EP0861337B1 - Method for decarburizing steels melts - Google Patents

Method for decarburizing steels melts Download PDF

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Publication number
EP0861337B1
EP0861337B1 EP96938974A EP96938974A EP0861337B1 EP 0861337 B1 EP0861337 B1 EP 0861337B1 EP 96938974 A EP96938974 A EP 96938974A EP 96938974 A EP96938974 A EP 96938974A EP 0861337 B1 EP0861337 B1 EP 0861337B1
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EP
European Patent Office
Prior art keywords
oxygen
vessel
decarburisation
fuel
decarburization
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.)
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EP96938974A
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German (de)
French (fr)
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EP0861337A1 (en
Inventor
Horst-Dieter Dr. SCHÖLER
Volker Dr.-Ing. Wiegmann
Rainer Dipl.-Ing. Dittrich
Frank Dr.-Ing. Haers
Leo Peeters
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SMS Siemag AG
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SMS Demag 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • F27D2003/169—Construction of the lance, e.g. lances for injecting particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0075—Regulation of the charge quantity

Definitions

  • the invention relates to a process for the decarburization of molten steel in a closed metallurgical vessel connected to a vacuum system and into the Oxygen can be introduced via a lance and combustible materials via a feed device are.
  • EP 0 110 809 describes a method for Treatment of steel in the pan by means of reactive slags is known in which one metallothermal reaction is provided, with the help of a lance oxygen in a the melt immersed bell is blown in, flammable metallic substances underneath Formation of reactive slags react and below the pipe in which the steel treatment takes place, a neutral or reducing purge gas is injected.
  • EP 0 347 884 B1 discloses a process for degassing and decarburizing molten steel, in which steel has led from a container into a vacuum chamber and an oxygen lance is arranged in the vacuum chamber at a given distance, from which oxygen or oxygen-containing gas is used Combustion of the CO is inflated near the surface of the molten steel in the vacuum chamber. Taking into account a predetermined ratio of (CO + CO 2 ) / exhaust gas amount or CO / (CO + CO 2 ), oxygen or an oxygen-containing gas is supplied through a CO combustion lance near the surface of the molten steel located in the vacuum chamber .
  • This process does not show the melt at certain pressure conditions heat up chemically and inflate with a defined excess amount of oxygen.
  • the aim of the invention is to provide a method for decarburizing a molten steel create the decarburization time while realizing a high degree of oxide purity shortened and / or the final carbon content is reduced.
  • this is carried out in addition to that during the decarburization phase of the supplementary oxygen used in the carbon degradation, further oxygen is blown in and at the same time added metallic fuel.
  • the chemical heating agent for example in the form of aluminum powder, can be used in a special way to accelerate decarburization.
  • the reaction kinetics are influenced by the Al 2 O 3 particles formed during heating. These deoxidation products act as foreign germs and can therefore force the decarburization rate, especially through the formation of CO bubbles.
  • a combination lance is used in which the oxygen and the metallic fuels are promoted.
  • these through a separate tube Feed the vessel.
  • any partial temperature increase during a Decarburization can be realized under vacuum.
  • This has the advantage of being typical Temperature losses such as due to insufficiently preheated treatment vessels or steel pans and due to delays due to transportation or extended To compensate for treatment times.
  • FIG. 1 shows a vacuum vessel 43 provided with a lid 44, which has a Suction line 42 is connected to a vacuum system 41.
  • a vacuum vessel there is a metallurgical vessel 10 which has a jacket 12 which with a refractory lining 13 is provided inside.
  • the vessel is with melt S filled.
  • a measuring lance 28 and a combination lance 31 protrude through the cover 44.
  • the combination lance 31 has a feed line 32 for oxygen and a feed line 33 for metallic fabrics.
  • a barrier 34 and on the Supply line 33 is provided with a shut-off 35.
  • the barriers 34 and 35 have Control units 23, 25 on the control lines 24, 26 with a measuring and Control device 22 are connected.
  • This measuring and control device 22 is a Measuring line 27 with a measuring element 21 provided on the measuring lance 28 for Measurement of the temperature T and a measuring element 29 for measuring the in the vessel space prevailing pressure P.
  • FIG Melt An open metallurgical vessel 10 is used in FIG Melt is filled, with a tube feed 46 and a in the melt Immerse the pipe outlet 47 of an RH vessel 45.
  • the RH vessel is over one Suction line 42 connected to a vacuum system 41.
  • Combination lance 31 protrudes into the RH vessel for the supply of particularly coarse Solids into a pipe 38 which is closed by a shut-off 37 with a container 36 in Connection is established.
  • the measuring and regulating and the control device is as in the Figure 1 trained.
  • FIG. 3 shows a vessel 10 which is closed by a lid 15, the one Bell 14 has the mouth side into the melt S located in the vessel 10 immersed.
  • the Sautechnisch 42 connected to the vacuum 41 is designed so that a lockable branch is provided, once to the bell 14 with the Barrier 48 and to cover 15 with barrier 49.
  • the measuring and regulating device as well as the control device are as in the Figures 1 or 2 designed.
  • the temperature measuring element 21 is through the metallic jacket 12 of the vessel 10 led deep into the refractory lining 13.

