EP0784523B1 - Immersed pouring spout - Google Patents
Immersed pouring spout Download PDFInfo
- Publication number
- EP0784523B1 EP0784523B1 EP95930397A EP95930397A EP0784523B1 EP 0784523 B1 EP0784523 B1 EP 0784523B1 EP 95930397 A EP95930397 A EP 95930397A EP 95930397 A EP95930397 A EP 95930397A EP 0784523 B1 EP0784523 B1 EP 0784523B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall
- casting
- submerged
- tube
- mould
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005266 casting Methods 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000000155 melt Substances 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000011324 bead Substances 0.000 claims description 4
- 239000000161 steel melt Substances 0.000 claims 2
- 238000007654 immersion Methods 0.000 abstract description 55
- 239000007788 liquid Substances 0.000 description 8
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 4
- 239000002893 slag Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Definitions
- the invention relates to a device for the continuous casting of steel, consisting of a dip tube with an elongated cross-section and one, long and wide sides Continuous casting mold, in particular for casting thin slabs.
- Immersion pipes have a round, predominantly circular or elliptical shape when they are connected to the casting tank. This shape can continue up to the mouth area of the immersion pouring tube, but it can also change into another shape, for example a rectangular shape.
- an immersion pouring tube is known whose at least in its section immersed in the melt has a substantially rectangular outer and inner cross section. The longitudinal edges of this immersion pouring tube run parallel to the long sides of the continuous casting mold, so that an optimal space for the flow cross section is used, in particular in the case of rectangular strand cross sections.
- the flow cross-section available here with normal slabs between the broad side of the mold and the outer pouring tube wall is no longer present in the case of molds for the production of thin slabs.
- the immersion pouring tube known from this document influences the melt flowing through the immersion pouring tube, in particular the exit impulse of the pouring jet.
- the outer shape of the immersion pouring tube corresponds to an elongated oval.
- turbulence and eddies occur particularly in the corners in the area of the mold wide side as a result of the flow of the steel.
- wave peaks and valleys occur in the area of the long sides of the immersion pouring tube, with the disadvantageous consequence of an uneven supply of slag in the area of the free mold cross section in the shadow of the immersion pouring tube. This leads to uneven lubrication and a non-uniform heat transfer between the strand shell formed from the liquid steel and the mold wall, which also results in the drawing in of slag and casting powder under the bath surface.
- the invention has set itself the goal of creating a device that is constructive simple construction the kinetic energy of the liquid steel in the area between the section of the immersion tube immersed in the melt and the Dismantles the long sides of the mold and can be predefined on the flow formation in the Liquid steel in the mold area in the bath surface affects.
- the molten steel leaving the immersion pouring tube initially moves in the conveying direction of the strand.
- the flow rate of the liquid steel moves the Melt away from the mouth of the immersion nozzle to a point where reverses the direction of flow of the molten steel and then, into two separate ones Streams divided, near the broad sides of the molds against the direction of strand withdrawal flows to the bathroom surface.
- the device according to the invention has an outer tube wall shape which, at any immersion depth of the immersed pouring tube in the continuous casting mold, is at a constant distance from the long sides of the mold. Shaped elements are provided on the broad sides of the immersion pouring tube in the area immersed in the melt, which provide minimal resistance to the horizontal flow of the melt located in the mold and the casting powder floating on it.
- the outer wall of the area of the immersion pouring tube which is immersed in the melt is either directly designed in such a way that a minimal flow resistance to the horizontally flowing melt is achieved, or independent components are provided which are arranged in front of the broadside of the immersion pouring tube.
- the inner wall of the immersion nozzle as well as the outer wall of the immersion nozzle are given shapes that allow optimal flow conditions both in the immersion nozzle and around the immersion nozzle. Wall thickness changes will occur with one-piece immersion pipes.
- immersion pouring tubes are used which have a uniform wall thickness, which essentially depends on the shape of the inner tube wall.
- an immersion pouring tube 10 is shown, the inner tube wall of which 11 and the outer tube wall with 12, the area on the casting container side with 13 and the Mouth area is designated 14.
- the region 13 on the side of the casting container is tubular designed and connected to a casting tank, not shown.
- the Mouth area has a substantially flattened shape, the mold broadside Area 16 is significantly shorter than area 17 on the long side of the mold.
- FIG. 1 shows a section through a mold 20, the mold long sides 21 and Has broad mold sides 22.
- the immersion pouring tube 10 is arranged in the center of the mold 20.
- the immersion pouring tube 10 has a rectangular cross-sectional shape.
- a shaped element 31 designed as a wedge 32 is arranged in front of the mold-wide area 16.
