EP0462988B1 - Process and device for handling metals in a vacuum - Google Patents
Process and device for handling metals in a vacuum Download PDFInfo
- Publication number
- EP0462988B1 EP0462988B1 EP90903585A EP90903585A EP0462988B1 EP 0462988 B1 EP0462988 B1 EP 0462988B1 EP 90903585 A EP90903585 A EP 90903585A EP 90903585 A EP90903585 A EP 90903585A EP 0462988 B1 EP0462988 B1 EP 0462988B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lid
- vacuum
- free space
- annular
- ladle
- 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
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Definitions
- the invention relates to a method and a device for vacuum treatment of metals, in particular steel, according to the features of the preambles of claims 1 and 3.
- pan degassing the tapping pan filled with steel is lowered into a large cylindrical chamber and then closed by a lid in a vacuum-tight manner .
- a rubber ring is usually used as a seal.
- the lids are made either from steel molds or from sheet metal structures.
- On the underside of the cover there is radiation protection made from sheet metal and / or refractory ramming compound.
- the vacuum generation usually consists of at least four emitters. If a steel melt is exposed to a vacuum, gas bubbles are formed inside the steel with a pressure that is dependent on the internal pressure above the melt surface.
- the unquenched steel with a high oxygen content triggers a boiling effect at the pressure of less than 200 torr in the free space of the vacuum treatment vessel via the formation of carbon oxide and thereby simultaneously flushes the hydrogen and nitrogen out of the molten metal, so that even at this relatively poor vacuum The gases are removed. If the pressure is reduced further, the boiling can become so violent that, for example, molten steel rises 1 meter or more in the pan.
- a sufficient climbing height by choosing a larger pan is required, so the pan cannot be filled to the brim, but must have a so-called freeboard.
- the pan sizes and fill weights are coordinated with the hoists. Due to the requirement of The pans can no longer be filled to the brim on freeboards, with the disadvantage of reduced production.
- the alternative solution, to enlarge the pans means that the lifting devices and holding devices have to be adjusted to the increased transport weight.
- Another solution is a receptacle that depends on the pan.
- DE-OS 20 32 830 a diving body is known which is immersed with the open side at the bottom in the melt and the inside of which is then evacuated.
- This immersion body has the disadvantage that it has to be pressed into the melt in order to obtain the immersion depth required during the vacuum treatment. After the negative pressure is applied, the melt level rises by the barometric difference, which can be well over 1 meter high, while the melt level not occupied by the vacuum drops by a similar amount.
- the melt level rises by the barometric difference, which can be well over 1 meter high, while the melt level not occupied by the vacuum drops by a similar amount.
- DE-AS 19 65 136 discloses a device for ladle degassing of metal melts, in which a reaction tube arranged below the lid of the vacuum treatment vessel can be immersed in the melt. In a complex manner, a lance with reactive gases for metallurgical treatment is guided into the space enclosed by the reaction tube, in which the degassing and thus the increase in volume of the melt is to take place. Due to the uniform negative pressure acting on the surface of the weld pool, it is not possible to safely avoid the increase in volume in the ring area between the reaction tube and the rim of the pan.
- DE-AS 19 12 907 and 19 19 19 053 disclose devices in which gas is introduced into the melt through a tubular partition wall immersed in the melt. This partition is surrounded in a ring by another tubular partition, so that they are in communicating connection. By connecting to pressure and / or suction pumps, the setting of different mirror heights in the individual rooms is achieved at different pressures and this ultimately leads to an improved flow of the metal or bath movement.
- the object of the invention is to find a method and a device for vacuum treatment of metals, in particular steel, which avoid the above-mentioned disadvantages, using simple means, make a freeboard of the pan unnecessary and do not hinder the degassing of the melt.
- the lower open edge of the apron is only slightly immersed in the melt.
- the immersed apron creates two, an annular and a circular, sectors of the molten bath surface, which are subjected to different negative pressures.
- the differential pressure can be set as desired.
- the preferred range is between 1/2 to 2 pressure levels.
- the size of the screen hardly impedes the vacuum change of the entire melt.
- This effect is further improved by the fact that the depth of penetration of the apron is kept to a minimum and assumes values of 10 to 20 cm.
- the space dimensions mentioned and the low immersion depth of the apron only marginally disturb the flow conditions in the melt. This has a particularly advantageous effect at today's high levels Flow rates of the melt pool, caused by large amounts of purge gas, which are introduced into the melt by up to three purge stones.
