DE102015223787A1 - Method and device for producing a metallic strip by endless rolling - Google Patents

Abstract

The invention relates to a method for producing a metallic strip by endless rolling, in which first in a casting machine (2) cast a slab (1) and this is then rolled continuously in a rolling train (3) with at least one roll stand, wherein the material of the slab (1) is cooled in the region of a strand guide (4) by spraying a cooling medium (5) by means of a number of cooling devices (6), each cooling device (6) having a number of spray nozzles (7) running in the direction transverse (Q) to Conveying direction (F) are arranged side by side and over which the cooling medium (5) is applied to the slab (1). In order to achieve a higher slab and thus strip quality, the invention provides that at least one of the cooling devices (6) is operated so that only a number in the middle region (M) of the slab (1) arranged spray nozzles (7) cooling medium ( 5) is applied to the slab (1), while on the in the edge region (K) of the slab (1) located spray nozzles (7) no or only to a lesser extent cooling medium (5) on the slab (1) is applied, wherein in the region of the strand guide (4) and / or in the region between the strand guide (4) and the rolling train (3) preferably the edge region (K) of the slab (1) is protected against cooling by means of a thermal insulation (8) and / or the Slab (1) along a compensation line between the casting machine (2) and the rolling train (3) in its edge region (K) is heated. Furthermore, the invention relates to a device for producing the tape.

Description

The invention relates to a method for producing a metallic strip by continuous rolling, in which a slab is first cast in a casting machine and then continuously rolled in a rolling train with at least one roll stand (it can also be endlessly pre-rolled and the strip rolled discontinuously), wherein the casting machine comprises a strand guide, in which the cast slab is fed in the conveying direction in the rolling line, wherein the material of the slab is cooled in the strand guide by spraying a cooling medium by means of a number of cooling devices, each cooling device having a number of spray nozzles, the in the direction transverse to the conveying direction are arranged side by side and over which the cooling medium is discharged onto the slab. Furthermore, the invention relates to a device for producing the tape.

A casting machine usually has to produce different material qualities. Here, soft carbon steel is cast at a high speed and designed based on a casting machine length. When casting high strength materials (such as microalloyed steels and high carbon steels) or silicon steels, the casting speed is reduced for quality reasons. This leads to a solidification further within the caster.

In order to reduce the temperature losses for these high-strength materials, for example, it is from the EP 2 809 465 B1 known to arrange insulation elements in the rear region of the casting machine (ie in the outlet area of the same) and behind the casting machine. This reduces the temperature losses and thus the energy requirement and improves the slab quality, in particular in a subsequent forming, for example, in an endless casting rolling mill.

From the Contributed by Jean-Pierre Briat et al. "State of the art and developments in near-net-shape casting of flat steel products" (EU Report 16671, Final ECSC report 03/1995; ISBN 92-827-5639-4) It is known that an inductive heating before forming (see page 32 of the report, paragraph 3) or at a first stand after casting and an edge Heater and a rotary descaler system (see page 37 of the report , 3rd paragraph) are used. A disadvantage of such inductive heating, however, that it is very expensive and costly in terms of investment, maintenance and energy consumption.

Other solutions reveal that WO 89/11363 A1 , the DE 690 07 240 T2 and the DE 10 2010 022 003 A1 ,

The invention is therefore based on the object, a generic method further so that it is possible with little effort to improve the slab or strip quality, especially in the edge region.

The solution of this problem by the invention is characterized in that at least one of the cooling devices is operated so that only a number of arranged in the center region of the slab spray nozzles cooling medium is applied to the slab, while on the located in the edge region of the slab spray nozzles no or Cooling medium is discharged onto the slab only to a reduced extent, the entire slab, preferably only the edge region of the slab, being protected against cooling in the region of the strand guide and / or in the region between the strand guide and the rolling train by means of thermal insulation and / or Slab is heated along a balancing section between the caster and the rolling mill in its edge region.

Preferably, at least at one location along the conveying direction of the slab, the mean temperature in the edge region of the slab is kept higher by at least 20 K, preferably by at least 100 K, compared to the mean temperature in the center region of the slab.

The edge region of the slab is preferably kept away from splashed-on cooling medium or in reduced cooling effect over a range between 40 and 150 mm away from the lateral slab end.

