Device for thermally treating a metal workpiece, production line, and method

Abstract

The invention relates to a device (1) for thermally treating a metal workpiece (2) conveyed in a conveying direction (R1), comprising a first temperature-changing module (10) and a second temperature-changing module (20), wherein the first temperature-changing module (10) has a greater nominal power density than the second temperature-changing module (20); and wherein the second temperature-changing module (20) is designed to change a temperature of a temperature-changing region associated with the second temperature-changing module (20) at a temperature-changing rate of less than or equal to 10 K / min. The invention also relates to a production line (100) and to a method.

Description

[0001] Applicant: SMS group GmbH

[0002] Our reference number: P81080WO

[0003] December 2, 2025

[0004] Device for the thermal treatment of a metallic workpiece, production line and process

[0005] The invention relates to a device for the thermal treatment of a metallic workpiece conveyed in a conveying direction, a production line for the manufacture and / or processing of a metallic workpiece and a method for the thermal treatment of a metallic workpiece.

[0006] Furthermore, the invention relates to the use of such a device for the thermal treatment of a metallic workpiece and the use of such a production line for the manufacture and / or processing of a metallic workpiece.

[0007] Before forming, especially rolling, a metallic workpiece, particularly a slab, the temperature of the workpiece must be adjusted to the process requirements of the forming operation to achieve the desired surface qualities as well as mechanical, physical, and / or electromagnetic properties. This requires the ability to precisely control the temperature of the workpiece over time before forming. In the prior art, this requires large amounts of energy and often results in significant carbon emissions.

[0008] The invention is based on the objective of providing a device for the thermal treatment of a metallic workpiece, by means of which the temperature of the metallic workpiece can be precisely set and at the same time the energy used can be reduced.

[0009] This problem underlying the invention is solved by a device having the features of claim 1. Advantageous embodiments are described in the dependent claims.

[0010] More precisely, the problem underlying the invention is solved by a device for the thermal treatment of a metallic workpiece conveyed in a conveying direction, comprising a first temperature change module and a second temperature change module, wherein the first temperature change module has a higher nominal power density than the second temperature change module; and wherein the second temperature change module is configured to change the temperature of a temperature change range associated with the second temperature change module at a temperature change rate of less than or equal to 20 K / min.

[0011] When the intended use of the device is mentioned below, this refers to the use of the device in a production line for the manufacture and / or processing of metallic workpieces.

[0012] A device designed in this way has the advantage that, when used as intended, the temperature of the metallic workpiece can be precisely set to the temperature required for forming the workpiece before forming it, while simultaneously increasing the energy efficiency of the device. A first temperature change module with a high power density allows a large amount of energy to be introduced into the metallic workpiece within a short time and over a short conveying distance, thus increasing its temperature.By combining such a temperature change module with a second temperature change module incorporating thermal inertia, a rapid temperature change of the metallic workpiece by the first temperature change module can be combined with a thermal buffer effect by the second temperature change module, thus enabling improved and more precise temperature control of the metallic workpiece. In particular, when the device is used as intended, a forming process of the metallic workpiece can be completely decoupled from a primary forming process.

[0013] A power density is preferably an area power density with the unit W / m². 2, where the power density denotes the distribution of the power of a temperature-change module over a surface of the metallic workpiece, in particular the surface of the top of the metallic workpiece and the surface of the bottom of the metallic workpiece. In other words, the power density of a temperature-change module denotes the power per m² delivered by the temperature-change module into the metallic workpiece. 2 the surface of the metallic workpiece. The power density of a temperature change module referred to here can therefore also be described as the power density in the metallic workpiece.

[0014] The nominal power density of a temperature change module is preferably the maximum power density achievable during operation of the temperature change device. A temperature change module with a nominal power density of greater than or equal to 5–10 5 w / m 2 is therefore designed to provide a power output of greater than or equal to 5-10 5 to be able to dissipate W per square meter of the surface of the metallic workpiece. In some cases, where the edges of the metallic workpiece are specifically heated separately, the surface of the metallic workpiece relevant for determining the power density can also extend to the side surface of the metallic workpiece heated by an edge heater, extending beyond the top and bottom surfaces.

[0015] The first temperature change module can achieve a nominal power density of > 5-10 4W / m 2 , > 9-10 4 W / m 2 , > 1-10 5 W / m 2 , > 2-10 5 W / m 2 , > 3,5-10 5 W / m 2 , > 5-10 5 W / m 2 , > 7-10 5 W / m 2 , > 8,5-10 5 W / m 2 , > 1-10 6 W / m 2 oder > 2 -IO 6 W / m 2 aufweisen.

[0016] Within a temperature change zone of a temperature change module, power is preferably delivered by the temperature change module to the metallic workpiece, preferably to a surface of the metallic workpiece, to change its temperature. Preferably, the metallic workpiece is located at least partially within a temperature change zone of a temperature change module while the temperature change module is changing the temperature of the metallic workpiece. A temperature change zone preferably has a volume that is at least partially, and preferably completely, confined to the surroundings. For example, a temperature change zone of a temperature change module is a furnace volume or a portion thereof. The temperature change zone can, for example, have a volume of less than or equal to 600 m³. 3include, preferably of less than or equal to 500 m 3 , preferably of less than or equal to 250 m 3 and especially preferred if less than or equal to 100 m 3 The temperature change range can cover a volume greater than or equal to 60 m³. 3 include, preferably of greater than or equal to 125 m 3 , preferably of greater than or equal to 300 m 3 and especially preferably of 450 m or greater 3 The temperature of the temperature change range can be variable. For example, the temperature of the temperature change range can be changed to a previously determined nominal temperature. The nominal temperature can be the temperature of the temperature change range of the associated temperature change module required in an operation of the device for changing the temperature of the metallic workpiece.

[0017] The temperature change rate of a temperature change module is preferably the maximum possible rate at which the temperature change module can change the temperature of the temperature change range associated with the temperature change module from a first temperature to a second temperature, for example, the nominal temperature. For example, a temperature change module with a temperature change rate of 2 K / min can change the temperature of the associated temperature change range by 2 K in one minute, preferably increasing or decreasing it.

