EP1196258B1 - Device for purifying steel melts - Google Patents
Device for purifying steel melts Download PDFInfo
- Publication number
- EP1196258B1 EP1196258B1 EP00936718A EP00936718A EP1196258B1 EP 1196258 B1 EP1196258 B1 EP 1196258B1 EP 00936718 A EP00936718 A EP 00936718A EP 00936718 A EP00936718 A EP 00936718A EP 1196258 B1 EP1196258 B1 EP 1196258B1
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- EP
- European Patent Office
- Prior art keywords
- chamber
- pouring
- inert gas
- steel
- melt
- 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
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- 239000000161 steel melt Substances 0.000 title claims abstract description 21
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 239000011261 inert gas Substances 0.000 claims description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000001603 reducing effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims 2
- 238000002309 gasification Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 23
- 239000010959 steel Substances 0.000 description 23
- 230000008018 melting Effects 0.000 description 13
- 238000002844 melting Methods 0.000 description 13
- 239000002893 slag Substances 0.000 description 9
- 230000000873 masking effect Effects 0.000 description 7
- IWZSHWBGHQBIML-ZGGLMWTQSA-N (3S,8S,10R,13S,14S,17S)-17-isoquinolin-7-yl-N,N,10,13-tetramethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-amine Chemical compound CN(C)[C@H]1CC[C@]2(C)C3CC[C@@]4(C)[C@@H](CC[C@@H]4c4ccc5ccncc5c4)[C@@H]3CC=C2C1 IWZSHWBGHQBIML-ZGGLMWTQSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000001914 calming effect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000003958 fumigation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 150000003568 thioethers Chemical class 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Definitions
- the invention relates to a device for cleaning Melting steel, especially in continuous casting plants, with one Intermediate container (tundish) used to load a mold serves with molten steel from a ladle, the Intermediate tank internals to equalize the flow which has molten steel.
- Oxidation of the aluminum forms alumina (Al 2 O 3 ), which accounts for the majority (> 90%) of the impurities in the steel.
- the total alumina content must be low for steel grades with high purity requirements.
- individual large alumina particles macroscopic inclusions from 50 to over 500 ⁇ m in diameter
- the endogenous oxides generated during deoxidation in the steel mill can be minimized through process control and purity treatment, with outlier melting occurring again and again.
- exogenous oxides can only be used in the intermediate container effective separation technology can be used because that Separation of alumina particles in the mold or in the strand is only in depending on the casting process, solidification time and throughput possible to a small extent.
- the oxide content (essentially Al 2 O 3 ) must be reduced overall.
- One way to achieve this is to make the flow in the intermediate container more uniform and thus to calm it down, which enables the alumina particles to rise and be molded into an alumina-receiving top slag.
- An intermediate container is described in WO 95 06534 A, which is formed by transverse walls is divided into a pouring, a middle and a casting chamber.
- the Middle chamber is a narrow one in the middle with a distance to the transverse walls Bottom wall with openings in the middle for the introduction of inert gas to the Cleaning the molten steel to flush impurities upwards.
- the object is solved by the features of claim 1 Compared to the state of the art, twice the number of installations in the area a calming effect between the inflow and outflow point of the molten steel the turbulent flow prevailing in the inflow chamber in the middle and casting chamber. To do this, the first and second transverse wall and the targeted arranged openings of the same and the bottom wall of the middle chamber.
- the middle chamber has a cover plate.
- the cover plate creates the possibility of gassing the melting level of the middle chamber.
- Their bottom wall offers space for the adjustable inert gas supply and the inert gas spray bars. This means that the steel melt is purged in stages with insrfgas possible, whereby all alumina particles> 50 ⁇ m are flushed up and in the Pot slag can be separated. The latter is due to the inert gas in the formation protected by exogenous oxides.
- the pouring chamber is a cylindrical pouring sleeve with a lid, in the middle of an opening for a shadow pipe of the ladle is provided, which Shadow tube opposite the cover sealing play and opposite the Pouring sleeve has a distance.
- the opposite of that Pouring sleeve sealed with a shade tube allows fumigation the melting level of the same via an inert gas supply and thereby dispensing with masking compounds within the Injection sleeve. This means that when changing the ladle with under the shadow tube lowered melting level no slag or masking compound through the free Schaelzstrahl in the Melt can be flushed in.
- the advantage is that the casting chamber at its bottom, preferably in the end region of the intermediate container, a pouring tube for filling the mold, that of a stopper is mastered.
- the pouring tube lies in an area of the Casting chamber where the flow calms down and the steel melt is tempered.
- the insulating top slag prevents the formation of exogenous oxides and absorbs alumina residues.
