Method for producing an aluminum strip and casting-rolling system for producing an aluminum strip

Abstract

The invention relates to a method for producing an aluminum strip (2) in a coupled casting-rolling process, comprising the method steps: a) melting an aluminum raw material comprising at least one aluminum alloy in at least one melting assembly (4), b) determining the alloy composition of the melt (3), c) casting the melt (3 to form a hot-rolled strip by means of at least one strip-casting machine (6), d) rolling the hot-rolled strip in a rolling system (14) comprising at least one rolling device for shaping the hot-rolled strip for thickness and / or width reduction, and e) regulating and / or controlling at least one shaping parameter of the rolling system (14) as a function of the alloy composition of the melt (3). The invention also relates to a casting-rolling system (1) for carrying out the method.

Description

[0001] The invention relates to a method for producing aluminum strip in a coupled casting-rolling process.

[0002] From WO 2019 / 01 02841 a method for producing an aluminum product from a cast aluminum strip is known, in which a hot strip is first produced by means of at least one strip casting machine, which is then hot rolled.

[0003] DE 69319217 T2 discloses a process for producing can body sheet. This process comprises continuously hot rolling a hot aluminum feed stock to reduce its thickness, coiling the hot-rolled, still-hot feed stock, and maintaining the reduced-thickness feed strip at or near the initial temperature of the hot rolling. The hot-coiled feed stock is then uncoiled, and immediately thereafter, the annealed feed stock is rapidly quenched to a temperature suitable for cold rolling. The process is carried out as a continuous in-line process.

[0004] US 2003 / 150587 A1, which forms the basis for the preamble of claims 1 and 17, discloses a method for producing aluminum strip in a coupled casting and rolling process. Further prior art is known from EP 3 234 208 A1, DE 10 2019 105598 A1, and EP 3 434 383 A1.

[0005] Many products otherwise made from sheet steel are now being converted to lightweight materials such as aluminum. Due to increasing aluminum consumption, larger quantities of aluminum scrap will become available in the medium term. Processing aluminum waste is more energy-efficient than extracting primary aluminum through electrolysis. However, the use of aluminum scrap is problematic because it consists of a mixture of different aluminum alloys, each containing a variety of undesirable alloying components. These alloying components are eliminated in conventional casting processes, such as ingot casting, due to the low solidification rate of the melt, and they impair the grain structure of the solidified material.For this reason, a high proportion of primary aluminum is still used in the production of certain end products such as beverage cans, components for use in the electrical industry, or automobile bodies.

[0006] The invention is based on the object of providing a method of the type mentioned above, with which a high proportion of aluminum scrap can be processed as an aluminum raw material or starting material for the production of aluminum strip of an industrially usable quality. Finally, the invention is based on the object of providing a casting and rolling plant particularly suitable for the method according to the invention.

[0007] The invention is achieved by the features of the independent claims relating to a method, an aluminum product, and a casting and rolling plant. Advantageous embodiments of the invention are set forth in the subclaims.

[0008] According to one aspect of the invention, a method for producing aluminum strip in a coupled casting-rolling process is provided, which is preferably operated as a continuous casting-rolling process, which comprises the following process steps: a) melting an aluminum raw material comprising at least one aluminum alloy in at least one melting unit, b) determining the alloy composition of the melt c) pouring the melt into a cast strip by means of at least one strip casting machine, d) rolling the hot strip in a rolling mill comprising at least one rolling device for forming the hot strip for the purpose of reducing its thickness and / or width, and e) regulating and / or controlling at least one forming parameter of the rolling mill as a function of the alloy composition of the melt.

[0009] "Coupled" in the context of the present invention means that the casting process and the rolling process are linked in terms of process technology and material flow. Depending on the design of the melting unit, the melting of the aluminum raw material, the casting, and the rolling can also take place continuously, with the material flow rate always determined by the strip speed during casting.

[0010] According to the invention, the alloy composition of the melt can be determined continuously or batchwise.

[0011] The results of the alloy composition analysis can be fed online, preferably in real time, to a control and / or regulation system of a casting and rolling mill. A suitable method for analyzing the alloy composition of the melt is, for example, spectral analysis, X-ray measurement, or a similar known measurement method.

[0012] The aluminum raw material used is preferably a mixture of electrolytically produced pure aluminum or primary aluminum and aluminum scrap. The aluminum raw material may contain impurities such as iron, copper, silicon, chromium, magnesium, manganese, nickel, zinc, and tin.

