure a 20 W.m-1K-1 ayant une bonne tenue aux chocs thermiques, tel que l'alumine, la zircone, le nitrure de bore, le carbure de chrome, et dont l'épaisseur, prise entre environ 200 et 500 µm, est choisie de manière que, à la température de contact du métal avec ledit matériau déposé, ledit métal en cours de solidification présente une fraction solide comprise entre 25 et 35 % environ en poids.According to the invention, the insert, about 10 to 20 cm long, is formed by a thin deposit of a refractory material with thermal conductivity less than 20 Wm -1 K -1 having good resistance to thermal shocks, such as that alumina, zirconia, boron nitride, chromium carbide, and the thickness of which, taken between approximately 200 and 500 μm, is chosen so that, at the contact temperature of the metal with said deposited material, said metal being solidified has a solid fraction of between 25 and 35% by weight.
Les inventeurs ont en effet constaté que si la fraction solide à la surface du métal coulé est supérieur à environ 35 %, on obtient, par refroidissement dans la zone du ménisque proche de la paroi de la lingotière, une corne épaisse et rigide qui ne peut plus se déformer, ce qui entraîne la formation des rides d'oscillation.The inventors have in fact found that if the solid fraction on the surface of the cast metal is greater than approximately 35%, a thick and rigid horn which cannot be obtained by cooling in the region of the meniscus near the wall of the mold. more deform, resulting in the formation of oscillation wrinkles.
Inversement, si la fraction solide est faible, le ménisque n'a plus de consistance ni rigidité ; mais maintenir une fraction liquide inférieure à 25 % revient à inhiber une part importante du refroidissement en lingotière.Conversely, if the solid fraction is weak, the meniscus has no more consistency or rigidity; but maintaining a liquid fraction of less than 25% amounts to inhibiting a large part of the cooling in the mold.
Dans le domaine considéré, les matériaux réfractaires choisis résistent à des températures d'environ 1800°C. Leur conductivité thermique est de préférence inférieure à 10W.m-¹K-¹, à comparer à des conductivités de l'ordre de 50, 100 et 300 W.m-¹K-¹ respectivement pour des inserts en inox, nickel et alliage cuivre-argent.In the field under consideration, the refractory materials chosen resist temperatures of around 1800 ° C. Their thermal conductivity is preferably less than 10W.m - ¹K - ¹, to be compared to conductivities of the order of 50, 100 and 300 Wm - ¹K - ¹ respectively for stainless steel, nickel and copper-silver alloy inserts.
Les faibles épaisseurs envisagées sont avantageusement comprises entre 2 et 5/10e de mm, à comparer aux quelques millimètres d'épaisseur des inserts métalliques.The small thicknesses envisaged are advantageously between 2 and 5 / 10ths of a mm, to be compared with a few millimeters in thickness of the metal inserts.
Les matériaux réfractaires sont notamment l'alumine (température de fusion : 2040°C ; conductivité thermique s'échelonnant entre 2 W.m-1K-¹ et des valeurs supérieures selon le traitement subi), la zircone (température de fusion : 2700°C ; conductivité thermique : 1 W.m-¹K-¹), le nitrure de bore, ou, de manière préférée, le carbure de chrome (température de fusion : 1800° ; conductivité thermique : 7,5 W.m⁻¹K⁻¹).The refractory materials are in particular alumina (melting temperature: 2040 ° C; thermal conductivity ranging between 2 Wm -1 K - ¹ and higher values depending on the treatment undergone), zirconia (melting temperature: 2700 ° C ; thermal conductivity: 1 Wm - ¹K - ¹), boron nitride, or, so preferred, chromium carbide (melting temperature: 1800 °; thermal conductivity: 7.5 Wm⁻¹K⁻¹).
