EP0512658B1 - Plant for treatment of liquid steel and process for running the same - Google Patents

Plant for treatment of liquid steel and process for running the same Download PDF

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Publication number
EP0512658B1
EP0512658B1 EP92250092A EP92250092A EP0512658B1 EP 0512658 B1 EP0512658 B1 EP 0512658B1 EP 92250092 A EP92250092 A EP 92250092A EP 92250092 A EP92250092 A EP 92250092A EP 0512658 B1 EP0512658 B1 EP 0512658B1
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Prior art keywords
vacuum
melt
vessels
water ring
generating
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German (de)
French (fr)
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EP0512658A1 (en
EP0512658B2 (en
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Schönewolf Dr.-Ing. Georg
Jürgen Ing. Dörpinghaus
Horst Dieter Dr.-Ing. Schöler
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Vodafone GmbH
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Mannesmann AG
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    • 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 plant for the secondary metallurgical treatment of liquid steel, which is arranged within a production chain consisting of a melting device, such as an electric furnace or converter, and a casting device, in particular a continuous casting plant.
  • a melting device such as an electric furnace or converter
  • a casting device in particular a continuous casting plant.
  • the size of the individual parts of the plant and their capacity are matched to one another in such a way that a smooth flow of material within the process chain is guaranteed for a certain generation quantity.
  • Figure 2 shows the original treatment sequence at just one vacuum level.
  • the variant 2 shown in Figure 3 provides for the final treatment of the melt in a separate rinsing station.
  • Variant 3 ( Figure 4) contains a second treatment stand.
  • a further reduction in the cycle sequence is limited by the availability of the conventional vacuum pump system, usually consisting of water ring pumps and steam jets.
  • the problem is therefore to find a solution that ensures a high degree of flexibility and adaptation of the VOD treatment time to the cycle times of the upstream and downstream melting and pouring devices with the least possible effort.
  • the invention is based on a known VOD system. This usually consists of a combination of water ring pumps and the actual core of the vacuum system, the steam jets.
  • the method for melt treatment according to the preamble of claim 6 is further developed according to the invention with regard to the aforementioned problem with the characterizing features of claim 6.
  • Fig. 6 the usual line of treatment of a melt in a VOD system, as shown in Fig. 1, is shown only in the first line, with VAK level 1 (container 1), only with the modification that the Treatment section F was moved to a conditioning stand.
  • VAK level 1 container 1
  • oxygen is blown onto the melt in the ladle 2 by the device for supplying oxygen 6 '.
  • Oxygen can also be supplied via a combustible lance.
  • the first melt is now transferred and finished in a conditioner not shown in FIG. 7.
  • the container 1 is now available for receiving a third ladle, while the container 1 'can be subjected to a deep vacuum by appropriate actuation of shut-off devices.
  • water ring pumps are always used as devices for the generation of a medium vacuum and a combination of water ring pumps and steam jets for the generation of the low vacuum, but a steam jet system of corresponding design can also be used for the medium vacuum.
  • the advantages achieved are an increase in production of the system with reduced investment and operating costs, an increased utilization of the vacuum device and an increased possibility of adapting the VOD treatments to the cycle sequence of the melting or casting devices.
  • FIG. 5 shows a timing diagram of the solution according to the invention, including an electric arc furnace or converter and a continuous casting installation, the cycle time of the vacuum installation being 55 minutes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention relates to plant for the secondary metallurgical treatment of molten steel, which is arranged within a production chain consisting of a melting device, such as an electric furnace or converter, and a casting device, in particular a continuous casting device. A solution is to be found which, at the lowest possible cost, ensures a high degree of flexibility and an adaptation of the VOD transformation time to the cycle times of the upstream and/or downstream melting and casting devices. For this purpose, the plant is designed with two stands for in each case one vessel (1, 1') which can be evacuated and contains a steel melt, which contain devices (6, 6') for feeding oxygen and devices (7, 7') for adding additives to the melt, and with pipes (3) which connect the vessels (1, 1') to a device for generating a vacuum, a device consisting of a water ring pump station (5') for generating a moderate vacuum and a device (4, 5) consisting of water ring pumps (4) and steam ejectors (5) for generating a deep vacuum being provided, and the vessels being selectively connectable only to the device for generating a moderate vacuum (5') or to the device for generating a deep vacuum (4, 5). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Anlage zur sekundärmetallurgischen Behandlung flüssigen Stahles, die innerhalb einer Erzeugungskette, bestehend aus einer Schmelzeinrichtung, wie Elektroofen oder Konverter, und einer Gießeinrichtung, insbesondere einer Stranggießanlage angeordnet ist.The invention relates to a plant for the secondary metallurgical treatment of liquid steel, which is arranged within a production chain consisting of a melting device, such as an electric furnace or converter, and a casting device, in particular a continuous casting plant.