[0018] The second temperature change module is preferably configured to change the temperature of the temperature change range associated with the second temperature change module at a temperature change rate of less than or equal to 15 K / min, preferably less than or equal to 10 K / min, more preferably less than or equal to 8 K / min, and particularly preferably less than or equal to 2.5 K / min. The second temperature change module is further preferably configured to change the temperature of the temperature change range associated with the second temperature change module at a temperature change rate of less than or equal to 1.8 K / min, more preferably less than or equal to 1 K / min, more preferably less than or equal to 0.8 K / min, and particularly preferably less than or equal to 0.5 K / min.The rate of temperature change of a temperature change module can vary, for example depending on the first and second temperatures of the temperature change range. For example, the rate of temperature change in the range from a first temperature of 50 °C to a second temperature of 500 °C may be greater than in the range from a first temperature greater than 500 °C to a second temperature of 1000 °C.

[0019] Preferably, a temperature change module has a temperature change rate from a first temperature of 0 °C to a second temperature of less than or equal to 500 °C of less than or equal to 20 K / min, preferably less than or equal to 15 K / min, more preferably less than or equal to 10 K / min, and particularly preferably less than or equal to 8 K / min.

[0020] Preferably, a temperature change module has a temperature change rate from a first temperature of greater than or equal to 500 °C to a second temperature of less than or equal to 1000 °C of less than or equal to 10 K / min, preferably less than or equal to 8 K / min, more preferably less than or equal to 6 K / min, and particularly preferably less than or equal to 4 K / min.

[0021] Preferably, a temperature change module has a temperature change rate from a first temperature of greater than or equal to 950 °C to a second temperature of less than or equal to 1250 °C of less than or equal to 8 K / min, preferably less than or equal to 6 K / min, more preferably less than or equal to 5 K / min, and particularly preferably less than or equal to 3 K / min.

[0022] The second temperature change module can achieve a nominal power density of > 5 - 10 4 w / m 2 , > 9 - 10 4 w / m 2 , > 1 - 105 w / m 2 , > 2 - 10 5 w / m 2 , > 3 , 5 - 10 5 w / m 2 , > 5 - 10 5 w / m 2 , > 7 - 10 5 w / m 2 , > 8 , 5 - 10 5 w / m 2 , > 1 - 10 6 w / m 2 or > 2 - IO 6 w / m 2 exhibiting this feature. This allows the temperature of the metallic workpiece to be changed even faster, so that with such a device the temperature of a metallic workpiece can be set even more precisely before forming.

[0023] The second temperature change module can be configured to reduce the temperature difference between the surface temperature and core temperature of the metallic workpiece to < 50 °C, preferably to < 30 °C, more preferably to < 20 °C, and most preferably to < 10 °C. Such a reduction of the temperature difference can also be referred to as homogenizing the temperature of the metallic workpiece. This allows for a more uniform metallic microstructure, particularly a fine-grained microstructure, to be achieved more effectively through subsequent forming processes.

[0024] The second temperature change module can include one or more passive temperature change devices and / or one or more active temperature change devices. The first temperature change module can include one or more passive temperature change devices and / or one or more active temperature change devices.

[0025] The passive temperature modification device can be designed as an insulating heat-holding device, in particular a furnace housing or an insulating hood. Unlike a furnace housing, an insulating hood can be removed from one conveying direction. A passive temperature modification device allows the thermal energy with which the metallic workpiece enters the first and / or second temperature modification module to be used more effectively to delay the cooling of the metallic workpiece. This enables an energetically advantageous buffering effect of the metallic workpiece. The active temperature modification device can also be referred to as a heating element. For example, the active temperature modification device can be designed as a DFI module, a flameless porous burner, a gas burner, a radiant heater (preferably an electrically operated radiant heater), or an induction heating device.

[0026] A radiant heater can be operated using electrical energy. Such a heater typically generates heat radiation by heating a resistor through an electric current. This type of electric heater can also be called a resistance heater. A radiant heater is preferably designed to emit heat radiation to a metallic workpiece. An electrically operated radiant heater can have a nominal power density of 2–10 4 w / m 2 reach, preferably from 3 - 10 4 w / m 2 , preferably from l , 5 - 10 5 w / m 2 .

[0027] A gas burner can be expediently designed in combination with at least one corresponding jet tube as a heating element. The nominal power density of a gas burner can be 2.5–10 4 w / m 2 reach, preferably 5-10 4 w / m 2 , preferably 1-10 5 w / m 2and especially preferred 1 - 10 6 w / m 2 .

[0028] An induction heating device is designed to increase the temperature of a metallic workpiece using a magnetic field. An induction heating device comprises at least one coil which, in operative connection with at least one capacitor, forms a resonant circuit. This resonant circuit can be supplied with electrical energy by a power supply unit. The power supply unit may include an inverter, which is preferably connected, or can be connected, to a DC link. An induction heating device can have a nominal power density of greater than or equal to 1–10 6 w / m 2 exhibit, preferably greater than or equal to 2 - IO 6 w / m 2 , preferably of greater than or equal to 4 - IO 6 w / m 2and especially preferred from 8 or greater - 10 6 w / m 2 According to a preferred embodiment, an induction heating device can have a nominal power density of greater than or equal to 4 Ω. 6 w / m 2 and less than or equal to 8 - 10 6 w / m 2 exhibiting . According to a preferred embodiment, an induction heating device can have a nominal power density of greater than or equal to 2 - IO 7 w / m 2 exhibit .

[0029] The use of an induction heating device as the heating medium offers the advantage that the nominal power density is independent of the ambient temperature of the metallic workpiece. This is particularly advantageous when heating the metallic workpiece at high outlet temperatures. Furthermore, the use of an induction heating device allows for the heating of metallic workpieces with lower carbon emissions. These carbon emissions can include carbon dioxide, carbon monoxide, and / or other carbon-oxygen compounds.

[0030] The induction heating device can have two coils. Preferably, the two coils are arranged opposite each other with respect to a conveying plane of the metallic workpiece.

[0031] The conveying plane of the metallic workpiece is preferably the plane in which the metallic workpiece is conveyed in the conveying direction. The conveying plane is preferably defined by the conveying direction and a transverse direction, preferably a direction in the direction of the width of the metallic workpiece. The induction heating device can be configured to generate a longitudinal magnetic field and / or a transverse magnetic field.