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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)
  • Coating With Molten Metal (AREA)

Abstract

The invention relates to a process for decarburizing a steel melt in a closed metallurgical vessel that is connected to a vacuum unit which includes reducing pressure in the vessel to below 100 mbar, introducing replenishment oxygen to implement the removal of carbon, introducing a predetermined additional amount of oxygen, and introducing a combustible metallic substance with the additional amount of oxygen. The invention also relates to an apparatus for performing the above process including the closable vessel, measurement elements for determining melt temperature and pressure, and a controller for controlling the amount of additional oxygen and combustible metallic substance in response to the melt temperature and pressure.

Description

Die Erfindung betrifft ein Verfahren zur Entkohlung von Stahlschmelzen in einem geschlossenen metallurgischen Gefäß, das an eine Vakuumanlage angeschlossen ist und in das über eine Lanze Sauerstoff sowie über eine Zufuhreinrichtung brennbare Stoffe einführbar sind.The invention relates to a process for the decarburization of molten steel in a closed metallurgical vessel connected to a vacuum system and into the Oxygen can be introduced via a lance and combustible materials via a feed device are.

Ein derartiges Verfahren ist aus dem "Patent Abstract of Japan, vol 002, no117 (C-023),29.09.78, & Derwent Abstract 78-61015A & JP-A-53081418" und aus der FR-A-2130350 bekannt.Such a method is known from the "Patent Abstract of Japan, vol 002, no117 (C-023), 29.09.78, & Derwent Abstract 78-61015A & JP-A-53081418 "and known from FR-A-2130350.

Bei der sogenannten Forced Decarburizadion ist es bekannt, Sauerstoff während der Entkohlungsphase zuzusetzen. Dieser Sauerstoffzusatz ist immer dann erforderlich, wenn der im Stahl vorhandene Sauerstoff zur Entkohlung nicht ausreicht, bzw. so niedrig ist, daß der erforderliche C-Abbau nicht in der zur Verfügung stehenden Zeit abgeschlossen ist. Bei einem solchen Verfahren werden beispielsweise Tauchrohre eines RH-Gefäßes in die Schmelze eingetaucht. Mit Start des Druckabbaus im RH-Gefäß startet der Entkohlungsprozeß gleichzeitig in Abhängigkeit mit der Druckabsenkung. Bei einem erreichten Unterdruck von p < 100 mbar wird die Sauerstofflanze gestartet und O2 etwa 1 bis 3 min. geblasen. Während der Tiefvakuumphase findet die Selbstentkohlung statt, die Entkohlung wird beendet. nach der Desoxidation.With the so-called forced decarburizadione, it is known to add oxygen during the decarburization phase. This addition of oxygen is always necessary when the oxygen in the steel is not sufficient for decarburization or is so low that the required C-degradation is not completed in the time available. In such a method, for example, dip tubes of an RH vessel are immersed in the melt. With the start of pressure reduction in the RH vessel, the decarburization process starts at the same time as the pressure drops. When a vacuum of p <100 mbar is reached, the oxygen lance is started and O 2 for about 1 to 3 minutes. blown. Self-decarburization takes place during the low vacuum phase and decarburization is ended. after deoxidation.

