EP0065514B1 - Thermisch isolierendes giessrohr für metallurgisches gefäss - Google Patents

Thermisch isolierendes giessrohr für metallurgisches gefäss Download PDF

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Publication number
EP0065514B1
EP0065514B1 EP80902236A EP80902236A EP0065514B1 EP 0065514 B1 EP0065514 B1 EP 0065514B1 EP 80902236 A EP80902236 A EP 80902236A EP 80902236 A EP80902236 A EP 80902236A EP 0065514 B1 EP0065514 B1 EP 0065514B1
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EP
European Patent Office
Prior art keywords
tube
ring
casting
accordance
nozzle
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
Application number
EP80902236A
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English (en)
French (fr)
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EP0065514A1 (de
Inventor
Jean-Charles Daussan
Gérard Daussan
André Daussan
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Daussan SAS
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Daussan SAS
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Filing date
Publication date
Application filed by Daussan SAS filed Critical Daussan SAS
Priority to AT80902236T priority Critical patent/ATE13829T1/de
Publication of EP0065514A1 publication Critical patent/EP0065514A1/de
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Publication of EP0065514B1 publication Critical patent/EP0065514B1/de
Expired 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/502—Connection arrangements; Sealing means therefor

Definitions

  • the present invention relates to a thermally insulating pouring tube intended to be placed between the pouring orifice of a first metallurgical container such as a ladle and a second metallurgical container such as a tundish.
  • the tube material is highly refractory such as silica, magnesia, zirconia, and isostatically pressed carbon.
  • these tubes require long and costly preheating before casting the liquid metal, to limit the risks of solidification of this metal in contact with their wall, this solidification being able to generate a complete sealing of these tubes.
  • the material tends to crumble quickly, so that at the end of casting, the seal is no longer formed between the pouring tube and the pouring nozzle on which its end is engaged.
  • French Patent 1,551,363 describes a conventional refractory material pouring nozzle, that is to say practically free of organic material. At the top of this nozzle and on the internal surface of the latter is inserted a ring of refractory material harder than the refractory material of the nozzle. The role of this hard ring is to limit the wear caused at the entry of the nozzle, by the passage of liquid metal.
  • a ring of refractory material if it was placed inside a tube of insulating and sinterable material, as described in French Patent No. 2,333,599, on the one hand would not solve the problem the crumbling of the material of the tube in the part which surrounds the nozzle and the other by risking causing the solidification of the metal in contact with this ring.
  • the object of this invention is therefore to overcome this drawback, by creating a pouring tube having all the advantages of the tubes described in French patent n ° 2 333 599, while having a considerably prolonged life.
  • the thermally insulating pouring tube intended to be placed between the pouring orifice of a first metallurgical container and a second metallurgical container, one end of the pouring tube being intended to be engaged in a removable manner and substantially sealed on the pouring nozzle or on an adapter extending the nozzle of the first container, this pouring tube being made of a material consisting of inorganic particles optionally added with fibers, coated in a binder, these inorganic particles being sinterable under the effect of the heat of the liquid metal passing through this tube, is characterized in that the end of the tube intended to be engaged on the pouring nozzle comprises a ring of refractory material practically free of organic matter, the internal surface of this ring being intended to come into direct contact with the pouring nozzle or with the adapter extending the nozzle, the height of this ring being sufficient sufficiently weak so that the lower part of the internal surface of the ring cannot come into contact with the liquid metal passing through this tube.
  • This refractory ring thus mechanically strengthens the part of the pouring tube which does not undergo the sintering effect indicated in the introduction to this description.
  • this refractory ring does not reduce insulating properties of the pouring tube and does not entail any risk of solidification of the liquid metal, since this ring does not come into direct contact with this metal.
  • the height of the aforementioned refractory ring is at least equal to the distance over which the end of the tube is intended to be engaged on the pouring nozzle of the first metallurgical container.
  • the pouring tube is produced by molding and the ring of refractory material is fixed to the material of the wall of the tube, during this molding.