- the long sides of the mold run essentially parallel.
- the distance of the tube outer wall 12 to the inner mold longitudinal side 21, which has the maximum mold width B, is denoted by d.
- the left side of the immersion pouring tube 10 of the horizontal section in FIG. 1 is designed like a boat body 35.
- the immersion pouring tube 10 has a wedge-shaped base piece 18 in the center. In this variant, the mold is cambered.
- the current is sketched in the left part.
- the liquid material rises in the area of the mold broadside to the bath surface, shown here by arrowheads. From there, the current moves in the direction of the immersion pouring tube, evenly divided by the tip of the boat-shaped broad side of the immersion pouring tube. In the middle of the long side of the immersion pouring tube (represented by the arrow ends), the liquid steel flow moves in the direction of the strand withdrawal.
- the lower area of FIG. 1 shows vertical sections through the mold and the dip tube, specifically the section CC through a cambered mold and EE through a mold with parallel side walls.
- the outer tube wall 12 is designed such that it has a constant distance d from the inner wall of the long side 21 of the mold when the depth of immersion into the mold or the melt is different.
- Figures 2 and 3 have a section through a dip tube 10, the mouth side has a conical extension 15, in the center of a wedge-shaped base piece 18 is provided.
- the angle of inclination is 4 ° to 20 °.
- the outer tube wall 12 of the immersion pouring tube is in the melt immersed area designed on the broadside of the dip tube in such a way that the horizontal Flow of the molten steel and the casting powder floating on it minimal resistance is opposed.
- the outer tube wall is on the left 12 hull-shaped 35 ending in a tip, on the right
- a Taylor bead 34 which is also known from shipping, is provided on the side. Both Shaped elements are also with constant wall thickness of the dip tube (dashed Line).
- FIG. 3 shows an immersion pouring tube 10 in which the shaped elements 31 are independent Components are designed by holding devices 37 as on the left side or fastened to the immersion nozzle by means of a retaining web 38 as on the right-hand side are.
- the immersion pouring tube 10 has a constant wall thickness.
- the as an independent Components 31 designed as components can have any cross-sectional shapes, a semicircular outer contour 31 is shown in the left part and in the right part Part of the shape of a wedge 32.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Glass Compositions (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Sampling And Sample Adjustment (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Coating Apparatus (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
Die Erfindung betrifft eine Einrichtung zum Stranggießen von Stahl, bestehend aus eine Tauchgießrohr mit länglichem Querschnitt und einer, Längs- und Breitseiten aufweisenden Stranggießkokille, insbesondere zum Gießen von Dünnbrammen.The invention relates to a device for the continuous casting of steel, consisting of a dip tube with an elongated cross-section and one, long and wide sides Continuous casting mold, in particular for casting thin slabs.
Tauchgießrohre weisen bei ihrem Anschluß an den Gießbehälter regelmäßig eine runde,
überwiegend kreisrunde oder auch elliptische Form auf. Diese Form kann sich bis
zum Mündungsbereich des Tauchgießrohres fortsetzen, sie kann aber auch in eine
andere Form, beispielsweise in eine rechteckige Form übergehen. So ist aus der DE
OS 24 42 187 ein Tauchgießrohr bekannt, dessen mindestens in seinen in die
Schmelze eintauchenden Abschnitt ein im wesentlichen rechteckigen Außen- und Innenquerschnitt
aufweist. Die Längskanten dieses Tauchgießrohres laufen parallel zu
den Längsseiten der Stranggießkokille, so daß insbesondere bei rechteckigen
Strangquerschnitten ein optimaler Raum für den Strömungsquerschnitt ausgenutzt
wird.
Der bei Normalbrammen hierbei zur Verfügung stehende Strömungsquerschnitt zwischen
der Kokillenbreitseite und der Tauchgießrohraußenwand ist bei Kokillen für die
Herstellung von Dünnbrammen nicht mehr gegeben. Hinzu tritt, daß die durch das
Tauchgießrohr geführten Flüssig-Stahlmengen bei den heutigen geforderten Gießleistungen
deutlich höhere Gießgeschwindigkeiten aufweisen, als es bei der aus der o. g.
20 Jahre alten Schrift bekannten Kokille üblich war. Die Strömung des flüssigen Stahls
ist dabei so groß, daß es zu deutlichen Badoberflächenbewegungen besonders im
Bereich zwischen dem Tauchgießrohr und den Kokillenlängsseiten kommt. Immersion pipes have a round, predominantly circular or elliptical shape when they are connected to the casting tank. This shape can continue up to the mouth area of the immersion pouring tube, but it can also change into another shape, for example a rectangular shape. For example, from DE OS 24 42 187 an immersion pouring tube is known whose at least in its section immersed in the melt has a substantially rectangular outer and inner cross section. The longitudinal edges of this immersion pouring tube run parallel to the long sides of the continuous casting mold, so that an optimal space for the flow cross section is used, in particular in the case of rectangular strand cross sections.
