EP4214010B1 - Method and spraying apparatus for thermal surface treatment of a metal product - Google Patents

Method and spraying apparatus for thermal surface treatment of a metal product Download PDF

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Publication number
EP4214010B1
EP4214010B1 EP21772737.9A EP21772737A EP4214010B1 EP 4214010 B1 EP4214010 B1 EP 4214010B1 EP 21772737 A EP21772737 A EP 21772737A EP 4214010 B1 EP4214010 B1 EP 4214010B1
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EP
European Patent Office
Prior art keywords
metallic product
cooling nozzles
group
spray device
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21772737.9A
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German (de)
French (fr)
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EP4214010A1 (en
Inventor
Dirk Letzel
Uwe Plociennik
Volker Mers
Axel Stavenow
Ina HÜLLEN
Harminder Singh
Ingo OLGEMÖLLER
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP4214010A1 publication Critical patent/EP4214010A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1243—Accessories for subsequent treating or working cast stock in situ for cooling by using cooling grids or cooling plates

Definitions

  • the invention relates to a method for the thermal surface treatment of a metallic product according to the preamble of claim 1, and a spray device provided for this purpose according to the preamble of claims 21, 22 and 27.
  • a steel product treated in this way has increased strength and toughness with a preferred structure including a significant proportion of fine-grained bainite.
  • Further processes and devices for thermal surface treatment of a metallic product are also from the documents WO 00/03042 A1 , EP 3 184 202 A1 and WO 2012/069234 A1 known.
  • the invention is based on the object of optimizing the production of a metallic product with regard to its thermal surface treatment in order to be able to influence a resulting material or microstructure of the metallic product.
  • the invention provides a method for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, in which the metallic product is moved in a transport direction through a treatment section of a spray device equipped with cooling nozzles and cooling fluid is passed through the cooling nozzles of the spray device is applied to the surfaces of the metallic product.
  • the metallic product has - viewed in the transport direction of the metallic product - a front section and a trailing rear section. When performing this process, the rear portion of the metallic product is cooled more than the front portion of the metallic product.
  • the cooling nozzles are arranged at least in a first group and in a second group. It is provided here that the second group of cooling nozzles - viewed in the transport direction of the metallic product - is arranged downstream of the first group of cooling nozzles.
  • the cooling nozzles are connected to at least one frequency-controlled pump for supplying cooling fluid, with which the cooling fluid is conveyed to the cooling nozzles with a predetermined amount and a predetermined pressure. It can be provided here that separate frequency-controlled pumps are provided for the first group of cooling nozzles and for the second group of cooling nozzles.
  • the first and second groups of cooling nozzles are fed with cooling fluid by only one central frequency-controlled pump, with at least one control valve being provided in a line between the frequency-controlled pump and the cooling nozzles of the first and second groups, respectively in which a targeted amount of water and/or a predetermined pressure can be set for the cooling nozzles of the first or second group in relation to the cooling fluid.
  • the present invention also provides a spray device for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, comprising a treatment section with an inlet area and an outlet area, the metallic product being sprayed along the treatment section from the inlet area in the direction of the outlet area can be moved in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product.
  • the cooling nozzles are arranged at least in a first group and in a second group, with the second group of cooling nozzles - seen in the transport direction of the metallic product - downstream of the first group Cooling nozzles are arranged.
  • the cooling nozzles of the first group and the cooling nozzles of the second group are each connected to separate frequency-controlled pumps. With these respective frequency-controlled pumps, a predetermined quantity and/or a predetermined pressure for the cooling nozzles of the first group or for the cooling nozzles of the second group can be set, preferably regulated, with respect to the cooling fluid.
  • An alternative embodiment of the invention which has an independent meaning, provides a spray device for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, comprising a treatment section with an inlet area and an outlet area, the metallic product being sprayed along the treatment section which can be moved in the direction of the outlet area in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product.
  • the cooling nozzles are arranged at least in a first group and in a second group, with the second group of cooling nozzles - viewed in the transport direction of the metallic product - being arranged downstream of the first group of cooling nozzles.
  • the cooling nozzles of the first group and the cooling nozzles of the second group are connected to at least one frequency-controlled pump, with at least one control valve being provided in a line between the frequency-controlled pump and the cooling nozzles of the first and second groups, with which the cooling fluid is connected a quantity of water and/or a pressure for the cooling nozzles of the first or second group is adjustable, preferably controllable.
  • a control device is provided with which the frequency-controlled pump, or the frequency-controlled pumps, and / or the control valve is or are in signal connection.
  • process parameters of the metallic product may include the temperature upstream and/or downstream of the spray device, the temperature at the top and/or bottom, and/or a ferrite content that was measured downstream of the spray device.
  • the invention is based on the essential finding that the metallic product, which can be a continuous or endless casting strand or an isolated slab formed from it, is cooled unevenly with respect to its longitudinal extent. Specifically, in the method according to the invention, this occurs in such a way that the rear section of the metallic product - viewed in the transport direction of the metallic product - is cooled more strongly than its front section, with the result that in between the front and rear sections of the Metallic product extending length range of the metallic product a targeted microstructure is achieved, namely an essentially uniform ferrite proportion.
  • the cooling nozzles are arranged at least in a first group and in a second group, whereby these groups of cooling nozzles - seen in the transport direction of the metallic product - can each be fed with different amounts of cooling fluid.
  • This is achieved either by a suitable control of the separate frequency-controlled pumps to which the cooling nozzles of the respective first and second groups are connected, or by a suitable control of the at least one control valve, which is in a line between the frequency-controlled pump and the cooling nozzles of the first or second group is provided.
  • a further aim is that the energy content of the metallic product with regard to a further Processing following thermal surface treatment is as large as possible.
  • the metallic product is only cooled to the extent required for the desired constant structural transformation, thereby maintaining the uniform ferrite content in the material of the metallic product at a predetermined depth thereof, for example 5-10 mm, over one to achieve a length range extending between the front section and the rear section of the metallic product.
  • a plurality of cooling nozzles are arranged in the treatment section of the spray device above the metallic product and/or below the metallic product along the transport direction of the metallic product.
  • a cooling fluid is sprayed under pressure from these cooling nozzles onto the surfaces of the metallic product.
  • This cooling fluid is expediently used in the form of water or based on water.
  • the amount and / or the pressure for the cooling fluid for the cooling nozzles of the first Group are set larger than for the cooling nozzles in the second group.
  • Such a supply of the cooling nozzles of the first group of cooling nozzles with a larger amount of cooling fluid and/or a greater pressure than in comparison to the second group of cooling nozzles is expediently set for the cooling nozzles both on the top and on the bottom of the metallic product.
  • the temperature of the metallic product is measured. This can be done - viewed in the transport direction of the metallic product - upstream and/or downstream of the spray device. Furthermore, the can Temperature of the metallic product can be measured at its top and/or bottom. In any case, the temperature measurement for the metallic product is carried out for the purpose of adjusting or regulating the amount of cooling fluid that is applied from the cooling nozzles of the spray device onto the surfaces of the metallic product depending on this measured temperature of the metallic product.
  • the transport speed of a metallic product in the form of a separated slab, or the change in this transport speed for the slab within the treatment section of the spray device can also be adjusted or regulated.
  • the transport speed at which an isolated slab is guided past the cooling nozzles provided therein in the treatment section of the spray device or by specifically changing them, it can be achieved that the front section of the slab is guided past these cooling nozzles faster than the rear section of the slab, with the result that - as explained - the rear section of the slab is then cooled more strongly.
  • Another possibility for a targeted influence on the cooling of the metallic product is that - viewed in the transport direction of the metallic product - the surface quality of the metallic product is measured downstream of the spraying device in relation to the proportion of ferrite.
  • the cooling nozzles are arranged along the treatment section of the spray device on both sides of the metallic product, i.e. above and below it, it is expedient that the amount of water and / or the pressure for the cooling nozzles is below metallic product are chosen to be larger than for the cooling nozzles, which are arranged above the metallic product.
  • This can be achieved by supplying the cooling nozzles, which are arranged on the bottom of the metallic product, with cooling fluid from their own frequency-controlled pump, which means that the cooling nozzles, which are arranged on the top of the metallic product, are supplied by a separate one Frequency-controlled pump can be fed with cooling fluid.
  • the different supply of the cooling nozzles on the underside of the metallic product compared to the cooling nozzles on the top of the metallic product is achieved in that the cooling nozzles, which are arranged below and above the metallic product, are each supplied to different frequency-controlled pumps connected with cooling fluid.
  • the thickness of the metallic product for which the characteristic thermal surface treatment is implemented is at least 250 mm and/or that a width of the metallic product is at least 3000 mm.
  • the cooling fluid is intermittently applied from the cooling nozzles to the surfaces of the metallic product. This leads to the advantage that a controlled local heat removal can be achieved by means of intensive water cooling, for example at a specific point on the metallic product in relation to its longitudinal extent.
  • a spray device for the thermal surface treatment of a metallic product in the form of a separated slab comprising a treatment section with an inlet area and an outlet area, the metallic product being moved along the treatment section on a roller table of the inlet area can be moved towards the outlet area in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product.
  • At least one roller element of the roller table is equipped with a motor drive.
  • the roller element equipped with the motor drive can be arranged adjacent to the treatment section.
  • a control device is provided with which the motor drive of the roller element is in signal connection, namely such that the speed or the peripheral speed of the roller element depends on at least one process parameter of the metallic Product or the isolated slab can be controlled and preferably regulated.
  • the at least one process parameter of the metallic product can be selected from the group consisting of temperature, ferrite content in the material of the metallic Product and/or geometry of the metallic product, in particular in relation to its cross section perpendicular to the transport direction.
  • the present invention creates a technology for targeted thermal surface treatment that enables automated adjustment of the temperature for a metallic product and its resulting metal structure. For example, the targeted delivery of a larger amount of cooling fluid through the cooling nozzles of the first group than through the cooling nozzles of the second group causes the rear section of the metallic product to undergo locally controlled, more intensive cooling than the front section of the metallic product.
  • the present invention makes it possible to influence the surface quality and structure of a steel casting strand produced on a vertical, vertical bend (i.e. system with a vertical area), a horizontal or curved continuous casting system (without a vertical area), in particular a casting strand of any product format.
