EP2651578A1

EP2651578A1 - Rolling mill for producing steel for tubes and thin strip

Info

Publication number: EP2651578A1
Application number: EP11799672.8A
Authority: EP
Inventors: Jürgen Seidel; Christoph Klein
Original assignee: SMS Siemag AG
Current assignee: SMS Group GmbH
Priority date: 2010-12-16
Filing date: 2011-12-14
Publication date: 2013-10-23
Anticipated expiration: 2031-12-14
Also published as: CN103249506A; EP2651578B2; WO2012080368A1; EP2651578B1; RU2013132544A; US20130263634A1; RU2552802C2; CN103249506B; DE102010063279A1

Abstract

The invention relates to a rolling mill for producing metal strips, preferably steel for tubes and/or thin strip, in which the temperature control can be influenced between the finishing stands Fi and Fi+1 using a rapid heating device (induction heater), characterized in that the distance between the stands Fi and Fi+1, between which a rapid heating device is arranged, is 5 to 25 m, and in addition to an induction heater, a roller flattening unit (for example, roller leveller 14) and/or shears 8 and/or a driving roller pair 12 and/or a descaling sprayer 15 are arranged as additional units between the two stands. The roll stand Fi and/or regions in front of the roll stand Fi further comprise actuators for influencing the strip warping and/or strip turn-up/ -down (ski) at the strip head.

Description

Rolling mill for tubular steel and thin strip production

The invention relates to a rolling train, in particular a CSP plant for the produc- tion of strip, in particular Röhrenstah l, and / or thin strip, comprising a casting apparatus for producing a thin slab and a rolling mill for rolling the thin slab to a strip or thin strip.

The production of steel strip or steel sheet by hot rolling is well described in the art. Corresponding disclosures can be found, for example, in the contribution of P. U ranga, A. I. et al. "Improvement of Micro Structural Homogeneity in Themomechanical Processed Nb Steels by Thin Slab Casting", 43 ^rd Mechanical Working and Steel Processing Conference, Charlotte, ISS, Vol 39, pages 51 1-529;.. In the article by C. Klinkenberg, et al " Processing of Niobium Microalloyed API Grade Steel on a Thin Slab Plant ", Materials Science Forum Vols. 500 to 501, 2005, pages 253 to 260, and in the contribution of SV Subramanian, et al., "Process modeling of microalloyed steel for near net casting" Proc. Of the Int. Conf. On Thermomechanical Processing: "Mechanics, Microstructure ed by EJ Palmiere et al., The University of Sheffield, Sheffield, 2003, pp. 148-156.

CSP (Compact Strip Production) plants are cast roll mills where two separate process stages for the production of steel strip are closely linked, namely the casting of liquid steel into thin slabs in the casting plant and the rolling of thin slabs into steel strip the rolling mill. In this case, usually the rolling of the pre-potted strand is done directly by utilizing the casting heat or by Adjustment of the desired rolling temperature by means of a leveling furnace or a heating device between the caster and the rolling train.

Conventional rolling mills of a thick slab system have at least one roughing stand or heavy plate framework and one finishing mill behind this roughing stand or heavy plate framework at some distance. While in the roughing stand or heavy plate stand usually reversing the thin slab is rolled to an intermediate strip of predetermined thickness, the rolling takes place within the finishing train in tandem, to which the finishing train is formed as Konti-road. While the distance between the individual stands of such finishing lines is usually constant and is usually about 5.5 meters, the distance between the roughing stand and the first stand of the finishing train is usually many times higher to ensure the reversing rolling operation in the roughing stand or heavy plate stand to be able to. Distances between the roughing stand or plate mill and the finishing mill of about 50 meters or more are not uncommon in this context.

Conventional rolling mills have a long length due to a usually aligned arrangement of thick slab discharge chute of the slab furnace, roughing stand and finishing train, and more powerful scaffolding is required, which makes the investment cost high.

Energetically, the conventional rolling mills are inferior to the CSP plants.

Particularly in thin strip production, the input temperature into the finishing mill is very low, which makes thin strip rolling difficult. The production of tube sheets in a conventional hot strip mill is very time consuming because of the necessary temperature control and reduces the

Production of a conventional hot strip mill. It was therefore an object of the invention to provide a rolling train of the type described above, by means of which the disadvantages described above can at least be reduced. In the context of the invention, this object is achieved with a rolling train, comprising the features of claim 1. Advantageous embodiments of the invention are defined in the dependent claims.