The flow cross-section available here with normal slabs between the broad side of the mold and the outer pouring tube wall is no longer present in the case of molds for the production of thin slabs. Added to this is the fact that the quantities of liquid steel guided through the immersion pouring tube have significantly higher pouring speeds than the molds known from the above-mentioned 20-year-old document, given the casting performance required today. The flow of the molten steel is so great that there are clear movements of the bath surface, especially in the area between the immersion nozzle and the long sides of the mold.
Aus WO 89/12519 ist es bekannt, Tauchgießrohre einzusetzen, deren in die Schmelze
eintauchender Abschnitt die Form eines plattgedrückten Rohres mit parallel geführten
Seitenwänden aufweist. Dieser breitmäulige Tauchgießrohrabschnitt weist dabei Öffnungen
auf, die allein oder zusammen mit Strömungsleitelementen den Ausfluß des
flüssigen Stahls aus dem Tauchgießrohr so führen, daß einzelne Flüssigmetallströme
sich kreuzen und somit zu einer Verringerung der Strömung führen.
Weiterhin ist aus der Schrift DE 41 42 447 C2 ein Tauchgießrohr zum Einleiten von
Stahlschmelze in eine Kokille bekannt, bei dem die Innenwand des den Querschnitt
erweiternden Teils des Tauchgießrohres zusammen mit den gegenüberliegenden
Wandteilen des Bodenstücks Strömungskanäle bilden. Das aus dieser Schrift bekannte
Tauchgießrohr nimmt Einfluß auf die das Tauchgießrohr durchströmende Schmelze,
insbesondere auf den Austrittsimpuls des Gießstrahles. Die Außenform des Tauchgießrohres
entspricht einem langgestrecktem Oval.
Bei den bekannten Tauchgießrohrformen kommt es besonders im Bereich der Ecken
im kokillenbreitseitigen Bereich infolge der Strömung des Stahl zu Turbulenzen und
Wirbeln. Hierbei treten im Bereich der Längsseiten des Tauchgießrohres Wellenberge
und -täler auf mit der nachteiligen Folge einer ungleichmäßigen Schlackeversorgung
im Bereich des freien Kokillenquerschnitts im Schatten des Tauchgießrohres. Dies
führt zu ungleichmäßiger Schmierung und einem ungleichförmigen Wärmeübergang
zwischen der sich aus dem Flüssigstahl bildenden Strangschale und der Kokillenwand,
was auch noch ein Einziehen von Schlacke und Gießpulver unter die Badoberfläche
zur Folge hat.From WO 89/12519 it is known to use immersion pouring tubes, the portion of which immersed in the melt has the shape of a flattened tube with parallel side walls. This wide-mouthed immersion pouring tube section has openings which, alone or together with flow guiding elements, guide the outflow of the liquid steel from the immersion pouring tube in such a way that individual liquid metal flows intersect and thus lead to a reduction in the flow.
Furthermore, from the document DE 41 42 447 C2 an immersion pouring tube for introducing molten steel into a mold is known, in which the inner wall of the part of the immersion pouring tube widening the cross section forms flow channels together with the opposite wall parts of the base piece. The immersion pouring tube known from this document influences the melt flowing through the immersion pouring tube, in particular the exit impulse of the pouring jet. The outer shape of the immersion pouring tube corresponds to an elongated oval.
In the known immersion pouring tube shapes, turbulence and eddies occur particularly in the corners in the area of the mold wide side as a result of the flow of the steel. Here, wave peaks and valleys occur in the area of the long sides of the immersion pouring tube, with the disadvantageous consequence of an uneven supply of slag in the area of the free mold cross section in the shadow of the immersion pouring tube. This leads to uneven lubrication and a non-uniform heat transfer between the strand shell formed from the liquid steel and the mold wall, which also results in the drawing in of slag and casting powder under the bath surface.
Die Erfindung hat sich das Ziel gesetzt, eine Einrichtung zu schaffen, die in konstruktiv einfachem Aufbau die kinetische Energie des flüssigen Stahls in dem Bereich zwischen dem in die Schmelze eingetauchten Abschnitt des Tauchgießrohres und den Kokillenlängsseiten abbaut und vorgebbar auf die Strömungsausbildung des in der Kokille befindlichen Flüssigstahls im Bereich der Badoberfläche Einfluß nimmt.The invention has set itself the goal of creating a device that is constructive simple construction the kinetic energy of the liquid steel in the area between the section of the immersion tube immersed in the melt and the Dismantles the long sides of the mold and can be predefined on the flow formation in the Liquid steel in the mold area in the bath surface affects.
