EP2171103A1

EP2171103A1 - Process and device for producing strips of silicon steel or multiphase steel

Info

Publication number: EP2171103A1
Application number: EP08784929A
Authority: EP
Inventors: Jürgen Seidel; Joachim Ohlert
Original assignee: SMS Siemag AG
Current assignee: SMS Siemag AG
Priority date: 2007-07-21
Filing date: 2008-07-21
Publication date: 2010-04-07
Also published as: RU2010106017A; DE102008029581A1; US8137485B2; US20100116380A1; AU2008280462A1; MX2009012654A; KR20100006565A; CN101809173A; AR067868A1; RU2435657C2; TW200927313A; BRPI0812549B1; CA2687434A1; WO2009012963A1; JP2010534137A; BRPI0812549A2

Abstract

The invention relates to a process for producing strips (1) of silicon steel, in particular of grain-oriented silicon steel, and also from multiphase steel, in which a slab (3) in initially cast in a casting machine (2), wherein this slab is subsequently rolled to form the strip (1) in at least one roll train (4, 5) and wherein the slab (3) is heated in at least one furnace (6, 7) upstream and/or downstream of the at least one roll train (4, 5). In order to improve the quality and producibility of grain-oriented silicon steel or of multiphase steel, the invention provides that the slab (3) is heated to a pre-roll temperature (T1) in a first furnace (6) downstream of the casting machine (2) and upstream of a pre-roll train (4), or the slab (3) passes into the pre-roll train (4) using the casting heat without the presence of the first furnace (6), that the slab (3) is then rolled in the pre-roll train (4), that the slab is heated to a defined temperature (T2), which is higher than the pre-roll temperature (T1), in a second furnace (7) downstream of the pre-roll train (4), and that the slab (3) is then rolled to the final strip thickness in a finishing-roll train (5).

Description

METHOD UKD DEVICE FOR WARM ROLLING OF SILICON STEEL OR MULTI-PHASE BANDS

The invention relates to a method for producing strips of steel, preferably of silicon steel, in particular of grain-oriented silicon steel, or of multi-phase steel or of a steel with comparatively high alloy contents (eg microalloyed steel), in which initially in a casting machine a slab is cast, which is then rolled in at least one rolling train to the strip and wherein before and / or behind the at least one rolling line is carried out a heating of the slab in at least one furnace. Furthermore, the invention relates to an apparatus for producing a strip of silicon steel and multiphase steel.

Recently, demand for silicon steel production equipment has increased. A distinction is made between grain-oriented (GO or CGO and HGO) and non-grain-oriented (NGO) silicon steel. The rolling of non-grain oriented silicon steels has already become known in thin slab plants. This material can be produced very economically and with good quality. Increasingly, the production of grain-oriented silicon steel is in demand.

Grain-oriented silicon steel is currently being rolled in conventional hot strip mills. There are different process routes here. In a process route where high-quality grain-oriented silicon steel is produced, the slab is first pre-rolled after being heated. Here, the transformation of the coarse cast structure into a finer, more homogeneous structure with the highest possible proportion of equiaxial areas. Pre-rolling increases the process window and has a positive effect on the magnetic properties of the final product. Subsequently, a renewed heating to higher furnace temperatures takes place. The different types of exemption are fertilize, which are to act as inhibitors during the later process steps, as completely as possible brought into solution. This results in a favorable structure formation for the subsequent process. Based on the high temperature, the slab is then rolled in a roughing and finishing line to the thin hot strip finished.

Details of the mentioned technology are described, for example, in EP 0 193 373 B1, in DE 40 01 524 A1, in EP 1 025 268 B1, in EP 1 752 548 A1 and in DE 602 05 647 T2.

In particular, for the production of grain-oriented silicon steel currently used manufacturing processes are not yet satisfactory. This applies with regard to the quantity output and the profitability in the production.

It is therefore an object of the present invention to provide a method and associated apparatus by which it is possible to achieve improved results in the production of silicon steel strip, particularly grain oriented silicon steel strip, both in terms of output to tape pro. Time and energy used in processing as well as the quality of the tape.