Während der Entkohlung werden bis zu 70 % CO gebildet. Ein Teil dieses Gases reagiert automatisch mit Teilen des zugesetzten Sauerstoffs zu CO2. Der Nachverbrennungsgrad ist bei dieser Fahrweise kleiner 30 %. Up to 70% CO is formed during decarburization. Part of this gas reacts automatically with parts of the added oxygen to CO 2 . The degree of afterburning is less than 30% with this driving style.

Weiterhin ist es hüttenmännische Praxis, zum chemischen Aufheizen von Stahlschmelzen in atmosphärischen Anlagen Aluminium einzusetzen. Bei diesem chemischen Heizen wird der Energiegewinn, der aus der Verbrennung des Aluminiums mit dem zugesetzten Sauerstoff resultiert, zum Aufheizen der Schmelze ausgenutzt.Furthermore, it is metallurgical practice for the chemical heating of molten steel in atmospheric systems use aluminum. With this chemical heating the Energy gain from the combustion of the aluminum with the added oxygen results, used to heat the melt.

Neben dem reinen thermischen Heizen mit Aluminium kann dieses mit anderen Stoffen zur Behandlung der Schmelze eingesetzt werden. So ist aus EP 0 110 809 ein Verfahren zur Behandlung von Stahl in der Pfanne mittels reaktiven Schlacken bekannt, bei der eine metallothermische Reaktion vorgesehen ist, wobei mit Hilfe einer Lanze Sauerstoff in ein in die Schmelze eingetauchte Glocke eingeblasen wird, brennbare metallische Stoffe unter Bildung reaktiver Schlacken reagieren und unterhalb des Rohres, in welchem die Stahlbehandlung stattfindet, ein neutrales oder reduzierendes Spülgas eingeblasen wird.In addition to pure thermal heating with aluminum, this can be done with other materials Treatment of the melt can be used. EP 0 110 809 describes a method for Treatment of steel in the pan by means of reactive slags is known in which one metallothermal reaction is provided, with the help of a lance oxygen in a the melt immersed bell is blown in, flammable metallic substances underneath Formation of reactive slags react and below the pipe in which the steel treatment takes place, a neutral or reducing purge gas is injected.

Nachteil dieses Verfahrens zur Entschweflung-, Desoxidation- und Reinigungsreaktion von Stahlschmelzen ist die Bildung der reaktiven Schlacken, die in der in das flüssige Metall eingetauchte Glocke stattfinden sollen.Disadvantage of this method for the desulfurization, deoxidation and purification reaction of Steel melting is the formation of the reactive slags that are immersed in the liquid metal Bell should take place.

Weiterhin ist aus der EP 0 347 884 B1 ein Verfahren zum Entgasen und Entkohlen von erschmolzenem Stahl bekannt, bei dem Stahl aus einem Behälter in eine Vakuumkammer geführt hat und in der Vakuumkammer im gegebenen Abstand eine Sauerstofflanze angeordnet ist, aus der Sauerstoff oder sauerstoffhaltiges Gas zur Verbrennung des CO in der Nähe der Oberfläche des in der Vakuumkammer befindlichen erschmolzenen Stahls aufgeblasen wird. Unter Berücksichtigung eines vorgegebenen Verhältnisses von (CO + CO2)/Abgasmenge bzw. CO/(CO + CO2) wird Sauerstoff oder ein sauerstoffhaltiges Gas durch eine Lanze zur Verbrennung von CO in der Nähe der Oberfläche des in der Vakuumkammer befindlichen erschmolzenen Stahls zugeführt.Furthermore, EP 0 347 884 B1 discloses a process for degassing and decarburizing molten steel, in which steel has led from a container into a vacuum chamber and an oxygen lance is arranged in the vacuum chamber at a given distance, from which oxygen or oxygen-containing gas is used Combustion of the CO is inflated near the surface of the molten steel in the vacuum chamber. Taking into account a predetermined ratio of (CO + CO 2 ) / exhaust gas amount or CO / (CO + CO 2 ), oxygen or an oxygen-containing gas is supplied through a CO combustion lance near the surface of the molten steel located in the vacuum chamber .

Diesem Verfahren ist nicht zu entnehmen, die Schmelze bei bestimmten Druckverhältnissen chemisch aufzuheizen und mit einer definierten Überschußmenge an Sauerstoff aufzublasen.This process does not show the melt at certain pressure conditions heat up chemically and inflate with a defined excess amount of oxygen.

