EP1332813B1 - Refractory nozzle for a metallurgical vessel - Google Patents

Refractory nozzle for a metallurgical vessel Download PDF

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Publication number
EP1332813B1
EP1332813B1 EP02027793A EP02027793A EP1332813B1 EP 1332813 B1 EP1332813 B1 EP 1332813B1 EP 02027793 A EP02027793 A EP 02027793A EP 02027793 A EP02027793 A EP 02027793A EP 1332813 B1 EP1332813 B1 EP 1332813B1
Authority
EP
European Patent Office
Prior art keywords
steel
heater
refractory nozzle
thermally insulating
opening
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
Application number
EP02027793A
Other languages
German (de)
French (fr)
Other versions
EP1332813A3 (en
EP1332813A2 (en
Inventor
Martin Kendall
Jean-Paul Verhoeven
Marc Timmermanns
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.)
Heraeus Electro Nite International NV
Original Assignee
Heraeus Electro Nite International NV
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Filing date
Publication date
Application filed by Heraeus Electro Nite International NV filed Critical Heraeus Electro Nite International NV
Publication of EP1332813A2 publication Critical patent/EP1332813A2/en
Publication of EP1332813A3 publication Critical patent/EP1332813A3/en
Application granted granted Critical
Publication of EP1332813B1 publication Critical patent/EP1332813B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means

Definitions

  • the invention relates to a refractory spout for a metallurgical vessel for molten steel having a top opening and a bottom end having a through hole and a side wall enclosing the passage opening inner wall.
  • Such spouts are widely known in metallurgy ( DE 195 26 970 A1 . DE 196 18 605 A1 . DE 196 51 533 A1 . DE 196 51 534 A1 . EP 379 647 A2 ).
  • a problem with these spouts is that they can be destroyed by the resulting thermal stresses when the hot molten metal comes in, or that metal is deposited on the inner wall of the spouts.
  • the spouts are usually preheated.
  • gas burners or induction heaters are used.
  • it is necessary that the preheating is completed before the melt flows into the spout in order to remove the burner in time from the flow area can. During this interval, however, the spout cools down, so that the problems mentioned can not be completely eliminated.
  • the invention has for its object to improve the known spouts and to make the preheating so that destructions due to thermal stresses or the freezing of molten metal to the inner wall of the spout are largely avoided.
  • the thermally insulating Material is cardboard or a material with a melting point below the melting point of steel. Such a material causes any metal melt which may freeze on it to be rinsed out of the spout after dissolution or melting of the material with the melt flow and does not clog it up.
  • the thermally insulating material is fibrous or formed by spraying.
  • the heater is suitably made of a steel. Also metals with a lower melting point than steel may be suitable. When the spout is used for molten steel, the heater dissolves as it passes through the melt so that it can flow freely through the spout. Any material which initially freezes on the heater is dissolved again and flushed out of the spout.
  • the heating and / or the thermally insulating material is formed by at least two extending in the longitudinal direction of the passage opening, circumferentially juxtaposed parts, since an arrangement formed in this way can be easier to manufacture. It makes sense that the two parts are uniform in order to simplify the production. The parts should touch each other or have mechanical (or electrical) contact with each other.
  • a heater 2 is arranged in the passage opening 1 of the spout.
  • the heater has a two-part (see Fig. 2) meandering structure. He is hung in the spout by means of retaining elements 3. These holding elements 3 rest on the upper edge of the spout.
  • the heater 2 is made of steel. The preheating phase can be extended by its arrangement in time until the molten metal passes through the spout. When using the spout for molten steel, the heater 2 can be and is flushed out of the spout.
  • the heater 2 has electrical contacts 4, of which only one is shown in the drawing for the sake of simplicity.
  • the second contact is usefully arranged at the corresponding end of the second part of the heater 2.
  • the division of the heater 2 can be seen in Fig. 2.
  • the two parts of the heater 2 are mechanically and electrically connected to each other at the contact point 5.
  • the inner wall 6 of the spout is formed of zirconia.
  • On its outer surface electrodes 7 are arranged, wherein between the electrodes 7 and the inner wall 6 of the spout a layer 8 of chromium dioxide powder is arranged, by means of which the contact between the electrodes 7 and the inner wall 6 is made.
  • the electrodes 7 are guided as electrical contacts 9 to the outside.
  • the spout has an outer housing 10 made of steel, which is bounded at its upper end by a sintered ring 11 made of ceramic material.
  • This insulating material 12 and the sintered ring 11 are formed of zirconia-mullite.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Refractory outlet comprises: an opening (1) having an upper and a lower end; an inner wall laterally enclosing the opening; and a heater (2) and/or a thermally insulating material which dissolves or combusts on contact with liquid steel. Preferred Features: The thermally insulating material is cardboard or a material with a melting point lying below the melting point of the steel, or has fibers and is applied by spraying. The heater is made from steel.

