EP0911095B2 - Mould for continuous casting machine - Google Patents

Mould for continuous casting machine Download PDF

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Publication number
EP0911095B2
EP0911095B2 EP98119000A EP98119000A EP0911095B2 EP 0911095 B2 EP0911095 B2 EP 0911095B2 EP 98119000 A EP98119000 A EP 98119000A EP 98119000 A EP98119000 A EP 98119000A EP 0911095 B2 EP0911095 B2 EP 0911095B2
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EP
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Prior art keywords
mold
plating
mould
coating
nickel
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EP98119000A
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German (de)
French (fr)
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EP0911095A1 (en
EP0911095B1 (en
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Dirk Dr. Rode
Hector Villanueva
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KM Europa Metal AG
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KM Europa Metal AG
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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
    • B22D11/055—Cooling the moulds
    • 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 mold for a continuous casting with a shaping mold body made of a material of high thermal conductivity, such as copper or a copper alloy.
  • Molds are used to make solid profiles in a continuous casting process.
  • the mold is one of the most important components of a continuous casting plant. In it, the solidification of the melt begins.
  • the basic structure usually consists of an outer steel construction and the actual forming part of the mold, the Kokillenanalysis.
  • the Kokillenanalysis consists today almost exclusively of copper or a copper alloy.
  • the steel jacket has the task of positioning the mold body and ensuring the necessary water circulation for cooling.
  • the DD-A-3536 discloses a continuous casting mold with a layer of a material having a lower thermal conductivity than the mold material.
  • the layer is provided on the outer wall of the mold and may be made of scale or be designed as an electrolytically generated oxide layer.
  • the DE-C-969000 describes a continuous casting mold having a mold wall which has one or more layers of a poorer heat-conducting material in its lower cooling region.
  • This lower layer can be made of iron.
  • US-A-4450893 includes a prior art continuous casting mold with a heat-insulating tape on the outside. This band should be provided specifically in a locally narrow area on the outer wall, in which typically sudden changes in heat flow occur.
  • the DE-A-3142196 discloses a continuous casting mold with an inner coating of the mold cavity.
  • the coating should be provided in the lower region of the mold, since here the hardened shell of the strand wears the inner wall mechanically.
  • the FR-A-2067289 describes a coating or a partial coating of the inner mold cavity.
  • inserts are used which line the inner mold cavity, at least in the area of the bathroom mirror.
  • the invention is therefore based on the prior art, the object to provide a mold body, in which the heat dissipation is reduced, especially in the Gelloapttik Switzerland and a better strand quality can be achieved.
  • a first solution to this problem consists of the invention in the features listed in the characterizing part of claim 1.
  • the main point of the invention is the measure to reduce the heat dissipation in the mold body by a coating on the outside, wherein the coating is applied to a beginning of the pouring end portion in the height range of the mold level.
  • the coating consists of a material with a lower thermal conductivity compared to the material of the mold body and of nickel or a nickel alloy. This results in a procedurally desired reduced heat flow in the molten metal. The resulting higher temperatures have a positive effect on the quality of the strand surface and the structure quality.
  • the shrinkage behavior of the material to be cast can be specifically taken into account.
  • the heat dissipation in the casting direction increases.
  • the effective tuning of the cooling distance available in the mold for the solidification can take place with regard to the shrinkage behavior of the strand.
  • the reduction of the thickness of the outer coating can be linear or stepped.
  • the thickness and length of the outer coating is matched to the respective casting and installation parameters.
  • the mold body can be a one-part mold tube or a multi-part mold, for example a plate mold.
  • a second independent solution of the problem can be seen in the features of claim 2.
  • the existing nickel or nickel alloy coating is provided on the outside of the mold body and decreases linearly from the front end to the foot end.
  • the shrinkage behavior of the material to be cast can be specifically taken into account.
  • the heat dissipation in the casting direction increases.
  • the effective tuning of the cooling distance available in the mold for the solidification can take place with regard to the shrinkage behavior of the strand.
  • the coating is applied only to a part of the circumference of the mold body. This measure is particularly suitable for non-rotationally symmetrical Kokillenkörpem. For adjustment molds, it may be advantageous, for example, to provide only the longitudinal plates with an outer coating.
  • the targeted coating can be a disproportionate shrinkage of the strand in individual areas, for example, in corner areas are avoided. This ensures that the heat transfer over the entire circumference of the strand is approximately uniform, so that over the entire cross-section of the strand, a strand shell growing uniformly in thickness is achieved.
  • a high quality and economical coating can be applied galvanically (claim 4). It is also possible to apply the coating as a thermal spray coating, as provided in claim 5.
  • Nickel materials have already proven themselves as material for the inner wear protection layer. Frequently, therefore, users also have options for nickel-casting mold bodies.
  • Nickel has more than four times lower thermal conductivity than copper. Accordingly, by an outer coating of nickel, an effective reduction of heat dissipation and thus an increase in the temperature in the G screenador Bachelor Scheme be effected.
  • Nickel can be applied both as a galvanic coating and as a metal spray coating.
  • the Kokillenanalysis can be coated on the outside completely or only locally in G faux Spiegel Kunststoff.
  • FIGS. 1 to 3 three different embodiments of a Kokillen emotionss are shown in the form of a mold tube in vertical longitudinal section.
  • the FIG. 1 illustrates a mold tube 1 for the continuous casting of steel.
  • the mold tube 1 has a mold cavity 2, whose cross-section is dimensioned at the pouring end 3 greater than at the strand outlet side foot 4.
  • the main body 5 of the mold tube 1 consists of a copper alloy, preferably based on copper / chromium / zirconium (CuCrZr).
  • the mold tube 1 On the outer side 6, the mold tube 1 has a coating 8 on a section A in the height range of the casting mirror 7.
  • the coating 8 consists of a material with a relation to the material of the mold tube 1 and the base body 5 lower thermal conductivity.
  • nickel is well suited as a material for the outer coating 8. Nickel can be applied both as a galvanic coating and as a thermal metal spray coating.
  • the coating 8 reduces the heat flow and thus the heat dissipation of the mold tube 1 in the height range of the casting mirror 7. This results in higher wall temperatures in the initial phase of strand shell training. This leads to an improvement in the surface quality of a steel strand. In particular, micro-cracks near the edge of the mold tube 1 can be avoided in this way.
  • the coating 8 has a casting direction G approximately constant thickness D 1 . In the transition region 9, the coating 8 tapers continuously to the outside 6.
  • the mold tube 1 is provided with a wear protection layer 11 of chromium, which is about 80 microns thick.
  • FIG. 2 Another embodiment of a mold tube 12 is in the FIG. 2 shown. This has at the pouring end 13 has an outer coating 14 to reduce heat dissipation.
  • the coating 14 extends over the height range of the casting mirror 15, whereby the thickness D 2 of the coating 14 in the casting direction G is reduced.
  • One possible embodiment of the coating 14 provides a thickness D 2 which decreases from 3 mm to 1 mm and has a transition area 16 which is continuous at the end.
  • a section of a further variant of a mold tube 17 shows FIG. 3 ,
  • the mold tube 17 has a coating 18 on the outer side 19, the thickness D 3 decreases linearly from the front end 20 to the foot 21.
  • the coating 18 the heat dissipation in the mold tube 17 is reduced.
  • the heat flow increases in total from the front end 20 of the mold tube 17 to the foot 21 towards.
  • the mold body of a mold according to the invention does not necessarily have to be a mold tube.
  • the invention is equally advantageous in multi-part configured molds, such as plate molds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

