EP2032283A2

EP2032283A2 - Method and device for producing a metal strip by continuous casting

Info

Publication number: EP2032283A2
Application number: EP07725460A
Authority: EP
Inventors: Jürgen Seidel; Peter Sudau
Original assignee: SMS Demag AG
Current assignee: SMS Siemag AG
Priority date: 2006-05-26
Filing date: 2007-05-23
Publication date: 2009-03-11
Also published as: US20090165986A1; KR20080108368A; MX2008015067A; JP2009538227A; CA2653360A1; WO2007137739A3; BRPI0712479A2; DE102007022932A1; AU2007267471A1; EG24972A; RU2388573C1; TW200815128A; WO2007137739A2; AR061187A1; KR101068458B1; CA2653360C; AU2007267471B2

Abstract

The invention relates to a method for producing a metal strip (1) by continuous casting. According to said method, a slab (3), preferably a thin slab, is initially cast in a casting machine (2), said slab being deviated from a vertical direction (V) into a horizontal direction (H), and in the direction of transport (F) of the slab (3) arranged behind the casting machine (2), the slab (3) is subjected to a milling operation in the milling machine (4), in which at least one surface of the slab (3), preferably two surfaces which are opposite to each other, are milled. In order to obtain a high economic viability and improved machining parameters when the strips are rolled, the slab (3) is milled as a first mechanical machining step after the slab (3) is deviated in the horizontal direction (H). The slab (3) is cast with a thickness (d) of at least 50 mm and the slab (3) is cast with a mass flow, which is the product of the casting speed and the slab thickness (v x d), of at least 350 m/min x mm. The invention also relates to a device for producing a metal strip by continuous casting.

Description

Method and device for producing a metal strip

continuous casting

The invention relates to a method for producing a metal strip by continuous casting, wherein first in a casting a slab, preferably a thin slab, is poured, which is deflected from a vertical orientation in a horizontal orientation, wherein in the conveying direction of the slab behind the casting machine, the slab of a Milling operation is performed in a milling machine, in which at least one surface of the slab, preferably two opposing surfaces, is milled. Furthermore, the invention relates to an apparatus for producing a metal strip by continuous casting.

Continuous casting of slabs in a continuous casting plant may result in surface defects such as oscillation marks, casting powder defects or longitudinal and transverse surface cracks. These occur in conventional and thin slab casters. Depending on the intended use of the finished strip, therefore, the conventional slabs are partially flamed. Some slabs are generally flamed on customer request. The demands on the surface quality of thin slab plants are continuously increasing.

For surface treatment, flaming, grinding or milling are suitable.

The flame has the disadvantage that the melted material can not be melted down again without treatment due to the high oxygen content. During grinding, metal splinters mix with the grinding wheel dust, so that the abrasion must be disposed of. Both methods are difficult to adapt to the given transport speed. It is therefore primarily a surface treatment by milling on. The hot milling shavings are collected and can be packaged and smelted without processing without problems and thus added back into the production process. Furthermore, the milling cutter speed can easily be adjusted to the transport speed (casting speed, finishing line

Feed speed). The inventive method and the associated device are therefore primarily on the milling.

A method and a device of the type mentioned above with a milling operation or a milling machine, which takes place behind a continuous casting plant or is arranged, is known. Reference is made to CH 584 085 and to DE 199 50 886 A1.

A similar solution is also disclosed in DE 71 11 221 U1. This document shows the processing of aluminum strips using the casting heat, where the machine is connected to the casting machine.

An in-line removal from the surface of a thin slab (flames, milling, etc.) shortly before a rolling train at the top and bottom or only on one side has already been proposed, for which reference is made to EP 1 093 866 A2.

A further embodiment of a surface milling machine is shown in DE 197 17 200 A1. Here u. a. the variability of the milling contour of the milling device, which is arranged behind the continuous casting plant or before a rolling train described.

Another arrangement of an inline milling machine in a conventional hot strip mill for processing a pre-strip and their design EP 0 790 093 B1, EP 1 213 076 B1 and EP 1 213 077 B1 suggest.

In contrast, JP 1031 4908 A describes the flames of the continuously cast strip behind the casting machine.

In DE 199 53 252 A1, the strand cast in a casting machine is first passed through a cross-cutting device and then through various furnaces before it is subjected to a rolling operation.