The rolling mill according to the invention, in particular a CSP plant, preferably consists of a compact rolling mill for producing metal strips, preferably tubular steel and / or thin strip, in which the temperature is maintained between two successive finishing stands Fi and Fi + 1 with the aid of a rapid heating device, in particular Induction heating can be influenced. In this case, in addition to the rapid heating, a straightening unit preferably a roller leveler and / or scissors and / or optionally a scale scrubber or other belt cooling device between the scaffolding Fi and Fi + 1 may be arranged. All facilities are placed so compactly that they fit into a framework distance between 5 and 25 m. Furthermore, the scaffold Fi in front of the rapid heating device is preferably provided with actuators for influencing the band curvatures and / or skis on the band head.

Together with a straightening unit, preferably the roller straightening machine, and / or the scissors and the above-described actuators can be guaranteed in the limited space safe passage through the Schnellaufheizvorrichtung, in particular induction heating, with a minimum passage dimension in the thickness direction. Due to the process rapid heating device, scissors and / or scale scrubber can be used depending on the product to be rolled or driven transversely out of the rolling line or there alternatively be arranged a roller table with or without thermal insulation or table. Also for the Dünnbandwalzung the scissors between be provided to the scaffolds to be used at the head and / or at the end and to ensure as straight as possible heads and ends of the formed band.

Due to the additional facilities between the scaffolds, the normal scaffold spacing increases, for example> 5.5 m. To eliminate a possible additional Sekundärzunderbildung a single-row scale washer is preferably provided, which is compact and preferably located in front of the scaffold Fi + 1 behind the Schnellaufheizvorrichtung. When rolling belts with higher surface requirements (eg during thin strip rolling), the scale scrubber can be activated in front of the scaffold Fi + 1. In the production of tubes, the scale washer can optionally be deactivated or driven out of the rolling line.

To save space, optional can be dispensed with a Looper, instead of a minimum tension control can be provided with or without Zugmessrolle.

Compared to a conventional rolling mill with induction heating between roughing and finishing line is significantly reduced by the inventive use of a rolling mill, preferably the rolling mill of a CS P plant with the corresponding additional units of the installation space of a rolling mill. The use of optionally retractable in the rolling line additional units within the finishing mill can support the rolling process in terms of both the process management and in terms of the structure adjustment in the rolled product overall advantageous. These auxiliary units require little space in the sense of the invention and are arranged between two finishing stands, whose distance is 5 - 25 m. In other words the space requirement between two scaffolds with the additional aggregates is much smaller than the intermediate strip length rolled there.

Preferably, the thin slab, which is preferably produced in the casting device of a CSP plant, has a thickness of <120 mm. This provides a CSP system which can be used without the use of a reversing roughing mill, and preferably using just a variety of ready-to-drive-to-drive wheels We produce the desired product range from thick tube tape to thin strip.

As an example and preferred embodiment, the method and production of tube tape in a CSP plant may be described. The TM process (thermo-technical process) in CSP plants usually consists of the step of one or more transformations of the austenitic starting structure in the recrystallizing temperature range to produce a uniform, fine, recrystallized austenite structure, and the subsequent step of one or more recrystallized transformations, austenitic structure to produce as flat as possible, dislocation rich, non-recrystallized austenite structure (so-called pan-cake structure). These steps are also referred to as austenite conditioning.

Finally, in a further step, the cooling of the austenitic microstructure conditioned by means of the first step for producing a fine-grained microstructure in the finished hot strip or hot sheet in the phase transformation takes place. The microstructure of the finished hot strip or hot plate then consists of the combination of ferrite, perlite, bainite and martensite, wherein the content of these four structural components can be between 0% and 100%. Following the above description of the TM method, it is also possible to dispense with the aforementioned step of forming in the non-recrystallizing temperature range of the austenite. In this case, the conditioning of the austenite takes place entirely in the re-crystallizing temperature range of the austenite.

The difficulty with thermo-mechanical hot rolling, however, is that to produce the uniformly finely re-crystallized austenite grain in the recrystallizing region as large as possible deformation must be applied. A finely recrystallized microstructure is characterized in that both the former, non-uniform casting structure and individual coarse grains or microstructure areas are completely converted into a uniform, finely recrystallized microstructure with a small scattering about the average grain size. Often, these conditions are not or not fully met and result in insufficient conditioned austenite structure.