- An advantageous solution is also that before Filling the intermediate container with molten steel on the bottom a starting aid in the pouring chamber below the pouring sleeve and another starting aid made of sheet metal or in front of the floor opening fireproof material are provided.
- the jump start made of sheet metal delays the flow of liquid steel from the Pouring chamber into the middle chamber while the sheet is still has not melted. If the melting level is above the Bottom opening of the first transverse wall, the floats Jump start made of fireproof material.
- FIG. 1 an intermediate container 1 is shown through a first transverse wall 2 in a pouring chamber 3 and through a second transverse wall 4 into a central chamber 5 and a casting chamber 6 is divided.
- a ladle 7 has a shadow pipe 8, that opens into the pouring chamber 3.
- the middle chamber 5 has a bottom wall 9 in which controllable inert gas feeds 10 are arranged, which Inert gas spray bars 11 with the central chamber 5 in Flow connection.
- the middle chamber 5 a cover plate 12.
- first transverse wall 2 there are one in the area of the floor wall 9 Bottom opening 13 and another in the second transverse wall 4 Bottom opening 14 and further openings 15 are provided.
- the casting chamber 6 has at its bottom in the end region of the Intermediate container 1, a pouring tube 16 for filling the mold on, which is controlled by a plug 17.
- the intermediate container 1 is filled with a molten steel 18, whose mirror is covered by a masking compound 19. This is different for the individual chambers 3, 5, 6.
- the Cover layer of the pouring chamber 3 takes floating large Particle that is the cover layer of the middle chamber 5 thin and takes all those blown up by inert gas Particles on, while the covering of the casting chamber 6 den Seals the melting level against the ingress of air.
- Figure 2 differs from Figure 1 by, among other things a cylindrical pouring sleeve 20 which has a cover 21st has, in the middle of which there is an opening for a shadow pipe 8 is provided, the 21 seal play against the lid and has a distance from the pouring sleeve 20.
- the Melting level within the pouring sleeve 20 does not carry any Masking compound 19, but is through an inert gas inflow 22nd fumigated.
- the melting level inside the middle chamber 5 is also gassed by an inert gas inflow 22 and with a top slag with a reducing effect. Besides, that is Steel melt 18 of the middle chamber 5 by an electrical Heating element 23 heated.
- a starting aid 24 and in front of the bottom opening 13 another jump starter 25 is provided which is made of sheet metal or fireproof material. These starting aids delay the Flow from the pouring chamber 3 into the middle chamber 5 at Filling the intermediate container 1.
- the molten steel 18 is from the ladle 7 on the Shadow tube 8 filled in the intermediate container 1. This serves as a buffer to avoid the casting process when changing pans To be able to continue the interruption. He also offers the Possibility of further cleaning the molten steel 18.
- the intermediate container 1 in the pouring chamber 3 has a pouring sleeve 20 which Shadow tube 8 seals with its cover 21 and the together with the shadow pipe 8 in the molten steel 18th dips.
- the other starting aid 25 consists of sheet metal that melts or made of refractory material that floats in the melt and so the meltdown clears the way into the middle chamber 5.
- the intermediate container 1 When the intermediate container 1 is filled, it develops in and under the pouring sleeve 20 through the from the shadow pipe 8th escaping pouring stream a short shot flow 26 leading to Deposition of large particles of slag and alumina results. This get into the covering compound 19 of the melt level Inflow chamber and are recorded there.
- the melting level is free of Masking compound 19.
- the inert gas inflow 22 Fumigation of the upper part of the pouring sleeve 20 instead, whereby there is no oxide formation at this point.
- Inert gas bubbles usually made of argon or nitrogen, get into the molten steel 18, but this is completely uncritical is.
- the pre-cleaned emerging from the pouring chamber 3 Steel melt 18 passes through the bottom opening 13 in the Middle chamber 5 and further through the other bottom opening 14 as well as the further openings 15 into the casting chamber 6.
- inert gas emerges from the Inert gas spray strips 11 and pearls in the molten steel 18 high. Depending on the inert gas pressure, they are of different sizes Alumina particles in the area above 50 ⁇ m are flushed up and into the Masking compound 19, a reducing top slag, added.
- the inert gas collects under the cover plate 12 and can there are supplemented by an inert gas inflow 22.
- On Electric heating element 23 is used to set the optimum casting temperature in the casting chamber 6.