The mold body (1) is provided at least over certain sections with an outer cover (8) consisting of a material whose thermal conductivity is lower than that of the material of the mold body.

Description

Die Erfindung betrifft eine Kokille für eine Stranggießanlage mit einem formgebenden Kokillenkörper aus einem Material hoher Wärmeleitfähigkeit, wie Kupfer oder einer Kupferlegierung.The invention relates to a mold for a continuous casting with a shaping mold body made of a material of high thermal conductivity, such as copper or a copper alloy.

Kokillen werden zur Herstellung von Vollprofilen in einem kontinuierlichen Gießprozess verwendet. Die Kokille ist eines der wichtigsten Bauteile einer Stranggießanlage. In ihr beginnt die Erstarrung der Schmelze.Molds are used to make solid profiles in a continuous casting process. The mold is one of the most important components of a continuous casting plant. In it, the solidification of the melt begins.

Der prinzipielle Aufbau besteht in der Regel aus einer äußeren Stahlkonstruktion und dem eigentlichen formgebenden Teil der Kokille, dem Kokillenkörper. Der Kokillenkörper besteht heute fast ausschließlich aus Kupfer oder einer Kupferlegierung. Der Stahlmantel hat die Aufgabe, den Kokillenkörper zu positionieren und den zur Kühlung erforderlichen Wasserkreislauf sicherzustellen.The basic structure usually consists of an outer steel construction and the actual forming part of the mold, the Kokillenkörper. The Kokillenkörper consists today almost exclusively of copper or a copper alloy. The steel jacket has the task of positioning the mold body and ensuring the necessary water circulation for cooling.

