EP0401988B1 - Vorrichtung zur Halterung und/oder zum Ausgiessen für Behälter für Metallschmelzbäder - Google Patents

Vorrichtung zur Halterung und/oder zum Ausgiessen für Behälter für Metallschmelzbäder Download PDF

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Publication number
EP0401988B1
EP0401988B1 EP90305293A EP90305293A EP0401988B1 EP 0401988 B1 EP0401988 B1 EP 0401988B1 EP 90305293 A EP90305293 A EP 90305293A EP 90305293 A EP90305293 A EP 90305293A EP 0401988 B1 EP0401988 B1 EP 0401988B1
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EP
European Patent Office
Prior art keywords
molten metal
outlet
starting tube
tube
means according
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
EP90305293A
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English (en)
French (fr)
Other versions
EP0401988A2 (de
EP0401988A3 (de
Inventor
Heinrich Comes
Klaus-Dieter Friede
Hubert Krampe
Michael Jünnemann
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.)
Foseco International Ltd
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Foseco International Ltd
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 Foseco International Ltd filed Critical Foseco International Ltd
Priority to AT90305293T priority Critical patent/ATE97598T1/de
Publication of EP0401988A2 publication Critical patent/EP0401988A2/de
Publication of EP0401988A3 publication Critical patent/EP0401988A3/de
Application granted granted Critical
Publication of EP0401988B1 publication Critical patent/EP0401988B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/002—Retaining slag during pouring molten metal by using floating means