- the pressure difference can either be tapped directly between two pressure levels or can be set continuously using a branch with throttles.
- FIGS 1 and 1a show a vacuum treatment vessel 30 with a flange and sealing ring, on which a lid 20 rests.
- a pan 40 filled with melt 41 is located in the vacuum treatment vessel 30.
- the lower edge 22 of an apron 21 fastened to the cover 20 is immersed in the melt 41.
- the apron 21 immersed in the molten bath surface divides it into a circular 42 and an annular 43 segment.
- the free space A is enclosed by the circular molten bath surface 42, the inner jacket of the apron 21 and the circular part 23 of the cover 20.
- the remaining part of the lid 20 with the annular part 29, the outer side of the skirt 21, the lower part of the vacuum treatment vessel 30, the outer side of the pan 40 and the annular melt surface 43 comprise the free space B.
- the free space A is connected to the vacuum system 10 via a connection 24 in the area of the circular cover 23 and the free space B via a connection 25 in the area of the annular cover part 29.
- the vacuum generation system 10 has a water ring pump 14, a steam jet 13 (60 Torr) and a condenser 16 between the two, further a steam jet 12 (10 Torr) and a steam jet 11 (0.5 Torr) and a capacitor 15 between the lamps 12 and 13 on.
- the free space A is connected to the maximum vacuum level p1 of the steam jet 11, the free space B in the present case two levels less to the vacuum level p2, between the radiators 13 and 12.
- the level of the circular 42 increases relative to the annular 43 melt surface by the amount a.
- FIG. 1 a has an electrode 60 which projects through the electrode bushing 61 in the region of the circular cover part 23 into the free space A.
- FIG. 2 schematically shows a vertically adjustable apron 21 which is attached to a circular part 23 of the cover 20, the circular part 23 being adjustable relative to the annular part 29 of the cover 20 by means of adjusting elements 51.
- compensators 53 are provided between the annular part 29 and the circular part.
- the connection 25 to the free space B is arranged in the lid 20, in the other case in the lower part of the vacuum treatment vessel 30.
- FIG. 3 shows the essential elements of FIG. 1 with the difference that there is a connection of the connection 24 to the free space A via a branch 26, which is simultaneously connected to the connection 25 of the free space B, between the branch 26 and the connection 25 a throttle 27 is provided.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Furnace Details (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Vakuumbehandlung von Metallen, insbesondere Stahl nach den Merkmalen der Oberbegriffe der Ansprüche 1 und 3. Bei einer sogennanten Pfannenentgasung wird die mit Stahl gefüllte Abstichpfanne in eine große zylindrische Kammer gesenkt und diese daraufhin durch einen Deckel vakuumdicht verschlossen. Als Dichtung dient in der Regel eine Gummiring. Die Deckel werden entweder aus Stahlgußformen oder aus Blechkonstruktionen hergestellt. An der Unterseite der Deckel befindet sich ein Strahlungsschutz aus Blech und/oder feuerfester Stampfmasse. Auf dem Deckel befinden sich Zugabevorrichtungen und Beobachtungsfenster.The invention relates to a method and a device for vacuum treatment of metals, in particular steel, according to the features of the preambles of claims 1 and 3. In the case of so-called pan degassing, the tapping pan filled with steel is lowered into a large cylindrical chamber and then closed by a lid in a vacuum-tight manner . A rubber ring is usually used as a seal. The lids are made either from steel molds or from sheet metal structures. On the underside of the cover there is radiation protection made from sheet metal and / or refractory ramming compound. There are addition devices and observation windows on the lid.
