KR101213009B1 - Process for the continuous casting of flat metal products with electromagnetic stirring and implementation installation - Google Patents

Abstract

In particular, a method is provided for continuous casting of slabs made of steel or other metal products of long cross section, in which molten metal is poured into a cooled mold 10 and the externally solidified product 14 is continuous from the mold. Is extracted and guided in the secondary cooling zone 12 downstream of the mold 10. In order to obtain a cast product that exhibits solids that are mainly equiaxed, the product 14 extracted from the mold 10 is divided into section 0 of the secondary cooling zone 12 by at least two stirrer rolls 24 incorporated into section 0. 20) electromagnetically stirred.

Cast Products, Support Rolls, Agitator Rolls, Secondary Cooling Zone, Zone 0, Baseplates

Description

Continuous casting method of flat metal products using electromagnetic stirring and the equipment for carrying out the continuous casting method {PROCESS FOR THE CONTINUOUS CASTING OF FLAT METAL PRODUCTS WITH ELECTROMAGNETIC STIRRING AND IMPLEMENTATION INSTALLATION}

The present invention relates to the field of continuous casting of metals, in particular steel. More particularly relates to the continuous casting of long cross-sectional flat products, ie slabs and other similar products, wherein the moving magnetic field acting on the molten cast metal during the continuous casting is the quality of the cast product obtained and / or the conditions or performance of the casting process itself. Used to improve properties.

It will be briefly recalled here that the continuous casting operation consists of pouring molten metal downward into a bottomless mold, which is essentially composed of a metal mold body, which generally defines a passageway for the cast metal. It consists of plates assembled for casting of flat products. The wall is strongly cooled by the water circulation to continuously extract the already solidified product from the outside through the base of the mold over several millimeters of thickness. While descending downstream of the mold in what is called a “secondary cooling” zone, solidification proceeds from the surface and finally reaches the centerline of the product, where it is guided by a support and guide roll (hereinafter referred to as a support roll). The cast product is sprayed with water to extract the heat necessary for its complete solidification. The solidified product thus obtained is then cut and rolled before being delivered to the customer or converted to plate products, sheet products and the like on site.

In the case of flat metal products, and long cross sections called slabs thereon, it has been known for a long time that it affects the electromagnetic stirring of molten metal in the secondary cooling zone of a continuous casting plant.

Schematically, electromagnetic agitation consists, as is known, of applying one or more moving magnetic fields to the slab (i.e., a magnetic field whose maximum intensity moves with time in a defined direction in space), and the action of the magnetic field on the molten metal is thus It appears as an entrainment of metal that coincides with the displacement of the magnetic field in its sense and direction.

In casting flat products, the liquid metal is generally accompanied by a linearly moving magnetic field, the so-called moving magnetic field, and undergoes a horizontal translational motion parallel to the broad side of the product.

The moving magnetic field is created by a polyphase linear inductor, which is located as close as possible to the slab to maximize the electromagnetic coupling with the slab.

For this purpose, an inductor can be installed inside the support roll after the support roll in a room called “box stirrer” or in a room called “stirrer roll” or “in-roll stirrer” in the secondary cooling zone (this Support rolls are made hollow for the purpose).

Both approaches have been on the market since the early 1980s and have been used from the start bar to improve the internal integrity of the cast metal. This is because, by stirring, natural crystal growth of the "resin phase" type from the outside towards and near the centerline of the product hinders the benefits of the development of finer non-directional solidification structures called "isometric" structures.

This, in turn, leads to a reduction in central porosity and a simultaneous reduction in macrorosegregation in the axial direction (see European Patent 0 097 561). This improvement in internal dryness is essential for steel grades that are rolled at low strain rates to be heavy plate products.

In order to achieve optimal agitation with respect to the internal dryness of the product obtained in the secondary cooling zone of the steel slab casting machine, at least two agitations, ie stepwise agitation, are required, not only in a single local position but also over the metallurgical length. I found that.

