EP0249098A1 - Installation for reheating liquid steel tapped from a transport ladle - Google Patents

Installation for reheating liquid steel tapped from a transport ladle Download PDF

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Publication number
EP0249098A1
EP0249098A1 EP87107781A EP87107781A EP0249098A1 EP 0249098 A1 EP0249098 A1 EP 0249098A1 EP 87107781 A EP87107781 A EP 87107781A EP 87107781 A EP87107781 A EP 87107781A EP 0249098 A1 EP0249098 A1 EP 0249098A1
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EP
European Patent Office
Prior art keywords
liquid steel
heating
crucible furnace
fed
distribution channel
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.)
Withdrawn
Application number
EP87107781A
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German (de)
French (fr)
Inventor
Wolfgang Dr.-Ing. Schick
Erwin Dr.-Ing. Dötsch
Helmut Dipl.-Ing. Wicker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
Original Assignee
Brown Boveri und Cie AG Germany
BBC Brown Boveri AG Germany
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brown Boveri und Cie AG Germany, BBC Brown Boveri AG Germany filed Critical Brown Boveri und Cie AG Germany
Publication of EP0249098A1 publication Critical patent/EP0249098A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle

Definitions

  • the invention relates to a heating device for the liquid steel leaving a transport ladle, which is fed to a continuous casting distributor channel.
  • this object is achieved in that the liquid steel from the transport pan is fed to an inductively heated small crucible furnace (approx. 1 to 1.5 t capacity) for intermediate heating and is fed from the crucible furnace to the distribution channel.
  • the heating power supplied to the inductively heated crucible furnace is influenced as a function of the temperature of the liquid steel emerging from the transport pan and / or of the liquid steel supplied to the distribution channel.
  • the liquid steel can be fed from the warm-up crucible furnace in the overflow process or by means of pressure promotion into the distribution channel.
  • the heating-up crucible furnace can expediently be arranged on the stage of the distribution channel or on the rotating tower.
  • the heating-up crucible furnace can be arranged to be pivotable or tiltable.
  • the turret 1, which carries the transport pan 3 on a cantilever 2, is only indicated in FIG.
  • the line I-I represents the center of the ladle turret.
  • the transport pan 3 has a slide closure, not visible in this illustration, from which the liquid steel flows into the crucible furnace 4.
  • This crucible furnace has a capacity of approximately 1 to 1.5 tons of liquid steel.
  • This crucible furnace is used to heat the liquid steel flowing out of the transport pan 3, so that the liquid steel reaching the distribution channel 6 always has the same temperature.
  • the induction coils, not shown, of the crucible furnace 4 are connected via cables 10 to a frequency generator, not shown.
  • the crucible furnace 4 for heating the liquid steel is arranged in the system shown on a stage 5, on which the distributor channel 6 is also located.
  • the crucible furnace 4 is arranged on a support frame 7 in the embodiment shown, so that the connecting channel 9 arranged between the spout 8 of the crucible furnace and the distribution channel 6 has a sufficient gradient for the liquid steel so that the steel emerging from the crucible furnace reaches the distribution channel 6 with certainty .
  • the heating power for the induction coils of the crucible furnace 4 can be controlled as a function of the temperature of the steel leaving the transport pan. It is also possible to use the temperature of the liquid steel leaving the connecting channel to regulate the heating power for the induction coils. It is particularly expedient if both measured values influence the heating power supplied to the inductor coils.
  • the liquid steel flows overflow from the crucible furnace 4 and via the connecting trough 9 to the distributor trough 6. If this is not possible, the liquid steel can also be fed into the distributor trough 6 by means of pressure promotion.
  • the crucible furnace 4 can also be attached to the rotating tower 1. This has the advantage that the induction crucible furnace is easy to replace.
  • the induction crucible furnace is pivoted so that it is possible to work both with and without an inductively heated intermediate vessel.
  • the induction crucible is tiltable.
  • the spout 8 of the induction crucible furnace is provided with a slag snout so that the slag produced is retained at this point.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • General Induction Heating (AREA)