If the step of hot rolling in the recrystallizing temperature range of the austenite is followed by a step in the non-recrystallizing temperature range of the austenite, with a large ratio of the thickness of the finished hot strip and / or hot plate and the thickness of the slab or intermediate strip, there is often little residual deformation for the subsequent transformations in the thermomechanical treatment. Even when switching off individual scaffolding this is sometimes not sufficient to convert any remaining remains of the casting structure and individual coarse grains or microstructure areas in a uniform, flat pan-cake microstructure of non-recrystallized austenite grains. In this case too, there is insufficiently conditioned austenite. However, insufficiently conditioned austenite leads disadvantageously in the finished hot strip or hot sheet to individual coarser grains outside the normal distribution around the mean grain size and / or to the structural regions whose substructure is characterized by small-angle grain boundaries. However, such microstructures lead to poorer mechanical properties of the finished strip or sheet, in particular to a reduced toughness.

According to the description of the TM process given above, the deformation in the recrystallizing region of the austenite is of decisive importance for the properties of the finished steel strip or sheet. Although the degree of deformation required in the first step of the thermomechanical treatment can be partially replaced by a raised inlet temperature, this possibility is limited by the maximum oven temperature as well as the cooling in the roller contact and by thermal radiation between the stands, if involved in this step several scaffolds are.

A CSP system is preferred in which a heating device is arranged between at least two stands Fi and Fi + 1 of the rolling train, in particular between the first stand F1 and the second stand F2. If necessary, this heater can also be designed to be retractable out of the rolling train and into it. Particular preference is given to an induction heating device, in particular having one to four inductor elements. Overall, a compact design as possible with high power density is sought in such a heating device. This power density is preferably in a range of at least 1500 megawatts per square meter, preferably about 4000 megawatts per square meter, as measured by the power density actually introduced into the band or induced in the band. In this case, the term inductor element designates that component via which the power is introduced into the strip. One or a plurality of inductor elements may thus form an induction heater.

On the plant side, the rolling mill is preferably used as a continuous line, in which the high-temperature forming steps described above in the embodiment are used, and where appropriate with the aid of the heating device between the finishing stands and, in the case of optional cooling, low-temperature rolling becomes. In this case, no roughing stand or heavy plate framework, as is customary in a thick slab installation, is used.

Preferably, the forming steps are coupled, that is, all scaffolding involved are simultaneously engaged after Dünnbrammen- or Zwischenbandeinlauf. Here, the rolling stands are driven in tandem operation, thus in a mode of operation in which the thin slabs or the intermediate belt simultaneously pass through all the rolling stands. However, individual scaffolding can also be driven up and therefore not participate in the forming work.

In continuous operation, a method can be used in which the cast strand does not have to be divided by slicing into slabs, but rather continuously, and preferably continuously, by means of a tunnel, to which it is fed to the hot rolling mill Rolled rolled hot rolled, cooled and only before the reel transversely divided and then wound into coils. This procedure reduces the amount of scrap because there are no head and foot ends of the band. In addition, thinner strip thicknesses, preferably with a thickness of <1 millimeter, can also be produced, since the risk of cobb les when thin strips are fed into the last stands of the hot rolling mill is limited to starting. When endless rolling is the Feeding speed of the first active stand reduced to the casting speed, which can lead to increased temperature losses before and / or during the hot rolling. Therefore, higher rolling temperatures and thus heating of the belt are required for rolling in order to avoid rolling end temperatures in ferrite phase and / or in two phase area austenite plus ferrite.

Such a method and the illustrated devices also allow in principle the production of steel grades with reduced austenite phase region, for example with silicon contents of> 1, 0 percent. In this case, higher rolling temperatures are required for rolling in order to reliably control rolling end temperatures in the ferrite phase and / or in the two-phase region austenite plus ferrite. D e ra rt i g e S ta l g u te n s w ith or th e on the e c e of the CSP plant according to the invention can be produced.

In the production of the strip or thin strip, as already described above, an induction heater is advantageously installed between the front scaffolds or, for the time being, retracted into the area between the front scaffolds. Preferably, induction heating is used between the first and second or / and the second and third stands of a finishing train.

Induction heating, however, is characterized by a comparatively low passage dimension in the thickness direction and is a sensitive component. When rolling in a finishing train, especially in the first scaffolding, so-called skis or other band buckling or unevenness often occur on the head, which endanger safe passage of the tube belt or thin strip by the induction heating or other aggregates (scissors, tinder scrubber) between two finishing stands , In addition, the above-mentioned ski-up or down phenomenon, the threading of the pre-rolled intermediate band in a severely hamper subsequent framework. In the worst case, the intermediate belt damages aggregates between the two finishing stands.

