EP0179364B1 - Continuous casting mold for steel billets with polygonal cross-section - Google Patents

Continuous casting mold for steel billets with polygonal cross-section Download PDF

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Publication number
EP0179364B1
EP0179364B1 EP85112893A EP85112893A EP0179364B1 EP 0179364 B1 EP0179364 B1 EP 0179364B1 EP 85112893 A EP85112893 A EP 85112893A EP 85112893 A EP85112893 A EP 85112893A EP 0179364 B1 EP0179364 B1 EP 0179364B1
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EP
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Prior art keywords
continuous casting
strand
edge
section
mold
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EP85112893A
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German (de)
French (fr)
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EP0179364A3 (en
EP0179364A2 (en
Inventor
Arthur Vaterlaus
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Concast Service Union AG
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Concast Service Union AG
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Priority to AT85112893T priority Critical patent/ATE35785T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to a continuous mold for the continuous casting of steel strands with an essentially polygonal cross-section, the mold cavity being provided with a casting cone in the strand running direction.
  • Chill molds with a four, six and polygonal cross section of the mold cavity are known. Such molds are provided with a pouring cone in the direction of the strand to compensate for the shrinkage of the solidifying strand crust.
  • the casting cone is adapted as precisely as possible to the steel quality, the casting temperature, etc., it has so far not been possible to achieve a uniform strand crust growth within the mold over the circumference.
  • the strand crust in particular in the case of large bloom and slab cross sections, can be up to 50% and more thinner at individual points than neighboring strand crust regions. If the strand crust is pulled away from the mold wall by shrinkage stresses etc. and the cooling in areas with a thin strand crust is reduced over a longer distance, breakthroughs inside or outside the mold can occur due to reheating and / or cracking.
  • the invention has for its object to eliminate the shortcomings and disadvantages described in molds according to the preamble and in particular to improve the uniformity of the strand cooling in the corner areas. This is intended to achieve an increased strand geometry and an improvement in the strand surface. Also, strand breaks that are due to uneven cooling in the mold should be avoided both inside and outside the mold. Another objective is to prevent cracks on the strand surface or internal cracks in the edge areas, which reduce the quality of the end products.
  • the continuous casting mold according to the invention it is possible to solidify a uniformly thick strand crust even in the corner areas of the strand within the mold. As a result, not only can an improved strand geometry be achieved, breakthroughs inside and outside the mold can also be avoided.
  • the uniform solidification of the strand crust further prevents the formation of edge cracks on and below the surface, which further improves the strand quality.
  • the angle reduction can take place in one or more steps.
  • the edge angle can be reduced to a greater extent along the pouring-in section and to a lesser extent along the outlet-side section.
  • Chill molds with convex and flat walls are known in the prior art. In order to achieve favorable manufacturing costs, it is recommended according to a further feature in the case of molds with an essentially rectangular mold cavity that the walls or wall sections forming the angle are designed as flat surfaces. In the case of such molds, it is additionally proposed to start with an edge angle of 90 ° in the area of the bath level, which then gradually decreases in the direction of the strand.
  • the wall formation along the edge required for the reduction in angle is advantageously only applied on one side of the edge for processing reasons.
  • the narrow side of plate molds is ideal for this.
  • the inclined surface adapted to the intended reduction in angle can, for example, only extend over a partial width in the edge region or up to the middle of the narrow side.
  • a narrow side 3 abuts two broad sides 4, 4 'which are partially shown.
  • This plate mold 2 represents a continuous mold for the continuous casting of ingots and slabs. It has a polygonal mold cavity 5 with an essentially rectangular cross section. It would also be conceivable for the mold cavity to be hexagonal or octagonal, etc.
  • the mold cavity 5 is provided with a casting cone 6 on the narrow side 3 and, for example, with a casting cone 7, 7 'on the broad sides 4, 4'.
  • the edge angles of the mold cavity 5, designated 9, 9 ' are, for example, 90 ° on the mold-side delimitation surface. They decrease in the strand running direction to edge angles 10, 10 '.
  • a strand crust 20, which has an edge angle 25, is shown shortly before it emerges from the mold.
  • dash-dot mold walls are shown with edge angles larger than angles 25, which led the strand crust 20 on its way through the mold before the cut in FIG. 2.
  • the angle 21 at the mold entrance is also 90 ° here. But it could also be larger than 90 °.
  • the angles 22, 23, 24 represent intermediate stages of the continuous angle reduction during the passage of the strand crust 20 through the mold. The angle reduction in this example is exaggerated for clearer identification.
  • Arrows 26 and 27 show tensile stresses caused by the shrinkage of the strand crust 20.
  • Arrows 29 show compressive stresses directed to a line 28, which are caused by the angle reductions 22-25.
  • the tensile stresses as represented by the arrows 26 and 27, and the tensile or shrinkage stresses which arise in the corner itself can cause cracks along the line 28.
  • the reduction in the edge angle 22-25 is therefore dimensioned such that the tensile stresses in the strand crust corner, which are generated by the shrinkage, are at least reduced, compensated or converted into compressive stresses according to the arrows 29.
  • the angle reductions 22-25 also make it possible to avoid all signs of detachment of the strand crust 20 from the cooled mold wall in the area of the corners, thereby achieving a uniform crust growth, in particular a uniform crust thickness. This prevents cracks and breakthroughs in the edge area.
  • the angular reduction becomes the dwell time of the strand crust in the mold, i.e. adjusted to the average pull-out speed.
  • the steel composition, type of cast powder slag, pouring temperature, thermal conductivity of the cooled mold wall and mold length etc. are decisive for the reduction in angle.
  • Advantageous values for the reduction of the edge angle in the case of essentially rectangular steel strands are between 0.2 ° and 4 °, preferably between 0.2 ° and 2 °. Casting speeds of approximately 1 m to 1.5 m per minute are assumed. If, for example, the edge angle reduction is chosen too large, signs of wear occur due to excessive friction between the mold wall and the strand over the height range of the angle reduction of the mold wall. If the angular reduction is too small, the inside and / or outside cracks known in the prior art occur at the edges due to detachment of the strand crust and irregular crust growth in the edge area and edge breakthroughs.
  • a narrow side wall 50 is provided with a roof-shaped surface that is different from that in FIGS. 3, 4, 5.
  • a roof is formed by surfaces 51 and in a section 55 on the outlet side by surface 52.
  • a dash-dotted line 58 a roof shape is shown as a variant which, together with a broad side on the outlet-side section 55, would result in a constant edge angle.
  • the angle reduction extends in this example only over part-width sections 59, 59 'of the mold wall.
  • a wall middle part with a width 60 is provided with a casting cone.
  • FIGS. 8 and 9 Another variant is shown in FIGS. 8 and 9, wherein a surface 80 has a pouring cone along the line 81. Below a bath level 82, an angular reduction over part length 84 is applied along line 83. The strand edge no longer deforms along the partial length 85.
  • mold cavities are shown with an essentially rectangular cross section.
  • the walls or wall sections forming the angles are formed from straight lines.
  • An example is shown in FIG. 10, in which an angle 92 on the pouring side of the mold is greater than 90 ° and an angle 90 on the exit side of the mold is 90 °.
  • a straight boundary surface 93 instead of a straight boundary surface 93, a curved boundary surface could also be selected.
  • the angle reduction extends only over a partial area 95 of the total width of a narrow side 96.
  • a casting cone 97 is matched to the angle reduction so that the narrow side of a cast strand lies against the mold wall over its entire width .
  • the continuous coke according to the invention can be used for straight or curved mold cavities, for horizontal, oblique or vertical continuous casting.
  • the invention is also not tied to a mold design. It can be constructed as a plate, tube or block mold.
  • a further advantageous application of the invention can be achieved with molds which are adjusted in their format during a running casting and which are described in EP patent 0 028 766.

