WO1980000546A1 - Procede d'ouverture de la buse d'une cuve refractaire dans la coulee continue de l'acier - Google Patents

Procede d'ouverture de la buse d'une cuve refractaire dans la coulee continue de l'acier Download PDF

Info

Publication number
WO1980000546A1
WO1980000546A1 PCT/SE1979/000189 SE7900189W WO8000546A1 WO 1980000546 A1 WO1980000546 A1 WO 1980000546A1 SE 7900189 W SE7900189 W SE 7900189W WO 8000546 A1 WO8000546 A1 WO 8000546A1
Authority
WO
WIPO (PCT)
Prior art keywords
lid
steel
nozzle
tundish
opening
Prior art date
Application number
PCT/SE1979/000189
Other languages
English (en)
Inventor
S Saxena
Original Assignee
Ssab Svenskt Stal Ab
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
Priority claimed from SE7809748A external-priority patent/SE7809748L/xx
Application filed by Ssab Svenskt Stal Ab filed Critical Ssab Svenskt Stal Ab
Publication of WO1980000546A1 publication Critical patent/WO1980000546A1/fr

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
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/48—Meltable closures

Definitions

  • the present invention concerns a method for open ⁇ ing the tundish nozzle in the continuous casting of steel
  • the pouring stream between the tundish and the mould is substantially kept constant. In practice this is achiev-. ed by maintaining a constant level of the molten metal in the tundish. Problems with keeping the pouring stream constant arise in the first place in the starting moment when steel is poured from a ladle into the tundish and before the desired level is obtained in the tundish.
  • a common technique is to keep the tundish nozzle closed until a certain level is obtained in the tundish, after which the tundish nozzle is opened. At the present there exists no well established and acceptable technique for this opening of the tundish nozzle.
  • each plant has its own method; which is developed to give a fairly satisfactory result.
  • a generally known technique is that the tundish nozzle is first sealed with a mixture of asbestos and lead, which during the feeding of molten steel successively melts and evaporates, by which the tundish nozzle is opened. The method is of course very dangerous for the environment, as asbestos and lead vapour are toxic.
  • Another technique is to close the nozzle with a cover of steel before supplying the molten metal, where ⁇ upon the nozzle is opened by blowing oxygen gas on the cover. Even this technique, however, involves a number of problems. During the intensive treatment with oxygen gas necessary to burn-up the steel cover there a often also attacks and burning on the very nozzle materi ⁇ al, by which the pouring stream becomes irregular.
  • this phenomenon can be so serious, that the. pouring must be interrupted.
  • this technique can further result in increased clogging tendencies in the nozzle, and may to a certain extent also influence the oxide inclusions in the steel. Besides, the method pollutes the environment.
  • the present invention thus has the aim to bring about a new procedure for opening the tundish nozzle in the continuous casting of steel.
  • the technique according to the invention concerns the use of a material that is
  • Such a material is chosen for the sealing of the tundish nozzle which has a melting point exceeding the temperature of the molten steel.
  • the materials to be preferred for sealing the nozzle are graphite or silicon or a combination . of these.
  • An additional advantage of using silicon is that its
  • OMPI ' - VIF ' 0 graphite and silicon can be used, preferably containing as a minimum 50 weight percent graphite.
  • Graphite powder and silicon powder can be mixed and pressed to form a lid. 5 If it should be necessary to speed up the dissolut ⁇ ion of the cover, this can be done by the addition of an oxygen- containing gas, e.g. pure oxygen.
  • an oxygen- containing gas e.g. pure oxygen.
  • the sealing lid can be protected by covering it with a metallic cone, e.g. of steel, or by covering it with another material, such
  • the sealing lid can suitably be fastened on to the nozzle with a binder, such as sodium silicate, possibly in combination with graphite powder.
  • a binder such as sodium silicate, possibly in combination with graphite powder.
  • the sealing lid can be given various shapes, such as a disc-shaped plate or
  • the opening of the nozzle is usually divided in a more or less conical upper portion and a more or less cylindrical lower portion. It is suitable to place the nozzle lid either fairly high in the conical portion,
  • Fig. 2 shows a corresponding section of a modified design.
  • Example 1 A experiment was made with a device as shown in Fig. 1.
  • the tundish is generally indicated 1 and in the bottom of the tundish there is a conventional nozzle 3 with an opening 5 for the steel to be cast.
  • a graphite lid 7 On the top of the nozzle a graphite lid 7 is arranged, having 90 mm diameter and 6 mm thickness.
  • the lid was fixed on the nozzle with.highly viscous water glass, whereas the sealing between the nozzle and the graphite lid was made with a mixture of graphite powder and water glass to prevent the penetration of steel.
  • the tundish with its nozzle and the sealing arrange ment was now preheated for about 2 hours.
  • the nozzle was heated from below for about 20 minutes.
  • the steel start ⁇ ed to run out through the nozzle about 30 to 40 seconds after filling the tundish with molten steel.
  • After a short time the whole pouring outlet 5 opened and the steel ran with full speed.
  • the influence of the graphite lid on the carbon content of the steel castings turned out to be insignificant.
  • Example 1 The experiment according to Example 1 was repeated but this time using a . silicon-carbide lid for sealing the tundish nozzle.
  • the device functioned as satisfact- orily as in Example 1, but due to the exothermal re ⁇ action by dissolving the silicon content of the lid the advantage of easier outflow of the steel was obtained during the opening phase.