Description

Die Erfindung betrifft einen feuerfester Ausguss für ein metallurgisches Gefäß für Stahlschmelzen mit einer ein oberes und ein unteres Ende aufweisenden Durchlauföffnung und einer die Durchlauföffnung seitlich umschließenden Innenwand.The invention relates to a refractory spout for a metallurgical vessel for molten steel having a top opening and a bottom end having a through hole and a side wall enclosing the passage opening inner wall.

Derartige Ausgüsse sind in der Metallurgie vielfältig bekannt ( DE 195 26 970 A1 , DE 196 18 605 A1 , DE 196 51 533 A1 , DE 196 51 534 A1 , EP 379 647 A2 ). Ein Problem bei diesen Ausgüssen ist es, dass sie beim Einlaufen der heißen Metallschmelze durch die entstehenden thermischen Spannungen zerstört werden können oder dass Metall an der Innenwand der Ausgüsse abgeschieden wird. Um dies zu verhindern, werden die Ausgüsse üblicherweise vorgeheizt. Hierzu werden Gasbrenner oder Induktionsheizungen benutzt. Beispielsweise bei Gasbrennern ist es erforderlich, dass die Vorwärmphase vor dem Einfließen der Schmelze in den Ausguss beendet wird, um den Brenner rechtzeitig aus dem Durchflussbereich entfernen zu können. Während dieser Zwischenzeit kühlt der Ausguss jedoch ab, so dass die genannten Probleme nicht vollständig beseitigt werden können.Such spouts are widely known in metallurgy ( DE 195 26 970 A1 . DE 196 18 605 A1 . DE 196 51 533 A1 . DE 196 51 534 A1 . EP 379 647 A2 ). A problem with these spouts is that they can be destroyed by the resulting thermal stresses when the hot molten metal comes in, or that metal is deposited on the inner wall of the spouts. To prevent this, the spouts are usually preheated. For this gas burners or induction heaters are used. For example, in gas burners, it is necessary that the preheating is completed before the melt flows into the spout in order to remove the burner in time from the flow area can. During this interval, however, the spout cools down, so that the problems mentioned can not be completely eliminated.

Der Erfindung liegt die Aufgabe zugrunde, die bekannten Ausgüsse zu verbessern und das Vorheizen so zu gestalten, dass Zerstörungen durch thermische Spannungen oder das Anfrieren von Metallschmelze an der Innenwand des Ausgusses weitgehend vermieden werden.The invention has for its object to improve the known spouts and to make the preheating so that destructions due to thermal stresses or the freezing of molten metal to the inner wall of the spout are largely avoided.

Die Aufgabe wird gemäß Anspruch 1 gelöst. Dadurch wird ein relativ langsamer Temperaturanstieg des Materials des Ausgusses beim Einlaufen der Metallschmelze erreicht. Thermische Spannungen werden verringert und ein zu rasches Abkühlen und Anfrieren der mit der Innenwand in Berührung kommenden Metallschmelze wird weitgehend vermieden. Als zweckmäßig hat es sich erwiesen, dass das thermisch isolierende Material Pappe oder ein Material mit einem Schmelzpunkt, der unterhalb des Schmelzpunktes von Stahl liegt, ist. Ein solches Material bewirkt, dass eventuell an ihm anfrierende Metallschmelze nach Auflösen bzw. Schmelzen des Materials mit dem Schmelzfluss aus dem Ausguss herausgespült wird und ihn nicht zusetzt. Vorteilhafter weise ist das thermisch isolierende Material faserartig oder durch Aufsprühen ausgebildet.The problem is solved according to claim 1. As a result, a relatively slow increase in temperature of the material of the spout is achieved when the molten metal. Thermal stresses are reduced and too rapid cooling and freezing of the metal melt coming into contact with the inner wall is largely avoided. It has proved to be expedient that the thermally insulating Material is cardboard or a material with a melting point below the melting point of steel. Such a material causes any metal melt which may freeze on it to be rinsed out of the spout after dissolution or melting of the material with the melt flow and does not clog it up. Advantageously, the thermally insulating material is fibrous or formed by spraying.