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

Abstract

1. A continuous casting mould for the continuous casting of steel strands with substantially polygonal cross sections, the mould cavity being provided in the running direction of the strand with a casting cone, characterized in that edge angles (9, 10 ; 21-25 ; 90, 92) of the polygonal cross section of the mould cavity (5) diminish at least in one input section (54, 84) of the mould cavity (5) in the running direction (56) of the strand to predetermined values compensating the shrinkage of the strand crust (20).

Description

Die Erfindung betrifft eine Durchlaufkokille zum Stranggießen von Stahlsträngen mit im wesentlichen polygonalem Querschnitt, wobei der Formhohlraum in Stranglaufrichtung mit einem Gießkonus versehen ist.The invention relates to a continuous mold for the continuous casting of steel strands with an essentially polygonal cross-section, the mold cavity being provided with a casting cone in the strand running direction.

Es sind Kokillen mit vier-, sechs- und mehreckigem Querschnitt des Formhohlraumes bekannt. Solche Kokillen werden in Stranglaufrichtung mit einem Gießkonus versehen, um die Schwindung der sich erstarrenden Strangkruste auszugleichen.Chill molds with a four, six and polygonal cross section of the mold cavity are known. Such molds are provided with a pouring cone in the direction of the strand to compensate for the shrinkage of the solidifying strand crust.