Definitions

  • the invention relates to a means for use with a vessel which contains molten metal, i.e. a metal melting bath, e.g. a tank, a ladle, a distribution means, a tundish and the like, and from which vessel the molten metal is to be poured through an outlet.
  • a metal melting bath e.g. a tank, a ladle, a distribution means, a tundish and the like
  • the means are to retain in the vessel, as the molten metal is poured through the outlet, contaminations floating on the surface of the metal.
  • the invention particularly relates to a pouring means for tundishes for receiving molten metal (steel) and for passing it on into ingot moulds or into the mould of a continuous casting plant but is not limited thereto.
  • the steel is passed from a ladle into a tundish, which has outlets in the bottom corresponding to the positions of the moulds.
  • the tundish is either provided with slide gate nozzles from below or with plugs from above, or, in the case of free-runs, with outlet nozzles only.
  • the outlet areas are heated before use by means of burners, from below or from above, in order to avoid chilling during the start-up of casting.
  • the first portion of the steel reaching the tundish and distributing there up to the outlets, is coined by low temperatures and contaminations, which result e.g. from refractory particles from the lining, from sand and from the oxidation of the steel during the start-up of the casting.
  • dams built in for avoiding these problems, which dams were intended to effect a rise of the contaminations due to the damming up of the initial steel and which were also intended to raise the initial casting temperatures due to the high steel volume by mixing the subsequent hot steel with the initially cold steel.
  • This could not prevent the contaminations floating on the surface from reaching the outlets during the starting phase, thus leading, as already described, to a devaluation of the initial steel strand or to difficulties in the starting procedure of casting.
  • filters proposed for use in the outlet were not able to solve these problems due to blockings or difficulties in chilling.
  • CH-A-517542 and FR-A-2224230 are disclosed two means of preventing contaminations passing through the outlet of a molten metal vessel in which the closure is of the vertically-movable stopper rod type. Both means involve the use of an annular sealing means that surrounds the stopper rod and can float on the molten metal in the vessel and presents a barrier to surface contaminants reaching the outlet as the molten metal level falls as it flows out.
  • An object of the present invention is based on the problem of providing means to ensure that the cast strand does not contain contaminations when a starting tube is used.
  • the invention provides means for retaining contaminations contained in molten metal in a vessel, the vessel having an outlet through which the molten metal is poured, in which an annular buoyancy body surrounds the outlet, the body having the shape of a protective ring preventing particles floating on the surface of the molten metal from entering the outlet characterised in that the means comprises a starting tube attached to the outlet, the starting tube having overflow openings for the molten metal, the overflow openings being distributed circumferentially in the upper region of the starting tube so that the molten metal can pour through the outlet only after reaching the overflow openings, wherein the buoyancy body surrounds the starting tube in spaced relationship and floats up the starting tube with rising level of molten metal thereby preventing particles floating on the surface of the molten metal from entering the overflow openings.
  • the protective ring serves as an inhibit member and projects with its upper part from the surface of the molten bath level to such an extent that no slag particles or the like can pass across its upper rim.
  • the projection above the bath level can be achieved by selecting the shape of the protective ring and its specific weight in correspondence to the particles floating on the surface of the melting bath or of the melting bath itself, independently from the actual level of the bath.
  • the mobility of the protective ring in the upward direction can be restricted by a stopper on the starting tube. This prevents the protective ring from disengaging from the starting tube.
  • the protective ring can also be fixed at a specific position with respect to the starting tube or its overflow openings. This can counteract the unwanted Vortex-effect, namely, the level in the tundish dropping on the occasion of an exchange of ladles.
  • the starting tube can also be provided with openings in its lower region too.
  • said openings are at first closed by pieces of sheet material so that at first they do not have any function when casting starts up. Under the action of the high temperatures of the melting bath these sheets are eventually melted so that now steel can flow through said openings into the outlet. In the normal melting procedure this actually is not necessary, since the overflow openings in the upper part of the starting tube meet this function. At the end of the sequence, however, these lower openings take over the function that the steel can flow out of the tundish so that only a small residue will result (so-called button).
  • a tundish 13 is provided with a lining 13A which can be replaced upon wear. Underneath said lining 13 there is a permanent lining 14 and an insulating lining 15. 16 refers to the casing of the tundish itself.
  • the tundish has an outlet or pouring opening 4 in its base and the entrance to the outlet is surrounded inside the tundish by a starting tube 1.
  • Starting tube 1 has openings 3 towards its upper end.
  • a protective ring 2 surrounds starting tube 1 and rests on the base of the tundish when the latter is empty.
  • the surface of the molten steel is covered with a slag layer 11 and a covering insulating layer 10 both of which represent a source of contaminating particles for the steel to be poured through outlet 4.
  • starting tube of Figure 1 is open-topped whereas in the embodiment shown in Figure 2, starting tube 1 has a lid 23 of greater diameter than tube 1 so that it projects beyond the tube at 21.
  • Starting tube 1 as shown in Figure 1 has an inner diameter corresponding to the diameter of the outlet and is attached to the tundish base surrounding outlet 4 and fastened and sealed so that during the initial phase steel cannot reach outlet 4 directly and that tube 1 cannot float up.
  • Said tube 1 is open at the top and has slots 3 towards its upper end at a predetermined distance from the tundish base which slots are dimensioned such that the amount of steel that can flow through is larger than that corresponding to the predetermined diameter of the outlet.
  • a protective ring 2 the goemetrical shape and buoyancy of which is such that it floats up due to the buoyancy caused by the steel 12 and assumes a floating position partially submerged in the steel 12 and partly protruding above slag 11 and insulating layer 10.
  • tube 1 inhibits, as long as it remains in place, and even when ladles are exchanged, characterised by a drop in the steel level, the so-called Vortex-effect, i.e. the drawing-in of slag into the outlet.
  • Vortex-effect i.e. the drawing-in of slag into the outlet.
  • tube 1 is designed in a manner that at the end of the sequence it will leave its position and float up or that it is mechanically forced to do so.
  • tube 1 may be designed in a manner that floating ring 2 is prevented from floating up further at the upper part of tube 1 during the casting procedure. This embodiment is shown in Figure 2.
  • the starting tube 1 is provided with overflow openings 3, which have a specific height and which are distributed over the circumference of starting tube 1.
  • Overflow openings 3 have a total surface which is adjusted to the inlet opening of outlet 4.
  • tube 1 is provided with a cover 23, which may be integral or a separate lid.
  • Numeral 21 designates a projection of cover 23 which prevents the floating protective ring from disengaging from starting tube 1 in the upward direction - as shown in dotted form at the right hand side.
  • a further opening is shown at 22, though a plurality of such openings can be provided distributed over the circumference of starting tube 1.
  • Said opening 22 is closed by the sheet element 22A so that these openings, at first, cannot perform any function.
  • steel can flow through opening 22. Since openings 22 are positioned rather far down the starting tube it can be achieved that the tundish empties to a very large extent at the end of the sequence.
  • the use of such starting tubes is of advantage since in the processes used so far, starting tube 1 was removed after the actual starting procedure. This gives rise to the danger that through pouring from the tundishes contaminations get into the casting strand.
  • the tube is also designed such that the pouring system can be preheated from below, which nowadays is a common measure. When doing so, care must be taken that the waste gases resulting from the burners can escape through slots 3 in the inner body, without problems occurring.
  • the heating of the pouring system thus is more intensive so that the heating period or the energy density of the burner can be reduced. There is no reason either why a common tundish should not be heated from above, as both systems - heating from below and heating from above - can work independently from each other. Due to the large heat reservoir after the heating it is possible to prolong the interruption period between heating and use of the tundish while equally good preheating is maintained.
  • the system can be used for applying, immediately after the heating and before the feeding of the steel to the tundish, the intended covering agents for insulation onto the tundish floor, since floating-up ring 2 around tube 1 prevents the corresponding slag or the still loose covering agent from flowing into the pouring system. This avoids the introduction of oxygen at the steel surface occurring hitherto and simultaneously reduces heat radiation and/or reduction in the steel casting temperature in the tundish during the first few minutes after the start.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Coating With Molten Metal (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (9)