In the surface treatment of thin slabs in a so-called CSP plant, depending on the surface defects detected, approximately 0.1 to 2.5 mm should be removed from the warm slab surface in the processing line (inline), on one or both sides not to reduce too much, the thickest possible thin slab is recommended (H = 60 - 120 mm).

The surface treatment and associated facilities are not limited to thin slabs, but can also be used in-line behind a conventional slab caster and in slabs cast to a thickness of more than 120 mm up to 300 mm.

The inline milling machine is generally not used for all products of a rolling program, but only for those where higher surface requirements are required. This is advantageous for application reasons and reduces the Fräsmaschinenabnutzung and is therefore useful.

There is a desire to use the previously known technology more efficiently and thus more cost-effectively. This should preferably, but not Finally, thin slabs can be produced in high quality and high mass flow.

For the operating parameters of a continuous casting plant, the following should be noted:

The casting parameters for some parameter examples, which are typically achievable for steels easy to cast, are shown in the following table:

These are speeds that are usually at the upper end of the operating range. For higher strength material with C> 0.3%, silicon steel and microalloyed steel, the speeds are typically 20% lower, i. H. at 350 m / min × mm - 20% = 280 m / min × mm.

It has proven to be disadvantageous that the quality of the slab surface suffers at high mass flow or casting speed.

The present invention is therefore the object of a method and an apparatus of the type mentioned in such a way that can be achieved that with high efficiency, an improved manufacturing process or processing process can take place. In particular, an optimization with regard to the required introduction of heat into the casting strand or into the production process should take place, also and in particular, as far as the subsequent rolling process after casting. The solution of this problem by the invention according to the method is characterized in that the milling of the slab is carried out as the first mechanical processing step after the deflection of the slab in the horizontal orientation, wherein the casting of the slab is at a thickness of at least 50 mm and wherein the casting of the Slab with a mass flow as a product of casting speed and slab thickness of at least 350 m / min x mm done.

Alternatively, it can be provided that the casting of the slab is carried out with a mass flow as the product of casting speed and slab thickness of at least 280 m / min x mm, the material of the slab high-strength material having a carbon content of C> 0.3%, silicon steel or is microalloyed steel. For these materials, the mass flow is therefore 20% lower than mentioned above.

The milling of the slab is preferably carried out immediately after the deflection of the slab in the horizontal orientation. The milling of the slab can also be done after the deflection of the slab in the horizontal orientation and their passage of a thermal compensating section and / or a furnace.

Before or after the milling machine, a measurement of at least one surface parameter of the slab can take place and the setting of the machining parameters during milling can be carried out as a function of the at least one measured surface parameter. Depending on the at least one measured surface parameter, the milling feed preferably takes place. Furthermore, it can be provided that, depending on the at least one measured surface parameter, a bend of at least one milling cutter of the milling machine takes place about a horizontal axis perpendicular to its longitudinal axis.

The slab can be cleaned before measuring the at least one surface parameter. The milling of the slab in the milling machine is carried out according to an embodiment of the invention so that the slab top and the slab bottom are milled in the conveying direction in the same place. Alternatively, however, it can also be provided that the milling of the slab in the milling machine takes place in such a way that the upper side of the slab and the underside of the slab are milled off in the conveying direction at two successive locations.

The apparatus for producing a metal strip by continuous casting, with a casting machine, in which a slab, preferably a thin slab, is poured, wherein in the conveying direction of the slab behind the casting machine at least one milling machine is arranged, in which at least one surface of the slab, preferably two themselves According to the invention, opposing surfaces can be milled, so that means are provided in the conveying direction upstream and / or downstream of the milling machine with which at least one surface parameter of the slab can be measured, with adjusting means being provided by which the at least one milling cutter the milling machine can be adjusted depending on the measured surface parameter.

This adjusting means can be designed to adjust the milling delivery of the milling cutter. It is also possible that the adjusting means for acting on the milling cutter are formed with a bending moment about a horizontal axis perpendicular to the milling cutter longitudinal axis. This results in the advantages explained in more detail later.