Derartige Anlagen sind im Prinzip und hinsichtlich der technischen AusGestaltung der einzelnen Aggregate und Verfahrensstufen bekannt, z. B. aus Stahl u. Eisen 109 (1989), Nr. 22, Seite 1047 bis 1056. Die Rohstahlerzeugung wird dabei entweder in einem Elektrolichtbogenofen oder einem Konverter vorgenommen. Daran anschließend wird der flüssige Stahl einer Station zur sekundärmetallurgischen Behandlung zugeführt und fertiggemacht und letztlich auf einer Stranggießanlage bzw. als Blockstahl vergossen.Such systems are known in principle and with regard to the technical design of the individual units and process stages, for. B. made of steel u. Eisen 109 (1989), No. 22, pages 1047 to 1056. The crude steel is produced either in an electric arc furnace or in a converter. Then the liquid steel is fed to a station for secondary metallurgical treatment and finished and finally cast on a continuous caster or as block steel.

Eine derartige Prozeßkette ist auch aus einem Prospekt der Mannesmann Demag Hüttentechnik 6.15.3.11 E 08.90.2000 bekannt. Als Aggregat zur sekundärmetallurgischen Behandlung kommt hier eine VOD-Anlage zum Einsatz, s. Fig. 11 mit Beschreibung.Such a process chain is also known from a brochure from Mannesmann Demag Hüttentechnik 6.15.3.11 E 08.90.2000. A VOD system is used here as an aggregate for secondary metallurgical treatment, see 11 with description.

Die Größe der einzelnen Anlagenteile bzw. deren Kapazität ist so aufeinander abgestimmt, daß für eine bestimmte Erzeugungsmenge ein reibungsloser Materialfluß innerhalb der Prozeßkette gewährleistet ist.The size of the individual parts of the plant and their capacity are matched to one another in such a way that a smooth flow of material within the process chain is guaranteed for a certain generation quantity.

Der Verfahrensablauf innerhalb der VOD-Station wird anhand von Bild 1 erläutert. Er gliedert sich in die Abschnitte A - F:

  • A - entspricht der Zeit für die Zuführung der Pfanne zum Ort der Behandlung sowie die Vorbereitung durch Inertgasanschluß und -einstellung der Spülintensität sowie Abdeckung mittels mit Feuerfestmaterial ausgekleidetem oder wassergekühltem Deckel.
    Letzterer reduziert die Zeit bei vorliegendem Beispiel um mehr als die Hälfte.
  • B - enthält das eigentliche Vakuumfrischen. Angenommen wurden Eingangs-C-Gehalte von 0,60 % und Si-Gehalte von 0,20 % für die Stahlgüte V2A. Entsprechend einer sich ändernden Analyse sind kürzere oder längere Zeiten in Rechnung zu stellen.
  • C - beinhaltet die Auskochzeit im Anschluß an das Sauerstofffrischen.
  • D - ist die Zeit für die Aufgabe der Schlackenbildner und der Reduktionsmittel. Im Falle des zum Einsatz gelangten Deckels mit ff-Material ist dieser zu diesem Zeitpunkt zu entfernen, was im Unterschied zu dem in der Anlage installierten wassergekühlten Deckel einen zeitlichen Mehrbedarf beansprucht.
  • E - umfaßt die Reduktionszeit, deren Dauer von Erfordernissen wie Reduktion, Entgasung, Entschwefelung abhängig ist.
  • F - bezieht sich auf die Analysenkorrektur sowie die Temperaturmessung mit den Einzelaktivitäten wie Probenahme, Temperaturmessung, Legierung, Kühlschrottzugabe, Abdecken der Pfanne.
The procedure within the VOD station is explained using Figure 1. It is divided into sections A - F:
  • A - corresponds to the time for the pan to be brought to the treatment site and the preparation by means of an inert gas connection and adjustment of the purging intensity and cover by means of a lid lined with refractory material or water-cooled lid.
    The latter reduces the time in the present example by more than half.
  • B - contains the actual vacuum refresh. Inlet C contents of 0.60% and Si contents of 0.20% were assumed for the steel grade V2A. According to a changing analysis, shorter or longer times have to be charged.
  • C - includes the boil-out time following the oxygen freshening.
  • D - is the time for the abandonment of slag formers and reducing agents. If the lid with ff material is used, it must be removed at this time, which, in contrast to the water-cooled lid installed in the system, requires additional time.
  • E - includes the reduction time, the duration of which depends on requirements such as reduction, degassing, desulfurization.
  • F - refers to the analysis correction as well as the temperature measurement with the individual activities such as sampling, temperature measurement, alloy, addition of cooling scrap, covering the pan.