Die Vakuumerzeugung besteht üblicherweise aus mindestens vier Strahlern. Wird eine Stahlschmelze einem Unterdruck ausgesetzt, so bilden sich im Inneren des Stahles Gasblasen mit einem Druck, der vom Innendruck über der Schmelzoberfläche abhängig ist. Der nicht beruhigte Stahl mit hohem Sauerstoffgehalt löst über die Bildung von Kohlenoxid bereits bei Drücken von unter 200 Torr im Freiraum des Vakuumbehandlungsgefäßes eine Kochwirkung aus und spült hierdurch gleichzeitig den Wasserstoff und Stickstoff aus dem schmelzflüssigen Metall heraus, so daß bereits bei diesem relativ schlechten Vakuum eine Entfernung der Gase erfolgt. Bei weiterem Senken des Druckes kann das Kochen derartig heftig werden, daß beispielsweise schmelzflüssiger Stahl 1 Meter und höher in der Pfanne hochsteigt. Eine genügende Steighöhe durch die Wahl einer größeren Pfanne ist erforderlich, die Pfanne kann also nicht bis an ihren Rand gefüllt werden, sondern muß ein sogenanntes Freibord aufweisen. Bei bestehenden Stahlwerksanlagen sind die Pfannengrößer und Füllgewichte mit den Hebezeugen abgestimmt. Durch das Erfordernis des Freibords können die Pfannen nicht mehr bis zum Rand gefüllt werden mit dem Nachteil von Produktionseinbußen. Die Alternativlösung, die Pfannen zu vergrößern, hat zur Folge, daß die Hebezeuge und Aufnahmevorrichtungen an das erhöhte Transportgewicht anzugleichen sind.The vacuum generation usually consists of at least four emitters. If a steel melt is exposed to a vacuum, gas bubbles are formed inside the steel with a pressure that is dependent on the internal pressure above the melt surface. The unquenched steel with a high oxygen content triggers a boiling effect at the pressure of less than 200 torr in the free space of the vacuum treatment vessel via the formation of carbon oxide and thereby simultaneously flushes the hydrogen and nitrogen out of the molten metal, so that even at this relatively poor vacuum The gases are removed. If the pressure is reduced further, the boiling can become so violent that, for example, molten steel rises 1 meter or more in the pan. A sufficient climbing height by choosing a larger pan is required, so the pan cannot be filled to the brim, but must have a so-called freeboard. In existing steelworks, the pan sizes and fill weights are coordinated with the hoists. Due to the requirement of The pans can no longer be filled to the brim on freeboards, with the disadvantage of reduced production. The alternative solution, to enlarge the pans, means that the lifting devices and holding devices have to be adjusted to the increased transport weight.
Eine weitere Lösung bietet ein von der Pfanne abhängiges Aufnahmegefäß. Aus DE-OS 20 32 830 ist ein Tauchkörper bekannt, der mit der offenen Seite zuunterst in die Schmelze eingetaucht wird und dessen Inneres dann evakuiert wird. Dieser Tauchkörper weist den Nachteil auf, daß er in die Schmelze hineingedrückt werden muß, um die während der Vakuumbehandlung erforderliche Tauchtiefe zu erhalten. Nach Anlegen des Unterdrucks steigt der Schmelzenspiegel um den barometrischen Differenzbetrag, der eine Höhe von weit über 1 Meter aufweisen kann, an, während der nicht von dem Vakuum belegte Schmelzenspiegel um einen ähnlichen Betrag absinkt. Durch die Aufnahme von Schmelze in dem im Vergleich zur Pfanne kleineren Tauchkörper wird ein relativ großes Volumen an Schmelze von der in der Pfanne verbleibenden Schmelze getrennt mit dem Nachteil unterschiedlicher Vakuumbeaufschlagung beider Schmelzenanteile.Another solution is a receptacle that depends on the pan. From DE-OS 20 32 830 a diving body is known which is immersed with the open side at the bottom in the melt and the inside of which is then evacuated. This immersion body has the disadvantage that it has to be pressed into the melt in order to obtain the immersion depth required during the vacuum treatment. After the negative pressure is applied, the melt level rises by the barometric difference, which can be well over 1 meter high, while the melt level not occupied by the vacuum drops by a similar amount. By taking up melt in the immersion body, which is smaller in comparison to the pan, a relatively large volume of melt is separated from the melt remaining in the pan, with the disadvantage of different vacuum loading of the two melt parts.
Aus DE-AS 19 65 136 ist eine Vorrichtung zur Pfannenentgasung von Metallschmelzen bekannt, bei der ein unterhalb des Deckels des Vakuumbehandlungsgefäßes angeordnetes Reaktionsrohr in die Schmelze eintauchbar ist. In aufwendiger Weise ist eine Lanze mit reaktionsaktiven Gasen zur metallurgischen Behandlung in den von dem Reaktionsrohr umschlossenen Raum geführt, in dem die Entgasung und damit die Volumenzunahme der Schmelze erfolgen soll. Durch den einheitlichen, auf die Schmelzbadoberfläche wirkenden Unterdruck ist kein sicheres Vermeiden der Volumenzunahme im Ringbereich zwischen Reaktionsrohr und Pfannenrand möglich.DE-AS 19 65 136 discloses a device for ladle degassing of metal melts, in which a reaction tube arranged below the lid of the vacuum treatment vessel can be immersed in the melt. In a complex manner, a lance with reactive gases for metallurgical treatment is guided into the space enclosed by the reaction tube, in which the degassing and thus the increase in volume of the melt is to take place. Due to the uniform negative pressure acting on the surface of the weld pool, it is not possible to safely avoid the increase in volume in the ring area between the reaction tube and the rim of the pan.