Aus Gründen des Verschleißschutzes wird der Kokillenköper mit einer inneren Beschichtung aus einem verschleißfesten Werkstoff, wie Nickel oder Chrom, versehen. Eine solche Stranggießkokille mit Verschleißschutzschicht geht beispielsweise aus der DE 31 42 196 C2 hervor. Hierdurch kann eine Verbesserung des Reibverhaltens und damit eine Erhöhung der Standzeit des Kokillenkörpers erreicht werden.For reasons of wear protection of Kokillenköper is provided with an inner coating of a wear-resistant material, such as nickel or chromium. Such a continuous casting mold with wear protection layer is for example from the DE 31 42 196 C2 out. As a result, an improvement in the friction behavior and thus an increase in the service life of the mold body can be achieved.

Infolge der Kühlung des flüssigen Stahls im Kokillenkörper erstarrt dieser in den Randbereichen unter Bildung einer in der Dicke permanent anwachsenden Strangschale. Hierbei kommt es zu einer Veränderung der Querschnittsgeometrie des Strangs durch Schrumpfung.As a result of the cooling of the liquid steel in the mold body, it solidifies in the edge regions to form a strand shell which permanently increases in thickness. This leads to a change in the cross-sectional geometry of the strand due to shrinkage.

Neben der Formgebung des Strangs hat der Kokillenkörper somit die wesentliche Aufgabe, durch eine kontinuierliche Wärmeabfuhr die Ausbildung einer ausreichend dicken widerstandsfähigen und fehlerfreien Strangschale zu gewährleisten.In addition to the shape of the strand of the mold body thus has the essential task to ensure the formation of a sufficiently thick resistant and error-free strand shell by a continuous heat dissipation.

Andererseits wirkt sich eine zu starke Wärmeabfuhr und damit Kühlung der Stahlschmelze zu Beginn des Erstarrungsvorgangs, insbesondere im Gießspiegelbereich, nachteilig auf die Oberflächenqualität des Strangs aus. Es kann dann zu Mikrorissen in der Oberfläche und Gefügefehlern kommen. Diese bilden sich insbesondere in Kantennähe des Kokillenkörpers aus. Ferner besteht die Gefahr, dass der Strang in dem sich verjüngenden Kokillenkörper verklemmt.On the other hand, excessive heat removal and thus cooling of the molten steel at the beginning of the solidification process, in particular in the molten metal region, has an adverse effect on the surface quality of the strand. It can then lead to microcracks in the surface and microstructural defects. These form in particular near the edge of the Kokillenkörpers. Furthermore, there is a risk that the strand is jammed in the tapered mold body.

Um eine Reduzierung der Wärmeabfuhr im Gießspiegelbereich zu erreichen, ist es bekannt, die Schmelze im Kokillenkörper elektromagnetisch zu rühren. Dieses Verfahren ist jedoch vergleichsweise aufwendig. Des weiteren hat man versucht, eine Reduzierung der Wärmeabfuhr durch Vertikalschlitze in der Innenwand des Kokillenkörpers oder durch Einsätze aus feuerfestem Material zu erreichen.In order to achieve a reduction of the heat dissipation in the Gießspiegelbereich, it is known to stir the melt in the mold body electromagnetically. However, this method is relatively expensive. Furthermore, attempts have been made to achieve a reduction in heat dissipation through vertical slots in the inner wall of the mold body or by inserts of refractory material.

Ferner hat man Versuche mit dickeren inneren Verschleißschutzschichten angestellt. Durch die unterschiedlichen Wärmeausdehnungskoeffizienten der Werkstoffe von Kokillenkörpern, meist Kupfer, und der Verschleißschutzschicht, meist Nickel, kommt es jedoch zu erheblichen Spannungen in der Verschleißschutzschicht. Hierunter leidet die Haftung und es besteht die Gefahr der Ausbildung von Rissen.Furthermore, attempts have been made with thicker inner wear protection layers. Due to the different coefficients of thermal expansion of the materials of mold bodies, usually copper, and the wear protection layer, usually nickel, however, there are considerable stresses in the wear protection layer. This suffers the liability and there is a risk of the formation of cracks.

