Method and installation for inductively heating a flat product

Abstract

A method and a facility for inductively heating a flat product being transported in a feed direction are described. The facility has at least one transverse field inductor arrangement extending transversely to the feed direction over the width of the flat product, said transverse field inductor arrangement having a longitudinal axis extending parallel to the lateral axis of the flat product. The transverse field inductor arrangement is positioned such that the longitudinal axis extends obliquely in a vertical plane relative to the lateral axis of the flat product. In this way the spacing between the flat product and the inductor arrangement can be varied and thereby the temperature distribution over the lateral profile of the flat product, so that the flat product is heated uniformly.

Description

TECHNICAL FIELD

[0001] The invention relates to a method for inductively heating a flat material, preferably a steel strip, which is transported in a feed direction, using at least one transverse field inductor device which extends over the width of the flat material transversely to the feed direction with a longitudinal axis which runs parallel to the lateral axis of the flat material. Furthermore, the invention relates to a facility with which such a method can be carried out.

[0002] Instead of a conventional gas-fired furnace, flat materials such as strips, sheets, slabs are also heated inductively. In this case, an electric current is induced in the flat material, thereby heating the material.

[0003] Induction heating facilities for heating flat materials have longitudinal field inductors for longitudinal field heating or transverse field inductors for transverse field heating.

[0004] In longitudinal field heating, the flat material to be heated is completely surrounded by the inductor coil, so that the main magnetic flux is oriented in the feed direction of the flat material. The induced current closes on the cross section of the workpiece, wherein at suitable frequencies of the inductor current, the temperature distribution occurring is almost uniform over the entire strip width of the flat material.

[0005] In transverse field heating, the inductor coil does not surround the flat material, but is arranged at the upper side and / or the lower side of the flat material to be heated. In this way, the main magnetic flux of the inductor coil is oriented perpendicular to the surface of the flat material. Disadvantageously in the case of transverse field heating facilities, however, the temperature distribution in the flat material is generally not uniform. This requires an adapted configuration of the geometry and an optimization of the operating parameters of the transverse field heating facility for each use case. BACKGROUND

[0006] It is known that the disadvantageous non-uniform temperature distribution is influenced by targeted shaping of the inductor coil. Furthermore, other solutions for flexibly setting the temperature distribution in the flat material are known, for example two inductor coils arranged transversely to the flat material and two inductor coils arranged longitudinally to the flat material. The two coils running in the longitudinal direction of the flat material can be displaced in the transverse direction of the flat material, so that the temperature distribution at the side edges of the flat material can be set (JP 63195397).

[0007] Further solutions are described in DE 39 28 629 A1, EP 0 667 731 B1, DE 42 34 406 A1 and DE 100 13 061 A1.

[0008] DE 103 12 623 A1 is devoted to a transverse field heating installation having the features of the preamble of patent claim 1. Here, the inductor arrangement has at least two inductor layers arranged on top of one another parallel to the plane of the flat product, which can be displaced independently of one another transversely to the feed direction in order to achieve a flexible setting of the temperature profile in the flat product in the transverse direction of the flat product in this way.

[0009] Further solutions are described in EP 0 274 673 B, EP 1 648 628 A1 and EP 1 148 762 B1. In the first-mentioned publication it is described how different energy loading and thus different temperature increases over the width of the flat product can be achieved by adapting the coil shape. The second-mentioned publication discloses the possibility of influencing the temperature transverse profile by laterally setting transverse field induction coils, predominantly in the edge region. The third-mentioned publication describes the possibility of setting the temperature transverse profile by means of a movable core.

[0010] From US 20180092163 A1 a heating device for an aluminum strip is known, which has a plurality of rotating rollers for carrying out magnetothermal induction. The rotating rollers are arranged in the width direction of the flat product. Furthermore, it is known from this article that the rollers are inclined in the vertical plane with respect to the lateral axis of the flat product. Since rotating rollers with electromagnets arranged in the rollers are much more expensive than non-rotating inductors, the present invention is only concerned with non-rotating transverse field inductor arrangements. SUMMARY

[0011] The task on which the present invention is based is to provide a method and an installation with which a particularly uniform temperature profile over the transverse profile of a flat product can be achieved when the flat product is heated inductively.