The minimization or elimination of the ski can be done for example by means of suitable hold-down rollers or by means of a Biegerichttreibers. However, it is highly preferred if, within the system according to the invention, the pre-rolled intermediate strip head is cut by means of a suitable shearing device. Optionally, a pre-rolled intermediate strip at the top and ends can be scooped up with such a pair of scissors if thin finished strips are to be produced in batch mode.

In a further preferred embodiment of the system according to the invention, depending on the rolled strip material, a descaling in the rolling direction behind the heating of the intermediate belt, optionally after passing through the belt by the heater and a downstream pair of drive rollers before entering the intermediate belt in one or more further finishing stands , This ensures that a virtually contamination-free thin strip or tubular strip can be finish rolled without tinder damaging the strip or strip surface.

In order to ensure a safe passage of the intermediate belt through the devices between two finishing stands, a number of possible actuators are preferably provided according to the invention, which can be used individually or in any combination:

As measures on the rolling stand itself, both an installation of a twin drive and different settings of the roller speed at the top and Bottom roll depending on, for example, the inlet thickness, the thickness decrease, the material or the temperature and different diameters of the upper and lower work roll on.

To influence the temperature distribution of the rolled product in the thickness direction, the setting of the slab or strip cooling in front of the mill stand Fi can be done so that as possible a symmetrical temperature profile over the thickness of the rolling produced or so by targeted Temperaturvertrim m the ski is influenced. Alternatively, a trimming of the slab temperatures at the top and bottom is also possible for this purpose before the scaffold with a heater.

Furthermore, it is provided to carry out a table height adjustment in front of the finishing stand Fi, so that a defined slab or strip entry position into the rolling gap (for example rolling center = nip center) is ensured.

The installation of a straightening unit can also prevent the occurrence of an odd band (ski, curvature, curvature) with particularly simple and controllable means. This device for correcting or avoiding a ski or band curvature in the form of a straightening unit can be a Niederhalterolle, hold-down, Niederhalterstreben, a Biegerichttreiber, tape head straightening channel or a tape head pressing device in addition to a Rollenrichtmaschine.

As already mentioned above, a ski can be cut out of the rolling stock by means of a pair of scissors. Finally, the occurrence of unevennesses in the intermediate band, in particular before entry into the heating device, can preferably be detected by means of suitable surface distance sensors. Suitable sensors are mechanical, optical or other sensors known to those skilled in the art. On the basis of an alarm signal of a controller connected to the sensors, suitable measures for eliminating or reducing the detected odd band curve can be initiated or the intermediate band or slab can again be rejected.

Moreover, the heater can not be protected from damage by band bends only in the manner described above; Also damage, in particular of induction heaters by remaining on the belt or thin strip cooling water can be avoided by the use of suitable blow-off, which is also particularly advantageous between the rolling stands of the finishing train according to the invention or retractable into this place.

The abovementioned additional units and measures for controlling the skis can preferably be used in a CSP finishing line for various application examples. However, it is also the use between finishing stands of a conventional rolling mill conceivable and provided.

The induction heating and auxiliary units may be fixed or laterally moved into or out of the rolling line. As a replacement for moving out aggregates heat insulation hoods can be provided there. The invention will be explained in more detail below with reference to some figures, in which several embodiments of the CSP system according to the invention are shown. In the figures shows:

Figure 1 shows a first embodiment of the invention, in which between two

Scaffolds of a schematically illustrated hot strip mill, an induction heater and a pair of driver rollers are arranged,

a second embodiment of the invention with arranged in the rolling direction in front of the heater means for correcting / avoiding a ski on the intermediate tape head,

Figure 3 shows a third embodiment of the invention

Hot rolling mill with a between a device for correcting / avoiding a ski on the intermediate belt head and a

Scale scrubber behind the arranged heating device, which are all arranged between two rolling stands of a hot rolling mill,

Figur4 a fourth embodiment of an inventive

Hot rolling mill with scissors arranged one behind the other in the rolling direction, rapid heating, pair of driving rollers and descalers, and