The aforementioned European patent 0 097 561 B2 describes a method for continuously electromagnetically stirring a cast steel slab, wherein a number of moving magnetic fields generated by a pair of staged stirrer rolls are of metallurgical length, ie 1 to 2 meters. Over the space between the upper and lower pairs. Thus, based on one set of four stirrer rolls in total, the pair of stirrer rolls closest to the mold is located about 5 to 7 meters below the free surface of the liquid metal in the mold and at the bottom of the solidification well. The second pair of stirrer rolls located as close as possible is located 4-6 m from this bottom. The power source of the roll is further regulated so that the magnetic field created by the upper pair moves in the opposite direction to the power source of the magnetic field created by the lower pair.

According to the teaching, the stirrer roll is installed in the region of the secondary cooling zone, called the "lower compartment" of the casting machine. The stirrer rolls are usually replaced by support rolls provided at this point, so in this secondary cooling zone they have an outer diameter, in particular an outer diameter which is approximately the same or in all cases the diameter of the adjacent rolls, and typically has a diameter of at least 230 mm. Have

Stepwise stirring may in principle be carried out with two boxed stirrers, but in general with stirrer rolls. However, box-type stirrers are much more expensive because they require about five times the power due to the distance of the stirrer from the slab surface, so the stepwise stirring into the box-type inductor is enormously expensive.

Electromagnetic stirring in secondary cooling zones has been widely used around the world to improve the quality of heavy plate products, but was replaced in the 1990s with a competitive technique called "light mechanical reduction". This can, in fact, be compared to a light rolling step in the casting machine, forcing the solidifying surfaces on each side of the wide side of the slab to approach each other to reduce the central porosity and central segregation more effectively than by electromagnetic stirring.

As a result, electromagnetic agitation in the secondary zone is no longer practical at present except in the case of stainless steel and silicon steel, and other metallurgical purposes. This is a particular problem with continuous casting of these steel grades where surface defects of the "roping" or "ridging" type exhibited by corrugated surfaces are often found for products obtained after rolling or drawing. Because there is. Such surfaces are visually unsatisfactory for stainless steel and for silicon steel, creating a dense problem in the manufacture of laminates for transformers or motor yokes.

However, it is already known that this weaving and fungus problem can be eliminated if the slab has a solidification structure with a very high portion, ie at least about 50% of the equiaxed type. Theoretically, such results can be obtained by casting metals at extremely low stages of superheat, but in practice this is not possible with continuous casting and therefore electromagnetic stirring is required to quickly extract this superheat.

In contrast to heavy plate products, where porosity and axial segregation should be minimized, the aim here is to maximize the degree of equiaxed solidification. This is why the stirrer must be lifted towards the top in the secondary cooling zone in order to get as close as possible to the mold of section 0 of the casting machine.

It will be considered that “compartment 0” is a compartment that receives the cast product directly leaving the lower roll of the mold. This defines a particular part of the metallurgical length that extends over a distance of about 3-4 m from the mold outlet. This part, formed by a rigid set of small diameter (typically about 150 mm) support rolls, is considered particularly important by the casting machine manufacturer. This relates in particular to the small spacing between the contacting edges and the regularity of the mechanical support for the slab, while its relatively thin solidified metal shell is subjected to two successive continuum due to the high ferrostatic pressure at this point. There is a risk of expansion in the space between the mechanical support rolls.

Therefore, electromagnetic agitation by a box-type inductor located behind this support roll is proposed, while including a discontinuity in the spacing of the support rolls in the installation of a substantially larger diameter stirrer roll is not necessary for the roll supporting the slab in section 0. It is to avoid local deformation of regularity and small spacing.

However, box-type agitation requires that any metal structure present between the inductor and the slab be made of nonmagnetic steel so as not to form a screen in the magnetic field in which it operates. This includes compartment 0, which is modified when introducing stirring in existing casting machines, or specially designed compartment 0, which is more expensive when making new casting machines. Also, despite the small diameter of about 150 mm of the support roll in compartment 0, the distance between the slab and the box-shaped inductor can be reduced to 270 below 250 mm due to the mechanical structure behind the support roll supporting the middle bearing of this roll. none. As already explained above, the distance imposed between the inductor and the cast product greatly reduces the electromagnetic coupling between the two and requires a large increase in power as a compensation.