Die Erfindung erreicht dieses Ziel durch die Merkmale des Anspruchs 1. Die Unteransprüche
zeigen vorteilhafte Weiterbildungen auf.The invention achieves this aim by the features of
Die das Tauchgießrohr verlassende Stahlschmelze bewegt sich anfänglich in Förderrichtung des Stranges. In Abhängigkeit der Richtung der Austrittsöffnungen des Tauchgießrohres und der Strömungsgeschwindigkeit des Flüssigstahls bewegt sich die Schmelze von der Mündung des Tauchgießrohres weg bis zu einem Punkt, in der sich die Strömungsrichtung des Flüssigstahls umkehrt und anschließend, in zwei einzelne Ströme aufgeteilt, in der Nähe der Breitseiten der Kokillen entgegen der Strangabzugsrichtung zur Badoberfläche strömt.The molten steel leaving the immersion pouring tube initially moves in the conveying direction of the strand. Depending on the direction of the outlet openings of the Immersion pouring tube and the flow rate of the liquid steel moves the Melt away from the mouth of the immersion nozzle to a point where reverses the direction of flow of the molten steel and then, into two separate ones Streams divided, near the broad sides of the molds against the direction of strand withdrawal flows to the bathroom surface.
Im Bereich der Badoberfläche bewegen sich die beiden getrennten Ströme des Flüssigstahls in Richtung Tauchgießrohr, sie werden an der den Breitseiten zugeneigten Außenwänden des Tauchgießrohres abgelenkt und in den Freiraum zwischen der Längsseite der Kokille und der Längsseite des Tauchgießrohres geführt. In Höhe der Mittenachse der Kokille prallen in den Freiräumen zu beiden Seiten des Tauchgießrohres die einzelnen in horizontaler Richtung sich bewegenden Stahlströme aufeinander und fließen gemeinsam in Strangabzugsrichtung ab.Move in the area of the bathroom surface the two separate streams of the liquid steel towards the immersion nozzle, they will deflected on the broad walls inclined outer walls of the immersion nozzle and in the space between the long side of the mold and the long side of the Immersed pouring pipe. At the height of the center axis of the mold, it bounces in the open spaces on both sides of the immersion nozzle, the individual in the horizontal direction moving steel flows on each other and flow together in the direction of strand withdrawal from.
Die erfindungsgemäße Einrichtung besitzt unabhängig von der Ausgestaltung der
Rohrinnenwand eine Rohraußenwandform, die bei beliebiger Eintauchtiefe des
Tauchgießrohres in die Stranggießkokille eine konstante Distanz zu den Kokillenlängsseiten
aufweist. An den Breitseiten des Tauchgießrohres im in die Schmelze
eintauchenden Bereich sind Formelemente vorgesehen, die der horizontalen Strömung
der in der Kokille befindlichen Schmelze und dem auf ihr schwimmenden Gießpulver
einen minimalen Widerstand entgegensetzen.
Die Außenwand des in die Schmelze eintauchenden Bereichs des Tauchgießrohres ist
entweder unmittelbar so ausgestaltet, daß ein minimaler Strömungswiderstand gegenüber
der horizontal fließenden Schmelze erreicht wird oder es sind unabhängige Bauteile
vorgesehen, die vor der Tauchgießrohrbreitseite angeordnet sind.
Die Tauchgießrohrinnenwand wie auch die Tauchgießrohraußenwand erhalten Formen,
die jeweils optimale Strömungsverhältnisse sowohl im Tauchgießrohr wie auch
um das Tauchgießrohr herum erlauben. Bei einstückigen Tauchgießrohren werden
Wandstärkenänderungen auftreten. Bei der Verwendung von unabhängigen Bauteilen
für die Formelemente werden Tauchgießrohre eingesetzt, die eine gleichmäßige
Wandstärke besitzen, die sich im wesentlichen nach der Form der Rohrinnenwand
richtet. Regardless of the design of the inner tube wall, the device according to the invention has an outer tube wall shape which, at any immersion depth of the immersed pouring tube in the continuous casting mold, is at a constant distance from the long sides of the mold. Shaped elements are provided on the broad sides of the immersion pouring tube in the area immersed in the melt, which provide minimal resistance to the horizontal flow of the melt located in the mold and the casting powder floating on it.