  • the fixing of the refractory ring to the tube can thus be carried out without any additional difficulty.
  • this end of the pouring tube also includes a refractory ring.
  • this end of the pouring tube is not liable to wear out by melting on contact with the liquid metal, and therefore, the life of this tube is further extended.
  • the bottom 2 of the ladle 1 includes a pouring nozzle 3 made of a highly refractory material such as silica, magnesia, refractory brick or zirconia.
  • This pouring nozzle 3 is arranged above a pouring distributor 4. Around this nozzle 3, is engaged in a removable manner, the upper end 5a of a pouring tube 5, slightly frustoconical whose lower end is intended to be immersed in the liquid metal which is introduced into the tundish 4.
  • the removable fastening means of the pouring tube 5 to the nozzle 3 are not shown. These means can be of the kind described in French patents No. 2,333,599 and No. 2,409,809.
  • the pouring tube 5 comprises an outer protective sleeve 6 made of metal sheet, for example of steel, which surrounds an inner wall 7 made of a thermally insulating and light material.
  • This material consists of inorganic particles (silica, alumina, magnesia), added with inorganic fibers, coated in an organic binder such as a synthetic resin or an inorganic binder.
  • the composition of this material is such that the inorganic particles sinter under the effect of the heat given off by the molten metal which is poured into the tube, which makes it possible to maintain the cohesion and the insulating properties of this material, despite the decomposition of the organic components of it.
  • the end 5a of the tube 5 engaged on the pouring nozzle 3 comprises a ring 8 of refractory material, the internal surface 8a of this ring being in direct contact with the casting nozzle 3.
  • the refractory material of the ring 8 is of the same nature as that of the nozzle 3. It can be, for example, silica, magnesia, refractory brick, isostatically pressed carbon or chamotte. These materials all have the advantage of having excellent mechanical and thermal resistance. In addition, they have a very high dimensional stability, so that it is possible to obtain a very precise adjustment of the ring 8 on the nozzle 3.
  • the height of the refractory ring 8 is greater than the distance over which the end 5a of the tube 5 is engaged on the pouring nozzle 3.
  • the thickness of the wall of the refractory ring 8 is substantially equal to the thickness of the wall 7 of the tube 5, so that the inner 8a and outer surfaces of the ring 8 are located substantially in the extension inner 7a and outer surfaces of the wall 7 of the tube 5.
  • the thermally insulating wall 7 is obtained by molding in a mold, the outer wall of which is formed by the sheet 6. This molding makes it possible to obtain direct adhesion of the material of the wall 7 to the sheet 6. In addition, the direct connection between the material of the wall 7 and the refractory ring 8 can also be obtained during this molding. We can nevertheless provide other means of fixing the ring 8 to the sheet 6 and / or to the insulating wall 7, such as screws, cement or glue.
  • the contact surface between the refractory ring 9 and the insulating material constituting the wall 7 of the pouring tube comprises an annular recess 10.
  • the ring 9 is thus fitted onto the wall 7, which improves the mechanical connection between this wall 7 and the ring 9 obtained during molding.
  • this annular step 10 makes it possible to maintain a certain thermal insulation in the part 7b of the wall 7.
  • the thickness of the wall of the ring 11 is less than that of the wall 7 of the tube, the internal surface 11 a of this ring 11 being arranged substantially in the extension of the internal surface 7a of the wall 7.
  • This ring 11 is thus entirely embedded in an annular recess 7c formed at the end of the tube. This arrangement is favorable as regards the solidity of the fixing of the ring 11 to the wall 7 and the thermal insulation at the level of the ring 11 in the part 7d.
  • the refractory ring 12 has an inner diameter smaller than the inner diameter of the tube and the outer surface 12a of this ring is arranged in the extension of the inner surface 7a of the tube.
  • the fixing of this ring 12 in the tube is ensured by the fitting which results from the taper of the outer surface 12a of the ring 12 and of the inner surface 7a of the tube.
  • This fixing can possibly be reinforced by gluing or other suitable mechanical means.
  • the refractory ring 13 has an outside diameter greater than the inside diameter of the tube and this ring is a part embedded in an annular shoulder 13a formed in the wall 7.
  • the refractory ring 14 has at the upper part of its internal surface an annular widening 14a, receiving the free end of the nozzle 3.
  • This arrangement improves the seal between the upper part of the tube and the nozzle 3.
  • the shoulder 14b constitutes a stop which ensures perfect axial positioning of the tube relative to the nozzle while avoiding any risk of relative entanglement between the nozzle and the ring 14.
  • the rings according to the invention undergo no chemical transformation.