- the molten steel 18 of the casting chamber 6 has a covering compound 19 made of insulating top slag. Occurs in the casting chamber 6 a calming of the flow and moderation of the Steel melt 18, so that through the pouring tube 16 of the Stopper 17 controls a cleaned, homogeneous steel melt 18 flows into the mold and there to a quality steel stiffens.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Reinigung von Stahlschmelzen, insbesondere bei Stranggussanlagen, mit einem Zwischenbehälter (Tundish), der zur Beschickung einer Kokille mit Stahlschmelze aus einer Gießpfanne dient, wobei der Zwischenbehälter Einbauten zur Vergleichmäßigung der Strömung der Stahlschmelze aufweist.The invention relates to a device for cleaning Melting steel, especially in continuous casting plants, with one Intermediate container (tundish) used to load a mold serves with molten steel from a ladle, the Intermediate tank internals to equalize the flow which has molten steel.
Stahlschmelzen für Stranggießanlagen werden bevorzugt durch Zugabe von Aluminium beruhigt. In Sonderfällen wird zusätzlich Calzium zugegeben, um eine Einformung von Sulfiden und eine BeeinfLussung der Oxide zur Verbesserung der Vergießbarkeit zu erreichen.Steel melts for continuous casting plants are preferred by Adding aluminum calms down. In special cases, additional Calcium added to an indentation of sulfides and a Influencing the oxides to improve the castability to reach.
Durch Oxidation des Aluminiums bildet sich Tonerde (Al2O3), die den Hauptteil (> 90 %) der Verunreinigungen im Stahl ausmacht. Für Stahlsorten mit hoher Reinheitsanforderung muss der Gesamttonerdegehalt gering sein. Aber auch einzelne große Tonerdeteilchen (makroskopische Einschlüsse von 50 bis über 500 µm Durchmesser) dürfen im Fertigprodukt nicht enthalten sein. Die bei der Desoxidierung im Stahlwerk entstehenden endogenen Oxide können durch Prozessführung und Reinheitsgrad-Behandlung minimiert werden, wobei Ausreißer-Schmelzen immer wieder auftreten. Oxidation of the aluminum forms alumina (Al 2 O 3 ), which accounts for the majority (> 90%) of the impurities in the steel. The total alumina content must be low for steel grades with high purity requirements. However, individual large alumina particles (macroscopic inclusions from 50 to over 500 µm in diameter) must not be contained in the finished product. The endogenous oxides generated during deoxidation in the steel mill can be minimized through process control and purity treatment, with outlier melting occurring again and again.
Die nach der im Stahlwerk erfolgten Schmelzenbehandlung durch unerwünschte Sauerstoffzufuhr neu entstehenden exogenen Oxide sind nur mit erheblichem Aufwand zu verhindern. Ursachen für deren Bildung sind undichte Schiebersysteme, mangelnde Sauberkeit der Gießpfanne (sauerstoffhaltige Reste), ungenügende Abdeckung des Schmelzspiegels, Sauerstoff aus dem feuerfesten Material, der Gießstart und der Gießpfannenwechsel.The after the melt treatment in the steel mill unwanted oxygen supply newly emerging exogenous oxides can only be prevented with considerable effort. Reasons for their formation are leaky slide systems, insufficient Cleanliness of the ladle (residues containing oxygen), insufficient coverage of the melting level, oxygen from the refractory material, the pouring start and the Gießpfannenwechsel.
Gegen diese exogenen Oxide kann nur noch im Zwischenbehilter eine wirksame Abscheidetechnik eingesetzt werden, denn das Abscheiden von Tonerdeteilchen in der Kokille oder im Strang ist je nach Gießprozess, Erstarrungszeit und Durchsatz nur in geringem Maße möglich.These exogenous oxides can only be used in the intermediate container effective separation technology can be used because that Separation of alumina particles in the mold or in the strand is only in depending on the casting process, solidification time and throughput possible to a small extent.
Um die bekannte Anhäufung von Tonerdeteilchen mittlerer Große in bestimmten Bereichen der Brammen zu vermindern, muss der Oxidgehalt (im wesentlichen Al2O3) insgesamt reduziert werden. Ein Weg dahin ist eine Vergleichmäßigung und damit eine Beruhigung der Strömung im Zwischenbehälter, die ein Aufsteigen der Tonerdeteilchen und deren Einformung in eine Tonerde-aufnehmende Top-Schlacke ermöglicht.In order to reduce the known accumulation of medium-sized alumina particles in certain areas of the slab, the oxide content (essentially Al 2 O 3 ) must be reduced overall. One way to achieve this is to make the flow in the intermediate container more uniform and thus to calm it down, which enables the alumina particles to rise and be molded into an alumina-receiving top slag.
