Thermal treatment device, method and use

Abstract

The invention relates to a thermal treatment device for heating and treating a metal product, comprising: a heating device having a nominal power density into the metal product of greater than or equal to 5·105 W / m2, preferably greater than or equal to 1·106 W / m2, more preferably greater than or equal to 5·106 W / m2 and particularly preferably greater than or equal to 2·107 W / m2, in particular a first heating device; a homogenizing device, in particular a first homogenizing device, the homogenizing device being designed to reduce a temperature difference between a surface temperature of the metal product and a core temperature of the metal product to less than or equal to 50°C, preferably to less than or equal to 20°C and particularly preferably to less than or equal to 10°C; a treatment device for treating the metal product; and a conveying device for conveying the metal product from the heating device toward the treatment device.

Description

[0001] Heat treatment equipment, process and use

[0002] The invention relates to a heat treatment device, a method and a use.

[0003] Before hot forming, in particular hot rolling, a slab is heated in the prior art using a furnace. The slab can first be heated to a temperature greater than or equal to the carbonitride precipitation temperature and / or the dissolution temperature of nitrite precipitations in the steel composition of the slab, in particular to an average slab temperature, which, depending on the alloy composition, is between 950 °C and 1,280 °C.

[0004] The invention is based on the object of providing an improvement or an alternative to the prior art.

[0005] According to a first aspect of the invention, the object is achieved by a heat treatment device for heating and treating a metallic material, comprising: a heating device with a nominal power density in the metallic material of greater than or equal to 5-10 5 W / m 2 , preferably greater than or equal to 1-10 6 W / m 2 , preferably greater than or equal to 5-10 6 W / m 2 and particularly preferably greater than or equal to 2 -IO 7 W / m 2, in particular a first heating device; a homogenization device, in particular a first homogenization device, wherein the homogenization device is designed to reduce a temperature difference between a surface temperature of the metallic material and a core temperature of the metallic material to less than or equal to 50 ° C, preferably to less than or equal to 20 ° C and particularly preferably to less than or equal to 10 ° C; a treatment device for treating the metallic material; and a conveying device for conveying the metallic material from the heating device in the direction of the treatment device.

[0006] The following term is explained in this regard:

[0007] First of all, it should be expressly pointed out that in the context of this patent application, indefinite articles and numerical expressions such as "one", "two", etc. are generally to be understood as "at least" expressions, i.e. as "at least one...", "at least two...", etc., unless it is expressly clear from the respective context or it is obvious or technically necessary for the person skilled in the art that only "exactly one...", "exactly two...", etc. can be meant.

[0008] In the context of this patent application, the expression "in particular" should always be understood as introducing an optional, preferred feature. The expression should not be understood as "and indeed" or "namely".

[0009] A "metallic good" is understood to mean a semi-finished product which consists of 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.% and particularly preferably a metal content of greater than or equal to

[0010] 98% by weight.

[0011] The metallic material has a thickness, a width, and a length, whereby the metallic material can alternatively also have an endless length. The metallic material further has a surface and a core region, whereby a temperature, in particular an average temperature, of a metallic material at the surface can differ from a temperature in the core region. Accordingly, a surface temperature of the metallic material can differ from a core temperature of the metallic material, in particular due to a heat flow from the surroundings of the metallic material into the metallic material and / or due to a heat flow from the metallic material to the surroundings of the metallic material.

[0012] A metallic product can be a billet, wherein a billet has a thickness that substantially corresponds to the width of the billet. In other words, a billet has a substantially square cross-sectional area. Preferably, the thickness of a billet is greater than or equal to 0.9 of the billet width and less than or equal to 1.1 of the billet width; preferably, the thickness of a billet is greater than or equal to 0.95 of the billet width and less than or equal to 1.05 of the billet width; and particularly preferably, the thickness of a billet is greater than or equal to 0.975 of the billet width and less than or equal to 1.025 of the billet width.

[0013] A metallic product can be a bloom. The width of a bloom is preferably less than or equal to 1.4 times the thickness of the bloom, preferably less than or equal to 1.3 times the thickness of the bloom, and particularly preferably less than or equal to 1.2 times the thickness of the bloom. Furthermore, the width of a bloom is preferably greater than or equal to 1.1 times the thickness of the bloom, preferably greater than or equal to 1.15 times the thickness of the bloom, and particularly preferably greater than or equal to 1.2 times the thickness of the bloom.

[0014] A metallic good can be a slab.

[0015] Preferably, the width of a slab is less than or equal to 35 thicknesses of the slab, preferably less than or equal to 30 thicknesses of the slab, and particularly preferably less than or equal to 20 thicknesses of the slab. Furthermore, the width of a slab is preferably greater than or equal to 1.5 thicknesses of the slab, preferably greater than or equal to 1.6 thicknesses of the slab, and particularly preferably greater than or equal to 2 thicknesses of the slab.

[0016] A slab is also referred to as a thick slab if it has a thickness of greater than or equal to 150 mm, preferably a thickness of greater than or equal to 180 mm and particularly preferably a thickness of greater than or equal to 220 mm.

[0017] A slab is also referred to as a thin slab if it has a thickness of less than or equal to 150 mm, preferably a thickness of less than or equal to 135 mm and particularly preferably a thickness of less than or equal to 120 mm.

[0018] Preferably, a slab has a length of greater than or equal to 1.2 m, 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 of greater than or equal to 4 m, 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.

[0019] A metallic product can be a sheet metal. Preferably, a sheet metal has a thickness of less than or equal to 100 mm, preferably a thickness of less than or equal to 80 mm and particularly preferably a thickness of less than or equal to 50 mm. Furthermore, the width of a sheet metal is preferably greater than or equal to 30 thicknesses of the sheet metal, preferably greater than or equal to 50

[0020] thicknesses of the sheet and particularly preferably greater than or equal to 100 thicknesses of the sheet .

[0021] A "heating device", in particular a first heating device and / or a second heating device, is understood to mean a device which is designed to increase the average temperature in a metallic material, in particular starting from an average starting temperature to an average final temperature. A heating device can be in a primary operative connection to one or more surfaces of the metallic material. Preferably, a heating device acts primarily on the surface of the upper side and the surface of the lower side of the metallic material.