Abstract

Installation for reheating the liquid steel tapped from a transport ladle (3), which steel is fed to a continuous-casting distributing launder. In continuous-casting plants of this kind, the temperature of the liquid steel decreases slowly due to heat losses during casting. In order to avoid this, the intention is to provide an apparatus with which heating is possible without disturbing the liquid steel in the distributing launder. This is achieved in that the liquid steel is fed, for the purpose of intermediate heating, from the transport ladle (3) to a small, inductively heated crucible furnace (4) (about 1 to 1.5 t) and is passed from the crucible furnace (4) to the distributing launder (6). The heating power fed to the crucible furnace (4) can be influenced as a function of the temperature of the liquid steel emerging from the transport ladle (3) and/or of the liquid steel fed to the distributing launder (6). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Aufwärmvorrichtung für den eine Transportpfanne verlassenden Flüssigstahl, der einer Stranggußverteilerrinnne zugeführt wird.The invention relates to a heating device for the liquid steel leaving a transport ladle, which is fed to a continuous casting distributor channel.

Bei Stranggußanlagen in der Stahlindustrie tritt oft der Fall ein, daß die Temperatur des Flüssigstahls durch die Wärmeverluste der Transportpfanne während des Gießens langsam abnimmt. Um diese Temperaturabnahme zu kompen­sieren, ist eine Anordnung beim sogenannten Waagrecht-­Stranggießen bekanntgeworden. Bei diesem Verfahren ist die Kokille horizontalliegend angeordnet und der Strang wird horizontal aus dieser Kokille gezogen. Zum Aus­gleich von Wärmeverlusten wird das Gießgefäß mittels ei­nes Rinneninduktors beheizt (Stahl und Eisen 1984, Heft 12/13 Seite 590 bis 594).In the case of continuous casting plants in the steel industry, there is often the case that the temperature of the molten steel slowly decreases due to the heat losses of the transport pan during the casting. In order to compensate for this decrease in temperature, an arrangement in so-called horizontal continuous casting has become known. In this process, the mold is arranged horizontally and the strand is pulled horizontally from this mold. To compensate for heat losses, the casting vessel is heated by means of a channel inductor (Stahl und Eisen 1984, issue 12/13 pages 590 to 594).

Weiter ist ein Verfahren bekanntgeworden, bei dem die Verteilerrinne mit Hilfe eines Rinneninduktors direkt beheizt wird (Stahl und Eisen 1984, Nr. 9, Seite 428).A method has also become known in which the distributor channel is heated directly with the aid of a channel inductor (Stahl and Eisen 1984, No. 9, page 428).

Es hat sich jedoch als nachteilig gezeigt, daß die elek­tromagnetischen Kräfte, die auf den Flüssigstahl einwir­ken, den Flüssigstahl in der Verteilerrinne beunruhigen, so daß sich nicht immer die gewünschten Gußqualitäten ergeben.However, it has been shown to be disadvantageous that the electromagnetic forces acting on the liquid steel disturb the liquid steel in the distribution channel, so that the desired casting qualities are not always obtained.

Es ist daher Aufgabe der Erfindung, eine Vorrichtung zu schaffen, mit der eine Erwärmung möglich ist, ohne den Flüssigstahl in der Verteilerrinne zu beunruhigen.It is therefore an object of the invention to provide a device with which heating is possible without disturbing the liquid steel in the distribution channel.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß der Flüssigstahl aus der Transportpfanne einem in­duktiv beheizten kleinen Tiegelofen (ca. 1 bis 1,5t Fassungsvermögen) zur Zwischenerwärmung zugeführt und von dem Tiegelofen der Verteilerrinne zu­geleitet wird. Nach einem weiteren Merkmal der Erfindung wird die dem induktiv beheizten Tiegelofen zugeführte Heizleistung in Abhängigkeit von der Temperatur des aus der Transportpfanne austretenden und/oder des der Ver­teilerrinne zugeführten Flüssigstahls beeinflußt. Der Flüssigstahl kann aus dem Aufwärm-Tiegelofen im Über­laufverfahren oder mittels Druckförderung in die Ver­teilerrinne geleitet werden. Weiterhin kann zweckmäßig der Aufwärm-Tiegelofen auf der Bühne der Verteilerrinne oder auf dem Drehturm angeordnet sein. Weiterhin kann der Aufwärm-Tiegelofen schwenkbar bzw. kippbar angeord­net sein.According to the invention, this object is achieved in that the liquid steel from the transport pan is fed to an inductively heated small crucible furnace (approx. 1 to 1.5 t capacity) for intermediate heating and is fed from the crucible furnace to the distribution channel. According to a further feature of the invention, the heating power supplied to the inductively heated crucible furnace is influenced as a function of the temperature of the liquid steel emerging from the transport pan and / or of the liquid steel supplied to the distribution channel. The liquid steel can be fed from the warm-up crucible furnace in the overflow process or by means of pressure promotion into the distribution channel. Furthermore, the heating-up crucible furnace can expediently be arranged on the stage of the distribution channel or on the rotating tower. Furthermore, the heating-up crucible furnace can be arranged to be pivotable or tiltable.

