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WO2007085465A1 - Buse pour le transfert de metal en fusion - Google Patents

Buse pour le transfert de metal en fusion Download PDF

Info

Publication number
WO2007085465A1
WO2007085465A1 PCT/EP2007/000668 EP2007000668W WO2007085465A1 WO 2007085465 A1 WO2007085465 A1 WO 2007085465A1 EP 2007000668 W EP2007000668 W EP 2007000668W WO 2007085465 A1 WO2007085465 A1 WO 2007085465A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
gas
discharge element
layer
gas discharge
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.)
Ceased
Application number
PCT/EP2007/000668
Other languages
English (en)
Inventor
Philippe Guillo
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.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
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 Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Publication of WO2007085465A1 publication Critical patent/WO2007085465A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • Nozzle for the transfer of molten metal Nozzle for the transfer of molten metal.
  • the invention relates to a nozzle for use in the casting of molten metal from an upper vessel to a lower vessel.
  • Refractory articles for controlling a flow of molten metal such as steel
  • Such articles include nozzles, slide gate plates and shrouds, and are often used in combination to modulate a flow of liquid steel during the casting of molten metal.
  • aluminum-killed steels became one of the most common products of the steel making industry due to its desirable metallurgical properties.
  • metal oxides such as alumina
  • Contacting surfaces include, for example, the bore and top surface of a nozzle. Oxide deposits in the bore can ultimately cause the complete blockage of the nozzle.
  • deposits at the top surface can prevent shut- off of the molten steel stream because a stopper rod can no longer sealingly engage the top surface of the nozzle.
  • alumina deposits form when oxygen reacts with constituents in the nozzle and the molten steel. Shielding the molten steel from oxygen effectively reduces unwanted deposits. Shielding may be accomplished by injecting an overpressure of inert gas, such as argon, into the refractories surrounding the molten steel. Injection reduces the partial pressure of oxygen available to cause clogging
  • Reactive gases may also be employed when the melt composition needs modifying.
  • the nozzle - generally made from an alumina carbon refractory composition - is provided with a gas inlet connected to gas supply means on the one end and, through a bore, to a gas discharge element at the other end.
  • the gas discharge element can be arranged inside the nozzle (i.e. in a contacting surface of the nozzle) or at an end thereof and is generally comprised of a porous refractory element.
  • the gas discharge element is constituted of a material which will not produce carbon monoxide at the temperature of use.
  • the gas discharge element generally constituted of a porous refractory element through which the gas diffuses
  • the nozzle can be formed by copressing the material constituting the gas discharge element with the material forming the nozzle body. Alternatively, the gas discharge element can be inserted pre-pressed into the pressing mold before pressing the nozzle.
  • the layer can be formed as a coating applied on the walls of the gas passageway after the manufacture of the nozzle. Such a coating can be applied by pouring a liquid, wet or semi- wet composition or simply by filling the bore with the appropriate composition. Once the coating is dried, the nozzle can then be cured. Alternatively, the curing of the nozzle can take place before the coating step.
  • the layer is a liner pressed simultaneously with the nozzle. Such a layer can be produced for example according to the method disclosed in the document EP-B1 -1071530. In this case, it is indeed possible to reduce the number of manufacturing steps.
  • the gas discharge element extends through essentially the whole thickness of the nozzle body.
  • the material constituting the gas discharge element and layer which will not produce carbon monoxide at the temperature of use can be selected from three different categories of materials: a) materials which do not contain carbon; b) materials essentially constituted of non reducible refractory oxides; or c) materials comprising elements which will react with the generated carbon monoxide.
  • the selected material will present two or three of the above properties.
  • the material of the layer and of the gas discharge element can be the same or different.
  • E ⁇ xamples of suitable material of the first category are silica (for example vitreous silica), alumina, mullite or magnesia based material (spinel). In certain cases, these materials can however be somehow difficult to apply as a liner or coating (the lack of carbon in the layer can cause some thermal shock problems) and do not constitute the preferred embodiment of the invention.
  • Suitable materials of the second category are for example pure alumina carbon compositions.
  • these compositions should contain very low amount of silica or of conventional impurities which are usually found in silica (sodium or potassium oxide).
  • the silica and its conventional impurities should be kept under 2 wt. %, preferably under 1 wt. %.
  • Suitable materials of the third category comprises for example free metal able to combine with carbon monoxide to form a metal oxide and free carbon.
  • Silicon and aluminum are suitable for this application. These materials can also or alternatively comprise carbides or nitrides able to react with carbon monoxide (for example silicon or boron carbides).
  • the selected material will belong to the second or third categories, even preferably, it will belong to the second and third category.
  • a suitable material constituting the gas discharge element and the layer which will not produce carbon monoxide at the temperature of use can comprise 60 to 88 wt. % of alumina, 10 to 20 wt. % graphite and 1 to 10 wt. % of silicon carbide.
  • Such a material is essentially constituted of non-oxides species or non-reducible oxides and comprises silicon carbide which can react with the carbon monoxide if some is generated in working condition.
  • reference 1 depicts a nozzle for use in the casting of molten metal.
  • the nozzle comprises a nozzle body having a gas discharge element 2 and a gas inlet 4 connected together through a bore 3.
  • the gas inlet 4 is connected to an external gas source (not shown) through appropriate connecting means.
  • the connector disclosed in the document W0-A1 -2004069451 for example is suitable for this application.
  • the gas discharge element is constituted of a material which will not produce carbon monoxide at the temperature of use.
  • the bore 3 defines a gas passageway. The walls of the bore 3 are provided with a layer 5 which will not produce carbon monoxide at the temperature of use.
  • Fig.1 shows an inner nozzle in which the gas discharge element 2 is comprised of a refractory porous element constituted of a material that will not produce carbon monoxide at the temperature of use.
  • the layer 5 which does not produce carbon monoxide at the temperature of use is formed as a coating applied on the walls of the bore 3 after the manufacture of the nozzle but before curing.
  • Fig.2 shows a submerge entry nozzle 1 (SEN).
  • the porous gas discharge element 2 which is constituted of a material that will not produce carbon monoxide at the temperature of use is fed with gas through a bore 3 connected to a gas inlet 4.
  • the walls of the bore 3 up to the gas inlet 4 are provide with a layer 5 which does not produce carbon monoxide at the temperature of use.
  • the layer 5 has been produced by wrapping a layer of material according to the method disclosed in EP-B1 -1 ,071 ,530 around an element that will disappear during firing of the nozzle (such as a wax rod for example) before copressing the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L'invention concerne une buse (1) prévue pour le transfert de métal en fusion d'un récipient supérieur à un récipient inférieur, comportant un corps de buse muni d'un élément de refoulement de gaz et d'un alésage (3) reliant l'élément (2) de refoulement de gaz à une entrée (4) de gaz, l'alésage (3) définissant un passage de gaz. Selon l'invention, l'élément (2) de refoulement de gaz est constitué d'un matériau ne produisant pas de monoxyde de carbone à la température d'utilisation. Avantageusement, les parois du passage de gaz sont pourvues d'une couche (5) d'un matériau ne produisant pas de monoxyde de carbone à la température d'utilisation. La buse de l'invention ne contamine pas le gaz qui la traverse.
PCT/EP2007/000668 2006-01-26 2007-01-26 Buse pour le transfert de metal en fusion Ceased WO2007085465A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06100906.4 2006-01-26
EP06100906 2006-01-26