[0012] According to the invention, this task is solved in the case of a method of the type specified in that each transverse field inductor arrangement comprises at least two non-rotating conductors which extend over the lateral axis of the flat product, which are serially passed through by an alternating current; and the longitudinal axis of the transverse field inductor arrangement is positioned obliquely in the vertical plane with respect to the lateral axis of the flat product.

[0013] According to the solution of the application, the lateral field inductor device is therefore inclined according to the requirements, so that the distance between the lateral field inductor device and the upper or lower side of the flat product is changed over the lateral contour of the flat product, so that the flat product is heated differently strongly over its lateral contour. It can be assumed here that the greater the distance between the flat product and the lateral field inductor device, the less the heating. This is evident especially in the lateral end regions of the flat product, whereby by inclining the inductor device a large distance is provided in one end region and a small distance in the other end region, so that the end regions are heated differently strongly here. If the other end region should be heated more strongly, a smaller distance is produced by the inclination in this region than at the other end region. The two lateral end regions can therefore be heated variably by changing the inclination.

[0014] The lateral field inductor device forms at least one, preferably a plurality of "windings" arranged in series, due to the non-rotating conductors which extend in the width direction of the flat product, so that the magnetic induction and the inductive heating power are much higher than in the case of a single current flowing through a conductor. The arrangement of the conductors in the width direction of the flat product furthermore ensures that wide flat products, for example with a width of between 900 and 2800 mm, can also be heated uniformly by the lateral field inductor device.

[0015] By inclining the lateral field inductor device according to the application, the distance to the flat product is therefore changed, so that the temperature profile of the flat product can be optimized when heating due to the different distances of the inductor device from the flat product. The distance is preferably changed by a control or regulation device.

[0016] The current induced into the material is also dependent on the distance from the coil. In the case of the lateral field induction method described here, this correlation can be reproduced by the following equation:

[0017] P = P0 * e -kx ,

[0018] where P0 is the induced current at the smallest distance from the material, x is the distance and k is a characteristic coefficient of the system geometry.

[0019] In an embodiment of the application, it is preferred here that action is taken such that the temperature of the flat product is measured upstream and / or downstream of the transverse field inductor device in the feed direction and that the tilting of the transverse field inductor device is carried out in accordance therewith. In this case, the temperature profile of the flat product is measured, in particular over the width of the flat product. In the case where, in this case, temperature irregularities in the flat product are measured due to inhomogeneities and other causes, a corresponding equalization or compensation in the heating process can then be carried out by means of the tilting. In this case, for example, the temperature measuring device gives corresponding signals to the control or regulating device, which causes a corresponding movement of the inductor device (tilting of the inductor device).

[0020] Thus, for example, a corresponding temperature and position model is calculated by the control or regulating device, which reproduces the required thermal energy loading over the width of the flat product, and the inductor device is set in accordance with the calculated and required inclination in order to compensate for temperature deviations.

[0021] In particular, it is possible here for the required energy loading of the transverse field inductor device to be determined from the temperature profile or the measured temperature of the flat product, which is then used for calculating the tilting of the transverse field inductor device in the transverse direction of the flat product. In this way, an exact temperature setting can then be carried out by means of the transverse profile of the flat product. In addition to setting the energy loading by means of the alternating current power supply, the tilting angle of the inductor device is thus set.

[0022] According to the application, the upper and / or lower transverse field inductor device can be tilted. Here, the tilting of the one transverse field inductor device or of the plurality of transverse field inductor devices can be carried out hydraulically, pneumatically or electromechanically.

[0023] In an embodiment of the application, the transverse field inductor device is displaced transversely to the feed direction, i.e. the flat product longitudinal axis. This can preferably be carried out in both directions. By means of this, in addition to the tilting, temperature irregularities can also be equalized or temperature deviations can be compensated for, so that ultimately a uniform temperature profile of the flat product is obtained at the end of the heating process. In this case, the transverse field inductor device is displaced transversely to the feed direction or the flat product longitudinal axis in accordance with the temperature measurement of the flat product upstream of the transverse field inductor device in the feed direction.

[0024] It is furthermore possible for one transverse field inductor device to be displaced relative to another transverse field inductor device transversely to the feed direction. By means of this, the temperature profile can be variably set on the upper side and the lower side of the flat product.