Le dépôt du matériau s'obtient par projection de manière pulvérulente à chaud, par exemple au moyen d'une torche à plasma ou de préférence d'un canon à détonation (selon la technique commercialisée par la société "Union Carbon Corporation"), suivi d'un polissage. Cette technique permet d'obtenir un accrochage excellent entre le support et le matériau d'apport, et un revêtement homogène exempt d'aspérité.The deposition of the material is obtained by spraying in a hot powder manner, for example by means of a plasma torch or preferably a detonation gun (according to the technique marketed by the company "Union Carbon Corporation"), followed polishing. This technique provides excellent adhesion between the support and the filler material, and a homogeneous coating free of roughness.
Le dépôt est pratiqué dans un évidement de la paroi de la lingotière, de profondeur égale à l'épaisseur de dépôt, pratiqué soit dans le cuivre de la paroi, soit dans le revêtement superficiel de nickel ou de chrome s'il en est prévu un.The deposit is made in a recess in the wall of the mold, of depth equal to the thickness of the deposit, made either in the copper of the wall, or in the surface coating of nickel or chromium if one is provided. .
D'autres caractéristiques et avantages apparaîtront dans la description qui va être faite d'un mode particulier de réalisation de l'invention. On se reportera aux dessins annexés dans lesquels :Other characteristics and advantages will appear in the description which will be given of a particular embodiment of the invention. Reference is made to the appended drawings in which:
- la figure 1 représente une coupe partielle de la paroi d'une lingotière conforme à l'invention,FIG. 1 represents a partial section of the wall of an ingot mold according to the invention,
- la figure 2 est une vue similaire lorsque la lingotière est pourvue d'un revêtement superficiel,FIG. 2 is a similar view when the mold is provided with a surface coating,
- la figure 3 est un graphique montrant la variation du flux surfacique de chaleur dissipée par la lingotière en fonction de la distance par rapport à la surface du ménisque (ordonnée 0),FIG. 3 is a graph showing the variation of the surface flux of heat dissipated by the ingot mold as a function of the distance from the surface of the meniscus (ordinate 0),
- figure 4 est une représentation du profil des rides d'oscillations sur des brames de coulée continue dans une lingotière selon l'invention,FIG. 4 is a representation of the profile of the oscillation wrinkles on slabs of continuous casting in a mold according to the invention,
- figure 5 est une représentation similaire avec une lingotière sans insert.- Figure 5 is a similar representation with an ingot mold without insert.
Sur la figure 1, la paroi 1 en cuivre comporte un évidement 2 de 3/10e mm d'épaisseur et d'une quinzaine de centimètres de hauteur couvrant la région du ménisque compte tenu des oscillations d'une part et des éventuelles variations de niveau moyen. L'évidement 2 est comblé par un dépôt 3 de Cr₃C₂ obtenu par projection au canon à détonation, suivi d'un polissage.In FIG. 1, the copper wall 1 has a
Sur la figure 2, l'évidement 2ʹ est pratiqué à partir du revêtement de chrome 4, de 0,3 mm d'épaisseur, couvrant la paroi 1ʹ de la lingotière. Le matériau 3ʹ affleure la surface interne de la lingotière.In Figure 2, the recess 2ʹ is made from the
Le graphique de la figure 3 permet de comparer les valeurs des densités locales de flux thermique Φc extrait par la lingotière équipée d'un insert selon l'invention, en carbure de chrome (courbe B), aux valeurs obtenues en utilisant une lingotière conventionnelle sans insert (courbe A). La droite C en traits interrompus située à d ≃ 70 mm, correspond à la limite inférieure de l'insert, ce qui, dans ce cas particulier, et pour un insert de 150 mm de haut environ, indique que le ménisque se trouve sensiblement à mi- hauteur dudit insert. Les deux courbes A et B correspondent à la couléecontinue de brames avec une vitesse d'extraction de 1,3 m/min.The graph in FIG. 3 makes it possible to compare the values of the local densities of heat flow Φ c extracted by the ingot mold equipped with an insert according to the invention, made of chromium carbide (curve B), with the values obtained using a conventional ingot mold. without insert (curve A). The straight line C in broken lines located at d ≃ 70 mm, corresponds to the lower limit of the insert, which, in this particular case, and for an insert of approximately 150 mm high, indicates that the meniscus is substantially mid-height of said insert. The two curves A and B correspond to the continuous casting of slabs with an extraction speed of 1.3 m / min.