In the case of stainless steel and silicon steel, the state of the art includes: (i) local agitation in section 0 of the casting machine to obtain an equiaxed zone width that is about 50% or more of the slab thickness; (ii) the use of a boxed inductor behind a small support roll so as not to locally deform the diameter and position of the roll; (iii) consequently, limiting the agitation to a single non-step agitation operation due to cost concerns, although stepwise agitation results in better results; And (iv) the impossibility of changing the position of the stirrer for a given compartment 0.

It is an object of the present invention to propose a solution which does not have the disadvantages mentioned above in carrying out electromagnetic stirring in section 0.

For this purpose, one subject of the present invention is a method of continuous casting of flat metal products using electromagnetic agitation by a magnetic field moving across the width of the broad side of the cast product, which has a mainly equiaxed solidification structure ( That is, for the purpose of obtaining a cast product), over at least 50% of the width of the slab, said electromagnetic agitation is inserted between a set of support rolls constituting section 0 and at least two stirrer rolls which generate a magnetic field moving in the same direction. Is performed in section 0 of the secondary cooling zone of the casting machine.

This predominantly equiaxed internal solidification structure improves the behavior of the metal during rolling and prevents weave or ridge type defects, whereby the method according to the invention is particularly suitable for continuous casting of flat products made of ferritic stainless steel or silicon steel. It becomes suitable. However, the method can of course also be applied to carbon steels in general.

In addition to the effect on the solidification structure of the slab, the agitation in section 0 is advantageous in that it allows better control of the overheating of the metal during casting.

By using a stirrer roll in section 0 that replaces a substantially smaller diameter support roll, the method according to the invention maximizes the number of busbars in contact with the surface of the slab during casting to maximize the mechanical support of the slab ( This means that the discontinuity in the support roll diameter, which implies the discontinuity of the slab support, will inevitably lead to excessive expansion of the slab, which is the cause of the cracks observed in the solidified shell.) Contrast with practice.

The present invention, in industrial operation, contrary to the principles of the person skilled in the art of continuously casting long cross-section products, replacing the small support roll with an agitator roll without damaging the continuous casting process in any way and in particular without creating cracks. As a result, it was found that by introducing a discontinuity in the support of the slab, an inductor can be introduced in section 0 of the casting machine. Obviously, even if the slab expansion is locally higher, preventing the formation of cracks appears to be an effect of the movement of the liquid metal caused by the agitation.

According to the basic variant of the invention, the stirrer rolls are used in pairs.

To facilitate concentration of the magnetic field across the slab, the two stirrer rolls that make up the pair will be placed at the same level, facing each other, each being on the broad side of the slab. However, the stirrer rolls will be placed side by side to facilitate an increase in the length of the action of the agitation along the casting direction, with one directly adjacent on top of the other to support the same broad side of the slab.

According to another variant, when very high stirring forces are required for a particular application, two neighboring pairs of stirrer rolls are used, so that the two rolls are placed side by side one over the other, with two broad sides of the slab Located at each of the.

According to a preferred variant, the diameter of the stirrer rolls will be chosen such that the two stirrer rolls placed side by side almost replace three successive support rolls. Due to this important arrangement, any position of the supporting rolls (positions on each side of the slab) except three consecutive rolls (replacement rolls) can be kept unchanged and the total length of the section 0 can be kept constant. Even in the above-described embodiment, the same section 0 can be introduced.

For example, for a 150 mm diameter support roll (i.e., with a 30 mm free gap between two rolls) disposed at a center-to-center spacing of 180 mm, a gap of 3 x 150 mm + 2 x 30 mm, ie 510 mm is 2 x diameter It will be used to install two stirrer rolls with D + 30 mm = 510 mm, thus D = 240 mm.

