EP0527717A1 - Verfahren und Vorrichtung zum Stranggiessen einer Metallschmelze - Google Patents

Verfahren und Vorrichtung zum Stranggiessen einer Metallschmelze Download PDF

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Publication number
EP0527717A1
EP0527717A1 EP92870117A EP92870117A EP0527717A1 EP 0527717 A1 EP0527717 A1 EP 0527717A1 EP 92870117 A EP92870117 A EP 92870117A EP 92870117 A EP92870117 A EP 92870117A EP 0527717 A1 EP0527717 A1 EP 0527717A1
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EP
European Patent Office
Prior art keywords
tubular element
mold
refractory material
casting
metal
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Application number
EP92870117A
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English (en)
French (fr)
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EP0527717B1 (de
Inventor
Stéphan Wilmotte
Paul Naveau
Christian Marique
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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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 present invention relates to a process for the continuous casting of a molten metal, in particular steel. It also relates to a device for implementing this method.
  • Continuous casting is a widely used technique which allows steel to be poured directly from a casting container into a bottomless ingot mold, from which it is extracted in the form of a continuous, partially solidified strand.
  • the pouring container is usually a ladle or a distribution basket; for simplicity, we will refer here, generically, to a distribution basket.
  • the bottom of the distributor basket is pierced with a hole with which a shutter member of known type cooperates.
  • a pouring nozzle Under the bottom of the basket and coaxially to the pouring hole is fixed a pouring nozzle, which plunges freely into the upper part of the mold itself.
  • This ingot mold is made of copper and is cooled with water.
  • the mold is usually driven in an oscillating movement, of an amplitude of a few millimeters, intended to prevent the sticking of the steel to its walls.
  • the steel coming from the distributor basket flows through the nozzle into the mold, where it gradually solidifies, forming a skin of increasing thickness.
  • the lower end of the nozzle is immersed in liquid steel, the upper level, or meniscus, is located in the upper portion of the mold.
  • the current technique of continuous casting has various drawbacks which are the source of the defects observed in the cast products.
  • it is very difficult to maintain a rigorously constant level of steel in the ingot mold, mainly when the steel flow rate is high and the ingot mold is of small section; these variations in level disturb the start of solidification and cause surface defects in the products.
  • the casting speed therefore remains limited, in particular for products of small cross-section.
  • it is not possible to completely prevent the formation of internal cracks and axial segregation in the cast products, despite all the precautions that can be taken to achieve precise control of the equipment and manufacturing conditions.
  • the object of the present invention is to provide a method, as well as an implementation device, for the continuous casting of a molten metal, which allows high quality products to be cast at high speed as regards the surface condition and internal health.
  • the basic idea of the invention is to prevent the meniscus from establishing itself in the region where the skin of the metal begins to solidify.
  • a method for casting a molten metal in which the molten metal is poured into an ingot mold where it solidifies, is characterized in that the upper level, or meniscus, is established, of said molten metal in a region located upstream from the point where solidification of said metal begins in the mold.
  • an oscillation movement preferably vertical, having an amplitude less than 0.5 mm, and advantageously of the order of 0.2-0.3 mm, is applied to the ingot mold.
  • a forced lubrication of the ingot mold is carried out, preferably by injecting a lubricant through at least one of its walls.
  • the solidification of the molten metal begins and always continues in the ingot mold, as in the conventional casting processes; however, the meniscus is thrown upstream from where this solidification begins.
  • the variations in the level of the metal that is to say the position of the meniscus, therefore no longer disturb the start of solidification and no longer result in surface defects in the cast product.
  • the invention also relates to a device for the continuous casting of a molten metal, which comprises a pouring vessel provided with a pouring orifice and a bottomless ingot mold placed under said pouring orifice, characterized in that it comprises a tubular element of refractory material disposed between the casting container and the mold, in alignment with the latter, in that said tubular element of refractory material is rigidly fixed, by its lower end, to the upper part of the mold, and in that said tubular element of refractory material is connected by its upper end to said casting container.
  • the mold is advantageously equipped with means intended to reduce the friction between the cast product and the wall of the mold, in particular means for applying to the mold a vibration having an amplitude less than 0.5 mm, preferably of the order of 0.2-0.3 mm, and / or means for carrying out forced lubrication by injecting a lubricant through at least one wall.
  • An elastic seal is preferably interposed between said tubular element of refractory material and the casting container, in order to absorb the vibrations originating from the mold and not to damage the tubular element.
  • Different devices can be placed between the bottom of the casting container and the upper end of said tubular element of refractory material, under the essential condition that these devices constitute a closed assembly between the casting container and said tubular element, and preferably with interposition of the aforementioned elastic seal between said closed assembly and the tubular element.
  • tubular element made of refractory material can be equipped with means for causing intense agitation of the metal which it contains, in particular inductors intended to put the metal in rotation in said tubular element.
  • the section of said tubular element of refractory material preferably has a shape which corresponds to that of the mold. It is advantageously slightly smaller than the latter.
  • Fig. 1 shows the principle of the casting device of the invention, which consists in making a closed enclosure from the casting container to the mold and establishing the meniscus in a region where the metal remains in the liquid state.
  • the pouring device of the invention comprises a distributor basket 1 with, in the bottom, a tap hole 2 which can be closed by a stopper 3.