Demand for multiphase steel has also been on a steady rise over the last few years. Multiphase steels are usually produced in conventional hot strip mills. Due to the temperature difference over the length when entering the finishing train, it must be accepted that the rolling speed changes over the length in order to set a constant final rolling temperature. The increasing speed along the length of the strip leads to difficulties in setting a homogeneous structure over the length in the cooling section, since multiphase steels must be subjected to complicated temperature-time cycles. The heating before rolling is also used, among other things, the relatively rough and uneven moderate homogenization of castings, but this is only possible to a limited extent. Overall, the manufacturing processes for the production of multiphase steels are still not satisfactory.

It is therefore an object of the present invention to provide a method and associated apparatus with which it is possible to achieve improved results also in the production of multiphase steel, both in terms of the amount of tape delivered per time and the energy used in processing as well as the quality of the tape.

The solution of this problem by the invention is procedurally characterized in that the slab is heated behind the casting machine and a roughing mill in a first furnace to a rough rolling temperature, that the slab is then rolled in the roughing mill, that the slab behind the roughing mill in a second oven to a defined temperature, which is higher than the rough rolling temperature, is heated and then that the slab is rolled in a finishing train to the final strip thickness.

Alternatively, the first oven is dispensed with, and the slab is rolled in the roughing line, using the casting temperature directly in-line with the casting machine. Subsequently, as described above, the heating to a higher temperature and the finish rolling.

Preferably the Vorwalztemperatur is between 1,000 and 1,200 C ⁰ ⁰ C, and the temperature defined in front of the finishing train between 1,150 and 1,350 C ⁰ ⁰ C, for silicon steel in particular above 1,200 ⁰ C and for multiphase steel below 1,300 ⁰ C.

The strip may be maintained at the elevated temperature, preferably at 1150 ° C to 1300 ° C, for a predetermined hold time in the case of processing multiphase steel until uneven distributions of Alloying elements (segregations) at least partially, preferably completely degraded. However, the band in case of processing of grain-oriented silicon steel for a predetermined holding time at the elevated temperature, preferably maintained at 1200 ⁰ C to 1350 ° C until the different kinds of precipitates at least partially, preferably completely, placed in solution.

The belt can be stored in a ferry or in a furnace in or next to the main transport line during the predetermined holding time.

The heating to the higher temperature can be done at least partially by induction heating. It can also be done at least partially by direct flame impingement of the slab. In the latter case, it is preferably provided that the flame is applied directly to the slab by means of a gas jet with at least 75% oxygen into which a gaseous or liquid fuel is mixed. However, it is also an indirect flame application of conventional type with use of oxygen-fuel mixture (oxyfuel process) is provided.

A further embodiment of the invention proposal provides that the WaIZ zen of the slab is carried out in batch mode. Alternatively it can be provided that the rolling of the slab in the endless operation depends on the final thickness to be rolled, the casting speed and the material.

The procedure described above with the steps of casting, pre-rolling at a first temperature and subsequent heating to an elevated temperature and finish rolling can be carried out in silicon steels as well as in microalloyed steels and multiphase steels.

The device for producing a strip of silicon steel, in particular of grain-oriented silicon steel, as well as of multiphase steel according to the invention is characterized in that between the casting machine and a Vorwalzstraße a first furnace is arranged, with which the slab can be heated to a Vorwalztemperatur. Alternatively, the casting heat is utilized and arranged the Vorwalzstraße directly behind the caster. Furthermore, behind the rough rolling mill and before a finishing train a second furnace is arranged, with which the slab can be heated to an elevated temperature, wherein the second furnace is designed as a high-temperature furnace. In an alternative embodiment, a coil box is additionally arranged behind the roughing train as Vorbandspeicher.

The second oven preferably comprises a combination of conventional oven and induction heating. It may also include means for direct flame impingement of the slab. Furthermore, the second furnace may comprise a conventional furnace.

In the conveying direction of the slab, a conventional oven and then an induction heater or a device for direct flame impingement of the slab can be arranged first. An alternative provides that in the conveying direction of the slab initially an induction heater or a device for direct flame impingement of the slab and then a conventional furnace are arranged. A further alternative provides that in the conveying direction of the slab initially a conventional oven, then an induction heater or a device for direct flame exposure of the slab and then another conventional oven are arranged. Finally, it can also be provided that in the conveying direction of the slab initially an induction heater or a device for direct flame impingement of the slab, then a conventional oven and then another induction heating or a device for direct flame impingement of the slab is arranged.

Parts of the first furnace or of the second furnace may also be at least partially designed as a ferry (in particular a pendulum or transverse ferry or coiled ferry), so that in a 2-strand caster both thin slabs are conveyed into the waiver. can never be pushed and rolled on the rolling mill (or rolling mills).