Aus der DE-AS 19 12 907 bzw. 19 19 053 sind andererseits Vorrichtungen bekannt, bei denen Gas durch eine in die Schmelze eintauchende rohrförmige Trennwand in die Schmelze eingeführt wird. Diese Trennwand wird ringförmig von einer weiteren rohrförmigen Trennwand umgeben, so daß diese in kommunizierender Verbindung stehen. Durch Anschluß an Druck- und/oder Saugpumpen wird bei unterschiedlichem Druck die Einstellung verschiedener Spiegelhöhen in den einzelnen Räumen erreicht und dies führt letztlich zu einer verbesserten Strömung des Metalles bzw. Badbewegung.DE-AS 19 12 907 and 19 19 053, on the other hand, disclose devices in which gas is introduced into the melt through a tubular partition wall immersed in the melt. This partition is surrounded in a ring by another tubular partition, so that they are in communicating connection. By connecting to pressure and / or suction pumps, the setting of different mirror heights in the individual rooms is achieved at different pressures and this ultimately leads to an improved flow of the metal or bath movement.
Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung zur Vakuumbehandlung von Metallen, insbesondere Stahl, zu finden, die die obengenannten Nachteile vermieden, unter Einsatz einfacher Mittel, ein Freibord der Pfanne entbehrlich machen und die Entgasung der Schmelze nicht behindern.The object of the invention is to find a method and a device for vacuum treatment of metals, in particular steel, which avoid the above-mentioned disadvantages, using simple means, make a freeboard of the pan unnecessary and do not hinder the degassing of the melt.
Die Erfindung löst diese Aufgabe durch die kennzeichnenden Merkmale der Ansprüche 1 und 3.The invention solves this problem by the characterizing features of claims 1 and 3.
Erfindungsgemäß wird der untere offene Rand der Schürze nur geringfügig in die Schmelze eingetaucht. Durch die eingetauchte Schürze entstehen zwei, ein ringförmiger und ein kreisförmiger, Sektoren der Schmelzbadoberfläche, die mit unterschiedlichen Unterdrücken beaufschlagt werden.According to the invention, the lower open edge of the apron is only slightly immersed in the melt. The immersed apron creates two, an annular and a circular, sectors of the molten bath surface, which are subjected to different negative pressures.
Der Differenzdruck läßt sich beliebig einstellen. Der bevorzugte Bereich liegt zwischen 1/2 bis 2 Druckstufen.The differential pressure can be set as desired. The preferred range is between 1/2 to 2 pressure levels.
Durch die Größe des Schirmes, dessen Radius ein Verhältnis zur Breite des ringförmigen Sektors von 8 : 1 bis 122 : 1 aufweist, wird die Vakuumdehandlung der Gesamtschmelze kaum behindert. Verbessert wird dieser Effekt noch dadurch, daß die Eindringtiefe der Schürze auf ein Minimum beschränkt wird und dabei Werte von 10 bis 20 cm annimmt. Die gennanten Raummaße und die geringe Eintauchtiefe der Schürze stören nur unwesentlich die Strömungsverhältnisse in der Schmelze. Dies wirkt sich besonders vorteilhaft bei den heute üblichen hohen Strömungsgeschindigkeiten des Schmelzbades aus, hervorgerufen durch große Spülgasmengen, die durch bis zu drei Spülsteinen in die Schmelze eingebracht werden.The size of the screen, the radius of which has a ratio to the width of the annular sector of 8: 1 to 122: 1, hardly impedes the vacuum change of the entire melt. This effect is further improved by the fact that the depth of penetration of the apron is kept to a minimum and assumes values of 10 to 20 cm. The space dimensions mentioned and the low immersion depth of the apron only marginally disturb the flow conditions in the melt. This has a particularly advantageous effect at today's high levels Flow rates of the melt pool, caused by large amounts of purge gas, which are introduced into the melt by up to three purge stones.