  • a stopper 3 In this respect, it goes without saying that any other type could be used known shutter member, for example a drawer shutter.
  • a tubular element 4 made of refractory material is placed under the bottom of the distributor basket 1, coaxially with the tap hole 2.
  • the tubular element 4 is assembled to the mold 5, by means of a seal made of refractory material 6.
  • the mold 5 is made of copper and it is equipped with a cooling system. , not shown.
  • it is driven by a low amplitude oscillation movement, applied by means not shown here; the vibrations are absorbed by an elastic seal 21 and they are therefore not transmitted to the distribution basket.
  • the seal in refractory material 6 is of the "break ring" type used in horizontal continuous casting machines; it is for example made of boron nitride.
  • the ingot mold 5 is followed by a secondary cooling system 7, which is not part of the present invention and which can be a conventional system composed of support rollers and sprinklers.
  • the steel is poured from the distributor basket 1 into the tubular element 4 made of refractory material and then into the cooled copper ingot mold 5.
  • the meniscus 8 is located in the tubular element 4 made of refractory material, and the position of this meniscus is controlled by a flow control device of known type; in the present invention, it is not necessary for the control of this position to be carried out very precisely.
  • Solidification of the steel surface begins at the entrance to the mold, immediately after the refractory seal 6; it continues in the usual way in the mold 5 and in the secondary cooling system 7, to form a solidified skin 20 of increasing thickness.
  • a variation in the position of the meniscus 8 during casting therefore has no effect on the place where the solidification of the steel surface begins and it therefore no longer results in the formation of surface defects.
  • the section of the ingot mold 5 can be as small as desired, for example for the continuous casting of thin slabs, since the device no longer comprises a submerged nozzle.
  • the tubular element 4 may have a section of small dimensions, proportional to those of the mold. It suffices that the inlet section of the tubular element 4 can receive the casting jet 9 coming from the distributor basket 1.
  • this tubular element 4 is shown here with a constant section over its entire length; it goes without saying that this section could vary over the length of the tubular element 4, preferably with at least one section having a smaller section than the ingot mold, to give this element the profile of a funnel for example.
  • the casting speed is limited in particular by the instability of the position of the meniscus 8, which increases when the casting speed increases and which therefore multiplies the risks of formation of surface defects. Thanks to the device of the invention, this risk is largely eliminated and the casting speed can be significantly increased.
  • Fig. 2 illustrates a particular continuous casting installation which applies the principle exposed in FIG. 1.
  • This installation comprises several additional devices, known per se, which make it possible in particular to cast the steel with low overheating and to accelerate the cooling of the cast product. All these devices are placed in series and they are aligned along the axis of the casting installation; in the representation of FIG. 2, this axis is vertical, but it could just as easily be curved, as is the case in different types of continuous casting machines.
  • a vertical duct 10 also called a hollow jet nozzle, composed of a refractory section 11 and a cooled metal section 12.
  • a dome 13 of refractory material defining a peripheral channel with the inner wall of the refractory section 11.
  • the dome 13 is equipped with a cane 14 for injecting gas inside the metal section 12.
  • the refractory section 11 is generally cylindrical, while the metal section 12 is advantageously convergent, to take account of a certain contraction due to the start of cooling and solidification, as will be recalled below.
  • the vertical conduit 10 opens at its lower end into the tubular element 4 made of refractory material which has been defined above.
  • the elastic seal 21 is placed between the vertical duct 10 and the tubular element 4.
  • This tubular element 4 is provided with inductors 15, intended to stir the steel present in the tubular element 4.
  • the tubular element 4 is connected to the ingot mold 5 made of copper, cooled with water.
  • the ingot mold is here equipped with a forced lubrication system, symbolized by the arrows 16 which indicate the channels for introducing the lubricant. This is introduced into the area at the start of the solidification of the steel.
  • a device 17 has also been shown for applying vibrations of low amplitude to the mold. These vibrations are absorbed by the elastic seal 21.
  • a secondary cooling device 7 comprising a system 18 of intense cooling by means of a layer of water under pressure, and a system 19 of moderate cooling in the calmer water of the cast product. .
  • the volume occupied by the water is shown in dotted lines.
  • the steel initially exhibits a slight overheating, for example of the order of 20 ° C., it may undergo in the metal section 12 a start of cooling, which makes it slightly pasty.
  • This steel then reaches the tubular element 4 of refractory material, where it does not undergo significant cooling.
  • the inductors 15 give it a rotational movement which produces an intense mixing of the steel, makes it very homogeneous and provides it with a sufficiently low viscosity.
  • the steel finally enters the mold 5 where, upon contact with the seal 6, it begins to solidify in a conventional manner, with a solidified skin 20 of increasing thickness.
  • Solidification continues in the secondary cooling device 7: the system 18 ensures intense cooling of the skin of the product, and the moderate cooling system 19 prevents too rapid heating of the skin after the intense cooling. This secondary cooling in two stages makes it possible to greatly reduce the formation of internal cracks in the cast product.
  • slightly pasty steel solidifies with a homogeneous structure, exhibiting almost zero axial segregation.
  • the method of the invention and its implementation device therefore make it possible to flow steel products more quickly which have an excellent surface condition and very good internal health.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP92870117A 1991-08-12 1992-08-06 Verfahren und Vorrichtung zum Stranggiessen einer Metallschmelze Revoked EP0527717B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9100734A BE1005165A3 (fr) 1991-08-12 1991-08-12 Procede et dispositif pour la coulee continue d'un metal en fusion.
BE9100734 1991-08-12