  • these rings are generally made of a refractory material of the same kind as that of the nozzle 3, these rings undergo thermal expansion comparable to that of the nozzle 3, so that no play is formed between these rings and the nozzle.
  • the junction thus remains perfectly sealed and any possible introduction of air inside the tube and any risk of oxidation of the liquid metal are avoided.
  • the decomposition of the zone 16b of the wall 7 of the tube 5 does not cause any drawback, because the ring 8 ensures at the end of casting, as at the beginning of it, a perfect seal between the nozzle 3 and the tube 5.
  • the part of the wall 7 located below the zone 16b remains perfectly coherent retains a high thermal insulation power due to the porous structure obtained by sintering.
  • the tube according to the invention remains usable for several successive castings.
  • the outer sheet 6 melts in contact with the liquid metal and the same applies to the material of the wall 7 of the tube. This can also prevent the reuse of the pouring tube 5.
  • This ring 16 corresponds at least to the depth of immersion of the end of the pouring tube in the metal 17 contained in the tundish.
  • the thickness of the wall of this ring 16 is substantially equal to the thickness of the wall 7 of the tube, plus that of the sheet 6. This sheet 6 completely covers the wall 7 of the tube and stops at the level of the ring 16 to avoid any direct contact with the liquid metal 17.
  • the ring 16 can be fixed to the wall 7 of the tube 5 during the molding of this wall, as in the case of the upper rings shown in FIGS. 1 to 7.
  • the fixing of this ring 16 to the wall 7 is improved when the contact surface of this attachment has an annular recess 16a as shown in FIG. 8.
  • the end of the tube 5 does not risk being damaged in contact with the liquid metal 17, and therefore, this tube can be reused for several successive castings.
  • an adapter 18 is interposed between a short nozzle 19, and the pouring tube 5, as indicated in FIG. 9.
  • This nozzle 19 is part of the drawer 20 of a system of 'opening and closing called “drawer nozzle" of the orifice of a ladle.
  • the adapter 18 of refractory material has at its upper part an annular cavity 21 which receives the end of the nozzle 19.
  • the frustoconical lower end 18a of the adapter 18 is fitted in a sealed manner in the interior surface 11 a of a refractory ring 11.
  • the refractory ring 11 plays. the same role vis-à-vis the adapter 18 as vis-à-vis the casting nozzle 3 in the case of the previous embodiments.
  • This adapter 18 is necessary in all cases where the pouring nozzle is too short. This adapter 18 sometimes also acts as a box for collecting the gases intended to be blown into the liquid steel.
  • the shape and method of attachment of the upper refractory ring can be changed to suit all possible shapes of nozzles, provided that the inner surface of the ring is in direct contact with the outer surface of the nozzle.
  • the shape and the method of fixing the lower ring 16 can be modified provided that the liquid metal contained in the tundish does not come into direct contact with the insulating wall 7 and with the outer sheet 6.
  • pouring tube according to the invention can be used for other metallurgical vessels than the ladles and the tundish.
  • the outer sheet 6 of the pouring tube 5 prefferably includes an annular bead 22 projecting outwards (see FIG. 2) defining an empty annular space 23 between the sheet and the thermally insulating inner wall 7 .
  • This bead 22 serves to maintain, by means of a support 24, the tube 5 in abutment against the external surface of the nozzle 3.
  • the empty annular space 23 communicates with a horizontal tube 25 connected to a source of non-oxidizing or inert gas such as argon.
  • This bead 22 is preferably arranged opposite the non-sinterable zone 16b adjacent to the ring 8 of the wall 7, which remains porous.
  • the gas introduced into the annular space 19 diffuses through the wall 7, in a regular manner, all around the latter and penetrates inside the tube 7, providing the liquid metal with additional protection against the 'oxidation.
  • the outer sheet 6 has at its upper part a second annular bead, constituted by a winding 26 from the edge of the sheet inward.
  • This winding 26 is supported on the adjacent end of the insulating wall 7.
  • This winding 26 defines an annular duct communicating with an inlet pipe 28 of inert gas such as argon.
  • the winding 26 has a series of openings 27 directed radially towards the axis of the tube 5.
  • the advantage of this arrangement is as follows: since the ring 8 is made of hard refractory material, this material is liable to flake when it is brought too suddenly into contact with the refractory and hard material of the same kind than the nozzle 3 or the extension 19.
  • the scales thus formed can generate air inlets inside the pouring tube 5, by suction (Venturi effect).
  • the winding 26 provided with openings 27 makes it possible to produce jets of argon or other inert gas all around the nozzle 3, thereby avoiding any penetration of air inside the tube 5.