Im Handbuch von K. Schwerdtfeger: "Metallurgie des Stranggießens", Verlag Stahleisen 1992 ist auf Seite 218 in Bild 3.1.9 der Einfluss von Einbauten, wie wehre und Dämme auf die Strömungsausbildung im Zwischenbehälter dargestellt. Ein Maß für die Gleichmäßigkeit der Strömung ist die Verweildauer eines Volumenelementes im Zwischenbehälter. Diese konnte durch die Einbauten um das vierfache gesteigert werden. Dieser Wert liegt jedoch um fast den gleichen Faktor niedriger als der In the handbook by K. Schwerdtfeger: "Metallurgy of the Stranggießens ", Verlag Stahleisen 1992 is on page 218 in Figure 3.1.9 the influence of internals such as weirs and dams the flow formation shown in the intermediate container. On The residence time is a measure of the uniformity of the flow a volume element in the intermediate container. This could go through the internals are increased fourfold. This value however, is almost the same factor lower than that
Zur Vergleichmäßigung und Beruhigung der Strömung der Stahlschmelze wird in PATENT ABSTRACTS OF JAPAN vol.013, no.320 (M-853), 20.Juli 1989 (1989-07-20) & JP 01 107950 A (NKK CORP), 25. April 1989 (1989-04-25) ein Zwischenbehälter mit drei durch zwei Querwände ausgebildeten Kammern vorgeschlagen, bestehend aus einer mittigen Eingießkammer und zwei äußeren Gießkammern. In der mittigen Eingießkammer ist ein sich bis unterhalb der Querwände sich erstreckender Bodenwall angeordnet. Zwischen diesem Bodenwall und den Querwänden befinden sich Öffnungen, durch die Stahlschmelze vergleichmäßigt in die Gießkammern gelangt.In order to equalize and calm the flow of the molten steel, in PATENT ABSTRACTS OF JAPAN vol.013, no.320 (M-853), July 20, 1989 (1989-07-20) & JP 01 107950 A (NKK CORP), April 25, 1989 (1989-04-25) an intermediate container proposed with three chambers formed by two transverse walls, consisting of a central pouring chamber and two outer pouring chambers. In the central pouring chamber there is an up to below the transverse walls extending floor wall arranged. Between this floor and the Cross walls have openings through which the molten steel is evened out gets into the casting chambers.
In der WO 95 06534 A wird ein Zwischenbehälter beschrieben, der durch Querwände in eine Eingieß-, eine Mittel- und eine Gießkammer unterteilt wird. in der Mittelkammer befindet sich mittig mit Abstand zu den Querwänden ein schmaler Bodenwall mit mittig angeordneten Öffnungen zur Einleitung von Inertgas, um zur Reinigung der Stahlschmelze Verunreinigungen nach oben zu spülen.An intermediate container is described in WO 95 06534 A, which is formed by transverse walls is divided into a pouring, a middle and a casting chamber. in the Middle chamber is a narrow one in the middle with a distance to the transverse walls Bottom wall with openings in the middle for the introduction of inert gas to the Cleaning the molten steel to flush impurities upwards.
Es ist Aufgabe der Erfindung, die Geschwindigkeitsverteilung und damit die Verweildauer der Schmelze im Zwischenbehälter einer Stranggießanlage zu optimieren.It is an object of the invention, the speed distribution and thus the length of stay to optimize the melt in the intermediate container of a continuous caster.
Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst
Die im Vergleich zum Stand der Technik doppelte Anzahl der Einbauten im Bereich
zwischen Ein- und Ausströmpunkt der Stahlschmelze bewirkt eine Beruhigung
der in der Einströmkammer herrschenden turbulenten Strömung in der Mittel-
und Gießkammer. Dazu tragen die erste und zweite Querwand und die gezielt
angeordneten Öffnungen derselben sowie der Bodenwall der Mittelkammer bei.The object is solved by the features of
Es ist von Vorteil, dass die Mittelkammer eine Deckplatte aufweist. Die Deckplatte schafft die Möglichkeit einer Begasung des Schmelzspiegels der Mittelkammer. Deren Bodenwall bietet Platz für die regelbaren Inertgaszuführungen und die inerigassprühleisten. Dadurch ist eine gestufte Spülung der Stahlschmelze mit insrfgas möglich, wodurch alle Tonerdeteilchen > 50 µm hochgespült und in der Topfschlacke abgeschieden werden. Letztere wird durch das Inertgas an der Bildung von exogenen Oxiden geschützt.It is advantageous that the middle chamber has a cover plate. The cover plate creates the possibility of gassing the melting level of the middle chamber. Their bottom wall offers space for the adjustable inert gas supply and the inert gas spray bars. This means that the steel melt is purged in stages with insrfgas possible, whereby all alumina particles> 50 µm are flushed up and in the Pot slag can be separated. The latter is due to the inert gas in the formation protected by exogenous oxides.
Eine elektrische Heizung der Schmelze in der Mittelkammer gestattet deren optimale Temperatureinstellung.Electric heating of the melt in the middle chamber allows it to be optimal Temperature setting.