The means for measuring at least one surface parameter may include a camera for determining the depth of cracks on the slab surface. Furthermore, the means for measurement may allow the determination of the geometric shape of the slab across its width transversely to the conveying direction. The means for measuring at least one surface parameter can be arranged directly behind the milling machine. They can also be arranged behind a finishing line located behind the milling machine in the conveying direction. It has also proven to be useful if the means for measuring are arranged behind a cooling section located behind the milling machine in the conveying direction.

With the proposed solution it is possible to drive a high casting speed and to operate the directly and coupled subsequent rolling process optimally. In particular, this achieves acceptable strip outlet temperatures from the finishing train.

This leads to a qualitatively improved production of slabs, in particular of thin slabs.

It is possible by means of the invention in particular, the casting speed of the previous level to v x d> 350 m / min x mm to about 480 - 650 m / min x mm, d. H. to increase by about 30% to 75%. This results in an advantageous manner,

that the productivity of the plant can be increased,

that a sufficiently high production is possible even with a continuous casting plant with low investment costs and

that high rolling temperatures are ensured, in particular in the case of endless casting rolls, especially when surface milling takes place before the rolling process instead of descaling.

In an advantageous manner, a high quality of the slab results when the milling machine arranged behind the casting installation or, if appropriate, another ren surface processing machine by removing surface defects.

The interaction of a high-speed casting plant and the surface removal, in particular milling, is of crucial importance for the quality, in particular the surface quality of the product produced.

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

1 shows schematically the side view of an apparatus for producing a metal strip by continuous casting, in which a milling machine, a roughing mill, a heating, a finishing train and a cooling section adjoin a casting machine,

2 shows an alternative embodiment of the invention to FIG. 1, in which the milling machine is arranged behind an oven and in front of a finishing train and a cooling section, FIG.

3 shows the front region of the device according to FIGS. 1 and 2 according to a further alternative embodiment of the invention,

4 shows a part of the device according to FIGS. 1 and 2 according to a further alternative embodiment, wherein measuring means and adjusting means are provided with which the milling process can be influenced,

5 shows schematically the course of the casting defects over the casting speed,

Fig. 6 shows an example of the course of the delivery of the milling cutter when milling the slab over the slab length or over time and Fig. 7 shows a cutter in the front view, which is acted upon by a bending moment.

In Fig. 1, an apparatus for producing a metal strip 1 is shown by continuous casting. The corresponding slab 3 is continuously cast in a casting machine 2 in a known manner. The slab 3 is preferably a thin slab. In the strand segments 11 of the cast strand is deflected in a known manner from its orientation in the vertical direction V in the horizontal H or bent. Immediately after the deflection into the horizontal H, a profile measurement and surface inspection can be carried out by means 8 for measurement. Thus, the surface texture of the slab and its geometric design can be detected.

In the conveying direction F is followed by the means 8 a milling machine 4, in which the slab 3 can be milled off at its top and bottom.

It is essential that the milling of the slab 3 takes place as a first mechanical processing step after the deflection of the slab 3 into the horizontal orientation H at a high casting speed. Specifically, it is provided here that the milling of the slab 3 takes place immediately after the deflection thereof into the horizontal orientation H.

In the production of slabs as high-speed thin slabs, technological advantages are achieved by the specific direct readjustment of the milling process to the casting, as will be seen. The casting defects increase with increasing casting speed in such a way that the immediately downstream milling represents an efficient preparation of the slab for the subsequent process steps, so that overall a very economical process becomes possible. Accordingly, it is desired that the casting of the slab 3 takes place with a thickness of at least 50 mm. As a mass flow (expressed as the product of casting speed and slab thickness), a value of at least 350 m / min × mm has been proven. The interaction of these process parameters with the far ahead milling of the slab gives great advantages in terms of achievable slab quality and cost-effectiveness in the production.

Behind the milling machine 4 is followed in the solution of FIG. 1, a roughing train 12 at. This is followed by a furnace 13, which is designed here as inductive heating. After a descaling 14, the slab then enters a finishing train 9. Behind this, a cooling section 10 is arranged in the conveying direction F.

The plant shown in Fig. 1 is particularly well suited for the continuous rolling of the slab 3. The coupling of casting and rolling results in high casting speed, an economical process and a favorable heat balance in the plant.

The alternative plant shown in Fig. 2 is similarly constructed and particularly well suited for a combined endless or alternatively discontinuous rolling.