[0022] A "power density" is a surface power density with the unit W / m 2understood, where the power density refers to the distribution of the power of a heating device over a surface of the metallic material, in particular the surface of the upper side of the metallic material and the surface of the lower side of the metallic material. A "nominal power density" is understood to mean the maximum achievable power density of a heating device during designated operation. A heating device with a nominal power density of greater than or equal to 5 - 10 5 W / m 2 is therefore designed to achieve a power of greater than or equal to 5 - 10 5W per square meter of the surface of the metallic item. In some cases, where the edges of the metallic item are specifically heated separately, the surface of the metallic item relevant for determining the power density can also extend to the side surface of the metallic item heated by an edge heater beyond the top and bottom of the metallic item. Preferably, the heating device has a nominal power density of greater than or equal to 9-10 5 W / m 2 on, furthermore preferably greater than or equal to 1-10 6 W / m 2 , preferably greater than or equal to 2 -IO 6 W / m 2 and especially preferably greater than or equal to

[0023] 3.5-10 6 W / m 2 . Furthermore, the heating device preferably has a nominal power density of greater than or equal to 7 -IO 6 W / m 2 preferably greater than or equal to 8.5-106 W / m 2 and particularly preferably greater than or equal to 1-10 7 W / m 2 .

[0024] The actual power density introduced into the metallic material by the heating device can be limited, in particular by controlling and / or regulating the heating device, if there is a risk of exceeding a surface temperature of 1300 °C, or, depending on the alloy composition, even exceeding a surface temperature of 1380 °C. This can prevent melting of the surface of the metallic material.

[0025] An "inductor" is understood to be a device designed to increase the temperature of a metallic material using a magnetic field. An inductor has at least one inductor coil, which, in operative connection with at least one capacitor, forms an oscillating circuit. This oscillating circuit can be supplied with electrical energy by a power supply device. The power supply device can have an inverter, which is preferably connected or can be connected to a DC intermediate circuit.

[0026] An inductor can have a nominal power density greater than or equal to 1-10 6 W / m 2 preferably greater than or equal to

[0027] 8.5-10 6 W / m 2 and particularly preferably greater than or equal to 1-10 7 W / m 2The use of an inductor as a heating device has the advantage that the nominal power density is independent of the ambient temperature of the metallic material. This is particularly advantageous for heating the metallic material at high average final temperatures.

[0028] Preferably, an inductor has two inductor coils. These can be configured to generate a transverse field and / or a longitudinal field relative to the metallic material.

[0029] During designated operation, an inductor has a heat-generating layer, starting from a surface of the metallic material to be heated, which surface faces an inductor coil. This heat-generating layer essentially extends over a penetration depth into the metallic material to be heated. The penetration depth of the heat-generating layer is also dependent on the frequency of an oscillating circuit used to excite an inductor coil. However, the penetration depth of the heat-generating layer is also dependent on the temperature of the metallic material in the region of the heat-generating layer.

[0030] If the temperature of the material to be heated in the region of the heat development layer is lower than the Curie temperature for the material of the metallic material, the heat development layer can have a penetration depth of less than or equal to 4 mm, preferably less than or equal to 3 mm and particularly preferably less than or equal to 2 mm.

[0031] If the temperature of the material to be heated in the region of the heat development layer is greater than or equal to the Curie temperature, the heat development layer can have a penetration depth of less than or equal to 25 mm, preferably less than or equal to 20 mm and particularly preferably less than or equal to 15 mm. Furthermore, if the temperature of the material to be heated in the region of the heat development layer is greater than or equal to the Curie temperature, the heat development layer can have a penetration depth of greater than or equal to 5 mm, preferably greater than or equal to 7 mm and particularly preferably greater than or equal to 10 mm.

[0032] A heating device can comprise a plurality of inductors, in particular two inductors, three inductors, four inductors, five inductors, or more than five inductors. This plurality of inductors can be arranged in a common inductor housing. Alternatively, the plurality of inductors can comprise separate inductor housings, which can be arranged in a sequence relative to one another in the designated conveying direction of the metallic material.

[0033] A "DFI module" is understood to be a heating device which is designed to apply a Direct Flame Impingement (DFI) process to heat the metallic material. The DFI process is also known as the oxyfuel process. In the DFI process, at least one oxyfuel flame or an oxygen flame heats the metallic material directly, in particular by direct action on the metallic material. The nominal power density achievable with the DFI process can be up to ten times higher than with conventional fuel-fired furnaces. The nominal power density of a DFI module can be 1 - 10 6 W / m 2 to reach .

[0034] A heating device may comprise 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.

[0035] This plurality of DFI modules can be arranged in a common housing. Alternatively, the plurality of DFI modules can have separate housings, which are arranged in a sequence in the designated conveying direction of the metallic material. A "homogenization device", in particular a first homogenization device and / or a second homogenization device, is understood to mean a device that is designed to homogenize the temperature profile in a metallic material. In other words, a homogenization device is designed to reduce temperature differences in a metallic material.

[0036] Heating and / or cooling a metallic item can cause significant temperature differences within the metallic item. When a metallic item cools, the core of the metallic item cools more slowly than its surface. When a metallic item is heated, the surface of the metallic item can also heat up faster than its core. Furthermore, temperature differences can also arise from a treatment process of the metallic item and / or a casting process.

[0037] When casting a slab using a continuous casting plant, the casting speed at which a cast strand leaves the continuous casting plant can be less than or equal to 0.14 m / s, in particular less than or equal to 0.1 m / s. Accordingly, periods of 2 minutes are usual for casting a slab with a length of 12 m. During this time, a slab head that left the continuous casting plant first cools down faster than a slab end. A temperature difference in a metallic material should therefore not only be understood to mean that a temperature distribution only varies across the cross-section of the metallic material; it can also vary along the length of the metallic material.