  • a spray device 10 and a corresponding method for thermal surface treatment of a metallic product according to the present invention are shown and explained in order to achieve a targeted structural transformation or a desired structure, namely a substantially uniform ferrite content, for the metallic product.
  • the same features in the drawing are each provided with the same reference numbers. At this point it should be noted that the drawing is simply simplified and, in particular, shown without a scale.
  • Fig. 1 basically shows a simplified side view of a continuous casting system 100, which is equipped with the spray device 10.
  • the continuous casting system 100 includes Fig. 1 a mold that has a lower opening and thereby a vertical outlet downwards.
  • the mold is filled with liquid metal up to a level or liquid metal, for example steel or a steel alloy.
  • a metallic product 1 emerges through the lower opening of the mold in the form of a casting strand 2, which then runs through a supporting strand guide and is thereby transferred to the horizontal.
  • the continuous casting system 100 comprises a roller table 8 with a plurality of roller elements 9, on which the casting strand 2 is moved further in the transport direction T after it has been transferred to the horizontal.
  • a continuous casting plant 100 can be a thick slab plant with which a casting strand 2 with a thickness of preferably 250 mm, or possibly even larger casting thicknesses, can be produced.
  • the spray device 10 according to the invention is arranged in a part of the continuous casting system 100 in which the casting strand 2 has already been transferred to the horizontal.
  • This spray device 10 is used for the thermal surface treatment of the casting strand 2 and for this purpose is equipped with a plurality of cooling nozzles 16 which are provided in a treatment section 12 of the spray device 10.
  • the spray device 10 comprises a housing G.
  • an inlet region 14 is formed for the casting strand 2
  • an outlet area 15 is formed in a front region of this - seen in the transport direction T of the casting strand 2 - rear region of the housing G.
  • temperature measuring devices 13 Adjacent to the inlet area 14 and the outlet area 15, temperature measuring devices 13 are provided within the housing G, with which the Temperature of the casting strand 2 can be determined both when entering the housing G and when leaving the housing G. These temperature measuring devices 13 can each be arranged above and below the casting strand 2 or the roller table 8, on which the casting strand 2 is also moved in the transport direction T within the treatment section 12 of the spray device 10.
  • the metallic product 1 if it is within the treatment section 12 the spray device 10, has a front section 4 - seen in the transport direction T of the casting strand 2 - with which the metallic product 1 enters the treatment section 12.
  • the metallic product has a rear section 5 - seen in the transport direction T of the casting strand 2 - which lags behind the front section 4 or - again seen in the transport direction T of the casting strand 2 - is located upstream of the front section 4 .
  • the individual cooling nozzles 16 are combined into at least two groups within the treatment section 12 of the spray device 10, namely in a first group 16.1 and in a second group 16.2.
  • the second group 16.2 of the cooling nozzles 16 - seen in the transport direction T of the casting strand 2 - is arranged downstream of the first group 16.1 of the cooling nozzles 16.
  • Both the first group 16.1 and the second group 16.2 each contain cooling nozzles 16, which are arranged both on the top 6 of the casting strand 2 and on its underside 7.
  • the top 6 and the bottom 7 of the casting strand are, for example, in the Fig. 2 and Fig. 3 referred to as such.
  • the continuous casting system 100 comprises a separating device in the form of scissors S, which - seen in the transport direction T of the casting strand 2 - is arranged upstream of the spray device 10.
  • a cleaning device 22 for example in the form of a descaler, is also arranged upstream of the spray device 10.
  • FIG Fig. 2 A first embodiment for the spray device 10 according to the invention is shown in FIG Fig. 2 shown.
  • separate frequency-controlled pumps 18 are provided, with which the cooling nozzles 16 on the one hand of the first group 16.1 and on the other hand of the second group 16.2 are supplied with cooling fluid separately.
  • the cooling nozzles 16 of the first group 16.1 and the second group 16.2 are each connected via a line 17 to the frequency-controlled pump 18 assigned to them.
  • the two frequency-controlled pumps 18 are connected to a control device 20 for signaling purposes. Both of these pumps 18 are connected by unspecified lines to a tank or the like in which cooling fluid is contained. Operation of these pumps 20 can thus be suitably controlled or regulated by the control device 20 in order to thereby supply the cooling nozzles 16 of both the first group 16.1 and the second group 16.2 with cooling fluid.
  • control valves 19 are provided, which are also connected to the control device in terms of signaling 20 are connected and can thereby be actuated.
  • a suitable operating position of these control valves 19 can be used to control whether cooling fluid is applied to the surfaces of the casting strand 2 or not.
  • Fig. 3 shows a second embodiment for the spray device 10 according to the invention.
  • the cooling nozzles 16 of both the first group 16.1 and the second group 16.2 are now connected to a common frequency-controlled pump 18 for the purpose of supplying cooling fluid.
  • a control valve 19 which is provided in a line 17 between the frequency-controlled pump 18 and the two groups 16.1 and 16.2 of the cooling nozzles 16, it is possible to adjust the amount and at what pressure the cooling fluid is supplied to the cooling nozzles 16 of the first group 16.1 and is fed to the second group 16.2.
  • the frequency-controlled pump 18 and the control valve 17 are each controlled or regulated by the control device 20.
  • At least one roller element 9 of the roller table 8 is equipped with a motor drive M. Accordingly, this driven roller element is shown in the illustrations Fig. 2 and Fig. 3 each labeled "9(M)".
  • This driven roller element 9 (M) is also in signal connection with the control device 20, as shown, for example, in the Fig. 3 is symbolized by the dotted line and can be controlled accordingly by means of the control device 20.
  • a metallic product 1 is first produced in the form of a casting strand 2, which, after leaving the mold, first passes through the supporting strand guide and, after being transferred to the horizontal on the roller table 8, is moved further in the transport direction T. It can be provided here that the surfaces of the casting strand 2 are cleaned by means of the cleaning device 22, for example by applying water under high pressure.
  • the metallic product 1 also passes through the treatment section 12 of the spray device 10.
  • a thermal surface treatment for the metallic product 1 is carried out in that cooling fluid 16 is directed onto the surfaces through the cooling nozzles of the first group 16.1 and the second group 16.2 of the metallic product 1 is applied.
  • the metallic product 1 can be a casting strand 2 that has not yet been separated and accordingly represents an endless profile. This is in the representation of Fig. 4 illustrated, in which such an endless casting strand 2 is moved on the roller table 8 in the transport direction T.
  • the thermal surface treatment of the casting strand 2 within the treatment section 12 of the spray device 10 can be carried out in such a way that cooling fluid is applied to the surfaces of the casting strand 2 from the cooling nozzles 16 of the first group 16.1 with a larger amount and/or a greater pressure than in the comparison from the Cooling nozzles 16 of the second group 16.2.
  • This then has the consequence that the trailing rear section 5 of the casting strand 2 within the treatment section 12 of the spray device 10 is cooled more strongly than its front section 4.
  • This cooling strategy the result is achieved that in the material of the casting strand 2 at a predetermined depth of this, over a length range that extends between the front section 4 and the rear section 5, a substantially uniform ferrite proportion is established.
  • thermal surface treatment is also possible for an isolated slab 3, which has previously been formed from the casting strand 2, within the treatment section 12 of the spray device 10.
  • the casting strand 2 is separated by means of the scissors S before it reaches the spray device 10 on the roller table 8, so that a correspondingly separated slab 3 then enters the treatment section 12 of the spray device 10 or its housing G.
  • Moving the separated slab 3 within the treatment section 12 of the spraying device 10 in the transport direction T can be achieved by the driven roller element 9 (M). This is, for example, in the representation of Fig. 5 illustrated.
  • this cooling strategy can be achieved by moving the isolated slab 3 into the treatment section 12 of the spray device 10 or into its housing G in such a way that the front section 4 of the slab 3 passes the cooling nozzles 16 faster than the trailing one rear section 5 of the slab 5. This can be achieved with a suitable control of the driven roller element 9 (M) by the control device 20.
  • Fig. 6 shows a simplified perspective view of a quick-change frame 24 in which a group of cooling nozzles 16 are arranged.
  • a line 17 for cooling fluid leads laterally into such a quick-change frame 24 and is connected to spray pipes to which the individual cooling nozzles 16 are attached.
  • the line 17 is connected to a frequency-controlled pump 18 in order to thereby supply the cooling nozzles 16 with cooling fluid.
  • Fig. 6 clarifies that the quick-change frame 24 is designed in cross section in the form of a rectangular profile that encloses a central opening.
  • the roller table 8, which is in the for simplification Fig. 6 is not shown, extends through this central opening.
  • the top 6 and the bottom 7 of the metallic product 1 can be supplied with cooling fluid when this cooling fluid is discharged through the cooling nozzles 16 in the direction of the metallic product 1.
  • the quick-change frame 24 is equipped with a height adjustment device H.
  • This height adjustment device H acts on the spray pipes, which are arranged above the roller table 8. Accordingly, by activating this height adjustment device H, it is possible to change the distance between the cooling nozzles 16, which are arranged above the metallic product 1, relative to the top side 6 of the metallic product 1.
  • Fig. 7 shows a perspective view of the spray device 10 according to a further embodiment, in which - seen in the transport direction T of the metallic product - a total of three groups of cooling nozzles 16 are arranged.
  • a third group 16.3 of cooling nozzles 16 is now also provided, which - viewed in the transport direction T of the metallic product - is arranged downstream of the second group 16.2.
  • a quick-change frame 24 is also required for this purpose Fig. 6 can be used to arrange the cooling nozzles 16 above and below the metallic product 1.
  • cooling fluid is discharged from the cooling nozzles 16 of the third group 16.3 with a smaller amount and/or a smaller pressure than from the cooling nozzles 16 of the second group 16.2 .
  • the amount of cooling fluid discharged from the cooling nozzles 16 and/or its pressure for the three groups 16.1, 16.2 and 16.3, in this order are continuously reduced along the transport direction T.
  • cooling nozzles 16 of the second group 16.2 are then located approximately in an area between the front section 4 and the rear section 5 of the metallic product 1.
  • the quick-change frames 24 are positioned along the roller table 8 in such a way that they are integrated into the housing G of the spray device 10 and thereby a closed housing chamber K is formed at least in the area of the treatment section 12 of the spray device 10.
  • a cover is provided, which is shown in the illustration Fig. 7 marked with the designation “D”.
  • the inlet area 14 and the outlet area 15 of the housing chamber K are each equipped with a lock function in order to prevent the metallic product 1 from entering into the housing chamber K or the metallic product 1 from running out out of the housing chamber K to ensure.
  • the housing G can be equipped with a water vapor suction direction (not shown). It is therefore possible that water vapor, which can form within the closed housing chamber K when a metallic product 1 is inside the treatment section 12 of the Spray device 10 is subjected to a thermal surface treatment, is suctioned off suitably by means of this water vapor suction direction.
  • a defined heat removal for the metallic product 1 can be achieved using an adjustable amount of water.
  • this can also be achieved by means of an adjustable transport speed with which the slab 3 is moved into the treatment section 12 of the spray device 10 and thereby moved past the cooling nozzles 16.
  • the flowchart from Fig. 8 that it is possible by means of individual process parameters, which can include the geometry, the measured temperature of the metallic product 1 within the spray device 10 in its inlet area 14 and/or outlet area 15 and/or the surface quality of the metallic product 1 measured downstream of the spray device 10 is to implement automated process control that influences the operation of the continuous casting plant 100.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Description

Die Erfindung betrifft ein Verfahren zur thermischen Oberflächenbehandlung eines metallischen Produkts nach dem Oberbegriff von Anspruch 1, und eine zu diesem Zweck vorgesehene Sprüheinrichtung nach dem Oberbegriff jeweils von Anspruch 21, 22 und 27.The invention relates to a method for the thermal surface treatment of a metallic product according to the preamble of claim 1, and a spray device provided for this purpose according to the preamble of claims 21, 22 and 27.

