EP1601479A1

EP1601479A1 - Continuous casting and rolling installation for producing a steel strip

Info

Publication number: EP1601479A1
Application number: EP04713049A
Authority: EP
Inventors: Rüdiger DÖLL; Klaus Pronold; Albrecht Sieber
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2003-03-10
Filing date: 2004-02-20
Publication date: 2005-12-07
Also published as: WO2004080628A1; DE10310357A1; US20080135203A1; CN1758970A

Abstract

In order to produce a steel strip (1), a continuous casting and rolling installation comprises: a liquid steel storage device (2); a liquid steel charging device (3); a vertically operating casting device (5) with a revolving mold (6); a reduction device (7) with a multitude of roll pairs (8); a diverting device (9) for diverting the cast steel strip (1) into a horizontal position; a horizontally operating rolling mill (10), and; a winding device (11), which are all guided via individual technological control loops (2' to 11'). In order to adjust the technological control loops (2' to 11') in an integrated manner, the continuous casting and rolling installation additionally comprises a control system (12), which connects installation parts (2 to 11) with regard to control, operates on the basis of mathematical models (17), and which coordinates the individual installation parts (2 to 11) with regard to the interaction thereof while taking into consideration the effects of the control steps of an installation part (2 to 11) upon installation parts (2 to 11) following in the direction of mass flow.

Description

description

Casting mill for producing a steel strip

The present invention relates to a cast roll plant for producing a steel strip, with a liquid steel storage device, a liquid steel adding device, a vertically operating casting device with running mold, a reduction device with a plurality of Rollenp ^' a- ren, a deflection device for deflecting the cast

Steel strip in a horizontal position, a horizontal rolling mill and a reel device, all components are guided over individual technological control loops.

Such a casting mill is z. B. from EP 0329 639 Bl.

The object of the present invention is to further develop such a cast rolling mill so that high-quality steel strips can be produced with it in a simple manner.

The object is achieved in that, for the integrated setting of the technological control loops, the liquid-steel storage device, the liquid-steel adding device, the pouring device, the reduction device, the deflection device, the rolling mill and the reel device are connected in a control-engineering manner and operate on the basis of mathematical models Guidance system that performs the individual plant parts in terms of their interaction in coordination with each other such that the effects of the control steps of a plant part are taken into account in Massenflussrich- following plant parts. The invention is therefore based on the creation of a plant-part comprehensive control system extending from the liquid steel storage to reeling.

If the steel strip cast by means of the mold has a casting thickness between 40 and 100 mm at the exit from the mold, the steel strip has a reduced casting thickness compared to conventional continuous casting plants, so that less deformation work is done to produce the final product, ie the rolled steel strip be uss.

If the steel strip in the reduction device can be reduced to a roll input thickness of between 10 and 40 mm, in particular between 15 and 35 mm, a significant reduction of the strip thickness takes place before the actual rolling. Since this reduction takes place at high temperatures, possibly even before the solidification of the steel strip, only a small deformation work is required for this reduction. This is especially true if the steel strip in the reduction device can be reduced by at least 25% in relation to the casting thickness.

The reduction means preferably comprises an upper part in which the steel strip is reshaped and a lower part in which the steel strip retains its shape.

If the casting-rolling plant can be guided by the guidance system in such a way that the steel strip only solidifies in the reduction device, then only very little deformation work has to be done to reshape the steel strip in the reduction device. This is particularly true when the steel strip only solidifies in the lower part where it retains its shape.

The rolling mill may alternatively be a pure hot rolling mill or a hot rolling mill with a downstream cold rolling mill. In one case, the steel strip has a final thickness between 1.0 and 6.0 mm, with which it is reeled by the reel device, in the other case, the final thickness is between 0.3 and 2.0 mm.

When the steel strip in the reduction device on a

Roll input thickness is reduced, which is determined as a function of the final thickness, the reduction amount is already determined in the reduction device such that subsequent parts of the system are efficiently operated taking into account technologically advantageous boundary conditions.

If a cooling section is arranged between the rolling mill and the reel device, and the cooling section is also guided by a technological control loop and this control loop is also guided by the control system, an even more comprehensive system results, in which the cooling section can also be integrated into the holistic guide Integrated control system.

In an analogous manner, the mill is preferably preceded by a scale washer, which is likewise guided by a technological control loop, whereby this control loop is also guided by the control system.