Obwohl der Gießkonus so genau als möglich der Stahlqualität, der Gießtemperatur etc. angepaßt wird, ist es bis heute nicht gelungen, über den Umfang gesehen ein gleichmäßiges Strangkrustenwachstum innerhalb der Kokille zu erreichen. In den Eckbereichen des Stranges kann die Strangkruste, insbesondere bei großen Bloom- und Brammenquerschnitten an einzelnen Stellen gegenüber benachbarten Strangkrustenbereichen bis zu 50 % und mehr dünner sein. Wird durch Schwindspannungen etc. die Strangkruste von der Kokillenwand weggezogen und dadurch die Kühlung in Bereichen mit dünner Strangkruste über eine längere Strecke vermindert, so können durch Wiederaufheizung und/oder durch Rißbildung Durchbrüche innerhalb oder außerhalb der Kokille entstehen.Although the casting cone is adapted as precisely as possible to the steel quality, the casting temperature, etc., it has so far not been possible to achieve a uniform strand crust growth within the mold over the circumference. In the corner areas of the strand, the strand crust, in particular in the case of large bloom and slab cross sections, can be up to 50% and more thinner at individual points than neighboring strand crust regions. If the strand crust is pulled away from the mold wall by shrinkage stresses etc. and the cooling in areas with a thin strand crust is reduced over a longer distance, breakthroughs inside or outside the mold can occur due to reheating and / or cracking.

Auch wenn durch eine optimale Anpassung des Gießkonuses und durch einen hohen Standard der Eingießtechnik heute Durchbrüche weitgehend vermieden werden können, so entstehen in den Kantenbereichen mit ungleichmäßiger Abkühlung Risse in der Strangkruste, die die Qualität des Stranges bzw. des Endproduktes beeinträchtigen.Even though breakthroughs can largely be avoided today by optimally adapting the pouring cone and using a high standard of casting technology, cracks in the strand crust occur in the edge areas with uneven cooling, which impair the quality of the strand or the end product.

Der Erfindung liegt die Aufgabe zugrunde, die beschriebenen Mängel und Nachteile bei Kokillen gemäß dem Oberbegriff auszuschalten und insbesondere die Gleichmäßigkeit der Strangkühlung in den Eckbereichen zu verbessern. Dadurch soll eine erhöhte Stranggeometrie und eine Verbesserung der Strangoberfläche erreicht werden. Auch sollen Strangdurchbrüche, die auf ungleichmäßige Kühlung in der Kokille zurückzuführen sind, sowohl innerhalb wie auch außerhalb der Kokille vermieden werden. Eine weitere Zielsetzung stellt die Verhütung von Rissen an der Strangoberfläche bzw. von Innenrissen in den Kantenbereichen dar, die die Qualität der Endprodukte mindern.The invention has for its object to eliminate the shortcomings and disadvantages described in molds according to the preamble and in particular to improve the uniformity of the strand cooling in the corner areas. This is intended to achieve an increased strand geometry and an improvement in the strand surface. Also, strand breaks that are due to uneven cooling in the mold should be avoided both inside and outside the mold. Another objective is to prevent cracks on the strand surface or internal cracks in the edge areas, which reduce the quality of the end products.

Nach der Erfindung wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.According to the invention, this object is achieved by the characterizing features of claim 1.

Mit der erfindungsgemäßen Stranggießkokille wird es möglich, auch in den Eckbereichen des Stranges innerhalb der Kokille eine gleichmäßig dicke Strangkruste zur Erstarrung zu-bringen. Dadurch ist nicht nur eine verbesserte Stranggeometrie erreichbar, auch Durchbrüche innerhalb und außerhalb der Kokille können vermieden werden. Die erreichte gleichmäßige Erstarrung der Strangkruste verhütet im weiteren die Entstehung von Kantenrissen an und unter der Oberfläche, wodurch die Strangqualität weiter verbessert wird.With the continuous casting mold according to the invention it is possible to solidify a uniformly thick strand crust even in the corner areas of the strand within the mold. As a result, not only can an improved strand geometry be achieved, breakthroughs inside and outside the mold can also be avoided. The uniform solidification of the strand crust further prevents the formation of edge cracks on and below the surface, which further improves the strand quality.