[0025] Here, according to the application, the tilting and transverse positioning of the transverse field inductor device is carried out by the control / regulating device, in particular in dependence on the temperature measurement of the flat product. In other words, in this case, the transverse field inductor device is displaced in the transverse direction relative to the flat product and tilted relative to the lateral axis of the flat product in order to achieve the desired temperature setting.

[0026] In particular, in the middle position, a plurality of temperature measurements can be carried out on the flat product in order to be able to react flexibly to temperature deviations. Here, according to the application, it is possible to adapt to the respective situation in order to achieve a particularly high accuracy in terms of temperature setting.

[0027] In an advantageous embodiment of the application, in which the flat product is hot-rolled after inductive heating and the flatness and / or profile of the hot-rolled flat product is measured, the tilting and / or transverse positioning of the one or more transverse field inductor devices is carried out in dependence on the measured flatness and / or profile.

[0028] This embodiment is based on the recognition that a temperature distribution of the flat product which is not uniform in the width direction has a disadvantageous effect on the flatness and / or profile of the hot-rolled flat product during and after hot-rolling. It is therefore provided that the tilting and / or transverse positioning of the one or more transverse field inductor devices is changed on the basis of the flatness and / or profile of the hot-rolled flat product. The geometry of the hot-rolled flat product is thereby improved.

[0029] The application furthermore relates to a facility for inductively heating a flat product which can be transported in a feed direction, the facility having at least one transverse field inductor device which extends over the width of the flat product transversely to the feed direction, the transverse field inductor device having a longitudinal axis which runs parallel to the lateral axis of the flat product.

[0030] The facility constructed according to the application is characterized in that each transverse field inductor device comprises at least two non-rotating conductors which run over the lateral axis of the flat product, the conductors being serially passed through by an alternating current, and

[0031] - the facility has at least one, preferably two, particularly preferably four positioning devices for the transverse field inductor device, so that the longitudinal axis of the transverse field inductor device can be positioned obliquely relative to the lateral axis of the flat product in the vertical plane.

[0032] Here, the transverse field inductor device is preferably arranged in a frame or support of the facility (Anlage) so that the transverse field inductor device can be raised or lowered at one or the other lateral end in order to achieve the desired tilting. Here in particular, the positioning device preferably has a positioning device for raising or lowering the respective lateral end of the transverse field inductor device in each lateral end region of the transverse field inductor device.

[0033] In an improvement, the facility furthermore comprises temperature measuring devices for the flat material upstream and / or downstream of the transverse field inductor device. Furthermore, control or regulation devices are provided here, which are used to operate the positioning devices for raising or lowering the inductor device depending on the temperature measuring devices. Here, the temperature measuring devices measure the temperature profile in the transverse direction of the flat material, in particular.

[0034] Here, the facility constructed according to the application preferably functions in such a way that the control or regulation devices provided depending on the measured temperature determine the power loading of the transverse field inductor device and accordingly operate the alternating current power supply for the power delivery. Furthermore, the positioning devices for the beveling of the inductor device are operated accordingly, so that an optimum temperature distribution can be achieved by varying the power delivery and the spacing on the transverse profile of the flat material.

[0035] Preferably, the facility comprises an upper and a lower transverse field inductor device, one or both of which can be operated.

[0036] As mentioned, positioning devices are provided for beveling the inductor device, which are constructed as hydraulic, pneumatic and / or electromechanical actuating elements, respectively.

[0037] In an improvement, the facility according to the application has devices for transversely displacing the inductor device. In this case, the inductor device is moved in the transverse direction relative to the flat material, so that in addition to the beveling of the inductor device, further variants for heating the transverse profile of the flat material are given thereby. In this case, for example, the carrier of the inductor device of the facility is displaced transversely relative to the flat material as a whole. The effect consisting of beveling and transverse position is superimposed thereby in order to achieve the desired temperature distribution.

[0038] It is particularly advantageous if in the case of a facility with an upper transverse field inductor device and a lower transverse field inductor device there is one or more drive devices for transversely displacing the transverse field inductor devices relative to one another.

[0039] The temperature measuring devices provided according to the application can have a plurality of sensors in order to be able to carry out particularly precise temperature measurements, so that the precision of the heating of the flat material on the transverse profile of the flat material can thereby be increased.