The injection zone width is preferably divided into narrow width sections which are preferably acted upon separately with cooling medium, preferably between 50 mm and 300 mm, particularly preferably between 50 mm and 100 mm, in order to be able to optimally adapt the active water quantity to different slab widths.

A further embodiment provides that a temperature increase between the temperature of the slab in the edge region and the temperature of the slab in the central region from the beginning of the solidification of the slab until the end of the solidification of the slab is preferably carried out continuously.

L_S:

Länge der Ausgleichsstrecke in m,

H_B:

Dicke der Bramme in mm,

v_B:

Gießgeschwindigkeit der Bramme in m/min,

k:

dimensionsbehafteter Koeffizient: k = 0,10.

The slab is thereby preferably between the casting machine and the rolling train to equalize the temperature between the central region the slab and the edge region of the slab is guided along a compensating section with a length which results in: L _S ≥k · (H _B ) ^0.5 · v _B With:

L _S :

Length of the compensation section in m,

H _B :

Thickness of the slab in mm,

v _B :

Casting speed of the slab in m / min,

k:

dimensioned coefficient: k = 0.10.

This provides the distance (and thus the time) needed for the temperature increase at the edge or side and the temperature compensation. The equation reflects the problem of high mass flow.

Preferably, however, the compensation path is not longer than 120%, at most 200%, of the above minimum value.

Alternatively, the compensation path length may also be set so that a single slab for maximum length batch rolling takes place in the area between the caster and the first stand and there is sufficient head-to-head clearance for handling.

Accordingly, therefore, a distance between the casting machine and the first stand is present, so that a temperature compensation (.DELTA.T <80 ° C) within the slab in the thickness and / or width direction in front of the rolling stand by means of a sufficient distance with partial use of Dämmhaubenstrecken and by heat conduction set inside the slab.

The heating of the slab is preferably carried out within a thermal insulation.

Depending on the cast product or depending on the set mass flow at least one segment of the casting machine can be replaced by lateral displacement by a transversely to the conveyor direction sliding thermally insulated roller table during a casting break.

The apparatus for producing a metallic strip by endless rolling, comprising a casting machine for casting a slab and a subsequent thereto in the conveying direction of the slab rolling mill with at least one rolling stand, wherein the casting machine has a strand guide, in the material of the slab in the conveying direction in the direction of the mill train is performed, wherein a number of cooling devices are provided, with which the slab can be cooled in the strand guide by spraying a cooling medium, each cooling device having a number of spray nozzles, which are arranged in the direction transverse to the conveying direction side by side and on which the cooling medium on The material of the slab can be discharged, is characterized according to the invention by the fact that control means are provided to operate a at least one of the cooling devices so that only over a number arranged in the central region of the slab Spritzdü Cooling medium is discharged to the slab, while no or only to a lesser extent cooling medium is applied to the slab on the located in the edge region of the slits spray nozzles, wherein a thermal insulation in the strand guide and / or in the area between the strand guide and the rolling mill is arranged, which is designed preferably to protect the edge region of the slab against cooling and / or wherein a heating device is arranged, which is adapted to heat the slab along a balancing section between the caster and the rolling mill in its edge region.

The zone widths or distances of the spray nozzles in the width direction of the slab are preferably between 50 and 300 mm, preferably between 50 and 100 mm. This makes it possible to positively influence the temperature distribution over the width.

The thermal insulation in the direction transverse to the conveying direction may be arranged displaceably.

In order to equalize the temperature between the center region of the slab and the edge region of the slab between the casting machine and the rolling train, in turn, there is preferably provided a compensating section having the length indicated above.

Laterally next to at least one segment of the strand guide or the casting machine can be arranged transversely to the conveying direction sliding thermally insulated roller table with thermal insulation.

The proposed measures in particular the slab and thus the strip quality is improved at the edge. The invention is based on the recognition that a normal cooling in the rear region of the casting machine and during the subsequent onward transport up to the first rolling stand has a particularly negative effect on the edge. To prevent this, it is provided that within the casting machine by targeted switching off or reducing the segment cooling in the area close to the slab edges, these are kept warmer.

In particular, the slab edge region is preferably kept in the range between 40 to 150 mm from the edge to the solidification by at least 20 K, preferably at least 100 K, warmer than the slab center.

As a result, an optimal adaptation of the active spray nozzles is given to different slab widths.