The continuous casting of the steel strip preferably takes place by means of the cast roll mills according to the invention. The

Steel strip is immediately rolled immediately after casting, reducing and redirecting and reeled. Alternatively, however, it is also possible for an intermediate reel and a compensation furnace to be arranged between the deflection device and the rolling mill, whereby these parts of the installation are also guided by a technological control loop and this control loop is again guided by the guidance system.

Preferably, the control system includes a material model by means of which a temperature behavior of the steel or the steel strip can be modeled from the steel storage device to the reel means under path tracking, wherein the technological control circuits depending on the modeled temperature behavior of the steel or the steel strip are timely performed. Because the properties of a steel or a steel strip depend not only on its chemical composition and its mechanical treatment, but also on the temperature history.

If phase transformations of the steel or steel strip (eg liquid-solid or austenitic-ferrite) are modeled within the material model, an even better modeling takes place. It is even possible that the structural properties of the steel strip are also modeled within the framework of the material model.

When the melt temperature of the steel is measured and fed to the material model as an initial parameter, the material model works particularly well.

If behind the mold, behind the reduction device, within the rolling mill and / or behind the rolling mill, possibly also within uήd / or behind the cooling section, detects an actual temperature of the steel strip and used to adapt the material model, results in a (gradual) adjustment of Model to reality.

Usually, the individual parts of the system have locally acting devices for influencing the temperature of the steel or the steel strip. In particular, these devices are controlled by the control system associated with the technological control circuits assigned to the individual parts of the system. As a locally acting means for influencing the temperature in particular cooling, z. As with water, and (inductive) heaters in question.

Preferably, the control system determines (in addition) at least one reference variable for system component acting temperature influencing the steel or the steel strip and guides the relevant system parts according to this reference variable.

In particular, the mass flow comes into question as a reference across all plant sections. In particular, a change in the mass flow affects all immediately after one another arranged plant parts in which the steel strip is processed continuously. In the event of a change in the mass flow, therefore, all subsequent locally acting devices must be appropriately adjusted in order to ensure a constant temperature behavior of the steel strip.

In particular, in the rolling mill also cross-sectional changes come into question, which influence the transport speed of the steel strip. In this case, too, a corresponding adaptation of the subsequent system parts, in particular the cooling section, to the reduction in the cycle time caused thereby is necessary in order to continue to achieve a constant temperature behavior.

Further advantages and details emerge from the following description of an embodiment in conjunction with the drawings. This show in a schematic representation

1 shows a casting rolling mill, 2 shows a detail of FIG 1 and

3 shows a control system with subordinate technological control loops for a casting rolling mill.

According to FIG. 1, a cast roll plant for producing a steel strip 1 initially has a liquid steel storage device 2. This device 2 is usually designed as a so-called tundish. From the tundish 2, liquid steel passes via a liquid-metal addition device 3 (for example a liftable sealing plug), which is indicated only schematically, and a dip tube 4 into a casting device 5. Mirror is doing in a known manner to a few mm, z. B. regulated to + 3 mm exactly.

The casting device 5 is formed in the present case as a vertically operating casting device 5. She has one

Variety of plates 6, which are connected together to form an endless chain and run along with the cast steel strip 1. The plates 6 thus together form a revolving mold 6. From the mold 6, the steel strip 1 runs with a casting thickness dl and a bandwidth b.

The casting device 5 is arranged downstream of a reduction device 7. The reduction device 7 has a plurality of pairs of rollers 8, by means of which the steel strip 1 is guided and reduced to a roller input thickness d2.

The reduction device 7 is arranged downstream of a deflection device 9. This deflects the steel strip 1 in a horizontal position. Finally, the deflection device 9 is followed by a rolling mill 10, in which the steel strip 1 is rolled down to a final thickness d3. After rolling, the steel strip 1 is reeled by means of a reeling device 11.

A technological control loop 2 ', 3 ^r , 5', 1 ', 9 "to 11' is assigned to each of the plant sections 2, 3, 5, 7, 9 to 11. The technological control loop 2 'carries the liquid steel storage device 2 , the control circuit 3 ', the liquid steel adding device 3, etc. All components 2 to 11 are thus guided over their respective control circuit 2' to 11 '.