[0038] Homogenization of a temperature of a metallic

[0039] Goods can be understood as a reduction of an absolute temperature difference of the metallic material when entering the homogenization device until the metallic material exits the homogenization device.

[0040] If a slab is reheated with an inductor immediately after leaving a continuous casting plant, the absolute temperature difference, particularly between the core of the slab and the surface of the slab, may be greater than or equal to 100 ° C. In some cases, the temperature difference may be greater than or equal to 300 ° C, and in the case of very intensive heating using an inductor, it may even be greater than or equal to 650 ° C.

[0041] If a slab is heated intensively from room temperature using an inductor, the temperature difference may be greater than or equal to 1,000 °C, and in special cases greater than or equal to 1,300 °C.

[0042] A homogenization device can be designed to reduce the temperature difference of a metallic material up to the point of exit from the homogenization device to less than or equal to 100 ° C, preferably to less than or equal to 60 ° C, further preferably to less than or equal to 30 ° C and particularly preferably to less than or equal to 15 ° C.

[0043] A homogenization device can further be designed so that a metallic material can leave the homogenization device with an average temperature of greater than or equal to 950 ° C, preferably with an average temperature of greater than or equal to 1 , 000 ° C and particularly preferably with an average temperature of greater than or equal to 1 , 050 ° C .

[0044] A homogenization device can expediently comprise an active means for heating a metallic material, in particular at least one gas burner, preferably in combination with at least one corresponding radiant tube. Among other things, a homogenization device can be designed as a walking beam furnace. A homogenization device can be designed as a roller furnace. A homogenization device can be designed as a pusher furnace. A nominal power density of a gas burner can be 1 - 10 5 W / m 2 to reach .

[0045] Alternatively, a homogenization device can comprise at least one heat radiator as an active means for heating a metallic material, in particular at least one heat radiator operated with electrical energy, wherein a heat radiator is designed to emit thermal radiation to a metallic material. An electrically operated heat radiator can have a nominal power density of 4 - 104 W / m 2 to reach .

[0046] According to an expedient embodiment, a homogenization furnace may comprise a heat-holding device as a passive means for homogenizing the temperature distribution of the metallic material, which is designed for thermal insulation of the metallic material from its surroundings.

[0047] Particularly preferably, in terms of energy, a homogenization device can comprise only a passive means for homogenizing the temperature distribution of the metallic material, in particular an insulation device, preferably a heat hood. This allows the thermal energy with which the metallic material enters the homogenization device to be used to even out the temperature distribution in the metallic material.

[0048] A “treatment facility” is a facility with which a metallic item can be treated.

[0049] According to a further variant, a treatment device can be designed as a pressure-forming device, wherein a metallic material is formed by compressive forces. A pressure-forming device can be a rolling device. Advantageously, a metallic material 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.

[0050] A tensile forming device can also be used as a further variant of a treatment device, wherein the tensile forming device is designed to deform the metallic material using tensile forces. A tensile forming device can be a stretching device, in particular a stretching device for improving the flatness of the metallic material. Advantageously, a metallic material with a starting thickness of less than or equal to 12 mm is pressure-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.

[0051] A "conveying device" is understood to mean any system which is designed to transport a metallic product, in particular to transport slabs. A conveying device preferably has a roller table, in particular an electrically driven roller table.

[0052] A conveying device can have a plurality of different segments, in particular a first segment between a heating device and a homogenizing device and a second segment between a homogenizing device and a treatment device or a final stage heating device. It is understood that a conveying device can also have further segments between system components of the heat treatment device. However, this does not explicitly rule out the possibility that a heat treatment device can have a plurality of conveying devices, in particular a first conveying device between a heating device and a homogenizing device and a second conveying device between a homogenizing device and a treatment device or a final stage heating device.

[0053] Furthermore, a conveying device can be configured to convey a metallic material from a homogenizing device to a heating device, in particular from a homogenizing device which is operatively connected to a continuous casting machine and which can be configured to at least partially receive the cast strand, to a heating device, in particular a first heating device.

[0054] A "heat treatment device" is understood to mean a device and / or a system which is designed to heat a metallic material from an average starting temperature of a metallic material upon reaching a heating device to an average final temperature of a metallic material upon leaving a heating device and / or a homogenisation device and to treat the metallic material in a treatment device, in particular to roll it, wherein the heat treatment device has at least one conveying device which is designed to convey the metallic material in the direction of the treatment device.

[0055] The heat treatment device can be set up so that a metallic product has an average temperature of greater than or equal to 1,050°C upon reaching the treatment device, preferably greater than or equal to 1,100°C and particularly preferably greater than or equal to 1,200°C. The heat treatment device can also advantageously be set up so that a metallic product has an average temperature of greater than or equal to 950°C upon reaching the treatment device, preferably greater than or equal to 1,050°C and particularly preferably greater than or equal to 1,250°C. The heat treatment device can be set up so that a metallic product has an average temperature of less than or equal to 250°C upon reaching a heating device, in particular the first heating device, preferably less than or equal to 200°C and particularly preferably less than or equal to 150°C.Furthermore, the heat treatment device can be advantageously configured so that a metallic material, upon reaching a heating device, in particular the first heating device, has an average temperature of less than or equal to 100 ° C, preferably less than or equal to 50 ° C and particularly preferably less than or equal to 35 ° C. In this case, the metallic material can also be referred to as cold insertion into the heat treatment device.

[0056] The heat treatment device can expediently be set up so that a metallic item, upon reaching a heating device, in particular the first heating device, has an average temperature of less than or equal to 650 ° C, preferably less than or equal to 550 ° C and particularly preferably less than or equal to 450 ° C. In this case, the metallic item can also be referred to as hot insertion of the metallic item into the heat treatment device. Furthermore, the heat treatment device for hot insertion can be set up so that a metallic item, upon reaching a heating device, in particular the first heating device, has an average temperature of greater than or equal to 200 ° C, preferably greater than or equal to 250 ° C and particularly preferably greater than or equal to 300 ° C.