Dans les conditions d'échange thermique retenues pour cet exemple, les inventeurs ont pu constater,par l'étude d'un modèle mathématique établi pour un refroidissement en lingotière sans insert, que la température de surface de l'acier au contact avec la lingotière est proche du solidus de la nuance d'acier (1493°C), ce qui indique une solidification importante de la corne du ménisque. Pour ramener la fraction solidifiée au contact avec la lingotière à environ 30 %, les inventeurs ont trouvé qu'il fallait diviser par quatrel'extraction calorifique assurée par les parois de cuivre au voisinage du ménisque.Under the heat exchange conditions adopted for this example, the inventors were able to observe, by studying a mathematical model established for cooling in an ingot mold without insert, that the surface temperature of the steel in contact with the ingot mold is close to the solidus of the steel grade (1493 ° C), which indicates a significant solidification of the meniscus horn. To bring the solidified fraction in contact with the ingot mold to about 30%, the inventors have found that it was necessary to divide by four the heat extraction provided by the copper walls in the vicinity of the meniscus.
On remarque sur la figure 3 que, conformément au but recherché, dans la zone de l'insert la densité de flux thermique extrait par la lingotière est sensiblement divisé par un facteur 4. En effet dans une lingotière classique, la densité de flux extrait au voisinage du ménisque est de l'ordre de 2 MW/m² (courbe A), et l'utilisation d'un insert mince en carbure de chrome ramène cette valeur au voisinage de 500 kW/m².It can be seen in FIG. 3 that, in accordance with the aim sought, in the area of the insert the density of thermal flux extracted by the ingot mold is substantially divided by a
De plus, dès la sortie de l'insert (ligne en traits interrompus), l'extraction calorifique mesurée localement est proche des valeurs obtenues sur une lingotière conventionnelle, ce qui permet de constater que le refroidissement global en lingotière en dessous de l'insert est peu perturbé par la présence de celui-ci.In addition, as soon as it leaves the insert (dashed line), the locally measured heat extraction is close values obtained on a conventional ingot mold, which shows that the overall cooling in the ingot mold below the insert is little disturbed by the presence of the latter.
Les figures 4 et 5 permettent de comparer les profils longitudinaux de la surface d'une brame d'acier à bas carbone coulée à la vitesse de 1,3 m/min avec une fréquence d'oscillation de 117 coups par minute. La figure 4 correspond à un profil obtenu par solidification contre la paroi d'une lingotière équipée d'un insert selon l'invention, et la figure 5 correspond à un profil équivalent obtenu avec une lingotière conventionnelle sans insert.Figures 4 and 5 compare the longitudinal profiles of the surface of a low carbon steel slab cast at the speed of 1.3 m / min with an oscillation frequency of 117 strokes per minute. Figure 4 corresponds to a profile obtained by solidification against the wall of an ingot mold equipped with an insert according to the invention, and Figure 5 corresponds to an equivalent profile obtained with a conventional ingot mold without insert.
Il apparaît clairement que l'utilisation d'un insert diminue notablement la profondeur des rides d'oscillation à la surface du produit, et améliore leur régularité. On a observé lors d'essais réalisés dans des conditions de coulée analogues, une diminution systématique de 25 à 40 % de la profondeur des rides d'oscillation.It is clear that the use of an insert significantly reduces the depth of oscillation wrinkles on the surface of the product, and improves their regularity. During tests carried out under similar casting conditions, a systematic reduction of 25 to 40% in the depth of the oscillation wrinkles has been observed.