The proposed measures, both with regard to the procedure and the design of the corresponding device result in addition to the temperature increase in the edge region of the slab or the belt compressive stresses on the edge, which have a positive effect with respect to edge cracking. After the range of solidification and / or only from behind the casting machine can be provided to cool the slab on the top and bottom and on the slab edges as optimally as possible until shortly before the first rolling mill less, to keep warm or to heat the edge.

Descaling of the slab, for example, before the first inline scaffold is optionally optionally dispensed with in high-strength materials; this area can be thermally insulated.

The advantageous effect according to the invention of the overheating of the edge in the solidification region (in the region near the edge) and the subsequent thermal insulation of the slab as a whole or alternatively only at the slab edges and a temperature compensation or a temperature increase at the slab edge leads to an increase in quality especially in the case of high-strength materials but also for soft normal steels or silicon steels.

Advantageously, the proposed solution results in an improvement of the slab or strip quality at the edge, in particular in the case of high-strength materials. In particular, slab edge cracks can be avoided during subsequent forming.

It should be noted that this is selectively and interchangeably spoken of a strand or a slab and always under the band-shaped, molded product is to be understood, which is located at the respective point of the system; Often is spoken in the casting machine of a strand, while the term of the slab is usually often needed only behind the casting machine. These terms are interchangeable here.

In the drawings, embodiments of the invention are shown. Show it:

1 schematically a cast strand or a slab, as seen in the conveying direction, wherein above the cast strand or the slab, a cooling device in the form of a cooling bar is arranged with a number of spray nozzles, wherein a solution is shown in the prior art,

2 schematically the representation according to 1 , wherein an embodiment according to the invention is shown here,

3 the progression of the slab temperature averaged over the thickness of the slab or the casting strand at the casting machine above the slab width coordinate,

4 the course of the slab temperature averaged over the thickness of the slab or of the cast strand above the slab width coordinate in the area of the casting machine and on the first inline rolling stand for different boundary conditions,

5 the view of a part of the roller table between casting machine and rolling train or the strand guide of the casting machine, seen in the conveying direction of the slab, wherein an adjustable thermal insulation is shown,

6 the side view of the end of the casting machine, wherein in this area a thermal insulation is arranged,

7 the side view according to 6 , where instead of the thermal insulation segment rollers are arranged here, and

8th seen in the conveying direction of the slab a transversely displaceable element of the casting machine, wherein either a thermal insulation or a segmented roll can be inserted into the conveying region of the slab.

In 1 First, according to the prior art, a cast strand or a slab 1 to be seen in the conveying direction F (the in 1 perpendicular to the plane) passes the strand guide a casting machine. Above the slab 1 is a cooling device in the form of a cooling bar 6 arranged, wherein the cooling device a number of juxtaposed spray nozzles 7 having. About this can be cooling medium 5 (Water) or a water-air mixture are sprayed onto the strand surface to cool it.

The cast strand 1 extends in a direction Q transverse to the conveying direction F and has a central region M in and an edge region K.

In 2 is an embodiment of the invention can be seen, which is different from the previously known only differs in that the individual spray nozzles 7 are arranged much closer to each other.

This makes it possible by activating or deactivating individual spray nozzles 7 the area of the strand 1 to define specifically in the direction of Q, either by the application of cooling medium 5 cooled or by passivation of the corresponding spray nozzles 7 remains uncooled, so the strand 1 remains warmer in the strand or slab edge region K.

In 1 and 2 are the active, ie the spray nozzles supplied with water spray 7 shown as black boxes while the passive spray nozzles 7 ' are shown as white boxes.

Accordingly, it can be seen immediately that it with the proposed solution 2 much more accurately possible, the width of the edge portion K of the strand 1 to determine the of cooling medium 5 should be kept free to here a higher temperature of the strand or the slab 1 to reach.

In both 1 and 2 only the upper strand cooling is shown; The same applies to the lower strand cooling. Segmented rollers or lines for cooling media supply are not shown in this simplified illustration.

The inventively desired overheating of the edge portion K of the casting strand or the slab 1 , ie, the temperature increase of the edge portion K relative to the central region M is advantageously increased successively from the beginning of the solidification until the end of the slab solidification. For this purpose, the segment cooling (for the entire casting machine or even only in the forward or back half of the casting machine in the conveying direction or alternately over casting machine length) can be very fine across the width to optimally set the desired effect for the different widths.

Zone widths between 50 and 300 mm and more preferably between 50 and 100 mm are provided across the width in the range of 90% from the minimum slab width to the maximum slab width in order to avoid cold slab edges.