Je nach Wahl der Kokillenlänge bzw. einer Teillänge der Kokille mit Winkelverkleinerung kann die Winkelverkleinerung in einem oder mehreren Schritten erfolgen. Zur Erhöhung der Standzeit der Kokillenwände, wird nach einem weiteren Merkmal vorgeschlagen, den Kantenwinkel über eine Teillänge der Kokille stetig zu verkleinern. Ein zusätzlicher Vorteil wird erreicht, wenn sich der Kantenwinkel nur auf dem eingießseitigen Abschnitt verkleinert und auf dem austrittseitigen Abschnitt konstant bleibt.Depending on the choice of the mold length or a partial length of the mold with angle reduction, the angle reduction can take place in one or more steps. In order to increase the service life of the mold walls, it is proposed according to a further feature to continuously reduce the edge angle over a partial length of the mold. An additional advantage is achieved if the edge angle is reduced only on the section on the pouring side and remains constant on the section on the outlet side.

Bei relativ langen Kokillen kann, nach einem zusätzlichen Merkmal, der Kantenwinkel entlang dem eingießeitigen Abschnitt stärker und entlang dem austrittseitigen Abschnitt schwächer verkleinert werden.In the case of relatively long molds, according to an additional feature, the edge angle can be reduced to a greater extent along the pouring-in section and to a lesser extent along the outlet-side section.

Neben einer stetigen Winkelverkleinerung sind im eingießseitigen Abschnitt auch progressive und entlang dem austrittseitigen Abschnitt degressive Winkelverkleinerungen anwendbar.In addition to a constant angle reduction, progressive angle reductions and degressive angle reductions along the outlet side section can also be used.

Es sind Kokillen mit konvexen und ebenen Wänden im Stand der Technik bekannt. Zur Erreichung günstiger Herstellkosten wird gemäß einem weiteren Merkmal bei Kokillen mit im wesentlichen rechteckigem Formhohlraum empfohlen, die Winkel bildenden Wände bzw. Wandabschnitte als ebene Flächen auszubilden. Bei solchen Kokillen wird zusätzlich noch vorgeschlagen, im Badspiegelbereich mit einem Kantenwinkel von 90° zu beginnen, der sich dann in Stranglaufrichtung allmählich verkleinert.Chill molds with convex and flat walls are known in the prior art. In order to achieve favorable manufacturing costs, it is recommended according to a further feature in the case of molds with an essentially rectangular mold cavity that the walls or wall sections forming the angle are designed as flat surfaces. In the case of such molds, it is additionally proposed to start with an edge angle of 90 ° in the area of the bath level, which then gradually decreases in the direction of the strand.

Die für die Winkelverkleinerung notwendige Wandausbildung entlang der Kante wird aus bearbeitungstechnischen Gründen mit Vorteil nur auf einer Kantenseite angebracht. Bei Plattenkokillen bietet sich hierfür die Schmalseite an. Die der vorgesehenen Winkelverkleinerung angepasste Schrägfläche kann sich beispielsweise nur über eine Teilbreite im kantenbereich oder bis zur Mitte der Schmalseite erstrecken.The wall formation along the edge required for the reduction in angle is advantageously only applied on one side of the edge for processing reasons. The narrow side of plate molds is ideal for this. The inclined surface adapted to the intended reduction in angle can, for example, only extend over a partial width in the edge region or up to the middle of the narrow side.

Im nachfolgenden werden Beispiele der Erfindung anhand von Figuren beschrieben.Examples of the invention are described below with reference to figures.

Es zeigen:

  • Fig. 1 eine Draufsicht auf einen Teil einer Plattenkokille,
  • Fig. 2 ein schematischer Horizontalschnitt durch eine Ecke einer Kokille mit darin befindlicher Strangkruste,
  • Fig. 3, 6, 8 Ansichten auf drei Beispiele von Kokillenseiten, die einem Formhohlraum zugekehrt sind,
  • Fig. 5 eine Draufsicht auf Fig. 3,
  • Fig. 4, 7, 9 Seitensichten der Schmalseiten gemäß Fig. 3, 6, 8 und
  • Fig. 10 ein schematischer Horizontalschnitt durch eine Ecke einer weiteren Kokille.
Show it:
  • 1 is a plan view of part of a plate mold,
  • 2 shows a schematic horizontal section through a corner of a mold with a strand crust located therein,
  • 3, 6, 8 views on three examples of mold sides, which face a mold cavity,
  • 5 is a plan view of FIG. 3,
  • 4, 7, 9 side views of the narrow sides according to FIGS. 3, 6, 8 and
  • Fig. 10 is a schematic horizontal section through a corner of another mold.