For integrated setting of the technological control circuits 2 'to 11' of the casting rolling mill is assigned a control system 12. The control system 12 operates on the basis of mathematical models. If necessary, the models can be implemented in neural networks, possibly also in fuzzy neuro networks. It connects the control circuits 2 'to 11' for the individual plant sections 2, 3, 5, 7, 9, 10 and 11. technically together. This makes it possible in particular, the individual plant parts 2, 3, 5, 7, 9, 10 and 11 in

Reference to their interaction in coordination with each other in such a way that the effects of the control steps of a plant component, eg. B. the reduction device 7, in mass flow direction following equipment parts, in the given example, the deflection device 9, the rolling mill 10 and the coiler 11, are taken into account.

In FIG 2, the liquid steel storage device 2, the

Liquid steel adding device 3, the casting device 5, the reduction device 7 and the rolling mill 10 again shown more clearly. In particular, the formation of the mold 6 with individual plates 6 is clearly visible.

2, the broad sides of the mold 6 consist of the plates 6. If appropriate, however, the narrow sides not visible in FIG. 2 could also be formed in this way.

The steel strand 1 produced by the casting device 5 already has the casting thickness d 1 of only 40 to 100 mm. The bandwidth b is preferably between 500 and 2000 mm. The casting and rolling system is guided by the control system 12 such that the steel strip 1 emerges from the mold 6 as a strand with a solid (solidified) strand shell 1 'and liquid strand core 1. Only in the reduction device 7 occurs a complete solidification of the steel strip 1 a.

In the reduction device 7, the steel strip 1 is reduced to the roll input thickness d2. The roll input thickness d2 is preferably between 10 and 40 mm, usually it is even ^'between 15 and 35 mm. In any case, the steel strip 1 is reduced to a roll inlet thickness d2 which is at least 25% below the casting thickness dl. According to FIG. 2, the reduction device 7 has an upper part 13 'and a lower part 13. In the upper part 13 ', the steel strip 1 is reduced in thickness, in the lower part 13 ^{Ω it} retains its shape. The leadership of the casting rolling mill by the control system 12 is designed such that the steel strip 1 solidifies only in the lower part 13 * of the reduction device 7. In the upper part 13 ', in which the steel strip 1 is formed, however, it still has the liquid strand core 1 *.

According to FIG. 3, the reduction device 7 can be arranged downstream of a single vertically operating rolling stand 7 *, here a quarto scaffolding. By means of the roll stand 7 * the strand shells are pressed together and thus weld even better. Also already done a structural transformation. The rolling stand 7 ', if it is present, preferably guided by the control unit 7' associated with the reduction device 7.

The deflection device 9 -see FIG. 1 -can have in a conventional manner so-called arc segments with guide rollers, in which the steel strip 1 is deflected into the horizontal. The deflection can also be done in other ways, in particular by the exercise of electromagnetic forces.

From the deflection device 9, the steel strip 1 according to FIG. 1 is fed directly to the rolling mill 10. Between the deflection device 9 and the rolling mill 10 while a tinder scrubber 14 is arranged. The scale scrubber 14 is usually associated with the technological control loop 10 'of the rolling mill 10, so it is also guided by this control loop 10'. As a result, the scale scrubber 14 is thus also guided by a technological control loop, namely the control loop 10 'for the rolling mill 10, this loop 10' in turn being guided by the control system 12. The rolling mill 10 can have up to 10 rolling stands. It may alternatively be designed as a pure hot rolling mill or as a hot rolling mill with downstream cold rolling mill. When the rolling mill 10 is formed as a pure hot rolling mill, the steel strip 1 is rolled down in the rolling mill 10 to a final thickness d3 of 1.0 to 6.0 mm. If the rolling mill 10 is designed as a hot rolling mill with a downstream cold rolling mill, the steel strip 1 is rolled down in the hot rolling mill to an intermediate thickness d4 1.0 to 6.0 mm, in the downstream cold rolling mill to the final thickness d3, in this case between 0 , 3 and 2.0 mm. With the final thickness d3, the steel strip 1 is then reeled by the reeling device 11.

The final thickness d3 has an influence on the roll input thickness d2. In the formation of the rolling mill 10 as a pure hot rolling mill is z. For example, the roll input thickness d2 at a final roll thickness d3 of 1.0 mm is fifteen to twenty times the final thickness d3, and at a final roll thickness d3 of 6.0 mm, six or seven times. So it lies in this case between 15 and 42 mm. In the formation of the rolling mill 10 as a hot rolling mill with downstream cold rolling mill is first based on the final thickness d3 - z. B. determined by a linear mapping according to the formula d4 = 3 d3, the transition thickness d4. The roller input thickness d2 results in this case analogously from the transition thickness d4.

