EP0010041B1 - Procédé de coulée continue des métaux avec brassage dans la zone du refroidissement secondaire - Google Patents

Procédé de coulée continue des métaux avec brassage dans la zone du refroidissement secondaire Download PDF

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Publication number
EP0010041B1
EP0010041B1 EP79400695A EP79400695A EP0010041B1 EP 0010041 B1 EP0010041 B1 EP 0010041B1 EP 79400695 A EP79400695 A EP 79400695A EP 79400695 A EP79400695 A EP 79400695A EP 0010041 B1 EP0010041 B1 EP 0010041B1
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EP
European Patent Office
Prior art keywords
casting
metal
electromagnetic
entrainment
solidification
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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
Application number
EP79400695A
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German (de)
English (en)
French (fr)
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EP0010041A1 (fr
Inventor
Robert Alberny
Jacques Ruer
Jean-Pierre Birat
Roger Ventavoli
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Application filed by Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT79400695T priority Critical patent/ATE1884T1/de
Publication of EP0010041A1 publication Critical patent/EP0010041A1/fr
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the present invention relates to the continuous casting of molten metals, in particular steel. It relates more precisely to the operations of mixing the liquid metal, during solidification in the secondary cooling stage of the casting machine, in order to improve the metallurgical quality of the product obtained.
  • the invention relates in particular to the casting of products of elongated section, for example slabs.
  • the liquid interior part of the product is therefore substantially in the form of a cone, the base of which corresponds to the free surface of the metal in the mold and the top of which is located at the outlet of the cooling stage. secondary. It is customary to designate this cone by the expression “liquid well” or “solidification well”, and the distance separating the base from the top by "metallurgical height”.
  • the stirring in the secondary cooling stage of a continuous casting machine of products with elongated format, such as slabs can it be carried out by entraining the liquid metal in a horizontal translational movement, this is that is to say directed perpendicular to the pouring axis and propagating from one small face of the product to the other.
  • This stirring can also consist of a vertical entrainment of the molten metal extended over the entire width of the cast product (German patent n ° 2,720,391) or on its perimeter (French patents n ° 2,085,261 and n ° 2,104,863).
  • the applicant asked the question whether the improvement in metallurgical quality, resulting from an increased proportion of equiaxed solidification structure, was due to the mixing as such, in which case it can be estimated that this means is used to the best of its ability, or if this improvement depends quantitatively on the type of metal drive, that is to say on the directional characteristics of the forced convection movements that are created within the mass in merger, or its extension to most of the product.
  • the subject of the invention is a process for vertical or curved continuous casting of molten metals, in particular steel, for obtaining products of elongated cross section, such as slabs, process according to which, at by means of inductors, the molten metal is subjected during solidification in the stage of the secondary cooling of the casting machine to an electromagnetic stirring action exerted at least in the vicinity of the bottom of the solidification well, and electromagnetic stirring by driving the molten metal in a direction having at least one component along the casting axis, process characterized in that one locates the electromagnetic drive action of the metal along at least one large face of the poured product, in an area whose width represents only a portion of that of said face.
  • the present invention therefore consists, in its essential characteristics, of promoting vertical exchanges of molten material, therefore of stimulating a rise in the liquid metal from the bottom of the solidification well, more effectively than by the methods previously mentioned.
  • the latter by carrying out hori zontal of the liquid metal parallel to the large faces, certainly favoring an exchange of material between the regions located at the same level respectively in the vicinity of one and the other of the small faces but are hardly suitable for allowing an exchange between regions superimposed.
  • the map of the speeds of movements in a plane parallel to the large faces of the product reveals a horizontal motor drive corridor, that is to say subjected directly to the action of the magnetic field and which, for this reason, can be qualified as "driving zone” or “circulation zone” as opposed to the two more diffuse regions of recirculation which are established necessarily to ensure the return of the metal , on either side of the central corridor, in a shape reminiscent of that of butterfly wings.
  • the invention makes it possible to locate exactly where it is desired, the action of the electromagnetic fields and therefore to obtain the desired result.
  • the idea at the base of the present invention therefore consists in fetching these small crystals accumulated at the bottom of the well, and available in large quantities and in transporting them to higher levels of the metallurgical height where one is located. wants to see basalt growth stop in favor of an equiaxed structure.
  • the invention is basically an operation of seeding the most disadvantaged regions of the liquid well, with small equiaxial crystals coming from richer regions located at the bottom of the well.
  • liquid metal is not here as a role for itself but rather 'as a vehicle for collection and transport of solidification germs. Incidentally, it is true, this movement of liquid mass between the bottom of the solidification well and higher regions makes it possible to mix a hot metal with a cooler metal and therefore to homogenize the temperature, which in particular has the effect of reducing the overheating of the upper regions, therefore, to facilitate the growth of the solidification germs which are brought there.
  • the electromagnetic stirring in question here consists in subjecting the cast product to the action of a mobile magnetic field, which gives rise in liquid metal to convection movements directed and oriented in the direction of propagation. of the field.