Die Erfindung hat sich das Ziel gesetzt, ein Verfahren zur Entkohlung einer Stahlschmelze zu schaffen, bei dem unter Realisierung eines hohen oxidischen Reinheitsgrades die Entkohlungszeit verkürzt und/oder der Endkohlenstoffgehalt vermindert wird. The aim of the invention is to provide a method for decarburizing a molten steel create the decarburization time while realizing a high degree of oxide purity shortened and / or the final carbon content is reduced.

Die Erfindung erreicht dieses Ziel mit den Merkmalen des Patentanspruchs 1.The invention achieves this aim with the features of patent claim 1.

Erfindungsgemäß wird zusätzlich zu dem während der Entkohlungsphase zur Durchführung des Kohlenstoffabbaus eingesetzten Ergänzungssauerstoffs weiterer Sauerstoff eingeblasen und gleichzeitig metallischer Brennstoff verteilt zugegeben.According to the invention, this is carried out in addition to that during the decarburization phase of the supplementary oxygen used in the carbon degradation, further oxygen is blown in and at the same time added metallic fuel.

In bekannten Vakuumanlagen wurden bisher ausschließlich beruhigt vergossene (Al, Si oder Al-Si-Desoxidation) Schmelzen bzw. unberuhigt vergossene Schmelzen (Entkohlungsschmelzen) nach erfolgter Entkohlung und anschließender Desoxidation chemisch aufgeheizt. Die Begründung war die Erniedrigung des zur Entkohlung erforderlichen Sauerstoffs beim Zusatz des Heiz-Aluminiums. Ausgenutzt wird der Energiegewinn, der bei der Reaktion aus der Verbrennung des Aluminiums mit dem zugesetzten Sauerstoff resultiert. Bei diesem Verfahren wurde aber die Entkohlungsreaktion stark gebremst und der zu erwartende Entkohlungssauerstoff wurde nicht erreicht.In known vacuum systems, cast (Al, Si or Al-Si deoxidation) Melting or poured-out casts (decarburization melts) chemically heated after decarburization and subsequent deoxidation. The reason was the lowering of the oxygen required for decarburization Addition of the heating aluminum. The energy gained from the reaction is used combustion of the aluminum with the added oxygen results. With this procedure However, the decarburization reaction was slowed down considerably and the expected decarburization oxygen was not reached.

Erfindungsgemäß wird dieser Nachteil umgangen und der während der Entkohlung eintretende Temperaturverlust durch den Heizvorgang mit Aluminium oder ähnlichen Produkten wird kompensiert. Bei dem vorgeschlagenen Sauerstoffzusatz kommt es zu einem zeitlich begrenzten partiellen Sauerstoffüberschuß in der Schmelze. Partieller Sauerstoffüberschuß ist der zusätzliche Sauerstoff, der während der Entkohlung unberuhigt vergossenen Schmelzen in Vakuumanlagen zum Verbrennen metallischer Brennstoffe bzw. Brennstoffgemische zusätzlich benötigt, ohne den Entkohlungsprozeß nachteilig zu beeinflußen. Dieser Überschuß zeigt positive thermodynamische und kinetische Effekte und fördert in überraschender Weise den Entkohlungsprozeß. Bei der Entkohlungsreaktion [C] + [O] = (CO), die nicht nur stark druckabhängig sondern auch im besonderen Maße temperaturabhängig ist, wird dadurch beschleunigt, daß die beim chemischen Heizen kurzzeitig anstehende starke Überhitzung einer Teilschmelze insbesondere im RH-Gefäß sich katalytisch auf die Entkohlungsreaktion auswirkt.According to the invention, this disadvantage is avoided and that which occurs during the decarburization Temperature loss due to the heating process with aluminum or similar products is compensated. With the proposed addition of oxygen there is a temporal limited partial excess of oxygen in the melt. There is a partial excess of oxygen the additional oxygen that melts during the decarburization in vacuum systems for burning metallic fuels or fuel mixtures additionally needed without adversely affecting the decarburization process. That surplus shows positive thermodynamic and kinetic effects and surprisingly promotes the decarburization process. In the decarburization reaction [C] + [O] = (CO), which is not only strong is pressure-dependent but also temperature-dependent to a particular extent accelerates that the strong pending for a short time during chemical heating Overheating of a partial melt, especially in the RH vessel, catalytically affects the Decarburization reaction affects.