Die Figuren zeigen ein Ausführungsbeispiel der Erfin­dung.The figures show an embodiment of the invention.

Es zeigen:

  • Fig. 1 Eine teilweise geschnittene Ansicht einer Gießanlage mit Transportpfanne, Aufwärm-Tie­gelofen und Verteilerrinne und
  • Fig. 2 eine Draufsicht der Anlage gemäß Fig. 1.
Show it:
  • Fig. 1 is a partially sectioned view of a casting machine with a ladle, heating crucible and distribution channel and
  • FIG. 2 shows a top view of the plant according to FIG. 1.

Der Drehturm 1, der an einem Ausleger 2 die Transport­pfanne 3 trägt, ist in Figur 1 nur angedeutet. Die Linie I-I stellt die Mitte des Pfannendrehturms dar. Die Transportpfanne 3 besitzt am Boden einen in dieser Dar­stellung nicht sichtbaren Schieberverschluß, aus dem der Flüssigstahl in den Tiegelofen 4 fließt. Dieser Tiegelofen hat eine Kapazität von etwa 1 bis 1,5t Flüssigstahl. Dieser Tiegelofen dient zur Erwärmung des aus der Transportpfanne 3 ausfließenden Flüssigstahls, so daß der die Verteilerrinnne 6 erreichende Flüssigstahl immer die gleiche Temperatur besitzt. Die nicht dargestellten Induktionsspulen des Tiegelofens 4 sind über Kabel 10 mit einem nicht dargestellten Frequenzerzeuger verbunden.The turret 1, which carries the transport pan 3 on a cantilever 2, is only indicated in FIG. The line I-I represents the center of the ladle turret. The transport pan 3 has a slide closure, not visible in this illustration, from which the liquid steel flows into the crucible furnace 4. This crucible furnace has a capacity of approximately 1 to 1.5 tons of liquid steel. This crucible furnace is used to heat the liquid steel flowing out of the transport pan 3, so that the liquid steel reaching the distribution channel 6 always has the same temperature. The induction coils, not shown, of the crucible furnace 4 are connected via cables 10 to a frequency generator, not shown.

Der Tiegelofen 4 zum Erwärmen des Flüssigstahls ist bei der dargestellten Anlage auf einer Bühne 5, auf der sich auch die Verteilerrinne 6 befindet, angeordnet. Der Tie­gelofen 4 ist bei der dargestellten Ausführungsform auf einem Traggerüst 7 angeordnet, damit die zwischen dem Ausguß 8 des Tiegelofen und der Verteilerrinne 6 ange­ordneten Verbindungsrinne 9 ein ausreichendes Gefälle für den Flüssigstahl besitzt, damit der aus dem Tiegelofen austretende Stahl mit Sicherheit die Verteilerrinne 6 erreicht. In Abhängigkeit von der Temperatur des die Transportpfanne verlassenden Stahls kann die Heizleistung für die Induktionsspulen des Tiegelofens 4 gesteuert werden. Auch ist es möglich, die Temperatur des die Verbindungsrinne verlassenden Flüssigstahls zur Regelung der Heizleistung für die Induktionsspulen zu benutzen. Besonders zweckmäßig ist es, wenn beide Meßwerte die den Induktorspulen zugeführte Heizleistung beeinflussen.The crucible furnace 4 for heating the liquid steel is arranged in the system shown on a stage 5, on which the distributor channel 6 is also located. The crucible furnace 4 is arranged on a support frame 7 in the embodiment shown, so that the connecting channel 9 arranged between the spout 8 of the crucible furnace and the distribution channel 6 has a sufficient gradient for the liquid steel so that the steel emerging from the crucible furnace reaches the distribution channel 6 with certainty . The heating power for the induction coils of the crucible furnace 4 can be controlled as a function of the temperature of the steel leaving the transport pan. It is also possible to use the temperature of the liquid steel leaving the connecting channel to regulate the heating power for the induction coils. It is particularly expedient if both measured values influence the heating power supplied to the inductor coils.