  • the stirring of the metal is an effective means of controlling the solidification structure of the cast product
  • the mobile magnetic field constitutes, apart from a privileged implementation tool, since it allows the stirring to be controlled. itself, by conferring on the user the control of the driving of the metal, therefore the control of the convection movements which he wishes to develop there.
  • the poured metal already solidified is designated by 1, 2 the liquid well in the course of solidification, 3 the solidification front without distinguishing that relating to the large faces of the slab from that relating on the small faces, 4 the bottom of the solidification well, and at 5 the pouring axis which, moreover, merges with the axis of the slab.
  • the circulation loops of the liquid metal are represented by arrow lines in broken line of small thickness.
  • the motor area referenced X6 of the recirculation zone (s), referenced X7, X8 ... according to their number, where X denotes the number of the figure which represents them.
  • X indicates the number of the figure which shows them for the first time.
  • V B Vellocity vector of the magnetic induction field B
  • liquid metal well is shown in the figures by way of illustration without it being possible to assume quantitatively the actual relationships existing between the metallurgical height and the transverse dimensions of the cast product.
  • the bottom of the solidification well is in the form of a narrow and deep valley oriented parallel to the plane of the large faces and whose slopes are formed by the solidification fronts relating to these large faces.
  • the closure of the well that is to say the end of solidification, then occurs by gradual approximation of the two slopes, without any significant contribution from the solidification fronts of the small faces, unlike less asymmetrical formats, such as circles or squares , in which complete solidification results from an equivalent and simultaneous progression of the entire periphery.
  • the exchanges of materials between the bottom of the well 2 and the higher regions are favored by a configuration of the movements of the metal having a driving zone on a large face of the product which is, not uniformly spread over the width of the well, but limited to a specific portion thereof.
  • FIG. 1 A configuration of this type is illustrated in FIG. 1.
  • the speed map shows a vertical driving zone 16 located in the middle of a large face, followed by two recirculation zones 17 and 18 along the solidification front of each of the small faces, these two zones being arranged symmetrically on either side of the central direct drive zone. Circular movements are thus created roofs curling in planes parallel to the large faces.
  • planar movements being all the more easy as the available surface is more important, it is understood that, taking into account the format of the cast product, this mode of mixing, whose circulation loops occupy the half-width of the well, is more advantageous than the previously known stirring modes, the loops of which close according to the thickness of the liquid well.
  • the vertical driving zone 16, rising in the case of the figure, can be obtained by means of a magnetic field sliding vertically and whose action remains localized in the central region of the well.
  • the one-piece inductor 21 has a structure similar to that of a linear induction motor stator. It is constituted by a flat cylinder head 22 made of laminated sheets having, on its face facing the cast product, notches parallel to each other and perpendicular to the plane of the sheets. These notches are occupied by electrical conductors 23, generally copper bars.
  • the inductor is arranged, in accordance with the invention, facing one of the large faces of the slab and so that the conductive bars 23 are perpendicular to the casting axis 5. As shown in the figure, these bars are connected together in pairs in series so that the electric current flows there in opposite directions. Each bar is spaced from its partner by a number of notches equal to the number of phases of the power supply so as to constitute overall a well known nested type winding.
  • connection box 20 a polyphase, for example three-phase power supply, symbolically represented, at 24, in the figures, by the three phases R, S, T and neutral N, so as to generate a magnetic field sliding vertically along the axis 5.
  • a polyphase for example three-phase power supply, symbolically represented, at 24, in the figures, by the three phases R, S, T and neutral N, so as to generate a magnetic field sliding vertically along the axis 5.
  • this inductor is, as clearly shown in FIG. 2, that the length of the bars 23 is reduced so as to limit its action of electromagnetic mixing of the molten metal to the central zone of the liquid well 2.
  • the mixing mode illustrated in Figure 1 is obtained by a propagation Va of the field oriented from bottom to top. This direction of propagation is achieved by means of the connection mode of the inductor 21 to the power supply 24 as shown diagrammatically in FIG. 2.
  • the letter R, S or T representative of the phase to which it is connected, and possibly surmounted by a line R, S and T indicating the relative direction of the electric current flowing through it.
  • the bars marked R and R constitute a pair connected in series, connected, to the phase R of the supply and are respectively traversed by the same current flowing in opposite directions, for example from left to right for the bar R and from the right left for bar R.
  • the mode of circulation of the liquid metal illustrated in FIG. 1 is reversible, which can be obtained simply by reversing the direction of sliding of the magnetic field, by inversion of two phases of the electrical supply.
  • FIG 12 schematically showing on a circle the three phases R, S, T of the power supply offset from each other by 120 °, as well as their "inverses".
  • R, S, T by rotating vectors, constitutes a convenient means for quickly finding, from a given connection mode of the inductor, the sliding direction of the magnetic field which it creates. It suffices for this to remember that the field progresses as the maximum voltage on each phase, namely in the direction R ⁇ S ⁇ TR ... that is to say, as shown by the arrow in the figure, in the opposite direction from the trigonometric direction.
  • the induction device 31 is this time constituted by the association of several identical inducing units 32, for example six in number and each placed inside a roller tubular support 33.