Weiterhin kann in besonderer Weise das chemische Aufheizmittel, beispielsweise in Form von Aluminiumgrieß für die Beschleunigung der Entkohlung benutzt werden. Neben dem thermodynamischen Effekt wird nämlich die Reaktionskinetik durch die beim Heizen gebildeten Al2O3-Partikel beeinflußt. Diese Desoxidationsprodukte wirken als Fremdkeime und können somit forcierend auf die Entkohlungsgeschwindigkeit, insbesondere durch die Bildung von CO-Blasen, wirken.Furthermore, the chemical heating agent, for example in the form of aluminum powder, can be used in a special way to accelerate decarburization. In addition to the thermodynamic effect, the reaction kinetics are influenced by the Al 2 O 3 particles formed during heating. These deoxidation products act as foreign germs and can therefore force the decarburization rate, especially through the formation of CO bubbles.

In einer vorteilhaften Ausgestaltung wird eine Kombinationslanze eingesetzt, bei der der Sauerstoff und die metallischen Brennstoffe gefördert werden. Bei besonders grobkörnigen Stoffen wird vorgeschlagen, diese durch ein gesondertes Rohr dem Gefäß zuzuführen.In an advantageous embodiment, a combination lance is used in which the oxygen and the metallic fuels are promoted. With especially Coarse-grained substances are suggested, these through a separate tube Feed the vessel.

Mit diesem Verfahren kann jede partielle Temperatur-Zunahme während einer Entkohlung unter Vakuum realisiert werden. Dies hat den Vorteil, typische Temperaturverluste wie z.B. durch ungenügend vorgewärmte Behandlungsgefäße bzw. Stahlpfannen und durch Verzögerungen infolge Transport- oder verlängerte Behandlungszeiten zu kompensieren.With this method, any partial temperature increase during a Decarburization can be realized under vacuum. This has the advantage of being typical Temperature losses such as due to insufficiently preheated treatment vessels or steel pans and due to delays due to transportation or extended To compensate for treatment times.

Mit gezieltem chemischen Aufheizen der Entkohlungsschmelzen während der Entkohlungsphase können die Konverter- oder UHP-Abstichtemperaturen gesenkt werden. Dies führt:

  • bei Konvertern zu
    • höheren Konverterhaltbarkeiten
    • hohe Variabilität im festen Schrotteinsatz
    • kürzeren Tap to tap-Zeiten
  • bei Elektro-Lichtbogenöfen zu
    • kürzeren Tap to tap-Zeiten
    • geringerer spezifischer Elektroden-Verbrauch
    • geringerem spezifischen Energieverbrauch
With targeted chemical heating of the decarburization melt during the decarburization phase, the converter or UHP tapping temperatures can be reduced. This leads to:
  • with converters too
    • higher converter durability
    • high variability in fixed scrap use
    • shorter tap to tap times
  • with electric arc furnaces
    • shorter tap to tap times
    • lower specific electrode consumption
    • lower specific energy consumption

Das vorgeschlagene Verfahren läßt sich bei verschiedensten Gefäßformen anwenden, wie im folgenden Beispiel der beiliegenden Zeichnung dargelegt. Dabei zeigen:

Figur 1
Die Behandlung in einem Vakuumgefäß.
Figur 2
Die Behandlung in einem RH-Gefäß.
Figur 3
Die Behandlung in einer geschlossenen Pfanne.
The proposed method can be used in a wide variety of vessel shapes, as shown in the following example of the accompanying drawing. Show:
Figure 1
Treatment in a vacuum vessel.
Figure 2
Treatment in an RH vessel.
Figure 3
Treatment in a closed pan.

Die Figur 1 zeigt ein mit einem Deckel 44 versehenes Vakuumgefäß 43, das über eine Saugleitung 42 an eine Vakuumanlage 41 angeschossen ist. Im Vakuumgefäß befindet sich ein metallurgisches Gefäß 10, das einen Mantel 12 aufweist, der mit einer Feuerfestauskleidung 13 innen versehen ist. Das Gefäß ist mit Schmelze S gefüllt.FIG. 1 shows a vacuum vessel 43 provided with a lid 44, which has a Suction line 42 is connected to a vacuum system 41. In a vacuum vessel there is a metallurgical vessel 10 which has a jacket 12 which with a refractory lining 13 is provided inside. The vessel is with melt S filled.