[0032] A DFI module is preferably a heating device configured to apply a Direct Flame Impingement (DFI) process for heating the metallic workpiece. The DFI process is also known as an oxyfuel process. In the DFI process, at least one oxyacetylene flame or one oxygen flame heats the metallic workpiece directly, in particular by direct contact with the workpiece, preferably with a surface of the workpiece. The nominal power density achievable with the DFI process can be up to ten times higher than with conventional fuel-heated furnaces. A nominal power density of a DFI module can be 1–10 5 w / m 2 reach, preferably 2 - 10 5 w / m 2 , preferably 5-10 5 w / m 2 and especially preferred 1 - 10 6 w / m 2 .

[0033] The first temperature change module and / or the second temperature change module may have a plurality of DFI modules, in particular two DFI modules, three DFI modules, four DFI modules, five DFI modules or more than five DFI modules.

[0034] This plurality of DFI modules can be arranged in a common housing, for example, a furnace housing. Alternatively, the plurality of DFI modules can have separate housings, in particular furnace housings, which are arranged successively along the conveying direction of the metallic workpiece.

[0035] A flameless porous burner is preferably a heating device designed to heat a metallic workpiece by thermal radiation and / or convection. In a flameless porous burner, combustion takes place in an open flame within a porous, high-temperature ceramic. The high-temperature ceramic, glowing from the combustion, radiates heat towards the metallic workpiece and can simultaneously serve as a hot air source, allowing additional heat to be transferred by convection. The nominal power density of a flameless porous burner can range from 1 to 10 6 w / m 2 to reach .

[0036] The first temperature change module and / or a heating element of the first temperature change module can be movably mounted transversely to the conveying direction of the metallic workpiece. For example, the first temperature change module and / or a heating element of the first temperature change module can be displaceable transversely to the conveying direction of the metallic workpiece. According to a preferred embodiment, the first temperature change module and / or a heating element of the first temperature change module can be movably mounted transversely to the conveying direction of the metallic workpiece by means of rails and are preferably displaceable transversely along the rails to the conveying direction. This allows the metallic workpiece to be heated more precisely by adding or removing the first temperature change module and / or a heating element of the first temperature change module.

[0037] A metallic workpiece can be a semi-finished product which contains at least one metal or which has a metal content of greater than or equal to 90 wt.%, preferably a metal content of greater than or equal to 95 wt.%, more preferably a metal content of greater than or equal to 96 wt.% and particularly preferably a metal content of greater than or equal to 98 wt.%.

[0038] The metallic workpiece has a thickness, a width, and a length, and may alternatively have an infinite length. The metallic workpiece further comprises a surface and a core, and the temperature of the surface of the metallic workpiece may differ from the temperature in the core. Accordingly, the surface temperature of the metallic workpiece may differ from the core temperature, particularly due to heat flow from the surroundings of the metallic workpiece into the metallic workpiece and / or heat flow from the metallic workpiece to its surroundings.

[0039] A metallic workpiece can be a billet, where a billet has a thickness that is essentially equal to its width. In other words, a billet has a substantially square cross-sectional area.

[0040] A metallic workpiece can be a pre-block. Preferably, the width of a pre-block is less than or equal to 1.4 times the thickness of the pre-block, more preferably less than or equal to 1.3 times the thickness of the pre-block, and particularly preferably less than or equal to 1.2 times the thickness of the pre-block.

[0041] The metallic workpiece can be a slab. Preferably, the width of a slab is less than or equal to 35 times its thickness, more preferably less than or equal to 30 times its thickness, and particularly preferably less than or equal to 20 times its thickness. Furthermore, preferably the width of a slab is greater than or equal to 1.5 times its thickness, more preferably greater than or equal to 1.6 times its thickness, and particularly preferably greater than or equal to 2 times its thickness.

[0042] A slab is also referred to as a thick slab if it has a thickness of 150 mm or more, preferably 180 mm or more, and particularly preferably 220 mm or more. A slab is also referred to as a thin slab if it has a thickness of 150 mm or less, preferably 135 mm or less, and particularly preferably 120 mm or less.

[0043] Preferably, a slab has a length greater than or equal to 1.2 m, more preferably greater than or equal to 1.5 m, further preferably greater than or equal to 1.8 m and particularly preferably greater than or equal to 2 m. Furthermore, preferably, a slab has a length greater than or equal to 4 m, more preferably greater than or equal to 5 m, further preferably greater than or equal to 10 m and particularly preferably greater than or equal to 12 m.

[0044] The metallic workpiece can be a sheet metal part. Preferably, a sheet metal part has a thickness of less than or equal to 200 mm, more preferably a thickness of less than or equal to 150 mm, and particularly preferably a thickness of less than or equal to 100 mm. Furthermore, preferably the width of a sheet metal part is greater than or equal to 10 times its thickness, more preferably greater than or equal to 20 times its thickness, and particularly preferably greater than or equal to 30 times its thickness.

[0045] The metallic workpiece is preferably conveyed along its length in the conveying direction. In other words, the conveying direction and the length of the metallic workpiece preferably run parallel to each other. According to an advantageous embodiment, the metallic workpiece can be an intermediate product, preferably an intermediate product, which can be conveyed in the conveying direction between a primary forming step and one or more forming steps by one or more temperature change modules of the device.

[0046] The device is preferably designed such that the first temperature change module is configured to change an average temperature of the metallic workpiece to a first average final temperature, and the second temperature change module is configured to change the average temperature of the metallic workpiece to a second average final temperature, wherein the first average final temperature is greater than or equal to the second average final temperature.

[0047] A device designed in this way has the advantage that the temperature of the metallic workpiece can be improved to a precisely the temperature required for forming the metallic workpiece shortly before the metallic workpiece is formed.

[0048] The mean temperature of a metallic workpiece is preferably a volume-averaged mean temperature of the metallic workpiece. The metallic workpiece may, for example, have a surface temperature and a core temperature. The mean temperature can be a volume-averaged mean temperature of the surface temperature and the core temperature.

[0049] The final temperature of a metallic workpiece is preferably a temperature that the metallic workpiece exhibits after changing, preferably immediately after changing, the temperature of the metallic workpiece by a temperature change module. For example, the final temperature of a metallic workpiece is the final temperature of the metallic workpiece immediately after passing through a temperature change module comprising a furnace.

[0050] The device can further be designed such that the first temperature change module is used to change the average temperature of the metallic workpiece to a first average

[0051] The first mean final temperature is set up, and the second temperature change module is set up to change the mean temperature of the metallic workpiece to a second mean final temperature, wherein the first mean final temperature is less than or equal to the second mean final temperature.