Nach dem Stand der Technik ist es bekannt, metallische Produkte, beispielsweise Stranggießprodukte, einer Wärmebehandlung in Form einer thermischen Oberflächenbehandlung zu unterziehen. Zu diesem Zweck kann ein metallisches Produkt durch eine Sprühkammervorrichtung hindurchgeführt werden, wobei das metallische Produkt innerhalb dieser Sprühkammervorrichtung durch Ausbringen von Wasser auf eine Oberfläche des Produkts kontinuierlich gekühlt wird. Hierbei wird eine Oberflächenabschreckung der äußeren Schicht des metallischen Produkts erreicht. Eine solche Technologie ist beispielsweise aus EP 0 650 790 B1 bekannt.According to the prior art, it is known to subject metallic products, for example continuously cast products, to a heat treatment in the form of a thermal surface treatment. For this purpose, a metallic product can be passed through a spray chamber device, the metallic product being continuously cooled within this spray chamber device by applying water to a surface of the product. This achieves surface quenching of the outer layer of the metallic product. Such a technology is out, for example EP 0 650 790 B1 known.

Zum Bearbeiten von heiß gewalztem Stahl in Form eines Stahl-Zwischenproduktes ist es beispielsweise aus DE 196 81 466 T1 bekannt, den Stahl nach einem Walzschritt einer beschleunigten Abkühlung mit einer Geschwindigkeit von 12°C bis 20°C /Sekunde zu unterziehen, um eine Austrittstemperatur im Bereich von etwa 470 °C bis etwa 570 °C zu erreichen. Ein somit behandeltes Stahlprodukt erhält hierdurch eine erhöhte Festigkeit und Zähigkeit mit einer bevorzugten Struktur einschließlich eines wesentlichen Anteils an feinkörnigem Bainit. Weitere Verfahren sowie Vorrichtungen zur thermischen Oberflächenbehandlung eines metallischen Produkt sind auch aus den Dokumente WO 00/03042 A1 , EP 3 184 202 A1 und WO 2012/069234 A1 bekannt.For example, it is suitable for processing hot-rolled steel in the form of an intermediate steel product DE 196 81 466 T1 known to subject the steel after a rolling step to accelerated cooling at a rate of 12 ° C to 20 ° C / second in order to achieve an exit temperature in the range of approximately 470 ° C to approximately 570 ° C. A steel product treated in this way has increased strength and toughness with a preferred structure including a significant proportion of fine-grained bainite. Further processes and devices for thermal surface treatment of a metallic product are also from the documents WO 00/03042 A1 , EP 3 184 202 A1 and WO 2012/069234 A1 known.

Bei dem vorstehend genannten Stand der Technik verhält es sich so, dass die Wärmebehandlung für ein metallisches Produkt über dessen Länge gesehen im Wesentlichen gleichförmig bzw. mit gleichen Abkühlraten erfolgt. Insoweit besteht diesbezüglich ein Nachteil darin, dass ein möglicher unterschiedlicher Energiegehalt, der bei einem zu kühlenden metallischen Produkt über dessen Länge vorliegen kann, im Zuge der Produktion bzw. Herstellung des metallischen Produkts nicht genügend berücksichtigt wird.In the prior art mentioned above, the heat treatment for a metallic product takes place essentially uniformly over its length or with the same cooling rates. In this respect, there is a disadvantage in that a possible different Energy content that may be present over the length of a metallic product to be cooled is not sufficiently taken into account in the course of the production or manufacture of the metallic product.

Entsprechend liegt der Erfindung die Aufgabe zugrunde, die Herstellung eines metallischen Produkts hinsichtlich seiner thermischen Oberflächenbehandlung zu optimieren, um dadurch eine resultierende Material- bzw. Gefügestruktur des metallischen Produkts beeinflussen zu können.Accordingly, the invention is based on the object of optimizing the production of a metallic product with regard to its thermal surface treatment in order to be able to influence a resulting material or microstructure of the metallic product.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen von Anspruch 1 und durch eine Sprüheinrichtung mit den Merkmalen von jeweils einem der Ansprüche 21, 22 und 27 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen definiert.This object is achieved by a method with the features of claim 1 and by a spray device with the features of one of claims 21, 22 and 27. Advantageous developments of the invention are defined in the dependent claims.

Die Erfindung sieht ein Verfahren zur thermischen Oberflächenbehandlung eines metallischen Produkts insbesondere in Form eines Gießstrangs oder einer hieraus gebildeten Bramme vor, bei dem das metallische Produkt in einer Transportrichtung durch einen mit Kühldüsen ausgestatteten Behandlungsabschnitt einer Sprüheinrichtung hindurch bewegt wird und dabei Kühlfluid durch die Kühldüsen der Sprüheinrichtung auf die Oberflächen des metallischen Produkts ausgebracht wird. Das metallische Produkt weist - in der Transportrichtung des metallischen Produkts gesehen - einen vorderen Abschnitt und einen nacheilenden hinteren Abschnitt auf. Bei Durchführung dieses Verfahrens wird der hintere Abschnitt des metallischen Produkts stärker gekühlt als der vordere Abschnitt des metallischen Produkts. Dies hat zur Folge, dass sich durch den Wärmeentzug mittels des auf die Oberflächen des metallischen Produkts ausgebrachten Kühlfluids in dem Material des metallischen Produkts in einer vorbestimmten Tiefe hiervon über einen Längenbereich, der sich zwischen dem vorderen Abschnitt und dem hinteren Abschnitt des metallischen Produkts erstreckt, ein im Wesentlichen gleichmäßiger Ferrit-Anteil einstellt.The invention provides a method for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, in which the metallic product is moved in a transport direction through a treatment section of a spray device equipped with cooling nozzles and cooling fluid is passed through the cooling nozzles of the spray device is applied to the surfaces of the metallic product. The metallic product has - viewed in the transport direction of the metallic product - a front section and a trailing rear section. When performing this process, the rear portion of the metallic product is cooled more than the front portion of the metallic product. The result of this is that the heat removal by means of the cooling fluid applied to the surfaces of the metallic product in the material of the metallic product at a predetermined depth thereof over a length range that extends between the front section and the rear section of the metallic product, a substantially uniform ferrite content is established.

In vorteilhafter Weiterbildung des erfindungsgemäßen Verfahrens sind die Kühldüsen zumindest in einer ersten Gruppe und in einer zweiten Gruppe angeordnet. Hierbei ist vorgesehen, dass die zweite Gruppe der Kühldüsen - in der Transportrichtung des metallischen Produkts gesehen - stromabwärts von der ersten Gruppe der Kühldüsen angeordnet ist.In an advantageous development of the method according to the invention, the cooling nozzles are arranged at least in a first group and in a second group. It is provided here that the second group of cooling nozzles - viewed in the transport direction of the metallic product - is arranged downstream of the first group of cooling nozzles.

In vorteilhafter Weiterbildung des erfindungsgemäßen Verfahrens sind die Kühldüsen zur Versorgung mit Kühlfluid an zumindest eine frequenzgeregelte Pumpe angeschlossen, mit der das Kühlfluid mit einer vorbestimmten Menge und einem vorbestimmten Druck zu den Kühldüsen gefördert wird. Hierbei kann vorgesehen sein, dass für die erste Gruppe der Kühldüsen und für die zweite Gruppe der Kühldüsen jeweils separate frequenzgeregelte Pumpen vorgesehen sind. Alternativ hierzu kann auch vorgesehen sein, dass die erste und zweite Gruppe von Kühldüsen von nur einer zentralen frequenzgeregelten Pumpe mit Kühlfluid gespeist werden, wobei in einer Leitung zwischen der frequenzgeregelten Pumpe und den Kühldüsen der ersten bzw. zweiten Gruppe zumindest ein Stellventil vorgesehen ist, mit dem in Bezug auf das Kühlfluid eine gezielte Wassermenge und/oder ein vorbestimmter Druck für die Kühldüsen der ersten bzw. zweiten Gruppe eingestellt werden kann.In an advantageous development of the method according to the invention, the cooling nozzles are connected to at least one frequency-controlled pump for supplying cooling fluid, with which the cooling fluid is conveyed to the cooling nozzles with a predetermined amount and a predetermined pressure. It can be provided here that separate frequency-controlled pumps are provided for the first group of cooling nozzles and for the second group of cooling nozzles. Alternatively, it can also be provided that the first and second groups of cooling nozzles are fed with cooling fluid by only one central frequency-controlled pump, with at least one control valve being provided in a line between the frequency-controlled pump and the cooling nozzles of the first and second groups, respectively in which a targeted amount of water and/or a predetermined pressure can be set for the cooling nozzles of the first or second group in relation to the cooling fluid.