Der Heizer ist zweckmäßigerweise aus einem Stahl gebildet. Auch Metalle mit einem niedrigeren Schmelzpunkt als Stahl können geeignet sein. Wenn der Ausguss für Stahlschmelzen eingesetzt wird, löst sich der Heizer während des Durchlaufens der Schmelze auf, so dass diese ungehindert durch den Ausguss fließen kann. Eventuell an dem Heizer zunächst anfrierendes Material wird wieder aufgelöst und aus dem Ausguss herausgespült.The heater is suitably made of a steel. Also metals with a lower melting point than steel may be suitable. When the spout is used for molten steel, the heater dissolves as it passes through the melt so that it can flow freely through the spout. Any material which initially freezes on the heater is dissolved again and flushed out of the spout.

Vorteilhaft ist es, dass der Heizen und/oder das thermisch isolierende Material durch mindestens zwei sich in Längsrichtung der Durchlauföffnung erstreckende, in Umfangsrichtung nebeneinander angeordnete Teile gebildet ist, da sich eine derart ausgebildete Anordnung leichter herstellen lässt. Dabei ist es sinnvoll, dass die beiden Teile gleichförmig ausgebildet sind, um die Fertigung zu vereinfachen. Dabei sollten sich die Teile gegenseitig berühren bzw. mechanischen (oder elektrischen) Kontakt zu einander aufweisen.It is advantageous that the heating and / or the thermally insulating material is formed by at least two extending in the longitudinal direction of the passage opening, circumferentially juxtaposed parts, since an arrangement formed in this way can be easier to manufacture. It makes sense that the two parts are uniform in order to simplify the production. The parts should touch each other or have mechanical (or electrical) contact with each other.

Nachfolgende wird ein Ausführungsbeispiel der Erfindung an Hand einer Zeichnung näher erläutert.Below, an embodiment of the invention will be explained in more detail with reference to a drawing.

In der Zeichnung zeigt:

Fig. 1
einen Längsschnitt durch einen erfindungsgemäßen Ausguss und
Fig. 2
einen weiteren Längsschnitt, senkrecht zu Fig. 1.
In the drawing shows:
Fig. 1
a longitudinal section through a spout according to the invention and
Fig. 2
a further longitudinal section, perpendicular to Fig. 1st

In der Durchlauföffnung 1 des Ausgusses ist ein Heizer 2 angeordnet. Der Heizer weist eine zweiteilige (s. Fig. 2) mäanderförmige Struktur auf. Er ist in den Ausguss mittels Halteelementen 3 eingehängt. Diese Halteelemente 3 liegen auf den oberen Rand des Ausgusses auf. Der Heizer 2 ist aus Stahl gebildet. Die Vorheizphase kann durch seine Anordnung zeitlich erstreckt werden bis die Metallschmelze durch den Ausguss hindurch läuft. Beim Einsatz des Ausgusses für Stahlschmelze läßt sich der Heizer 2 auf und wird aus dem Ausguss hinausgespült.In the passage opening 1 of the spout, a heater 2 is arranged. The heater has a two-part (see Fig. 2) meandering structure. He is hung in the spout by means of retaining elements 3. These holding elements 3 rest on the upper edge of the spout. The heater 2 is made of steel. The preheating phase can be extended by its arrangement in time until the molten metal passes through the spout. When using the spout for molten steel, the heater 2 can be and is flushed out of the spout.