The outer wall of the area of the immersion pouring tube which is immersed in the melt is either directly designed in such a way that a minimal flow resistance to the horizontally flowing melt is achieved, or independent components are provided which are arranged in front of the broadside of the immersion pouring tube.
The inner wall of the immersion nozzle as well as the outer wall of the immersion nozzle are given shapes that allow optimal flow conditions both in the immersion nozzle and around the immersion nozzle. Wall thickness changes will occur with one-piece immersion pipes. When using independent components for the shaped elements, immersion pouring tubes are used which have a uniform wall thickness, which essentially depends on the shape of the inner tube wall.
Als vorteilhafte Formen der Breitseiten des Tauchgießrohres werden vorgeschlagen, eine keilförmige Ausgestaltung mit gegen die Strömung weisender Spitze oder ein sog. Taylor-Wulst. Hierbei handelt es sich um einen aus dem Schiffbau bekannten Bugwulst, also eine wulstartige Verdickung an der Außenwand.Advantageous forms of the broad sides of the immersion pouring tube are proposed a wedge-shaped configuration with the tip pointing against the flow or a so-called. Taylor bead. This is a bow bulge known from shipbuilding, a bulge-like thickening on the outer wall.
Losgelöst von den genannten Formen der Rohraußenwand des Tauchgießrohres wird vorgeschlagen, die Breitseite der Rohrinnenwand des Tauchgießrohres mit einer konischen Erweiterung auszugestalten, vorzugsweise mit einem Neigungswinkel von 4° bis 7°. Hierdurch wird auf die Strömung im Bereich des Gießspiegels in der Weise Einfluß genommen, daß dieser in besonderer Weise ruhig strömt. Die besondere Ausgestaltung der Breitseitenaußenkontur des Tauchgießrohres kann anschließend optimal Einfluß auf die Strömung in dem Freiraum zwischen Tauchrohrlängsseiten und Kokillenlängsseiten nehmen.It is detached from the above-mentioned forms of the outer tube wall of the immersion pouring tube proposed the broad side of the inner tube wall of the immersion pouring tube with a conical Design extension, preferably with an inclination of 4 ° to 7 °. In this way, the flow in the area of the casting mirror is influenced in this way taken that this flows calmly in a special way. The special design the broadside outer contour of the immersion pouring tube can then have an optimal influence on the flow in the space between the sides of the dip tube and the sides of the mold to take.
Beispiele der Erfindung sind in der beigefügten Zeichnung dargelegt. Dabei zeigen die
- Fig. 1
- einen Schnitt durch zwei Ausführungen der Kokille und des Tauchgießrohres horizontal und vertikal mit Sicht auf Breitseiten
- Fig. 2 und Fig. 3
- Längsschnitte und Mündungsquerschnitte verschiedener Ausgestaltungen.
- Fig. 1
- a section through two versions of the mold and the immersion tube horizontally and vertically with a view of broad sides
- 2 and 3
- Longitudinal sections and muzzle cross sections of different designs.
In allen drei Figuren ist ein Tauchgießrohr 10 dargestellt, dessen Rohrinnenwand mit
11 und die Rohraußenwand mit 12, der gießbehälterseitige Bereich mit 13 und der
Mündungsbereich mit 14 bezeichnet ist. Der gießbehälterseitige Bereich 13 ist rohrförmig
ausgestaltet und an einen nicht dargestellten Gießbehälter angeschlossen. Der
Mündungsbereich weist eine im wesentlichen flachgedrückte Form auf, deren kokillenbreitseitiger
Bereich 16 deutlich kürzer ist als der kokillenlängsseitige Bereich 17.In all three figures, an
Die Figur 1 zeigt einen Schnitt durch eine Kokille 20, die Kokillenlängsseiten 21 und
Kokillenbreitseiten 22 besitzt. FIG. 1 shows a section through a
Im Zentrum der Kokille 20 ist das Tauchgießrohr 10 angeordnet. Im rechten Teil der
oberen Darstellung der Figur 1 besitzt das Tauchgießrohr 10 eine rechteckige Querschnittsgestalt.
Vor dem kokillenbreitseitigen Bereich 16 ist ein als Keil 32 ausgestaltetes
Formelement 31 angeordnet. Die Kokillenlängsseiten verlaufen hierbei im wesentlichen
parallel.
Die Distanz der Rohraußenwand 12 zur, die maximale Kokillenbreite B besitzenden inneren
Kokillenlängsseite 21 ist mit d bezeichnet.