Eine weitere vorteilhafte Weiterbildung der Erfindung besteht darin, dass die Eingießkammer eine zylindrische Eingießhülse mit einem Deckel aufweist, in dessen Mitte eine Öffnung für ein Schattenrohr der Gießpfanne vorgesehen ist, wobei das Schattenrohr gegenüber dem Deckel Dichtspiel und gegenüber der Eingießhülse einen Abstand aufweist. Die gegenüber dem Schattenrohr abgedichtete Eingießhülse gestattet eine Begasung des Schmelzspiegels derselben über eine Inertgaszuführung und dadurch den Verzicht auf Abdeckmassen innerhalb der Eingießhülse. Dadurch kann bei Gießpfannenwechsel mit unter das Schattenrohr abgesenktem Schmelzspiegel keine Schlacke bzw. Abdeckmasse durch den freien Schaelzstrahl in die Schmelze eingespült werden. Beim Ausströmende und Ausströmbeginn befindet sich der Schmelzstrahl in einer Inertgasatmosphäre, so dass auch in dieser kritischen Phase des Gießprozesses die Bildung von exogenen Oxiden vermieden wird. Außerhalb der Eingießhülse ist der Schmelzspiegel durch Abdeckmassen geschützt. Durch die genannten Maßnahmen können hohe Anforderungen an die Reinheit der Stahlschmelze erfüllt werden.Another advantageous development of the invention exists in that the pouring chamber is a cylindrical pouring sleeve with a lid, in the middle of an opening for a shadow pipe of the ladle is provided, which Shadow tube opposite the cover sealing play and opposite the Pouring sleeve has a distance. The opposite of that Pouring sleeve sealed with a shade tube allows fumigation the melting level of the same via an inert gas supply and thereby dispensing with masking compounds within the Injection sleeve. This means that when changing the ladle with under the shadow tube lowered melting level no slag or masking compound through the free Schaelzstrahl in the Melt can be flushed in. At the outflow and The outflow of the melt stream is in a Inert gas atmosphere, so that even in this critical phase the formation of exogenous oxides during the casting process becomes. Outside the pouring sleeve, the melting level is through Masking compounds protected. Through the measures mentioned meets high requirements for the purity of the molten steel become.
Von Vorteil ist, dass die Gießkammer an ihrem Boden, vorzugsweise im Endbereich des Zwischenbehälters, ein Gießrohr zur Befüllung der Kokille aufweist, das von einem Stopfen beherrscht ist. Das Gießrohr Liegt in einem Bereich der Gießkammer, wo die Strömung beruhigt und die Stahlschmelze verglelchmäßigt ist. Die isolierende Topschlacke verhindert die Bildung exogener Oxide und absorbiert Tonerdereste.The advantage is that the casting chamber at its bottom, preferably in the end region of the intermediate container, a pouring tube for filling the mold, that of a stopper is mastered. The pouring tube lies in an area of the Casting chamber where the flow calms down and the steel melt is tempered. The insulating top slag prevents the formation of exogenous oxides and absorbs alumina residues.
Eine vorteilhafte Lösung besteht auch darin, dass vor dem Füllen des Zwischenbehälters mit Stahlschmelze auf dem Boden der Eingießkammer unterhalb der Eingießhülse eine Starthilfe und vor der Bodenöffnung eine andere Starthilfe aus Blech oder feuerfestem Material bestehend vorgesehen sind. Die Starthilfe aus Blech verzögert den Flüssigstahlzufluss aus der Eingießkammer in die Mittelkammer, solange das Blech noch nicht geschmolzen ist. Wenn der Schmelzspiegel oberhalb der Bodenöffnung der ersten Querwand Liegt, schwimmt die Starthilfe aus feuerfestem Material auf.An advantageous solution is also that before Filling the intermediate container with molten steel on the bottom a starting aid in the pouring chamber below the pouring sleeve and another starting aid made of sheet metal or in front of the floor opening fireproof material are provided. The jump start made of sheet metal delays the flow of liquid steel from the Pouring chamber into the middle chamber while the sheet is still has not melted. If the melting level is above the Bottom opening of the first transverse wall, the floats Jump start made of fireproof material.
Weitere Merkmale der Erfindung ergeben sich aus den Ansprüchen und der folgenden Beschreibung sowie den Zeichnungen, in denen ein Ausführungsbeispiel der Erfindung schematisch dargestellt ist.Further features of the invention emerge from the claims and the following description and the drawings in which an embodiment of the invention is shown schematically is.
Es zeigen:
- Fig. 1
- einen Zwischenbehälter mit einer Eingießkammer, einer Mittelkammer und einer Gießkammer,
- Fig. 2
- den Zwischenbehälter nach Fig. 1, jedoch zusätzlich mit einer EingießhüLse und einer Schmelze-Heizung.