The zones on the top and bottom as well as from roll to roll can be offset by a half (or integer) nozzle pitch. Advantageously, volume-adjustable two-substance nozzles are used as spray nozzles.

The amounts of water of the individual spray nozzles, which should remain passive, in the slab edge area and next to the slab can be reduced to zero, so that only a little nozzle cooling water or only air (to protect the nozzle) flows out. This effect can be supported by the use of dry segments in the back of the casting machine. In order to protect the nozzles and the nozzle bars, the deactivated nozzle bars can alternatively be moved or swung out of the pouring line.

In the near edge slab edge region, of course, the absolute slab edge is somewhat colder than the slab in the middle, or the average temperature over the thickness in the region, because some water flows over the edge and a two-dimensional radiation of heat occurs. By virtue of the overheated slab edge region provided according to the invention and the subsequent optionally provided optional thermal insulation, however, there is advantageously a further rise in temperature of the absolute slab edge as a result of the temperature compensation or the heat conduction from the center to the edge or lateral outer surface.

In 3 the trace of temperature T (on the ordinate) is shown across the slab width coordinate (on the abscissa), where the temperature is the slab temperature averaged over the thickness of the casting machine. CL marks the slab center and B / 2 the slab edge.

With solid line is in 3 the temperature profile shown in the prior art with a coarse arrangement of the spray nozzles 7 according to 1 results. It can be seen that the temperature drops relatively sharply in the area of the slab edge, although the spray nozzles arranged in the region of the slab edge remain passive.

In contrast, shows 3 with dashed line the course of the temperature in the production of a warmer slab edge with fine cooling zone distribution or spray nozzle arrangement according to 2 , It can be seen that now the temperature in the edge region K of the slab 1 higher.

In 4 is again the course of the said temperature T (slab temperature averaged over the thickness) over the width of the slab in the region of the casting machine and the first inline rolling stand for different boundary conditions shown.

The curve a shows the temperature distribution up to the slab edge after the solidification, namely generated by a reduced segment cooling or by switching off nozzles in the edge region. The curve b represents the temperature distribution after the solidification in the casting machine without inventive overheating of the slab edge. It can be seen that the slab edge has become significantly colder.

The curve c shows the temperature distribution up to the slab edge at the inlet of the in-line scaffold with slab edge superheated according to the invention or reduced segment cooling in the casting machine (without insulation). The curve d shows the temperature distribution up to the slab edge at the inlet of the inline scaffolding without overheating the slab edge in the casting machine (without insulation).

The temperature distribution up to the slab edge at the inlet of the inline scaffold according to the procedure according to the invention is then shown by a reduced segment cooling in the slab edge region and thermal insulation at the top and bottom of the slab or cast strand and / or the slab edges on much of the route between the solidification point and the first inline scaffolding.

The arrow f indicates the inventively achievable potential for increasing the slab edge temperature at the inlet of the inline scaffold.

The balancing section between the casting machine 2 and the first rolling stand of the rolling mill 3 can be designed as a thermal insulation section, in which the slab is enclosed. Here, a training in the form of a heated thermal insulation route is possible. Also possible is an unheated or heated thermal insulation section only in the slab edge area and / or the use of a furnace or a heater. In the case of a furnace or a heater, heating over the entire width of the slab (or even only in the edge region) may be provided, wherein an increased heating power is provided in the edge region in order to heat the edge stronger.

In 5 is shown as the slab 1 on a roller table roller 9 is promoted, wherein in the two edge regions K of the slab 1 one thermal insulation each 8th is arranged in the form of thermal insulation. This can be adjusted in the horizontal direction Q transversely to the conveying direction F, which is indicated by the double arrows. Generally, the thermal insulation 8th also be arranged fixed. However, the adjustability is preferred so that the insulation 8th can follow the slab edge. The illustrated Brammenkantendämmung reduces the temperature difference between the slab center and the edge portion K of the slab 1 , The isolation shown 8th can in the roller table area and / or in the rear area of the casting machine 2 be used.

It can also be arranged, for example, a slicer, a cold strand disposal, a tinder scrubber and other aggregates within the equalization section.

The heat-insulating region can be realized only behind the casting machine and / or also in the rear region of the casting machine in one or more segments (in the horizontal part).