Die linke Seite des Tauchgießrohres 10 des horizontalen Schnittes der Figur 1 ist
bootskörperförmig 35 ausgestaltet. Das Tauchgießrohr 10 weist mittig ein keilförmiges
Bodenstück 18 auf. Bei dieser Ausführungsvariante ist die Kokille bombiert.The
The distance of the tube
The left side of the
Im linken Teil ist skizzenhaft die Strömung dargelegt. Das Flüssigmaterial steigt im
Bereich der Kokillenbreitseite zur Badoberfläche, hier dargestellt durch Pfeilspitzen.
Von dort bewegt sich der Strom in Richtung Tauchgießrohr, gleichmäßig geteilt durch
die Spitze der bootskörperförmig ausgestalteten Breitseite des Tauchgießrohres. In
der Mitte der Längsseite des Tauchgießrohres (dargestellt durch die Pfeilenden) bewegt
sich der Flüssigstahlstrom in Strangabzugsrichtung.
Der untere Bereich der Figur 1 zeigt vertikale Schnitte durch die Kokille und das
Tauchrohr, und zwar den Schnitt CC durch eine bombierte Kokille und EE durch eine
Kokille mit parallel geführten Seitenwänden.
In beiden Fällen ist unabhängig von der Ausgestaltung der Rohrinnenwand 11 die
Rohraußenwand 12 so ausgestaltet, daß sie bei unterschiedlicher Eintauchtiefe in die
Kokille bzw. die Schmelze eine konstante Distanz d zur Innenwandung der Kokillenlängsseite
21 aufweist.The current is sketched in the left part. The liquid material rises in the area of the mold broadside to the bath surface, shown here by arrowheads. From there, the current moves in the direction of the immersion pouring tube, evenly divided by the tip of the boat-shaped broad side of the immersion pouring tube. In the middle of the long side of the immersion pouring tube (represented by the arrow ends), the liquid steel flow moves in the direction of the strand withdrawal.
The lower area of FIG. 1 shows vertical sections through the mold and the dip tube, specifically the section CC through a cambered mold and EE through a mold with parallel side walls.
In both cases, regardless of the design of the
Die Figuren 2 und 3 weisen einen Schnitt durch ein Tauchgießrohr 10, das mündungsseitig
eine konische Erweiterung 15 aufweist, in der mittig ein keilförmiges Bodenstück
18 vorgesehen ist. Der Neigungswinkel beträgt 4° bis 20°.Figures 2 and 3 have a section through a
In der Figur 2 ist die Rohraußenwand 12 des Tauchgießrohres in dem in die Schmelze
eintauchenden Bereich tauchrohrbreitseitig in der Weise ausgestaltet, daß der horizontalen
Strömung der Stahlschmelze und dem auf ihr schwimmenden Gießpulver ein
minimaler Widerstand entgegengesetzt wird. Auf der linken Seite ist dabei die Rohraußenwand
12 bootskörperförmig 35 in einer Spitze endend geführt, auf der rechten
Seite ist ein ebenfalls aus der Schiffahrt bekannter Taylor-Wulst 34 vorgesehen. Beide
Formelemente sind auch bei konstanter Wandstärke des Tauchrohres (gestrichelte
Linie) ausgestaltbar.In Figure 2, the
Die Figur 3 zeigt ein Tauchgießrohr 10, bei dem die Formelemente 31 als selbständige
Bauteile ausgestaltet sind, die durch Haltevorrichtungen 37 wie auf der linken Seite
oder durch einen Haltesteg 38 wie auf der rechten Seite am Tauchgießrohr befestigt
sind. Das Tauchgießrohr 10 weist eine konstante Wanddicke auf. Die als selbständige
Bauteile ausgestalteten Formelemente 31 können beliebige Querschnittsformen besitzen,
dargestellt ist im linken Teil eine halbkreisförmige Außenkontur 31 und im rechten
Teil die Form eines Keils 32. FIG. 3 shows an
- 1010th
- TauchgießrohrImmersion pouring tube
- 1111
- RohrinnenwandInner pipe wall
- 1212th
- RohraußenwandOuter pipe wall
- 1313
- gießbehälterseitiger Bereicharea on the casting container side
- 1414
- MündungsbereichMouth area
- 1515
- konische Erweiterungconical extension
- 1616
- TauchrohrbreitseiteDip tube broadside
- 1717th
- TauchrohrlängsseiteLong pipe side
- 1818th
- keilförmiges Bodenstückwedge-shaped base piece
- 2020th
- KokilleMold
- 2121
- KokillenlängsseiteLong side of the mold
- 2222
- KokillenbreitseiteMold broadside
- 2323
- StrömungskörperFlow body
- 3131
- FormelementeForm elements
- 3232