[0013] Preferably, the melt is continuously fed to the at least one strip casting machine via a pouring trough, whereby the melt can be filtered to remove any impurities. Continuously feeding the melt into the strip casting machine has the advantage that the melt level upstream of the casting nozzle is largely constant, allowing relatively constant casting conditions to be established. This allows the melting process to be directly coupled with the casting-rolling process.

[0014] Preferably, at least one forming parameter is selected from a group of parameters comprising a thickness reduction of the hot strip, a width reduction of the hot strip, the strip temperature of the hot strip, the rolling speed, the strip tension of the hot strip, the rolling force, the roll bending, an axial adjustment of at least one roll, the roll gap geometry, the rolling torque, the cooling of the rolls and the lubrication of the rolls.

[0015] This is advantageous in connection with the method according to the invention in that the material hardness of the cast strip, and thus the forming resistance during rolling, changes depending on the impurity content, and the properties of the hot strip change accordingly after rolling. According to the invention, the force and work requirements as well as other forming parameters during rolling can be adjusted accordingly. These adjustments can also include influencing the strip geometry, influencing the rheological roll gap conditions, and influencing the material properties of the aluminum strip or the hot strip, for example, through cooling and lubrication devices.

[0016] In a preferred variant of the method, it is provided that the control comprises a pre-control of the rolling mill for a given and / or selected strip length section of the hot strip depending on the alloy composition determined according to method step b).

[0017] Particularly preferably, the pre-control includes the specification of at least one setpoint for a thickness and / or profile control of at least one rolling device. Experimental studies with comparative analyses have determined mathematical relationships between changes in the alloy composition and the forming resistances occurring during rolling.

[0018] Thus, deviations in the alloy composition contained in the melt are not treated during casting with regard to the properties of the finished material, but only later during forming by rolling.

[0019] Alternatively or additionally, casting parameters such as the casting thickness, the casting speed and the casting belt temperature can be adjusted using control technology.

[0020] The material hardness H, as well as the forming resistance depending on the alloy composition, can be represented with an exponent to a constant as the basic factor of the material hardness. H = K ∗ e 1 ∗ e 1 % ∗ e 2 ∗ e 2 % ∗ en ∗ en% with K = standard alloy specific strength within the alloy group (AAXXXX) e1 to en = influence exponent of an alloying element e1% to en% = percentage of the alloying element Exponents of the alloy composition

[0021] GROUP AL-Mg-Mn constant 57.484 SI -0.03252 FE 0 Cu 0.03422 Mn 0.2238 Mg 0.59534 Cr 0 Zn 0 Ti 0 Certainty 0.9687 Without influence FE

[0022] The constant is the fundamental factor within the alloy group. The exponents serve as exponents of the alloy's content of the respective element. The material hardness H due to the alloy change can be calculated by inserting the contents. This allows for the advance calculation of the rolling force change and thus pre-control, for example, of the setting position of the work rolls of a rolling mill to produce the (originally) intended rolled product.

[0023] The same algorithm can be used to perform pre-control of the roll gap profile. The roll gap profile change is implemented based on the expected change in rolling force by pre-controlling the work roll bending device or roll shifting.

[0024] Alloy fluctuations change the forming resistance of the hot strip. When the hot strip enters the roll gap of a rolling mill, the rolling force changes and with it the thickness reduction of the hot strip. By measuring the rolling force and knowing the reaction forces and stiffness of the rolling mill, a thickness error can be calculated. This thickness error is attributed to a setting position of the work rolls with an adjusted gain, which sets the target thickness of the hot strip. Based on experimental investigations with comparative analyses, approximate calculations can be used to show relationships between changing circumferential resistances due to analysis fluctuations. Using feedforward control, the thickness control can be corrected as soon as hot strip with a changed alloy composition enters the rolling mill.In this way, a pre-control can specify an additional setpoint for the adjustment of at least one rolling device, so that thickness control is no longer required or is only required to a small extent.

[0025] In a particularly advantageous embodiment of the method according to the invention, it is provided that the melt has a recycled material content, preferably in the form of aluminum scrap, of at least 60 percent by weight, preferably of at least 70 percent by weight, further preferably of at least 85 percent by weight and particularly preferably of at least 95 percent by weight.