In accordance with the solution according to FIG. 1, after the cast strand has been deflected into the horizontal H, a profile measurement and surface inspection with the means 8 are provided. This is followed by a holding furnace or a roller shutter encapsulation 15. This is followed by the furnace 13, which is designed as an inductive heating.

Instead of descaling 14 in front of the finishing train, a milling machine 4 is placed in front of the finishing train 9 for the purpose of temperature optimization, wherein inductive heaters 16 can be arranged between the individual rolling stands. Finally, in the conveying direction F, the cooling section 10 follows again. The solution according to FIG. 3 differs from the one according to FIGS. 1 and 2 in that after the deflection of the cast slab 3 - apart from the measuring means 8, which are also provided here again - the milling machine 4 does not immediately follow, but that the slab 3 is first passed through a thermal equalization section 5 or temperature maintenance route in the form of a roller-skated encapsulation. The two cutters 6 of the milling machine 4 are arranged one above the other and work on the slab 3 at the same time on the top and bottom, with the aid of driver rollers 21 and guide plates 22 in front of and behind the cutter by appropriate vertical adjustment of the two elements a division of the milling removal the top and bottom of the slab takes place.

The plant outlined in FIG. 3 is particularly suitable for producing thicker slabs by means of high-speed casting, although the use for thin slabs is by no means ruled out. It is arranged as close as possible behind the casting machine 2 and before the milling machine 4, the insulation of the roller table.

From Fig. 4 it is apparent that the milling process in the milling machine 4 can take place in the closed loop, as far as the milling parameters are concerned.

Here comes the slab 3 from a furnace 13 in the milling machine 4, wherein before the milling machine means 8 are arranged for measuring, with which a profile measurement or a surface inspection can be made.

Here, in the milling machine 4, the slab 3 is also processed again at its top and bottom, ie milled, although the processing at the top and at the bottom at two slightly spaced locations - in the conveying direction F - takes place. The cutters 6 cooperate with support rollers 17. Behind the milling machine 4, in turn, means 8 for measuring are arranged. The slab 3 passes after the surface treatment with high Temperature in a finishing train 9, wherein behind this again means 8 are arranged for measuring.

The means 8 can have measuring elements for the optical determination of the band shape (ski), which is indicated for the foremost means 8 with the reference numeral 8 'in the conveying direction. They can also have flame profile and temperature measuring elements.

4 indicates control / regulating means 18 which receive the measured values of the measuring means 8 as input variables in addition to the set values for the milling amounts for the top and bottom of the slab. They control or regulate the milling process, which is carried out in the milling machine 4, in accordance with stored algorithms.

Primary is thought of the milling amount, d. H. to the delivery of the roller-shaped cutter 6, which defines the amount of material to be machined of the slab 3. This can be done separately and differently for the top and the bottom - depending on the measured values.

The derivation of the Fräsbetrag takes place from the surface inspection of the slab, with cracks and the geometric shape are considerable. This may result in a different decrease (delivery) over the slab length.

When calculating the cutter feed, the calculated cutter wear is also taken into account in a cutter wear model that determines the wear depending on the wear path, milling volume, milling speed, material strength, etc.

It is also possible to determine a fixed milling amount based on the measured values. Another possibility is the adaptation of the cutter shape and bending as a function of the measured profile (see Fig. 7).

Behind the milling machine 4, the surface result can be checked and, if necessary, readjustment can take place if the measured values are still unsatisfactory.

For the background of the proposed procedure, reference is first made to Fig. 5 reference. Here the course of the casting defects E and in particular their frequency over the casting speed v is plotted. The range of the casting speed reaching up to the dashed line is the typical field of application of thin slabs, the slab thickness being, for example, 60 mm. The equally important product of casting speed and casting thickness is at the dotted line v x d = 360 m / min x mm.

The casting errors increase sharply as the casting speed or the product of casting thickness and speed further increase.

FIG. 6 shows schematically the milling removal or milling cutter delivery s over the time t or slab length. The solid line applies to the top of the slab, the dashed line applies to the bottom of the slab. The milling removal, d. H. the delivery s, depends on the detected errors. It can be seen that different values can be specified for the upper side and the lower side of the slab.

FIG. 7 illustrates how, in a particularly advantageous manner in milling operation, the milling result can be influenced as a function of measured values.