[0040] In an advantageous embodiment, at least one hot rolling stand for hot rolling the flat material and a measuring device for flatness and / or profile measurement of the hot rolled flat material are arranged downstream of the facility for inductive heating in the feed direction, wherein the control or regulation devices can carry out the beveling and / or the transverse positioning of the transverse field inductor device depending on the flatness and / or profile.

[0041] According to the present application, an improvement of the accuracy and uniformity of the temperature transverse profile of the flat is thus achieved. Furthermore, a uniform surface of the flat as well as uniform material properties over the width of the flat are achieved. The end product has a high flat profile accuracy. Furthermore, an improvement of the uniformity of the wear of the work rolls is achieved and thus an extended service life of the facility is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0042] The above-mentioned characteristics, features and advantages of the present application as well as the way how they are achieved will become more clearly and better understood from the following description of embodiments in connection with the drawings. Herein:

[0043] Figure 1 A diagram showing the induced current density as a function of the distance between the transverse field inductor arrangement and the flat material;

[0044] Figure 2 A schematic cross-section showing a first embodiment of a facility for inductively heating a flat;

[0045] Figure 3 A schematic cross-section showing a second embodiment of a facility for inductively heating a flat;

[0046] Figure 4 A schematic cross-section showing a third embodiment of a facility for inductively heating a flat;

[0047] Figure 5 A top view showing a facility for inductively heating a flat in a hot rolling mill; and

[0048] Figure 6 A schematic diagram showing a facility for inductively heating a flat in a hot rolling mill. DETAILED DESCRIPTION

[0049] Figure 1 A diagram showing the induced current density as a function of the distance between the coil of the transverse field inductor arrangement and the flat. In this case, the normalized current density is illustrated on the ordinate, while the normalized distance is shown on the abscissa. It can be clearly seen that the current density decreases with increasing distance.

[0050] In Figure 2The facility for inductively heating a flat material which can be transported in a feed direction is shown in the drawing schematically and has an upper transverse field inductor arrangement 2 and a lower transverse field inductor arrangement 3, which are shown here only schematically as strips, respectively. Both arrangements 2, 3 have induction coils which are fed with alternating current by means of cables 9, 10 in order to generate corresponding eddy currents which cause heating of the flat material 1 which is arranged between the two transverse field inductor arrangements 2, 3. The flat material 1 is in this case a steel strip which is to be heated and which passes through the facility in a direction perpendicular to the drawing plane.

[0051] Both transverse field inductor arrangements 2, 3 are in this case configured wider than the flat material 1 and are arranged in a height-adjustable manner at a frame 5 of the facility via two positioning devices 4 which are configured as hydraulic cylinders or electric linear drives, respectively. The facility can be moved in the transverse direction, i.e. perpendicular to the longitudinal axis of the flat material 1, on a base 8 equipped with guide rails by means of a pulley 6. The corresponding drive is shown at 7.

[0052] The facility is equipped with positioning devices for both transverse field inductor arrangements 2, 3, which comprise the positioning devices 4 shown. Each inductor arrangement 2, 3 is thus equipped with two positioning devices 4 which cause the inductor arrangement 2, 3 to be raised or lowered in its transverse end region. In the embodiment shown in Figure 1 In the embodiment shown in the drawing, the lower inductor arrangement 3 extends parallel to the flat material 1 and spaced apart therefrom, while the upper inductor arrangement 2 is arranged obliquely with respect thereto. The oblique positioning of the inductor arrangement 2 is achieved by means of the positioning devices 4 shown on the left in Figure 1 In the embodiment shown in the drawing, the lower inductor arrangement 3 extends parallel to the flat material 1 and spaced apart therefrom, while the upper inductor arrangement 2 is arranged obliquely with respect thereto. The oblique positioning of the inductor arrangement 2 is achieved by means of the positioning devices 4 shown on the left in

[0053] This oblique positioning or raising of the inductor arrangement 2 has the purpose of increasing the spacing of the inductor arrangement 2 from the flat material 1 and thereby changing the heating of the inductor arrangement in this region compared to the heating in the other transverse end region. Due to the greater spacing, the flat material is thus less heated in this end region than in the opposite end region, so that, for example, a levelling of the temperature profile in the transverse direction of the flat material 1 can thereby be achieved.