[0026] By recycling mixed aluminum scrap from the life cycle into new production, aluminum strip can be produced in a particularly resource-efficient and environmentally friendly manner. The process according to the invention allows for the production of particularly high-quality alloys.

[0027] The aluminum alloy can be selected from a group comprising the aluminum alloys AA2 XXX, AA5XXX, AA6 XXX, and AA7 XXX. These alloy groups contain multiple alloying components and are used for applications in the electrical and automotive industries, among others.

[0028] Preferably, the melt is cast into a strip with a thickness of 10 mm to 30 mm. Casting can be carried out, for example, at a casting speed of 4 m / min to 16 m / min.

[0029] Rolling is preferably carried out at a temperature of 150°C to 600°C, preferably 300°- 500°C with a thickness reduction of 20 to 75° per rolling stand based on the initial thickness of the hot strip

[0030] Particularly preferably, the casting of the melt into a cast strip is carried out using at least one casting machine with a traveling mold. The traveling mold of the strip casting machine can be designed as a rotating belt (so-called belt caster) or as rotating blocks (so-called block caster). For the purposes of the invention, a strip casting machine is therefore understood to be a casting machine that produces strip-shaped cast material. It is advantageous that casting takes place at an increased cooling rate and thus, compared to conventional slab casting machines, at a higher solidification rate, whereby impurities are partially kept in solution during casting.The fact that the melt solidifies without relative movement to the mold results in a very intensive heat transfer and the melt can solidify relatively quickly, which is particularly advantageous because it keeps impurities in the melt partially in solution.

[0031] In a preferred variant of the method according to the invention, parallel operation of several melting units is provided for providing different desired alloy compositions.

[0032] According to the invention, one or more multi-chamber melting furnaces can be provided as melting units. Depending on the desired alloy composition, the melting units can be fed from a corresponding supply of various aluminum scraps with different compositions.

[0033] Furthermore, it may be possible to mix melts with different alloy compositions in order to be able to adjust the chemical composition of the liquid aluminum within narrow limits according to the requirements of the final product before casting.

[0034] It is advisable to adjust the temperature of the casting strip before rolling. For this purpose, a temperature control device can be provided, either by increasing or cooling the temperature of the casting strip before rolling.

[0035] In the method according to the invention, the hot strip can be quenched downstream of the at least one rolling device or downstream of at least one rolling device, for example, to a temperature of 150 °C to 250 °C. Such quenching is particularly advantageous to prevent coarse grain formation in the microstructure.

[0036] Furthermore, an abrasive surface conditioning is preferably provided for the top and / or the bottom of the cast hot strip in order to be able to remove contaminants from the strip surface on each side.

[0037] A further aspect of the invention relates to a casting-rolling plant for producing aluminum strip, in particular for carrying out the method described above, comprising at least one melting unit, at least one strip casting machine and at least one rolling device, means for determining the alloy composition of an aluminum melt and at least one regulating and / or control device for regulating and / or controlling at least one forming parameter of the at least one rolling device as a function of the alloy composition of the melt.

[0038] The strip casting machine can be designed as a casting machine with a moving mold.

[0039] At least one multi-chamber melting furnace can be provided as the melting unit.

[0040] The casting-rolling plant according to the invention expediently comprises a plurality of rolling stands, each of which preferably has at least two work rolls and two backup rolls as well as at least two hydraulic adjusting cylinders for adjusting a roll gap.

[0041] The work rolls can be designed as so-called CVC (Continuous Variable Crown) rolls with a crowned contour.

[0042] The casting and rolling plant according to the invention advantageously comprises at least one trimming shear, which is arranged behind a rolling device and in front of a coiler. This serves to precisely adjust the width of the finished rolled strip and to remove tight strip edges or edge cracks.

[0043] Preferably, the casting-rolling device according to the invention comprises means for surface conditioning the cast hot strip, for example in the form of brushing devices, means for applying high-pressure liquid media to the hot strip, or the like. These means are preferably arranged upstream of the rolling devices in the transport direction of the hot strip.

[0044] The casting and rolling plant may further comprise means for cooling the rolled strip behind the rolling mill or behind a final rolling device.

[0045] The casting-rolling plant according to the invention preferably comprises at least two rolling devices or rolling stands arranged directly one behind the other.

[0046] The distance between the rolling mills and the at least one strip casting machine can be between 5 m and 20 m. This compact arrangement prevents precipitation processes in the rolled stock.

