EP0703028B1 - Einrichtung zur Inertgasversorgung einer Düse für ein metallurgisches Gefäss - Google Patents

Einrichtung zur Inertgasversorgung einer Düse für ein metallurgisches Gefäss Download PDF

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Publication number
EP0703028B1
EP0703028B1 EP95402052A EP95402052A EP0703028B1 EP 0703028 B1 EP0703028 B1 EP 0703028B1 EP 95402052 A EP95402052 A EP 95402052A EP 95402052 A EP95402052 A EP 95402052A EP 0703028 B1 EP0703028 B1 EP 0703028B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
internal nozzle
inert gas
internal
accordance
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
EP95402052A
Other languages
English (en)
French (fr)
Other versions
EP0703028A1 (de
Inventor
Patrick Tassot
Pierre Lerouge
Brunello Rosaia
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0703028A1 publication Critical patent/EP0703028A1/de
Application granted granted Critical
Publication of EP0703028B1 publication Critical patent/EP0703028B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/462—Means for handling, e.g. adjusting, changing, coupling
    • 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
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • the subject of the present invention is a inert gas supply device for a nozzle internal for metallurgical vessels for casting by bottom, according to the preamble of claim 1.
  • a device which comprises in the direction of casting of steel, i.e. from the distributor to the ingot mold, an internal nozzle resting on a brick of seat fixed to the bottom of the distributor, a plate of fixed reference with a tap hole, a nozzle external submerged in its lower part in the mold and having in its upper part a flat bearing in base shape for loading and moving of the external nozzle in service.
  • the device also includes means exchange of the external nozzle.
  • the two nozzles which are mounted coaxial define a pouring tube of liquid steel from the distributor to the mold and the inlet of this pouring tube forms the neck of the nozzle internal.
  • a distaff partially submerged in the distributor is positioned in the axis of the pouring tube above the neck of the internal nozzle.
  • This distaff has a larger diameter to the pouring tube.
  • the joint planes between the different elements constituting the pouring tube, namely the internal nozzle, reference plate and nozzle external are possible inputs for air ambient.
  • One of the solutions used so far consists of making the internal nozzle in one piece and the reference plate. This solution allows decrease the number of joints.
  • Another complementary solution is to inject an inert gas, such as argon, in the runner and at the joints between the various parts, in particular between the base of the internal nozzle which serves as a fixed reference plate and the base of the external nozzle.
  • an inert gas such as argon
  • the internal material nozzle refractory is equipped with gas diffusion means inert in the runner and between the base of the internal nozzle and the base of the external nozzle.
  • These means of dissemination include supply ports which are connected to pipes of inert gas supported by the means exchange of the external nozzle.
  • these supply ports open onto the external surface of the internal nozzle at the holes provided in a metal case covering the lower part of the internal nozzle, including the base.
  • metal couplers comprising each with a tapped hole.
  • the ends of the gas supply pipes inert are threaded so that they can be screwed into couplers.
  • the nozzle When assembling the assembly by the internal nozzle, the external nozzle and the means exchange of this external nozzle, the nozzle is fixed internal on the exchange means by precisely adjusting the position of the base of this internal nozzle in wedging means provided in the exchange means or independent of these.
  • the metal case covering the base of the internal nozzle makes positioning easier and more reliable of this internal nozzle.
  • connection of supply pipes inert gas on the supply ports require great skill of operators and can present a risk because some connection areas are not visible and may be subject to improper connections.
  • the means of gas diffusion inert lose their effectiveness which may degrade the cleanliness of the liquid steel and adversely affect the regulation flow at the stopper rod level.
  • the end cap cannot be attached to the end of a connecting pipe with the circuit neutral gas supply since the nozzle must be positioned on the nozzle before setting place of the nozzle itself.
  • the invention aims to remedy these drawbacks by proposing a gas supply device inert of an internal nozzle allowing a automatic connection with gas supply pipes inert and reduce the risk of air infiltration in the sprue.
  • Fig. 1 there is shown schematically part of the bottom of a metallurgical vessel 1 from the bottom.
  • the bottom wall 2 is covered with a internal coating 3 of refractory material.
  • the metallurgical vessel 1 consisting for example of a distributor, is generally arranged an ingot mold, not shown, which is intended to receive the liquid steel coming from the distributor 1.
  • the casting of steel is carried out by a device which comprises, in particular in the direction of casting liquid steel, an internal nozzle 10 made of material refractory bearing on an integral seat brick 4 from the bottom of the distributor 1 and an external nozzle 11 also in refractory material located in the axis of the internal nozzle 10.
  • Internal nozzle 10 and external nozzle 11 constitute a pouring tube of the liquid steel of the distributor 1 to the ingot mold and the inlet of this tube of casting forms the neck 10a of the internal nozzle 10.
  • the external nozzle 11 has at its upper part a base 11a cooperating with a reference plate secured to the nozzle internal 10.
  • the device also includes means for setting the internal nozzle 10 and for exchanging the external nozzle 11, these means being designated by a generally by the reference 30 in FIG. 1.
  • the nozzle internal 10 has a vertical body 15 defining a runner 16 of the liquid steel and, at its part lower, a base 17 serving as a reference plate and the external face of which is covered with a housing metallic 18.
  • This metal case 18 facilitates and makes reliable the positioning of the internal nozzle 10 in the means 30 for wedging this internal nozzle 10 and exchanging the external nozzle 11.