Dieser Effekt kann kaum weiter verbessert werden, wenn der Schirm vertikal verstellbar ausgebildet wird, da in Abhängigkeit von der Füllhöhe der Pfanne die Eintauchtiefe der Schürze in jedem Stadium der Vakuumbehandlung eingestellt werden kann.This effect can hardly be further improved if the screen is designed to be vertically adjustable, since the immersion depth of the apron can be adjusted in each stage of the vacuum treatment depending on the filling height of the pan.
Die Druckdifferenz kann entweder direkt zwischen zwei Druckstufen abgegriffen oder durch den Einsatz einer Abzweigung mit Drosseln stufenlos eingestellt werden.The pressure difference can either be tapped directly between two pressure levels or can be set continuously using a branch with throttles.
In der folgenden Zeichnungen sind Beispiele der Erfindung schematisch dargestellt. Es zeigt:
- Fig. 1
- einen Schnitt durch das Vakuumbehandlungsgefäß mit Ganzdeckel bei Anschluß aus verschiedenen Stufen einer Vakuumerzeugungsanlage,
Fig. 1a die Figur 1 mit zusätzlicher Elektrode zum Freiraum A, - Fig. 2
- ein Vakuumbehandlungsgefäß mit axial bewegbarer Schürze,
- Fig. 3
- den Anschluß des Vakuumbehandlungsgefäßes an die Vakuumerzeugungsstation über Verzweigung und Drossel.
- Fig. 1
- a section through the vacuum treatment vessel with full lid when connecting from different stages of a vacuum generation system,
1a, the figure 1 with additional electrode to the free space A, - Fig. 2
- a vacuum treatment vessel with an axially movable apron,
- Fig. 3
- the connection of the vacuum treatment vessel to the vacuum generation station via branching and throttle.
Die Figuren 1 und 1a zeigen ein Vakuumbehandlungsgefäß 30 mit Flansch und Dichtring, auf dem ein Deckel 20 aufliegt. Im Vakuumbehandlungsgefäß 30 befindet sich eine mit Schmelze 41 gefülle Pfanne 40. In die Schmelze 41 taucht der untere Rand 22 einer am Deckel 20 befestigten Schürze 21.Figures 1 and 1a show a
Die in die Schmelzbadoberfläche eingetauchte Schürze 21 teilt diese in ein kreisförmiges 42 und ein ringförmiges 43 Segment.The
Von der kreisförmigen Schmelzbadoberfläche 42, dem Innenmantel der Schürze 21 und dem kreisförmigen Teil 23 des Deckels 20 wird der Freiraum A umfaßt. Der übrige Teil des Deckels 20 mit dem ringförmigen Teil 29, die Mantelaußenseite der Schürze 21, das Unterteil des Vakuumbehandlungsgefäßes 30, die Außenseite der Pfanne 40 und die ringförmige Schmelzenoberfläche 43 umfassen den Freiraum B.The free space A is enclosed by the circular
Zur Beobachtung der Schmelzenoberflächen 42, 43 sind im Deckel 20 Beobachtungsfenster 33, 34 vorgesehen. Der Freiraum A ist über einen Anschluß 24 im Bereich des kreisförmigen Deckels 23 und der Freiraum B über einen Anschluß 25 im Bereich des ringförmigen Deckelteiles 29 mit der Vakuumanlage 10 verbunden.To observe the
Die Vakuumerzeugungsanlage 10 weist eine Wasserringpumpe 14, einen Dampfstrahler 13 (60Torr) und zwischen beiden einen Kondensator 16 auf, weiterhin einen Dampfstrahler 12 (10 Torr) sowie einen Dampstrahler 11 (0,5 Torr) und zwischen den Strahlern 12 und 13 einen Kondensator 15 auf. Der Freiraum A ist an die maximale Unterdruckstufe p1 des Dampfstrahlers 11, der Freiraum B im vorliefgenden Fall zwei Stufen geringer an die Unterdruckstufe p2, zwischen den Strahlern 13 und 12 angeschlossen.The
Während des Betriebes der Vakuumerzeugungsanlage 10 steigt das Niveau der kreisförmigen 42 relativ zur ringförmigen 43 Schmelzbadoberfläche um den Betrag a an.During the operation of the
Die Figur 1a weist über die oben beschriebene Anlage in Figur 1 hinaus eine Elektrode 60 auf, die durch die Elektrodendurchführung 61 im Bereich des kreisförmigen Deckelteiles 23 hindurch in den Freiraum A ragt.In addition to the system in FIG. 1 described above, FIG. 1 a has an