[0047] The casting-rolling plant according to the invention preferably comprises a scrap return system of process scrap to a storage level of the melting units

[0048] The invention is explained below with reference to an embodiment shown in the drawings.

[0049] They show: Figure 1 is a schematic representation of the casting-rolling process according to the invention and Figure 2 is a schematic representation of a control scheme of the method according to the invention.

[0050] Figure 1shows a casting and rolling plant 1 for producing aluminum strip 2 according to the method according to the invention. The casting and rolling plant 1 comprises several melting units 4 for producing a melt 3 of aluminum. The melting units 4, which are only shown schematically, can be designed, for example, as multi-chamber melting furnaces. The melting units 4 are fed with an aluminum raw material from a storage level 5, on which, among other things, aluminum scrap is stored in various scrap storage areas A, B, C, and D. The aluminum scrap consists, for example, of can scrap obtained from a waste management company and partly of process scrap that arises in the process described below.

[0051] The casting and rolling plant 1 according to the invention further comprises a strip casting machine 6, which is designed, for example, as a so-called belt caster or block caster for producing cast strip 7, as well as two rolling stands 15 arranged downstream in the transport direction, with which the thickness of the aluminum strip 2 is reduced. The rolling stands 15 are arranged at a short distance of between 5 m and 20 m in the transport direction behind the strip casting machine 6. Immediately downstream of the strip casting machine 6 is a device 11 for surface cleaning the cast aluminum strip 2 and a cropping shear 12 for severing the cast strip head and / or tail that arises during the casting of the aluminum strip 2 and cannot be further processed.The pieces of the casting strip 7 cut by the cropping shear 12 are collected in a scrap hopper 13A and fed to a process scrap system 25, which returns the sorted process scrap to the storage level 5 and can thus reintroduce it into the production cycle. Optionally, a temperature control device 16, designed as a heating and / or cooling device, can be provided upstream of the rolling stands 15.

[0052] The rolling stands 15 each comprise two driven work rolls and two backup rolls, as well as a hydraulic adjustment system for the work rolls, via which the roll pitch can be adjusted. The rolling stands 15 also each comprise a work roll bending system and means for axial adjustment of the work rolls.

[0053] The aluminum melt 3 produced by the melting units 4 is fed to the strip casting machine 6 via a pouring trough 8 with a regulated mass flow. To regulate the mass flow of the melt 3, a flow regulator 9 is provided in the pouring trough 8, followed by a filter 10 for filtering out impurities from the melt 3. The melt can thus be fed to the casting machine continuously, enabling a quasi-continuous casting-melting-rolling process. A strip cooling device 18 is arranged downstream of the two rolling stands 15 forming the rolling mill 14, followed by a trimming shear 19. Following this is a flying shear 21. Finally, two reels 23 are provided for winding up the rolled aluminum strip. Behind the trimming shear 19 and behind the flying shear 21, further scrap bunkers 13B and 13C are arranged, from which the process scrap can be fed via the system for process scrap 25.The material cuts collected in the scrap bunkers 13A, 13B, and 13C can be fed as sorted scrap to the respective scrap storage areas A, B, C, and D on storage level 5. Scrap logistics can be provided for the process scrap system 25, which can be operated in an automated, semi-automated, or manual manner.

[0054] The aluminum scrap pre-sorted in scrap storage areas A, B, C, and D is first subjected to a two-stage melting process in melting units 4. The scrap is first heated until any paint and other organic compounds present evaporate. The steam can be further used, for example, as an energy source. The aluminum is then melted down. Using an analysis device 40, the chemical composition of the melt is analyzed; for example, the proportion of metallic impurities in the form of iron, copper, silicon, chromium, magnesium, manganese, nickel, zinc, and tin is determined. Depending on the analysis, the alloy composition is recharged to achieve specific desired properties. For this purpose, appropriate portions of process scrap and / or pure aluminum are fed from storage level 5 or from scrap storage areas A, B, C, and D.The temperature of the melt is adjusted, among other things, by the proportion of scrap added.

