EP0990474B1 - Inertgasabschirmvorrichtung für Kokillen zum Stranggiessen von Metall - Google Patents

Inertgasabschirmvorrichtung für Kokillen zum Stranggiessen von Metall Download PDF

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Publication number
EP0990474B1
EP0990474B1 EP99402209A EP99402209A EP0990474B1 EP 0990474 B1 EP0990474 B1 EP 0990474B1 EP 99402209 A EP99402209 A EP 99402209A EP 99402209 A EP99402209 A EP 99402209A EP 0990474 B1 EP0990474 B1 EP 0990474B1
Authority
EP
European Patent Office
Prior art keywords
membrane
mould
gas
mold
liquid metal
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
EP99402209A
Other languages
English (en)
French (fr)
Other versions
EP0990474A1 (de
Inventor
Eric Perrin
Cosimo Salaris
Edouard Weisseldinger
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.)
Ugine-Savoie Imphy En Sollac En SA
Forges et Acieries de Dilling SA
Sollac SA
Ugitech SA
Original Assignee
Forges et Acieries de Dilling SA
Ascometal SA
Sollac SA
Ugine Savoie Imphy 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 Forges et Acieries de Dilling SA, Ascometal SA, Sollac SA, Ugine Savoie Imphy SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Forges et Acieries de Dilling SA
Publication of EP0990474A1 publication Critical patent/EP0990474A1/de
Application granted granted Critical
Publication of EP0990474B1 publication Critical patent/EP0990474B1/de
Anticipated expiration legal-status Critical
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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
    • B22D11/106—Shielding the molten jet
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds

Definitions

  • the invention relates to the continuous casting of metals such as steel. More specifically, it relates to devices ensuring the protection of the liquid metal present in the mold against possible chemical reactions with ambient air.
  • Continuous steel casting facilities include an ingot mold without bottom, the walls of which are energetically cooled internally by circulation of water, and are made of a metal that is a good conductor of heat such as copper or its alloys.
  • the liquid steel is continuously introduced into the ingot mold, coming from a container called “distributor” which overhangs it, and it begins its solidification by forming a solid crust against the internal walls of the mold.
  • the product (called slab, bloom or billet according to its shape and dimensions) is continuously extracted from the mold and completes its solidification at heart outside the mold, thanks to an external cooling by spraying water.
  • Liquid steel entering the ingot mold must be protected from ambient air, in order to avoid an increase in its nitrogen content and the formation of oxidized inclusions within it.
  • the jet of liquid metal flowing from the distributor is most often protected by a tube of refractory material whose lower end plunges into the bath metallic present in the mold.
  • cover powder usually the free surface of the liquid steel present in the mold is covered by an oxide-based powder, called "cover powder". Its functions are multiple. Besides the protection of steel against ambient air, it stops the radiation from the surface, and thus reduces the metal heat losses. And by infiltrating between the solidified crust and the mold, it provides lubrication of the mold-product interface which allows the extraction of product is produced without risk of tearing of the solidified crust. This extraction is also facilitated by vertical oscillations, and possibly also vibrations ultrasonic printed in the mold.
  • Burning the oil reduces the oxygen content of the ambient atmosphere, but it can only imperfectly protect the metal against reoxidation.
  • This action must then be supplemented by gaseous inerting of the surface environment metal.
  • This inerting is conventionally carried out by insufflation of argon (or nitrogen for casting grades which tolerate high levels of this element) around the jet and on the free surface of the liquid metal.
  • argon or nitrogen for casting grades which tolerate high levels of this element
  • the object of the invention is to propose a device for inerting the environment of the surface of the liquid metal bath in an ingot mold more efficient than the devices existing.
  • the invention relates to a space inerting device surrounding the free surface of the molten metal poured into a continuous casting mold metals located under a distributor, according to claim 1.
  • the invention consists in interposing between the bottom of the distributor and the upper edge of the mold an annular seal which is inflated by a gas under pressure. It is made of a material resistant to heat and sufficiently permeable gas (preferably due to its natural porosity) so that gas leaking from the joint come fill the space delimited by the gasket, the bottom of the distributor and the upper edge of the ingot mold, and in which are the pouring jet and the free surface of the liquid metal poured into the mold.
  • This seal is fixed to the bottom of the distributor or to the upper edge of the ingot mold, and must, once inflated, have a thickness such that it is sufficient to fill the space separating the distributor and the ingot mold when this space has its width maximum (i.e. when the mold, during its oscillation cycle, is in its lowest position).
  • the single figure shows schematically the upper part of an installation continuous casting of steel billets.
  • a distributor 1 containing liquid steel 2, and of which only the bottom 3 is shown.
  • the bottom 3 has a calibrated nozzle 4 through which the liquid steel 2 flows to form a pouring jet 5.
  • This enters the interior space of a bottomless ingot mold 6 whose walls 7, 8, 9 are energetically cooled internally by water circulating in non-ducts represented.
  • the liquid steel 2 present in the mold 6 gradually solidifies against the walls 7, 8, 9 to form the outer crust 10 of a cast product 11 which is extract from the mold 6 by known means not shown.
  • the product 11 is sprayed with water through nozzles 12, 13, 14, 15 to accelerate its cooling.
  • a layer of lubricating oil 16 covers the surface 17 of the steel liquid 2 present in the ingot mold 6. This is driven by an oscillating movement vertical according to arrow 18, by known means not shown.
  • the amplitude of these oscillations can be of the order of a few mm to a few cm, and their frequency of in the order of a few Hz.
  • Oil can also, in known manner, be supplied in various points of the wall interface 7, 8, 9-crust 10 by orifices (not shown) formed in the walls 7, 8, 9.
  • the felt is in the form of a commercial strip which is rolled up to form a tube which is closed according to a generator by sewing or gluing, then which is closed on itself to form a ring.
  • the membrane 19 can be coated, on its portion facing the outside of the space 27, by a gas-tight material, so that all the gas leaving the membrane 19 is effectively introduced into the space 27.
  • the plate 25 can also be given a relatively thick important and integrate a transparent window, through which we can have access visual on the surface 17 of the liquid metal 2 in an ingot mold, so as to make it possible the use of a device for regulating the level of this surface 17 of a type comprising a camera or any other device requiring optical access to the surface 17.
  • Another variant would be to fix the plate 25 either on the bottom 3 of the distributor 1, but on the upper edge 26 of the mold 6.
  • the plate 25 is only one example of a means of fixing the membrane 19, and any other type of fixing means which can play the same function is usable.
  • the device according to the invention in addition to its effectiveness for protecting the metal liquid, has the advantages of ease of installation and use. In particular, it is very tolerant of slight variations in height positioning of the distributor 1 (a few mm) that can usually be encountered.
  • the device according to the invention can also be used on installations for casting which include, instead of an oscillating ingot mold, an ingot mold to which prints low amplitude and high frequency movements using transmitters ultrasonic, as well as molds on which such movements are superimposed on classic oscillations. It is also applicable in the case of ingot molds which are extended upwards by an extension of refractory material inside which maintains the surface of the liquid steel.
  • the device according to the invention can also be used in the case where the casting jet 5 is itself protected by a tube of refractory material. It is applicable to the casting of products of all formats. Likewise, it is applicable to continuous casting other metals than steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (4)