Die DD-A-3536 offenbart eine Stranggießkokille mit einer Schicht aus einem Werkstoff, der eine geringere Wärmeleitfähigkeit als der Kokillenwerkstoff besitzt. Die Schicht ist an der Außenwand der Kokille vorgesehen und kann aus Kesselstein bestehen oder als elektrolytisch erzeugte Oxidschicht ausgeführt sein.The DD-A-3536 discloses a continuous casting mold with a layer of a material having a lower thermal conductivity than the mold material. The layer is provided on the outer wall of the mold and may be made of scale or be designed as an electrolytically generated oxide layer.

Die DE-C-969000 beschreibt eine Stranggießkokille mit einer Formwand, die in ihrem unteren Kühlbereich eine oder mehrere Schichten aus einem schlechter wärmeleitenden Material aufweist. Diese untere Schicht kann aus Eisen bestehen.The DE-C-969000 describes a continuous casting mold having a mold wall which has one or more layers of a poorer heat-conducting material in its lower cooling region. This lower layer can be made of iron.

Im Umfang der US-A-4450893 zählt eine Stranggießkokille zum Stand der Technik mit einem wärmeisolierenden Band auf der Außenseite. Diese Band soll gezielt in einem lokal eng begrenzten Bereich an der Außenwand vorgesehen sein, in dem typischerweise plötzlich Änderungen im Wärmefluss auftreten.In the scope of US-A-4450893 includes a prior art continuous casting mold with a heat-insulating tape on the outside. This band should be provided specifically in a locally narrow area on the outer wall, in which typically sudden changes in heat flow occur.

Die DE-A-3142196 offenbart eine Stranggussform mit einer inneren Beschichtung des Formhohlraums. Hierbei soll die Beschichtung im unteren Bereich der Form vorgesehen sein, da hier die gehärtete Schale des Strangs die Innenwand mechanisch verschleißt.The DE-A-3142196 discloses a continuous casting mold with an inner coating of the mold cavity. Here, the coating should be provided in the lower region of the mold, since here the hardened shell of the strand wears the inner wall mechanically.

Auch die FR-A-2067289 beschreibt eine Beschichtung bzw. eine teilweise Beschichtung des inneren Formhohlraums. Hierbei kommen Einsätze zum Einsatz, die zumindest im Badspiegelbereich den inneren Formhohlraum auskleiden.Also the FR-A-2067289 describes a coating or a partial coating of the inner mold cavity. In this case, inserts are used which line the inner mold cavity, at least in the area of the bathroom mirror.

Der Erfindung liegt daher ausgehend vom Stand der Technik die Aufgabe zugrunde, einen Kokillenkörper zu schaffen, bei dem die Wärmeabfuhr insbesondere im Gießspiegelbereich reduziert ist und eine bessere Strangqualität erzielt werden kann.The invention is therefore based on the prior art, the object to provide a mold body, in which the heat dissipation is reduced, especially in the Gießspiegelbereich and a better strand quality can be achieved.

Eine erste Lösung dieser Aufgabe besteht nach der Erfindung in den im kennzeichnenden Teil des Anspruchs 1 aufgeführten Merkmalen.A first solution to this problem consists of the invention in the features listed in the characterizing part of claim 1.

Kernpunkt der Erfindung bildet die Maßnahme, die Wärmeabfuhr im Kokillenkörper durch eine Beschichtung auf der Außenseite zu reduzieren, wobei die Beschichtung auf einem am eingießseitigen Stirnende beginnenden Teilstück im Höhenbereich des Gießspiegels aufgebracht ist. Die Beschichtung besteht aus einem Material mit einer gegenüber dem Werkstoff des Kokillenkörpers niedrigeren Wärmeleitfähigkeit und zwar aus Nickel oder einer Nickellegierung. Daraus ergibt sich ein verfahrenstechnisch angestrebter reduzierter Wärmefluss im Gießspiegelbereich. Die hieraus resultierenden höheren Temperaturen wirken sich positiv auf die Qualität der Strangoberfläche und die Gefügequalität aus.The main point of the invention is the measure to reduce the heat dissipation in the mold body by a coating on the outside, wherein the coating is applied to a beginning of the pouring end portion in the height range of the mold level. The coating consists of a material with a lower thermal conductivity compared to the material of the mold body and of nickel or a nickel alloy. This results in a procedurally desired reduced heat flow in the molten metal. The resulting higher temperatures have a positive effect on the quality of the strand surface and the structure quality.