[0055] The adjusted melt is fed to the strip casting machine 6 via the pouring trough 8 at a controlled mass flow. The melt passes through the filter 10, which filters out any impurities in the melt. A pouring nozzle (not further designated) guides the melt into the solidification zone. The mold of the strip casting machine 6 is designed as a traveling mold. The melt solidifies without any relative movement to the mold. This results in very intensive heat transfer and the melt can solidify relatively quickly. The melt is cast as a casting strip 7 with a thickness of 10 mm to 30 mm, particularly preferably with a thickness of 15 to 25 mm, at a casting speed of 4 m / min to 16 m / min. The rapid solidification of the melt prevents segregation and suppresses the precipitation of impurities in the form of, for example, iron, copper, silicon, chromium, nickel, zinc, and tin.The alloy components remain largely in solution. This makes the casting process more tolerant of impurities. The rigid, moving mold of the strip casting machine 6 prevents detachment of the solidifying strand. Heat transfer remains consistently high.

[0056] The solidified cast strip 7 is fed directly to the rolling mill 14 and reduced in thickness to aluminum strip 2. Due to the fact that only a relatively small distance is provided between the rolling mill 14 and the strip casting machine 6, as already explained above, precipitation processes in the rolled material are prevented.

[0057] The pass reduction per roll stand 15 is preferably between 25% and 70% per roll stand. This converts the cast structure of the cast strip 7 into a rolled structure of the aluminum strip 2, creating a rolled texture in the material. As already mentioned above, hydraulically acting actuators are arranged on each roll stand 15, with which the roll rise, and / or a roll bending system, and / or an axial adjustment of the work rolls can be effected.

[0058] According to the invention, control of the rolling mill is provided as a function of the alloy composition of the melt 3, which is determined via the analysis device 40 and fed to a control and / or regulating device designated 50. This controls the actuators of the rolling stands 15 accordingly, wherein a pre-control of the rolling mill 14 is expediently provided for a given or selected strip length section of the cast strip 7. The pre-control comprises the specification of at least one setpoint for a thickness and / or profile control of at least one of the rolling stands 15. By means of the pre-control, a correction of the at least one thickness and / or profile control takes place as soon as the cast strip 7 with a specific known alloy composition enters the rolling mill 14.

[0059] The thickness, pass reduction, and width of the aluminum strip 2 are determined by various parameters that define the forming resistance. These parameters include the alloy composition, strip temperature, strip tension, roll lubrication, roll diameter, roll geometry (bend, crown), rolling force, and rolling torque.

[0060] According to the invention, at least some of these parameters can be controlled, whereby the calculation can be performed within the control device 50 and the control device accesses a process model 55, or alternatively, the calculation can be performed within the process model 55 and the results of the calculation can be converted in the control device into setting parameters of the casting-rolling mill 1. In particular, it is provided that the results of the analysis device 40 act on at least the rolling mill 14 for regulating and / or controlling, preferably independently of the casting process and the strip casting machine 6.

[0061] The control scheme is roughly schematic in Figure 2illustrated. Process step a) refers to the melting of the aluminum raw material, process step b) the analysis of the alloy composition of the melt, process step c) the casting of the melt using the strip casting machine 6 and process step d) the rolling of the hot strip. In Figure 2 Otherwise, identical parts of the casting and rolling plant 1 are provided with the same reference numerals.

[0062] Reference numeral 60 designates a production planning and control module that is connected to the process model 55 in order to incorporate production specifications such as strip widths, target thicknesses, target structure, etc. into the calculation. The production planning and control module 60 influences the composition of the melt 3, for example, via the target specification X, for example by appropriately supplying aluminum scrap from the various scrap storage locations A, B, C, D. The subsequent analysis device 40 determines the proportion of impurities in the melt 3, which is fed as an input variable to the control device 50. List of reference symbols

[0063] 1 Casting and rolling mill 2 Aluminum strip 3 Melt 4 Melting units 5 Storage level 6 Strip casting machine 7 Casting belt 8 Launder 9 Flow regulator 10 Filter 11 Surface cleaning device 12 Cropping shear 13 A, 13 B, 13 C Scrap container 14 Rolling mill 15 Rolling stands 16 Temperature control device 17 Not assigned 18 Strip cooling devices 19 Trimming shear 20 Not assigned 21 Flying shear 23 Coiler 24 Coil storage 25 Scrap return system 40 Analysis device 50 Control device 55 Process model 60 Production planning and control module A, B, C, D Scrap storage

Claims

1. Method of producing aluminium strip (2) in a coupled casting and rolling process, comprising the method steps: - melting an aluminium raw material comprising at least one aluminium alloy in at least one smelting unit (4), - casting the melt (3) to form a cast strip (7) by means of at least one strip casting machine (6), - rolling the hot strip in a rolling installation (14) comprising at least one rolling device for reshaping the hot strip for the purpose of thickness and / or width reduction, characterised by the method steps - determining the alloy composition of the melt (3) and - regulating and / or controlling at least one reshaping parameter of the rolling installation (14) in dependence on the alloy composition of the melt (3).