Figur5 a fifth embodiment of an inventive

Hot rolling mill. Figure 1 shows a part of a hot rolling mill 2 in a first embodiment according to the invention, in which the metal strip 1 extends through a first stand shown as Fi and a second stand shown as Fi + 1. The distance between the stands Fi and Fi + 1 corresponds to between 5 and 25 m. Immediately after leaving the finishing stand Fi, the belt 1 enters an induction heater 8 and then a pair of driver rollers 12. By this pair of driver rollers 12, a strip tension (even before reaching the tape head in the following frame) applied to the tape 1 and also on the tape 1 remaining water can be easily squeezed. Between the scaffolding Fi and Fi + 1, a minimum tension control can be established. The pair of drive rollers 12 helps to set a precise setting speed on the scaffold Fi + 1. Alternatively, a tension measuring roller or a looper (not shown) is arranged between the stands to ensure mass flow. Finally, in the rolling direction W behind the mill stand Fi + 1 for an application example, a cooling section 1 1 arranged with the heated in the heater 8 to a temperature above the recrystallization temperature band 1 for a previously heated E i nsatzbe play ine Tem temperature range imn Not recrystallizing area is cooled. The two devices 8 and 12 can also be arranged in reverse order. The arrangement of driving roller pairs 12 in front of and behind the heating device 8 is conceivable. FIG. 2 shows a further embodiment of a hot rolling mill 2 according to the invention, of which only the finishing stand Fi and the finishing stand Fi + 1 are shown. Between the rolling stands Fi, Fi + 1, in turn, a heating device 8 is arranged for rapid heating of the metal strip 1 by means of induction heating. In the rolling direction W between the finishing stand Fi and the heating device 8 is a device 14 for correction / prevention a ski on the intermediate belt, which has left the finishing stand Fi, arranged. Such a device 14 for correcting / avoiding ski-ups or downs may be, for example, a bending-course driver or a hold-down roller. Such devices 14 are intended to correct the phenomenon of, for example, a raised tape head after exiting a rolling stand (so-called ski-up), that is, elim inieren or reduce the time to a minimum considered acceptable. This is mainly to avoid downtime due to inaccurate or not successful threading the intermediate tape head in downstream units, such as the rapid heating device 8, other units (scissors, tinder scrubber) or any other rolling stand Fi + 1. In order to avoid the ski phenomenon, the hot rolling mill 2 according to the invention has separate drives for the upper work roll Fia and the lower work roll Fib for a rolling mill, preferably the first rolling stand Fi. As a result, with suitable control of the drives, the ski-up or outside of a ski-down phenomenon can already be limited to minimum values during rolling.

FIG. 3 shows a third embodiment of a hot rolling mill 2 according to the invention, in which a device 14 for correcting a ski on the intermediate belt head, followed by a rapid heating device 8, is arranged between the first illustrated rolling stand Fi and the second illustrated rolling stand Fi + 1. Between the rapid heating device 8 and the mill stand Fi + 1 turn a scale scrubber 1 5 is arranged, can be safely removed on the adhering to the surfaces of the belt 1 scale before the entry of the belt 1 in the mill stand Fi + 1. Optionally, this embodiment of the invention can also comprise a (not illustrated) driver roller pair and / or cooling (not shown). FIG. 4 shows a fourth embodiment of a hot rolling mill 2 according to the invention, in which the first rolling stand Fi and the second illustrated rolling stand Fi + 1 in the rolling direction W of the belt 1, a pair of scissors 13, a Schnellaufheizvorrichtung 8, a pair of drive rollers 12 and a tinder scrubber 15 are arranged. While the rapid heating 8, the pair of driving rollers 12 and the scale washer 15 operate in a similar manner as in the embodiments according to Figures 2 to 4, the scissors 13 serves mainly for cutting the tape head and optionally the tape end, where Walzzungen or Aufbiegungen (see above called skis) can occur. Thus, the scissors 13 on the one hand replaces the ski correction / avoidance devices (not shown) shown in the previous embodiments, the scissors 13 also advantageously assists the further rolling process by cutting off tongues which have a deleterious effect on the barrel in the subsequent rolling process of the belt 1 and for the work rolls of the subsequent stands may have. In Figure 5 ei ne fifth embodiment of a hot rolling mill 2 according to the invention is shown, in which a finishing stand Fi, a device 14 for correcting / avoiding a ski-up, a pair of scissors 13 and a rapid heating 8 are arranged in the rolling direction W of the strip 1. After leaving the rapid heating, the metal strip 1 enters a pair of driver rolls 12, through which residual water resting on the strip 1 is squeezed. After leaving the driver roller pair 12, the metal strip 1 enters the scale scrubber 15, in the residual scale, which has formed on the surfaces of the strip 1, safely before entry of the strip 1 in the finishing stand Fi + 1 is removed. Finally, depending on the application in the cooling 11, the hot strip 1 heated in advance in the rapid heating device 8 can be cooled again and rolled out to the finished strip thickness.