[0057] According to a particularly preferred embodiment, the heat treatment device can be configured so that a metallic material, upon reaching a heating device, in particular the first heating device, has an average temperature of greater than or equal to 600 ° C, preferably greater than or equal to 700 ° C and particularly preferably greater than or equal to 800 ° C. If the starting temperature of the metallic material is in one of the above orders of magnitude, it can also be referred to as direct use of the metallic material.

[0058] Particularly preferably, the heat treatment device can be configured to combine the above application scenarios "cold use" and / or "hot use" and / or "direct use". In this case, it is conceivable, among other things, for the heat treatment device to be arranged correspondingly to one or more casting machines and / or to a hot storage area for a metallic product and / or to a cold storage area for a metallic product. The heat treatment device can be used alternately or in any desired sequence with a metallic product of different temperatures. Thus, a heat treatment device can be configured to be operated in any desired sequence with metallic products of very different temperatures.

[0059] The mean temperature of a metallic material can be understood as a volume-averaged mean temperature of the metallic material.

[0060] In particular, the improvement of the energetic process efficiency of a heat treatment facility and / or the reduction of the carbon dioxide emissions released by a heat treatment facility through the use of carbon-free energy sources can advantageously be achieved by means of a heating device having a nominal power density in the metallic material of greater than or equal to 5 - 10 5 W / m 2 , preferably greater than or equal to 1 - 10 6 W / m 2 , can be achieved .

[0061] Heating devices with such a high nominal power density can be implemented with a compact length and thus a short throughput time, which is advantageous for energy efficiency, since the power required to increase the temperature can be transferred to the metallic material in a comparatively compact design. This can, in particular, advantageously influence the energy efficiency of the process, particularly by reducing heat losses. Furthermore, the heat treatment device proposed here can be designed to be more compact overall.

[0062] Heating devices with a correspondingly high nominal power density, particularly an inductor and / or a DFI module, physically require a limited direct penetration depth of heat beyond the surface of the metallic material. Thus, a temperature above the melting point of the material can be reached at the surface of the metallic material, while the core temperature of the metallic material can still be at room temperature. Over time, temperature differences can equalize, although heat is still released into the surroundings of the metallic material.

[0063] Here, a combination of a heating device with a high nominal power density and a homogenization device is proposed, wherein the homogenization device is designed to reduce temperature differences in the metallic material which have been caused by heating by means of the heating device with a high nominal power density.

[0064] The combination of heating device and homogenization device can advantageously enable energy-efficient and / or low-carbon heating of a metallic material to a high average temperature with small local temperature differences. The metallic material tempered in this way can advantageously be treated, in particular rolled, by the subsequent treatment device. In the course of modernizing existing heat treatment facilities having a heating device with a nominal power density of less than or equal to 1 - 10 5 W / m2 It is also planned to continue using an existing heating device as a homogenization device and to replace it with a modern heating device with a nominal power density of greater than or equal to 5 - 10 5 W / m 2 , preferably greater than or equal to 1 - 10 6 W / m 2 , advantageously performed first. This allows energy efficiency and / or carbon dioxide emissions to be improved and / or carbon dioxide emissions to be reduced through moderate intervention in the existing heat treatment facility.

[0065] According to an optional embodiment, the metallic material has a thickness of greater than or equal to 50 mm, preferably a thickness of greater than or equal to 150 mm and particularly preferably a thickness of greater than or equal to 200 mm.

[0066] In particular, the combination of heating device and homogenization device can have a particularly advantageous effect on the treatment of the metallic material from a thickness of greater than or equal to 20 mm, preferably from a thickness of greater than or equal to 35 mm, furthermore preferably from a thickness of greater than or equal to 50 mm and particularly preferably from a thickness of greater than or equal to 75 mm. Furthermore advantageously, the combination of heating device and homogenization device proposed here can have a particularly advantageous effect on the treatment of the metallic material from a thickness of greater than or equal to 100 mm, preferably from a thickness of greater than or equal to 135 mm, furthermore preferably from a thickness of greater than or equal to 180 mm and particularly preferably from a thickness of greater than or equal to 250 mm.

[0067] It is understood that the above-specified values ​​for the thickness of the metallic material may interact with the penetration depth of the heating device with high nominal power density and thus the need to homogenize temperature differences in the metallic material.

[0068] Optionally, the metallic material has a ratio of a width of the metallic material to a thickness of the metallic material of greater than or equal to 1.1, preferably of greater than or equal to 1.5, further preferably of greater than or equal to 5 and particularly preferably of greater than or equal to 10.

[0069] Furthermore, the metallic material preferably has a ratio of a width of the metallic material to a thickness of the metallic material of greater than or equal to 1.25, preferably of greater than or equal to 2.5, further preferably of greater than or equal to 8 and particularly preferably of greater than or equal to 16.

[0070] Heating devices with a comparatively high nominal power density benefit from a high ratio of the width of the metallic material to its thickness. In particular, with larger width-to-thickness ratios, a higher proportion of the cross-sectional area of ​​the metallic material can be reached via the direct penetration depth of the heat from the heating device with a high nominal power density, thereby reducing the effort required to homogenize temperature differences in the metallic material.

[0071] In contrast, heating devices with a low nominal power density, in particular classic furnaces having a gas burner, can benefit from a higher ratio of the surface area of ​​the metallic material to the volume of the metallic material, which can be achieved by a particularly small ratio of width to thickness of the metallic material.

[0072] According to an expedient embodiment, the metallic material has a ratio of a circumference of the metallic material to a cross-sectional area of ​​the metallic material of less than or equal to 3.25 1 / mm, preferably of less than or equal to 2.5 1 / mm, further preferably of less than or equal to 2.3 1 / mm and particularly preferably of less than or equal to 2.1 1 / mm.

[0073] According to a further expedient embodiment, the metallic material has a ratio of a circumference of the metallic material to a cross-sectional area of ​​the metallic material of less than or equal to 3 1 / mm, preferably of less than or equal to 2.75 1 / mm, further preferably of less than or equal to 2.4 1 / mm and particularly preferably of less than or equal to 2.2 1 / mm.