Durch eine Beschichtung, bei der die Dicke in Gießrichtung abnimmt, kann dem Schrumpfverhalten des zu vergießenden Werkstoffs gezielt Rechnung getragen werden. Hierbei nimmt die Wärmeabfuhrleistung in Gießrichtung zu. Auf diese Weise kann die effektive Abstimmung der für die Erstarrung zur Verfügung stehenden Kühlstrecke in der Kokille hinsichtlich des Schrumpfverhaltens des Strangs erfolgen.By a coating in which the thickness decreases in the casting direction, the shrinkage behavior of the material to be cast can be specifically taken into account. Here, the heat dissipation in the casting direction increases. In this way, the effective tuning of the cooling distance available in the mold for the solidification can take place with regard to the shrinkage behavior of the strand.

Die Verringerung der Dicke der äußeren Beschichtung kann linear oder stufenförmig erfolgen.The reduction of the thickness of the outer coating can be linear or stepped.

Auf diese Weise kann gezielt im Gießspiegelbereich eine Reduzierung der Wärmeabfuhr realisiert werden. Damit wird ein Überschreiten der Strangschalenfestigkeit vermieden.In this way, a reduction in heat dissipation can be realized specifically in Gießspiegelbereich. This avoids exceeding the strand shell strength.

Die Dicke und Länge der äußeren Beschichtung wird auf die jeweiligen Gieß- und Anlagenparameter abgestimmt.The thickness and length of the outer coating is matched to the respective casting and installation parameters.

Bei dem Kokillenkörper kann es sich grundsätzlich um ein einteiliges Kokillenrohr oder um eine mehrteilige Gießform, beispielsweise eine Plattenkokille, handeln.In principle, the mold body can be a one-part mold tube or a multi-part mold, for example a plate mold.

Eine zweite eigenständige Lösung der Aufgabe ist in den Merkmalen von Anspruch 2 zu sehen. Danach ist die aus Nickel oder einer Nickellegierung bestehende Beschichtung an der Außenseite des Kokillenkörpers vorgesehen und nimmt vom Stirnende zum Fußende hin linear ab. Durch eine solche Ausführung der Beschichtung kann dem Schrumpfverhalten des zu vergießenden Werkstoffs gezielt Rechnung getragen werden. Hierbei nimmt die Wärmeabfuhrleistung in Gießrichtung zu. Auf diese Weise kann die effektive Abstimmung der für die Erstarrung zur Verfügung stehenden Kühlstrecke in der Kokille hinsichtlich des Schrumpfverhaltens des Strangs erfolgen.A second independent solution of the problem can be seen in the features of claim 2. Thereafter, the existing nickel or nickel alloy coating is provided on the outside of the mold body and decreases linearly from the front end to the foot end. By such an embodiment of the coating, the shrinkage behavior of the material to be cast can be specifically taken into account. Here, the heat dissipation in the casting direction increases. In this way, the effective tuning of the cooling distance available in the mold for the solidification can take place with regard to the shrinkage behavior of the strand.

Nach den Merkmalen des Anspruchs 3 ist die Beschichtung nur auf einem Teil des Umfangs des Kokillenkörpers aufgebracht. Diese Maßnahme bietet sich insbesondere bei nicht rotationssymmetrischen Kokillenkörpem an. Bei Verstellkokillen kann es beispielsweise vorteilhaft sein, nur die Längsplatten mit einer äußeren Beschichtung zu versehen.According to the features of claim 3, the coating is applied only to a part of the circumference of the mold body. This measure is particularly suitable for non-rotationally symmetrical Kokillenkörpem. For adjustment molds, it may be advantageous, for example, to provide only the longitudinal plates with an outer coating.

Durch die gezielte Beschichtung kann ein überproportionales Schrumpfen des Strangs in einzelnen Bereichen, beispielsweise in Eckbereichen, vermieden werden. So wird gewährleistet, dass der Wärmeübergang über den gesamten Umfang des Strangs annähernd gleichmäßig ist, so dass über den gesamten Querschnitt des Strangs eine in der Dicke gleichmäßig anwachsende Strangschale erzielt wird.The targeted coating can be a disproportionate shrinkage of the strand in individual areas, for example, in corner areas are avoided. This ensures that the heat transfer over the entire circumference of the strand is approximately uniform, so that over the entire cross-section of the strand, a strand shell growing uniformly in thickness is achieved.

Eine qualitativ hochwertige und wirtschaftliche Beschichtung kann galvanisch aufgebracht werden (Anspruch 4). Möglich ist es auch, die Beschichtung als thermische Spritzschicht aufzubringen, wie dies Anspruch 5 vorsieht.A high quality and economical coating can be applied galvanically (claim 4). It is also possible to apply the coating as a thermal spray coating, as provided in claim 5.