Furthermore, a 1-strand caster with at least one pendulum or transverse ferry or Coilfähre is possible to allow storage of a thin slab or deformed thin slab in a ferry or in a parallel oven.

A pair of scissors is preferably arranged in front of the first oven.

The first rolling mill may consist of a single roll stand or of a plurality of rolling stands.

It can be used a vertical casting machine or a sheet-casting machine.

A further embodiment provides that a roller shutter encapsulation is provided which can be swiveled or introduced into the production line instead of a conventional furnace.

A coil box can be placed behind the roughing mill.

The at least one induction heater or the at least one device for direct flame impingement of the slab can be displaceably arranged in the direction transverse to the conveying direction of the slab. In this case it can be provided that at least one conventional furnace is provided, which is arranged displaceably in the direction transverse to the conveying direction of the slab to replace the induction heating or the device for direct flame application. A further development provides that the first furnace arranged upstream of the rough rolling mill comprises a device for direct flame impingement of the slab or partly consists of an inductive heating.

According to one embodiment of the device, the roughing train can be arranged directly behind the casting installation without the presence of the first furnace.

Parts of the first furnace or the second furnace may be designed as a ferry. It is preferably provided that the ferry is designed as a pendulum or transverse ferry or as Coilfähre to allow storage of a thin slab or a deformed thin slab in an oven next to the main transport line of a 1- or 2-strand caster.

The furnace can be used as a production buffer during z. B. serve a roll change. Furthermore, the furnace is provided for purposefully holding the slabs at the elevated temperature prior to finish rolling for metallurgical reasons (for example, compensation of segregation, removal of precipitates into solution).

Before the pre-deformation of the slab, means for high-pressure descaling can be arranged. These are preferably designed for operation with a pressure between 400 and 600 bar.

The device may further comprise directional or hold-down rollers and / or a camera for ski detection. The Rieht- or Niederhalterollen and / or the camera are preferably arranged in front of an induction heater.

To eliminate a ski can be provided in all variants of the device according to the invention that at least one crop shear is located immediately before the induction heating (instead of behind the induction heating).

It is also possible to arrange two cropping shears in succession without a rolling stand located therebetween. Here, the two Schopfsche- be formed differently, making it possible to use individually to adapt to different transport speeds of the deformed thin slab one or the other scissors.

The inventive concept is based on the known CSP technology. This is to be understood as meaning thin-slab thin-strip casting rolling mills which enable efficient production of hot strip if the rigid connection of the continuous casting plant and rolling train and their temperature control are mastered by the entire plant. Following the procedure in the conventional hot strip mill so after casting the thin slab is heated again slightly or exploits the casting temperature, then pre-rolled, brought to a higher temperature for the second time and then finished rolled.

Because the production on CSP plants is a very economical process and also has some advantages in terms of microstructure development, the proposed approach also brings the advantages of this technology to bear in the production of silicon steel strips and multiphase steels. This results in favorable conditions with regard to the basic advantages of the CSP system and the process reliability.

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

1 is a schematic view of a casting and rolling plant according to a first embodiment of the invention with a casting machine, a first furnace, a roughing mill, a second furnace and a finishing train;

2 an alternative to Fig. 1 embodiment of the casting rolling mill,

FIG. 3 shows a further embodiment of the cast roll mill, alternative to FIG. 1, FIG. 4 shows the second furnace of the casting and rolling plant in an alternative embodiment,

Fig. 5 shows the second furnace of the casting rolling mill in a further alternative embodiment, and

Fig. 6 shows schematically a casting mill without first furnace with in-line arrangement of casting machine and Vorwalzstraße.

In Fig. 1 an embodiment of a thin slab plant is sketched on which the inventive method for producing strips 1 of grain-oriented silicon steel and multi-phase steel can be performed. There is a vertical casting machine 2, are poured in the slabs 3, for example, 70 mm thickness. On a pair of scissors 12 cutting takes place on the desired slab length. This is followed by a first oven 6, in which the thin slab 3 is brought to about 1,000 to 1,200 ⁰ C Vorwalztemperatur Ti and in which there is a certain temperature compensation in the width direction.

Then, the rough rolling takes place in a rough rolling 4, which consists of one or more stands and in which the slab 3 is rolled to an intermediate thickness. It is flexible, the rolling of a smoothing pass or a high decrease of z. B. 65% possible.