The choice of 240 mm diameter of the stirrer rolls in the selected example thus allows for the installation of two pairs of stirrer rolls grouped together without changing the opposite pairs or side-by-side pairs, or the length of compartment 0 and other conventional support rolls. Allows division 0 to be modified.

The selection of the outer diameter D of the stirrer roll is approximately by the formula 2D + e = 3d + 2e (e is the spacing between the two rolls, which is approximately the same for the stirrer roll and the support roll, d is the diameter of the support roll) Will be given.

Since the operator of the continuous casting machine can easily optimize the metallurgical results according to the choice of a pair of stirrer rolls or two grouped pairs facing or side by side, the flexibility in the selection of the stirring configuration is one particularly important aspect of the present invention. to be.

Another subject of the invention is a facility for the continuous casting of flat products, which comprises a mold and a secondary cooling zone downstream of the mold, wherein section 0 of the secondary cooling zone comprises the ordinary supports that make up this section. At least two stirrer rolls inserted between the rolls.

According to a preferred embodiment, the diameter of the stirrer roll is such that 2D + e = 3d + 2e can be installed so that two stirrer rolls facing each other or side by side or four stirrer rolls grouped in pairs on each wide side can be installed. Is selected accordingly.

The stirring effect was found to be strongly dependent on the position of the stirrer in section 0, ie the distance between the mold and the stirrer. The optimal location will be selected according to the solidification profile of the slab, which solidification profile itself depends on the casting conditions such as casting speed, cooling strength, superheat of the steel and the like. For example, when the casting speed is low, it would be desirable to install a stirrer in the highest portion of section 0. In this position, after selecting a position to fit the stirrer in the compartment and fitting compartment 0 (where it is rarely a matter whether it is a box-type stirrer or stirrer roll), the coagulation profile remains unchanged and the selected position It will be absolutely necessary to reproduce the same casting conditions so that they remain correct. Thus, flexibility in modifying casting parameters may be lost, or it will be necessary to change section 0 once again.

Thus, according to one advantageous embodiment of the plant, the structure of section 0 is designed to be able to change the position of the stirrer roll while maintaining the same section 0.

For this purpose, the standard main support beam, in which each roll is supported and its bearings are properly fixed, is no longer used, but each time three support rolls are grouped together on a support baseplate, which baseplate itself is the main support. Supported and fixed to the beam. The height of the baseplate is equal to the excess height of the bearing against the support roll and the stirrer roll with its bearing.

Such construction of removable support baseplates, which are securely fixed to the main beam, may be characterized by a pair of larger diameter rolls, a pair of agitator rolls, depending on whether a pair of agitator rolls facing or side-by-side or two grouped pairs are used. Or stirrer rolls and dummy rolls of the same diameter provide structural flexibility to replace any three support rolls.

Since the operator of the continuous casting machine can easily optimize the position of the stirrer roll in compartment 0 when modifying its casting conditions, the flexibility of the location selection and the ease of installation are one aspect of the invention that may prove particularly important. .

Other features and characteristics of the present invention will become more apparent from the following detailed description of some embodiments provided by the drawings, and with reference to the accompanying drawings.

1A and 1B are schematic perspective views of the top of a continuous casting machine having sections of a mold and a secondary cooling zone.

2A and 2B show the selection of diameter D for the stirrer roll and the dummy roll according to the diameter d of the support roll and the spacing therebetween.

3a to 3e show a pair of support rolls of section 0, in which four stirrer rolls of larger diameter are grouped together, and one of five stirring configurations that can be achieved in section 0, respectively.

4 shows a design of section 0 with its support structure divided into a baseplate and a main beam according to the invention.

