EP0447088B1 - Vergiessen von geschmolzenem Metall - Google Patents

Vergiessen von geschmolzenem Metall Download PDF

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Publication number
EP0447088B1
EP0447088B1 EP19910301774 EP91301774A EP0447088B1 EP 0447088 B1 EP0447088 B1 EP 0447088B1 EP 19910301774 EP19910301774 EP 19910301774 EP 91301774 A EP91301774 A EP 91301774A EP 0447088 B1 EP0447088 B1 EP 0447088B1
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EP
European Patent Office
Prior art keywords
slab
insulating
molten metal
thickened
tundish
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
EP19910301774
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English (en)
French (fr)
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EP0447088A1 (de
Inventor
Andre Hettler
Augustin Grillet
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
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Filing date
Publication date
Application filed by Foseco International Ltd filed Critical Foseco International Ltd
Publication of EP0447088A1 publication Critical patent/EP0447088A1/de
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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

Definitions

  • the invention relates to an insulating slab for use as a covering layer for molten metal in a molten metal handling vessel, according to the preamble of claim 1 and to a method of insulating the surface of molten metal in a handling vessel, according to the preamble of claim 14.
  • pouring of molten metal from a ladle to another vessel, e.g. a mould is via an intermediate vessel, e.g. a tundish, particularly in the continuous casting of molten metal such as steel.
  • a covering layer to the molten metal in a vessel such as a tundish in order to provide insulation against excessive heat loss and also to react with the molten metal to remove unwanted inclusions, e.g. of alumina.
  • a vessel such as a tundish
  • rice husks are frequently used or other, for example, basic materials formulated for the particularly desired reaction.
  • Such covering layers have usually been applied in powder form but there have been proposals to apply a covering layer in sheet form. In principle this can be advantageous in reducing dust levels and in containing dangerous splashing of molten metal during the pouring operation.
  • the use of two refractory heat-insulating slabs is described in British Patent Specification No. 1571333.
  • the slabs are pivotally-mounted at an upper edge or in a wall portion of a tundish in spaced apart relationship and extending downward into the vessel.
  • the molten metal is poured between the slabs which can, therefore, contain any splash and, as pouring continues, the slabs rise on the molten metal until they are horizontal.
  • the slabs thereby provide a cover to reduce heat loss and to contain any powder additives.
  • Tundishes which may be generally rectangular in plan form, usually are frusto-conical in vertical transverse section with the walls sloping outwardly in the upwards direction.
  • One serious disadvantage of covering the molten metal by sheet material therefore, is that the sheet cannot cover the entire metal surface as the metal level rises and an increasing gap between sheet and tundish wall is unprotected.
  • the present invention provides an insulating slab for use as a covering layer for the molten metal in a molten metal handling vessel having outwardly sloping side walls, e.g. a tundish, in which the slab is floatable on the molten metal surface and comprises at least a layer of heat-insulating material which is shaped to have thickened portions extending along at least two opposite edges, which thickened portions are capable of expansion and powdering under the action of the molten metal.
  • the invention provides a method of insulating the surface of molten metal in a handling vessel having outwardly sloping side walls, e.g. a tundish, which comprises placing a covering layer in the form of a floatable slab of heat-insulating material on the surface of the molten metal, in which the slab is shaped to have thickened portions extending along at least two opposite edges of the slab, which thickened portions of the insulating material layer extend along the two sides of the slab that correspond to the outwardly sloping walls of the handling vessel.
  • the gap that would otherwise appear between slab and sidewall can be substantially filled with powdered material that has been formed by expansion and erosion of the thickened portions under the action of the hot metal.
  • composition of the insulating layer of the slab can be particularly formulated to expand and powder under the action of the heat of the molten metal.
  • the insulating layer may be formed from refractory fibres, e.g. calcium silicate or aluminosilicate; refractory filler, e.g. silica, alumina, magnesia or refractory silicates; and a binder, e.g. colloidal silica sol, sodium silicate, starch, phenol-formaldehyde resin or urea-formaldehyde resin.
  • Expandable materials e.g. expandable graphite, perlite or vermiculite may conveniently be included in order to give the desired expansion and powdering properties.
  • a second layer which can be a reactive flux layer of lesser insulating properties than the insulating layer, is attached to the underside of the insulating layer so that the slab can be chosen to optimise the insulation and reaction properties that are desired.
  • the second layer may be formed from any desired flux composition.
  • Such compositions are well known and may be based on various metallic oxides, e.g. mixtures of oxides of calcium, aluminium and magnesium, with other additives, e.g. carbon and calcium fluoride.
  • the thickened edge portions of the slab extend downwardly from the plane of the slab when considered in its horizontal position in a tundish.
  • two or more covering slabs of the invention in a tundish.
  • two slabs may be positioned in the empty tundish, one to each side of the entry zone.
  • a flat conventional slab 1 is made of fibre, filler and binder. In contact with molten steel the slab will expand and form powder, the powder and any residual slab forming a layer on top of the rising level of molten metal.
  • slab 2 has a thickened, depending edge 3. This edge is of frusto-conical or wedge shape. It too will expand and form powder under the action of contact with molten steel.
  • Figure 3 shows a slab 4 having a thickened depending edge 5 of different, parallelopiped shape.
  • Figure 4 shows the insulating slab 2 of Figure 2 with a reactive flux layer 6 attached to its underside.
  • a tundish 7 has upwardly and outwardly sloping sidewalls 8 and 9 and a base 10.
  • a slab 11 of the invention is placed in the tundish when empty and rests with its depending thickened edges 13 and 14 contacting the side walls 8 and 9 near to base 10.
  • Molten steel is then introduced into the tundish. It enters underneath slab 11, which then rises floating on the molten metal surface.
  • the filled tundish is shown in Figure 6.
  • the hot metal causes expansion and powdering of the slab.
  • the edges 13 and 14 have powdered to cover the gaps 15 and 16 that would otherwise have been left uncovered between the sidewalls and the slab.
  • the underside layer 17 of the slab has also started to react with the metal and, as shown, has to a degree insulated the upper layer 18 of the slab from the metal so that the slab has still retained some of its integrity.
  • tundish 19 has an outlet 20, closable by a stopper rod 21.
  • a slab 22 of the invention has a thickened edge 23 and an aperture 24 to accommodate the stopper rod.
  • the aperture 24 is also surrounded by a depending thickened portion 25 of the slab.