Durch den Deckel 44 ragen eine Meßlanze 28 und eine Kombinationslanze 31.A measuring lance 28 and a combination lance 31 protrude through the cover 44.

Die Kombinationslanze 31 weist eine Zuleitung 32 für Sauerstoff und eine Zuleitung 33 für metallische Stoffe auf. An der Zuleitung 32 ist eine Absperrung 34 und an der Zuleitung 33 eine Absperrung 35 vorgesehen. Die Absperrungen 34 und 35 weisen Steuerorgane 23, 25 auf, die über Steuerleitungen 24, 26 mit einem Meß- und Regelgerät 22 verbunden sind. Dieses Meß- und Regelgerät 22 ist über eine Meßleitung 27 mit einem an der Meßlanze 28 vorgesehenen Meßelement 21 zur Messung der Temperatur T und ein Meßelement 29 zur Messung des im Gefäßraum herrschenden Druckes P verbunden.The combination lance 31 has a feed line 32 for oxygen and a feed line 33 for metallic fabrics. On the feed line 32 is a barrier 34 and on the Supply line 33 is provided with a shut-off 35. The barriers 34 and 35 have Control units 23, 25 on the control lines 24, 26 with a measuring and Control device 22 are connected. This measuring and control device 22 is a Measuring line 27 with a measuring element 21 provided on the measuring lance 28 for Measurement of the temperature T and a measuring element 29 for measuring the in the vessel space prevailing pressure P.

Bei der Figur 2 wird ein offenes metallurgisches Gefäß 10 eingesetzt, das mit Schmelze gefüllt ist, wobei in die Schmelze eine Rohrzuführung 46 und eine Rohrabführung 47 eines RH-Gefäßes 45 eintauchen. Das RH-Gefäß ist über eine Saugleitung 42 mit einer Vakuumanlage 41 verbunden. Zusätzlich zu einer Kombinationslanze 31 ragt in das RH-Gefäß zur Zuführung von insbesondere groben Feststoffen ein Rohr 38 hinein, das durch eine Absperrung 37 mit einem Behälter 36 in Verbindung steht. Die Meß- und Regel- sowie die Steuereinrichtung ist wie in der Figur 1 ausgebildet. An open metallurgical vessel 10 is used in FIG Melt is filled, with a tube feed 46 and a in the melt Immerse the pipe outlet 47 of an RH vessel 45. The RH vessel is over one Suction line 42 connected to a vacuum system 41. In addition to one Combination lance 31 protrudes into the RH vessel for the supply of particularly coarse Solids into a pipe 38 which is closed by a shut-off 37 with a container 36 in Connection is established. The measuring and regulating and the control device is as in the Figure 1 trained.

Die Figur 3 zeigt ein Gefäß 10, das durch einen Deckel 15 verschlossen ist, der eine Glocke 14 aufweist, die mündungsseitig in die im Gefäß 10 befindliche Schmelze S eintaucht.FIG. 3 shows a vessel 10 which is closed by a lid 15, the one Bell 14 has the mouth side into the melt S located in the vessel 10 immersed.

Die mit der Vakuum 41 verbundene Sauleitung 42 ist so ausgestaltet, daß eine absperrbare Verzweigung vorgesehen ist, und zwar einmal zur Glocke 14 mit der Absperrung 48 und zum Deckel 15 mit der Absperrung 49.The Sauleitung 42 connected to the vacuum 41 is designed so that a lockable branch is provided, once to the bell 14 with the Barrier 48 and to cover 15 with barrier 49.

Die Meß- und Regeleinrichtung wie auch die Steuereinrichtung sind wie in den Figuren 1 oder 2 ausgestaltet. Zur Druckmessung sind die Elemente 29 im Innenraum 17 der Glocke 14 sowie im Innenraum 11 des Gefäßes, hier der Pfanne 10, vorgesehen.The measuring and regulating device as well as the control device are as in the Figures 1 or 2 designed. The elements 29 in the Interior 17 of the bell 14 and in the interior 11 of the vessel, here the pan 10, intended.