[0074] It has been shown that a small ratio of circumference to cross-sectional area is advantageous for tempering the metallic material with a heating device with a nominal power density of greater than or equal to 5-10 5 W / m 2 is, preferably greater than or equal to 1-10 6 W / m 2 , so that an energy-efficient and / or low-carbon dioxide emission heat treatment of the metallic material can be achieved with the heat treatment device proposed here.

[0075] Optionally, the conveying device is designed to convey the metallic material from the heating device towards the homogenizing device.

[0076] The conveying device is suitably designed to convey the metallic material from the homogenization device in the direction of the treatment device.

[0077] According to a preferred embodiment, the heat treatment device has at least two heating devices and at least two homogenization devices, in particular a first heating device, a first homogenization device, a second heating device and a second homogenization device, wherein the conveying device is set up to convey the metallic material from the first heating device in the direction of the first homogenization device, from the first homogenization device in the direction of the second heating device, from the second heating device in the direction of the second homogenization device and from the second homogenization device in the direction of the treatment device.

[0078] Furthermore, the heat treatment device preferably has at least three heating devices and at least three homogenization devices, in particular a first heating device, a first homogenization device, a second heating device, a second homogenization device, a third heating device and a third homogenization device, wherein the conveying device is set up to convey the metallic material from the first heating device in the direction of the first homogenization device, from the first homogenization device in the direction of the second heating device, from the second heating device in the direction of the second homogenization device, from the second homogenization device in the direction of the third heating device, from the third heating device in the direction of the third homogenization device and from the third homogenization device in the direction of the treatment device.

[0079] Optionally, the three heating devices and the three homogenizing devices can be arranged in blocks one behind the other and connected to each other by conveying devices.

[0080] It is understood that a heating device with a nominal power density of greater than or equal to 5 - 10 5 W / m 2 , preferably greater than or equal to 1 - 10 6 W / m 2, can only transfer enough power to the metallic material to prevent an edge of the metallic material and / or a surface of the metallic material from being melted. Particularly with greater absolute thicknesses of the material to be heated and / or high final temperatures and / or low temperatures when inserting the metallic material into the first heating device, the heating required for the treatment device may not be achieved with a first heating device without intermediate homogenization of the temperature differences.

[0081] With the cascade of heating devices and homogenization devices proposed here, the heating of the metallic material required for the treatment device can be advantageously achieved.

[0082] Furthermore, the heat treatment device preferably has a final stage heating device, in particular a final stage heating device with a nominal power density in the metallic material of greater than or equal to 5 - 10 5 W / m 2 , preferably greater than or equal to 1 - 10 6 W / m 2 , preferably greater than or equal to 5 - 10 6 W / m 2 and particularly preferably greater than or equal to 2 - IO 7 W / m 2 , wherein the conveying device is arranged to convey the metallic material from a homogenizing device in the direction of the final stage heating device and from the final stage heating device in the direction of the treatment device.

[0083] The following term is explained in this regard:

[0084] A "final stage heating device" is a heating device with a nominal power density of greater than or equal to 5 - 10 5 W / m 2understood, preferably greater than or equal to 1 - 10 6 W / m 2 , which is located directly in front of the treatment facility.

[0085] Some materials of metallic goods are preferably treated, especially rolled, at a higher average temperature. To increase flexibility for different materials, it is therefore proposed that the heat treatment device may have a final stage heating device that only reheats the materials at a specifically elevated optimal treatment temperature and does not have to influence other materials, although it can do so in advantageous cases.

[0086] To increase energy efficiency and / or reduce carbon dioxide emissions, it is therefore proposed to integrate the final stage heating device into the metallic material with a nominal power density of greater than or equal to 5-10 5 W / m 2to be executed, preferably greater than or equal to 1-10 6 W / m 2 , especially as a DFI module and / or as an inductor, since these designs can be used as needed without any preheating time.

[0087] Preferably, the power stage heating device has a nominal power density of greater than or equal to 9-10 5 W / m 2 preferably greater than or equal to 2 -IO 6 W / m 2 and particularly preferably greater than or equal to 3.5-10 6 W / m 2 . Furthermore, the output stage heating device preferably has a nominal power density of greater than or equal to 7 -IO 6 W / m 2 preferably greater than or equal to 8.5-10 6 W / m 2 and particularly preferably greater than or equal to 1-10 7 W / m 2 .

[0088] A power stage heating device may comprise a plurality of inductors, in particular two inductors, three inductors, four inductors, five inductors, or more than five inductors. A power stage heating device may comprise 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.

[0089] It is further proposed that a final-stage heating device be arranged downstream of the treatment device. In this way, the temperature of the metallic material can be increased further after treatment. Treatment by descaling is conceivable, among other things. The final-stage heating device is expediently configured to heat the metallic material to an average temperature of greater than or equal to 1,125 °C, preferably greater than or equal to 1,175 °C, and particularly preferably greater than or equal to 1,225 °C.

[0090] According to a particularly preferred embodiment, a heating device, in particular the first heating device and / or the second heating device and / or the final stage heating device, consists of an inductor and / or has at least one inductor.

[0091] Preferably, a heating device, in particular the first heating device and / or the second heating device and / or the final stage heating device, consists of a DFI module and / or has at least one DFI module.

[0092] According to an expedient embodiment, a heating device, in particular the first heating device and / or the second heating device and / or the final stage heating device, has a longitudinal extent of less than or equal to 1 length of the metallic material, preferably of less than or equal to 0.7 lengths of the metallic material and particularly preferably of less than or equal to 0.5 lengths of the metallic material.

[0093] Furthermore, a heating device expediently has a longitudinal extension of less than or equal to 0.85 lengths of the metallic material, preferably of less than or equal to 0.6 lengths of the metallic material and particularly preferably of less than or equal to 0.4 lengths of the metallic material.

[0094] Particularly preferably, a heating device, in particular the first heating device and / or the second heating device and / or the final stage heating device, has a longitudinal extent of greater than or equal to 0.2 lengths of the metallic material, preferably of greater than or equal to 0.3 lengths of the metallic material and particularly preferably of greater than or equal to 0.4 lengths of the metallic material.