Claims (16)

1. Wärmeisolierendes Gießrohr (5) zur Anbringung zwischen der Gießöffnung eines ersten Schmelzebehälters (1) und einem zweiten Schmelzebehälter (4), wobei das eine Ende (5a) des Gießrohres zum lösbaren und im wesentlichen dichten Aufschieben auf die Gießdüse (3) des ersten Behälters (1) oder auf ein diese Gießdüse (19) verlängerndes Übergangsstück (18) vorgesehen ist und das Gießrohr aus einem Werkstoff ist, der aus anorganischen Teilchen, denen gegebenenfalls Fasern beigegeben sind und die mit einem Bindemittel umhüllt sind, besteht, wobei diese anorganischen Teilchen durch die Hitze der das Gießrohr durchfließenden Metallschmelze sinterbar sind, dadurch gekennzeichnet, daß das zum Aufschieben auf die Gießdüse (3) vorgesehene Ende des Gießrohres einen Ring (8, 9, 11, 12, 13, 14) aus einem feuerfesten Werkstoff praktisch ohne organischen Werkstoff umfaßt, wobei die Innenfläche dieses Ringes zur unmittelbaren Anlage an der Gießdüse (3) oder an dem die Gießdüse (19) verlängernden Übergangsstück (18) bestimmt ist und die Höhe dieses Ringes hinreichend klein ist, daß der untere Teil der Innenfläche des Ringes nicht mit der durch das Gießrohr strömenden Metallschmelze in Berührung kommen kann.
2. Gießrohr nach Anspruch 1, dadurch gekennzeichnet, daß die Höhe des Ringes (8, 9, 11, 12, 13, 14) aus feuerfestem Material wenigstens gleich der Länge ist, mit der das betreffende Ende (5a) des Gießrohres (5) auf die Gießdüse aufgeschoben werden soll.
3. Gießrohr nach Anspruch 1 oder 2, hergestellt durch Gießen in eine Form, dadurch gekennzeichnet, daß der Ring (8, 9, 11, 12, 13, 14) aus feuerfestem Werkstoff an dem Werkstoff der Wand (7) des Gießrohres (5) während dessen Gießens befestigt ist.
4. Gießrohr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Dicke der Wand des feuerfesten Ringes (8, 9, 11) etwa gleich der Dicke der Wand (7) ist, und daß die Innenfläche und die Außenfläche des Ringes etwa in der Verlängerung der Innenfläche und der Außenfläche der Wand (7) des Gießrohres liegen.
5. Geißrohr nach Anspruch 4, dadurch gekennzeichnet, daß die Berührungsfläche zwischen dem feuerfesten Ring (9) und der Wand (7) des Gießrohres wenig-stens eine ringförmige Stufe oder Schulter (10) hat.
6. Gießrohr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Dicke des feuerfesten Ringes (11) kleiner als diejenige der Wand (7) des Gießrohres ist, und daß die Innenfläche (11 a) dieses Ringes etwa in der Verlängerung der Innenfläche (7a) des Gießrohres liegt.
7. Gießrohr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Innendurchmesser des feuerfesten Ringes (12, 13) kleiner als der Innendurchmesser des Gießrohres ist.
8. Gießrohr nach Anspruch 7, dadurch gekennzeichnet, daß die Außenfläche (12a) des Ringes (12) in der Verlängerung der Innenfläche (7a) des Rohres liegt.