Die vorliegende Erfindung sieht auch eine Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts insbesondere in Form eines Gießstrangs oder einer hieraus gebildeten Bramme vor, umfassend einen Behandlungsabschnitt mit einem Einlaufbereich und einem Auslaufbereich, wobei das metallische Produkt entlang des Behandlungsabschnitts von dem Einlaufbereich in Richtung des Auslaufbereichs in einer Transportrichtung bewegt werden kann, und eine Mehrzahl von Kühldüsen, aus denen jeweils ein Kühlfluid auf die Oberflächen des metallischen Produkts ausgebracht werden kann. Die Kühldüsen sind zumindest in einer ersten Gruppe und in einer zweiten Gruppe angeordnet, wobei die zweite Gruppe der Kühldüsen - in der Transportrichtung des metallischen Produkts gesehen - stromabwärts von der ersten Gruppe der Kühldüsen angeordnet ist. Hierbei sind die Kühldüsen der ersten Gruppe und die Kühldüsen der zweiten Gruppe jeweils an separate frequenzgeregelte Pumpen angeschlossen. Mit diesen jeweiligen frequenzgeregelten Pumpen ist in Bezug auf das Kühlfluid eine vorbestimmten Menge und/oder ein vorbestimmter Druck für die Kühldüsen der ersten Gruppe bzw. für die Kühldüsen der zweiten Gruppe einstellbar, vorzugsweise regelbar.The present invention also provides a spray device for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, comprising a treatment section with an inlet area and an outlet area, the metallic product being sprayed along the treatment section from the inlet area in the direction of the outlet area can be moved in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product. The cooling nozzles are arranged at least in a first group and in a second group, with the second group of cooling nozzles - seen in the transport direction of the metallic product - downstream of the first group Cooling nozzles are arranged. The cooling nozzles of the first group and the cooling nozzles of the second group are each connected to separate frequency-controlled pumps. With these respective frequency-controlled pumps, a predetermined quantity and/or a predetermined pressure for the cooling nozzles of the first group or for the cooling nozzles of the second group can be set, preferably regulated, with respect to the cooling fluid.

Eine alternative Ausführungsform der Erfindung, der eine eigenständige Bedeutung zukommt, sieht eine Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts insbesondere in Form eines Gießstrangs oder einer hieraus gebildeten Bramme vor, umfassend einen Behandlungsabschnitt mit einem Einlaufbereich und einem Auslaufbereich, wobei das metallische Produkt entlang des Behandlungsabschnitts von dem in Richtung des Auslaufbereichs in einer Transportrichtung bewegt werden kann, und eine Mehrzahl von Kühldüsen, aus denen jeweils ein Kühlfluid auf die Oberflächen des metallischen Produkts ausgebracht werden kann. Die Kühldüsen sind zumindest in einer ersten Gruppe und in einer zweiten Gruppe angeordnet, wobei die zweite Gruppe der Kühldüsen - in der Transportrichtung des metallischen Produkts gesehen - stromabwärts von der ersten Gruppe der Kühldüsen angeordnet ist. Hierbei sind die Kühldüsen der ersten Gruppe und die Kühldüsen der zweiten Gruppe an zumindest eine frequenzgeregelte Pumpe angeschlossen, wobei in einer Leitung zwischen der frequenzgeregelten Pumpe und den Kühldüsen der ersten bzw. zweiten Gruppe zumindest ein Stellventil vorgesehen ist, mit dem in Bezug auf das Kühlfluid eine Wassermenge und/oder ein Druck für die Kühldüsen der ersten bzw. zweiten Gruppe einstellbar, vorzugsweise regelbar ist.An alternative embodiment of the invention, which has an independent meaning, provides a spray device for the thermal surface treatment of a metallic product, in particular in the form of a casting strand or a slab formed therefrom, comprising a treatment section with an inlet area and an outlet area, the metallic product being sprayed along the treatment section which can be moved in the direction of the outlet area in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product. The cooling nozzles are arranged at least in a first group and in a second group, with the second group of cooling nozzles - viewed in the transport direction of the metallic product - being arranged downstream of the first group of cooling nozzles. Here, the cooling nozzles of the first group and the cooling nozzles of the second group are connected to at least one frequency-controlled pump, with at least one control valve being provided in a line between the frequency-controlled pump and the cooling nozzles of the first and second groups, with which the cooling fluid is connected a quantity of water and/or a pressure for the cooling nozzles of the first or second group is adjustable, preferably controllable.

In vorteilhafter Weiterbildung der erfindungsgemäßen Sprüheinrichtung ist eine Steuereinrichtung vorgesehen, mit der die frequenzgeregelte Pumpe, oder die frequenzgeregelten Pumpen, und/oder das Stellventil in Signalverbindung steht bzw. stehen. Hierdurch ist es möglich, dass der Betrieb dieser Pumpen und/oder des Stellventils in Abhängigkeit von zumindest einem Prozessparameter des metallischen Produkts gesteuert, vorzugsweise geregelt werden kann. Zu diesen Prozessparametern des metallischen Produkts kann die Temperatur stromaufwärts und/oder stromabwärts der Sprüheinrichtung, die Temperatur an der Oberseite und/oder an der Unterseite, und/oder ein Ferritanteil, welcher stromabwärts von der Sprüheinrichtung gemessen worden ist, gehören.In an advantageous development of the spray device according to the invention, a control device is provided with which the frequency-controlled pump, or the frequency-controlled pumps, and / or the control valve is or are in signal connection. This makes it possible for the operation of these pumps and/or the control valve to be dependent on at least one process parameter metallic product can be controlled, preferably regulated. These process parameters of the metallic product may include the temperature upstream and/or downstream of the spray device, the temperature at the top and/or bottom, and/or a ferrite content that was measured downstream of the spray device.

Der Erfindung liegt die wesentliche Erkenntnis zugrunde, dass das metallische Produkt, bei dem es sich um einen noch durchgehenden bzw. endlosen Gießstrang oder um eine hieraus gebildete vereinzelte Bramme handeln kann, in Bezug auf seine Längserstreckung ungleichmäßig gekühlt wird. Konkret stellt sich dies bei dem erfindungsgemäßen Verfahren so dar, dass der - in der Transportrichtung des metallischen Produkts gesehen - hintere Abschnitt des metallischen Produkts stärker gekühlt wird als dessen vorderer Abschnitt, mit der Folge, dass damit in einem zwischen dem vorderen und hinteren Abschnitt des metallischen Produkts sich erstreckenden Längenbereich des metallischen Produkts eine gezielte Gefügestruktur erreicht wird, nämlich ein im wesentlichen gleichmäßiger Ferrit-Anteil. Genau zu diesem Zweck sind bei der erfindungsgemäßen Sprüheinrichtung die Kühldüsen zumindest in einer ersten Gruppe und in einer zweiten Gruppe angeordnet, wobei diese Gruppen von Kühldüsen - in der Transportrichtung des metallischen Produkts gesehen - mit jeweils unterschiedlichen Mengen an Kühlfluid gespeist werden können. Dies wird entweder durch eine geeignete Steuerung der separaten frequenzgeregelten Pumpen, an denen die Kühldüsen der jeweiligen ersten und zweiten Gruppe angeschlossen sind, erreicht, oder durch eine geeignete Ansteuerung des zumindest einen Stellventils, welches in einer Leitung zwischen der frequenzgeregelten Pumpe und den Kühldüsen der ersten bzw. zweiten Gruppe vorgesehen ist.The invention is based on the essential finding that the metallic product, which can be a continuous or endless casting strand or an isolated slab formed from it, is cooled unevenly with respect to its longitudinal extent. Specifically, in the method according to the invention, this occurs in such a way that the rear section of the metallic product - viewed in the transport direction of the metallic product - is cooled more strongly than its front section, with the result that in between the front and rear sections of the Metallic product extending length range of the metallic product a targeted microstructure is achieved, namely an essentially uniform ferrite proportion. Precisely for this purpose, in the spray device according to the invention, the cooling nozzles are arranged at least in a first group and in a second group, whereby these groups of cooling nozzles - seen in the transport direction of the metallic product - can each be fed with different amounts of cooling fluid. This is achieved either by a suitable control of the separate frequency-controlled pumps to which the cooling nozzles of the respective first and second groups are connected, or by a suitable control of the at least one control valve, which is in a line between the frequency-controlled pump and the cooling nozzles of the first or second group is provided.

Im Zuge der vorstehend genannten thermischen Oberflächenbehandlung, die für die vorliegende Erfindung charakteristisch ist, besteht ein weiteres Ziel darin, dass der Energiegehalt des metallischen Produkts im Hinblick auf eine weitere Bearbeitung im Anschluss an die thermische Oberflächenbehandlung so groß wie möglich ist. Anders ausgedrückt, wird das metallische Produkt nur in dem Maße gekühlt, wie es für die gewünschte konstante Gefügeumwandlung erforderlich ist, um dadurch den gleichmäßigen Ferrit-Anteil in dem Material des metallischen Produkts in einer vorbestimmten Tiefe hiervon, beispielsweise 5-10 mm, über einen sich zwischen dem vorderen Abschnitt und dem hinteren Abschnitt des metallischen Produkts sich erstreckenden Längenbereich zu erreichen.In the course of the above-mentioned thermal surface treatment, which is characteristic of the present invention, a further aim is that the energy content of the metallic product with regard to a further Processing following thermal surface treatment is as large as possible. In other words, the metallic product is only cooled to the extent required for the desired constant structural transformation, thereby maintaining the uniform ferrite content in the material of the metallic product at a predetermined depth thereof, for example 5-10 mm, over one to achieve a length range extending between the front section and the rear section of the metallic product.

In vorteilhafter Weiterbildung des erfindungsgemäßen Verfahrens sind in dem Behandlungsabschnitt der Sprüheinrichtung oberhalb des metallischen Produkts und/oder unterhalb des metallischen Produkts jeweils eine Mehrzahl von Kühldüsen entlang der Transportrichtung des metallischen Produkts angeordnet. Hierbei wird aus diesen Kühldüsen jeweils ein Kühlfluid unter Druck auf die Oberflächen des metallischen Produkts gespritzt. Dieses Kühlfluid wird zweckmäßigerweise in Form von Wasser oder auf Basis von Wasser eingesetzt.In an advantageous development of the method according to the invention, a plurality of cooling nozzles are arranged in the treatment section of the spray device above the metallic product and/or below the metallic product along the transport direction of the metallic product. A cooling fluid is sprayed under pressure from these cooling nozzles onto the surfaces of the metallic product. This cooling fluid is expediently used in the form of water or based on water.