In Fig. 1 stößt bei einer Plattenkokille 2 eine Schmalseite 3 gegen zwei teilweise dargestellte Breitseiten 4, 4'. Diese Plattenkokille 2 stellt eine Durchlaufkokille zum Stranggießen von Vorblöcken und Brammen dar. Sie weist einen polygonalen Formhohlraum 5 mit einem im wesentlichen rechteckigen Querschnitt auf. Es wäre auch denkbar, daß der Formhohlraum 6-oder 8-eckig etc. wäre. In Stranglaufrichtung ist der Formhohlraum 5 mit einem Gießkonus 6 an der Schmalseite 3 und beispielsweise mit einem Gießkonus 7, 7' an den Breitseiten 4, 4' versehen. Die mit 9, 9' bezeichneten Kantenwinkel des Formhohlraumes 5 sind an der eingießseitigen Kokillen-Begrenzungsfläche beispielsweise 90°. Sie verkleinern sich in Stranglaufrichtung auf Kantenwinkel 10, 10'.In Fig. 1, in a plate mold 2, a narrow side 3 abuts two broad sides 4, 4 'which are partially shown. This plate mold 2 represents a continuous mold for the continuous casting of ingots and slabs. It has a polygonal mold cavity 5 with an essentially rectangular cross section. It would also be conceivable for the mold cavity to be hexagonal or octagonal, etc. In the strand running direction, the mold cavity 5 is provided with a casting cone 6 on the narrow side 3 and, for example, with a casting cone 7, 7 'on the broad sides 4, 4'. The edge angles of the mold cavity 5, designated 9, 9 ', are, for example, 90 ° on the mold-side delimitation surface. They decrease in the strand running direction to edge angles 10, 10 '.

In Fig. 2 ist eine Strangkruste 20, die einen Kantenwinkel 25 aufweist, kurz vor ihrem Austritt aus der Kokille dargestellt. Mit 21, 22, 23, 24 sind strichpunktiert Kokillenwände mit gegenüber Winkel 25 größeren Kantenwinkeln dargestellt, die die Strangkruste 20 auf ihrem Weg durch die Kokille vor dem Schnitt in Fig. 2 geführt haben. Der Winkel 21 am Kokilleneingang ist auch hier 90°. Er könnte aber auch größer als 90° sein. Die Winkel 22, 23, 24 stellen Zwischenstufen der kontinuierlichen Winkelverkleinerung während des Durchlaufes der Strangkruste 20 durch die Kokille dar. Die Winkelverkleinerung ist bei diesem Beispiel zur klareren Erkennung übertrieben stark dargestellt. Pfeile 26 und 27 zeigen Zugspannungen, die durch die Schwindung der Strangkruste 20 entstehen. Pfeile 29 zeigen auf eine Linie 28 gerichtete Druckspannungen, die durch die Winkelverkleinerungen 22-25 verursacht werden. Bei Kokillen gemäß dem Stand der Technik können durch die Zugspannungen, wie durch die Pfeile 26 und 27 dargestellt, und durch Zug- bzw. Schwindspannungen, die in der Ecke selbst entstehen, entlang der Linie 28 Risse entstehen. Die Verkleinerung der Kantenwinkel 22-25 wird deshalb so dimensioniert, daß sich die Zugspannungen in der Strangkrustenecke, die durch die Schwindung erzeugt werden, zumindest abbauen, kompensiert oder in Druckspannungen gemäß den Pfeilen 29 überführt werden.2, a strand crust 20, which has an edge angle 25, is shown shortly before it emerges from the mold. With 21, 22, 23, 24, dash-dot mold walls are shown with edge angles larger than angles 25, which led the strand crust 20 on its way through the mold before the cut in FIG. 2. The angle 21 at the mold entrance is also 90 ° here. But it could also be larger than 90 °. The angles 22, 23, 24 represent intermediate stages of the continuous angle reduction during the passage of the strand crust 20 through the mold. The angle reduction in this example is exaggerated for clearer identification. Arrows 26 and 27 show tensile stresses caused by the shrinkage of the strand crust 20. Arrows 29 show compressive stresses directed to a line 28, which are caused by the angle reductions 22-25. In the case of molds according to the prior art, the tensile stresses, as represented by the arrows 26 and 27, and the tensile or shrinkage stresses which arise in the corner itself can cause cracks along the line 28. The reduction in the edge angle 22-25 is therefore dimensioned such that the tensile stresses in the strand crust corner, which are generated by the shrinkage, are at least reduced, compensated or converted into compressive stresses according to the arrows 29.

Durch die Winkelverkleinerungen 22-25 können aber auch alle Ablöseerscheinungen der Strangkruste 20 von der gekühlten Kokillenwand im Bereich der Ecken vermieden werden und dadurch ein gleichmäßiges Krustenwachstum, insbesondere eine gleichmäßige Krustendicke, erreicht werden. Risse und Durchbrüche im Kantenbereich können dadurch vermieden werden.The angle reductions 22-25 also make it possible to avoid all signs of detachment of the strand crust 20 from the cooled mold wall in the area of the corners, thereby achieving a uniform crust growth, in particular a uniform crust thickness. This prevents cracks and breakthroughs in the edge area.