Das Temperatur-Meßelement 21 ist durch den metallischen Mantel 12 des Gefäßes 10 bis tief in die Feuerfestauskleidung 13 geführt. The temperature measuring element 21 is through the metallic jacket 12 of the vessel 10 led deep into the refractory lining 13.

PositionslistePosition list

1010th
Metallurgisches GefäßMetallurgical vessel
1111
Innenraum GefäßInterior vessel
1212th
Mantelcoat
1313
FeuerfestauskleidungRefractory lining
1414
GlockeBell jar
1515
Deckelcover
1717th
GlockeninnenraumBell interior
Meß- und RegeleinrichtungMeasuring and control device

2121
MeßelementMeasuring element
2222
Meß- und RegelgerätMeasuring and control device
2323
Steuerorgan O2 Tax body O 2
2424th
Steuerleitung O2 Control line O 2
2525th
Steuerorgan BrennstoffControl unit fuel
2626
Steuerleitung BrennstoffControl line fuel
2727
MeßleitungMeasurement line
2828
Meßlanze TemperaturMeasuring probe temperature
2929
Meßelement DruckMeasuring element pressure
Medienmedia

3131
KombinationslanzeCombination lance
3232
Zuleitung SauerstoffSupply line oxygen
3333
Zuleitung metallische BrennstoffeSupply of metallic fuels
3434
Absperrung O2 Barrier O 2
3535
1. Absperrung Brennstoff1. Shut off fuel
3636
BrennstoffbehälterFuel tank
3737
2. Absperrung Feststoff2. Solid shut off
3838
Rohr FeststoffPipe solid
VakuumeinrichtungVacuum device

4141
VakuumanlageVacuum system
4242
SaugleitungSuction line
4343
VakuumgefäßVacuum vessel
4444
Deckelcover
4545
RH-GefäßRH vessel
4646
Rohr ZuführungPipe feeder
4747
Rohr AbführungPipe drainage
4848
Absperrung GlockeLocking bell
4949
Absperrung PfanneLocking pan
AA
Brennstofffuel
O2 O 2
Sauerstoffoxygen
TT
Temperaturtemperature
PP
Druckprint

Claims (3)

  1. A process for decarburisation of steel melts in a closed metallurgical vessel, which is connected to a vacuum system and into which oxygen may be introduced via a lance together with combustible substances via a feed means, wherein the following steps are performed:
    a) after introduction of the melt and continuous reduction of the pressure to below 100 mbar, a predeterminable quantity of excess oxygen is injected in addition to the supplementary oxygen used during the decarburisation phase to perform C burn-off, which quantity corresponds to the oxygen which is required during decarburisation for burning metallic fuels or fuel mixtures without having a disadvantageous effect on the decarburisation process,
    b) the excess oxygen is injected during the first 10 mins injection time once the pressure has fallen below 100 mbar,
    c) at the time of partial oxygen excess, metallic fuel is added in evenly distributed manner via a combination lance.
  2. A process according to claim 1,
    characterised in that
    the metallic fuel is aluminium powder or aluminium granules or a fuel mixture.
  3. A process according to claim 2,
    characterised in that
    the metallic fuel is added discontinuously in portions.
EP96938974A 1995-11-17 1996-11-06 Method for decarburizing steels melts Expired - Lifetime EP0861337B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19544166 1995-11-17
DE19544166 1995-11-17
DE19548641 1995-12-13
DE19548641 1995-12-13
PCT/DE1996/002165 WO1997019197A1 (en) 1995-11-17 1996-11-06 Method and device for decarburizing steels melts

Publications (2)

Publication Number Publication Date
EP0861337A1 EP0861337A1 (en) 1998-09-02
EP0861337B1 true EP0861337B1 (en) 2001-08-01

Family

ID=26020703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96938974A Expired - Lifetime EP0861337B1 (en) 1995-11-17 1996-11-06 Method for decarburizing steels melts

Country Status (13)