During roughing, the transformation of cast structure into the fine-grained rolling structure takes place. With the choice of the rolling speed on the framework of the rough rolling mill 4, the furnace inlet temperature can also be influenced. In order to produce the most uniform possible properties over the entire cross section of the thin slab, the use of a scale scrubber 13 is optionally dispensed with during the pre-rolling in the rough rolling mill 4 of grain-oriented silicon steel. Behind the framework of the roughing train 4, a second furnace 7 is arranged in the form of a holding furnace or temperature compensation furnace. The second oven 7 offers at least as much space to accommodate a pre-formed thin slab. It can also be provided that there is a commuting or lingering of the pre-formed thin slab in the oven. Instead of a holding furnace 7 is also a Rollgangkapselung possible in this place (for processing, for example, from normal steel). Alternatively, a coil box is placed behind the Vorwalzstraße 4 as a space-saving Vorbandspeicher.

Following this, an induction heater 8 is arranged, with which the thin slab 3 can be brought to the desired elevated temperature T ₂ , relatively uniformly over the cross section. For the rolling of grain-oriented silicon steel, a temperature range of about 1200 to 1350 ⁰ C behind the induction heater 8 is provided. With this method, the precipitates dissolve due to the high temperatures, and advantageous conditions for the subsequent re-separation of the now present in dissolved form elements are created, which ensures the achievement of the desired properties in the final product.

When rolling multiphase steels is a heating to z. B. 1.150 ⁰ C to 1.300 ⁰ C provided.

For the intensive heating above 1,150 ⁰ C so the inductive heating is provided. After heating, the finish rolling takes place in the finishing train 5, ie in a multi-stand finishing roll on the desired finished strip thickness and finished strip temperature and then the strip cooling in a cooling section 14 and ultimately the winding on a reel 15th

When rolling normal steel on the system shown behind the induction heater 8 only (normal) temperatures of about 1100 to 1150 ⁰ C, in some cases may even less necessary. Ie. the Thin slab can be flexibly heated - if necessary - to high or lower temperatures after pre-deformation.

For economic heating or processing of z. B. normal steel is also optionally provided that the induction heater 8 is designed to be transversely displaceable, so that alternatively instead of the induction heater 8, a conventional oven (such as the first oven 6) can be pushed into the transport line.

Furthermore, it is alternatively provided to carry out a high-temperature heating using the so-called DFI oxyfuel process (DFI: direct flame admission) or the conventional oxyfuel process instead of the induction heater 8. For this process EP 0 804 622 B1 and the contributions of J. v. Chr. Scheele et al. "Oxygen instead of hot air", Energy 01/2005, pp. 18-19, GIT Verlag GmbH & Co. KG, Darmstadt, as well as S. Ljun- gars et al. "Successful conversion of continuous furnaces to oxyfuel operation", GASWÄRME International, 54, No. 3, 2005.

This is a special furnace in which pure oxygen instead of air and gaseous or liquid fuel mixed and the flame z. T. is directed directly to the slab. This not only optimizes the firing process, but also reduces nitrogen oxide emissions. The scaling properties are also favorable or the growth of scale is low. With this method, similarly high heat densities can be achieved with good efficiency, as in inductive heating. Furthermore, a minimal oxygen excess or an oxygen deficiency during combustion can be set.

It is also possible to equip the entire heating area behind the rough rolling mill with the DFI oxyfuel kiln or the conventional oxyfuel kiln, ie the high-temperature kiln, in order not to use two different heating systems (induction, flame) in one plant. Such a solution is illustrated in FIG. 2. In order to keep the formation of scale in the first furnace 6 low and to reduce the furnace length, it is provided in the further embodiment of the invention to equip the first furnace 6 behind the casting machine 2 also with the efficient DFI oxyfuel process, even if only temperatures here be set from about 1,150 ⁰ C.

The DFI oxyfuel process can advantageously be used for thin-slab heating also in plant variants which have no roughing stand. This is especially true when there is little scale and the kiln length should be short.

Other alternatives, especially different furnace arrangements behind the rough rolling mill 4, are shown in FIGS. 3, 4 and 5.

FIG. 3 shows the arrangement of an induction heater 8 directly behind the pre-deformation in the framework of the rough rolling mill 4. The induction heater 8 is followed by a conventional furnace 9. With this constellation, a longer stay (hold) at high temperatures can be accomplished. This is intended for the adjustment of desired metallurgical properties for silicon steel and multiphase steel.