D'autres essais réalisés avec des brames d'acier moyen carbone (c'est-à-dire à teneur en carbone voisine de 0,1 %) coulées à une vitesse de 0,8 m/min avec une fréquence d'oscillation de 80 coups par minute, ont permis de mettre en évidence la différence de structure de solidification de la première peau d'une brame selon qu'elle est solidifiée dans une lingotière sans insert conforme à l'invention.Other tests carried out with medium-carbon steel slabs (that is to say with a carbon content close to 0.1%) cast at a speed of 0.8 m / min with an oscillation frequency of 80 strokes per minute made it possible to highlight the difference in the solidification structure of the first skin of a slab according to whether it is solidified in a mold without insert in accordance with the invention.
L'observation d'échantillons prélevés longitudinalement dans lesdites brames et attaqués par le réactif de Bechet-Beaugeard, révèle que, dans le cas de la lingotière conventionnelle sans insert, les rides sont profondes et se prolongent par une hétérogénéité de solidification résultant de la formation de la corne solidifiée au niveau du ménisque. La profondeur de la corne solidifiée est lors d'environ 1,7 mm. Dans le cas de la lingotière avec insert selon l'invention, les rides apparaîssent beaucoup moins marquées et la profondeur de pénétration de la corne solidifiée n'est que de 0,9 mm soit environ la moitié seulement de la valeur observée en l'absence d'insert.The observation of samples taken longitudinally in said slabs and attacked by the Bechet-Beaugeard reagent, reveals that, in the case of the conventional ingot mold without insert, the wrinkles are deep and are prolonged by a heterogeneity of solidification resulting from the formation solidified horn at the meniscus. The depth of the solidified horn is then about 1.7 mm. In the case of the ingot mold with insert according to the invention, the wrinkles appear much less marked and the depth of penetration of the solidified horn is only 0.9 mm or about half only the value observed in the absence of an insert.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation et aux applications décrites ci-dessus à titre d'exemple. En particulier les dimensions de l'insert peuvent être adaptées aux lingotières et produits coulés. Les paramètres de coulée (vitesse d'extraction, fréquence des oscillations) peuvent être adaptés et la lingotière selon l'invention peut être utilisée aussi bien en coulée continue de brames que d'autres produits (blooms).Of course, the invention is not limited to the embodiments and to the applications described above by way of example. In particular, the dimensions of the insert can be adapted to the molds and cast products. The casting parameters (extraction speed, frequency of oscillations) can be adapted and the mold according to the invention can be used both for continuous casting of slabs and other products (blooms).
Claims (5)
- Vertical or substantially vertical ingot mould for continuous casting of molten metals, such as steel, made from copper or copper alloy, the walls of which, energetically cooled by contact with a circulating cooling liquid, comprise at their upper part an insert made from a material with a thermal conductivity which is less than that of copper or of copper alloy, intended to slow down thermal exchanges at the level of the meniscus between the cast metal and the ingot mould, characterized in that the said insert, from 10 to 20 cm in length approximately, consists of a deposition of a refractory material (3, 3') with a thermal conductivity which is less than 20 w.m-¹K-¹, having a good resistance to thermal shocks, such as alumina, zirconia, boron nitride or chromium carbide, and whose thickness, taken between approximately 200 and 500 µm, is chosen such that, at the temperature of contact of the metal with the said deposited material, the said metal which is in the process of solidification has a solid fraction of between 25 and 35% approximately by weight.
- Ingot mould according to Claim 1, characterized in that the refractory material (3,3') has a melting temperature greater than 1800°C.
- Ingot mould according to Claim 1 or 2, characterized in that the refractory material (3, 3') has a thermal conductivity of less than 10 W.m-¹K-¹.
- Ingot mould according to any one of the preceding claims, characterized in that the deposition of refractory material (3, 3') is obtained by hot spraying of pulverulent material.