1 schematically shows a facility for the continuous casting of steel slabs, which comprises a mold 10 and a secondary cooling zone 12 downstream thereof. Consists of assembled plates, the mold 10 in which the wide plate of the mold is vigorously cooled by the circulation of water over its outer surface defines a long, rectangular cross-section casting passageway, which is formed on the as-molded slab to be manufactured. Give shape. The mold is supplied with molten metal from above by an immersion nozzle (not shown), and the slab preform 14 partially solidified on the outer surface is continuously extracted from the mold 10. Upon exiting the mold, the slab 14 enters the secondary cooling zone 12 where the slab is guided and supported by a support roll while being cooled by a water jet (not shown).

FIG. 1A shows a portion of the secondary cooling zone 12 that normally corresponds to the regions called “compartment 0” and “compartment 1”, while FIG. 1B also shows a “compartment 2”, ie a metallurgical of about 7-8 m. Note the length. In this secondary cooling section 12, the slab 14 only partially solidifies and thus still comprises a somewhat thin solidified shell 16 and a wide liquid core 18.

As a reminder, section 0, indicated as “20” in FIG. 1, corresponds to a secondary cooling zone 12 extending just below the mold 10 over a length of about 3 m. Section 0 typically includes a small diameter guide roll 22 and the diameter of this roll is generally about 150 mm. Typically, there are eight to sixteen guide rolls on each of the broad sides of the slab.

Sections 1, 2, etc., thus typically correspond to secondary cooling zones downstream of section 0 with larger diameter guide / support rolls 23. For example, compartments 1 and 2 each extend over a distance of about 1.5-2 m following compartment 0, respectively.

Figure 1a shows a pair of stirrer rolls 24, side by side in a position relatively close to the mold and used to stir stainless steel and silicon steel, whereby a large isometric, having a thickness greater than 50% in accordance with the present invention. It becomes possible to manufacture the slab 14 which has a solidification part.

In contrast, FIG. 1B shows stepwise stirring with a pair of stirrer rolls 24 in a section 1 and a second pair 24 in a section 2 at a relatively low position normally used for heavy plate steel.

1b shows a modern casting machine, in which the mold is provided with a foot roll, the mold and the first part of the compartment 0 are straight and vertical, the compartment 0 is relatively long, and the secondary cooling zone curvature is at the bottom of the compartment 0. Begins.

1A shows a casting machine of spherical design with a shorter overall curved section 0. Casting machines of this type often have curved molds.

As is known, the stirrer roll is schematically a guide / support roll made tubular to contain a moving field electromagnetic inductor, so that the inductor is located very close to the slab. The stirrer rolls typically have a diameter larger than 230 mm and are therefore substantially larger than the diameter of the rolls of compartment 0. However, the detailed design of this stirrer roll does not form a specific part of the present invention and is well known in the art and will not be described in detail here. For a more detailed description of their designs and techniques, in particular with regard to inductors, reference may be made to EP 0 053 060, for example.

Section 0 agitation is used at a location that includes a steel part that is primarily liquid in the thickness direction of the slab. This makes it possible to achieve mainly equiaxed solidification, where the solidification thickness corresponds to at least 50% of the thickness of the slab, the equiaxed central zone being bounded by two columnar (or dendritic) zones. The predominantly equiaxed crystalline structure avoids the roping and rigging problems observed after rolling with steel grades of ferritic stainless steel or silicon steel type.

By using stirrer rolls instead of boxed stirrers (not shown), the inductor can be placed closer to the slab, resulting in better electromagnetic coupling, reducing power requirements by about 5 factors and thus significantly less agitation Can be achieved.

This is because the cost of a single boxed stirrer is generally more expensive than the cost of four stirrer rolls, which results in low cost gradual agitation (two stirrer rolls in compartment 0 followed by two stirrer rolls in compartment 1 or 2). Yes) can be used. Stepwise agitation gives better results than a single stirrer, because stepwise agitation results in more extensive motion of the liquid steel in the secondary cooling zone, resulting in between the hotter and colder rivers at the top of the secondary cooling zone. Because it provides a better heat exchange of and better avoids overheating of the steel. Therefore, while a better metallurgical result is obtained, work flexibility in casting is obtained because it can tolerate the steel to be cast with greater overheating.