[0052] The first temperature change module can be configured to change the surface temperature of the metallic workpiece to a first final surface temperature, and the second temperature change module can be configured to change the surface temperature of the metallic workpiece to a second final surface temperature. The first final surface temperature can be greater than or equal to, or alternatively less than or equal to, the second final surface temperature.

[0053] The first temperature change module can be configured to change the core temperature of the metallic workpiece to a first final core temperature, and the second temperature change module can be configured to change the core temperature of the metallic workpiece to a second final core temperature. The first final core temperature can be greater than or equal to, or alternatively less than or equal to, the second final core temperature.

[0054] The first temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a first final temperature of > 900 °C, preferably > 950 °C, more preferably > 1000 °C, and particularly preferably > 1050 °C. The first temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a first final temperature of > 1075 °C, more preferably > 1125 °C, more preferably > 1150 °C, and particularly preferably > 1175 °C.According to a preferred embodiment, the first temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a first final temperature of > 1200 °C, preferably of > 1225 °C, more preferably of > 1250 °C and particularly preferably of > 1275 °C.

[0055] The second temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a second final temperature of > 900 °C, preferably > 950 °C, more preferably > 1000 °C, and particularly preferably > 1050 °C. The second temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a second final temperature of

[0056] to change the temperature to > 1075 °C, preferably to > 1125 °C, preferably to > 1150 °C, and particularly preferably to > 1175 °C. According to a preferred embodiment, the second temperature change module can be configured to change the mean temperature and / or the core temperature and / or the surface temperature of the metallic workpiece to a second final temperature of

[0057] to change to > 1200 °C, preferably from > 1225 °C, preferably from > 1250 °C and particularly preferably from > 1275 °C.

[0058] Preferably, the device is configured such that the first temperature change module is set up to change a first mean temperature of the metallic workpiece such that a first mean final temperature of the metallic workpiece is greater than a first mean starting temperature of the metallic workpiece, and / or the second temperature change module is set up to change a second mean temperature of the metallic workpiece such that a second mean final temperature of the metallic workpiece is lower than a second mean starting temperature of the metallic workpiece. A device configured in this way has the advantage that the temperature of the metallic workpiece can be set to a required temperature with increased efficiency shortly before forming the metallic workpiece.Furthermore, the device designed in this way has the advantage that the metallic workpiece can be set to the required temperature with increased energy efficiency. For example, the second temperature change module can only have passive temperature change means, so that the second temperature change module can be operated with a reduced amount of energy.

[0059] A starting temperature of a metallic workpiece is preferably a temperature that the metallic workpiece has before, and preferably immediately before, its temperature is changed by a temperature change module. For example, the starting temperature of a metallic workpiece is the starting temperature of the metallic workpiece immediately before passing through a temperature change module comprising a furnace.

[0060] The first temperature change module can be configured to change the initial surface temperature of the metallic workpiece such that the initial surface temperature is higher than the initial surface temperature. The first temperature change module can also be configured to change the initial core temperature of the metallic workpiece such that the initial core temperature is higher than the initial core temperature.

[0061] The second temperature change module can be configured to change a second surface temperature of the metallic workpiece such that a second surface start temperature is higher than a second surface end temperature. The second temperature change module can be configured to change a second core temperature of the metallic workpiece such that a second core start temperature is lower than a second core end temperature. In particular, a second temperature change module can be configured to change the surface temperature and the core temperature of the metallic workpiece such that the temperature difference between a second surface end temperature and a second core end temperature is less than the temperature difference between a second surface start temperature and a second core start temperature of the metallic workpiece.Such a device has the advantage that a metallic workpiece with a more homogeneous temperature distribution can be produced before forming. This allows, for example, the mechanical properties of the metallic workpiece to be improved and adjusted through forming.

[0062] Preferably, the device is designed such that the second temperature change module has at least one furnace, preferably a tunnel furnace, wherein the furnace has a furnace housing that at least partially limits a furnace volume, wherein the metallic workpiece can be conveyed through the furnace volume in the conveying direction.

[0063] A device designed in this way has the advantage that metallic workpieces can be thermally buffered. For example, if the device for the thermal treatment of a metallic workpiece is arranged between a primary forming device, such as a continuous casting device, and a forming device, such as a rolling mill, the rolling process following the primary forming process can be decoupled from the production speed of metallic workpieces by the primary forming device. For example, metallic workpieces exiting the primary forming device can be thermally buffered in the

[0064] The furnace volume of the second temperature change module is absorbed before being conveyed to the forming unit. This allows the metallic workpieces to be formed at a rolling speed that differs from the casting speed, regardless of the casting speed.

[0065] The furnace housing is preferably thermally insulating from the environment. The furnace volume bounded by the furnace housing can have several sub-volumes. The furnace volume or a sub-volume can correspond to a temperature change range. For example, a sub-volume of the furnace volume can be assigned to the second temperature change modulus or to a heating element of the second temperature change modulus.

[0066] More than one heating element can be arranged within the furnace volume. For example, an electric radiant heater, a flameless porous burner, a gas burner, and / or a DFI module can be arranged within the furnace volume. An induction heating device can also be arranged within the furnace volume. Several heating elements can be arranged sequentially within the furnace volume in the direction of conveyance.

[0067] The composition of the furnace atmosphere within the furnace volume can be adjusted. For example, the carbon content, nitrogen content, oxygen content, and / or sulfur content of the furnace atmosphere can be adjusted. The components of the furnace atmosphere can be specified and adjusted as volume percent.

[0068] Preferably, the device is designed such that the first temperature change module is arranged outside the furnace volume. A device designed in this way has the advantage that it can be integrated more flexibly into existing production facilities.

[0069] Alternatively, the first temperature change module can be arranged inside, preferably completely inside, the oven volume.

[0070] Preferably, the device is designed such that the first temperature change module has at least one induction heating device with a coil, wherein the induction heating device is configured to generate a longitudinal magnetic field and / or a transverse magnetic field.

[0071] A device designed in this way has the advantage that a large amount of energy, preferably heating energy, can be introduced into the metallic workpiece within a short conveying distance in the conveying direction. Furthermore, such a device has the advantage that metallic workpieces can be heated with lower carbon emissions.

[0072] The induction heating device can have two coils. Preferably, the two coils are arranged opposite each other with respect to a conveying plane of the metallic workpiece.