Shown is a cylindrical milling cutter 6 with its schematically indicated cutting edges 19. The milling contour, which is correspondingly reproduced by the milling process on the slab 3, can be influenced by a Bending moment M is introduced into the cutter 6. The bending moment M rotates about a horizontal axis which is perpendicular to the cutter longitudinal axis 7.

The torque M can be generated by double forces F _F , which can be introduced into the end-side shaft journal of the milling cutter 6. While the line 7 marks the cutter longitudinal axis in the undeformed state, the bending curve 20 results when the forces FF are introduced. Then the cutter 6 bends as shown. Since the bending behavior of the milling cutter 6 is known as a function of the forces F _F, it is thus possible to influence the milling result in a targeted manner if certain crowns are measured over the width of the slab, which influence the bending moment M specifically by acting on the milling cutter 6, ie can be eliminated.

This can also be done a dynamic adjustment of the milling process to the measured slab profile or to the measured slab shape.

The reference numerals 7 and 20, the neutral fibers of the milling cutter 6 are illustrated for the two load conditions.

The milling removal, d. H. the infeed can be set differently over the slab width or adapted to the incoming slab shape. Actuators for the adjustment over the width are the cutter bends.

In summary, the proposal can be summarized as follows:

Since the production of a CSP plant is determined by the casting machine, the invention offers to design a casting machine with high casting speed. With an extreme increase in the casting speed, instead of a CSP plant with two strands with conventional casting plants, a 1-strand CSP plant with a high-speed casting machine is an alternative. A high casting speed is also particularly necessary in coupled casting and rolling (casting-rolling plant), so that the belt outlet temperatures from the finishing train are acceptable.

However, as the casting speed increases, surface defects (eg, shells, etc.) increase disproportionately (see Fig. 5). When choosing a high casting speed, therefore, the deteriorating thin slab surface quality must be compensated by a surface processing machine, to which the invention provides the milling process. Ie. Thin-slab high-speed casting makes sense with simultaneous use of a thin-slab surface finishing machine to ensure high or acceptable strip surface quality.

In particular, it is proposed to carry out thin slab surface working in thin slabs above 50 mm thickness and / or above mass flow (speed x thickness) of 350 m / min x mm, in the line behind the casting plant, within the furnace or upstream of the rolling train is arranged. The z. B. aspired thin slab thickness is about 60-110 mm at a casting speed of 6-9 m / min. The typical mass flow is lower.

Not only for thin slab plants, increasing the casting speed makes sense. It is also an advantageous application for thick slab plants (H> 110mm) conceivable. Here, the milling machine should be arranged as close as possible behind the continuous casting plant or the area between leaving the casting plants (last segmented roll) and the milling machine should be provided with a roller encapsulation, so that the milling process with high casting speed can take place as high as possible with a high slab temperature.

At the slab head and / or at the end of the slab, if necessary, the milling process can be dispensed with - for the purpose of protection against damage to the milling cutter. Will a unfavorable surface shape (crossbow, ski or other bumps) optically detected, the milling amount, the beginning of the milling and the milling end as well as the cutter profile setting are optionally made dependent on it.

In order to minimize the milling removal and to adapt to the slab entry profile, the milling cutter arrangement forms a "milling radius" across the width (analogous to the "roll crown"). For the purpose of dynamic adaptation to the slab shape, the illustrated milling-roll-pin bend as shown in FIG. 7 is provided.

When inline milling the surface, the slab speed v _Bra mm _{e is given} by either the caster or the rolling mill depending on the milling machine arrangement. Ie. the feed can not be influenced by the milling machine. In order to always set the optimum milling conditions, preferably the cutter speed n _cutter r is according to the equation

nTräser ⁼ KX Veramme

adapted, with K as an empirically determined, material-dependent factor.

The milling speed is controlled by the milling model shown in FIG. 4, which monitors the milling result by means of the surface sensors.

In the illustrated embodiments, a respective milling drum can be seen on the top and bottom. With high required milling removals per side or with very hard materials, it is conceivable to arrange two milling units one behind the other on the top and bottom sides.

As an alternative to the use of milling cutters, it is also possible to use other milling cutters, such as face milling cutters, or grinding tools or other surface removal tools (such as scarfing machines) at the intended locations. As a cutting material for the cutting plates of the milling cutter can be provided in particular: HSS; uncoated or preferably coated hard metals; ceramics; polycrystalline cutting materials. As a rule, commercially available indexable inserts can be used.