2. Method according to claim 1, characterised in that the casting and rolling process is performed as a continuous process.

3. Method according to one of claims 1 and 2, characterised in that at least one reshaping parameter is selected from a group of parameters comprising thickness reduction of the hot strip, width reduction of the hot strip, strip temperature of the hot strip, rolling speed, strip tension of the hot strip, rolling force, roll bending, axial adjustment of at least one roll, rolling gap geometry, rolling moment, cooling of the rolls and lubrication of the rolls.

4. Method according to any one of claims 1 to 3, characterised in that the regulation comprises pre-controlling of the rolling installation (14) for a given and / or selected strip length section of the cast strip in dependence on the alloy composition determined in accordance with method step b).

5. Method according to claim 4, characterised in that the pre-controlling comprises presetting at least one target value for a thickness and / or profile regulation of at least one rolling device.

6. Method according to any one of claims 1 to 5, characterised in that the melt (3) comprises a recyclate component, preferably in the form of aluminium scrap, of at least 60 weight %, preferably at least 70 weight %, more preferably at least 85 weight % and particularly preferably at least 95 weight %.

7. Method according to any one of claims 1 to 6, characterised in that the aluminium alloy is selected from a group comprising the aluminium alloys AA2XXX, AA5XXX, AA6XXX and AA7XXX.

8. Method according to any one of claims 1 to 7, characterised in that casting of the melt (3) is carried out to form a cast strip (7) with a thickness of 10 mm to a thickness of 30 mm.

9. Method according to any one of claims 1 to 8, characterised in that the casting is carried out at a casting speed of 4 m / min to 16 m / min.

10. Method according to any one of claims 1 to 9, characterised by an abrasive surface conditioning of the upper side and / or lower side of the cast strip.

11. Method according to any one of claims 1 to 10, characterised in that the rolling is performed at a temperature of 150° C to 600° C, preferably 300° to 500° C, and with a thickness reduction of 20% to 75% per roll stand referred to the starting thickness of the hot strip.

12. Method according to any one of claims 1 to 11, characterised in that the casting of the melt (3) is performed with use of at least one casting machine with a co-travelling mould.

13. Method according to any one of claims 1 to 12, characterised by parallel operation of a plurality of smelting units (4), preferably with different alloy compositions.

14. Method according to any one of claims 1 to 13, characterised by mixing of melts (3) with different alloy compositions.

15. Method according to any one of claims 1 to 14, characterised by setting the temperature of the cast strip (7) prior to rolling.

16. Method according to any one of claims 1 to 15, characterised by quenching the hot strip behind the at least one rolling device.

17. Casting and rolling installation (1) for producing aluminium strip (2), particularly for performing the method according to any one of claims 1 to 16, comprising at least one smelting unit (4), at least one strip casting machine (6) and at least one rolling device, characterised by means for determining the alloy composition of an aluminium melt and by at least one regulating device and controlling device (50) for regulating and / or controlling at least one reshaping parameter of the at least one rolling device in dependence on the alloy composition of the melt (3).

18. Casting and rolling installation (1) according to claim 17, characterised in that the strip casting machine (6) is configured as a casting machine with a co-travelling mould.

19. Casting and rolling installation (1) according to one of claims 17 and 18, characterised in that at least one multi-chamber smelting furnace is provided as smelting unit (4).

20. Casting and rolling installation (1) according to any one of claims 17 to 19, characterised by a plurality of roll stands (15) preferably comprising at least two work rolls and two backing rolls as well as at least two hydraulic adjusting cylinders for setting a rolling gap.

21. Casting and rolling installation (1) according to any one of claims 17 to 20, characterised by means for abrasive surface conditioning of the cast strip, which are preferably arranged in front of the at least one rolling device in transport direction.

22. Casting and rolling installation (1) according to any one of claims 17 to 21, characterised by at least one trimming shears (19) arranged behind a rolling device and in front of a coiler (23).

23. Casting and rolling installation (1) according to any one of claims 17 to 22, characterised by a scrap return system of process scrap materials to a storage plane (5) of the smelting units (5).

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