Nickelwerkstoffe haben sich bereits als Werkstoff für die innere Verschleißschutzschicht bewährt. Häufig sind daher bei den Anwendern auch Möglichkeiten zum Vernickeln von Kokillenkörpern gegeben.Nickel materials have already proven themselves as material for the inner wear protection layer. Frequently, therefore, users also have options for nickel-casting mold bodies.

Nickel hat gegenüber Kupfer eine mehr als vierfach geringere Wärmeleitfähigkeit. Dementsprechend kann durch eine äußere Beschichtung aus Nickel eine wirksame Reduzierung der Wärmeabfuhr und damit eine Erhöhung der Temperatur im Gießspiegelbereich bewirkt werden.Nickel has more than four times lower thermal conductivity than copper. Accordingly, by an outer coating of nickel, an effective reduction of heat dissipation and thus an increase in the temperature in the Gießspiegelbereich be effected.

Nickel kann sowohl als galvanischer Überzug als auch als Metall-Spritzüberzug aufgebracht werden. Hierbei kann der Kokillenkörper auf der Außenseite vollständig oder nur örtlich im Gießspiegelbereich beschichtet werden.Nickel can be applied both as a galvanic coating and as a metal spray coating. Here, the Kokillenkörper can be coated on the outside completely or only locally in Gießspiegelbereich.

Da die Verschleißfestigkeit von Kupfer bzw. Kupferlegierungen, welche als Werkstoff für den Kokillenkörper zum Einsatz gelangen, relativ gering ist, kann es in Abhängigkeit vom Anwendungsfall zweckmäßig sein, den Kokillenkörper in bekannter Weise mit einer Innenbeschichtung zu versehen (Anspruch 6). Hier haben sich Innenbeschichtungen aus Nickel, Chrom oder überchromten Nickelauflagen bewährt.Since the wear resistance of copper or copper alloys, which are used as a material for the mold body, is relatively low, it may be appropriate depending on the application to provide the mold body in a known manner with an inner coating (claim 6). Here, interior coatings made of nickel, chrome or chrome-plated nickel plating have proven themselves.

Die Erfindung ist nachfolgend anhand von in den Zeichnungen dargestellten Ausführungsbeispielen beschrieben. In den Figuren 1 bis 3 sind drei unterschiedliche Ausführungsformen eines Kokillenkörpers in Form eines Kokillenrohrs im vertikalen Längsschnitt dargestellt.The invention is described below with reference to embodiments shown in the drawings. In the FIGS. 1 to 3 three different embodiments of a Kokillenkörpers are shown in the form of a mold tube in vertical longitudinal section.

Die Figur 1 veranschaulicht ein Kokillenrohr 1 zum Stranggießen von Stahl. Das Kokillenrohr 1 besitzt einen Formhohlraum 2, dessen Querschnitt am eingießseitigen Stirnende 3 größer als am strangaustrittsseitigen Fußende 4 bemessen ist.The FIG. 1 illustrates a mold tube 1 for the continuous casting of steel. The mold tube 1 has a mold cavity 2, whose cross-section is dimensioned at the pouring end 3 greater than at the strand outlet side foot 4.

Der Grundkörper 5 des Kokillenrohrs 1 besteht aus einer Kupferlegierung, vorzugsweise auf Kupfer/Chrom/Zirkon-Basis (CuCrZr).The main body 5 of the mold tube 1 consists of a copper alloy, preferably based on copper / chromium / zirconium (CuCrZr).

An der Außenseite 6 weist das Kokillenrohr 1 auf einem Teilstück A im Höhenbereich des Gießspiegels 7 eine Beschichtung 8 auf. Die Beschichtung 8 besteht aus einem Werkstoff mit einer gegenüber dem Werkstoff des Kokillenrohrs 1 bzw. dem Grundkörper 5 niedrigeren Wärmeleitfähigkeit. Insbesondere Nickel ist als Werkstoff für die äußere Beschichtung 8 gut geeignet. Nickel kann sowohl als galvanischer Überzug als auch als thermische Metall-Spritzschicht aufgebracht werden.On the outer side 6, the mold tube 1 has a coating 8 on a section A in the height range of the casting mirror 7. The coating 8 consists of a material with a relation to the material of the mold tube 1 and the base body 5 lower thermal conductivity. In particular, nickel is well suited as a material for the outer coating 8. Nickel can be applied both as a galvanic coating and as a thermal metal spray coating.