- Fig. 1
- an intermediate container with a pouring chamber, a middle chamber and a casting chamber,
- Fig. 2
- 1, but additionally with a pouring sleeve and a melt heater.
In Figur 1 ist ein Zwischenbehälter 1 dargestellt, der durch
eine erste Querwand 2 in eine Eingießkammer 3 und durch eine
zweite Querwand 4 in eine Mittelkammer 5 und eine Gießkammer 6
unterteilt ist. Eine Gießpfanne 7 besitzt ein Schattenrohr 8,
das in die Eingießkammer 3 mündet.In Figure 1, an
Die Mittelkammer 5 weist einen Bodenwall 9 auf, in dem
regelbare Inertgaszuführungen 10 angeordnet sind, die über
Inertgas-Sprühleisten 11 mit der Mittelkammer 5 in
Strömungsverbindung stehen. Außerdem weist die Mittelkammer 5
eine Deckplatte 12 auf.The
In der ersten Querwand 2 sind im Bereich des Bodenwalls 9 eine
Bodenöffnung 13 und in der zweiten Querwand 4 eine andere
Bodenöffnung 14 sowie weitere Öffnungen 15 vorgesehen.In the first
Die Gießkammer 6 weist an ihrem Boden im Endbereich des
Zwischenbehälters 1 ein Gießrohr 16 zur Befüllung der Kokille
auf, das von einem Stopfen 17 beherrscht ist.The
Der Zwischenbehälter 1 ist mit einer Stahlschmelze 18 gefüllt,
deren Spiegel von einer Abdeckmasse 19 bedeckt ist. Diese ist
für die einzelnen Kammern 3, 5, 6 unterschiedLich. Die
Abdeckschicht der Eingießkammer 3 nimmt aufschwimmende große
Teilchen auf, die die Abdeckschicht der Mittelkammer 5 ist
dünnflüssig und nimmt alle durch Inertgas aufgetriebenen
Teilchen auf, während die Abdeckmasse der Gießkammer 6 den
Schmelzspiegel gegen Luftzutritt abdichtet.The
Figur 2 unterscheidet sich von Figur 1 unter anderem durch
eine zylindrische Eingießhülse 20, die einen Deckel 21
aufweist, in dessen Mitte eine Öffnung für ein Schattenrohr 8
vorgesehen ist, das gegenüber dem Deckel 21 Dichtspiel und
gegenüber der Eingießhülse 20 einen Abstand aufweist. Der
Schmelzspiegel innerhalb der Eingießhülse 20 trägt keine
Abdeckmasse 19, sondern ist durch einen Inertgaszufluss 22
begast.Figure 2 differs from Figure 1 by, among other things
a
Der Schmelzspiegel innerhalb der Mittelkammer 5 ist ebenfalls
durch einen Inertgaszufluss 22 begast und mit einer
reduzierend wirkenden Topschlacke versehen. Außerdem ist die
Stahlschmelze 18 der Mittelkammer 5 durch ein elektrisches
Heizelement 23 beheizbar.The melting level inside the
Auf dem Boden der Eingießkammer 3 ist unterhalb der
Eingießhülse 20 eine Starthilfe 24 und vor der Bodenöffnung 13
eine andere Starthilfe 25 vorgesehen, die aus Blech oder
feuerfestem Material bestehen. Diese Starthilfen verzögern den
Durchfluss von der Eingießkammer 3 in die Mittelkammer 5 beim
Befüllen des Zwischenbehälters 1.On the bottom of the pouring
Die Funktion der erfindungsgemäßen Vorrichtung wird nachstehend anhand von Fig. 2 erläutert:The function of the device according to the invention is explained below with reference to FIG. 2:
Die Stahlschmelze 18 wird aus der Gießpfanne 7 über das
Schattenrohr 8 in den Zwischenbehälter 1 gefüllt. Dieser dient
als Puffer, um beim Pfannenwechsel den Gießvorgang ohne
Unterbrechung fortsetzen zu können. Außerdem bietet er die
Möglichkeit, die Stahlschmelze 18 weiter zu reinigen.The
Für hohe Reinheitsansprüche weist der Zwischenbehälter 1 in
der Eingießkammer 3 eine Eingießhülse 20 auf, die das
Schattenrohr 8 mit ihrem Deckel 21 dichtend umschließt und die
zusammen mit dem Schattenrohr 8 in die Stahlschmelze 18
eintaucht.For high purity requirements, the
Vor dem Füllbeginn befinden sich auf dem Boden der
Eingießkammer 3 unterhalb der Engießhülse 20 eine Starthilfe
24 und vor der Bodenöffnung 13 eine andere Starthilfe 25, die
den Durchfluss des Flüssigstahls von der Eingießkammer 3 in
die Mittelkammer 5 beim Befüllen des Zwischenbehälters 1
verzögern. Before the start of filling, there are on the bottom of the
Pouring
Die andere Starthilfe 25 besteht aus Blech, das schmilzt oder
aus feuerfestem Material das in der Schmelze aufschwimmt und
so der Startschmelze den Weg in die Mittelkammer 5 freigibt.The other starting