  1. Vorrichtung zur Inertisierung des die freie Oberfläche eines in eine Kokille zum Stranggießen von Metall gegossenen flüssigen Metalls umgebenden Raums, wobei die Kokille unter einem Verteiler angeordnet ist, aus dem ein die Kokille speisender Gießstrahl ausströmt, welche Vorrichtung eine aus einem gasdurchlässigen, flexiblen, feuerfesten Material gefertigte Ringmembran aufweist, die mit einem röhrenförmigen Halterahmen verbunden ist, welcher Mittel zur Befestigung der Membran in einer Position aufweist, in der sie den Gießstrahl umgibt, und mit einem Stutzen zur Einspeisung eines Inertisierungsgases in ihr Inneres sowie Austrittsöffnungen versehen ist, durch welche das Gas im Innern der Membran ausströmt, und dadurch gekennzeichnet ist, dass zur Bildung einer flexiblen Ringdichtung, die den oberen Rand (26) der Kokille (6) mit dem Boden (3) des Verteilers (1) verbindet,
    die Membran (19) im gefüllten Zustand eine Dicke aufweist, die größer ist als der maximale Abstand zwischen dem oberen Rand (26) der Kokille (6) und dem Boden (3) des Verteilers (1 ) während des Gießens;
    der röhrenförmige Halterahmen (20) im Innern der Membran (19) gelagert ist;
    und Mittel zum Einblasen des Inertisierungsgases in den Einspeisestutzen (21, 22) vorgesehen sind, die es ermöglichen, das Auffüllen der Membran (19) zu gewährleisten und sie im komprimierten Zustand in dichtem und gleichzeitigem Kontakt mit dem Boden (3) des Verteilers (1) und dem oberen Rand (26) der Kokille (6) zu halten.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Membran (19) aus einem feuerfesten Filz auf Graphitbasis gefertigt ist.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Membran (19) auf ihrem zur Außenseite des die freie Oberfläche (17) des flüssigen Metalls (2) in der Kokille(6) umgebenden Raums (27) gerichteten Abschnitt mit einem gegen das Inertisierungsgas dichten Werkstoff beschichtet ist.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Mittel zur Befestigung der Membran aus einer ringförmigen Platte (25) bestehen, welche ein Fenster aus einem transparenten Werkstoff aufweist, das einen optischen Zugang zur freien Oberfläche (17) des flüssigen Metalls (2) in der Kokille (6) verschafft.
EP99402209A 1998-09-28 1999-09-09 Inertgasabschirmvorrichtung für Kokillen zum Stranggiessen von Metall Expired - Lifetime EP0990474B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9812128A FR2783732B1 (fr) 1998-09-28 1998-09-28 Dispositif d'inertage pour lingotiere de coulee continue des metaux
FR9812128 1998-09-28

Publications (2)

Publication Number Publication Date
EP0990474A1 EP0990474A1 (de) 2000-04-05
EP0990474B1 true EP0990474B1 (de) 2003-12-17

Family

ID=9530940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402209A Expired - Lifetime EP0990474B1 (de) 1998-09-28 1999-09-09 Inertgasabschirmvorrichtung für Kokillen zum Stranggiessen von Metall

Country Status (9)

Country Link
EP (1) EP0990474B1 (de)
JP (1) JP2000176614A (de)
KR (1) KR20000023354A (de)
AT (1) ATE256517T1 (de)
BR (1) BR9904398A (de)
CA (1) CA2284375A1 (de)
DE (1) DE69913631T2 (de)
ES (1) ES2213337T3 (de)
FR (1) FR2783732B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4999627B2 (ja) * 2007-10-04 2012-08-15 日本冶金工業株式会社 溶融合金のシール装置およびこの装置を用いた鋳造方法並びに連続鋳造開始時の断気方法
JP5008516B2 (ja) * 2007-10-10 2012-08-22 日本冶金工業株式会社 溶融合金のシール装置およびこの装置を用いた鋳造方法並びに連続鋳造開始時の断気方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE445983C (de) * 1927-06-21 Siemens Schuckertwerke G M B H Einrichtung zum Abdichten des Gluehraums von Gluehoefen
JPS5072709U (de) * 1973-11-12 1975-06-26
CH660700A5 (de) * 1983-08-12 1987-06-15 Finanz Handels Invest Fhi Abschirmvorrichtung fuer einen giessstrahl aus fluessigem material.
SU1675049A1 (ru) * 1989-03-09 1991-09-07 Научно-производственное объединение по механизации, роботизации труда и совершенствованию ремонтного обеспечения на предприятиях черной металлургии "Черметмеханизация" Устройство дл защиты струи металла от окислени
US5131573A (en) * 1991-03-22 1992-07-21 Allegheny Ludlum Corporation Method and device for shrouding a stream of molten metal

Also Published As

Publication number Publication date
DE69913631T2 (de) 2004-12-23
ATE256517T1 (de) 2004-01-15
FR2783732B1 (fr) 2000-10-27
CA2284375A1 (fr) 2000-03-28
ES2213337T3 (es) 2004-08-16
BR9904398A (pt) 2000-12-26
JP2000176614A (ja) 2000-06-27
EP0990474A1 (de) 2000-04-05
FR2783732A1 (fr) 2000-03-31
DE69913631D1 (de) 2004-01-29
KR20000023354A (ko) 2000-04-25

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