In dem dargestellten Ausführungsbeispiel fließt der Flüssigstahl im Uberlaufverfahren aus dem Tiegelofen 4 und über die Verbindungsrinne 9 zur Verteilerrinne 6. Falls dies nicht möglich ist, kann der Flüssigstahl auch mittels Druckförderung in die Verteilerrinne 6 geleitet werden. Weiterhin kann der Tiegelofen 4 auch an dem Drehturm 1 befestigt sein. Dies hat den Vorteil, daß der Induktions-Tiegelofen leicht auswechselbar ist. Der In­duktions-Tiegelofen ist schwenkbar angeordnet, damit die Möglichkeit besteht, sowohl mit als auch ohne induktiv beheiztem Zwischengefäß arbeiten zu können. Weiterhin ist der Induktions-Tiegelofen kippbar angeordnet. Der Ausguß 8 des Induktions-Tiegelofens ist mit einer Schlackenschnauze versehen, damit die entstehende Schlacke an dieser Stelle zurückgehalten wird.In the exemplary embodiment shown, the liquid steel flows overflow from the crucible furnace 4 and via the connecting trough 9 to the distributor trough 6. If this is not possible, the liquid steel can also be fed into the distributor trough 6 by means of pressure promotion. Furthermore, the crucible furnace 4 can also be attached to the rotating tower 1. This has the advantage that the induction crucible furnace is easy to replace. The induction crucible furnace is pivoted so that it is possible to work both with and without an inductively heated intermediate vessel. Furthermore, the induction crucible is tiltable. The spout 8 of the induction crucible furnace is provided with a slag snout so that the slag produced is retained at this point.

Claims (9)