In Fig. 4, the inductive heating is divided, namely in a front in the conveying direction F induction heater 8 and a rear induction heater 11, wherein between the two induction heaters 8, 11, a conventional oven 9 is arranged.

In Fig. 5, the division of the conventional furnace 9 and 10 takes place behind the Vorverformungsgruppe; between the induction heater 8 is arranged. Instead of induction heating 8, the DFI oxyfuel heating can also be provided here again. In this case, the residence time behind the Vorverformungsgruppe can be further extended. To extend the storage time in the oven at elevated temperatures, ferries and ovens next to the main transport line are provided as additional storage.

The proposed plant constellation shows the possibilities of a high-temperature furnace behind a pre-deformation group, which consists of the combination of a conventional furnace with an inductive heating or a special furnace with DFI oxyfuel technology. This makes it possible to produce normal materials, but also special materials, in particular grain-oriented silicon steels. Ie. In this thin slab plant, the temperature control can be flexibly adapted, so that here the special grain-oriented silicon steel but also normal steel, such. B. soft carbon steel or microalloyed steels, roll.

As mentioned, conventional ovens, roller box casings, special ovens and / or induction heaters may be arranged in any order between pre-forming and finish rolling. The induction heating is optionally transversely displaceable so that replacement with a conventional oven can take place.

The temperature control in the furnace after the pre-deformation can be adjusted individually depending on the material produced (grain-oriented silicon steel, multiphase steel or normal steel).

The descaling of the grain-oriented steel shortly before the pre-deformation takes place, if at all, preferably at a low water quantity of less than 50 m ³ / h / m and a high pressure of more than 400 to 600 bar.

It is provided by the process control (casting speed, rolling speed in the pre-deformation, tracking), the furnace inlet temperature to and to control the hold time in the oven behind the pre-deformation group.

A DFI oxyfuel furnace is optionally also provided for the heating of the thin slab directly behind the casting machine 2, for CSP plants with and without pre-deformation.

In Fig. 6, an alternative embodiment of a thin slab system is shown schematically. Here, the heating in a first furnace (before the first rolling train 4) is dispensed with and instead the casting heat is utilized. Directly after a casting system 2, after the high-pressure descaling 13 3 inline the thin slab rolled at a temperature Ti of about 1000 ⁰ C to 1200 ⁰ C in the roughing train. 4 The control of the inlet temperature Ti is done by adjusting the continuous casting cooling and casting speed. In this variant, the casting plant and the roughing group are coupled. When the desired intermediate strip length is reached, cutting takes place on the shears 12 behind the rough rolling mill 4. The furnace 7 can be dimensioned such that the intermediate strip can fit into it. The further processing, ie heating to the elevated temperature T ₂ , and finish rolling, etc., takes place in the manner described above. Alternatively or additionally, a coil box is arranged behind the pre-rolling line 4 and Scheere 12 as a space-saving Vorbandspeicher.

As a special case, the system shown can also be operated alternatively or alternatively in endless mode. D. h., The casting machine and the roughing and finishing mill are then coupled together and the rolling is done with casting speed. The cutting to the desired tape length takes place during continuous rolling just before the reel. For the roll change is previously switched from continuous operation back to batch mode. For the roll change, the casting speed can be reduced and / or the prefabricated road pull-in speed can be increased. For the mechanical protection of the induction heater from damage Rieht- or hold-down rollers and / or a camera for ski detection behind the pre-deformation or before the induction heating and an individual influence on the working roll speeds and different diameters on the roughing stand for avoiding skiing are provided.

Alternatively, of course, as already mentioned, other material can be processed on the system described.

Depending on the material, however, the temperature control is adjusted and different defined temperatures T _{2 are set in} front of the finishing train 5 and the components described in the second furnace 7 are used or activated.

While the second furnace 7 primarily serves as a holding furnace at normal steel, a defined elevated temperature is in silicon steel but also in addition to various micro-alloyed steels or multi-phase steel according to the roughing train (z. B. greater than 1150 ⁰ C to 1350 ° C) in the second furnace 7 adjusted and thus positively influenced the properties. That is, the invention or setting the increased intermediate temperature T ₂ is not limited to silicon steel, but is also provided for microalloyed steels and multi-phase steels.