Die Beschichtung 8 reduziert den Wärmefluss und damit die Wärmeabfuhr des Kokillenrohrs 1 im Höhenbereich des Gießspiegels 7. Hieraus resultieren höhere Wandtemperaturen in der Anfangsphase der Strangschalenausbildung. Dies führt zu einer Verbesserung der Oberflächenqualität eines Stahlstrangs. Insbesondere Mikrorisse in Kantennähe des Kokillenrohrs 1 können auf diese Weise vermieden werden.The coating 8 reduces the heat flow and thus the heat dissipation of the mold tube 1 in the height range of the casting mirror 7. This results in higher wall temperatures in the initial phase of strand shell training. This leads to an improvement in the surface quality of a steel strand. In particular, micro-cracks near the edge of the mold tube 1 can be avoided in this way.

Wie in der Figur 1 in einer nicht erfindungsgemäßen Ausführungsform zu erkennen ist, weist die Beschichtung 8 eine in Gießrichtung G annähernd konstante Dicke D1 auf. Im Übergangsbereich 9 verjüngt sich die Beschichtung 8 kontinuierlich zur Außenseite 6.Like in the FIG. 1 can be seen in a non-inventive embodiment, the coating 8 has a casting direction G approximately constant thickness D 1 . In the transition region 9, the coating 8 tapers continuously to the outside 6.

Auf der Innenseite 10 ist das Kokillenrohr 1 mit einer Verschleißschutzschicht 11 aus Chrom versehen, die ca. 80 µm dick ist.On the inside 10, the mold tube 1 is provided with a wear protection layer 11 of chromium, which is about 80 microns thick.

Eine andere Ausführungsform eines Kokillenrohrs 12 ist in der Figur 2 dargestellt. Dieses besitzt am eingießseitigen Stirnende 13 eine äußere Beschichtung 14 zur Reduzierung der Wärmeabfuhr. Die Beschichtung 14 erstreckt sich über den Höhenbereich des Gießspiegels 15, wobei sich die Dicke D2 der Beschichtung 14 in Gießrichtung G verringert. Eine mögliche Ausführung der Beschichtung 14 sieht eine sich von 3 mm auf 1 mm verringernde Dicke D2 vor mit einem endseitig kontinuierlichen Übergangsbereich 16.Another embodiment of a mold tube 12 is in the FIG. 2 shown. This has at the pouring end 13 has an outer coating 14 to reduce heat dissipation. The coating 14 extends over the height range of the casting mirror 15, whereby the thickness D 2 of the coating 14 in the casting direction G is reduced. One possible embodiment of the coating 14 provides a thickness D 2 which decreases from 3 mm to 1 mm and has a transition area 16 which is continuous at the end.

Einen Ausschnitt aus einer weiteren Variante eines Kokillenrohrs 17 zeigt Figur 3. Das Kokillenrohr 17 weist eine Beschichtung 18 an der Außenseite 19 auf, deren Dicke D3 vom Stirnende 20 zum Fußende 21 linear abnimmt. Durch die Beschichtung 18 wird die Wärmeabfuhr im Kokillenrohr 17 reduziert. Der Wärmefluss nimmt jedoch insgesamt vom Stirnende 20 des Kokillenrohrs 17 zum Fußende 21 hin zu.A section of a further variant of a mold tube 17 shows FIG. 3 , The mold tube 17 has a coating 18 on the outer side 19, the thickness D 3 decreases linearly from the front end 20 to the foot 21. By the coating 18, the heat dissipation in the mold tube 17 is reduced. However, the heat flow increases in total from the front end 20 of the mold tube 17 to the foot 21 towards.

Der Kokillenkörper einer erfindungsgemäßen Kokille muss nicht zwingend ein Kokillenrohr sein. Die Erfindung ist gleichermaßen vorteilhaft bei mehrteilig konfigurierten Gießformen, wie Plattenkokillen.The mold body of a mold according to the invention does not necessarily have to be a mold tube. The invention is equally advantageous in multi-part configured molds, such as plate molds.

Claims (6)