Landscapes

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

Claims (14)

  1. Dämmplatte zur Verwendung als Deckschicht für die Metallschmelze in einem Metallschmelzenbehandlungsgefäß mit nach außen geneigten Seitenwänden, z.B. einem Zwischenbehälter, wobei die Platte auf der Metallschmelzen- oberfläche schwimmfähig ist und mindestens eine Wärme- dämmstoffschicht umfaßt, dadurch gekennzeichnet, daß die Platte (2, 4) so geformt ist, daß sie einen verdickten Abschnitt (3, 5) aufweist, der sich entlang mindestens zweier gegenüberliegender Kanten der Platte erstreckt und der unter Wirkung der Metallschmelze expandierfähig ist und zu Pulver zerfallen kann.
  2. Dämmplatte nach Anspruch 1, wobei die Platte zur Verwendung in einem Zwischenbehälter (7) mit kegelstumpf- förmigem Querschnitt und sich vom Boden (10) des Zwischenbehälters nach oben erstreckenden, nach außen geneigten gegenüberliegenden Wänden (8, 9) vorgesehen ist, dadurch gekennzeichnet, daß die verdickten Kanten- abschnitte (13, 14) der Platte (11) den geneigten Wänden (8, 9) des Zwischenbehälters (10) entsprechen und daher so positioniert werden können, daß sie sich im wesentlichen parallel zu diesen erstrecken.
  3. Dämmplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dämmschicht aus feuerfesten Fasern, feuerfestem Füllstoff und einem Bindemittel gebildet ist.
  4. Dämmplatte nach Anspruch 3, dadurch gekennzeichnet, daß die feuerfeste Faser aus Calciumsilicat oder Aluminiumsilicat besteht.
  5. Dämmplatte nach Anspruch 4, dadurch gekennzeichnet, daß der feuerfeste Füllstoff aus Siliciumdioxid, Aluminiumoxid, Magnesiumoxid oder feuerfestem Silicat besteht.
  6. Dämmplatte nach Anspruch 3, 4 oder 5, dadurch gekennzeichnet, daß es sich bei dem Bindemittel um Kolloidkieselsol, Natriumsilicat, Stärke, Phenolformaldehyd oder Harnstoff-Formaldehyd-Harz handelt.
  7. Dämmplatte nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Dämmschicht als in der Wärme expandierbares Material expandierbares Graphit, Perlit oder Vermiculit enthält.
  8. Dämmplatte nach einem der vorhergehenden Ansprü- che, dadurch gekennzeichnet, daß an der Unterseite der Dämmschicht (2) der Platte eine Schicht (6) aus reaktionsfähigem Flußmittel mit geringeren Dämmeigenschaften als die Dämmschicht (2) befestigt ist.
  9. Dämmplatte nach Anspruch 8, dadurch gekennzeich- net, daß die Schicht aus reaktionsfähigem Flußmittel aus einem oder mehreren Metalloxiden mit Kohlenstoff oder Calciumfluorid gebildet ist.
  10. Dämmplatte nach einem der vorhergehenden Ansprü- che, dadurch gekennzeichnet, daß der verdickte Kanten- abschnitt (3, 5) eine kegelstumpfförmige Form oder die Form eines Parallelepipedons aufweist.
  11. Dämmplatte nach einem der vorhergehenden Ansprü- che, dadurch gekennzeichnet, daß sich die verdickten Kantenabschnitte (3, 5) von der Ebene der Platte aus nach unten erstrecken, wenn letztere horizontal im Metall- schmelzenbehandlungsgefäß positioniert wird.
  12. Dämmplatte nach einem der vorhergehenden Ansprü- che, dadurch gekennzeichnet, daß sich in der Platte (22) eine Öffnung (24) zur Aufnahme z.B. einer Stopfenstange (21) befindet.
  13. Dämmplatte nach Anspruch 12, dadurch gekennzeichnet, daß die Öffnung (24) von einem nach unten gehenden verdickten Abschnitt (25) der Platte (22) umgeben ist.
  14. Verfahren zur Wärmedämmung der Metallschmelzen- oberfläche in einem Behandlungsgefäß mit nach außen geneigten Seitenwänden, z.B. einem Zwischenbehälter, das das Anbringen einer Deckschicht in Form einer schwimmfähigen Platte aus Wärmedämmstoff auf der Oberfläche der Metallschmelze umfaßt, dadurch gekennzeichnet, daß die Platte (11) so geformt ist, daß sie verdickte Abschnitte (13, 14) aufweist, die sich entlang mindestens zweier gegenüberliegender Kanten der Platte erstrecken, und die Platte (11) so in dem Gefäß (7) angebracht wird, daß ihre verdickten Abschnitte (13, 14) an den geneigten Wänden (8, 9) angrenzen, Metallschmelze in das Gefäß gegossen wird, die Platte (11) auf der Metalloberfläche steigt und die Platte unter der Wirkung der Metallwärme zu Pulver zerfällt, wobei das aus den verdickten Kanten (13, 14) gebildete Pulver die sich zwischen der steigenden Platte (11) und den geneigten Wänden (8, 9) bildenden Lücken (16, 17) bedeckt.
EP19910301774 1990-03-13 1991-03-04 Vergiessen von geschmolzenem Metall Expired - Lifetime EP0447088B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909005677A GB9005677D0 (en) 1990-03-13 1990-03-13 Pouring molten metal
GB9005677 1990-03-13