  • the setting of the internal nozzle 10 is produced for example by a piece 35 in the form of a fork which applies said internal nozzle 10 to spans 36.
  • the internal nozzle 10 also includes means of diffusion of an inert gas, such as for example of argon, in the runner 16.
  • an inert gas such as for example of argon
  • inert gas diffusion means are used also to bring this inert gas to the level of the neck 10a of the internal nozzle 10.
  • These inert gas diffusion means are formed for example by a cylindrical ring 19 in porous material disposed in a groove 20 formed in the vertical body 11.
  • the internal wall of the cylindrical ring 19 constitutes a length portion of the runner 16 and the groove 20 is connected to a supply device inert gas.
  • the internal nozzle 10 can also include means for diffusing the inert gas at the level of the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.
  • the neck 10a of the internal nozzle 10 can be also equipped with a cylindrical ring made of material porous, not shown, for diffusing the inert gas to the level of this pass.
  • the inert gas supply device comprises at minus one supply orifice 21 located on the face external of the base 17 and connected to the diffusion means of this inert gas through at least one conduit 22 formed in the refractory material of the internal nozzle 10.
  • the conduit 22 can lead to the level of the groove 20 as shown in FIG. 2 and / or at the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.
  • the metal case 18 has a hole 23.
  • the supply orifice 21 is located on the upper external face of the base 17 of the internal nozzle 10.
  • this supply orifice 21 can also be located on the lateral lateral face of the base 17.
  • the supply port 21 is provided with a sealing washer 24 based on graphite or based of another substance that can crash.
  • the device supply of inert gas also includes minus one connection piece 25 intended to be applied on the sealing washer 24 of the supply port 21.
  • connection end piece 25 is slidably mounted for example in a plate 26 of the wedging means of the internal nozzle 10, these wedging means comprising Exhibit 35.
  • wedging means can be integral means 30 for exchanging the external nozzle 11 or independent of these.
  • connection end piece 25 for example of circular section, has a blind hole 27 which only leads to the lower end of this end cap 25.
  • the blind hole 27 is connected by a pipe 31 and hoses, not shown, at fixed inert gas supply circuit to the factory.
  • connection end piece 25 is provided at its part upper of a cap 28 of diameter greater than diameter of the endpiece 25 to form a stop so preventing this tip from coming out of the plate 26.
  • the diameter of the hole 23 of the metal case 18 is greater than the diameter of the connection piece 25 so as not to interfere with its application on the washer seal 24 arranged on the supply orifice 21.
  • connection end piece 25 To apply the connection end piece 25 to the sealing washer 24 with a given torque which will be always identical, this connection end piece 25 is connected to elastic compression members 29.
  • these elastic members of compression are formed by at least one leaf spring 29 one end of which 29a is supported on the cap 28 of the connection end piece 25 and the other end of which 29b is fixed to the support plate 26 by a known fixation.
  • the elastic compression members can also consist of at least one spring.
  • connection piece 25 has a flat surface and this surface plane 25a (Fig. 3) can be provided with a shoulder annular (Fig. 4) so that the contact between the connection end piece 25 and the sealing washer 24 is carried out according to a generator which reduces the risk of inert gas leakage.
  • connection end piece 25 and the supply orifice 21 can be tapered.
  • connection end piece 25 Considering the significant difference between the contact surface of the lower end of the connection end piece 25 and the contact surface of the supply orifice 21, a very positioning precise of this connector 25 is not necessary to make the junction.
  • connection end piece 25 and the supply orifice 21 are produced at the time of positioning of the internal nozzle 10 in the means of wedging of this internal nozzle which are integral means 30 for exchanging the external nozzle 11 or independent of these means of exchange.
  • the plate 26 with the pipe 31, the nozzle 25 and the elastic compression members 29 form a connection assembly of the fixed supply circuit gas to supply port 21 of the internal nozzle 10.
  • connection assembly is disconnected of part 35. After having installed the nozzle internal 10, the connection assembly previously mentioned is brought into position by horizontal translation in the interval between the distributor 1 and the means timing 30.
  • Lugs located below of the plate 26 and of the cells, not shown, on the remaining part of the part 35 allow for example to refine the positioning and a good plate timing 26.
  • the other end of line 31 can be very easily connected to the fixed supply circuit gas by conventional means.
  • the length of line 31 is determined so that access to its end opposite to the connection end piece 25 does not pose no problem.
  • the elastic compression members 29 allow to apply a given torque always rigorously identical to each junction.
  • the metal case 18 can have a guide groove, not shown, of the connection end piece 25 to the supply port 21.
  • the internal nozzle 10 may include one or several supply ports 21 and the device power supply may include one or more end caps connection 25.
  • the inert gas supply device allows for a connection automatic between the means of diffusion of the inert gas of the internal nozzle with the fixed supply circuits inert gas from the plant.
  • the device according to the invention simplifies the manufacture of the nozzle and the metal housing because it is no longer necessary to provide couplers and thereby significantly decrease the price and the cost of maintenance of these two elements.
  • the device according to the invention is particularly interesting when several orifices are planned. Indeed, the more there are supply ports, plus connection of the assembly of these holes is made easier with the device according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (9)