Publications (2)

Publication Number Publication Date
EP0527717A1 true EP0527717A1 (de) 1993-02-17
EP0527717B1 EP0527717B1 (de) 1997-02-19

Family

ID=3885646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92870117A Revoked EP0527717B1 (de) 1991-08-12 1992-08-06 Verfahren und Vorrichtung zum Stranggiessen einer Metallschmelze

Country Status (4)

Country Link
EP (1) EP0527717B1 (de)
AT (1) ATE149005T1 (de)
BE (1) BE1005165A3 (de)
DE (1) DE69217521T2 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE519819A (de) * 1953-05-08 1955-05-13
EP0269180B1 (de) * 1986-11-26 1992-01-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Vorrichtung zum Giessen eines pastenartigen Metalles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS619949A (ja) * 1984-06-25 1986-01-17 Nippon Steel Corp 鋳造初期の酸化防止連続鋳造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE519819A (de) * 1953-05-08 1955-05-13
EP0269180B1 (de) * 1986-11-26 1992-01-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Vorrichtung zum Giessen eines pastenartigen Metalles

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 155 (M-485)(2211) 4 Juin 1986 & JP-A-61 009 949 ( SHIN NIPPON SEITETSU K.K ) 17 Janvier 1986 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 310 (M-850)(3658) 14 Juillet 1992 *

Also Published As

Publication number Publication date
DE69217521T2 (de) 1997-09-11
BE1005165A3 (fr) 1993-05-11
ATE149005T1 (de) 1997-03-15
EP0527717B1 (de) 1997-02-19
DE69217521D1 (de) 1997-03-27

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