According to FIG. 1, a cooling section 15 is arranged between the rolling mill 10 and the reeling device 11. The cooling section 15 is assigned a (separate) technological control circuit 15 ', from which the cooling section 15 is guided. Also, this control loop 15 'is guided by the control system 12.

In FIG. 3, the components or plant parts 2, 3, 5, 7, 9 to 11 and 15 of the cast rolling mill are again shown schematically. The associated control circuits 2 'to 11', 15 'and the control system 12 are also shown. According to FIG 3 are of the control circuits 2 'to 11', 15 'continuously -. B. with a time interval of 0.2 seconds -

Recorded actual values that are characteristic of a material flow of the steel or the steel strip 1. For example, with respect to the liquid steel storage device 2, the quantity flow, ie the mass change per unit of time, is detected. The detected inflow is communicated to a path tracker 16.

With regard to the casting device 5, the casting mirror and a withdrawal speed with which the steel strip 1 emerges from the mold 6 are detected in a known manner and transmitted to the path tracker 16. In conjunction with the known mold cross section, the material flow entering the mold 6 and leaving the mold 6 can thus be determined without further ado.

Of the other components 7, 9, 10, 11 and 15, respectively, the material speeds of the steel strip 1 are transmitted to the Wegverfolger 16.

Due to the information supplied to it, the tracker 16 is able to realize in a known manner a tracking of the steel or the steel strip 1 through the entire casting rolling mill. The result of this tracking is transmitted from the tracker 16 to the control system 12.

Among other things, the control system 12 includes a material model 17. By means of the material model 17, at least the pure temperature behavior of the steel or the steel strip 1 can be modeled. In the context of the material model 17, however, phase transitions of the steel or of the steel strip 1 (eg the solidification behavior, ie the phase transition from liquid to solid, or phase transitions within the solid phase, eg from austenite to ferrite) may also be preferred. be modeled. In this case, it is even possible that in the context of the material model 17 also structural properties of the steel strip 1 such. For example, the particle size and the microstructural be liert. This then mechanical properties of the steel strip 1 such. B. the yield strength and tensile strength determined.

In particular, in the control system 12 (or in the material model 17) so both the temperature and the microstructure development of the steel strip 1 over the entire system - from tundish 2 to reel 11 - accompanied by tracking the steel strip 1 in real time. As a result, deviations in upstream plant components, eg. B. the casting device 5, in subsequent system parts, z. B. the cooling section 15 or the deflection 7, to be corrected.

Real-time executable temperature models are known. By way of example, DE 196 12 420 A1, DE 199 31 331 A1 and DE 101 29 565 A1 as well as the earlier applications "Control method for a finishing train for rolling metal hot strip * of 15.11.2001, official file reference 101, preceded by a cooling section 56 008.7, and "modeling method for a metal * dated 06.11.2002, official file reference 102 51 716.9, called.

The material model 17 preferably also models the deformation behavior of the steel strip 1 in the rolling mill 10, including temperature effects caused thereby. Also such models are well known. For example, reference is made to the earlier application "Computer-aided determination of setpoints for profile and planarity actuators * dated 15.03.2002, official file number 102 11 623.7, and the prior art mentioned there.

For the correct modeling of the temperature behavior, the material model 17 requires a number of input variables.

First, the chemical composition of the molten steel is needed. Because of the chemical composition depend inter alia transformation temperatures and structural properties etc. from. This composition is the material model 17 either by a user or - z. B. upon detection of the feed of a steelmaking facility by the associated control circuit - fed automatically.

Then, the melt temperature, hereinafter referred to as TO, is needed. This temperature TO is detected by means of a known measuring device 18 in the liquid steel storage device 2 and fed via the control loop 2 'or directly to the control system 12 and then the material model 17 as an initial parameter. Alternatively or additionally, the melt temperature T0 could also be detected behind the liquid steel adding device 3. This is indicated by dashed lines in FIG.

The individual plant parts 5, 7, 9, 10, 11 and 15 have locally acting means for influencing the temperature of the steel or the steel strip 1. As a rule, these facilities include cooling facilities, eg. B. for spraying water on the steel strip 1 or for cooling the mold plates 6. If necessary, - in particular inductively acting - heaters may be provided. These devices are controlled via the corresponding control circuits 5 ', 7', 9 ', 10', 11 ', 15'. Their manipulated variables are also supplied to the material model 17.