[0095] Tests have shown that with the values ​​described above for the longitudinal extension of the heating device, a particularly economical heating of the metallic material can be achieved.

[0096] According to a particularly preferred embodiment, a homogenization device, in particular the first homogenization device and / or the second homogenization device, has a longitudinal extent in the conveying direction of less than or equal to 2.7 lengths of the metallic material, preferably of less than or equal to 2.6 lengths of the metallic material and particularly preferably of less than or equal to 2.5 lengths of the metallic material.

[0097] Tests have shown that with the values ​​described above for the longitudinal extension of the homogenization device a particularly economical homogenization of the metallic material can be achieved .

[0098] Advantageously, a homogenization device, in particular the first homogenization device and / or the second homogenization device, consists of an insulating heat-retaining device and / or has at least one insulating heat-retaining device.

[0099] Optionally, a homogenization device, in particular the first homogenization device and / or the second homogenization device, has at least one gas burner, in particular at least one gas burner in a jet pipe. Furthermore, optionally, a homogenization device, in particular the first homogenization device and / or the second homogenization device, has at least one electric heat radiator.

[0100] According to an optional embodiment, the treatment device comprises a pressure forming device for pressure forming the metallic material, in particular a rolling device for rolling the metallic material.

[0101] According to a further optional embodiment, the treatment device has a tensile forming device for tensile forming of the metallic material, in particular a stretching device for stretch-straightening the metallic material.

[0102] According to a second aspect of the invention, the object is achieved by a method for heating and treating a metallic material with a heat treatment device according to the first aspect of the invention, wherein a metallic material having an average temperature of less than or equal to 700 ° C is fed to the heat treatment device, preferably having an average temperature of less than or equal to 800 ° C and particularly preferably having an average temperature of less than or equal to 950 ° C.

[0103] In particular, a mixed use of the heat treatment device can be advantageously established, wherein a cold use and / or a hot use and / or a direct use can advantageously be combined with one another in a heat treatment device.

[0104] Suitably , a metallic material with an average temperature of less than or equal to 400 ° C is fed to the heat treatment device , preferably with an average temperature of less than or equal to 500 ° C and particularly preferably with an average

[0105] Temperature of less than or equal to 600 ° C. With the above temperature values, a hot charging process can be advantageously used and energy consumption and emissions can be reduced.

[0106] Optionally, a metallic material having an average temperature of less than or equal to 100 ° C is fed to the heat treatment device, preferably having an average temperature of less than or equal to 200 ° C and particularly preferably having an average temperature of less than or equal to 300 ° C.

[0107] In this way, the heat treatment device can also be used advantageously for cold applications.

[0108] It is particularly advantageous if a metallic material having an average temperature of greater than or equal to 600 ° C is fed to the heat treatment device, preferably having an average temperature of greater than or equal to 700 ° C and particularly preferably having an average temperature of greater than or equal to 800 ° C.

[0109] This makes it possible to advantageously implement a particularly energy-efficient direct feed process, particularly directly from a continuous casting plant, so that carbon dioxide emissions can be saved.

[0110] It should be expressly pointed out that the subject matter of the second aspect can be advantageously combined with the subject matter of the preceding aspect of the invention, both individually or cumulatively in any combination.

[0111] According to a third aspect of the invention, the object is achieved by using a heat treatment device according to the first aspect of the invention and / or a method according to the second aspect of the invention. It is understood that the advantages of a heat treatment device according to the first aspect of the invention and / or a method according to the second aspect of the invention extend directly to using a heat treatment device according to the first aspect of the invention and / or a method according to the second aspect of the invention.

[0112] It should be expressly pointed out that the subject matter of the third aspect can be advantageously combined with the subject matters of the preceding aspects of the invention, both individually or cumulatively in any combination.

[0113] Further advantages, details and features of the invention will become apparent from the following exemplary embodiments. These show in detail:

[0114] Figure 1: schematically shows a sectional view of a metallic material with an inhomogeneous temperature distribution in the cross section;

[0115] Figure 2: schematically shows a first embodiment of a heat treatment device and an associated temperature profile of the average temperature of a metallic material in the heat treatment device;

[0116] Figure 3: schematically shows a second embodiment of a heat treatment device and an associated temperature profile of the average temperature of a metallic material in the heat treatment device; and

[0117] Figure 4: schematically shows a third embodiment of a heat treatment device and an associated temperature profile of the average temperature of a metallic material in the heat treatment device. In the following description, the same reference symbols denote the same components or the same features, so that a description given with reference to one figure regarding a component also applies to the other figures, thus avoiding repetitive description. Furthermore, individual features that were described in connection with one embodiment can also be used separately in other embodiments.

[0118] Figure 1 shows a schematic sectional view of a metallic material 10 with an inhomogeneous temperature profile along a cross section of the metallic material 10. The core temperature T K of the metallic material can be greater or less than the surface temperature T oof the metallic material. The temperature profile from the core temperature can range over a number of temperatures Ti to the surface temperature T o get lost .

[0119] A first embodiment of a heat treatment device 20 according to Figure 2 essentially consists of a heating device 30, a homogenization device 40, a conveying device 60 and a treatment device 50. The conveying device 60 can convey the metallic material 10 from the heating device 30 in the direction of the treatment device 50. In the first embodiment described here, the metallic material 10 is transferred directly from the heating device 30 to the homogenization device 40. Optionally, the first embodiment described here could also be modified such that the metallic material 10 is forwarded from the heating device 30 to the homogenization device 40 by means of a further conveying device (not shown).

[0120] An average temperature of a metallic material 10 in the heat treatment device 20 is in the area of ​​the heating device 30 from an average starting temperature T st of the metallic material 10 is increased to a first average temperature TI of the metallic material 10 and homogenized in the region of the homogenization device 40. The metallic material 10 is conveyed by the conveying device 60 to the treatment device 50, in particular at the first average temperature TI.