  • each inductor unit is known and described in detail in the British patent No. 1,405,312 already cited. Recall that it consists of elementary coils 34 arranged side by side, "one after the other, around a common horizontal axis, so as to cover the entire width of the slab.
  • coils belonging to the same inductor unit can be mounted in parallel or in series.
  • reversing the direction of the electric current between two coils can be achieved by reversing either the direction of winding of the windings or the direction of connection.
  • a system similar to a plurality of sliding field inductors (three in the example considered) is thus constructed, each consisting of a vertical succession of coils, and arranged side by side parallel to the casting axis 5 and covering a portion the width of the solidification well 2.
  • inductor units 32 connected to the same phase of the power supply 24 can either be connected in series, as shown in the figure, or in parallel.
  • FIG. 4 Another alternative embodiment of planar movements parallel to the plane of the large faces consists, as shown in FIG. 4, this time in creating two vertical driving zones each located opposite the solidification fronts of the small faces of the product.
  • these two motor zones are oriented in opposite directions, a simple and relatively well organized circulatory regime is established around a perperdicular axis with large faces and passing through the median axis 5.
  • the movements become more complicated if the motor zones (76 and 76 ') are brought closer to axis 5, because recirculation zones 77 and 77' are thus confined in the narrow regions located between a motor zone and the forehead solidification of the nearest small face.
  • Such a drive mode can be obtained, as can be seen in the following two figures 5 and 6, or by means of vertically sliding magnetic fields, produced by inductors arranged facing at least one large face of the slab. and placed laterally on either side of the casting axis.
  • These inductors can be of the “monobloc” type (FIG. 5 ref. 51 and 51 ′) therefore arranged behind the support rollers, and of a design completely similar to the inductor seen previously with reference to FIG. 2, but connected to the power supply 24 so as to create two magnetic fields sliding vertically in opposite directions.
  • inductors can also be constituted by the inducing units 32 previously described, in which case, as shown in FIG. 6, only a few coils 34 per unit 32 will be activated, shifted towards the ends of the large face, facing the solidification front. small sides of the slab.
  • the offset of the coils to be activated will be limited, for example, to the two intermediate zones located halfway between the solidification fronts of the small faces and the middle of the large ones. faces.
  • another configuration of the movements of circulation of the liquid metal capable of ensuring the transport of the crystals between the bottom of the liquid well and the higher regions, consists in creating, as shown in FIG. 8, a motor zone 86 parallel to the large faces of the product, directed obliquely and oriented from the bottom up. There is thus formed on either side of the motor zone 86, a lower recirculation zone 87 and an upper recirculation zone 88.
  • the crystals coming from the lower region 87 penetrate through the lower end of the direct drive zone 86 and exit from it by the upper end, taking the easiest path, that is to say by engaging in the upper region 88.
  • the crystals travel a path a form of "S" passing from the lower half-loop to the opposite upper half-loop without having to make a sudden change of direction.
  • the desirable orientation for the motor area would be horizontal orientation, as is customary.
  • this increasing inclination correlatively disadvantages the possibilities of material exchange between the bottom of the well and the higher levels and therefore goes against the desired result.
  • This compromise is characterized by a metal entrainment parallel to the large faces and whose direction of propagation has a non-zero angle with the horizontal, and preferably between around 30 and 60 °.
  • the direction in which the metal is driven can no longer be reversible, as in the previous brewing modes, but necessarily oriented from bottom to top.
  • the system remains symmetrical with respect to the casting axis 5 as regards the direction of the drive.
  • the first variant is produced, in accordance with FIG. 9, by means of the monobloc inductor 21, already seen with reference to FIG. 2, but this time having an inclined orientation relative to the casting axis 5.
  • the advantage of this variant lies essentially in the fact that the inductor being independent of the constituent members of the casting machine, one is free to give it the desired inclination;
  • the second variant is produced, as shown in FIG. 10, by means of inductor units 32 housed in the support rollers 33.
  • each unit 32 has a functional autonomy and creates a horizontally sliding magnetic field ( ⁇ lt), along generators of the rollers.
  • ⁇ lt horizontally sliding magnetic field
  • the system according to the invention is however characterized by the fact that the inducting units have a phase shift between them, so that a succession of coils of the same rank, taken one after the other on units different, constitutes, as in the case of FIGS. 3 and 6, an inductor with a magnetic field sliding vertically from bottom to top
  • the combined effect of the horizontal displacement field with the field moving vertically upward identifies with the effect of a single field obliquely ropaging according to their result
  • the actual position of the inductor over the metallurgical height is not limited to that visible in the figures. The user can act on this position so that the movements caused reach the immediate vicinity of the bottom of the solidification well.
  • the setting in motion of the liquid metal at the bottom of the well depends not only on the height position of the inductor but also on its power, in other words the intensity of its electromagnetic action on the metal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP79400695A 1978-10-05 1979-10-01 Procédé de coulée continue des métaux avec brassage dans la zone du refroidissement secondaire Expired EP0010041B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400695T ATE1884T1 (de) 1978-10-05 1979-10-01 Verfahren zum stranggiessen von metallen, mit umruehren in der sekundaeren kuehlungszone.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7828726 1978-10-05
FR7828726A FR2437900A1 (fr) 1978-10-05 1978-10-05 Procede de coulee continue des metaux avec brassage dans la zone du refroidissement secondaire