1. Aufwärmeinrichtung für den eine Transportfanne verlassenden Flüssigstahl, der einer Stranggußverteiler­rinne zugeführt wird,dadurch gekennzeichnet, daß der Flüssigstahl aus der Transportpfanne (3) einem induktiv beheizten kleinen Tiegelofen (ca. 1 bis 1,5t) zur Zwi­schenerwärmung zugeführt und von dem Tiegelofen (4) der Verteilerrinne (6) zugeleitet wird.1. Heating device for the liquid steel leaving a transport pan, which is fed to a continuous casting distribution channel, characterized in that the liquid steel from the transport pan (3) is fed to an inductively heated small crucible furnace (approx. 1 to 1.5 t) for intermediate heating and from the crucible furnace ( 4) the distribution channel (6) is fed. 2. Aufwärmeinrichtung nach Anspruch 1, dadurch ge­kennzeichnet, daß die dem induktiv beheizten Tiegelofen (4) zugeführte Heizleistung in Abhängigkeit von der Tem­peratur des aus der Transportpfanne austretenden und/­oder des der Verteilerrinne (6) zugeführten Flüssig­stahls beeinflußt wird.2. Warming-up device according to claim 1, characterized in that the heating power supplied to the inductively heated crucible furnace (4) is influenced as a function of the temperature of the liquid steel emerging from the transport pan and / or of the distribution channel (6). 3. Aufwärmeinrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß der Flüssigstahl aus dem kleinen Tiegelofen (4) nach Erwärmung im Uberlauf­verfahren in die Verteilerrinne (6) geleitet wird.3. Heating device according to one of claims 1 to 2, characterized in that the liquid steel from the small crucible furnace (4) after heating in the overflow process in the distribution channel (6) is passed. 4. Aufwärmeinrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß der Flüssigstahl aus dem kleinen Tiegelofen nach Erwärmung mittels Druckför­derung in die Verteilerrinne gefördert wird.4. Warming-up device according to one of claims 1 to 2, characterized in that the liquid steel is conveyed from the small crucible furnace after heating by means of pressure promotion into the distribution channel. 5. Aufwärmeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Tiegelofen zum Aufwärmen auf der Bühne der Verteilerrinne (6) angeordnet ist.5. Heating device according to one of claims 1 to 4, characterized in that the crucible furnace for heating is arranged on the stage of the distribution channel (6). 6. Aufwärmeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Tiegelofen zum Aufwärmen auf dem Drehturm angeordnet ist.6. Warming-up device according to one of claims 1 to 4, characterized in that the crucible furnace is arranged for heating on the rotating tower. 7. Aufwärmeinrichtung nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß der Auf­wärm-Tiegelofen (4) schwenkbar angeordnet ist.7. heating device according to one of claims 5 or 6, characterized in that the heating-up crucible furnace (4) is arranged pivotably. 8. Aufwärmeinrichtung nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß der Auf­wärm-Tiegelofen (4) kippbar angeordnet ist.8. Warming device according to one of claims 5 or 6, characterized in that the heating-up crucible furnace (4) is arranged to be tiltable. 9. Aufwärmeinrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Aufwärm-Teigelofen (4) mit einer Schlackeschnauze ausgerüstet ist.9. Warming device according to one of claims 1 to 8, characterized in that the warming-up dough oven (4) is equipped with a slag snout.
EP87107781A 1986-06-07 1987-05-29 Installation for reheating liquid steel tapped from a transport ladle Withdrawn EP0249098A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619273 1986-06-07
DE19863619273 DE3619273A1 (en) 1986-06-07 1986-06-07 WARM-UP DEVICE FOR THE LIQUID STEEL LEAVING A TRANSPORT PAN

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EP0249098A1 true EP0249098A1 (en) 1987-12-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113426970A (en) * 2021-06-11 2021-09-24 一重集团大连工程技术有限公司 Vertical semi-continuous production device and production process of large round billets with phi of 1000 mm-2000 mm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1062330A (en) * 1951-09-13 1954-04-21 Method and installation for the continuous casting of elongated ingots or bars
FR2077767A1 (en) * 1970-02-12 1971-11-05 Lectromelt Corp Transporting crucible for conveying molten - metal from furnace to moulds
FR2481163A1 (en) * 1980-04-23 1981-10-30 Vallourec Feeding molten metal, esp. steel, into continuous casting plant - part of metal in large ladle being fed into sec ladle for reheating and adjustment of its compsn.
JPS58148057A (en) * 1982-02-26 1983-09-03 Nippon Steel Corp Method for heating molten steel for continuous casting
JPS59159255A (en) * 1983-02-28 1984-09-08 Kawasaki Steel Corp Controlling method of heating molten metal in tundish

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1062330A (en) * 1951-09-13 1954-04-21 Method and installation for the continuous casting of elongated ingots or bars
FR2077767A1 (en) * 1970-02-12 1971-11-05 Lectromelt Corp Transporting crucible for conveying molten - metal from furnace to moulds
FR2481163A1 (en) * 1980-04-23 1981-10-30 Vallourec Feeding molten metal, esp. steel, into continuous casting plant - part of metal in large ladle being fed into sec ladle for reheating and adjustment of its compsn.
JPS58148057A (en) * 1982-02-26 1983-09-03 Nippon Steel Corp Method for heating molten steel for continuous casting
JPS59159255A (en) * 1983-02-28 1984-09-08 Kawasaki Steel Corp Controlling method of heating molten metal in tundish

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 269 (M-259)[1414], 30. November 1983; & JP-A-58 148 057 (SHIN NIPPON SEITETSU K.K.) 03-09-1983 *
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 11 (M-351)[1734], 18. Januar 1985; & JP-A-59 159 255 (KAWASAKI SEITETSU K.K.) 08-09-1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113426970A (en) * 2021-06-11 2021-09-24 一重集团大连工程技术有限公司 Vertical semi-continuous production device and production process of large round billets with phi of 1000 mm-2000 mm

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