On the basis of the information about the material flow, which are supplied to the material model 17 from the tracker 16, and the information about the temperature influence of the steel or the steel strip 1, the material model 17 is therefore able to control the temperature behavior of the steel or the steel strip 1 under tracking from the steel storage device 2 to the reeling device 11 to model. The technological control circuits 2 'to 11', 15 'can therefore be timed out by the control system 12 as a function of the modeled temperature behavior of the steel or the steel strip 1. In particular, the locally acting the devices for influencing the temperature of the steel or steel strip 1 via the individual plant parts 2 to 11, 15 associated technological control circuits 2 'to 11', 15 'are controlled according to the guidance by the control system 12. Also, the material hardness and the rolling temperature can be determined based on the model before piercing the steel strip 1 in a rolling stand. In particular, the material hardness depends inter alia on the rolling temperature and the thermal-mechanical pretreatment of the steel strip 1. The material hardness can be used in particular for determining the

Springing of the rolling stand and their compensation are used.

As can also be seen from FIG. 3, behind the core 6, behind the reduction device 7, within the

Rolling mill 10, behind the rolling mill 10 and within and behind the cooling section 15 actual temperatures Tl to T6 of the steel strip 1 detected and fed to an adapter member 19. The adaptation element 19 is furthermore supplied with corresponding expected temperatures T 1 'to T 6', which should be present on the basis of the modeling of the temperature behavior by the material model 17. On the basis of any deviations between the actual temperatures Tl to T6 and the expected temperatures Tl 'to T6 ^r , the adaptation member 19 can thus determine in a conventional manner correction factors K1 to K6, by means of which the material model 17 (gradually) to the actual behavior of the steel or the steel strip 1 is adapted.

In addition to the means by which locally the temperature profile of the steel or the steel strip 1 can be acted upon, it is of course also possible to vary the material flow. For example, the take-off speed with which the steel strip 1 is withdrawn from the mold 6 can be varied. This has an influence on the subsequent system parts up to and including the coiler 11. Also, for example, a setting of a rolling stand of the rolling mill 10 can be changed. This affects everyone subsequent rolling stands of the rolling mill 10 as well as on the cooling section 15 and the reeling device 11. Such variations of the material flow thus act as part of the installation.

The control system 12 also determines guide variables for such system component measures. These guide sizes also indirectly influence the temperature behavior of the steel strip 1, because they change the length of time during which the locally acting devices act on the

Steel strip 1 can act. If, therefore, such system part cross-acting guide sizes are changed and these changes to the technological control loops 2 'to 11', 15 'are transmitted, the relevant parts of the plant 2 to 11, 15 are performed according to this reference variable. At the same time, however, the setpoint values for the material flow downstream, locally acting devices for influencing the temperature are correspondingly adapted by the control system 12 so that the overall temperature behavior of the steel strip 1 remains unchanged.

According to FIG 1, the rolling mill 10 of the deflection 9 is immediately downstream. A cast steel strip 1 must therefore be rolled immediately in the rolling mill 10. As indicated by dashed lines in FIG. 1, it is also possible to arrange an intermediate reel 20 and a compensating furnace 21 between the deflecting device 9 and the rolling mill 10. In this case, there is a decoupling of the casting process and the rolling process. However, the modeling of the steel strip 1 also takes into account this decoupling. Of course, in this case, the intermediate reel 20 and the compensation furnace 21, a further technological control loop 20 'associated, which is also performed by the control system 12. Optionally, the rolling mill 10, the reeling device 11, the intermediate reel 20 and the compensation furnace 21 can be combined to form a so-called Steckel mill. By means of the control system according to the invention is thus possible in a simple manner a continuous guidance of the production process of the molten steel to coiling of the finished strip, in particular, the temperature behavior of the steel strip 1 is modeled throughout.

Claims

claims

1. Casting rolling plant for producing a steel strip (1), with a liquid steel storage device (2), a liquid steel adding device (3), a vertically operating casting device (5) with revolving mold (6), a reduction device (7) with a plurality of roller pairs (8), a deflection device (9) for deflecting the cast steel strip (1) into a horizontal position, a horizontal rolling mill (10) and a reeling device (11), all components (2, 3, 5, 7, 9, 10, 11) via individual technological control circuits (2 ', 3', 5 ', 7', 9 ', 10', 11 ') are guided, characterized in that they for the integrated setting of the technological control circuits (2'; , 3 ', 5', 7 ', 9', 10 ', 11') include the liquid steel storage screen (2), the liquid steel adding device (3), the pouring device (5), the reduction device (7), the baffle (9), the rolling mill (10) and the reel device (11) control technology m It has interconnecting, based on mathematical models (17) working control system (12), the individual plant parts (2, 3, 5, 7, 9, 10, 11) in terms of their interaction in coordination with each other such that the effects of the control steps of one part of the installation (2, 3, 5, 7, 9, 10, 11) on plant parts following in mass flow direction (2, 3, 5, 7, 9, 10, 11) are taken into account.