As explained, a surface inspection (camera, crack test, roughness test) in front of and / or behind the furnace or in front of the milling machine is recommended. The measured signals are used for optimum use of the milling removal. From this it can be deduced whether one-sided or multi-sided or only partial length ranges are to be milled and which removal is to be set. In order to be able to carry out an accurate or reliable surface analysis, descaling or cleaning of the slab prior to the inspection is preferably preceded.

The benefit of an in-line slab inspection is also in the monitoring of the effect of the casting plant: monitoring the effect of the electromagnetic brake; Optimization of the mold oscillation curves; Surface monitoring at high speed; Detecting cracks, casting powder defects and other early-stage casting defects.

In addition, it is possible to check the milling result or the general surface condition with the surface inspection directly behind the milling machine, behind the finishing train or behind the cooling section. The result is monitored there and the milling amount is optimally optimized or minimized by means of a milling model (algorithm) and thus integrated into the overall system.

The use of the milling cutter or the milling machine can be provided at various locations. It is possible behind the caster, inside the furnace or in front of the rolling mill. It is preferably used immediately before forming, instead of a scale washer, in order, in particular in the case of endless Casting to achieve a high strip temperature in the rolling mill, which is particularly advantageous.

The control of the milling removal, the beginning of the milling and the milling end and the setting of the cutter speed is preferably carried out by means of a Fräsmodells. To determine the infeed, the milling model considers: setpoint values, measured values of the measuring equipment, calculated cutting edge wear, empirical values of previous milling amounts (adaptation).

It is also possible to arrange a plurality of milling cutters per side in succession with higher milling removal.

As an alternative to the use of milling cutters, face milling cutters can also be used. However, in principle, other erosive methods can be used, for. As the use of grinding tools or other mechanical or melting removal tools (such as, for example, scarfing machines). The flames are interesting for high-speed continuous casting.

The inventively addressed first mechanical processing step, which is intended to represent the milling, is to be understood so that it does not come to any mechanical processing before milling, which is typically used in continuous casting. If, for example, prior to milling a slight mechanical processing should take place which is of the order of magnitude not in the typical range of the process (eg slight rolling with a thickness decrease of a few millimeters in a small framework or in a driver, which is typically present anyway ), this is not to be understood as the first mechanical processing in the sense of the invention. LIST OF REFERENCE NUMBERS

1 metal band

2 casting machine

3 slab

4 milling machine

5 thermal compensation section

6 cutters

7 cutter longitudinal axis

8 means of measurement

8 'means for measurement

9 finishing mill

10 cooling section

11 strand segments

12 Vorstr

13 oven

14 descaling

15 holding furnace / walkway enclosure

16 inductive heating

17 support roller

18 control means

19 cutting edge

20 bending course

21 driver roles

22 guide plates

F conveying direction

V vertical H Horizontal d thickness of the slab

V casting speed v x d mass flow expressed by the

Product of speed and thickness

M bending moment

FP power

Claims

Claims:

1. A method for producing a metal strip (1) by continuous casting, wherein first in a casting machine (2) a slab (3), preferably a thin slab, is poured, which deflects from a vertical orientation (V) in a horizontal orientation (H) is, in the conveying direction (F) of the slab (3) behind the casting machine (2) the slab (3) is subjected to a milling operation in a milling machine (4), wherein at least one surface of the slab (3), preferably two opposing Surfaces, is milled, characterized in that the milling of the slab (3) as the first mechanical processing step after the deflection of the slab (3) in the horizontal orientation

(H), wherein the casting of the slab (3) takes place with a thickness (d) of at least 50 mm and wherein the casting of the slab (3) with a mass flow as a product of casting speed and slab thickness (vxd) of at least 350 m / min x mm.

2. A method for producing a metal strip (1) by continuous casting, wherein first in a casting machine (2) a slab (3), preferably a thin slab, is poured, which deflects from a vertical orientation (V) in a horizontal orientation (H) is, in the conveying direction (F) of the slab (3) behind the casting machine (2) the slab (3) is subjected to a milling operation in a milling machine (4), wherein at least one surface of the slab (3), preferably two opposing Surfaces, is milled, characterized in that the milling of the slab (3) takes place as the first mechanical working step after the slab (3) has been deflected into the horizontal orientation (H), the slab being cast (3) with a thickness (d) of at least 50 mm, and the casting of the slab (3) is carried out with a mass flow as a product of casting speed and slab thickness (vxd) of at least 280 m / min x mm, the material of

Slab of higher strength material with a carbon content of C> 0.3%, silicon steel or microalloyed steel.