[0121] A second embodiment of a heat treatment device 20 according to Figure 3 essentially consists of a first heating device 31, a first homogenization device 41, a second heating device 32, a second homogenization device 42, a final stage heating device 70, a conveying device 60 and a treatment device 50. The heat treatment device can have any number of further n-th heating devices 33 and n-th homogenization devices 43 after the second homogenization device 42 and before the final stage heating device 70, wherein an n-th heating device 33 is always followed by an n-th homogenization device 43. The conveying device 60 can convey the metallic material 10 from the first heating device 31 in the direction of the treatment device 50.

[0122] In the second embodiment described here, the metallic material 10 is transferred directly from the first heating device 31 to the first homogenization device 41. Furthermore, the metallic material 10 is transferred from the first homogenization device 41 directly to the second heating device 32 and from there directly to the second homogenization device 42. At least indirectly, the metallic material is transferred from the second homogenization device 42 to the nth heating device 33 and from there directly to the nth homogenization device 43 and subsequently directly to the final stage heating device 70.It is understood that the second embodiment described here can also be modified in such a way that a conveying device (not shown) can be arranged between a heating device (30, 31, 32, 33, 70) and a homogenizing device (40, 41, 42, 43), which is designed to convey the metallic material 10 to the respective subsequent device (41, 32, 42, 33, 43, 70). Due to the residence time of the metallic material 10 on the conveying device, a heat flow can be released from the metallic material onto a roller of a conveying device and / or the surroundings of the metallic material 10. However, this does not lead to complete homogenization; rather, the metallic material can cool down in the edge regions as a result. The homogenization of the average temperature therefore takes place in the respective downstream homogenization device ( 40 , 41 , 42 , 43 ) .

[0123] An average temperature of a metallic material 10 in the heat treatment device 20 is in the area of ​​the first heating device 31 from an average starting temperature T st of the metallic material 10 is increased to a first average temperature TI of the metallic material 10 and homogenized in the region of the first homogenization device 41. The average temperature of the metallic material 10 is increased in the region of the second heating device 32 from a first average temperature TI to a second average temperature T2 of the metallic material 10 and homogenized by a second homogenization device 42. The average temperature of the metallic material 10 is increased from a second average temperature T2 in the region of the final stage heating device 70 to an average final temperature T End The metallic material 10 is conveyed by the conveying device 60 to the treatment device 50, in particular with the mean final temperature T End .

[0124] Alternatively, the average temperature of the metallic material 10 can be reduced from the second average temperature T2 in the region of an n-th heating device 33 to an n-th average temperature T n of the metallic material 10 and homogenized in the area of ​​an n-th homogenization device 43. The average temperature of the metallic material 10 can be increased from an n-th average temperature T n in the area of ​​the final stage heating device 70 to a mean final temperature T End The metallic material 10 is conveyed by the conveying device 60 to the treatment device 50, in particular with the mean final temperature T End .

[0125] A third embodiment of a heat treatment device 20 according to Figure 4 essentially consists of a first heating device 31, a second heating device 32, a first conveying device 61, a first homogenizing device 41, a third heating device 33, a first heat treatment device 50, a further conveying device 60, a final stage heating device 70, a second treatment device 51 and a conveying device 60. The heat treatment devices 50, 51 can have any desired number of further n-th heating devices (not shown) and n-th homogenizing devices (not shown), wherein a first heat treatment device 50 is always preceded by at least one heating device 31, 32, 33, at least one homogenizing device 41 and a first conveying device 61.The first conveyor device 61 can convey the metallic material 10 from the first heating device 31 toward the treatment device 50. It can be divided into several individual length segments arranged between the devices. List of reference symbols.

[0126] 10 metallic goods

[0127] 20 Heat treatment facility

[0128] 30 Heating device

[0129] 31 first heating device

[0130] 32 second heating device

[0131] 33 n-th heating device; third heating device

[0132] 40 homogenization device

[0133] 41 first homogenization device

[0134] 42 second homogenization device

[0135] 43 n-th homogenization device

[0136] 50 treatment facilities

[0137] 51 treatment facility

[0138] 60 conveyor system

[0139] 61 first funding institution

[0140] 65 conveyor length

[0141] 70 Power stage heating device

[0142] T K Core temperature of the metallic material

[0143] T o Surface temperature of the metallic material

[0144] Ti internal temperature at point i of the metallic material

[0145] T st Average starting temperature of a metallic material

[0146] TI First average temperature of a metallic material

[0147] T2 Second mean temperature of a metallic good

[0148] T3 Third mean temperature of a metallic good

[0149] T n n-th mean temperature of a metallic material

[0150] T end Mean final temperature of a metallic material

Claims

Patent claims 1. Heat treatment device (20) for heating and treating a metallic material (10), comprising: a heating device (30) with a nominal power density in the metallic material (10) of greater than or equal to 5-10 5 W / m 2 , preferably greater than or equal to 1-10 6 W / m 2 , preferably greater than or equal to 5-10 6 W / m 2 and particularly preferably greater than or equal to 2 -IO 7 W / m 2 , in particular a first heating device (31); a homogenization device (40), in particular a first homogenization device (41), wherein the homogenization device (40) is designed to reduce a temperature difference between a surface temperature (T o ) of the metallic material (10) and a core temperature (T K) of the metallic material (10) is set to less than or equal to 50 °C, preferably less than or equal to 20 °C and particularly preferably less than or equal to 10 °C; a treatment device (50, 51) for treating the metallic material (10); and a conveying device (60, 61) for conveying the metallic material (10) from the heating device (30) in the direction of the treatment device (50, 51).

2. Heat treatment device (20) according to claim 1, characterized in that the metallic material (10) has a thickness of greater than or equal to 50 mm, preferably a thickness of greater than or equal to 150 mm and particularly preferably a thickness of greater than or equal to 200 mm.

3. Heat treatment device (20) according to one of claims 1 or 2, characterized in that the metallic material (10) has a ratio of a width of the metallic material (10) to a thickness of the metallic material (10) of greater than or equal to 1.1, preferably of greater than or equal to 1.5, furthermore preferably greater than or equal to 5 and particularly preferably greater than or equal to 10.