- Keilwedge
- 3333
- HalbkreisSemicircle
- 3434
- Taylor-WulstTaylor bead
- 3535
- bootskörperförmigboat-shaped
- 3636
- rechteckigrectangular
- 3737
- Halterungbracket
- 3838
- HaltestegLanding stage
- BB
- KokillenbreiteMold width
- cc
- Abstand Formelemente TauchgießrohrDistance form elements immersion pouring tube
- dd
- Distanz Tauchgießrohraußenwand KokilleninnenwandDistance of the outer pouring tube wall of the mold inner wall
- αα
- NeigungswinkelAngle of inclination
- ββ
- KeilwinkelWedge angle
Claims (7)
- An apparatus for continuously casting steel, consisting of a submerged casting tube with an oblong cross section and a continuous casting mould comprising lengthwise sides and widthwise sides, in particular for casting thin slabs, wherein the submerged casting tube is connected at one end to a casting vessel and at the other end projects into the mould to such an extent that, during casting operation, the mouth is immersed in the steel melt located in the mould,
wherein the outer wall (12) of the submerged casting tube (10) exhibits a shape, in its lengthwise side area (17) facing the lengthwise side (21) of the mould, which exhibits a constant distance (d) from the lengthwise sides (21) of the mould irrespective of the depth to which the submerged casting tube is immersed in the melt located in the continuous casting mould and the outer wall (12) of the submerged casting tube (10) comprises shaped elements (31), in its widthwise side areas (16) facing the widthwise sides (22) of the mould, which exhibit the shape of a wedge (32) with an apex or Taylor bead (34) oriented counter to flow, such that they present minimal resistance to horizontal flow of the steel melt and the casting powder floating thereon. - A submerged casting tube according to claim 1,
characterised in that
the tube outer wall (12) of the lengthwise side area (17) is a surface equidistant from the lengthwise side (21) of the mould and the tube inner wall (11) takes the form of a flat surface. - A submerged casting tube according to claim 2,
characterised in thatthe inner wall (11) on the widthwise side (16) of the submerged casting tube comprises a conically widened portion (15) andthe angle of inclination (α) of the conically widened portion (15) is α = 4° to 20°. - A submerged casting tube according to one of the above-mentioned claims,
characterised in that
the distance (d) from the outer wall (12) of the submerged casting tube (10) to the maximum mould width (B) has the value d = 0.15 to 0.3. - A submerged casting tube according to claim 1,
characterised in that
the wedge angle of the shaped element (31) in the form of a wedge (32) is β = 30° to 60°. - A submerged casting tube according to one of the preceding claims,
characterised in that
the shaped elements (31) are independent components, which are attached to the outer wall (12) of the submerged casting tube (10) by retaining elements (37, 38). - A submerged casting tube according to claim 6,
characterised in that
the shaped elements (31) in the form of independent components are spaced by a distance (c) = 3 to 10 mm from the outer wall (12) of the submerged casting tube (10).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4436990A DE4436990C1 (en) | 1994-10-07 | 1994-10-07 | Immersed pouring pipe where the outer wall acts as a spacer |
| DE4436990 | 1994-10-07 | ||
| PCT/DE1995/001266 WO1996011078A1 (en) | 1994-10-07 | 1995-09-07 | Immersed pouring spout |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0784523A1 EP0784523A1 (en) | 1997-07-23 |
| EP0784523B1 true EP0784523B1 (en) | 2000-07-12 |
Family
ID=6530933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95930397A Expired - Lifetime EP0784523B1 (en) | 1994-10-07 | 1995-09-07 | Immersed pouring spout |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5775552A (en) |
| EP (1) | EP0784523B1 (en) |
| JP (1) | JP3188473B2 (en) |
| KR (1) | KR100364687B1 (en) |
| CN (1) | CN1068261C (en) |
| AT (1) | ATE194531T1 (en) |