Alternatively it can be provided to operate the rear of the casting machine, for example, when casting soft carbon steel with special strand segments. These strand segments are arranged transversely displaceable on a frame. When casting high-strength materials, one or two (possibly more) segments are replaced by heat-insulated roller table groups depending on the set mass flow, in which now the necessary insulated roller table groups are pushed into the production line. This exchange of complete segment groups by complete insulated roller table groups or vice versa takes place before the sprue or between two casting sequences. The roller table or the roller table frame and the segment group or the segment frame are connected to each other. Either the segments or a insulated roller table area can therefore be in the production line.

This is in the 6 to 8th shown.

In 6 is a casting machine 2 to see laterally movable segments or sliding roller table, with top, bottom and side thermal insulation 8th (Thermal insulation) is arranged in the production line. The end of the casting machine is with 10 designated. Driver rollers or roller table rollers 11 promote the cast strand or the slab 1 , The rolling mill 3 (not shown) is spaced behind the caster 2 arranged.

In 7 is the casting machine 2 shown again, where now segment roles 12 pushed into the production line.

In 8th the displaceable arrangement is shown, in which once the isolation 8th (Thermal insulation) and once alternatively the segment rolls 12 can be pushed into the production line. This is a sliding frame 13 present in the direction of the double arrow in 8th can be moved. The unused arrangement on its frame 13 is then next to the production line.

LIST OF REFERENCE NUMBERS

1

 Slab (cast strand)

2

 casting machine

3

 rolling train

4

 strand guide

5

 cooling medium

6

 Cooling device (chilled beam)

7

 nozzle

7 '

 passive spray nozzle

8th

 thermal insulation

9

 Roller conveyor roll

10

 End of the casting machine

11

 Driver roll / roller conveyor roll

12

 segment role

13

 sliding frame

F

 conveying direction

Q

 Direction horizontally and transversely to the conveying direction

M

 Center area of the slab

K

 Edge area of the slab

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2809465 B1 [0003]
• WO 89/11363 A1 [0005]
• DE 69007240 T2 [0005]
• DE 102010022003 A1 [0005]

Cited non-patent literature

• Contributed by Jean-Pierre Briat et al. "State of the art and developments in near-net-shape casting of flat steel products" (EU Report 16671, Final ECSC report 03/1995; ISBN 92-827-5639-4) [0004]

Claims (13)