[0073] The conveying plane of the metallic workpiece is preferably the plane in which the metallic workpiece is conveyed in the conveying direction. The conveying plane is preferably defined by the conveying direction and a transverse direction, preferably a direction in the width direction of the metallic workpiece. The first temperature change module can be partially arranged in a furnace volume, preferably in the furnace volume of the second temperature change module. For example, a first coil of the first temperature change module can be arranged in a furnace volume, preferably in the furnace volume of the second temperature change module, and a second coil of the first temperature change module can be arranged outside the furnace volume. The first coil can, for example, be arranged such that it is configured to heat a top surface of the metallic workpiece.The second coil can, for example, be arranged in such a way that the second coil is configured to heat an underside of the metallic workpiece.

[0074] Preferably, the device is designed such that the first temperature change module is arranged directly adjacent to the second temperature change module with respect to the conveying direction.

[0075] A device designed in this way has the advantage that heat loss from a metallic workpiece between the first temperature change module and the second temperature change module is reduced, and the device can simultaneously be arranged in a space-saving manner in a production line.

[0076] Between two temperature change modules arranged directly adjacent to each other, no further temperature change module or treatment device is arranged. In other words, two temperature change modules arranged directly adjacent to each other with respect to the conveying direction follow each other directly in the conveying direction. Alternatively, the first temperature change module can be spaced apart from the second temperature change module with respect to the conveying direction.

[0077] The device may include a measuring device arranged between the first temperature change module and the second temperature change module with respect to the conveying direction, wherein the measuring device is configured as a temperature measuring device or as a thickness measuring device. The measuring device may be arranged between two immediately adjacent temperature change modules.

[0078] Alternatively or additionally, the device can include a measuring device arranged within the operating area of ​​a temperature change module, wherein the measuring device is configured as a temperature measuring device or as a thickness measuring device. An operating area of ​​a temperature change module is the area in which the temperature change module is in operative contact with the metallic workpiece, preferably for changing the temperature of the metallic workpiece. For example, the operating area of ​​a temperature change module comprising a furnace is the furnace volume or a portion thereof.

[0079] Preferably, the device is designed such that the first temperature change module is arranged in front of or behind the second temperature change module with respect to the conveying direction.

[0080] If the first temperature change module is arranged downstream of the second temperature change module with respect to the conveying direction, the device, when used as intended, has the advantage that heat loss between the first temperature change module and a treatment unit located downstream of the first temperature change module, with respect to the conveying direction, is minimized. If the first temperature change module is arranged upstream of the second temperature change module with respect to the conveying direction, the device, when used as intended, has the advantage that a greater amount of energy can be introduced into the metallic workpiece per unit of installed nominal power. In this case, the first temperature change module is preferably arranged upstream of an increase in conveying speed, for example, immediately after a primary forming device.

[0081] Preferably, the device is designed such that it has a separating device which is arranged between the first temperature change module and the second temperature change module with respect to the conveying direction; and the first temperature change module is thermally separated from the second temperature change module at least temporarily by the separating device.

[0082] A device designed in this way has the advantage that the first temperature change module is better protected against thermal stress emanating from the second temperature change module. For example, a first temperature change module comprising an induction heating device can be better protected from the thermal radiation emanating from a second temperature change module comprising an oven by the separating device.

[0083] The separating device may include a door or gate that can be moved between an open and a closed position, wherein in the closed position of the door / gate the first temperature change module is thermally separated from the second temperature change module. The separating device may include a radiation shield. The radiation shield may be mechanically connected to the first temperature change module.

[0084] Preferably, the device is designed such that the first temperature change module has a smaller length extent than the second temperature change module, preferably a length extent smaller by a factor of > 2.

[0085] A device designed in this way has the advantage that, with the same installed nominal power of the device, the overall length in the conveying direction of the device can be reduced. If, for example, the first temperature change module has an induction heating device and the second temperature change module has a furnace, for example, a furnace with one or more gas burners, the same or an increased amount of energy can be introduced into the metallic workpiece within a shorter conveying path in the conveying direction using the first temperature change module than with the second temperature change module.

[0086] The first temperature change modulus can have a length extent that is > 3 times smaller than that of the second temperature change modulus, preferably > 4 times smaller, more preferably > 5 times smaller, and most preferably > 7 times smaller. The first temperature change modulus can have a length extent that is > 10 times smaller than that of the second temperature change modulus, more preferably > 15 times smaller, more preferably > 25 times smaller, and most preferably > 50 times smaller.Preferably, the device is designed such that it has a control and regulating device which is data-connected to the first temperature change module and the second temperature change module; and the control and regulating device is configured to regulate and / or control an operating parameter of the first temperature change module depending on an operating parameter of the second temperature change module.

[0087] A device designed in this way has the advantage that the temperature of a metallic workpiece can be precisely controlled. For example, if, during normal use of the device, the temperature of a metallic workpiece required for a forming unit downstream of the device cannot be reached after it exits the second temperature control module, an operating parameter of the first temperature control module, such as the amount of energy supplied to the tool, can be adjusted so that the temperature required for the forming unit is achieved. If the first temperature control module incorporates an induction heating element, carbon emissions can be reduced simultaneously.

[0088] According to an alternative implementation, the control and regulation device can be configured to regulate and / or control an operating parameter of the first temperature change module independently of an operating parameter of the second temperature change module.

[0089] An operating parameter of a temperature change module can be the amount of energy to be introduced into the metallic workpiece. An operating parameter can, for example, be the final temperature of the metallic workpiece after a temperature change by a temperature change module. An operating parameter can be a nominal temperature within a temperature change range of a temperature change module.

[0090] Preferably, the device is designed such that it has a third temperature change module, wherein the third temperature change module is arranged in front of or behind the first temperature change module with respect to the conveying direction.

[0091] The third temperature change module can be positioned upstream or downstream of the second temperature change module, relative to the conveying direction. The third temperature change module can also be positioned in the same location as the second temperature change module, relative to the conveying direction. For example, the third temperature change module can be positioned parallel to the second temperature change module.

[0092] The third temperature change module can achieve a nominal power density of > 2-10 4 w / m 2 , > 9-10 4 w / m 2 , > 1-10 5 w / m 2 , > 2-10 5 w / m 2 , > 3.5-10 5 w / m2 , > 5-10 5 w / m 2 , > 7-10 5 w / m 2 , > 8.5-10 5 w / m 2 , > 1-10 6 w / m 2 or > 2 -IO 6 w / m 2 exhibit.