Die Winkelverkleinerung wird der Verweilzeit der Strangkruste in der Kokille, d.h. der mittleren Ausziehgeschwindigkeit angepasst. Im weiteren ist die Stahlzusammensetzung, Art der Gießpulverschlacke, Gießtemperatur, Wärmeleitfähigkeit der gekühlten Kokillenwand und Kokillenlänge etc. für die Winkelverkleinerung maßgebend. Vorteilhafte Werte der Kantenwinkelverkleinerung bei im wesentlichen rechtrechteckigen Stahlsträngen liegen zwischen 0,2° und 4°, vorzugsweise zwischen 0,2° und 2°. Es werden dabei Gießgeschwindigkeiten von etwa 1 m bis 1.5 m pro Minute vorausgesetzt. Wird beispielsweise die Kantenwinkelverkleinerung zu groß gewählt, so stellen sich über den Höhenbereich der Winkelverkleinerung der Kokillenwand Verschleißerscheinungen durch zu starke Reibung zwischen der Kokillenwand und dem Strang ein. Bei zu kleiner Winkelverkleinerung treten die im Stand der Technik bekannten Innen-und/oder Aussenrisse an den Kanten durch Ablösung der Strangkruste und ununregelmäßiges Krustenwachstum im Kantenbereich und Kantendurchbrüche auf.The angular reduction becomes the dwell time of the strand crust in the mold, i.e. adjusted to the average pull-out speed. In addition, the steel composition, type of cast powder slag, pouring temperature, thermal conductivity of the cooled mold wall and mold length etc. are decisive for the reduction in angle. Advantageous values for the reduction of the edge angle in the case of essentially rectangular steel strands are between 0.2 ° and 4 °, preferably between 0.2 ° and 2 °. Casting speeds of approximately 1 m to 1.5 m per minute are assumed. If, for example, the edge angle reduction is chosen too large, signs of wear occur due to excessive friction between the mold wall and the strand over the height range of the angle reduction of the mold wall. If the angular reduction is too small, the inside and / or outside cracks known in the prior art occur at the edges due to detachment of the strand crust and irregular crust growth in the edge area and edge breakthroughs.

Fig. 3,4 und 5 zeigen eine Schmalseitenwand 30 einer Plattenkokille. Entlang der Linie 31 verläuft ein den Gießpara metern angepaster Gießkonus gemäß dem Stand der Technik. Beginnend von der eingießeitigen Oberkante 33 bis zur strangaustrittseitigen Unterkante 34 sind Flächen 35 dachförmig ausgebildet, die, zusammen mit Breitseiten wie in Fig. 1 dargestellt, eine stetige Kantenwinkelverkleinerung ergeben. Diese Kantenwinkelverkleinerung könnte sich aber auch nur über eine Teillänge der Kokille erstrecken.3, 4 and 5 show a narrow side wall 30 of a plate mold. Along the line 31 runs a pouring cone adapted to the casting parameters according to the prior art. Starting from the upper edge 33 on the casting side to the lower edge 34 on the strand exit side, surfaces 35 are roof-shaped which, together with broad sides as shown in FIG. 1, result in a constant reduction in the edge angle. This reduction in edge angle could also only extend over a partial length of the mold.

In Fig. 6 und 7 ist eine Schmalseitenwand 50 mit einer gegenüber Fig. 3, 4, 5 anderen dachförmigen Oberfläche versehen. In einem eingießeitigen Abschnitt 54 wird eine Abdachung durch Flächen 51 und in einem austrittseitigen Abschnitt 55 durch Fläche 52 gebildet. Die Flächen 51, 52 bilden zusammen mit Breitseiten, wie in Fig. 1 dargestellt, Kantenwinkel, die in Stranglaufrichtung 56 sich stetig verkleinern, wobei sich der Kantenwinkel auf dem austrittseitigen Abschnitt 55 schwächer verkleinert als auf dem eingießeitigen Abschnitt 54. Mit einer strichpunktierten Linie 58 ist als Variante eine Dachform dargestellt, die, zusammen mit einer Breitseite auf dem austrittseitigen Abschnitt 55 einen gleichbleibenden Kantenwinkel ergäbe. Die Winkelverkleinerung erstreckt sich in diesem Beispiel nur über Teilbreiten 59, 59' der Kokillenwand. Ein Wandmittelteil mit einer Breite 60 ist mit einem Gießkonus versehen.6 and 7, a narrow side wall 50 is provided with a roof-shaped surface that is different from that in FIGS. 3, 4, 5. In a section 54 on the pouring side, a roof is formed by surfaces 51 and in a section 55 on the outlet side by surface 52. The surfaces 51, 52 together with broad sides, as shown in FIG. 1, form edge angles which decrease continuously in the direction of strand 56, the edge angle decreasing less on the outlet-side section 55 than on the pour-side section 54. With a dash-dotted line 58 a roof shape is shown as a variant which, together with a broad side on the outlet-side section 55, would result in a constant edge angle. The angle reduction extends in this example only over part-width sections 59, 59 'of the mold wall. A wall middle part with a width 60 is provided with a casting cone.