Bei gefülltem Zwischenbehälter 1 entwickelt sich in und unter
der Eingießhülse 20 durch den aus dem Schattenrohr 8
austretenden Gießstrahl eine Kurzschtussströmung 26, die zur
Abscheidung großer Schlacke- und Tonerdeteilchen führt. Diese
gelangen in die Abdeckmasse 19 des Schmelzspiegels der
Einströmkammer und werden dort aufgenommen.When the
Innerhalb der Eingießhülse 20 ist der Schmelzspiegel frei von
Abdeckmasse 19. Dafür findet über den Inertgaszufluss 22 eine
Begasung des oberen Teils der Eingießhülse 20 statt, wodurch
keine Oxidbildung an dieser Stelle erfolgt. Auf diese Weise
wird verhindert, dass bei sinkendem Schmelzspiegel und dem
dadurch aus dem Schattenrohr austretenden freien
Pfannengießstrahl Luft, Schlacke oder Oxide in die
Stahlschmelze 18 eingespült werden. Lediglich
Inertgasbläschen, in der Regel aus Argon oder Stickstoff,
gelangen in die Stahlschmelze 18, was jedoch völlig unkritisch
ist.Within the pouring
Die aus der Eingießkammer 3 austretende, vorgereinigte
Stahlschmelze 18 gelangt durch die Bodenöffnung 13 in die
Mittelkammer 5 und weiter durch die andere Bodenöffnung 14
sowie die weiteren öffnungen 15 in die Gießkammer 6.The pre-cleaned emerging from the pouring
In der Mittelkammer 5 tritt Inertgas aus den
Inertgassprühleisten 11 aus und perlt in der Stahlschmelze 18
hoch. Dabei werden je nach Inertgasdruck unterschiedlich große
Tonerdeteilchen im Bereich über 50 µm hochgespült und in die
Abdeckmasse 19, einer reduzierenden Topschlacke, aufgenommen.
Das Inertgas sammelt sich unter der Deckplatte 12 und kann
dort durch einen Inertgaszufluss 22 ergänzt werden. Ein
elektrisches Heizelement 23 dient zur Einstellung der
optimalen Gießtemperatur in der Gießkammer 6.In the
Die Stahlschmelze 18 der Gießkammer 6 besitzt eine Abdeckmasse
19 aus isolierender Topschlacke. In der Gießkammer 6 tritt
eine Strömungsberuhigung und Vergleichnäßigung der
Stahlschmelze 18 ein, so dass durch das Gießrohr 16 von dem
Stopfen 17 gesteuert eine gereinigte, homogene Stahlschmelze
18 in die Kokille fließt und dort zu einem Qualitätsstahl
erstarrt.The
Claims (9)
- Device for purifying steel melts, particularly in continuous casting plants, with a tundish (1) which serves for the supply of a chill mould with steel melt (18) from a pouring ladle (7) and which for homogenising the flow of the steel melt (18) is subdivided by two transverse walls (2, 4), which have lower openings (13, 14), into a pouring chamber (3), a middle chamber (5) and a casting chamber (6), wherein the middle chamber (5) has a base wall (9) with openings for gasification of the steel melt (18), characterised in thatthe base wall (9) is so dimensioned that it extends over the entire length of the middle chamber (5) to below the transverse walls (2, 4) and that it is formed with several inert gas spray bars (11) arranged adjacent to one another,the transverse wall (4) separating the middle chamber (5) from the casting chamber (6) has lateral openings (15) andthe middle chamber (5) has a cover plate (12).
- Device according to claim 1, characterised in that regulable inert gas feeds (10), which are disposed in flow connection with the middle chamber (5) by way of inert gas spray bars (11), are provided in the base wall (9).
- Device according to claim 1 or 2, characterised in that the melt is heatable, preferably electrically, in the middle chamber (5).
- Device according to one or more of claims 1 to 3, characterised in that the pouring chamber (3) has a cylindrical pouring sleeve (20) with a cover (21), in the centre of which an opening for a shadow pipe (8) of the pouring ladle (7) is provided.
- Device according to claim 4, characterised in that the shadow pipe (8) has a sealing play relative to the cover (21) and a spacing relative to the pouring sleeve (20).
- Device according to claim 4 or 5, characterised in that the spaces between melt surface and cover (21) or cover plate (12) have an inert gas inflow (22).