[0054] Specifically, this facility functions by arranging a measuring device (not shown here) before passing through it, which measures the temperature profile in the lateral direction of the flat member 1. The corresponding signal from the measuring device is transmitted to a control device (not shown), which determines the temperature and position model and, on the one hand, controls the AC power supply for the two sensor devices 2 and 3, and on the other hand, controls the two positioning devices 4 of the upper inductor device 2. The two sensor devices 2 and 3 and the positioning devices 4 are thus controlled to produce a uniform temperature distribution along the lateral profile of the flat member 1.

[0055] Figure 3 One embodiment of the facility is shown, in which, in addition to tilting the sensor devices 2 and 3, the facility can be laterally displaced relative to the flat member 1. In this figure, the two rightward displacement positions of the sensor devices 2 and 3 are shown with dotted lines. For this purpose, the housing of the facility is displaced to the right in the figure by pulleys 6 arranged on the lower side of the respective frame 5, with the displaced positions shown with dashed lines. Therefore, after the displacement, the flat member 1 is no longer centered relative to the two sensor devices 2 and 3, but is displaced to the left relative to the two sensor devices.

[0056] Furthermore, the facility is equipped with a device for tilting the two sensor devices 2 and 3. In this case, not only the upper sensor device 2 but also the lower sensor device 3 has been slightly moved upward and downward by the positioning device 4 shown on the left side of the figure, resulting in the corresponding tilt. Therefore, in the left lateral end region of the flat member 1, the distance from the respective sensor devices 2 and 3 is greater than in the right lateral end region of the flat member.

[0057] Even in this embodiment, a measuring device (not shown) is installed before passing through the facility. This measuring device measures the lateral temperature profile of the flat member 1 and sends a corresponding signal to the corresponding control device (also not shown). This control device then operates not only the AC power supply for the energy loading of the two sensor devices 2 and 3, but also the positioning device for tilting the sensor devices 2 and 3, and the device for laterally shifting the sensor devices. The position and temperature model generated by the control device is thus achieved by operating the above three devices, resulting in a substantially uniform lateral temperature profile for the flat member 1 at the facility's exit.

[0058] exist Figure 4 The diagram shows a device for inductively heating the flat component 1. (Compared to...) Figure 4In contrast, the upper and lower transverse field inductor arrangements 2, 3 can be moved independently of one another in the width direction of the flat by means of the drive device 7. Thereby, the temperature profile can be set independently of the upper and lower side of the flat 1. It is furthermore possible to displace the entire frame 5 by means of a further drive device 7. This can be advantageous in order to be able to remove the induction modules quickly from the flat 1 in the event of a cobble. The upper and lower transverse field inductor arrangements 2, 3 can thus be inclined individually not only with respect to the lateral axis of the flat 1, but also be displaced individually in the width direction, as shown. It is of course possible to provide only a lateral displacement of the transverse field inductor arrangements. A relative displacement of the transverse field inductor arrangements can also be achieved even in this case.

[0059] Figure 5 A top view of a facility for inductive heating is shown schematically, which has a single induction module with upper and lower transverse field inductor arrangements 2, 3, wherein only the upper transverse field inductor arrangement 2 is visible. Each inductor arrangement 2, 3 has eight conductors 30, which are oriented in the lateral direction Q of the flat 1 and for example form four turns. It is of course possible to provide more than four turns, for example 20 turns. The inductor arrangements 2, 3 can be inclined obliquely with respect to the lateral axis of the flat by means of two positioning devices 4 each. The inclination is effected by means of a control or regulation device 23, which calculates the inclination from the temperature profile of the flat 1 (see temperature measuring devices 22 upstream or downstream of the induction module), the profile and / or flatness 41 of the hot-rolled flat and / or the target value of the profile and / or flatness and the actual value of the profile and / or flatness (see measuring devices 40). The control or regulation device 23 is connected to the positioning devices 4 for the inclination, to the drive device 7 for the lateral displacement of the frame 5 and to the AC power supply 24. The current strength and optionally also the frequency of the AC current flowing through the conductors 30 can be set via the AC power supply 24. After the flat has been heated, it is descaled by means of a descaling device 21 and subsequently hot-rolled in succession by means of a plurality of hot-rolling stands 20.