Zur Realisierung der vorstehend genannten charakteristischen Kühlung des metallischen Produkts, die an dessen hinteren Abschnitt stärker bzw. intensiver ist als an dessen vorderen Abschnitt, ist gemäß der vorliegenden Erfindung vorgesehen, dass die Menge und/oder der Druck für das Kühlfluid für die Kühldüsen der ersten Gruppe größer eingestellt sind als für die Kühldüsen in der zweiten Gruppe. Eine solche Versorgung der Kühldüsen der ersten Gruppe von Kühldüsen mit einer größeren Menge von Kühlfluid und/oder einem größeren Druck als im Vergleich zur zweiten Gruppe von Kühldüsen wird zweckmäßigerweise für die Kühldüsen sowohl an der Oberseite als auch an der Unterseite des metallischen Produkts eingestellt.In order to realize the above-mentioned characteristic cooling of the metallic product, which is stronger or more intensive at its rear section than at its front section, it is provided according to the present invention that the amount and / or the pressure for the cooling fluid for the cooling nozzles of the first Group are set larger than for the cooling nozzles in the second group. Such a supply of the cooling nozzles of the first group of cooling nozzles with a larger amount of cooling fluid and/or a greater pressure than in comparison to the second group of cooling nozzles is expediently set for the cooling nozzles both on the top and on the bottom of the metallic product.

In vorteilhafter Weiterbildung der Erfindung kann vorgesehen sein, dass die Temperatur des metallischen Produkts gemessen wird. Dies kann - in der Transportrichtung des metallischen Produkts gesehen - stromaufwärts und/oder stromabwärts von der Sprüheinrichtung erfolgen. Des Weiteren kann die Temperatur des metallischen Produkts an seiner Oberseite und/oder an seiner Unterseite gemessen werden. Jedenfalls erfolgt die Temperaturmessung für das metallische Produkt zu dem Zweck, dass in Abhängigkeit dieser gemessenen Temperatur des metallischen Produkts die Menge an Kühlfluid, welches aus den Kühldüsen der Sprüheinrichtung auf die Oberflächen des metallischen Produkts ausgebracht wird, eingestellt oder geregelt wird.In an advantageous development of the invention it can be provided that the temperature of the metallic product is measured. This can be done - viewed in the transport direction of the metallic product - upstream and/or downstream of the spray device. Furthermore, the can Temperature of the metallic product can be measured at its top and/or bottom. In any case, the temperature measurement for the metallic product is carried out for the purpose of adjusting or regulating the amount of cooling fluid that is applied from the cooling nozzles of the spray device onto the surfaces of the metallic product depending on this measured temperature of the metallic product.

In gleicher Weise kann in Abhängigkeit einer gemessenen Temperatur des metallischen Produkts auch die Transportgeschwindigkeit eines metallischen Produkts in Form einer vereinzelten Bramme, oder aber die Veränderung dieser Transportgeschwindigkeit für die Bramme innerhalb des Behandlungsabschnitts der Sprüheinrichtung, eingestellt oder geregelt werden. Diesbezüglich ist zu verstehen, dass mittels der Transportgeschwindigkeit, mit der eine vereinzelte Bramme in dem Behandlungsabschnitt der Sprüheinrichtung an den darin vorgesehenen Kühldüsen vorbeigeführt wird, oder aber deren gezielten Veränderung erreicht werden kann, dass der vordere Abschnitt der Bramme an diesen Kühldüsen schneller vorbeigeführt wird als der hintere Abschnitt der Bramme, mit der Folge, dass damit - wie erläutert - dann der hintere Abschnitt der Bramme stärker gekühlt wird.In the same way, depending on a measured temperature of the metallic product, the transport speed of a metallic product in the form of a separated slab, or the change in this transport speed for the slab within the treatment section of the spray device, can also be adjusted or regulated. In this regard, it should be understood that by means of the transport speed at which an isolated slab is guided past the cooling nozzles provided therein in the treatment section of the spray device, or by specifically changing them, it can be achieved that the front section of the slab is guided past these cooling nozzles faster than the rear section of the slab, with the result that - as explained - the rear section of the slab is then cooled more strongly.

Eine weitere Möglichkeit für eine gezielte Beeinflussung der Kühlung des metallischen Produkts besteht darin, dass - in der Transportrichtung des metallischen Produkts gesehen - stromabwärts von der Sprüheinrichtung die Oberflächengüte des metallischen Produkts in Bezug auf den Anteil an Ferritanteil gemessen wird. Hierdurch ist es möglich, dass dann die Menge an Kühlfluid, welches aus den Kühldüsen der Sprüheinrichtung auf die Oberflächen des metallischen Produkts ausgebracht wird, und/oder dessen Druck und/oder die Transportgeschwindigkeit der Bramme oder die Veränderung dieser Transportgeschwindigkeit entlang des Behandlungsabschnitts der Sprüheinrichtung in Abhängigkeit des gemessenen Anteils an Ferrit eingestellt oder geregelt werden.Another possibility for a targeted influence on the cooling of the metallic product is that - viewed in the transport direction of the metallic product - the surface quality of the metallic product is measured downstream of the spraying device in relation to the proportion of ferrite. This makes it possible for the amount of cooling fluid that is applied from the cooling nozzles of the spray device to the surfaces of the metallic product and/or its pressure and/or the transport speed of the slab or the change in this transport speed along the treatment section of the spray device in Depending on the measured proportion of ferrite can be set or regulated.

Für den Fall, dass gemäß einer vorteilhaften Weiterbildung der Erfindung die Kühldüsen entlang des Behandlungsabschnitts der Sprüheinrichtung auf beiden Seiten des metallischen Produkts, d.h. oberhalb und unterhalb davon angeordnet sind, ist es zweckmäßig, dass die Wassermenge und/oder der Druck für die Kühldüsen unterhalb des metallischen Produkts größer gewählt sind als für die Kühldüsen, die oberhalb des metallischen Produkts angeordnet sind. Dies kann dadurch erreicht werden, dass die Kühldüsen, welche an der Unterseite des metallischen Produkts angeordnet sind, von einer eigenen frequenzgeregelten Pumpe mit Kühlfluid versorgt werden, was bedeutet, dass die Kühldüsen, welche an der Oberseite des metallischen Produkts angeordnet sind, von einer separaten frequenzgeregelten Pumpe mit Kühlfluid gespeist werden. Anders ausgedrückt, wird die unterschiedliche Versorgung der Kühldüsen an der Unterseite des metallischen Produkts im Vergleich zu den Kühldüsen an der Oberseite des metallischen Produkts dadurch erreicht, dass die Kühldüsen, welche unterhalb und oberhalb des metallischen Produkts angeordnet sind, jeweils an unterschiedliche frequenzgeregelte Pumpen zur Versorgung mit Kühlfluid angeschlossen sind.In the event that, according to an advantageous development of the invention, the cooling nozzles are arranged along the treatment section of the spray device on both sides of the metallic product, i.e. above and below it, it is expedient that the amount of water and / or the pressure for the cooling nozzles is below metallic product are chosen to be larger than for the cooling nozzles, which are arranged above the metallic product. This can be achieved by supplying the cooling nozzles, which are arranged on the bottom of the metallic product, with cooling fluid from their own frequency-controlled pump, which means that the cooling nozzles, which are arranged on the top of the metallic product, are supplied by a separate one Frequency-controlled pump can be fed with cooling fluid. In other words, the different supply of the cooling nozzles on the underside of the metallic product compared to the cooling nozzles on the top of the metallic product is achieved in that the cooling nozzles, which are arranged below and above the metallic product, are each supplied to different frequency-controlled pumps connected with cooling fluid.

In vorteilhafter Weiterbildung der Erfindung kann vorgesehen sein, dass die Dicke des metallischen Produkts, für welches die charakteristische thermische Oberflächenbehandlung realisiert wird, zumindest 250 mm beträgt, und/oder das eine Breite des metallischen Produkts zumindest 3000 mm beträgt.In an advantageous development of the invention, it can be provided that the thickness of the metallic product for which the characteristic thermal surface treatment is implemented is at least 250 mm and/or that a width of the metallic product is at least 3000 mm.

In vorteilhafter Weiterbildung der Erfindung kann auch vorgesehen sein, dass das Kühlfluid aus den Kühldüsen intermittierend auf die Oberflächen des metallischen Produkts ausgebracht wird. Dies führt zu dem Vorteil, dass ein gesteuerter örtlicher Wärmeentzug mittels intensiver Wasserkühlung beispielsweise an einer bestimmten Stelle des metallischen Produkts in Bezug auf seine Längserstreckung erreicht werden kann.In an advantageous development of the invention, it can also be provided that the cooling fluid is intermittently applied from the cooling nozzles to the surfaces of the metallic product. This leads to the advantage that a controlled local heat removal can be achieved by means of intensive water cooling, for example at a specific point on the metallic product in relation to its longitudinal extent.

Gemäß einer weiteren alternativen Ausführungsform der Erfindung, der eine eigenständige Bedeutung zukommt, ist eine Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts in Form einer vereinzelten Bramme, umfassend einen Behandlungsabschnitt mit einem Einlaufbereich und einem Auslaufbereich, wobei das metallische Produkt entlang des Behandlungsabschnitts auf einem Rollgang von dem Einlaufbereich in Richtung des Auslaufbereichs in einer Transportrichtung bewegt werden kann, und eine Mehrzahl von Kühldüsen, aus denen jeweils ein Kühlfluid auf die Oberflächen des metallischen Produkts ausgebracht werden kann. Hierbei ist zumindest ein Rollenelement des Rollgangs mit einem motorischen Antrieb ausgestattet. Vorzugsweise kann das mit dem motorischen Antrieb ausgestattete Rollenelement angrenzend zu dem Behandlungsabschnitt angeordnet sein.According to a further alternative embodiment of the invention, which has an independent meaning, is a spray device for the thermal surface treatment of a metallic product in the form of a separated slab, comprising a treatment section with an inlet area and an outlet area, the metallic product being moved along the treatment section on a roller table of the inlet area can be moved towards the outlet area in a transport direction, and a plurality of cooling nozzles, from each of which a cooling fluid can be applied to the surfaces of the metallic product. At least one roller element of the roller table is equipped with a motor drive. Preferably, the roller element equipped with the motor drive can be arranged adjacent to the treatment section.