Publications (2)

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EP0010041A1 EP0010041A1 (fr) 1980-04-16
EP0010041B1 true EP0010041B1 (fr) 1982-12-01

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EP79400695A Expired EP0010041B1 (fr) 1978-10-05 1979-10-01 Procédé de coulée continue des métaux avec brassage dans la zone du refroidissement secondaire

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EP (1) EP0010041B1 (es)
AT (1) ATE1884T1 (es)
DE (1) DE2964155D1 (es)
FR (1) FR2437900A1 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8202431L (sv) * 1982-04-19 1983-10-20 Asea Ab Omroring i gjutstreng
FR2528739B1 (fr) * 1982-06-18 1985-08-02 Siderurgie Fse Inst Rech Procede et installation de brassage electromagnetique de brames metalliques, notamment d'acier, coulees en continu
AT379976B (de) * 1984-04-06 1986-03-25 Voest Alpine Ag Ruehreinrichtung an einer stranggiessanlage
DE102014105870B4 (de) * 2014-04-25 2024-10-10 Thyssenkrupp Ag Verfahren und Vorrichtung zum Dünnbrammen-Stranggießen
CN106925762B (zh) * 2015-12-29 2019-11-15 北京有色金属研究总院 一种高剪切强电磁搅拌熔体处理的装置和方法
CN116213664A (zh) * 2023-03-27 2023-06-06 东北大学 一种连铸二冷区分节辊式多模式电磁搅拌控流装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962341B2 (de) 1969-12-12 1971-06-24 Aeg Elotherm Gmbh Anordnung einer mehrphasigen elektromagnetischen wicklung am strangfuehrungsgeruest einer stranggiessanlage
FR2085261B1 (es) * 1970-04-02 1974-08-09 Centrifugation Et
US3693697A (en) * 1970-08-20 1972-09-26 Republic Steel Corp Controlled solidification of case structures by controlled circulating flow of molten metal in the solidifying ingot
NL7206946A (es) 1972-05-24 1973-11-27
US3882923A (en) 1972-06-08 1975-05-13 Siderurgie Fse Inst Rech Apparatus for magnetic stirring of continuous castings
JPS5252895Y2 (es) 1973-04-18 1977-12-01
SE410153B (sv) * 1976-05-21 1979-10-01 Asea Ab Anleggning vid strenggjutning

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Publication number Publication date
FR2437900A1 (fr) 1980-04-30
EP0010041A1 (fr) 1980-04-16
ATE1884T1 (de) 1982-12-15
DE2964155D1 (en) 1983-01-05
FR2437900B1 (es) 1982-05-28

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