Publications (1)

Publication Number Publication Date
WO2007085465A1 true WO2007085465A1 (fr) 2007-08-02

Family

ID=36602603

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/000668 Ceased WO2007085465A1 (fr) 2006-01-26 2007-01-26 Buse pour le transfert de metal en fusion

Country Status (3)

Country Link
AR (1) AR059108A1 (fr)
TW (1) TW200744772A (fr)
WO (1) WO2007085465A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503316A2 (fr) * 1991-03-11 1992-09-16 Vesuvius Crucible Company Compositions réfractaires résistant à l'érosion, au choc thermique et à l'oxydation
EP0589762B1 (fr) * 1992-09-21 1999-05-19 Sollac Busette de coulée de métal et procédés de fabrication de cette busette
EP1071530B1 (fr) * 1998-03-31 2002-09-11 Vesuvius Crucible Company Article en ceramique resistant au choc thermique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503316A2 (fr) * 1991-03-11 1992-09-16 Vesuvius Crucible Company Compositions réfractaires résistant à l'érosion, au choc thermique et à l'oxydation
EP0589762B1 (fr) * 1992-09-21 1999-05-19 Sollac Busette de coulée de métal et procédés de fabrication de cette busette
EP1071530B1 (fr) * 1998-03-31 2002-09-11 Vesuvius Crucible Company Article en ceramique resistant au choc thermique

Also Published As

Publication number Publication date
AR059108A1 (es) 2008-03-12
TW200744772A (en) 2007-12-16

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