In Figur 2 ist schematisch eine vertikal verstellbare Schürze 21 dargestellt, die an einem kreisförmigen Teil 23 des Deckels 20 befestigt ist, wobei der kreisförmige Teil 23 relativ zu dem ringförmigen Teil 29 des Deckels 20 mittels Verstellelemente 51 verstellbar ist. Zum gasdichten Abschluß sind zwischen dem ringförmigen Teil 29 und dem kreisförmigen Teil 23 Kompensatoren 53 vorgesehen. Der Anschluß 25 zum Freiraum B ist einmal im Deckel 20, im anderen Fall im Gefäßunterteil des Vakuumbehandlungsgefäßes 30 angeordnet.FIG. 2 schematically shows a vertically
Die Figur 3 zeigt die wesentlichen Elemente der Figur 1 mit dem Unterschied, daß eine Verbindung des Anschlusses 24 zu dem Freiraum A über eine Abzweigung 26 besteht, die gleichzeitig mit dem Anschluß 25 des Freiraumes B verbunden ist, wobei zwischen der Abzweigung 26 und dem Anschluß 25 ein Drossel 27 vorgesehen ist.FIG. 3 shows the essential elements of FIG. 1 with the difference that there is a connection of the
Claims (7)
- A method for the vacuum treatment of metals, in particular steel, in which molten metal is located in a vacuum treatment vessel which is tightly closed by the lid, the surface of the molten metal being separated into a circular sector and into an annular sector which surrounds this and the molten metal being exposed during the vacuum treatment to different underpressures at its surface, characterised in that the annular sector in comparison with the circular sector is acted upon with a smaller underpressure and in that the separation of the sectors is undertaken up to a depth of immersion into the molten bath of between 10 and 20 cm, measured starting from the annular sector.
- A method according to claim 1, characterised in that a difference of the underpressure between the annular sector and the circular sector is selected which corresponds to at least half a pressure stage of the vacuum plant.
- A device for carrying out the method according to claim 1 and 2 a vacuum treatment vessel which has a lid provided with a seal and which is connected to a multi-stage vacuum generation plant, a ladle filled with molten metal being insertable in the vacuum treatment vessel, the lid having a cylindrical apron which is arranged parallel to the centre axis of the lid and the edge region of which, with the ladle filled, projects into the melt and the diameter of which is only slightly smaller than the diameter of the ladle at immersion level, characterised in that connections (24, 25) are provided, communicating with the vacuum plant (10), to the free space (A) which is separated by the apron (21) and which is enclosed by the circular part (23) of the lid (20), the inner jacket of the apron (21) and, with the ladle (40) filled, by the circular melt surface (42) and to the free space (B) which is enclosed by the annular part (29) of the lid (20), the vacuum treatment vessel (30), the ladle (40) and, with the ladle filled, by the annular melt surface (43), the connection (24) to the free space (A) being connected to an ejector (11) having the highest pressure stage of the vacuum plant (10) and the connection (25) to the free space (B) being connected to a portion of the vacuum plant (10) having smaller underpressure than at the connection (24).
- A device according to claim 3, characterised in that a branch (26) which is provided with throttle components (27) and which communicates with the free space (B) is provided at the connection (25) to the free space (A).
- A device according to claim 3, characterised in that the lid (20) has an annular aperture and in that adjusting components (51) are provided on the lid (20) by which the apron (21) is movable parallel to the centre axis (1).
- A device according to claim 5, characterised in that compensators (53) are fastened in a gastight manner between the annular part (29) of the lid (20) and the circular part (23) thereof in the form of that edge of the apron (21) which points away from the ladle (40).