[0060] Finally, Figure 6 A front view of a facility for inductive heating is shown schematically, which has five induction modules 2, 3, temperature measuring devices 22 for measuring the temperature profile, a descaling device 21, three hot-rolling stands 20 and a measuring device 40 for the profile and / or flatness. In this case, the control or regulation device 23 sets the inclination and, if necessary, also the lateral displacement of the transverse field inductor arrangements 2, 3, from the measured profile and / or flatness and the temperature profile. The hot-rolling stands 20 can be an intermediate or finishing mill train in a cast-rolling complex, wherein the hot-rolled finished strip is produced from a liquid steel melt, preferably in continuous operation.

[0061] Although the application has been illustrated and described in more detail by preferred embodiments, the application is not restricted to the disclosed examples but can be varied in many ways by a person skilled in the art without departing from the scope of the application.

[0062] List of reference signs

[0063] 1 profile

[0064] 2 upper transverse field inductor arrangement

[0065] 3 lower transverse field inductor arrangement

[0066] 4 positioning device

[0067] 5 frame

[0068] 6 pulley

[0069] 7 drive arrangement

[0070] 8 base

[0071] 9, 10 cable

[0072] 20 hot rolling stand

[0073] 21 phosphorus removal arrangement

[0074] 22 temperature measuring arrangement

[0075] 23 control or regulating arrangement

[0076] 24 alternating current source

[0077] 30 conductor

[0078] 40 measuring device for profile and flatness

[0079] 41 target value for profile and flatness

[0080] L longitudinal axis of the transverse field inductor arrangement

[0081] Q transverse axis of the profile

[0082] V feed direction of the profile

Claims

1. A method for inductively heating a flat piece (1) conveyed along the feed direction (V) using at least one transverse field sensor device (2, 3) extending transversely to the width of the flat piece (1) in the feed direction (V), said transverse field sensor device having a longitudinal axis extending parallel to the transverse axis (Q) of said flat piece (1), characterized in that, - Each transverse field sensor device (2, 3) includes at least two non-rotating conductors (30) extending along the transverse axis (Q) of the flat member (1), the conductors being passed in series by alternating current; and - The longitudinal axis (L) of the transverse field sensor device (2, 3) is variably positioned in the vertical plane with respect to the transverse axis (Q) of the flat member (1). The distance between the lateral field sensor device and the upper or lower side of the flat component is changed by tilting the lateral field sensor device on the lateral contour of the flat component, so that the flat component is heated at different intensities on its lateral contour.

2. The method according to claim 1, characterized in that, The flat piece (1) being transported along the feed direction (V) is heated in an inductive manner by means of transverse field sensor devices (2, 3) extending transversely to the width of the flat piece (1) in the feed direction (V).

3. The method according to claim 1, characterized in that, The temperature of the flat piece (1) is measured upstream and / or downstream of the transverse field sensor device (2, 3) in the feed direction (V), and the transverse field sensor device (2, 3) is tilted accordingly.

4. The method according to claim 3, characterized in that, The temperature profile is measured across the width of the flat piece (1).

5. The method according to claim 3 or 4, characterized in that, The power load of the transverse field sensor devices (2, 3) is determined based on the measured temperature or the measured temperature profile and is set by an AC power supply (24).

6. The method according to any one of claims 1 to 4, characterized in that, The lateral field sensor devices (2, 3) are tilted by hydraulic, pneumatic or electromechanical means.

7. The method according to any one of claims 1 to 4, characterized in that, At least one transverse field sensor device (2, 3) is displaced transversely to the feed direction (V).

8. The method according to claim 7, characterized in that, One transverse field sensor device (2, 3) is displaced transversely to the feed direction (V) relative to another transverse field sensor device (2, 3).

9. The method according to claim 7, characterized in that, The transverse field sensor devices (2, 3) are shifted transversely to the feed direction (V) based on temperature measurements of the flat member (1) upstream and / or downstream of the transverse field sensor devices (2, 3).

10. The method according to claim 3, characterized in that, Based on the temperature measurement of the flat member (1) upstream and / or downstream of the transverse field sensor device (2, 3) in the feed direction (V), the transverse field sensor device (2, 3) is tilted and laterally positioned.