Publications (2)

Publication Number Publication Date
EP0447088A1 EP0447088A1 (de) 1991-09-18
EP0447088B1 true EP0447088B1 (de) 1994-05-18

Family

ID=10672566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910301774 Expired - Lifetime EP0447088B1 (de) 1990-03-13 1991-03-04 Vergiessen von geschmolzenem Metall

Country Status (3)

Country Link
EP (1) EP0447088B1 (de)
DE (2) DE69101999T2 (de)
GB (1) GB9005677D0 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10105620A1 (de) * 2001-02-08 2002-09-12 Thyssenkrupp Stahl Ag Verfahren und Abdeckplatte zur Erzeugung einer Schlackeschicht auf der Oberfläche einer Metallschmelze
DE102016112044B4 (de) 2016-06-30 2019-01-03 Refratechnik Holding Gmbh Verwendung einer wärmedämmenden Platte zur Isolation von Metallschmelzen gegenüber der Atmosphäre oder einem metallurgischen Gefäß

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1571333A (en) * 1977-03-28 1980-07-16 Foseco Trading Ag Method of pouring molten metal
GB1586683A (en) * 1977-05-25 1981-03-25 Foseco Trading Ag Method of locating a slab of refractory heat-insulating and/or exothermic material on a molten metal surface
DD139220A1 (de) * 1978-10-06 1979-12-19 Eberhard Stuendel Isolierplatte zur auskleidung von verteilergefaessen fuer geschmolzene metalle
DE2852011A1 (de) * 1978-12-01 1980-06-12 Contherm Ind Und Huettenbedarf Zwischenbehaelter, insbesondere fuer eine stranggussanlage
SE8301244L (sv) * 1983-03-08 1984-09-09 Ferrox Ab Platta
US4667939A (en) * 1986-03-26 1987-05-26 Foseco International Limited Purifying steel

Also Published As

Publication number Publication date
DE69101999D1 (de) 1994-06-23
DE69101999T2 (de) 1994-09-15
DE9102853U1 (de) 1991-06-13
GB9005677D0 (en) 1990-05-09
EP0447088A1 (de) 1991-09-18

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