Method for producing a metallic strip by endless rolling, in which first in a casting machine ( 2 ) a slab ( 1 ) and then continuously in a rolling mill ( 3 ) is rolled with at least one roll stand, wherein the casting machine ( 2 ) a strand guide ( 4 ), in which the cast slab ( 1 ) in the conveying direction (F) in the direction of rolling mill ( 3 ), wherein the material of the slab ( 1 ) in the field of strand guidance ( 4 ) by spraying a cooling medium ( 5 ) by means of a number of cooling devices ( 6 ) is cooled, each cooling device ( 6 ) a number of spray nozzles ( 7 ) which are arranged in the direction transversely (Q) to the conveying direction (F) side by side and via which the cooling medium ( 5 ) on the slab ( 1 ), characterized in that at least one of the cooling devices ( 6 ) is operated so that only over a number in the central region (M) of the slab ( 1 ) arranged spray nozzles ( 7 ) Cooling medium ( 5 ) on the slab ( 1 ) is applied while in the edge region (K) of the slab ( 1 ) located spray nozzles ( 7 ) no or only to a lesser extent cooling medium ( 5 ) on the slab ( 1 ), whereby in the field of strand guidance ( 4 ) and / or in the region between the strand guide ( 4 ) and the rolling mill ( 3 ) the entire slab ( 1 ), preferably only the edge region (K) of the slab ( 1 ), by means of a thermal insulation ( 8th ) is protected against cooling and / or the slab ( 1 ) along a balancing section between the casting machine ( 2 ) and the rolling mill ( 3 ) is heated in its edge region (K). A method according to claim 1, characterized in that at least at one location along the conveying direction (F) of the slab ( 1 ) the average temperature in the edge region (K) of the slab ( 1 ) relative to the mean temperature in the middle region (M) of the slab ( 1 ) is kept at least 20 K higher, preferably by at least 100 K. Method according to claim 1 or 2, characterized in that the edge region (K) of the slab ( 1 ) over a range between 40 and 150 mm away from the side of the slab, free of sprayed cooling medium ( 5 ) or kept in reduced cooling effect. Method according to one of claims 1 to 3, characterized in that the injection zone width in preferably be acted upon separately with cooling medium narrow width sections, preferably between 50 mm and 300 mm, more preferably between 50 mm and 100 mm, divided to optimum adaptation of the active To be able to carry out water quantity to different slab widths. Method according to one of claims 1 to 4, characterized in that a temperature increase between the temperature of the slab ( 1 ) in the edge region (K) and the temperature of the slab ( 1 ) in the middle region (M) from the beginning of the solidification of the slab to the end of the solidification of the slab ( 1 ) is preferably carried out continuously. Method according to one of claims 1 to 5, characterized in that the slab ( 1 ) between the casting machine ( 2 ) and the rolling mill ( 3 ) for balancing the temperature between the center region (M) of the slab ( 1 ) and the edge region (K) of the slab ( 1 ) is guided along a compensation path having a length (L _S ) which results in: L _S ≥k · (H _B ) ^0.5 · v _B with: L _S : length of the equalizing section in m, H _B : thickness of the slab in mm, v _B : casting speed of the slab in m / min, k: coefficient of dimension: k = 0,10. Method according to one of claims 1 to 6, characterized in that the heating of the slab ( 1 ) within a thermal insulation ( 8th ) he follows. Method according to one of claims 1 to 7, characterized in that depending on the cast product or depending on the set mass flow during a casting pause at least one segment of the casting machine ( 2 ) is replaced by lateral displacement by a transversely to the conveyor direction (F) displaceable thermally insulated roller table. Apparatus for producing a metallic strip by endless rolling, comprising a casting machine ( 2 ) for casting a slab ( 1 ) and a to this in the conveying direction (F) of the slab ( 1 ) subsequent rolling mill ( 3 ) with at least one rolling mill, wherein the casting machine ( 2 ) a strand guide ( 4 ), in the material of the slab ( 1 ) in the conveying direction (F) in the direction of rolling mill ( 3 ), wherein a number of cooling devices ( 6 ) are present, with which the slab ( 1 ) in the field of strand guidance ( 4 ) by spraying a cooling medium ( 5 ), each cooling device ( 6 ) a number of spray nozzles ( 7 ) which are arranged in the direction transversely (Q) to the conveying direction (F) side by side and via which the cooling medium ( 5 ) on the material of the slab ( 1 ) can be applied characterized in that control means are provided to connect at least one of the cooling devices ( 6 ) so that only over a number in the central region (M) of the slab ( 1 ) arranged spray nozzles ( 7 ) Cooling medium ( 5 ) on the slab ( 1 ) is applied while in the edge region (K) of the slab ( 1 ) located spray nozzles ( 7 ) no or only to a lesser extent cooling medium ( 5 ) on the slab ( 1 ), whereby a thermal insulation ( 8th ) in the field of strand guidance ( 4 ) and / or in the region between the strand guide ( 4 ) and the rolling mill ( 3 ) is arranged, which is formed, the entire slab ( 1 ), preferably only the edge region (K) of the slab ( 1 ), to protect against cooling and / or wherein a heating device is arranged, which is designed, the slab ( 1 ) along a balancing section between the casting machine ( 2 ) and the rolling mill ( 3 ) preferably in its edge region (K) to heat. Apparatus according to claim 9, characterized in that the zone widths or distances of the spray nozzles in the width direction of the slab ( 1 ) between 50 and 300 mm, preferably between 50 and 100 mm. Apparatus according to claim 9 or 10, characterized in that the thermal insulation ( 8th ) is arranged displaceably in the direction (Q) transversely to the conveying direction (F). Device according to one of claims 9 to 11, characterized in that to compensate for the temperature between the central region (M) of the slab ( 1 ) and the edge region (K) of the slab ( 1 ) between the casting machine ( 2 ) and the rolling mill ( 3 ) there is a compensation path having a length (L _S ) which results in: L _S ≥k · (H _B ) ^0.5 · v _B with: L _S : length of the equalizing section in m, H _B : thickness of the slab in mm, v _B : casting speed of the slab in m / min, k: coefficient of dimension: k = 0,10. Device according to one of claims 9 to 12, characterized in that laterally next to at least one segment of the strand guide ( 4 ) or the casting machine ( 2 ) is arranged transversely to the conveying direction (F) displaceable thermally insulated roller table with thermal insulation.

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