11. The method according to claim 5, characterized in that, Based on the temperature measurement of the flat member (1) upstream and / or downstream of the transverse field sensor device (2, 3) in the feed direction (V), the transverse field sensor device (2, 3) is tilted and laterally positioned.

12. The method according to claim 9, characterized in that, Based on the temperature measurement of the flat member (1) upstream and / or downstream of the transverse field sensor device (2, 3) in the feed direction (V), the transverse field sensor device (2, 3) is tilted and laterally positioned.

13. The method according to any one of claims 1 to 4, wherein the flat piece (1) is hot-rolled after induction heating, and the flatness and / or profile of the hot-rolled flat piece are measured, characterized in that, Based on the measured flatness and / or contour, the lateral field sensor devices (2, 3) are tilted and / or laterally positioned.

14. A device for inductively heating a flat piece (1) that can be transported in a feed direction (V), said device having at least one transverse field sensor device (2, 3) extending transversely to the feed direction (V) over the width of the flat piece (1), said transverse field sensor device having a longitudinal axis (L) extending parallel to the transverse axis of the flat piece (1), characterized in that, - Each transverse field sensor device (2, 3) includes at least two non-rotating conductors (30) extending along the transverse axis (Q) of the flat member (1), the conductors being sequentially energized by alternating current; and - The facility has at least one positioning device (4) for the transverse field sensor devices (2, 3) such that the longitudinal axis (L) of the transverse field sensor devices (2, 3) can be positioned obliquely relative to the transverse axis (Q) of the flat member (1) in the vertical plane (VE).

15. The facility according to claim 14, characterized in that, The facility is used to implement the method according to any one of claims 1 to 13.

16. The facility according to claim 14, characterized in that, The facility has transverse field sensor devices (2, 3) extending upward and downward transversely to the feed direction (V) over the width of the flat member (1).

17. The facility according to claim 14, characterized in that, The facility has two positioning devices (4) for the lateral field sensor devices (2, 3).

18. The facility according to claim 14, characterized in that, The facility has four positioning devices (4) for the lateral field sensor devices (2, 3).

19. The facility according to claim 14, characterized in that, The positioning device (4) includes a positioning device (4) for raising or lowering the respective lateral end region of the lateral field sensor device (2, 3) in each lateral end region of the lateral field sensor device (2, 3).

20. The facility according to any one of claims 14 to 19, characterized in that, The facility includes a temperature measuring device (22) for the flat member (1) upstream and / or downstream of the transverse field sensor devices (2, 3).

21. The facility according to claim 20, characterized in that, The facility includes a control or adjustment device (23) configured to manipulate the positioning device (4) to raise or lower the transverse field sensor device (2, 3) according to the temperature measuring device (22).

22. The facility according to claim 20, characterized in that, The temperature measuring device (22) measures the temperature profile of the flat piece (1) in the lateral direction.

23. The facility according to claim 21, characterized in that, The control or regulation device (23) determines the power load of the transverse field sensor device (2, 3) based on the measured temperature and accordingly manipulates the AC power supply (24) for power transmission.

24. The facility according to any one of claims 14 to 19, characterized in that, The positioning device (4) is configured as a hydraulic, pneumatic and / or electromechanical actuator.

25. The facility according to any one of claims 14 to 19, characterized in that, The facility has a drive device (7) for laterally shifting the lateral field sensor devices (2, 3).

26. The facility according to claim 25, wherein the facility has upper and lower lateral field sensor devices (2, 3), characterized in that, There are one or more drive devices (7) for laterally displacing the lateral field sensor devices (2, 3) relative to each other.

27. The facility according to claim 21, characterized in that, The control or adjustment device (23) not only controls the positioning device (4) for tilting but also controls the drive device (7) for lateral displacement.

28. The facility according to claim 21, characterized in that, At least one hot rolling mill stand for hot rolling the flat piece (1) and a measuring device for measuring the flatness and / or profile of the hot-rolled flat piece are arranged after the facility for induction heating in the feed direction (V), characterized in that the control or adjustment device (23) is capable of implementing the oblique placement and / or lateral positioning of the transverse field sensor device (2, 3) according to the flatness and / or profile.

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