Eine weitere Variante ist in den Fig. 8 und 9 dargestellt, wobei eine Fläche 80 einen Gießkonus nach der Linie 81 aufweist. Unterhalb eines Badspiegels 82 wird entlang der Linie 83 eine Winkelverkleinerung über eine Teillänge 84 aufgebracht. Entlang der Teillänge 85 verformt sich die Strangkante nicht mehr.Another variant is shown in FIGS. 8 and 9, wherein a surface 80 has a pouring cone along the line 81. Below a bath level 82, an angular reduction over part length 84 is applied along line 83. The strand edge no longer deforms along the partial length 85.

Bei allen gezeigten Beispielen sind Formhohlräume mit im wesentlichen rechteckigem Querschnitt dargestellt. Die die Winkel bildenden Wände bzw. Wandabschnitte sind aus Geraden gebildet. In Fig. 10 ist ein Beispiel dargestellt, bei welchem ein Winkel 92 auf der Eingießeite der Kokille größer ist als 90° und ein Winkel 90 auf der Austrittseite der Kokille 90° beträgt. Anstelle einer geraden Begrenzungsfläche 93 könnte aber auch eine gebogene Begrenzungsfläche gewählt werden. Wie in den Fig. 6 und 7 erstreckt sich die Winkelverkleinerung nur über einen Teilbereich 95 der Gesamtbreite einer Schmalseite 96. In einem Mittelteil ist ein Gießkonus 97 auf die Winkelverkleinerung so abgestimmt, daß die Schmalseite eines gegossenen Stranges über ihre gesamte Breite an der Kokillenwand anliegt.In all the examples shown, mold cavities are shown with an essentially rectangular cross section. The walls or wall sections forming the angles are formed from straight lines. An example is shown in FIG. 10, in which an angle 92 on the pouring side of the mold is greater than 90 ° and an angle 90 on the exit side of the mold is 90 °. Instead of a straight boundary surface 93, a curved boundary surface could also be selected. As in FIGS. 6 and 7, the angle reduction extends only over a partial area 95 of the total width of a narrow side 96. In a central part, a casting cone 97 is matched to the angle reduction so that the narrow side of a cast strand lies against the mold wall over its entire width .

Die erfindungsgemäße Durchlaufkokilte kann bei geraden oder bogenförmigen Formhohlraumen, beim horizontalen, schrägen oder vertikalen Stranggießen Anwendung finden. Auch ist die Erfindung nicht an eine Kokillenbauart gebunden. Sie kann als Platten-, Rohr- oder Blockkokille aufgebaut sein.The continuous coke according to the invention can be used for straight or curved mold cavities, for horizontal, oblique or vertical continuous casting. The invention is also not tied to a mold design. It can be constructed as a plate, tube or block mold.

Eine weitere vorteilhafte Anwendung der Erfindung kann bei Kokillen erreicht werden, die während eines laufenden Gusses in ihrem Format verstellt werden und die im EP-Patent 0 028 766 beschrieben sind.A further advantageous application of the invention can be achieved with molds which are adjusted in their format during a running casting and which are described in EP patent 0 028 766.