The quick heater 8 and the scissors 13 can be arranged in the direction of tape travel alternatively also arranged vice versa. If the framework distance to be further reduced, the Schnellaufheizvorrichtung 8 and the tinder scrubber 15 can be seen at the same location seen in the strip running direction and alternatively pushed laterally in the rolling line, so that either the zuder scrubber 1 5 or d he Schnellaufheizvorrichtung 8 can be used.

Claims

claims

1 rolling line for producing metal strips, preferably tubular steel and / or thin strip, in which a rapid heating device (8) is arranged between two successive finishing stands (Fi, Fi + 1),

characterized in that

the distance of the scaffolding (Fi, Fi + 1), between which one

Rapid heating device (8) is arranged, 5 - 25 m, and that in addition to Schnellheizvorrichtung (8) at least one other

Additional units, in particular a straightening unit, preferably one

Roller leveler (14), and / or a pair of scissors (13) and / or a

Drive roller pair (12) and / or a scale scrubber (15) between the two stands (Fi, Fi + 1) is arranged.

2. Rolling train according to claim 1, characterized in that the rapid heating device (8) upstream rolling stand (Fi) and / or

Areas in front of and behind this rolling stand (Fi) are equipped with actuators for influencing the belt buckle and / or band skis on the tape head.

3. Rolling train according to one of the preceding claims, characterized in that the rolling stands (Fi, Fi + 1) are finishing stands of a preferably compact Kontistraße.

4. rolling train according to one of the preceding claims, characterized

characterized in that it is preferably a rolling mill in a CSP plant that produces thin slabs with a thickness of <120 mm.

5. rolling mill according to one of the preceding claims, characterized

in that a heating device, in particular a

Induktionsheizvorichtung, preferably with 1 to 4 inductor elements, between the first and the second frame (F1, F2) or / and between the second and third frame (F2, F3) arranged or retractable between them.

6. rolling train according to one of the preceding claims, characterized

in that at least one pair of driver rollers is arranged between a framework (Fi) and the following framework (Fi + 1) or can be inserted between them.

7. rolling mill according to one of the preceding claims, characterized

in that a device for correcting or avoiding a ski on the intermediate belt between a scaffold (Fi) and a subsequent scaffold (Fi + 1), preferably in front of the heater, arranged or retractable between them.

8. Rolling train according to claim 7, characterized in that the

A device for correcting or avoiding a ski is a hold-down roller, hold-down plate, hold-down strut, a Biegerichttreiber, Bandkopf- straightening channel or a tape head-pressing device.

9. rolling train according to one of the preceding claims, characterized

in that at least one rolling stand (Fi) has separate drives for the upper and lower work rolls (Fia, Fib).

Rolling train according to one of the preceding claims, characterized in that in front of a rolling stand (Fi), a belt cooling or heating is arranged, by means of which the temperature distribution over the slab or belt thickness is adjusted to influence the ski and belt buckling.

1 1. Rolling train according to one of the preceding claims, characterized

in that a rolling stand (Fi) on the inlet side a

Table height adjustment, by means of which the tape running position is adjustable.

2. Rolling train according to one of the preceding claims, characterized in that a pair of scissors between at least two

Rolling stands (Fi, Fi + 1) arranged or retractable between them.

3. rolling train according to one of the preceding claims, characterized

characterized in that a scale scrubber between at least two rolling stands (Fi, Fi + 1), arranged or retractable between them.

4. rolling train according to one of the preceding claims, characterized

in that the distance between two successive stands (Fi, Fi + 1) is smaller than the intermediate strip length rolled between the stands.

5. rolling mill according to one of the preceding claims, characterized

characterized in that thermal insulation hoods between at least two rolling stands (Fi, Fi + 1), in particular as a replacement for previously removed units between the rolling stands (Fi, Fi + 1), are arranged or retractable.

6. Rolling train according to one of the preceding claims, characterized in that the rolling train is connected to a process model, via which the various measures and settings for

Skiing influences are controllable and controllable.

7. rolling mill according to one of the preceding claims, characterized

characterized in that the rapid heating device is made compact and the power density induced in the strip is at least 1500 megawatts per square meter, preferably about 4000 megawatts (+/- 18%) per square meter.