Landscapes

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

Abstract

Procede pour l'ouverture de la buse d'une cuve refractaire dans la coulee continue de l'acier, dans lequel la buse de cuve refractaire (3) est premierement scellee avec un couvercle constitue de graphite, silicium ou une combinaison de ceux-ci qui se dissolvent dans le metal fondu.
PCT/SE1979/000189 1978-09-15 1979-09-13 Procede d'ouverture de la buse d'une cuve refractaire dans la coulee continue de l'acier WO1980000546A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7809748A SE7809748L (fr) 1978-09-15
SE7809748 1978-09-15

Publications (1)

Publication Number Publication Date
WO1980000546A1 true WO1980000546A1 (fr) 1980-04-03

Family

ID=20335846

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1979/000189 WO1980000546A1 (fr) 1978-09-15 1979-09-13 Procede d'ouverture de la buse d'une cuve refractaire dans la coulee continue de l'acier

Country Status (1)

Country Link
WO (1) WO1980000546A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080087A1 (fr) * 1981-11-21 1983-06-01 Mannesmann Rexroth GmbH Dispositif pour empêcher l'écoulement des impuretés ensemble avec le matériau fondu
US4522322A (en) * 1982-03-31 1985-06-11 Elektro-Thermit Gmbh Self-opening closure for a casting crucible used in aluminothermic reactions
US4741463A (en) * 1982-12-03 1988-05-03 Chamotte- Und Tonwerk Kurt Hagenburger Ingate device and process for casting molten metals
US5332416A (en) * 1992-04-23 1994-07-26 Allegheny Ludlum Corporation Method for separating slag and nonmetallic particles during molten metal teeming operations using meltable dam
US5718415A (en) * 1994-09-10 1998-02-17 Foseco International Limited Flow control device for the outlet nozzle of a metallurgical vessel
EP0914889A1 (fr) * 1997-10-31 1999-05-12 Elektro-Thermit GmbH Bouchon auto-ouvrant pour un creuset

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US673556A (en) * 1899-09-15 1901-05-07 John M Hartman Iron notch for blast-furnaces and means for plugging same.
US2563131A (en) * 1951-08-07 Tapping blast furnaces and the like
FR1309582A (fr) * 1961-04-01 1962-11-16 Huettenwerk Oberhausen Ag Dispositif de fermeture pour poches de coulée et mode d'utilisation
DE2249668A1 (de) * 1971-10-12 1973-04-19 Foseco Int Stopfen fuer giesswannen
CH537226A (de) * 1971-09-27 1973-05-31 Concast Ag Verfahren und Vorrichtung zum Öffnen eines unbetätigbaren Verschlusskörpers des Bodenausgusses eines Giessgefässes
DE2653213A1 (de) * 1976-10-14 1978-04-20 Daussan Et Compagnie S A Vorrichtung zur vorwaermung von mit verschlussgliedern versehenen zwischenkannen
SE402410B (sv) * 1973-11-16 1978-07-03 Stopinc Ag Bottentillslutning for utloppet i ett metallurgiskt kerl

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563131A (en) * 1951-08-07 Tapping blast furnaces and the like
US673556A (en) * 1899-09-15 1901-05-07 John M Hartman Iron notch for blast-furnaces and means for plugging same.
FR1309582A (fr) * 1961-04-01 1962-11-16 Huettenwerk Oberhausen Ag Dispositif de fermeture pour poches de coulée et mode d'utilisation
CH537226A (de) * 1971-09-27 1973-05-31 Concast Ag Verfahren und Vorrichtung zum Öffnen eines unbetätigbaren Verschlusskörpers des Bodenausgusses eines Giessgefässes
DE2249668A1 (de) * 1971-10-12 1973-04-19 Foseco Int Stopfen fuer giesswannen
SE402410B (sv) * 1973-11-16 1978-07-03 Stopinc Ag Bottentillslutning for utloppet i ett metallurgiskt kerl
DE2653213A1 (de) * 1976-10-14 1978-04-20 Daussan Et Compagnie S A Vorrichtung zur vorwaermung von mit verschlussgliedern versehenen zwischenkannen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080087A1 (fr) * 1981-11-21 1983-06-01 Mannesmann Rexroth GmbH Dispositif pour empêcher l'écoulement des impuretés ensemble avec le matériau fondu
US4522322A (en) * 1982-03-31 1985-06-11 Elektro-Thermit Gmbh Self-opening closure for a casting crucible used in aluminothermic reactions
US4741463A (en) * 1982-12-03 1988-05-03 Chamotte- Und Tonwerk Kurt Hagenburger Ingate device and process for casting molten metals
US5332416A (en) * 1992-04-23 1994-07-26 Allegheny Ludlum Corporation Method for separating slag and nonmetallic particles during molten metal teeming operations using meltable dam
US5718415A (en) * 1994-09-10 1998-02-17 Foseco International Limited Flow control device for the outlet nozzle of a metallurgical vessel
EP0914889A1 (fr) * 1997-10-31 1999-05-12 Elektro-Thermit GmbH Bouchon auto-ouvrant pour un creuset
US6120726A (en) * 1997-10-31 2000-09-19 Elektro-Thermit Gmbh Automatic tapping thimble

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