4. Heat treatment device (20) according to one of the preceding claims, characterized in that the metallic material (10) has a ratio of a circumference of the metallic material (10) to a cross-sectional area of ​​the metallic material (10) of less than or equal to 3.25 1 / mm, preferably of less than or equal to 2.5 1 / mm, further preferably of less than or equal to 2.3 1 / mm and particularly preferably of less than or equal to 2.1 1 / mm.

5. Heat treatment device (20) according to one of the preceding claims, characterized in that the conveying device (60, 61) is designed to convey the metallic material (10) from the heating device (30) in the direction of the homogenizing device.

6. Heat treatment device (20) according to one of the preceding claims, characterized in that the conveying device (60, 61) is designed to convey the metallic material (10) from the homogenizing device in the direction of the treatment device (50, 51).

7. Heat treatment device (20) according to one of the preceding claims, characterized in that the heat treatment device (20) has at least two heating devices (30) and at least two homogenization devices, in particular a first heating device (31), a first homogenization device (41), a second heating device (32) and a second homogenization device (42); and wherein the conveying device (60, 61) for conveying the metallic material (10) from the first heating device (31) in the direction of the first homogenization device (41), from the first homogenization device (41) in the direction of the second heating device (32), from the second heating device (32) in the direction of the second homogenization device (42) and from the second homogenization device (42) in the direction of the treatment device (50, 51).

8. Heat treatment device (20) according to one of the preceding claims, characterized in that the heat treatment device (20) has a final stage heating device (70), in particular a final stage heating device (70) with a nominal power density into the metallic material (10) of greater than or equal to 5-10 5 W / m 2 , preferably greater than or equal to 1-10 6 W / m 2 , preferably greater than or equal to 5-10 6 W / m 2 and particularly preferably greater than or equal to 2 -IO 7 W / m 2 ; and wherein the conveying device (60, 61) is arranged to convey the metallic material (10) from a homogenizing device in the direction of the final stage heating device (70) and from the final stage heating device (70) in the direction of the treatment device (50, 51).

9. Heat treatment device (20) according to claim 8, characterized in that the final stage heating device (70) is designed to heat the metallic material (10) to an average temperature of greater than or equal to 1,125 °C, preferably greater than or equal to 1,175 °C and particularly preferably greater than or equal to 1,225 °C.

10. Heat treatment device (20) according to one of the preceding claims, characterized in that a heating device (30), in particular the first heating device and / or the second heating device and / or the final stage heating device (70), consists of an inductor and / or has at least one inductor.

11. Heat treatment device (20) according to one of the preceding claims, characterized in that a heating device (30), in particular the first heating device and / or the second heating device and / or the final stage heating device (70), consists of a DFI module and / or has at least one DFI module.

12. Heat treatment device (20) according to one of the preceding claims, characterized in that a heating device (30), in particular the first heating device and / or the second heating device and / or the final stage heating device (70), has a longitudinal extent of less than or equal to 1 length of the metallic material (10), preferably of less than or equal to 0.7 lengths of the metallic material (10) and particularly preferably of less than or equal to 0.5 lengths of the metallic material (10).

13. Heat treatment device (20) according to one of the preceding claims, characterized in that a heating device (30), in particular the first heating device and / or the second heating device and / or the final stage heating device (70), has a longitudinal extent of greater than or equal to 0.2 length of the metallic material (10), preferably of greater than or equal to 0.3 lengths of the metallic material (10) and particularly preferably of greater than or equal to 0.4 lengths of the metallic material (10).

14. Heat treatment device (20) according to one of the preceding claims, characterized in that a homogenization device, in particular the first homogenization device and / or the second homogenization device, has a longitudinal extent in the conveying direction of less than or equal to 2.7 lengths of the metallic material (10), preferably of less than or equal to 2.6 lengths of the metallic material (10) and particularly preferably of less than or equal to 2.5 lengths of the metallic material (10).

15. Heat treatment device (20) according to one of the preceding claims, characterized in that a homogenization device, in particular the first homogenization device and / or the second homogenization device, consists of an insulating heat-holding device and / or has at least one insulating heat-holding device.

16. Heat treatment device (20) according to one of the preceding claims, characterized in that a homogenization device, in particular the first homogenization device and / or the second homogenization device, has at least one gas burner, in particular at least one gas burner in a jet pipe.

17. Heat treatment device (20) according to one of the preceding claims, characterized in that a homogenization device, in particular the first homogenization device and / or the second homogenization device, has at least one electric heat radiator.

18. Heat treatment device (20) according to one of the preceding claims, characterized in that the treatment device (50, 51) has a pressure forming device for pressure forming the metallic material (10), in particular a rolling device for rolling the metallic material (10).

19. Heat treatment device (20) according to one of the preceding claims, characterized in that the treatment device (50, 51) has a tensile forming device for tensile forming the metallic material (10), in particular a stretching device for stretch-straightening the metallic material (10).

20. Method for heating and treating a metallic Material (10) with a heat treatment device (20) according to one of claims 1 to 19, wherein a metallic material (10) having an average temperature of less than or equal to 700 °C is supplied to the heat treatment device (20), preferably having an average temperature of less than or equal to 800 °C and particularly preferably having an average temperature of less than or equal to 950 °C.

21. Method according to claim 20, characterized in that a metallic material (10) with an average temperature of less than or equal to 400 °C is supplied to the heat treatment device (20), preferably with an average temperature of less than or equal to 500 °C and particularly preferably with an average temperature of less than or equal to 600 °C.

22. Method according to one of claims 20 or 21, characterized in that a metallic material (10) with an average temperature of less than or equal to 100 °C is supplied to the heat treatment device (20), preferably with an average temperature of less than or equal to 200 °C and particularly preferably with an average temperature of less than or equal to 300 °C.

23. Method according to one of claims 20 to 22, characterized in that a metallic material (10) with an average temperature of greater than or equal to 600 °C is supplied to the heat treatment device (20), preferably with an average temperature of greater than or equal to 700 °C and particularly preferably with an average temperature of greater than or equal to 800 °C.

24. Use of a heat treatment device (20) according to one of claims 1 to 19 and / or a method according to one of claims 20 to 23.

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