Bei der zuletzt genannten Ausführungsform der erfindungsgemäßen Sprüheinrichtung kann durch eine Ansteuerung des motorischen Antriebs, mit dem zumindest ein Rollenelement des Rollgangs ausgerüstet ist, erreicht werden, dass eine vereinzelte Bramme mit ihrem - in der Transportrichtung gesehen - vorderen Abschnitt an den in dem Behandlungsabschnitt angeordneten Kühldüsen schneller vorbeigeführt wird als der hintere Abschnitt der vereinzelten Bramme. Im Ergebnis führt dies dazu, dass dann der hintere Abschnitt der vereinzelten Bramme stärker gekühlt wird als deren vordere Abschnitt, mit der Folge, dass sich damit, wie vorstehend an anderer Stelle bereits erläutert, in dem Material der Bramme in einer vorbestimmten Tiefe hiervon über einen Längenbereich, der sich zwischen dem vorderen Abschnitt und dem hinteren Abschnitt der Bramme erstreckt, ein im Wesentlichen gleichmäßiger Ferrit-Anteil einstellt.In the last-mentioned embodiment of the spraying device according to the invention, by controlling the motor drive with which at least one roller element of the roller table is equipped, it can be achieved that an isolated slab with its front section - viewed in the transport direction - is attached to the cooling nozzles arranged in the treatment section is passed faster than the rear section of the isolated slab. As a result, this leads to the rear section of the isolated slab being cooled more strongly than its front section, with the result that, as already explained elsewhere above, there is a predetermined depth in the material of the slab Length range that extends between the front section and the rear section of the slab sets a substantially uniform ferrite proportion.

In vorteilhafter Weiterbildung der zuletzt genannten Ausführungsform der erfindungsgemäßen Sprüheinrichtung ist eine Steuereinrichtung vorgesehen, mit welcher der motorische Antrieb des Rollenelements in Signalverbindung steht, nämlich derart, dass die Drehzahl bzw. die Umfangsgeschwindigkeit des Rollenelement in Abhängigkeit von zumindest einem Prozessparameter des metallischen Produkts bzw. der vereinzelten Bramme gesteuert und vorzugsweise geregelt werden kann.In an advantageous development of the last-mentioned embodiment of the spray device according to the invention, a control device is provided with which the motor drive of the roller element is in signal connection, namely such that the speed or the peripheral speed of the roller element depends on at least one process parameter of the metallic Product or the isolated slab can be controlled and preferably regulated.

In vorteilhafter Weiterbildung der Erfindung kann der zumindest eine Prozessparameter des metallischen Produkts, in Abhängigkeit dessen die Menge und/oder der Druck für das Kühlfluid eingestellt oder geregelt werden können, gewählt sein aus der Gruppe bestehend aus Temperatur, Ferrit-Anteil in dem Material des metallischen Produkts und/oder Geometrie des metallischen Produkts insbesondere in Bezug auf seinen Querschnitt senkrecht zur Transportrichtung.In an advantageous development of the invention, the at least one process parameter of the metallic product, depending on which the amount and/or the pressure for the cooling fluid can be adjusted or regulated, can be selected from the group consisting of temperature, ferrite content in the material of the metallic Product and/or geometry of the metallic product, in particular in relation to its cross section perpendicular to the transport direction.

Mittels der vorliegenden Erfindung wird eine Technologie für eine gezielte thermische Oberflächenbehandlung geschaffen, die eine automatisierte Einstellung der Temperatur für ein metallisches Produkt und dessen daraus resultierendes Metallgefüge ermöglicht. Beispielsweise bewirkt das gezielte Ausbringen einer größeren Menge von Kühlfluid durch die Kühldüsen der ersten Gruppe als im Vergleich durch die Kühldüsen der zweiten Gruppe, dass der hintere Abschnitt des metallischen Produkts einer örtlich gesteuerten intensiveren Kühlung unterzogen wird als der vordere Abschnitt des metallischen Produkts.The present invention creates a technology for targeted thermal surface treatment that enables automated adjustment of the temperature for a metallic product and its resulting metal structure. For example, the targeted delivery of a larger amount of cooling fluid through the cooling nozzles of the first group than through the cooling nozzles of the second group causes the rear section of the metallic product to undergo locally controlled, more intensive cooling than the front section of the metallic product.

Die vorliegende Erfindung ermöglicht eine Beeinflussung der Oberflächenqualität und Struktur eines auf einer Vertikal-, Vertikal-Abbiege (also Anlage mit einem senkrechten Bereich), einer Horizontal- oder Bogenstranggießanlage (ohne senkrechten Bereich), erzeugten Gießstranges aus Stahl, insbesondere eines Gießstranges jedweden Produktformates.The present invention makes it possible to influence the surface quality and structure of a steel casting strand produced on a vertical, vertical bend (i.e. system with a vertical area), a horizontal or curved continuous casting system (without a vertical area), in particular a casting strand of any product format.

Nachstehend sind Ausführungsbeispiele der Erfindung anhand einer schematisch vereinfachten Zeichnung im Detail beschrieben. Es zeigen:

Fig. 1
eine schematisch vereinfachte Seitenansicht einer Stranggießanlage, die eine erfindungsgemäße Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts umfasst, und mit der ein erfindungsgemäßes Verfahren durchführbar ist,
Fig. 2
eine vergrößerte Darstellung der Sprüheinrichtung von Fig. 1 gemäß einer ersten Ausführungsform,
Fig. 3
eine vergrößerte Darstellung der Sprüheinrichtung von Fig. 1 gemäß einer zweiten Ausführungsform,
Fig. 4
eine vereinfachte Seitenansicht eines Rollgangs, der Teil der Stranggießanlage von Fig. 1 ist,
Fig. 5
eine vereinfachte Seitenansicht eines Rollgangs, der Teil der Stranggießanlage von Fig. 1 ist, gemäß einer weiteren Ausführungsform,
Fig. 6
eine Perspektivansicht eines Schnellwechselrahmens, der Teil der Sprüheinrichtung von Fig. 2 ist, und
Fig. 7
eine Perspektivansicht einer Mehrzahl von Schnellwechselrahmen wie in Fig. 6 gezeigt, die zu einer Sprüheinrichtung gemäß Fig. 2 zusammengefasst sind, und
Fig. 8
ein Flussdiagramm zur Veranschaulichung eines erfindungsgemäßen Verfahrens und dessen Durchführung.
Exemplary embodiments of the invention are described in detail below using a schematically simplified drawing. Show it:
Fig. 1
a schematically simplified side view of a continuous casting system, which has a spray device according to the invention for thermal surface treatment a metallic product, and with which a method according to the invention can be carried out,
Fig. 2
an enlarged view of the spray device from Fig. 1 according to a first embodiment,
Fig. 3
an enlarged view of the spray device from Fig. 1 according to a second embodiment,
Fig. 4
a simplified side view of a roller table, which is part of the continuous caster of Fig. 1 is,
Fig. 5
a simplified side view of a roller table, which is part of the continuous caster of Fig. 1 is, according to a further embodiment,
Fig. 6
a perspective view of a quick-change frame, which is part of the spray device Fig. 2 is and
Fig. 7
a perspective view of a plurality of quick-change frames as in Fig. 6 shown, which corresponds to a spray device Fig. 2 are summarized, and
Fig. 8
a flowchart to illustrate a method according to the invention and its implementation.

Nachstehend sind unter Bezugnahme auf die Fig. 1-8 bevorzugte Ausführungsformen einer Sprüheinrichtung 10 und eines entsprechenden Verfahrens zur thermischen Oberflächenbehandlung eines metallischen Produkts gemäß der vorliegenden Erfindung dargestellt und erläutert, um damit für das metallische Produkt eine gezielte Gefügeumwandlung bzw. ein gewünschtes Gefüge, nämlich einen im Wesentlichen gleichmäßigen Ferrit-Anteil zu erreichen. Gleiche Merkmale in der Zeichnung sind jeweils mit gleichen Bezugszeichen versehen. An dieser Stelle wird gesondert darauf hingewiesen, dass die Zeichnung lediglich vereinfacht und insbesondere ohne Maßstab dargestellt ist.Below are with reference to the Fig. 1-8 preferred embodiments of a spray device 10 and a corresponding method for thermal surface treatment of a metallic product according to the present invention are shown and explained in order to achieve a targeted structural transformation or a desired structure, namely a substantially uniform ferrite content, for the metallic product. The same features in the drawing are each provided with the same reference numbers. At this point it should be noted that the drawing is simply simplified and, in particular, shown without a scale.

Fig. 1 zeigt prinzipiell vereinfacht eine Seitenansicht einer Stranggießanlage 100, die mit der Sprüheinrichtung 10 ausgestattet ist. Fig. 1 basically shows a simplified side view of a continuous casting system 100, which is equipped with the spray device 10.

In bekannter Weise umfasst die Stranggießanlage 100 nach Fig. 1 eine Kokille, die eine untere Öffnung und hierdurch einen vertikalen Ausgang nach unten aufweist. In die Kokille wird bis zu einem Gießspiegel bzw. flüssiges Metall eingefüllt, z.B. Stahl oder eine Stahllegierung. Durch die untere Öffnung der Kokille tritt ein metallisches Produkt 1 in Form eines Gießstrangs 2 aus, der anschließend durch eine stützende Strangführung hindurchläuft und dabei in die Horizontale überführt wird.In a known manner, the continuous casting system 100 includes Fig. 1 a mold that has a lower opening and thereby a vertical outlet downwards. The mold is filled with liquid metal up to a level or liquid metal, for example steel or a steel alloy. A metallic product 1 emerges through the lower opening of the mold in the form of a casting strand 2, which then runs through a supporting strand guide and is thereby transferred to the horizontal.

Die Stranggießanlage 100 umfasst einen Rollgang 8 mit einer Vielzahl von Rollenelementen 9, auf denen der Gießstrang 2 nach seinem Überführen in die Horizontale weiter in der Transportrichtung T bewegt wird.The continuous casting system 100 comprises a roller table 8 with a plurality of roller elements 9, on which the casting strand 2 is moved further in the transport direction T after it has been transferred to the horizontal.

Bei der Stranggießanlage 100 gemäß Fig. 1 kann es sich um eine Dickbrammenanlage handeln, mit der ein Gießstrang 2 mit einer Dicke von vorzugsweise 250 mm, oder ggf. noch größeren Gießdicken, hergestellt werden kann.For the continuous casting plant 100 according to Fig. 1 It can be a thick slab plant with which a casting strand 2 with a thickness of preferably 250 mm, or possibly even larger casting thicknesses, can be produced.