  1. Einrichtung zur Inertgasversorgung einer inneren Düse (10) aus feuerfestem Material für metallurgische Gefäße (1) zum Gießen nach unten, wobei die innere Düse (10) aufweist:
    einen vertikalen Körper (15) der einen Gießkanal für den in dem metallurgischen Gefäß (1) enthaltenen Stahl begrenzt,
    eine Fußfläche (17) an ihrem unteren Teil, deren Außenfläche von einem metallischen Gehäuse (18) für die Anpassung der inneren Düse (10) in Mitteln zur Einstellung dieser inneren Düse (10) am Boden des metallurgischen Gefäßes (1) bedeckt ist,
    und Diffusionsmitteln (19, 20) für das Inertgas in dem Gießkanal (16) und/oder im Bereich der Schnittstelle zwischen der inneren Düse (10) und einer äußeren Düse (11), die in der Achse der inneren Düse (10) angeordnet ist, wobei diese Mittel (19, 20) mit Gas durch mindestens eine Versorgungsöffnung (21) versorgt werden, die auf der Außenfläche der inneren Düse (10) vorgesehen und mit den Diffusionsmitteln (19) für das Inertgas durch mindestens eine Leitung (22) verbunden ist, die in dem feuerfesten Material der inneren Düse (10) vorgesehen ist, dadurch gekennzeichnet, daß die Einrichtung mindestens ein Anschlußstück (25) umfaßt, das mit Zuführmitteln des Inertgases verbunden ist, von den Mitteln zur Einstellung der inneren Düse (10) getragen wird und dazu bestimmt ist, durch elastische Druckelemente (29) an die Versorgungsöffnung (21), die auf der Außenfläche der Fußplatte (17) vorgesehen ist, angedrückt zu werden.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zur Einstellung der inneren Düse (10) mit Mitteln für den Austausch der äußeren Düse (11) fest verbunden sind.
  3. Einrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das mindestens eine Anschlußstück (25) gleitend auf den Mitteln zur Einstellung der inneren Düse (10) befestigt ist.
  4. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die elastischen Druckelemente (29) von mindestens einem Federblatt gebildet werden.
  5. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die elastischen Druckelemente (29) von mindestens einer Feder gebildet werden.
  6. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das untere Ende des Anschlußstückes (25) eine ebene Fläche umfaßt.
  7. Einrichtung nach den Ansprüchen 1 und 6, dadurch gekennzeichnet, daß das untere Ende des Anschlußstückes (25) einen ringförmigen Ansatz (25a) umfaßt.
  8. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das untere Ende des Anschlußstückes (25) und die Versorgungsöffnung (21) konisch sind.
  9. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das metallische Gehäuse (18) mindestens eine Nut zur Führung des Anschlußstückes (25) zu der Versorgungsöffnung (21) umfaßt.
EP95402052A 1994-09-23 1995-09-11 Einrichtung zur Inertgasversorgung einer Düse für ein metallurgisches Gefäss Expired - Lifetime EP0703028B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411396 1994-09-23
FR9411396A FR2724858A1 (fr) 1994-09-23 1994-09-23 Dispositif d'alimentation en gaz inerte d'une busette interne pour recipients metallurgiques