Im Kontext mit den vor- bzw. nachgeschalteten Produktionseinrichtungen sind dabei die in den Bildern 2 bis 4 dargestellten Varianten möglich und bekannt.In the context of the upstream or downstream production facilities, the variants shown in Figures 2 to 4 are possible and known.

Bild 2 (Variante 1) gibt die ursprüngliche Behandlungsfolge an nur einem Vakuumstand wieder. Die auf Bild 3 dargestellte Variante 2 sieht die Schlußbehandlung der Schmelze in einem gesonderten Spülstand vor.Figure 2 (variant 1) shows the original treatment sequence at just one vacuum level. The variant 2 shown in Figure 3 provides for the final treatment of the melt in a separate rinsing station.

Variante 3 (Bild 4) enthält einen zweiten Behandlungsstand. Eine weitere Reduzierung der Taktfolge ist begrenzt durch die Verfügbarkeit des herkömmlichen einen Vakuumpumpensystems, üblicherweise bestehend aus Wasserringpumpen und Dampfstrahlern.Variant 3 (Figure 4) contains a second treatment stand. A further reduction in the cycle sequence is limited by the availability of the conventional vacuum pump system, usually consisting of water ring pumps and steam jets.

Diese bekannten Konzepte der Prozeßkette Schmelzeinrichtung - VOD-Anlage - Gießeinrichtung stellen keine grundsätzlichen Lösungen dar, die niedrigen Taktzeiten von Schmelz- und Gießeinrichtungen auch nur näherungsweise zu erreichen oder eine Anpassung aneinander vorzunehmen. Veränderungen innerhalb der einmal festgelegten Linie wären nur durch Einbeziehung einer kostenaufwendigen, zusätzlichen metallurgischen Einrichtung oder der Verlagerung der Fertigmachzeit der Schmelzen nach der Reduktionsbehandlung in einen gesonderten Spülstand möglich. Auch ist das Gesamtsystem unflexibel in bezug auf Änderungen metallurgischer oder gießtechnischer Verfahrensweisen, die sich auf die Taktzeit der einzelnen Stufen im Sinne einer Verkürzung dieser Taktzeiten auswirken.These known concepts of the process chain melting device - VOD system - casting device do not represent basic solutions to even approximately achieve the low cycle times of melting and casting devices or to adapt them to one another. Changes within the line once defined would only be possible by incorporating a costly additional metallurgical facility or by shifting the preparation time of the melts to a separate rinse after the reduction treatment. The overall system is also inflexible with regard to changes in metallurgical or casting processes which affect the cycle time of the individual stages in the sense of a shortening of these cycle times.

Zum Stand der Technik wird ferner auf das Buch H. Knüppel "Desoxidation UND Vakuumbehandlung von Stahlschmelzen", Bd. 11 "Grundlagen der Pfannenmetallurgie", Verlag Stahleisen m.b.H., 1983, Düsseldorf, DE, Textteil: S.257-260, S.306-309 und Bildteil: Abbildungen 4.53 und 4.60 verwiesen.The state of the art is further referred to the book H. Knüppel "Deoxidation AND vacuum treatment of steel melts", Vol. 11 "Fundamentals of ladle metallurgy", Verlag Stahleisen mbH, 1983, Dusseldorf, DE, text part: S.257-260, S.306 -309 and picture section: Figures 4.53 and 4.60 referenced.

Das Problem besteht also darin, eine Lösung zu finden, die mit geringstmöglichem Aufwand ein hohes Maß an Flexibilität und eine Anpassung der VOD-Behandlungszeit an die Taktzeiten der vor- bzw. nachgeschalteten Schmelz- und Gleßeinrichtungen gewährleistet.The problem is therefore to find a solution that ensures a high degree of flexibility and adaptation of the VOD treatment time to the cycle times of the upstream and downstream melting and pouring devices with the least possible effort.