- A device according to any one of claims 3 to 6, characterised in that at least one electrode (60) can be conducted through the lid (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90903585T ATE95250T1 (en) | 1989-02-24 | 1990-02-20 | METHOD AND DEVICE FOR VACUUM TREATMENT OF METALS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3906340A DE3906340A1 (en) | 1989-02-24 | 1989-02-24 | METHOD AND DEVICE FOR VACUUM TREATMENT OF METALS |
| DE3906340 | 1989-02-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0462988A1 EP0462988A1 (en) | 1992-01-02 |
| EP0462988B1 true EP0462988B1 (en) | 1993-09-29 |
Family
ID=6375157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90903585A Expired - Lifetime EP0462988B1 (en) | 1989-02-24 | 1990-02-20 | Process and device for handling metals in a vacuum |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5242485A (en) |
| EP (1) | EP0462988B1 (en) |
| JP (1) | JP2722011B2 (en) |
| KR (1) | KR970005200B1 (en) |
| CN (1) | CN1022115C (en) |
| BR (1) | BR9007161A (en) |
| CA (1) | CA2009923C (en) |
| DE (2) | DE3906340A1 (en) |
| ES (1) | ES2020091A6 (en) |
| WO (1) | WO1990010087A1 (en) |
| ZA (1) | ZA901414B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603749A (en) * | 1995-03-07 | 1997-02-18 | Bethlehem Steel Corporation | Apparatus and method for vacuum treating molten steel |
| DE19518361C1 (en) * | 1995-05-19 | 1996-08-08 | Technometal Ges Fuer Metalltec | Vacuum-tight reaction vessel with a stuffing box for steel processing |
| CN1087034C (en) * | 1999-11-02 | 2002-07-03 | 北京科技大学 | Technology for desulfurizing molten steel in enclosed ladle by spraying powder |
| RU2324744C1 (en) * | 2006-10-05 | 2008-05-20 | Закрытое акционерное общество "Прочность" | Method of steel vacuum refining process in ladle, mechanism (variants) and junction pipe for its implementation |
| CN105624367B (en) * | 2014-12-01 | 2017-07-21 | 鞍钢股份有限公司 | The purifier and method of a kind of control nitrogen content of molten steel |
| RU2651097C2 (en) * | 2016-07-04 | 2018-04-18 | Федеральное государственное унитарное предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П.Бардина" (ФГУП "ЦНИИчермет им.И.П.Бардина") | Device for vacuuming metal |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE550719A (en) * | 1955-09-05 | |||
| DE1804748U (en) * | 1958-02-22 | 1960-01-28 | Hoerder Huettenunion Ag | DEVICE FOR DEGASSING STEEL MELT. |
| DE1583294C2 (en) * | 1967-10-24 | 1974-08-22 | Standard Messo Duisburg | Device for partial degassing of liquid steel by vacuum treatment |
| DE1912936B2 (en) * | 1969-03-14 | 1971-05-19 | DEVICE AND OPERATING PROCEDURE FOR CLEANING AND VACUUM DEGASSING OF MELTED METALS | |
| DE1919053C3 (en) * | 1969-04-15 | 1979-09-27 | Rheinlaender, Paul, Prof. Dr.-Ing., 3340 Wolfenbuettel | Method and device for generating movement in a metal bath |
| FR2037199B1 (en) * | 1969-03-14 | 1974-05-24 | Voest Ag | |
| DE1912907C3 (en) * | 1969-03-14 | 1978-06-29 | Rheinlaender, Paul, Prof. Dr.-Ing., 3340 Wolfenbuettel | Method and device for generating movement in a metal bath, primarily for steel degassing |
| DE1965136B1 (en) * | 1969-12-27 | 1971-02-25 | Standard Messo Duisburg | Device for ladle degassing of steel or other metal melts |
| JPS5110102A (en) * | 1974-07-15 | 1976-01-27 | Sumitomo Metal Ind | Dh oyobi rh shinkudatsugasuho |
| DE2921722C2 (en) * | 1979-05-29 | 1986-06-12 | Leybold-Heraeus GmbH, 5000 Köln | Sluice tube for attachable arc electrodes in vacuum metallurgical systems |
-
1989
- 1989-02-24 DE DE3906340A patent/DE3906340A1/en active Granted
-
1990
- 1990-01-15 ES ES9000090A patent/ES2020091A6/en not_active Expired - Fee Related
- 1990-02-13 CA CA002009923A patent/CA2009923C/en not_active Expired - Fee Related
- 1990-02-20 KR KR1019900702326A patent/KR970005200B1/en not_active IP Right Cessation
- 1990-02-20 BR BR909007161A patent/BR9007161A/en not_active IP Right Cessation
- 1990-02-20 WO PCT/DE1990/000121 patent/WO1990010087A1/en active IP Right Grant
- 1990-02-20 CN CN90100842A patent/CN1022115C/en not_active Expired - Fee Related
- 1990-02-20 JP JP2503587A patent/JP2722011B2/en not_active Expired - Fee Related
- 1990-02-20 EP EP90903585A patent/EP0462988B1/en not_active Expired - Lifetime
- 1990-02-20 US US07/752,654 patent/US5242485A/en not_active Expired - Fee Related
- 1990-02-20 DE DE90903585T patent/DE59002951D1/en not_active Expired - Fee Related
- 1990-02-23 ZA ZA901414A patent/ZA901414B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022115C (en) | 1993-09-15 |
| US5242485A (en) | 1993-09-07 |
| KR920700297A (en) | 1992-02-19 |
| DE59002951D1 (en) | 1993-11-04 |
| DE3906340A1 (en) | 1990-08-30 |
| JP2722011B2 (en) | 1998-03-04 |
| WO1990010087A1 (en) | 1990-09-07 |