Publications (2)

Publication Number Publication Date
EP0703028A1 EP0703028A1 (de) 1996-03-27
EP0703028B1 true EP0703028B1 (de) 1999-08-18

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ID=9467229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402052A Expired - Lifetime EP0703028B1 (de) 1994-09-23 1995-09-11 Einrichtung zur Inertgasversorgung einer Düse für ein metallurgisches Gefäss

Country Status (5)

Country Link
EP (1) EP0703028B1 (de)
AT (1) ATE183423T1 (de)
DE (1) DE69511494T2 (de)
ES (1) ES2136260T3 (de)
FR (1) FR2724858A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2548854A1 (de) * 1975-10-31 1977-05-05 Metacon Ag Feuerfester stein mit einer durchlassoeffnung fuer fluessiges metall und verfahren zu dessen herstellung
US4502670A (en) * 1984-02-02 1985-03-05 Allied Corporation Gas hook-up to a ladle
DE3735546A1 (de) * 1987-10-21 1989-05-03 Didier Werke Ag Anordnung zum verbinden eines metallteils mit einem formkoerper aus feuerfestmaterial
DE4223944A1 (de) * 1992-07-21 1994-01-27 Didier Werke Ag Anschlußeinrichtung für eine Gaszuleitung eines Formkörpers aus Feuerfestmaterial

Also Published As

Publication number Publication date
FR2724858B1 (de) 1997-02-07
EP0703028A1 (de) 1996-03-27
DE69511494D1 (de) 1999-09-23
ES2136260T3 (es) 1999-11-16
FR2724858A1 (fr) 1996-03-29
DE69511494T2 (de) 2000-03-23
ATE183423T1 (de) 1999-09-15

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