3. The method according to claim 1 or 2, characterized in that the milling of the slab (3) takes place immediately after the deflection of the slab (3) in the horizontal orientation (H).

4. The method according to claim 1 or 2, characterized in that the milling of the slab (3) after the deflection of the slab (3) in the horizontal orientation (H) and passing through a thermal equalization section (5) and / or a furnace ( 13).

5. The method according to any one of claims 1 to 4, characterized in that in front of or behind the milling machine (4) a measurement of at least one surface parameter of the slab (3) takes place and the adjustment of the machining parameters during milling takes place as a function of the at least one measured surface parameter.

6. The method according to claim 5, characterized in that the milling delivery is effected as a function of the at least one measured surface parameter.

7. The method according to claim 5, characterized in that depending on the at least one measured surface parameter, a bending of at least one milling cutter (6) of the milling machine (4) about a perpendicular to its longitudinal axis (7) standing, horizontal axis (M).

8. The method according to any one of claims 5 to 7, characterized in that the slab (3) is cleaned prior to the measurement of the at least one surface parameter.

9. The method according to any one of claims 1 to 8, characterized in that the milling of the slab (3) in the milling machine (4) takes place so that the slab top and the slab bottom are milled in the conveying direction (F) in the same place.

10. The method according to claim 9, characterized in that the division of the Fräsabnahme on the top and bottom of the slab (3) by means of a vertical adjustment of drive rollers (21) and / or guide plates (22) in front of and behind the cutter (6). or the milling machine (4) takes place.

11. The method according to any one of claims 1 to 8, characterized in that the milling of the slab (3) in the milling machine (4) takes place so that the slab top and the slab bottom are milled in the conveying direction (F) at two successive locations.

12. An apparatus for producing a metal strip (1) by continuous casting, with a casting machine (2), in which a slab (3), preferably a

Thin slab, is poured, wherein in the conveying direction (F) of the slab (3) behind the casting machine (2) at least one milling machine (4) is arranged, in which at least one surface of the slab (3), preferably two opposing surfaces are milled can, in particular for carrying out the method according to one of claims 1 to 11, characterized in that in the conveying direction (F) before and / or behind the milling machine (4) means (8) are provided, with which at least one surface parameter of the slab (3) can be measured, wherein adjusting means are provided with which the at least one cutter (6) of the milling machine (4) can be adjusted depending on the measured surface parameter.

13. The apparatus according to claim 12, characterized in that the adjusting means for adjusting the Fräszustellung the cutter (6) are formed.

14. The device according to claim 12, characterized in that the adjusting means for acting on the milling cutter with a bending moment (M) about a horizontal and perpendicular to the milling cutter longitudinal axis (7) standing axis are formed.

15. Device according to one of claims 12 to 14, characterized in that the means (8) for measuring at least one surface parameter include a camera for determining the depth of cracks on the slab surface.

16. Device according to one of claims 12 to 14, characterized in that the means (8) for measuring at least one surface parameter for determining the temperature distribution of the slab (3) are formed over the slab width.

17. Device according to one of claims 12 to 14, characterized in that the means (8) for measuring at least one surface parameter allow the determination of the geometric shape of the slab (3) across its width transversely to the conveying direction (F).

18. Device according to one of claims 12 to 17, characterized in that the means (8) for measuring at least one surface parameter immediately behind the milling machine (4) are arranged.

19. Device according to one of claims 12 to 17, characterized in that the means (8) for measuring at least one surface parameter are arranged behind a in the conveying direction (F) behind the milling machine (4) befindli- finishing line (9).

20. Device according to one of claims 12 to 17, characterized in that the means (8) for measuring at least one surface parameter behind a in the conveying direction (F) behind the milling machine (4) located cooling section (10) are arranged.

21. Device according to one of claims 12 to 20, characterized in that the milling machine (4) is arranged immediately before a forming stage for the slab (3).