2 shows the difficulty of inserting a substantially larger diameter roll into compartment 0. As an example, a support roll 22 having a diameter of 150 mm and an intercenter spacing of 180 mm was selected. In order to insert a single stirrer roll 24 into a pair of support rolls 22, two support rolls 22 must be removed, thereby increasing the support spacing from 180 mm to 270 mm (FIG. 2A). Of the 180mm gaps, two 270mms are prohibited due to slab expansion. In a structure configured such that a pair of stirrer rolls face each other, this gap can be reduced from 270 mm to 225 mm. This may be acceptable in terms of slab expansion, but it is required to reduce the length of section 0 by 2 x (270-225) = 90 mm, which is necessary for existing casting machines because of the need to redesign the entire secondary cooling zone. It may be impossible. 90 mm can still be distributed across all support rolls, but this may require recalibration of all rolls, and thus a new section 0 needs to be manufactured. In all cases, it may be limited to the configuration of a pair of opposing stirrer rolls.

If you want to use a pair of stirrer rolls in opposite or side-by-side configurations, or have the freedom to use two pairs of rolls grouped together if a special application requires additional stirring power, a suit as shown in FIG. 2B It is necessary to insert two stirrer rolls 24 into the supporting rolls 22.

Thus the diameter is 2D + e ≒ 3d + 2e (D and d are the diameters of the stirrer roll 24 and the support roll 22, respectively, e is the gap between the rolls, and is almost the same for the stirrer roll and the support roll) It should be selected using the equation In the selected example, a diameter D of 240 mm is obtained for the stirrer roll. The slab support spacing will vary continuously from 180 mm to 225 mm, 270 mm and then to 225 m and 180 mm, which is better for slab expansion than the series of 180, 270, 270 and 180 mm of the example shown in FIG. 2A.

In summary, by selecting the diameter D of the stirrer roll according to the diameter d of the support roll using the above formula and by inserting four stirrer rolls of this diameter D, the flexibility to change the stirring configuration having the same compartment 0 and Together, a more favorable situation regarding slab expansion will be obtained.

FIG. 3 is a schematic view of a section 0 structure composed of a large support beam 26 located on each side of the wide side of the slab and supporting the end rolls or dummy rolls 25 of the support roll 22 and the stirrer roll 24. Shows. Although this is not shown in FIG. 3, the support rolls 22 can be further supported by intermediate bearings in one or two positions along their length (see FIG. 4). 3 shows a section 0 portion of a straight vertical shape, but it is understood that this portion may also be bent.

3 shows five stirring configurations that can be achieved with the same compartment 0: stirring by a pair of stirrer rolls 24 facing each other in two different positions (FIGS. 3A and 3B); Stirring by a pair of stirrer rolls side by side (FIGS. 3C and 3D); And stirring by two pairs of stirrer rolls grouped together (FIG. 3E). The four first configurations shown in FIGS. 3A-3D use a pair of dummy rolls 25 of the same diameter in addition to the pair of stirrer rolls 24. In this way, magnetic field agitation, which is concentrated across the thickness of the slab (FIGS. 3A and 3B) or reduced across the slab but applied over a longer length (FIGS. 3C and 3D), or extremely strong agitation (FIG. 3E) Very large flexibility is achieved in the choice of.

3 also shows that the support beam 26 for the bearing of the roll has to be reworked with a notch 27 at the insertion point of the larger diameter D roll, once the position of the stirrer roll (and the dummy roll) It can't be modified anymore.

Finally, FIG. 4 shows a number of baseplates 28 and (ii) baseplates 28 in which the main support beam 26 serves to (i) group each of the three support rolls 22 together. And a design of a compartment 0 structure divided into a main beam 29, which serves to fix and fix it.

If the length of the baseplate matches the space without the baseplate being lifted by two stirrer rolls or dummy rolls, the position of the baseplate is easily relative to the baseplate by removal / reinstall without the need to rebuild a new compartment 0. Can be changed. Thus, when the working conditions are modified to change the casting conditions and in particular the casting speed, it will be possible to re-adopt the location of the electromagnetic stirring and optimize the metallurgical results.