LIST OF REFERENCE NUMBERS

1 band

2 casting machine

3 slab

3 'remodeled slab

4, 5 rolling mill

4 roughing line

5 finish rolling mill

6 first oven

7 second oven (high temperature oven)

8 induction heating /

Device for direct flame treatment of the slab

9 conventional oven

10 conventional oven

11 induction heating /

Device for direct flame treatment of the slab

12 scissors

13 tinder scrubber

14 Kϋh Istrecke

15 reel

F conveying direction T ₁ roughing temperature T ₂ Defines elevated temperature before finish rolling

Claims

claims:

1. A method for producing strips (1) of steel, preferably of silicon steel, in particular of grain-oriented silicon steel, or of multi-phase steel or of a steel with comparatively high alloy contents, in which first in a casting machine (2) a slab (3 ), which is then rolled in at least one rolling train (4, 5) to the belt (1) and wherein before and / or behind the at least one rolling train (4, 5) heating the slab (3) in at least one furnace (6, 7) takes place,

characterized,

that the slab (3) behind the casting machine (2) and before a roughing line (4) in a first furnace (6) to a roughing temperature (Ti) is heated or the slab (3) using the casting heat without the presence of the first Furnace (6) in the roughing mill (4) passes that the slab (3) is then rolled in the roughing mill (4) that the slab behind the roughing mill (4) in a second furnace (7) to a defined temperature (T ₂ ), which is higher than the rough rolling temperature (TO), is heated and then the slab (3) is rolled in a finishing train (5) to the final strip thickness.

2. The method according to claim 1, characterized in that the rough rolling temperature (Ti) is between 1000 ⁰ C and 1200 ⁰ C.

3. The method according to claim 1 or 2, characterized that the defined elevated temperature (T ₂ ) is between 1,150 ⁰ C and 1,350

° C is.

4. The method according to claim 3, characterized in that in the case of processing of silicon steel, the elevated temperature (T ₂ ) above 1.200 ⁰ C.

5. The method according to claim 3, characterized in that in the case of processing of multi-phase steel, the elevated temperature (T ₂ ) is below 1.300 ⁰ C.

6. The method according to any one of claims 1 to 3 or 5, characterized in that the band (1) in the case of processing multi-phase steel during a predetermined holding time at the elevated temperature (T ₂ ), preferably at 1150 ⁰ C to 1.300 ⁰ C, until uneven distributions of alloying elements (segregations) have at least partially, preferably completely, degraded.

7. The method according to any one of claims 1 to 4, characterized in that the band (1) in the case of processing grain-oriented silicon steel for a predetermined holding time at the elevated temperature (T ₂ ), preferably at 1200 ° C to 1350 ⁰ C, is held until the different types of precipitates have been at least partially, preferably completely dissolved.

8. The method according to claim 6 or 7, characterized in that the tape (1) is stored during the predetermined holding time in a ferry or in an oven in or adjacent to the main transport line.

9. The method according to any one of claims 1 to 8, characterized in that the heating to a defined elevated temperature (T ₂ ) takes place at least partially by induction heating.

10. The method according to any one of claims 1 to 8, characterized in that the heating to a defined elevated temperature (T ₂ ) at least partially by direct flame impingement of the slab (3).

11. The method according to claim 10, characterized in that the direct flame impingement of the slab (3) is effected by a gas jet with at least 75% oxygen, in which a gaseous or liquid fuel is mixed.

12. The method according to any one of claims 1 to 11, characterized in that the rolling of the slab (3) takes place in batch mode.

13. The method according to any one of claims 1 to 11, characterized in that the rolling of the slab (3) takes place in the endless operation depending on the final thickness to be rolled, the casting speed and the material.

14. The method according to any one of claims 1 to 13, characterized in that the driving with the steps casting, pre-rolling at a first temperature (Ti) and subsequent heating to an elevated temperature (T ₂ ) and finish rolling both silicon steels and micro-alloyed Steels and multiphase steels done.

15. Device for producing strips (1) of silicon steel, in particular of grain-oriented silicon steel, or of multiphase steel, which comprises a casting machine (2) with which a slab (3) can be cast, and which further comprises at least one rolling train ( 4, 5), with which the band (1) can be rolled, wherein before and / or behind the at least one rolling train (4, 5), a furnace (6, 7) for heating the

Slab (3) is arranged, in particular for carrying out the method according to one of claims 1 to 14,

characterized,

a first furnace (6) is arranged between the casting machine (2) and a roughing train (4), with which the slab (3) is heated to a roughing temperature (T ₁ ) or alternatively (without furnace) the casting temperature (Ti) can be exploited, and that behind the roughing train (4) and before a finishing train (5), a second furnace (7) is arranged, with which the

Slab (3) to a defined temperature [J ₂ ] before completion can be heated, wherein the second furnace (7) is designed as a high-temperature furnace.