Die erfindungsgemäße Sprüheinrichtung 10 ist in einem Teil der Stranggießanlage 100 angeordnet, in dem der Gießstrang 2 bereits in die Horizontale überführt ist. Diese Sprüheinrichtung 10 dient zur thermischen Oberflächenbehandlung des Gießstrangs 2 und ist zu diesem Zweck mit einer Mehrzahl von Kühldüsen 16 ausgestattet, die in einem Behandlungsabschnitt 12 der Sprüheinrichtung 10 vorgesehen sind.The spray device 10 according to the invention is arranged in a part of the continuous casting system 100 in which the casting strand 2 has already been transferred to the horizontal. This spray device 10 is used for the thermal surface treatment of the casting strand 2 and for this purpose is equipped with a plurality of cooling nozzles 16 which are provided in a treatment section 12 of the spray device 10.

Die Sprüheinrichtung10 umfasst ein Gehäuse G. In einem - in der Transportrichtung T des Gießstrangs 2 gesehen - vorderen Bereich hiervon ist ein Einlaufbereich 14 für den Gießstrang 2 ausgebildet, wobei in einem - in der Transportrichtung T des Gießstrangs 2 gesehen - hinteren Bereich des Gehäuses G ein Auslaufbereich 15 ausgebildet ist.The spray device 10 comprises a housing G. In a front region of this - seen in the transport direction T of the casting strand 2 - an inlet region 14 is formed for the casting strand 2, with in a - seen in the transport direction T of the casting strand 2 - rear region of the housing G an outlet area 15 is formed.

Angrenzend zum Einlaufbereich 14 und zum Auslaufbereich 15 sind innerhalb des Gehäuses G jeweils Temperatur-Messeinrichtungen 13 vorgesehen, mit denen die Temperatur des Gießstrangs 2 sowohl beim Einlaufen in das Gehäuse G als auch beim Verlassen des Gehäuses G bestimmt werden kann. Diese Temperatur-Messeinrichtungen 13 können jeweils oberhalb und unterhalb des Gießstrangs 2 bzw. des Rollgangs 8, auf dem der Gießstrang 2 auch innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 in der Transportrichtung T bewegt wird, angeordnet sein.Adjacent to the inlet area 14 and the outlet area 15, temperature measuring devices 13 are provided within the housing G, with which the Temperature of the casting strand 2 can be determined both when entering the housing G and when leaving the housing G. These temperature measuring devices 13 can each be arranged above and below the casting strand 2 or the roller table 8, on which the casting strand 2 is also moved in the transport direction T within the treatment section 12 of the spray device 10.

Ungeachtet dessen, ob der Gießstrang 2 als endloses Produkt, d.h. vor einer Vereinzelung zu einer Bramme, in den Behandlungsabschnitt 12 der Sprüheinrichtung 10 einläuft oder bereits als vereinzelte Bramme, ist grundsätzlich festzustellen, dass das metallische Produkt 1, wenn es sich innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 befindet, einen - in der Transportrichtung T des Gießstrangs 2 gesehen - vorderen Abschnitt 4 aufweist, mit dem das metallische Produkt 1 voran in den Behandlungsabschnitt 12 einläuft. In gleicher Weise weist das metallische Produkt einen - in der Transportrichtung T des Gießstrangs 2 gesehen - hinteren Abschnitt 5 auf, der dem vorderen Abschnitt 4 nacheilt bzw. sich - wiederum in der Transportrichtung T des Gießstrangs 2 gesehen - stromaufwärts von dem vorderen Abschnitt 4 befindet.Irrespective of whether the casting strand 2 enters the treatment section 12 of the spray device 10 as an endless product, i.e. before being separated into a slab, or already as a separated slab, it can generally be stated that the metallic product 1, if it is within the treatment section 12 the spray device 10, has a front section 4 - seen in the transport direction T of the casting strand 2 - with which the metallic product 1 enters the treatment section 12. In the same way, the metallic product has a rear section 5 - seen in the transport direction T of the casting strand 2 - which lags behind the front section 4 or - again seen in the transport direction T of the casting strand 2 - is located upstream of the front section 4 .

Die einzelnen Kühldüsen 16 sind innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 in zumindest zwei Gruppen zusammengefasst, nämlich in einer ersten Gruppe 16.1 und in einer zweiten Gruppe 16.2. Hierbei ist die zweite Gruppe 16.2 der Kühldüsen 16 - in der Transportrichtung T des Gießstrangs 2 gesehen - stromabwärts von der ersten Gruppe 16.1 der Kühldüsen 16 angeordnet.The individual cooling nozzles 16 are combined into at least two groups within the treatment section 12 of the spray device 10, namely in a first group 16.1 and in a second group 16.2. Here, the second group 16.2 of the cooling nozzles 16 - seen in the transport direction T of the casting strand 2 - is arranged downstream of the first group 16.1 of the cooling nozzles 16.

Sowohl die erste Gruppe 16.1 als auch die zweite Gruppe 16.2 enthalten jeweils Kühldüsen 16, die sowohl an der Oberseite 6 des Gießstrangs 2 als auch an dessen Unterseite 7 angeordnet sind. Die Oberseite 6 und die Unterseite 7 des Gießstrangs sind beispielsweise in den Fig. 2 und Fig. 3 als solche bezeichnet.Both the first group 16.1 and the second group 16.2 each contain cooling nozzles 16, which are arranged both on the top 6 of the casting strand 2 and on its underside 7. The top 6 and the bottom 7 of the casting strand are, for example, in the Fig. 2 and Fig. 3 referred to as such.

Die Stranggießanlage 100 umfasst eine Trenneinrichtung in Form einer Schere S, die - in der Transportrichtung T des Gießstrangs 2 gesehen - stromaufwärts von der Sprüheinrichtung 10 angeordnet ist. In gleicher Weise ist stromaufwärts von der Sprüheinrichtung 10 auch eine Reinigungseinrichtung 22, beispielsweise in Form eines Entzunderers, angeordnet.The continuous casting system 100 comprises a separating device in the form of scissors S, which - seen in the transport direction T of the casting strand 2 - is arranged upstream of the spray device 10. In the same way, a cleaning device 22, for example in the form of a descaler, is also arranged upstream of the spray device 10.

Nachfolgend sind unter Bezugnahme auf die Fig. 2 und Fig. 3 verschiedene Ausführungsformen für die erfindungsgemäße Sprüheinrichtung 10 dargestellt und erläutert. Soweit diese beiden Ausführungsformen die vorstehend bereits im Zusammenhang mit der Fig. 1 erläuterten Merkmale aufweisen und diesbezüglich übereinstimmen, werden diese Merkmale nicht nochmals erläutert.The following are with reference to the Fig. 2 and Fig. 3 various embodiments for the spray device 10 according to the invention are shown and explained. As far as these two embodiments are already mentioned above in connection with the Fig. 1 have the characteristics explained and agree in this respect, these characteristics will not be explained again.

Eine erste Ausführungsform für die erfindungsgemäße Sprüheinrichtung 10 ist in der Fig. 2 gezeigt. Bei dieser Ausführungsform sind separate frequenzgeregelte Pumpen 18 vorgesehen, mit denen eine jeweils getrennte Versorgung der Kühldüsen 16 einerseits der ersten Gruppe 16.1 und andererseits der zweiten Gruppe 16.2 mit Kühlfluid erfolgt. Hierzu sind die Kühldüsen 16 der ersten Gruppe 16.1 bzw. der zweiten Gruppe 16.2 jeweils über eine Leitung 17 an die ihnen zugeordneten frequenzgeregelte Pumpe 18 angeschlossen.A first embodiment for the spray device 10 according to the invention is shown in FIG Fig. 2 shown. In this embodiment, separate frequency-controlled pumps 18 are provided, with which the cooling nozzles 16 on the one hand of the first group 16.1 and on the other hand of the second group 16.2 are supplied with cooling fluid separately. For this purpose, the cooling nozzles 16 of the first group 16.1 and the second group 16.2 are each connected via a line 17 to the frequency-controlled pump 18 assigned to them.

Die beiden frequenzgeregelten Pumpen 18 sind signaltechnisch mit einer Steuereinrichtung 20 verbunden. Beide dieser Pumpen 18 sind durch nicht näher bezeichnete Leitungen mit einem Tank oder dergleichen verbunden, in dem Kühlfluid enthalten ist. Somit kann ein Betrieb dieser Pumpen 20 durch die Steuereinrichtung 20 geeignet gesteuert oder geregelt werden, um dadurch die Kühldüsen 16 sowohl der ersten Gruppe 16.1 als auch der zweiten Gruppe 16.2 mit Kühlfluid zu versorgen.The two frequency-controlled pumps 18 are connected to a control device 20 for signaling purposes. Both of these pumps 18 are connected by unspecified lines to a tank or the like in which cooling fluid is contained. Operation of these pumps 20 can thus be suitably controlled or regulated by the control device 20 in order to thereby supply the cooling nozzles 16 of both the first group 16.1 and the second group 16.2 with cooling fluid.

In den Leitungen 17 zwischen den frequenzgeregelten Pumpen 18 und der ersten Gruppe 16.1 bzw. der zweiten Gruppe 16.2 von Kühldüsen 16 sind jeweils Stellventile 19 vorgesehen, die ebenfalls signaltechnisch mit der Steuereinrichtung 20 verbunden sind und hierdurch aktuiert werden können. Durch eine geeignete Betriebsstellung dieser Stellventile 19 kann gesteuert werden, ob Kühlfluid auf die Oberflächen des Gießstrangs 2 ausgebracht wird oder nicht.In the lines 17 between the frequency-controlled pumps 18 and the first group 16.1 or the second group 16.2 of cooling nozzles 16, control valves 19 are provided, which are also connected to the control device in terms of signaling 20 are connected and can thereby be actuated. A suitable operating position of these control valves 19 can be used to control whether cooling fluid is applied to the surfaces of the casting strand 2 or not.

Fig. 3 zeigt eine zweite Ausführungsform für die erfindungsgemäße Sprüheinrichtung 10. Im Unterschied zur ersten Ausführungsform gemäß Fig. 2 sind nun bei der zweiten Ausführungsform die Kühldüsen 16 sowohl der ersten Gruppe 16.1 als auch der zweiten Gruppe 16.2 an eine gemeinsame frequenzgeregelte Pumpe 18 angeschlossen, zwecks einer Versorgung mit Kühlfluid. Mittels eines Stellventils 19, das in einer Leitung 17 zwischen der frequenzgeregelten Pumpe 18 und den beiden Gruppen 16.1 und 16.2 der Kühldüsen 16 vorgesehen ist, lässt sich einstellen, in welcher Menge und mit welchem Druck das Kühlfluid den Kühldüsen 16 jeweils der ersten Gruppe 16.1 und der zweiten Gruppe 16.2 zugeführt wird. Fig. 3 shows a second embodiment for the spray device 10 according to the invention. In contrast to the first embodiment according to Fig. 2 In the second embodiment, the cooling nozzles 16 of both the first group 16.1 and the second group 16.2 are now connected to a common frequency-controlled pump 18 for the purpose of supplying cooling fluid. By means of a control valve 19, which is provided in a line 17 between the frequency-controlled pump 18 and the two groups 16.1 and 16.2 of the cooling nozzles 16, it is possible to adjust the amount and at what pressure the cooling fluid is supplied to the cooling nozzles 16 of the first group 16.1 and is fed to the second group 16.2.