[0093] The third temperature change module can include one or more passive temperature change devices and / or one or more active temperature change devices.

[0094] The third temperature change module and / or a heating element of the third temperature change module can be movably mounted transversely to the conveying direction of the metallic workpiece. For example, the third temperature change module and / or a heating element of the third temperature change module can be displaced transversely to the conveying direction of the metallic workpiece.

[0095] In a preferred embodiment of the device, the first temperature change module has an induction heating device and is arranged upstream of the second temperature change module with respect to the conveying direction. In another preferred embodiment, the third temperature change module has an induction heating device and is arranged downstream of the second temperature change module with respect to the conveying direction. A device designed in this way has the advantage that the first temperature change module allows an increased amount of energy to be introduced into the metallic workpiece, while simultaneously reducing heat losses from the metallic workpiece before it enters a forming device.

[0096] In a further preferred embodiment of the device, the first temperature change module comprises an induction heating device and is arranged upstream of the second temperature change module with respect to the conveying direction. In a further preferred embodiment, the third temperature change module comprises a furnace, preferably a tunnel furnace, and is arranged upstream of the first temperature change module with respect to the conveying direction. A device designed in this way has the advantage that, when the device is used as intended, heat losses between a primary forming unit and the first temperature change module are reduced by the third temperature change module. This allows for improved decoupling of subsequent forming of metallic workpieces.At the same time, an increased amount of energy can be introduced into the metallic workpiece through the first temperature change module.

[0097] The problem underlying the invention is further solved by a production line for the manufacture and / or processing of a metallic workpiece, wherein the production line comprises a first treatment device for treating the metallic workpiece and a second treatment device for treating the metallic workpiece, wherein the first treatment device is arranged at a distance from the second treatment device with respect to a conveying direction of the metallic workpiece; a conveying device for conveying the metallic workpiece in the conveying direction from the first treatment device to the second treatment device; and a previously described device, wherein the device is arranged between the first treatment device and the second treatment device with respect to the conveying direction.

[0098] A production line designed in this way offers the advantage that the temperature of the metallic workpiece can be precisely set to the temperature required for forming before the workpiece is formed, while simultaneously increasing the energy efficiency of the production line. A high-power-density initial temperature control module allows a large amount of energy to be introduced into the metallic workpiece within a short time and over a short conveyor distance, thus increasing its temperature.By combining such a temperature change module with a second temperature change module with thermal inertia, a rapid temperature change of the metallic workpiece by the first temperature change module can be combined with a thermal buffer effect by the second temperature change module, so that a precise setting of the temperature of the metallic workpiece is improved.

[0099] It should be noted that the advantages of the device described above extend directly to a production line for the manufacture and / or processing of a metallic workpiece. It should be expressly pointed out that the device described above can be advantageously combined with the components of the production line described above, either individually or cumulatively in any combination.

[0100] A treatment device can be configured to treat a metallic workpiece. In particular, a treatment device can be designed as a forming device, preferably as a pressure forming device. In a pressure forming device, a metallic workpiece is formed by compressive forces. A pressure forming device can be a rolling device. Advantageously, a metallic workpiece with a starting thickness of greater than or equal to 5 mm is pressure formed, in particular rolled, preferably with a starting thickness of greater than or equal to 10 mm, and particularly preferably with a starting thickness of greater than or equal to 30 mm.

[0101] The processing device can further be configured as a tensile forming device, wherein the tensile forming device is configured to deform the metallic workpiece by tensile forces. A tensile forming device can be a stretching device, in particular a stretching device for improving the flatness of the metallic workpiece. Advantageously, a metallic workpiece with a starting thickness of less than or equal to 12 mm is tensile formed, in particular stretched, preferably with a starting thickness of less than or equal to 10 mm, and particularly preferably with a starting thickness of less than or equal to 5 mm.

[0102] A treatment facility can be designed as a primary forming facility, in particular a continuous casting facility.

[0103] A conveyor system is preferably configured for transporting a metallic workpiece, in particular for transporting slabs or metal strips. Preferably, a conveyor system includes a roller conveyor, in particular an electrically driven roller conveyor. The roller conveyor may have sections with roller conveyor cooling. A conveyor system may have several different segments, in particular a first segment between a first temperature change module and a second temperature change module, and a second segment between a second temperature change module and a treatment unit. It is understood that a conveyor system may also have further segments between components of the device and / or the production line.

[0104] Furthermore, a conveying device can be set up to convey a metallic workpiece from a second temperature change module to a first temperature change module.

[0105] Preferably, the production line is configured such that it has a third treatment unit, wherein the first treatment unit and the third treatment unit each have a primary forming unit, in particular a continuous casting unit; the first treatment unit is configured to produce a metallic workpiece and the third treatment unit is configured to produce another metallic workpiece; the second temperature change module is configured to change an average temperature of the metallic workpiece; and a third temperature change module is configured to change a further average temperature of the further metallic workpiece.

[0106] A production line designed in this way has the advantage that an increased quantity of metallic workpieces can be produced, while simultaneously increasing the utilization of other processing equipment, particularly the forming equipment. This allows the production line to be operated more efficiently with a higher rolling speed, thus increasing output.

[0107] The second temperature change module can be configured to change the mean temperature of the metallic workpiece simultaneously with a change in the mean temperature of the other metallic workpiece by the third temperature change module.

[0108] The problem underlying the invention is further solved by a method for thermally treating a metallic workpiece conveyed in a conveying direction, preferably with a previously described device or with a previously described production line, wherein the method comprises the following steps:

[0109] First change of the temperature of the metallic workpiece ( 2 ); and

[0110] Secondly, changing the temperature of the metallic workpiece while the metallic workpiece is conveyed through a temperature change area, wherein the temperature of the temperature change area can be changed at a temperature change rate of less than or equal to 20 K / min.

[0111] It should be noted that the advantages of a previously described device and / or a previously described production line extend directly to a method for the thermal treatment of a metallic workpiece conveyed in a conveying direction. It should be expressly noted that the object of the previously described device can be advantageously combined with the objects of the previously described production line and the previously described method, either individually or cumulatively in any combination. The temperature change range can be assigned to a second temperature change module, preferably the second temperature change module of the previously described device. The initial temperature change of the metallic workpiece can be carried out by means of a first temperature change module, preferably by means of the first temperature change module of the previously described device.The second change in the temperature of the metallic workpiece can be carried out by means of a second temperature change module, preferably by means of the second temperature change module of the device described above.