It should be noted that the baseplate 28, like the surface of the main beam 29, is shown straight but may be bent. It should also be noted that the height of the baseplate 28 is at least equal to the depth of the notch 27 (equivalent to the height difference of the roll / bearing assembly between the stirrer roll 24 and the support roll 22). The same is true when the stirrer roll / dummy roll is fixed directly to the main beam 29. The stirrer rolls / dummy rolls also become larger if installed in the baseplate.

It is a matter of course that the present invention is not limited to the examples described above and extends to the many variations and equivalents provided that the definition given by the following claims is respected.

Claims (13)

Molten metal is poured into the mold 10 and the externally solidified cast metal product 14 is continuously extracted from the mold and immediately downstream of the outlet of the mold 10 using a pair of support rolls 22. In a secondary cooling zone 12 provided with "compartment 0" 20 extending over 3 to 4 m, In order to obtain a cast product having a solidified structure of equiaxed type domination, the cast metal product 14 is at least two stirrer rolls 24 present in the set of support rolls 22 and generating a magnetic field moving in the same direction. In the continuous casting method of a flat metal product which is electromagnetically stirred by a moving magnetic field by The stirrer roll 24 is located in the “compartment 0” 20, The diameter "D" of the stirrer roll 24 is the formula: 2D + e ≒ 3d + 2e ("d" is the diameter of the support roll 22 and "e" is the free spacing between two consecutive rolls. ), The "compartment 0" 20 is deformed to insert four rolls of diameter "D" comprising at least two stirrer rolls and at most two dummy rolls into a set of support rolls 22, wherein the four Rolls are positioned as a group, and two rolls are positioned on each wide side of the cast metal product (14). 2. A method according to claim 1, wherein the two stirrer rolls (24) are positioned opposite each other, each of which is present on the broad side of the cast metal product (14). 2. A method as claimed in claim 1, wherein the two stirrer rolls (24) are located adjacent and parallel to each other in the same broad face of the cast metal product (14). 2. A method according to claim 1, wherein two pairs of agitator rolls (24) are used as a group, each pair being on the broad side of the cast metal product (14). delete 5. The method of claim 1, wherein the cast metal product (14) is stainless steel or silicon steel. 6. delete A secondary cooling zone 12 formed of a continuous compartment consisting of a mold 10 and several sets of support rolls, one of which extends over 3-4 m immediately downstream of the outlet of the mold; A facility for the continuous casting of flat metal products that are "compartment 0" (20), “Compartment 0” 20 includes at least two stirrer rolls 24, The diameter "D" of the stirrer roll 24 is the formula: 2D + e ≒ 3d + 2e (where "d" is the diameter of the support roll 22 and "e" is the free spacing between two rolls). Satisfied, The “compartment 0” 20 is deformed to allow insertion of four rolls of diameter “D” comprising at least two stirrer rolls and at most two dummy rolls 25 into a set of support rolls 22. Wherein the four rolls are located as a group, and two rolls are located on each broad side of the cast metal product (14). 9. A facility according to claim 8, wherein the two stirrer rolls (24) are positioned opposite each other, each of which is on a broad side of the cast metal product (14). 9. A facility as claimed in claim 8, wherein the two stirrer rolls (24) are located adjacent to each other and are for continuous casting of flat metal products side by side in the same broad face of the cast metal product (14). 9. The installation according to claim 8, wherein two adjacent stirrer rolls (24) are located as a group, each of which is on a broad side of the cast metal product (14). delete 9. A support according to claim 8, wherein at least one set of three support rolls 22 located below a group of four rolls 24, 25 of diameter "D" is supported and fixed to the intermediate baseplate 28. Grouped together, the intermediate baseplate itself is supported by the main beam 29, and the position of the group of four rolls 24, 25 of diameter " D " A facility for continuous casting of flat metal products, characterized in that they are removably secured for exchange with positions.

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