  1. Mittel zum Zurückhalten von in Metallschmelze in einem Behälter enthaltenen Verunreinigungen, wobei der Behälter einen Auslaß aufweist, durch den die Metallschmelze gegossen wird, und ein ringförmiger Auftriebskörper (2) darin den Auslaß (4) umgibt, wobei der Körper (2) in Gestalt eines Schutzrings vorliegt, der auf der Oberfläche der Metallschmelze (12) schwimmende Teilchen (10, 11) daran hindert, in den Auslaß (4) einzutreten, dadurch gekennzeichnet, daß das Mittel ein an dem Auslaß befestigtes Einlaßrohr (1) umfaßt, wobei das Einlaßrohr Überlauföffnungen (3) für die Metallschmelze aufweist und die Überlauföffnungen im oberen Bereich des Einlaßrohrs um den Umfang verteilt sind, so daß die Metallschmelze erst nach Erreichen der Überlauföffnungen durch den Auslaß laufen kann, und daß der Auftriebskörper (2) das Einlaßrohr (1) mit einem Abstand umgibt und mit steigen- dem Spiegel der Metallschmelze (12) im Einlaßrohr (1) nach oben schwimmt und dadurch auf der Oberfläche der Metallschmelze schwimmende Teilchen (10, 11) am Eintritt in die Überlauföffnungen (3) hindert.
  2. Mittel nach Anspruch 1, dadurch gekennzeichnet, daß Auslegung und spezifisches Gewicht des Schutzrings (2) derart sind, daß sein unteres Ende in die Metallschmelze (12) eintaucht und sein Hauptkörper auf der Oberfläche der Metallschmelze schwimmt.
  3. Mittel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das spezifische Gewicht des Materials des ringförmigen Auftriebskörpers (2) näher an dem der auf der Oberfläche schwimmenden Teilchen als an dem der Metallschmelze (12) liegt.
  4. Mittel nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der ringförmige Auftriebskörper (2) einen Querschnitt aufweist, der sich zum unteren Ende hin verjüngt, sowie vorzugsweise eine konische äußere Gestalt.
  5. Mittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der ringförmige Auftriebskörper (2) aus einem feuerfesten Material besteht.
  6. Mittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der ringförmige Auftriebskörper (2) unter anderem schlackenbildende und Abdeckmittel enthält.
  7. Mittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Einlaßrohr (1) an seinem oberen Ende (23) geschlossen ist oder mittels eines Verschlußdeckels verschlossen werden kann.
  8. Mittel nach Anspruch 10, dadurch gekennzeichnet, daß der Durchmesser des Deckels (23) größer ist als der des Einlaßrohrs (1), wobei der überstehende Teil (21) des Deckels somit eine weitere Aufwärtsbewegung des ringförmigen Auftriebskörpers (2) verhindert, wenn dieser oben angekommen ist.
  9. Mittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der untere Bereich des Einlaßrohrs (1) mit Öffnungen (22) versehen ist, die mittels schmelzbarer Stücke von Platten (22A) verschlossen sind.
EP90305293A 1989-06-08 1990-05-16 Vorrichtung zur Halterung und/oder zum Ausgiessen für Behälter für Metallschmelzbäder Expired - Lifetime EP0401988B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90305293T ATE97598T1 (de) 1989-06-08 1990-05-16 Vorrichtung zur halterung und/oder zum ausgiessen fuer behaelter fuer metallschmelzbaeder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8907044U DE8907044U1 (de) 1989-06-08 1989-06-08 Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen
DE8907044U 1989-06-08