16. The apparatus according to claim 15, characterized in that the second furnace (7) comprises an induction heater (8).

17. The device according to claim 15, characterized in that the second furnace (7) comprises means (8) for direct flame impingement of the slab (3).

18. Device according to one of claims 15 to 17, characterized in that the second furnace (7) comprises a conventional furnace (9).

19. The apparatus according to claim 18, characterized in that arranged in the conveying direction (F) of the slab (3), first a conventional oven (9) and then an induction heater (8) or means (8) for direct flame loading of the slab (3) is.

20. The apparatus according to claim 18, characterized in that in the conveying direction (F) of the slab (3) first an induction heater (8) or a device (8) for direct flame impingement of the slab (3) and then a conventional furnace (9 ) are arranged.

21. The device according to claim 18, characterized in that in the conveying direction (F) of the slab (3), first a conventional oven (9), then an induction heater (8) or means (8) for direct flame exposure of the slab (3) and then another conventional oven (10) is arranged.

22. The device according to claim 18, characterized in that in the conveying direction (F) of the slab (3), first an induction heater (8) or means (8) for direct flame exposure of the slab (3), then a conventional furnace (9) and then another induction heater (11) or means (11) for direct flame exposure of the slab (3) is arranged.

23. Device according to one of claims 15 to 22, characterized in that in front of the first furnace (6) a pair of scissors (12) is arranged.

24. Device according to one of claims 15 to 23, characterized in that the first rolling train (4) consists of a single roll stand.

25. Device according to one of claims 15 to 23, characterized in that the first rolling train (4) consists of several rolling stands.

26. Device according to one of claims 15 to 25, characterized in that a roller shutter capsule is provided which can be pivoted or introduced into the production line instead of a conventional furnace (9) or instead of the induction heater (8).

27. Device according to one of claims 15 to 26, characterized in that behind the rough rolling mill (4) a coil box is arranged.

28. Device according to one of claims 15 to 27, characterized in that the at least one induction heater (8) or the at least one device (8) for direct flame impingement of the slab (3) in the direction transverse to the conveying direction (F) of the slab (3 ) is arranged displaceably.

29. The device according to claim 28, characterized in that at least one conventional oven is provided, which is arranged displaceably in the direction transverse to the conveying direction (F) of the slab (3) to the induction heater (8) or the device (8) direct flame exposure to replace.

30. Device according to one of claims 15 to 29, characterized in that the first furnace (6) arranged upstream of the roughing train (4) comprises means for directly or indirectly exposing the slab to flame, in which an oxygen-fuel mixture is used.

31. Device according to one of claims 15 to 30, characterized in that the roughing train (4) is arranged directly without the presence of the first furnace (6) behind the caster (2).

32. Device according to one of claims 15 to 31, characterized in that parts of the first furnace (6) or the second furnace (7) are designed as a ferry.

33. Apparatus according to claim 32, characterized in that the ferry is designed as a pendulum or transverse ferry or as Coilfähre to storage of a thin slab or a deformed thin slab in an oven next to the main transport line of a 1- or 2-strand caster enable.

34. Device according to one of claims 15 to 33, characterized in that prior to the pre-deformation of the slab (3) means for Hochdruckentzun- tion are arranged.

35. Apparatus according to claim 34, characterized in that the means for high pressure descaling for operation with a

Pressure between 400 and 600 bar are formed.

36. Device according to one of claims 15 to 35, characterized in that it further comprises Rieht- or hold-down rollers and / or a camera for ski detection.

37. Apparatus according to claim 36, characterized in that the Rieht- or hold-down rollers and / or the camera in front of an induction heater (8) are arranged or is.

38. Apparatus according to claim 37, characterized in that at least one crop shear is arranged immediately in front of the induction heater (8).

39. Apparatus according to claim 38, characterized in that two cropping scissors are arranged without intervening rolling stand one behind the other.

40. Apparatus according to claim 39, characterized in that the two cropping shears are formed differently.