2. Continuous casting plant according to claim 1, characterized in that the steel strip (1) cast by means of the mold (6) has a casting thickness (dl) of between 40 and 100 mm on exit from the mold (6).

3. Cast rolling mill according to claim 1 or 2, since you rchgekennzeichnet that the steel strip (1) in the reduction device (7) a roll input thickness (d2) between 10 and 40 mm, in particular between 15 and 35 mm, is reducible.

4. Cast rolling mill according to claim 2 and 3, d a d e r c h e c e n e c e s in that the steel strip (1) in the reduction device, based on the casting thickness (dl), at least 25% reducible.

5. Casting rolling mill according to one of the preceding claims, characterized in that the reduction device (7) has an upper part (13 ') in which the steel strip (1) is formed, and a lower part (13 *), in which the steel strip (1) maintains its shape.

6. Casting rolling mill according to one of the above claims, that it is so feasible by the control system (12) that the steel strip (1) only solidifies in the reduction device (7).

7. Cast rolling mill according to claim 5 and 6, d a d e r c h e c e n e c e s in that the steel strip (1) only solidifies in the lower part (13 *).

8. Cast rolling mill according to one of the above claims, characterized in that the steel strip (1) has a final thickness (d3) of between 0.3 and 6.0 mm, with which it is unwound by the reeling device (11).

Casting plant according to one of the preceding claims, characterized in that the steel strip (1) in the reduction device (7) is reduced to a roll inlet thickness (d2) which is determined as a function of a final thickness (d3) with which Steel strip (1) from the reel device (11) is reeled.

10. Cast rolling mill according to one of the above claims, characterized in that between the rolling mill (10) and the reel device

(11) a cooling section (15) is arranged, that the cooling section (15) by a technological control circuit (15 ') is guided and that also this control circuit (15') from the guide system (12) is guided.

11. Continuous casting plant according to one of the above claims, characterized in that the rolling mill (10) is preceded by a scale scrubber (14), which is guided by a technological control loop (10 ') and that this control loop (10') from the control system

(12).

12. Cast rolling mill according to one of the above claims, characterized in that between the deflecting device (9) and the rolling mill (10) an intermediate reel (20) and a compensation furnace (21) are arranged, that the intermediate reel (20) and the equalizing furnace (21 ) are guided by a technological control loop (20 ') and that also this control loop (20') is guided by the control system (12).

13. Casting rolling mill according to one of the above claims, characterized in that the control system (12) includes a material model (17), by means of which tracking a temperature behavior of the steel or the steel strip (1) from the steel supply device (2) to the reel device (11 ) and that the technological control loops (2 'to 11') can be modeled on the modeled temperature behavior of the

Steel or the steel strip (1) are performed correctly.

14. Cast rolling mill according to claim 13, wherein a phase transformation of the steel or the steel strip (1) (eg from liquid to solid or austenite into ferrite) is modeled within the material model (17).

15. Continuous casting plant according to claim 14 ', characterized in that structural properties of the steel strip (1) are modeled in the context of the material model (17).

16. Continuous casting plant according to claim 13, 14 or 15, characterized in that the melt temperature (T0) of the steel is measured and fed to the material model (17) as an initial parameter.

17. Cast rolling mill according to one of claims 13 to 16, characterized in that behind the mold (6), behind the reduction device (7), within the rolling mill (10) and / or behind the rolling mill (10), possibly also within and / or behind the cooling section (15), an actual temperature (Tl to T6) of the steel strip (1) detected and used to adapt the material model (17).

18. Cast rolling mill according to one of claims 13 to 17, characterized in that the individual plant parts (2 to 11) locally acting devices for influencing the temperature of the steel or the steel strip (1) and that the locally acting devices on the individual plant parts (2 to 11) associated with technological control circuits (2 'to 11') are controlled according to the leadership of the control system (12).

19. Roll casting plant according to one of claims 13 to 18, characterized the control system (12) determines at least one reference variable for influencing the temperature of the steel or steel strip (1) acting across the plant sections and guides the relevant system parts (2 to 11) in accordance with this reference variable.