9. Gießrohr nach Anspruch 7, dadurch gekennzeichnet, daß der Außendurchmesser des feuerfesten Ringes (13) größer als der Innendurchmesser des Gießrohres ist, und daß dieser Ring zu einem Teil in eine Ringschluter (13a) in der Wand (7) des Gießrohres eingepaßt ist.
10. Gießrohr nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der feuerfeste Ring (14) im oberen Teil seiner Innenfläche eine ringförmige Erweiterung (14a) zur Aufnahme des freien Endes der Gießdüse (3) hat.
11. Gießrohr nach einem der Ansprüche 1 bis 10, wobei ihr von der Gießdüse (3) des ersten Schmelzbehälters (1) abgewandtes Ende zum Eintauchen in das in den zweiten Schmelzebehälter (4) gegossene flüssige Metall (17) bestimmt ist, dadurch gekennzeichnet, daß dieses Ende des Gießrohres ebenfalls mit einem feuerfesten Ring (16) versehen ist.
12. Gießrohr nach Anspruch 11, dadurch gekennzeichnet, daß die Höhe des Ringes (16) wenigstens gleich der Eintauchtiefe des Gießrohres (5) in das flüssige Metall (17) in dem zweiten Schmelzebehälter (4) ist.
13. Gießrohr nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Dicke des Ringes (16) etwa gleich der Dicke der Wand (7) des Gießrohres (5) ist.
14. Gießrohr nach einem der Ansprüche 1 bis 13, mit einem äußeren schützenden Mantelblech, dadurch gekennzeichnet, daß dieses Mantelblech einen nach außen weisenden Ringwulst (22) hat, der einen ringförmigen Hohraum (23) zwischen diesem Mantelblech und der Innenwand (7) des Gießrohres begrenzt, welcher Hohlraum in Verbindung mit einem Rohr (28) steht, das mit einer nicht-oxydierendes oder inertes Gas liefernden Gasquelle verbunden ist.
15. Gießrohr nach Anspruch 14, dadurch gekennzeichnet, daß der ringförmige Wulst (18) in der Nachbarschaft des feuerfesten Ringes (8) angeordnet ist.
16. Gießrohr nach Anspruch 14 oder 15, dadurch gekennzeichnet, daß das Mantelblech (6) in seinem oberen Bereich einen ringförmigen Wulst hat, der aus dem eingerollten Rand (26) des Mantelbleches besteht und sich auf das angrenzende Ende der Wand (7) des Gießrohres abstützt sowie in seinen Inneren einen Ringkanal enthält, dermit einem Zuleitungsrohr (28) für inertes Gas verbunden ist, wobei der eingerollte Rande (26) eine Anzahl von radial auf die Achse des Gießrohres gerichteten Öffnungen (27) hat.
EP80902236A 1980-11-26 1980-11-26 Thermisch isolierendes giessrohr für metallurgisches gefäss Expired EP0065514B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80902236T ATE13829T1 (de) 1980-11-26 1980-11-26 Thermisch isolierendes giessrohr fuer metallurgisches gefaess.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1980/000169 WO1982001836A1 (en) 1980-11-26 1980-11-26 Thermally insulating casting tube for metallurgic container