Country Link
US (1) US6235084B1 (en)
EP (1) EP0861337B1 (en)
JP (1) JP2000500528A (en)
KR (1) KR100287568B1 (en)
CN (1) CN1067438C (en)
AT (1) ATE203778T1 (en)
AU (1) AU7620696A (en)
CZ (1) CZ294517B6 (en)
DE (2) DE59607427D1 (en)
PL (1) PL192625B1 (en)
RU (1) RU2159819C2 (en)
TW (1) TW403788B (en)
WO (1) WO1997019197A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10347200B4 (en) * 2002-12-13 2005-07-21 Sms Mevac Gmbh Degassing of liquid steel
EP1428894A1 (en) * 2002-12-13 2004-06-16 SMS Mevac GmbH A method of degassing molten steel
GB0427832D0 (en) * 2004-12-20 2005-01-19 Boc Group Plc Degassing molten metal
US20110127701A1 (en) * 2009-11-30 2011-06-02 Grant Michael G K Dynamic control of lance utilizing co-flow fluidic techniques
US8323558B2 (en) * 2009-11-30 2012-12-04 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dynamic control of lance utilizing counterflow fluidic techniques
US8377372B2 (en) * 2009-11-30 2013-02-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dynamic lances utilizing fluidic techniques
CN101871035A (en) * 2010-05-31 2010-10-27 北京科技大学 Refining device and vacuum refining process for use in non-oriented silicon steel production
TWI515301B (en) * 2012-03-08 2016-01-01 杰富意鋼鐵股份有限公司 Method for manufacturing ultra low carbon steel by using vacuum-degassing system
CN103397137B (en) * 2013-08-02 2015-04-22 首钢总公司 Preparation method of wheel steel
KR101450651B1 (en) * 2013-11-27 2014-10-15 우진 일렉트로나이트(주) Continuous Temperature Sensor and RH apparatus including it
JP6331851B2 (en) * 2014-08-05 2018-05-30 新日鐵住金株式会社 Heating method of molten steel in ladle
KR102034264B1 (en) * 2018-08-03 2019-10-17 주식회사 포스코 Apparatus for processing hot metal and method for processing hot metal
JP7002656B2 (en) * 2018-11-16 2022-01-20 チンタオ・ユンル・アドバンスト・マテリアルズ・テクノロジー・カンパニー・リミテッド Powder atomization device and powder atomization method

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DE1758107B2 (en) * 1968-04-04 1976-03-04 Edelstahlwerk Witten Ag, 5810 Witten PROCESS FOR MANUFACTURING STAINLESS CHROME AND CHROME-NICKEL STEELS
US3702243A (en) * 1969-04-15 1972-11-07 Nat Steel Corp Method of preparing deoxidized steel
DE2114600B2 (en) * 1971-03-25 1981-05-07 Vacmetal Gesellschaft für Vakuum-Metallurgie mbH, 4600 Dortmund Process for targeted vacuum decarburization of high-alloy steels
JPS5381418A (en) * 1976-12-28 1978-07-18 Nippon Steel Corp Manufacture of low phosphorus steel by vacuum degassing method
SU789591A1 (en) * 1978-06-19 1980-12-23 Череповецкий Ордена Ленина Металлургический Завод Им. 50- Летия Ссср Method of producing low-carbon steel
US4612043A (en) * 1984-03-29 1986-09-16 Pennsylvania Engineering Corporation Steel making method
DE4442362C1 (en) * 1994-11-18 1996-04-18 Mannesmann Ag Method and appts. for performing a variety of processes on a melt using standard equipment
WO1997005291A1 (en) * 1995-08-01 1997-02-13 Nippon Steel Corporation Process for vacuum refining of molten steel

Also Published As

Publication number Publication date
EP0861337A1 (en) 1998-09-02
CN1067438C (en) 2001-06-20
US6235084B1 (en) 2001-05-22
KR100287568B1 (en) 2001-04-16
RU2159819C2 (en) 2000-11-27
WO1997019197A1 (en) 1997-05-29
CN1203634A (en) 1998-12-30
AU7620696A (en) 1997-06-11
ATE203778T1 (en) 2001-08-15
PL326635A1 (en) 1998-10-12
DE19680993D2 (en) 1999-01-28
KR19990067543A (en) 1999-08-25
CZ294517B6 (en) 2005-01-12
PL192625B1 (en) 2006-11-30
JP2000500528A (en) 2000-01-18
DE59607427D1 (en) 2001-09-06
CZ152598A3 (en) 1999-05-12
TW403788B (en) 2000-09-01

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