Publications (3)

Publication Number Publication Date
EP0401988A2 EP0401988A2 (de) 1990-12-12
EP0401988A3 EP0401988A3 (de) 1991-02-06
EP0401988B1 true EP0401988B1 (de) 1993-11-24

Family

ID=6839928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90305293A Expired - Lifetime EP0401988B1 (de) 1989-06-08 1990-05-16 Vorrichtung zur Halterung und/oder zum Ausgiessen für Behälter für Metallschmelzbäder

Country Status (8)

Country Link
EP (1) EP0401988B1 (de)
JP (1) JPH0371971A (de)
AT (1) ATE97598T1 (de)
CA (1) CA2018376A1 (de)
DD (1) DD294890A5 (de)
DE (2) DE8907044U1 (de)
ES (1) ES2045806T3 (de)
TR (1) TR27237A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8907044U1 (de) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen
DE3922549A1 (de) * 1989-07-08 1991-01-10 Metacon Ag Vorrichtung zum schlackenfreien angiessen von stranggiessanlagen
DE10115097A1 (de) * 2001-03-27 2002-10-24 Rhi Ag Wien Einrichtung zur Verhinderung eines Vortex-Effekts im Auslaufbereich eines metallurgischen Schmelzgefäßes
GB2450896A (en) * 2007-07-10 2009-01-14 Anglo American Platinum Corp Separating apparatus and method for assaying
US9646831B2 (en) 2009-11-03 2017-05-09 The Trustees Of Columbia University In The City Of New York Advanced excimer laser annealing for thin films
CN102398004A (zh) * 2011-11-29 2012-04-04 中冶南方工程技术有限公司 防止旋涡产生的滑动水口装置
CN107774913B (zh) * 2017-10-13 2020-04-07 共享装备股份有限公司 用于砂型的浇口盆及其制造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH517542A (de) * 1970-10-26 1972-01-15 Concast Ag Vorrichtung zum Abschluss einer Durchflussöffnung gegenüber Schlacke bei Giessgefässen
DE2316757C3 (de) * 1973-04-04 1978-08-03 Thermo-Industrie Gmbh & Co Kg, 3300 Braunschweig Gießpfanne für Stahl
DE2830811C2 (de) * 1978-07-13 1982-07-29 Eisen- und Stahlwerk Pleissner GmbH, 3420 Herzberg Verfahren und Vorrichtung zum Gießen von Formgußstücken
US4526349A (en) * 1983-12-13 1985-07-02 Schwer John W Method and article of manufacture for controlling slag carry-over during tapping of a heat in steelmaking
DE8907044U1 (de) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen

Also Published As

Publication number Publication date
DE8907044U1 (de) 1989-08-03
EP0401988A2 (de) 1990-12-12
DE69004742T2 (de) 1994-03-17
DE69004742D1 (de) 1994-01-05
ATE97598T1 (de) 1993-12-15
JPH0371971A (ja) 1991-03-27
TR27237A (tr) 1994-12-20
ES2045806T3 (es) 1994-01-16
EP0401988A3 (de) 1991-02-06
CA2018376A1 (en) 1990-12-08
DD294890A5 (de) 1991-10-17

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