Zu seinem elektrischen Anschluss weist der Heizer 2 elektrische Kontakte 4 auf, von denen in der Zeichnung der Einfachheit halber nur einer gezeigt ist. Der zweite Kontakt ist sinnvollerweise an dem entsprechenden Ende des zweiten Teiles der Heizung 2 angeordnet. Die Zweiteilung der Heizung 2 ist in Fig. 2 erkennbar. Die beiden Teile der Heizung 2 sind an der Kontaktstelle 5 miteinander mechanisch und elektrisch verbunden.For its electrical connection, the heater 2 has electrical contacts 4, of which only one is shown in the drawing for the sake of simplicity. The second contact is usefully arranged at the corresponding end of the second part of the heater 2. The division of the heater 2 can be seen in Fig. 2. The two parts of the heater 2 are mechanically and electrically connected to each other at the contact point 5.

Die Innenwand 6 des Ausgusses ist aus Zirkondioxid gebildet. An ihrer äußeren Oberfläche sind Elektroden 7 angeordnet, wobei zwischen den Elektroden 7 und der Innenwand 6 des Ausgusses eine Schicht 8 aus Chromdioxidpulver angeordnet ist, mittels derer der Kontakt zwischen den Elektroden 7 und der Innenwand 6 hergestellt ist. Die Elektroden 7 werden als elektrische Kontakte 9 nach außen geführt.The inner wall 6 of the spout is formed of zirconia. On its outer surface electrodes 7 are arranged, wherein between the electrodes 7 and the inner wall 6 of the spout a layer 8 of chromium dioxide powder is arranged, by means of which the contact between the electrodes 7 and the inner wall 6 is made. The electrodes 7 are guided as electrical contacts 9 to the outside.

Der Ausguss weist ein äußeres Gehäuse 10 aus Stahl auf das an seinem oberen Ende von einem Sinterring 11 aus keramischem Material begrenzt wird.The spout has an outer housing 10 made of steel, which is bounded at its upper end by a sintered ring 11 made of ceramic material.

Der verbleibende Raum innerhalb des Gehäuses 10 wird von einem isolierenden Material 12 ausgefüllt. Dieses isolierende Material 12 und der Sinterring 11 sind aus Zirkondioxid-Mullit gebildet. The remaining space within the housing 10 is filled by an insulating material 12. This insulating material 12 and the sintered ring 11 are formed of zirconia-mullite.

Claims (6)

  1. Refractory nozzle for a metallurgical vessel for steel melts, comprising a flow-through opening having an upper and a lower end, and an inner wall laterally enclosing the flow-through opening, characterised in that either a heater made of a steel or of metal with a lower melting point than steel or a combination of a heater and a material, which is thermally insulating and dissolves or combusts on contact with liquid steel, is arranged in the flow-through opening along the inner wall.
  2. Refractory nozzle according to claim 1, characterised in that the thermally insulating material is cardboard or a material with a melting point, which is below the melting point of steel.
  3. Refractory nozzle according to claim 1 or 2, characterised in that the thermally insulating material is fibrous or is formed by spraying on.
  4. Refractory nozzle according to any one of claims 1 to 3, characterised in that the heater and/or the thermally insulating material is formed by at least two parts extending in the longitudinal direction of the flow-through opening and arranged next to one another in the peripheral direction.
  5. Refractory nozzle according to claim 4, characterised in that the parts are formed with the same shape.
  6. Refractory nozzle according to claim 4 or 5, characterised in that the parts mutually touch.
EP02027793A 2002-02-01 2002-12-12 Refractory nozzle for a metallurgical vessel Expired - Lifetime EP1332813B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10204305 2002-02-01
DE10204305A DE10204305B4 (en) 2002-02-01 2002-02-01 Refractory spout for a metallurgical vessel

Publications (3)

Publication Number Publication Date
EP1332813A2 EP1332813A2 (en) 2003-08-06
EP1332813A3 EP1332813A3 (en) 2003-11-26
EP1332813B1 true EP1332813B1 (en) 2008-01-30

Family

ID=7713610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02027793A Expired - Lifetime EP1332813B1 (en) 2002-02-01 2002-12-12 Refractory nozzle for a metallurgical vessel