Die Erfindung geht von einer bekannten VOD-Anlage aus. Diese besteht im Regelfall aus einer Kombination von Wasserringpumpen und dem eigentlichen Kern der Vakuumanlage, den Dampfstrahlern.The invention is based on a known VOD system. This usually consists of a combination of water ring pumps and the actual core of the vacuum system, the steam jets.

Hinsichtlich des Anlagenteils gemäß Gattungsbegriff des Anspruches 1 wird das Problem gelöst durch die kennzeichnenden Merkmale des Anspruches 1. Erfindungsgemäße Weiterentwicklungen enthalten die Unteransprüche 2 bis 5.With regard to the plant part according to the preamble of claim 1, the problem is solved by the characterizing features of claim 1. Further developments according to the invention contain the Subclaims 2 to 5.

Das Verfahren zur Schmelzenbehandlung gemäß Gattungsbegriff des Anspruches 6 wird hinsichtlich des vorgenannten Problems erfindungsgemäß weiterentwickelt mit den kennzeichnenden Merkmalen des Anspruches 6.The method for melt treatment according to the preamble of claim 6 is further developed according to the invention with regard to the aforementioned problem with the characterizing features of claim 6.

Nachfolgend soll die Erfindung näher erläutert werden, wobei Bezug genommen wird auf die Fig. 6 und 7.The invention will be explained in more detail below, reference being made to FIGS. 6 and 7.

In Fig. 6 ist zunächst in der ersten Zeile, mit VAK-Stand 1 (Behälter 1) bezeichnet, der übliche Behandlungsablauf einer Schmelze in einer VOD-Anlage dargestellt, wie er sich aus Fig. 1 ergibt, lediglich mit der Abwandlung, daß der Behandlungsabschnitt F in einen Konditionierungsstand verlegt wurde.In Fig. 6, the usual line of treatment of a melt in a VOD system, as shown in Fig. 1, is shown only in the first line, with VAK level 1 (container 1), only with the modification that the Treatment section F was moved to a conditioning stand.

Nach Abschluß aller vorbereitenden Arbeiten (Zeitabschnitt A) wird im Behälter 1 gemäß Fig. 7 durch Einschalten der Wasserringpumpen 5' bei geschlossener Absperrvorrichtung 9, 9', 12 über die Saugleitung 10, 11' bei geöffneter Absperrvorrichtung 12' ein mittleres Vakuum von z.B. 180 mbar erzeugt. In diesem Zeitabschnitt B wird auf die Schmelze in der Gießpfanne 2 durch die Einrichtung zur Sauerstoffzufuhr 6' Sauerstoff auf die Schmelze aufgeblasen. Die Sauerstoffzufuhr kann auch über eine abbrennbare Lanze erfolgen.After all preparatory work has been completed (time period A), a medium vacuum of, for example, a vacuum of e.g. 180 mbar generated. In this period B, oxygen is blown onto the melt in the ladle 2 by the device for supplying oxygen 6 '. Oxygen can also be supplied via a combustible lance.

Gegen Ende dieses Abschnittes B, bei geringer werdendem Gasanfall aus der Schmelze, wird die Absperrvorrichtung 9' geöffnet und dafür die Absperrvorrichtung 12' geschlossen, so daß nunmehr der Behälter 1 von den Wasserringpumpen 5 und den Dampfstrahlern 4 auf ein gewünschtes Tiefvakuum bestimmter Größe gefahren wird. Während dieser Zeit kann weiterhin Sauerstoff geblasen werden. Nach Beendigung der Sauerstoffzufuhr schließen sich die Behandlungsschritte bzw. Behandlungsabschnitte C - Auskochen - und E = Reduzieren - (unter Einleiten von Spülgasen) an.Towards the end of this section B, when the amount of gas from the melt becomes less, the shut-off device 9 'is opened and the shut-off device 12' is closed, so that the container 1 is now driven by the water ring pumps 5 and the steam jets 4 to a desired low vacuum of a certain size . Oxygen can still be blown during this time. After the oxygen supply has ended, the treatment steps or treatment sections C - boil-out - and E = reduce - (with the introduction of purge gases) follow.