[0112] The procedure may include the following step:

[0113] Thirdly, changing the temperature of the metallic workpiece, preferably by means of a third temperature change module, particularly preferably by means of the third temperature change module of the device described above.

[0114] The problem underlying the invention is further solved by using a previously described device for the thermal treatment of a metallic workpiece.

[0115] The problem underlying the invention is further solved by using a previously described production line for the manufacture and / or processing of a metallic workpiece.

[0116] Further advantages, details, and features of the invention will become apparent from the illustrated examples below. Specifically, the following will be shown:

[0117] Figure 1: a schematic representation of a device according to a first embodiment; Figure 2: a schematic representation of a device according to a second embodiment;

[0118] Figure 3: a schematic representation of a production line according to a third execution form;

[0119] Figure 4: a schematic representation of a production line according to a fourth execution form; and

[0120] Figure 5: a schematic representation of a production line according to a fifth execution form.

[0121] In the following description, identical reference symbols denote identical components or identical features, so that a description given for one component in relation to one figure also applies to the other figures, thus avoiding repetitive descriptions. Furthermore, individual features described in connection with one embodiment can also be used separately in other embodiments.

[0122] Figure 1 shows a schematic representation of a device 1 for the thermal treatment of a metallic workpiece 2 conveyed in a conveying direction RI according to a first embodiment. The device 1 has a first temperature change module 10 and a second temperature change module 20, wherein the first temperature change module 10 has a higher nominal power density than the second temperature change module 20, and wherein the second temperature change module 20 is configured to change the temperature of a temperature change range associated with the second temperature change module 20 at a temperature change rate of less than or equal to 20 K / min.The first temperature change module 10 is arranged immediately adjacent to the second temperature change module 20 with respect to the conveying direction RI, with the first temperature change module 10 being arranged behind the second temperature change module 20 with respect to the conveying direction RI. The first temperature change module 10 has a smaller length than the second temperature change module 20.

[0123] Figure 2 shows a schematic representation of a device 1 for the thermal treatment of a metallic workpiece 2, conveyed in a conveying direction RI (but not shown in Figure 2), according to a second embodiment. The device 1 has a third temperature change module 30, wherein the third temperature change module 30 is arranged upstream of the second temperature change module 20 with respect to the conveying direction RI. The device 1 has two separating devices 40, wherein one separating device 40 is arranged between the first temperature change module 10 and the second temperature change module 20 with respect to the conveying direction RI, and the other separating device 40 is arranged between the third temperature change module 30 and the second temperature change module 20 with respect to the conveying direction RI.The separating device 40 arranged between the third temperature-changing module 30 and the second temperature-changing module 20 is designed as a radiation shield 41 and is configured to thermally separate the third temperature-changing module 30 from the second temperature-changing module 20. The separating device 40 arranged between the first temperature-changing module 10 and the second temperature-changing module 20 has a gate 42 that can be moved between an open position and a closed position (shown with dashed lines in Figure 2), whereby in the closed position of the gate 42 the first temperature-changing module 10 is thermally separated from the second temperature-changing module 20. The third temperature-changing module 30 can be mounted so as to be displaceable in a transverse direction.

[0124] Figure 3 shows a schematic representation of a production line 100 for the manufacture and / or processing of a product shown in Figure

[0125] 3 metallic workpiece 2 not shown according to a third embodiment. The production line 100 comprises a first treatment unit 50 for treating the metallic workpiece 2 and a second treatment unit 60 for treating the metallic workpiece 2, wherein the first treatment unit 50 is spaced apart from the second treatment unit 60 with respect to the conveying direction RI of the metallic workpiece 2; a conveying unit (not shown in Figure 3) for conveying the metallic workpiece 2 in the conveying direction RI from the first treatment unit 50 to the second treatment unit 60; and a device 1 according to the first embodiment, wherein the device 1 is arranged between the first treatment unit 50 and the second treatment unit 60 with respect to the conveying direction RI.

[0126] The first treatment unit 50 is designed as a continuous casting unit 51 and the second treatment unit 60 is designed as a forming unit 61.

[0127] Finally, production line 100 includes a winding device 80 for winding manufactured and / or processed metallic workpieces 2. The winding device 80 is arranged downstream of the second processing device 60 with respect to the conveying direction RI.

[0128] Figure 4 shows a schematic representation of a production line 100 for the manufacture and / or processing of a product shown in Figure

[0129] 4 metallic workpieces 2 (not shown) according to a fourth embodiment. The production line 100 has a first device 1 arranged between the continuous casting unit 51 and the forming unit 61 with respect to the conveying direction RI, wherein the first device 1 has a first, a second and a third temperature change module 10, 20 and 30. The first temperature change module 10 is arranged upstream of the second temperature change module 20 with respect to the conveying direction RI. The third temperature change module 30 is arranged downstream of the second temperature change module 20 with respect to the conveying direction RI. The second temperature change module 20 has a tunnel furnace. The first temperature change module 10 and the third temperature change module 30 each have an induction heating device.

[0130] Production line 100 further comprises a third treatment unit 70, which is designed as a forming unit 72 and is arranged downstream of the second treatment unit 60 with respect to the conveying direction RI. Production line 100 also comprises a second device 1 arranged between the forming unit 61 and the forming unit 72 with respect to the conveying direction RI, wherein the second device 1 comprises a first, a second, and a third temperature change module 10, 20, and 30. The first temperature change module 10 is arranged upstream of the second temperature change module 20 with respect to the conveying direction RI. The third temperature change module 30 is arranged upstream of the first temperature change module 10 with respect to the conveying direction RI. The second temperature change module 20 and the third temperature change module 30 each comprise a tunnel furnace.The first temperature change module 10 has an induction heating device.

[0131] Figure 5 shows a schematic representation of a production line 100 for the manufacture and / or processing of a metallic workpiece 2 (not shown in Figure 5) according to a fifth embodiment. The production line 100 includes a third treatment unit 70 designed as a continuous casting unit 71.

[0132] The continuous casting unit 51 and the continuous casting unit 71 are arranged spaced apart from each other in a transverse direction. The second temperature change module 20 is located downstream of the continuous casting unit 51 with respect to the conveying direction RI and in the same position as the continuous casting unit 51 with respect to the transverse direction. The third temperature change module 30 is located downstream of the continuous casting unit 71 with respect to the conveying direction RI and in the same position as the continuous casting unit 71 with respect to the transverse direction.