| AU (1) | AU3379695A (en) |
| BR (1) | BR9509232A (en) |
| DE (2) | DE4436990C1 (en) |
| RU (1) | RU2127171C1 (en) |
| WO (1) | WO1996011078A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10113026C2 (en) * | 2001-03-17 | 2003-03-27 | Thyssenkrupp Stahl Ag | Immersion tube for pouring molten metal, especially molten steel |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1284035B1 (en) * | 1996-06-19 | 1998-05-08 | Giovanni Arvedi | DIVER FOR CONTINUOUS CASTING OF THIN SLABS |
| IT1287156B1 (en) * | 1996-11-12 | 1998-08-04 | Giovanni Arvedi | PERFECTED SET OF EQUIPMENT FOR CONTINUOUS CASTING AT HIGH SPEED OF THIN SHEETS OF GOOD QUALITY |
| US6125916A (en) * | 1996-11-12 | 2000-10-03 | Giovanni Arvedi | Apparatus for the high-speed continuous casting of good quality thin steel slabs |
| IT1290931B1 (en) * | 1997-02-14 | 1998-12-14 | Acciai Speciali Terni Spa | FEEDER OF MELTED METAL FOR INGOT MACHINES OF CONTINUOUS CASTING MACHINES. |
| DE10009073A1 (en) * | 1999-11-10 | 2001-05-17 | Sms Demag Ag | Mold has a funnel-shaped casting region having cooled wide side walls and narrow side walls with the region tapering in the casting direction to format the casting strand |
| ATE336319T1 (en) * | 2003-03-17 | 2006-09-15 | Vesuvius Crucible Co | NOZZLE WITH SUBMERGED INLET AND DYNAMIC STABILIZATION |
| DE102009012985A1 (en) * | 2009-03-12 | 2010-09-23 | Salzgitter Flachstahl Gmbh | Casting nozzle for a horizontal strip casting plant |
| CN108856693B (en) * | 2017-05-15 | 2022-04-29 | 维苏威高级陶瓷(中国)有限公司 | Asymmetric slab gate |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1959097C2 (en) * | 1969-11-20 | 1973-10-04 | Mannesmann Ag, 4000 Duesseldorf | Device in continuous casting for distributing eggs molten steel |
| DE2442187A1 (en) * | 1974-09-02 | 1976-03-11 | Mannesmann Ag | SUBMERSIBLE SPOUT FOR USE IN CONTINUOUS CASTING PLANTS |
| GB8814331D0 (en) * | 1988-06-16 | 1988-07-20 | Davy Distington Ltd | Continuous casting of steel |
| DE4032624A1 (en) * | 1990-10-15 | 1992-04-16 | Schloemann Siemag Ag | SUBMERSIBLE PIPE FOR INLETING STEEL MELT IN A CONTINUOUS MOLD |
| DE4142447C3 (en) * | 1991-06-21 | 1999-09-09 | Mannesmann Ag | Immersion nozzle - thin slab |
| AT400935B (en) * | 1994-07-25 | 1996-04-25 | Voest Alpine Ind Anlagen | SUBMERSIBLE PIPE |
-
1994
- 1994-10-07 DE DE4436990A patent/DE4436990C1/en not_active Expired - Fee Related
-
1995
- 1995-09-07 EP EP95930397A patent/EP0784523B1/en not_active Expired - Lifetime
- 1995-09-07 US US08/817,320 patent/US5775552A/en not_active Expired - Fee Related
- 1995-09-07 WO PCT/DE1995/001266 patent/WO1996011078A1/en active IP Right Grant
- 1995-09-07 AT AT95930397T patent/ATE194531T1/en not_active IP Right Cessation
- 1995-09-07 JP JP51224396A patent/JP3188473B2/en not_active Expired - Fee Related
- 1995-09-07 DE DE59508571T patent/DE59508571D1/en not_active Expired - Fee Related
- 1995-09-07 RU RU97107331A patent/RU2127171C1/en not_active IP Right Cessation
- 1995-09-07 CN CN95195539A patent/CN1068261C/en not_active Expired - Fee Related
- 1995-09-07 KR KR1019970701985A patent/KR100364687B1/en not_active IP Right Cessation
- 1995-09-07 BR BR9509232A patent/BR9509232A/en not_active IP Right Cessation
- 1995-09-07 AU AU33796/95A patent/AU3379695A/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10113026C2 (en) * | 2001-03-17 | 2003-03-27 | Thyssenkrupp Stahl Ag | Immersion tube for pouring molten metal, especially molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3379695A (en) | 1996-05-02 |
| KR100364687B1 (en) | 2003-02-05 |
| ATE194531T1 (en) | 2000-07-15 |
| US5775552A (en) | 1998-07-07 |
| CN1068261C (en) | 2001-07-11 |
| DE59508571D1 (en) | 2000-08-17 |
| BR9509232A (en) | 1998-01-27 |
| RU2127171C1 (en) | 1999-03-10 |
| JP3188473B2 (en) | 2001-07-16 |
| WO1996011078A1 (en) | 1996-04-18 |
| JPH10506847A (en) | 1998-07-07 |
| EP0784523A1 (en) | 1997-07-23 |
| DE4436990C1 (en) | 1995-12-07 |
| CN1160369A (en) | 1997-09-24 |
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