Während dieser Behandlung im Behälter 1 wird in den VAK-Stand 2 (Behälter 1') eine weitere Pfanne 2 eingesetzt und es erfolgt eine Behandlung nach der für die erste Pfanne beschriebenen Art, d. h. es wird die Absperrvorrichtung 12 geöffnet, so daß im Behälter 1' ein mittleres Vakuum mit Hilfe der Wasserringpumpen 5' über die Rohrleitungen 10, 11 erzeugt wird.During this treatment in container 1, another pan 2 is inserted into VAK stand 2 (container 1 ') and a treatment is carried out in the manner described for the first pan, i.e. H. the shut-off device 12 is opened so that a medium vacuum is generated in the container 1 'by means of the water ring pumps 5' via the pipes 10, 11.

Mit Abschluß der Behandlungszelt E für die erste Pfanne im Behälter 1 ist gleichzeitig die Vorbehandlung der Schmelze im Behälter 1' abgeschlossen.At the end of the treatment tent E for the first pan in the container 1, the pretreatment of the melt in the container 1 'is completed at the same time.

Bei dem gewählten Beispiel wird nun die erste Schmelze in einem in Fig. 7 nicht dargestellten Konditionsierungsstand überführt und fertiggemacht. Der Behälter 1 steht jetzt für die Aufnahme einer dritten Gießpfanne zur Verfügung, während der Behälter 1' durch entsprechende Betätigung von Absperrvorrichtungen einem Tiefvakuum unterworfen werden kann.In the example chosen, the first melt is now transferred and finished in a conditioner not shown in FIG. 7. The container 1 is now available for receiving a third ladle, while the container 1 'can be subjected to a deep vacuum by appropriate actuation of shut-off devices.

In dem vorliegenden Beispiel werden zwar stets als Einrichtungen für die Erzeugung eines mittleren Vakuums Wasserringpumpen benutzt und für die Erzeugung des Tiefvakuums eine Kombination von Wasserringpumpen und Dampfstrahlern, jedoch kann auch für das mittlere Vakuum eine Dampfstrahlanlage entsprechender Auslegung benutzt werden.In the present example, water ring pumps are always used as devices for the generation of a medium vacuum and a combination of water ring pumps and steam jets for the generation of the low vacuum, but a steam jet system of corresponding design can also be used for the medium vacuum.

Mit der erfindungsgemäßen Lösung wird der Zweck verfolgt, eine höhere zeitliche Auslastung der vor-und nachgeschalteten Schmelz- und Gießeinrichtungen durch z. B. Sequenzguß beim Stranggießen bei höherer Schmelzleistung oder verringerter Größe der Öfen zu erreichen.With the solution according to the invention the purpose is pursued, a higher time utilization of the upstream and downstream melting and pouring devices by z. B. Sequence casting in continuous casting with higher melting capacity or reduced size of the furnaces.

Die erzielten Vorteile stellen sich dar als Produktionssteigerung der Anlage bei verringerten Investitions-und Betriebskosten, einer erhöhten Auslastung der Vakuumeinrichtung und erhöhte Anpassungsmöglichkeit der VOD-Behandlungen an die Taktfolge der Schmelz- bzw. Gießeinrichtungen.The advantages achieved are an increase in production of the system with reduced investment and operating costs, an increased utilization of the vacuum device and an increased possibility of adapting the VOD treatments to the cycle sequence of the melting or casting devices.

In Fig. 5 ist ein Zeitablaufsschema der erfindungsgemäßen Lösung unter Einbeziehung eines Elektrolichtbogenofens bzw. Konverters und einer Stranggießanlage dargestellt, wobei die Taktzeit der Vakuumanlage 55 min beträgt.5 shows a timing diagram of the solution according to the invention, including an electric arc furnace or converter and a continuous casting installation, the cycle time of the vacuum installation being 55 minutes.

Die durch die erfindungsgemäße Lösung möglichen Effekte sind der nachfolgenden Übersicht zu entnehmen mit ihren Auswirkungen auf Behandlungszeit, Produktivität bzw. Anlagengröße.

Figure imgb0001
The effects possible with the solution according to the invention can be seen in the following overview with their effects on treatment time, productivity and plant size.
Figure imgb0001

Dabei ist zu ergänzen, daß - gleiche Taktzeit vorausgesetzt - diese Effekte auch bei den vor- und nachgeschalteten Schmelz- und Gießeinrichtungen eintreten. Beispielsweise könnte im Vergleich mit Var. 3 (Fig. 4) bei der erfindungsgemäßen Lösung - gleiche Produktionshöhe vorausgesetzt - die Anlagengröße von 100 auf 54 t reduziert werden, dies sowohl im Hinblick auf Schmelzeinrichtung, Vakuum- und Stranggießanlage.It should be added that - provided the cycle time is the same - these effects also occur in the upstream and downstream melting and casting equipment. For example, in comparison with Var. 3 (FIG. 4) in the solution according to the invention - assuming the same production level - the plant size can be reduced from 100 to 54 t, both with regard to the melting device, vacuum and continuous casting plant.