| CN1045128A (en) | 1990-09-05 |
| DE3906340C2 (en) | 1991-01-31 |
| BR9007161A (en) | 1992-01-28 |
| CA2009923C (en) | 1999-09-14 |
| ES2020091A6 (en) | 1991-07-16 |
| EP0462988A1 (en) | 1992-01-02 |
| ZA901414B (en) | 1990-11-28 |
| CA2009923A1 (en) | 1990-08-24 |
| KR970005200B1 (en) | 1997-04-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE4229764C2 (en) | Closed induction furnace for melting and pouring fabrics | |
| DE3815844C2 (en) | ||
| EP0462988B1 (en) | Process and device for handling metals in a vacuum | |
| EP1181491A1 (en) | Metallurgical vessel comprising a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel | |
| EP0461306B1 (en) | Induction smelting furnace | |
| DE1800959A1 (en) | Process and device for the continuous deoxidation, desulfurization and degassing of metals and alloys | |
| DE7013377U (en) | CONTINUOUS CASTING MACHINE | |
| DE1801452B1 (en) | Method and device for the production of metal powders by pressure atomizing a melt | |
| DE7928208U1 (en) | DEVICE FOR CARRYING OUT METALLURGICAL REACTIONS IN A PAN | |
| DE1960283A1 (en) | Vacuum degassing apparatus for use in continuous casting of metals and methods of continuously casting molten metal while it is being vacuum degassed | |
| JPH04503533A (en) | Method and apparatus for vacuum treating metals | |
| DE1508272B1 (en) | Device for degassing molten metal | |
| DE1912907C3 (en) | Method and device for generating movement in a metal bath, primarily for steel degassing | |
| DE3231434C1 (en) | Process and equipment for separating off slag | |
| DE2438711A1 (en) | CASTING DEVICE FOR MELT | |
| DE2835229C2 (en) | Process for continuously melting and tempering metal in a rotating melting furnace and vessel for continuously withdrawing molten metal from such a melting furnace | |
| DE3609783A1 (en) | Reactor casting ladle | |
| DE2331783C3 (en) | Immersion vessel with walls made of refractory material for introducing pure magnesium into a cast iron melt | |
| DE4405198A1 (en) | Decarburising and degassing of steel melts in converter | |
| DE2114452A1 (en) | Vacuum vessel - used in the treatment of molten metal, esp steel | |
| EP0703297B1 (en) | Container for plunging pure magnesium into a treating ladle and use of said container | |
| DE1508272C (en) | Melting device for degassing metal | |
| DE3024752C2 (en) | ||
| DE2461859C3 (en) | Apparatus for sealing vacuum chambers and method for making steel with low carbon and nitrogen content | |
| DE1935335C3 (en) | Vacuum chamber for degassing molten material, especially copper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19910730 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19921124 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 19930929 Ref country code: DK Effective date: 19930929 Ref country code: SE Effective date: 19930929 Ref country code: NL Effective date: 19930929 Ref country code: GB Effective date: 19930929 |
|
| REF | Corresponds to: |
Ref document number: 95250 Country of ref document: AT Date of ref document: 19931015 Kind code of ref document: T |
|
| ET | Fr: translation filed | ||
| REF | Corresponds to: |
Ref document number: 59002951 Country of ref document: DE Date of ref document: 19931104 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19940109 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19940112 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19940113 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19940117 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19940217 Year of fee payment: 5 |
|
| EPTA | Lu: last paid annual fee | ||
| NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DK Payment date: 19940331 Year of fee payment: 5 |
|
| GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 19930929 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Effective date: 19950228 Ref country code: LI Effective date: 19950228 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20010213 Year of fee payment: 12 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020228 |
|
| BERE | Be: lapsed |
Owner name: MANNESMANN A.G. Effective date: 20020228 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 20030205 Year of fee payment: 14 Ref country code: AT Payment date: 20030205 Year of fee payment: 14 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040220 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040220 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060214 Year of fee payment: 17 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060216 Year of fee payment: 17 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20071030 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070901 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070228 |