- Device according to one or more of claims 1 to 6, characterised in that the casting chamber (6) has at its base, preferably in the end region of the tundish (1), a pouring pipe (16) for filling the chill mould, the pouring tube being controlled by a plug (17).
- Device according to one or more of claims 4 to 7, characterised in that a starting aid (24) is provided on the base of the pouring chamber (3) below the pouring sleeve (20) before filling the tundish (1) with steel melt (18) and another starting aid (25) is provided in front of the base opening, the starting aids consisting of sheet metal or fireproof material.
- Method for purifying steel melts in a tundish (1) which serves for charging a chill mould with steel melt (18) from a pouring ladle (7), particularly in continuous casting plants, according to one or more of the preceding claims 1 to 8, characterised in that a staged washing of the steel melt with inert gas is undertaken in the middle chamber (5) with the help of the regulable inert gas feeds (10) and the inert gas spray bars (11), by which washing the differently sized aluminium oxide particles in the range greater than 50 microns are washed up and taken into the reducing top dross upwardly covering the steel melt (18), whereafter the inert gas collects in the space between the cover plate (12) and the top dross (19) and, supplemented by an inert gas inflow (22), protects the top dross (19) against formation of exogenic oxides.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19922829A DE19922829A1 (en) | 1999-05-19 | 1999-05-19 | Device for purifying steel melts produced from continuous casting plants comprises a tundish divided into a casting chamber by a transversal wall and into a middle chamber and a casting chamber by a further transversal wall |
| DE19922829 | 1999-05-19 | ||
| PCT/EP2000/004074 WO2000071283A1 (en) | 1999-05-19 | 2000-05-06 | Device for purifying steel melts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1196258A1 EP1196258A1 (en) | 2002-04-17 |
| EP1196258B1 true EP1196258B1 (en) | 2003-01-02 |
Family
ID=7908429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00936718A Expired - Lifetime EP1196258B1 (en) | 1999-05-19 | 2000-05-06 | Device for purifying steel melts |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1196258B1 (en) |
| AT (1) | ATE230317T1 (en) |
| AU (1) | AU5211600A (en) |
| DE (2) | DE19922829A1 (en) |
| WO (1) | WO2000071283A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413196B (en) * | 2003-12-02 | 2005-12-15 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING A CAST METAL STRIP OF HIGH PURITY |
| KR101949698B1 (en) | 2017-07-14 | 2019-02-19 | 주식회사 포스코 | Apparatus for treatment molten material |
| CN109954851B (en) * | 2017-12-14 | 2023-05-16 | 鞍钢股份有限公司 | Device for cleaning and heating molten steel slag in tundish and use method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1543798A (en) * | 1976-12-17 | 1979-04-04 | N Proizv Ob Tulatschermet | Horizontal continuous casting of metal |
| JPS5827020B2 (en) * | 1978-08-31 | 1983-06-07 | 川崎製鉄株式会社 | Method for cleaning molten steel in a tandate for continuous casting |
| JPS5626662A (en) * | 1979-08-07 | 1981-03-14 | Kobe Steel Ltd | Method for preventing entry of inclusion in continuous casting of steel |
| JPS5717357A (en) * | 1980-07-04 | 1982-01-29 | Sumitomo Metal Ind Ltd | Manufacturing lead free-cutting steel |
| JPH01107950A (en) * | 1987-10-21 | 1989-04-25 | Nkk Corp | Tundish for horizontal continuous casting |
| JPH03151144A (en) * | 1989-11-08 | 1991-06-27 | Sumitomo Metal Ind Ltd | Method for refining molten steel in tundish for continuous casting |
| AU7234994A (en) * | 1993-08-28 | 1995-03-22 | Foseco International Limited | Purifying molten metal |
-
1999
- 1999-05-19 DE DE19922829A patent/DE19922829A1/en not_active Withdrawn
-
2000
- 2000-05-06 EP EP00936718A patent/EP1196258B1/en not_active Expired - Lifetime
- 2000-05-06 WO PCT/EP2000/004074 patent/WO2000071283A1/en active IP Right Grant
- 2000-05-06 AU AU52116/00A patent/AU5211600A/en not_active Abandoned
- 2000-05-06 AT AT00936718T patent/ATE230317T1/en not_active IP Right Cessation
- 2000-05-06 DE DE50001022T patent/DE50001022D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19922829A1 (en) | 2000-11-23 |
| EP1196258A1 (en) | 2002-04-17 |
| ATE230317T1 (en) | 2003-01-15 |
| DE50001022D1 (en) | 2003-02-06 |
| WO2000071283A1 (en) | 2000-11-30 |
| AU5211600A (en) | 2000-12-12 |
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