Claims (6)

1. An installation for the secondary-metallurgical treatment of molten steel within a production chain consisting of a melting apparatus and a pouring apparatus, in particular a continuous-casting installation, with two stands for one evacuatable vessel (1, 1') containing a steel melt in each case, which have means (6, 6') for supplying oxygen and means (7, 7') for adding additives to the melt and pipes (3) which connect the vessels to an apparatus with water ring pumps and steam ejectors for producing a vacuum,
characterised by
an apparatus, consisting of a water ring pumping station (5') for producing a medium vacuum and an apparatus (4, 5), consisting of water ring pumps (4) and steam ejectors (5) for producing a deep vacuum, the vessels (1, 1') being able to be connected selectively to only one or the other apparatus (5' or 4, 5).
2. An installation according to Claim 1,
characterised in that the vessels (1, 1') are designed to receive pouring ladles (2).
3. An installation according to Claim 1,
characterised in that the vessels (1, 1') are formed by pouring ladles (2) with vacuum-tight covers which can be placed thereon.
4. An installation according to one of Claims 1 to 3,
characterised in that the vessels (1, 1') have means (8, 8') for introducing gases into the melt.
5. An installation according to one of Claims 1 to 4,
characterised in that the vessels (1, 1') are connected to a branch pipe (3') of the pipe (3) which leads to the apparatus (4, 5) for producing the vacuum, and blocking mechanisms (9, 9') are located between the branch-off point (3") and the vessels (1, 1'), and a suction line (10) coming from the water ring pumps (5') is connected via its branches (11, 11') via blocking mechanisms (12, 12') to the pipe (3') in a region between the containers (1, 1') and the respective blocking mechanisms (9, 9').
6. A method for the secondary-metallurgical treatment of molten steel under vacuum, in particular using an installation according to Claims 1 to 5, comprising the process steps
1. refining the melt with simultaneous supply of oxygen,
2. boiling of the melt following the supply of oxygen,
3. addition of reducing agents with subsequent treatment time for degasification and desulphurisation of the melt and
4. analysis correction and alloying,
in which at least one process step is effected with the simultaneous introduction of an additional gas, in particular of inert gases, into the melt and two melts are simultaneously subjected to the vacuum, characterised in that
the melts are subjected to the vacuum at staggered times such that in each case one of the melts is treated under a medium vacuum and during this time the other melt - which has previously been subjected to the medium vacuum - is treated in the same vessel under a deep vacuum, the medium vacuum being operated in a range of 1 bar to 200 mbar and the deep vacuum being operated below this value.
EP92250092A 1991-05-02 1992-04-23 Plant for treatment of liquid steel and process for running the same Expired - Lifetime EP0512658B2 (en)

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DE4114613 1991-05-02
DE4114613A DE4114613A1 (en) 1991-05-02 1991-05-02 PLANT FOR TREATING LIQUID STEEL AND METHOD FOR OPERATING SUCH A PLANT

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EP0512658A1 EP0512658A1 (en) 1992-11-11
EP0512658B1 true EP0512658B1 (en) 1995-03-01
EP0512658B2 EP0512658B2 (en) 1998-07-01

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AT (1) ATE119210T1 (en)
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ES (1) ES2068672T3 (en)

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CN103305662A (en) * 2013-05-31 2013-09-18 中冶南方工程技术有限公司 Vacuum system for vacuum melting
CN110295269B (en) * 2019-06-21 2021-11-26 敬业钢铁有限公司 Vacuumizing method using vacuumizing device of refining furnace

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US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
DE2043861A1 (en) * 1970-09-04 1972-03-09 Rheinstahl AG Anlagentechnik, 4300 Essen Steel makin g - pre-heated scrap iron in electric furnaces and staged refining

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DE4114613C2 (en) 1993-07-08
US5242484A (en) 1993-09-07
DE4114613A1 (en) 1992-11-05
ATE119210T1 (en) 1995-03-15
JP3387522B2 (en) 2003-03-17
EP0512658A1 (en) 1992-11-11
EP0512658B2 (en) 1998-07-01
DE59201502D1 (en) 1995-04-06
ES2068672T3 (en) 1995-04-16
JPH05148528A (en) 1993-06-15

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