  1. Mould for a continuous casting system comprising a shaped mould body (1, 12) made of a material with high thermal conductivity, such as copper or a copper alloy, wherein the mould body (1, 12) is provided in regions with an outer plating (8, 14) made of a material with a thermal conductivity which is relatively low compared to the material of the mould body (1, 12), wherein a plating (8, 14) is applied to a portion (A) starting at the front end (3, 13) on the pour-in side at the height of the meniscus (7, 15) and the plating (8, 14) consists of nickel or a nickel alloy, characterised in that the plating (14) has a thickness (D2) which decreases in the casting direction (G).
  2. Mould for a continuous casting system comprising a shaping mould body (17) made of a material with high thermal conductivity, such as copper or a copper alloy, wherein the mould body (17) is provided with an outer plating (18) made from a material with a thermal conductivity which is relatively low compared to the material of the mould body (17), characterised in that a plating (18) is provided on the outside (19) and reduces linearly from the front end (20) to the foot end (21) and the plating (18) consists of nickel or a nickel alloy.
  3. Mould according to claim 1 or 2, characterised in that the plating (8, 14, 18) is applied to part of the periphery of the mould body (1, 12, 17).
  4. Mould according to any one of claims 1 to 3, characterised in that the plating (8, 14, 18) is applied by electroplating.
  5. Mould according to any one of claims 1 to 3, characterised in that the plating (8, 14, 18) is applied as a thermal spray coating.
  6. Mould according to any one of claims 1 to 5, characterised in that the mould body (1) has an inner plating (11).
EP98119000A 1997-10-25 1998-10-08 Mould for continuous casting machine Expired - Lifetime EP0911095B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19747305A DE19747305A1 (en) 1997-10-25 1997-10-25 Mold for a continuous caster
DE19747305 1997-10-25

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EP0911095A1 EP0911095A1 (en) 1999-04-28
EP0911095B1 EP0911095B1 (en) 2004-09-22
EP0911095B2 true EP0911095B2 (en) 2010-07-21

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US (1) US5899259A (en)
EP (1) EP0911095B2 (en)
JP (1) JP4303809B2 (en)
CN (1) CN1075752C (en)
AT (1) ATE276848T1 (en)
CA (1) CA2247785C (en)
DE (2) DE19747305A1 (en)

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DE19802809A1 (en) * 1998-01-27 1999-07-29 Km Europa Metal Ag Liquid-cooled mold
DE19852473C5 (en) * 1998-11-13 2005-10-06 Sms Demag Ag Chill plate of a continuous casting plant
CN100379137C (en) * 2005-07-21 2008-04-02 南京航空航天大学 Zero valtage switch compound crisscross parallel two-tube positive shock three-level DC inverter
KR100792801B1 (en) 2006-12-15 2008-01-14 남기홍 Recycling method of tube mold
JP4659796B2 (en) * 2007-08-31 2011-03-30 三島光産株式会社 Method for repairing continuous casting mold and repaired continuous casting mold
CN101992276A (en) * 2010-12-13 2011-03-30 西南铝业（集团）有限责任公司 Aluminum alloy crystallizer
CN102069163B (en) * 2010-12-24 2013-11-13 中冶京诚工程技术有限公司 Crystallizer, device and method for producing casting blank, casting blank and casting blank with super-large section
CN102527958A (en) * 2011-12-09 2012-07-04 太原科技大学 Crystallizing device for continuous casting steel
CN102554155A (en) * 2011-12-22 2012-07-11 莱芜钢铁集团有限公司 Tubular crystallizer
CN102527959A (en) * 2011-12-22 2012-07-04 莱芜钢铁集团有限公司 Combined crystallizer
KR101443788B1 (en) * 2012-08-09 2014-09-23 주식회사 포스코 Casting mold
CN102974782B (en) * 2012-12-14 2015-01-21 莱芜钢铁集团有限公司 H-shaped tubular mold
DE102017211108A1 (en) * 2017-06-30 2019-01-03 Thyssenkrupp Ag Mold plate and mold for a continuous casting plant and continuous casting process
CN108838352B (en) * 2018-05-25 2023-08-22 中冶连铸技术工程有限责任公司 Crystallizer with double water jacket structure
CN110125350B (en) * 2019-06-04 2024-08-13 中国重型机械研究院股份公司 Multilayer composite copper plate for wide surface of slab caster crystallizer and preparation method thereof
CN118045974A (en) * 2024-02-20 2024-05-17 常熟中佳新材料有限公司 Composite structure horizontal continuous casting graphite crystallizer device

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JPS63119954A (en) † 1986-11-07 1988-05-24 Sumitomo Metal Ind Ltd Ultrasonic oscillating mold for continuous casting

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Also Published As

Publication number Publication date
EP0911095A1 (en) 1999-04-28
DE19747305A1 (en) 1999-04-29
CA2247785A1 (en) 1999-04-25
JP4303809B2 (en) 2009-07-29
US5899259A (en) 1999-05-04
CN1075752C (en) 2001-12-05
CN1215638A (en) 1999-05-05
JPH11197800A (en) 1999-07-27
EP0911095B1 (en) 2004-09-22
CA2247785C (en) 2002-11-26
ATE276848T1 (en) 2004-10-15
DE59811984D1 (en) 2004-10-28

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