- Ingot mould according to Claim 4, characterized in that the deposition is performed by means of a detonation gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT86440098T ATE62159T1 (en) | 1985-11-15 | 1986-11-06 | CONTINUOUS CASTING MOLD WITH HOT HOOD. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8516954 | 1985-11-15 | ||
| FR8516954A FR2590188B1 (en) | 1985-11-15 | 1985-11-15 | CONTINUOUS CASTING LINGOTIERE WITH HOT HEAD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0228335A1 EP0228335A1 (en) | 1987-07-08 |
| EP0228335B1 true EP0228335B1 (en) | 1991-04-03 |
Family
ID=9324879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86440098A Expired - Lifetime EP0228335B1 (en) | 1985-11-15 | 1986-11-06 | Continuous-casting mould with a hot top |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0228335B1 (en) |
| JP (1) | JPS62118948A (en) |
| AT (1) | ATE62159T1 (en) |
| CA (1) | CA1310170C (en) |
| DE (1) | DE3678549D1 (en) |
| ES (1) | ES2021609B3 (en) |
| FR (1) | FR2590188B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9106106U1 (en) * | 1991-04-27 | 1992-08-27 | Foseco GmbH, 4280 Borken | Use for containers or pipes carrying molten metal |
| GB9621427D0 (en) | 1996-10-15 | 1996-12-04 | Davy Distington Ltd | Continuous casting mould |
| DE10256751B4 (en) | 2002-10-17 | 2019-09-12 | Sms Group Gmbh | Continuous casting mold for casting strands of metals, in particular of steel materials |
| US20060070716A1 (en) * | 2004-10-04 | 2006-04-06 | Russel Nippert | Method and system for continuously casting copper alloys |
| RU2677560C2 (en) * | 2014-10-28 | 2019-01-17 | ДжФЕ СТИЛ КОРПОРЕЙШН | Mold for continuous casting machine and continuous casting method for steel |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1517577A (en) * | 1967-04-05 | 1968-03-15 | Ducommun Inc | Advanced ingot mold |
| FR2041714A1 (en) * | 1969-05-09 | 1971-02-05 | Inst Chernoi Metallurgii | Ingot mould for continuous steel casting |
| JPS5973153A (en) * | 1982-10-21 | 1984-04-25 | Mishima Kosan Co Ltd | Mold for continuous casting and its production |
| JPS5973152A (en) * | 1982-10-21 | 1984-04-25 | Mishima Kosan Co Ltd | Mold for continuous casting and its production |
| JPS59147751A (en) * | 1983-02-09 | 1984-08-24 | Sumitomo Electric Ind Ltd | Continuous casting and rolling method |
| JPS59153550A (en) * | 1983-02-23 | 1984-09-01 | Kawasaki Steel Corp | Mold for continuous casting |
| DE3415050A1 (en) * | 1984-04-21 | 1985-10-31 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | METHOD FOR PRODUCING A CONTINUOUS CASTING CHILL WITH A WEAR-RESISTANT LAYER |
-
1985
- 1985-11-15 FR FR8516954A patent/FR2590188B1/en not_active Expired
-
1986
- 1986-11-06 ES ES86440098T patent/ES2021609B3/en not_active Expired - Lifetime
- 1986-11-06 DE DE8686440098T patent/DE3678549D1/en not_active Expired - Lifetime
- 1986-11-06 EP EP86440098A patent/EP0228335B1/en not_active Expired - Lifetime
- 1986-11-06 AT AT86440098T patent/ATE62159T1/en not_active IP Right Cessation
- 1986-11-14 CA CA000522961A patent/CA1310170C/en not_active Expired - Fee Related
- 1986-11-15 JP JP61272750A patent/JPS62118948A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| "Metallurgical Transactions", Vol. 15 B, Sept. 84, S. 493-509 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2590188B1 (en) | 1988-07-29 |
| CA1310170C (en) | 1992-11-17 |
| JPS62118948A (en) | 1987-05-30 |
| FR2590188A1 (en) | 1987-05-22 |
| ATE62159T1 (en) | 1991-04-15 |
| DE3678549D1 (en) | 1991-05-08 |
| EP0228335A1 (en) | 1987-07-08 |
| ES2021609B3 (en) | 1991-11-16 |
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