Country Status (10)

Country Link
US (1) US6832707B2 (en)
EP (1) EP1332813B1 (en)
JP (1) JP4316897B2 (en)
KR (1) KR100870162B1 (en)
CN (1) CN1286601C (en)
AT (1) ATE385208T1 (en)
BR (1) BR0300169B1 (en)
CA (1) CA2413492C (en)
DE (2) DE10204305B4 (en)
ES (1) ES2296871T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034426B3 (en) * 2007-07-20 2008-12-04 HAGENBURGER Feuerfeste Produkte für Gießereien und Stahlwerke KG Component of a casting system through which a molten metal can flow

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1275452A3 (en) * 2001-07-13 2003-12-10 Heraeus Electro-Nite International N.V. Refractory nozzle
PL3140066T3 (en) * 2014-05-05 2018-11-30 Refractory Intellectual Property Gmbh & Co. Kg Refractory ceramic casting nozzle
KR101951805B1 (en) * 2017-05-12 2019-02-25 손인철 Melt discharging device

Family Cites Families (13)

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US3435992A (en) * 1966-03-11 1969-04-01 Tisdale Co Inc Pouring nozzle for continuous casting liquid metal or ordinary steel
BE830039A (en) * 1975-06-09 1975-10-01 IMPROVEMENTS TO CASTING BUSETTES
JPS546816A (en) * 1977-06-20 1979-01-19 Kobe Steel Ltd Prevention of pouriggnozzle blockade
DE3903210C1 (en) * 1989-01-31 1990-06-28 Mannesmann Ag, 4000 Duesseldorf, De
US4946082A (en) * 1989-07-10 1990-08-07 General Electric Company Transfer tube with in situ heater
JPH05337635A (en) * 1992-06-05 1993-12-21 Aichi Steel Works Ltd Molten metal holding vessel
JPH05337645A (en) * 1992-06-08 1993-12-21 Ishikawajima Harima Heavy Ind Co Ltd Welding arc oscillating method
US5902509A (en) * 1995-07-25 1999-05-11 Dider-Werke Ag Method and apparatus for inductively heating a refractory shaped member
DE19526970C2 (en) * 1995-07-25 2000-11-16 Didier Werke Ag Process for induction heating of a refractory molded part
DE19603317A1 (en) * 1995-08-28 1997-03-06 Didier Werke Ag Method for operating an inductor and inductor for carrying out the method
DE19603607A1 (en) * 1995-10-05 1997-04-10 Didier Werke Ag Multi-region inductor unit
DE10132575C1 (en) * 2001-07-10 2002-07-04 Heraeus Electro Nite Int Refractory outlet used in the wall of a metallurgical vessel for steel melts has electrodes made from metal having a high melting point and/or formed from one of its oxides
DE10160070A1 (en) * 2001-12-06 2003-06-18 Sms Demag Ag Outlet used for steel melts comprises a casing arranged on outer surfaces enclosing an insulating material, and flow channels for the melt facing the insulating material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034426B3 (en) * 2007-07-20 2008-12-04 HAGENBURGER Feuerfeste Produkte für Gießereien und Stahlwerke KG Component of a casting system through which a molten metal can flow

Also Published As

Publication number Publication date
CN1435288A (en) 2003-08-13
DE10204305A1 (en) 2003-08-21
EP1332813A3 (en) 2003-11-26
US6832707B2 (en) 2004-12-21
KR100870162B1 (en) 2008-11-25
JP4316897B2 (en) 2009-08-19
ES2296871T3 (en) 2008-05-01
CA2413492C (en) 2009-09-29
DE10204305B4 (en) 2004-04-29
BR0300169B1 (en) 2011-11-16
BR0300169A (en) 2003-09-09
DE50211632D1 (en) 2008-03-20
CN1286601C (en) 2006-11-29
EP1332813A2 (en) 2003-08-06
JP2003245772A (en) 2003-09-02
US20030146553A1 (en) 2003-08-07
KR20030066342A (en) 2003-08-09
CA2413492A1 (en) 2003-08-01
ATE385208T1 (en) 2008-02-15

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