Claims (9)

1. A continuous casting mould for the continuous casting of steel strands with substantially polygonal cross sections, the mould cavity being provided in the running direction of the strand with a casting cone, characterized in that edge angles (9, 10; 21-25; 90, 92) of the polygonal cross section of the mould cavity (5) diminish at least in one input section (54, 84) of the mould cavity (5) in the running direction (56) of the strand to predetermined values compensating the shrinkage of the strand crust (20).
2. A continuous casting mould according to claim 1, characterized in that the edge angles (21-25) diminish uniformly over at least part (54, 84) of the length of the mould.
3. A continuous casting mould according to claim 1 or claim 2, characterized in that the edge angles (21-25) diminish over the input section (54, 84) and remain constant over the outlet section (55, 85).
4. A continuous casting mould according to claim 1 or claim 2, characterized in that the edge angles (21-25) diminish more strongly along the input section (54) and more weakly along the output section (55).
5. A continuous casting mould according to any one of claims 1 to 4, characterized in that the angular reduction has a tendency to increase in the running direction (56) of the strand in the input section (54).
6. A continuous casting mould according to any one of claims 1 to 5, characterized in that in moulds with substantially rectangular mould cavities (5) the walls (3, 4) forming the angles (9, 10) are constructed as planar surfaces.
7. A continuous casting mould according to any one of claims 1 to 6, characterized in that the substantially rectangular mould cavity (5) comprises angles of 90° in the bath level area and in that the angular reduction is applied only on one edge side.
8. A continuous casting mould according to any one of claims 1 to 6, characterized in that the substantially rectangular mould cavity comprises angles (92) in the bath level area which are larger than 90°.
9. A continuous casting mould according to any one of claims 1 to 8, characterized in that the inclined surfaces provided for the angular reduction (22-25) extend only over partial widths (59, 59', 95) in the edge area of the mould wall (50, 96).
EP85112893A 1984-10-26 1985-10-11 Continuous casting mold for steel billets with polygonal cross-section Expired EP0179364B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85112893T ATE35785T1 (en) 1984-10-26 1985-10-11 CONTINUOUS MOLD FOR CONTINUOUS CASTING OF STEEL STRIPS WITH POLYGONAL CROSS-SECTION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5133/84 1984-10-26
CH5133/84A CH664915A5 (en) 1984-10-26 1984-10-26 CONTINUOUS CHOCOLATE FOR CONTINUOUSLY STEEL STRIPS WITH POLYGONAL CROSS-SECTION.

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EP0179364A2 EP0179364A2 (en) 1986-04-30
EP0179364A3 EP0179364A3 (en) 1987-04-01
EP0179364B1 true EP0179364B1 (en) 1988-07-20

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EP85112893A Expired EP0179364B1 (en) 1984-10-26 1985-10-11 Continuous casting mold for steel billets with polygonal cross-section

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EP (1) EP0179364B1 (en)
JP (1) JPS61103649A (en)
AT (1) ATE35785T1 (en)
CH (1) CH664915A5 (en)
DE (1) DE3563822D1 (en)

Cited By (1)

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DE102012207786A1 (en) 2012-05-10 2013-11-14 Sms Siemag Ag Continuous casting mold comprises number of mold walls, which form casting surface with their inner sides, where inner side is provided with a profile, such that the inner side has non-planar shape and central region adjoining side region

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DE3627991A1 (en) * 1986-08-18 1988-02-25 Mannesmann Ag METHOD FOR CONTINUOUSLY MOLDING SLABS AND DEVICE FOR CARRYING OUT THE METHOD
FR2649918B1 (en) * 1989-07-19 1994-06-10 Lorraine Laminage PLATE LINGOTIERE FOR CONTINUOUS CASTING OF METAL
US5082746A (en) * 1990-04-20 1992-01-21 Forward Gordon E As-continuously cast beam blank and method for casting continuously cast beam blank
ATE105750T1 (en) * 1991-02-06 1994-06-15 Concast Standard Ag MOLD FOR CONTINUOUS CASTING OF METALS, ESPECIALLY STEEL.
AT404235B (en) * 1995-04-18 1998-09-25 Voest Alpine Ind Anlagen CONTINUOUS CHOCOLATE
US6270590B1 (en) 1995-08-03 2001-08-07 Europa Metalli S.P.A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
US6461534B2 (en) 1997-11-19 2002-10-08 Europa Metalli S. P. A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
KR101360564B1 (en) * 2011-12-27 2014-02-24 주식회사 포스코 Mold in continuous casting

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US3226782A (en) * 1963-03-01 1966-01-04 United States Steel Corp Variable-taper casting mold
JPS5216449B2 (en) * 1972-08-14 1977-05-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207786A1 (en) 2012-05-10 2013-11-14 Sms Siemag Ag Continuous casting mold comprises number of mold walls, which form casting surface with their inner sides, where inner side is provided with a profile, such that the inner side has non-planar shape and central region adjoining side region

Also Published As

Publication number Publication date
ATE35785T1 (en) 1988-08-15
CH664915A5 (en) 1988-04-15
EP0179364A3 (en) 1987-04-01
JPS61103649A (en) 1986-05-22
DE3563822D1 (en) 1988-08-25
EP0179364A2 (en) 1986-04-30

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