Publications (2)

Publication Number Publication Date
EP0065514A1 EP0065514A1 (de) 1982-12-01
EP0065514B1 true EP0065514B1 (de) 1985-06-19

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EP80902236A Expired EP0065514B1 (de) 1980-11-26 1980-11-26 Thermisch isolierendes giessrohr für metallurgisches gefäss

Country Status (10)

Country Link
US (1) US4660808A (de)
EP (1) EP0065514B1 (de)
AT (1) ATE13829T1 (de)
AU (1) AU544222B2 (de)
CA (1) CA1183325A (de)
DE (2) DE65514T1 (de)
ES (1) ES8301131A1 (de)
MX (1) MX157119A (de)
WO (1) WO1982001836A1 (de)
ZA (1) ZA817593B (de)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
FR2516415A1 (fr) * 1981-11-13 1983-05-20 Daussan & Co Dispositif pour eliminer les inclusions contenues dans les metaux liquides
DE3226047C2 (de) * 1982-07-12 1985-11-28 Didier-Werke Ag, 6200 Wiesbaden Verbindung zwischen dem Auslaufkonus des Verschlusses eines Gießgefäßes für Metallschmelze und dem daran anschließenden Schutzrohr
GB8422486D0 (en) * 1984-09-06 1984-10-10 Foseco Trading Ag Pouring tubes
US4756452A (en) * 1986-11-13 1988-07-12 Shinagawa Refractories Co., Ltd. Molten metal pouring nozzle
US4951929A (en) * 1989-04-06 1990-08-28 Didier-Taylor Refractories Corporation Refractory assembly including inner and outer refractory members with interference shrink fit therebetween and method of formation thereof
US5118016A (en) * 1990-09-27 1992-06-02 Martin & Pagenstecher, Inc. Bottom pour tiles with self sealing joint for pouring liquid steel
FR2757431B1 (fr) * 1996-12-20 1999-02-12 Vesuvius France Sa Installation de transfert de metal liquide, procede de mise en oeuvre, et refractaires
ATE202021T1 (de) * 1996-10-17 2001-06-15 Vesuvius Crucible Co Feuerfeste anordnungen
WO2005046457A2 (en) * 2003-11-05 2005-05-26 Texas Scottish Rite Hospital For Children A biomimetic biosynthetic nerve implant
DE102009052279A1 (de) * 2009-11-09 2011-06-01 Lwb Refractories Gmbh Kohlenstoffhaltiges feuerfestes Material zur Verwendung beim Vergießen von Stahl im Untergussverfahren und daraus hergestellte Formkörper
DE102017109448A1 (de) * 2017-05-03 2018-11-08 EKW Gesellschaft mit beschränkter Haftung Gießdüse mit auswechselbarer Krone

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
CH387883A (de) * 1959-10-13 1965-02-15 Beteiligungs & Patentverw Gmbh Giessvorrichtung
FR1493389A (fr) * 1966-09-22 1967-08-25 United States Steel Corp Appareil pour la coulée continue de métaux
GB1215330A (en) * 1967-01-20 1970-12-09 Stoecker & Kunz Gmbh Improvements relating to casting ladles provided with teeming nozzles
DE1958192U (de) * 1967-01-20 1967-04-06 Stoecker & Kunz G M B H Giesspfannenausguss, insbesondere fuer das stranggiessen.
FR2333599A1 (fr) * 1975-12-02 1977-07-01 Daussan Henri Dispositif a element tubulaire pour la coulee des metaux fondus
FR2433995A1 (fr) * 1978-08-24 1980-03-21 Daussan & Co Procede et dispositif pour deboucher l'orifice de coulee d'un recipient metallurgique
DE2919880C2 (de) * 1979-05-17 1983-10-13 Didier-Werke Ag, 6200 Wiesbaden Feuerfestes Gießrohr zwischen Gießpfanne und Zwischenbehältern von Stranggießanlagen

Also Published As

Publication number Publication date
ES507420A0 (es) 1982-11-16
ATE13829T1 (de) 1985-07-15
US4660808A (en) 1987-04-28
AU544222B2 (en) 1985-05-23
CA1183325A (en) 1985-03-05
AU7717281A (en) 1982-06-03
MX157119A (es) 1988-10-28
DE65514T1 (de) 1983-04-28
DE3070789D1 (en) 1985-08-01
ZA817593B (en) 1982-12-29
ES8301131A1 (es) 1982-11-16
WO1982001836A1 (en) 1982-06-10
EP0065514A1 (de) 1982-12-01

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