[0133] The second temperature change module 20 is configured to change the mean temperature of the metallic workpiece 2 produced by the continuous casting device 51, and the third temperature change module 30 is configured to change the mean temperature of the metallic workpiece 2 produced by the continuous casting device 71.

[0134] The first temperature change module 10, arranged downstream of the second and third temperature change modules 20 and 30 with respect to the conveying direction RI, is designed to change the mean temperature of metallic workpieces 2 produced by the continuous casting unit 51 and by the continuous casting unit 71. Reference numeral list

[0135] 1 (First / Second) Device

[0136] 2. Metallic workpiece

[0137] 10 First temperature change module

[0138] 20 Second temperature change module

[0139] 30 Third temperature change module

[0140] 40 Separation device

[0141] 41 radiation shield

[0142] 42 goals

[0143] 50 First treatment facility

[0144] 51 Continuous casting equipment

[0145] 60 Second treatment facility

[0146] 61 Converter

[0147] 70 Third Treatment Facility

[0148] 71 Continuous casting equipment

[0149] 72 Converter

[0150] 80 Winding device

[0151] 100 production line

[0152] RI Conveyor Direction

Claims

39 / 44 Patent claims 1. Device (1) for the thermal treatment of a metallic workpiece (2) conveyed in a conveying direction (RI), comprising: a first temperature change module (10) and a second temperature change module (20), wherein the first temperature change module (10) has a higher nominal power density than the second temperature change module (20); and wherein the second temperature change module (20) is configured to change the temperature of a temperature change range associated with the second temperature change module (20) at a temperature change rate of less than or equal to 20 K / min.

2. Device (1) according to claim 1, wherein the first temperature change module (10) is configured to change an average temperature of the metallic workpiece (2) to a first average final temperature; the second temperature change module (20) is configured to change the average temperature of the metallic workpiece (2) to a second average final temperature; and wherein the first average final temperature is greater than or equal to the second average final temperature.

3. Device (1) according to one of the preceding claims, wherein the first temperature change module (10) is configured to change a first mean temperature of the metallic workpiece (2) such that a first mean final temperature of the metallic workpiece (2) is greater than a first mean starting temperature of the metallic workpiece (2); and / or the second temperature change module (20) is configured to change a second mean temperature of the metallic workpiece (2) such that a second mean final temperature of the metallic workpiece (2) is lower than a second mean starting temperature of the metallic workpiece (2).

4. Device (1) according to one of the preceding claims, wherein the second temperature change module (20) comprises at least one furnace, preferably a tunnel furnace, wherein the furnace comprises a furnace housing that at least partially limits a furnace volume, wherein the metallic workpiece (2) can be conveyed through the furnace volume in the conveying direction (RI).

5. Device (1) according to claim 4, wherein the first temperature change module (10) is arranged outside the oven volume.

6. Device (1) according to one of the preceding claims, wherein the first temperature change module (10) has at least one induction heating device with a coil, wherein the induction heating device is configured to generate a longitudinal magnetic field and / or a transverse magnetic field.

7. Device (1) according to one of the preceding claims, wherein the first temperature change module (10) is arranged directly adjacent to the second temperature change module with respect to the conveying direction (RI).

8. Device (1) according to one of the preceding claims, wherein the first temperature change module (10) is related to the 41 / 44 The conveying direction (RI) is arranged in front of or behind the second temperature change module (20).

9. Device (1) according to one of the preceding claims, wherein the device (1) has a separating device (40) which is arranged between the first temperature change module (10) and the second temperature change module (20) with respect to the conveying direction (RI); and the first temperature change module (10) is thermally separated from the second temperature change module (20) at least temporarily by the separating device (40).

10. Device (1) according to one of the preceding claims, wherein the first temperature change module (10) has a smaller length extent than the second temperature change module (20), preferably a length extent smaller by a factor of > 2 .

11. Device (1) according to one of the preceding claims, wherein the device (1) comprises a control and regulating device which is data-connected to the first temperature change module (10) and the second temperature change module (20); and the control and regulating device is configured to control and / or regulate an operating parameter of the first temperature change module (10) depending on an operating parameter of the second temperature change module (20).

12. Device (1) according to one of the preceding claims, wherein the device (1) has a third temperature change module (30), wherein the third temperature change module (30) is located in front of or behind the first temperature change module with respect to the direction of conveyance (RI).

13. Production line (100) for the manufacture and / or processing of a metallic workpiece, comprising: a first treatment unit (50) for treating the metallic workpiece (2) and a second treatment unit (60) for treating the metallic workpiece (2), wherein the first treatment unit (50) is spaced apart from the second treatment unit (60) with respect to a conveying direction (RI) of the metallic workpiece (2); a conveying unit for conveying the metallic workpiece (2) in the conveying direction (RI) from the first treatment unit (50) to the second Treatment device (60); and a device (1) according to one of the preceding claims, wherein the device (1) is arranged between the first treatment device (50) and the second treatment device (60) with respect to the conveying direction (RI).

14. Production line (100) according to claim 13, wherein the production line (100) comprises a third treatment unit (70), wherein the first treatment unit (50) and the third treatment unit (70) each comprise a primary forming unit, in particular a continuous casting unit (51, 71); the first treatment unit (50) is configured to produce a metallic workpiece (2) and the third treatment unit (70) is configured to produce a further metallic workpiece (2); the second temperature change module (20) is configured to change an average temperature of the metallic workpiece (2); and a third temperature change module (30) is set up to change a further mean temperature of the further metallic workpiece (2).

15. Method for thermally treating a metallic workpiece (2), preferably with a device (1) according to one of claims 1 to 12 or with a production line (100) according to one of claims 13 or 14, wherein the method comprises the following steps: First change of the temperature of the metallic workpiece ( 2 ); and Secondly, changing the temperature of the metallic workpiece (2) while the metallic workpiece (2) is conveyed through a temperature change area, wherein a temperature of the temperature change area can be changed at a temperature change rate of less than or equal to 20 K / min.

16. Use of a device (1) according to one of claims 1 to 12 for the thermal treatment of a metallic workpiece ( 2 ).

17. Use of a production line according to one of claims 13 or 14 for the manufacture and / or processing of a metallic workpiece (2) .

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