In gleicher Weise wie bei der ersten Ausführungsform von Fig. 2 können auch bei der zweiten Ausführungsform gemäß Fig. 3 die frequenzgeregelte Pumpe 18 und das Stellventil 17 jeweils von der Steuereinrichtung 20 angesteuert bzw. geregelt werden.In the same way as in the first embodiment of Fig. 2 can also be used in the second embodiment Fig. 3 the frequency-controlled pump 18 and the control valve 17 are each controlled or regulated by the control device 20.

Bei beiden Ausführungsformen der Sprüheinrichtung 10 gemäß der Fig. 2 und Fig. 3 kann vorgesehen sein, dass zumindest ein Rollenelement 9 des Rollgangs 8 mit einem motorischen Antrieb M ausgestattet ist. Entsprechend ist dieses angetriebene Rollenelement in den Darstellungen von Fig. 2 und Fig. 3 jeweils mit "9(M)" bezeichnet. Dieses angetriebene Rollenelement 9(M) steht ebenfalls mit der Steuereinrichtung 20 in Signalverbindung, wie es beispielsweise in der Fig. 3 durch die Punktlinie symbolisiert ist, und kann entsprechend mittels der Steuereinrichtung 20 angesteuert werden.In both embodiments of the spray device 10 according to Fig. 2 and Fig. 3 It can be provided that at least one roller element 9 of the roller table 8 is equipped with a motor drive M. Accordingly, this driven roller element is shown in the illustrations Fig. 2 and Fig. 3 each labeled "9(M)". This driven roller element 9 (M) is also in signal connection with the control device 20, as shown, for example, in the Fig. 3 is symbolized by the dotted line and can be controlled accordingly by means of the control device 20.

Die Erfindung funktioniert nun wie folgt:The invention now works as follows:

Im Betrieb der Stranggießanlage 100 wird zunächst ein metallisches Produkt 1 in Form eines Gießstrangs 2 erzeugt, der nach dem Verlassen der Kokille zunächst durch die stützende Strangführung hindurch und nach dem Überführen in die Horizontale auf dem Rollgang 8 weiter in der Transportrichtung T bewegt wird. Hierbei kann vorgesehen sein, dass die Oberflächen des Gießstrangs 2 mittels der Reinigungseinrichtung 22 gereinigt werden, beispielsweise durch Ausbringen von Wasser unter hohem Druck.During operation of the continuous casting system 100, a metallic product 1 is first produced in the form of a casting strand 2, which, after leaving the mold, first passes through the supporting strand guide and, after being transferred to the horizontal on the roller table 8, is moved further in the transport direction T. It can be provided here that the surfaces of the casting strand 2 are cleaned by means of the cleaning device 22, for example by applying water under high pressure.

Bei seiner Bewegung auf dem Rollgang 8 durchläuft das metallische Produkt 1 auch den Behandlungsabschnitt 12 der Sprüheinrichtung 10. Eine thermische Oberflächenbehandlung für das metallische Produkt 1 erfolgt dadurch, dass Kühlfluid 16 durch die Kühldüsen der ersten Gruppe 16.1 und der zweiten Gruppe 16.2 gezielt auf die Oberflächen des metallischen Produkts 1 ausgebracht wird.As it moves on the roller table 8, the metallic product 1 also passes through the treatment section 12 of the spray device 10. A thermal surface treatment for the metallic product 1 is carried out in that cooling fluid 16 is directed onto the surfaces through the cooling nozzles of the first group 16.1 and the second group 16.2 of the metallic product 1 is applied.

Bei dem metallischen Produkt 1 kann es sich um einen Gießstrang 2 handeln, der noch nicht vereinzelt worden ist und entsprechend ein Endlos-Profil darstellt. Dies ist in der Darstellung von Fig. 4 veranschaulicht, in der ein solcher Endlos-Gießstrang 2 auf dem Rollgang 8 in der Transportrichtung T bewegt wird.The metallic product 1 can be a casting strand 2 that has not yet been separated and accordingly represents an endless profile. This is in the representation of Fig. 4 illustrated, in which such an endless casting strand 2 is moved on the roller table 8 in the transport direction T.

Die thermische Oberflächenbehandlung des Gießstrangs 2 innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 kann derart erfolgen, dass aus den Kühldüsen 16 der ersten Gruppe 16.1 Kühlfluid mit einer größeren Menge und/oder einen größeren Druck auf die Oberflächen des Gießstrangs 2 ausgebracht wird als im Vergleich aus den Kühldüsen 16 der zweiten Gruppe 16.2. Dies hat dann zur Folge, dass der nacheilende hintere Abschnitt 5 des Gießstrangs 2 innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 stärker gekühlt wird als dessen vorderer Abschnitt 4. Mit dieser Kühlstrategie wird das Ergebnis erreicht, dass in dem Material des Gießstrangs 2 in einer vorbestimmten Tiefe hiervon über einen Längenbereich, der sich zwischen dem vorderen Abschnitt 4 und dem hinteren Abschnitt 5 erstreckt, sich ein im Wesentlichen gleichmäßiger Ferrit-Anteil einstellt.The thermal surface treatment of the casting strand 2 within the treatment section 12 of the spray device 10 can be carried out in such a way that cooling fluid is applied to the surfaces of the casting strand 2 from the cooling nozzles 16 of the first group 16.1 with a larger amount and/or a greater pressure than in the comparison from the Cooling nozzles 16 of the second group 16.2. This then has the consequence that the trailing rear section 5 of the casting strand 2 within the treatment section 12 of the spray device 10 is cooled more strongly than its front section 4. With this cooling strategy the result is achieved that in the material of the casting strand 2 at a predetermined depth of this, over a length range that extends between the front section 4 and the rear section 5, a substantially uniform ferrite proportion is established.

Im Zuge der vorliegenden Erfindung ist innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 eine thermische Oberflächenbehandlung auch für eine vereinzelte Bramme 3 möglich, die zuvor aus dem Gießstrang 2 gebildet worden ist. Hierbei wird der Gießstrang 2, bevor er auf dem Rollgang 8 die Sprüheinrichtung 10 erreicht, mittels der Schere S vereinzelt, so dass dann eine entsprechend vereinzelte Bramme 3 in den Behandlungsabschnitt 12 der Sprüheinrichtung 10 bzw. deren Gehäuse G einläuft.In the course of the present invention, thermal surface treatment is also possible for an isolated slab 3, which has previously been formed from the casting strand 2, within the treatment section 12 of the spray device 10. Here, the casting strand 2 is separated by means of the scissors S before it reaches the spray device 10 on the roller table 8, so that a correspondingly separated slab 3 then enters the treatment section 12 of the spray device 10 or its housing G.

Ein Bewegen der vereinzelten Bramme 3 innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 in der Transportrichtung T kann durch das angetriebene Rollenelement 9(M) erreicht werden. Dies ist beispielsweise in der Darstellung von Fig. 5 veranschaulicht.Moving the separated slab 3 within the treatment section 12 of the spraying device 10 in the transport direction T can be achieved by the driven roller element 9 (M). This is, for example, in the representation of Fig. 5 illustrated.

Auch für den Fall, dass ein metallisches Produkt 1 in Form einer bereits vereinzelten Bramme 3 in der Sprüheinrichtung 10 einer thermischen Oberflächenbehandlung unterzogen wird, kann die vorstehend bereits erläuterten Kühlstrategie verfolgt werden, wonach ein hinterer Abschnitt 5 der Bramme 3 stärker gekühlt wird als der vorderer Abschnitt 4 hiervon. Dies kann dadurch erreicht werden, dass, wie bereits erläutert, aus den Kühldüsen 16 der ersten Gruppe 16.1 Kühlfluid mit größerer Menge und/oder größerem Druck auf die Oberflächen der Bramme 3 ausgebracht wird als im Vergleich aus den Kühldüsen 16 der zweiten Gruppe 16.2. Ergänzend oder alternativ kann diese Kühlstrategie dadurch erreicht werden, dass die vereinzelte Bramme 3 derart in den Behandlungsabschnitt 12 der Sprüheinrichtung 10 bzw. in deren Gehäuse G hinein bewegt wird, dass der vorderer Abschnitt 4 der Bramme 3 schneller an den Kühldüsen 16 vorbeitritt als der nacheilende hintere Abschnitt 5 der Bramme 5. Dies kann mit einer geeigneten Ansteuerung des angetriebenen Rollenelements 9(M) durch die Steuereinrichtung 20 erreicht werden.Even in the event that a metallic product 1 in the form of an already separated slab 3 is subjected to a thermal surface treatment in the spray device 10, the cooling strategy already explained above can be pursued, according to which a rear section 5 of the slab 3 is cooled more strongly than the front one Section 4 hereof. This can be achieved by, as already explained, cooling fluid being applied to the surfaces of the slab 3 from the cooling nozzles 16 of the first group 16.1 with a larger quantity and/or greater pressure than from the cooling nozzles 16 of the second group 16.2. Additionally or alternatively, this cooling strategy can be achieved by moving the isolated slab 3 into the treatment section 12 of the spray device 10 or into its housing G in such a way that the front section 4 of the slab 3 passes the cooling nozzles 16 faster than the trailing one rear section 5 of the slab 5. This can be achieved with a suitable control of the driven roller element 9 (M) by the control device 20.

In den Fig. 6 und 7 sind weitere Merkmale für die erfindungsgemäße Sprüheinrichtung 10 gezeigt und erläutert, die bei allen der vorstehend bereits genannten Ausführungsformen realisiert sein können.In the 6 and 7 Further features for the spray device 10 according to the invention are shown and explained, which can be implemented in all of the embodiments already mentioned above.

Fig. 6 zeigt in einer vereinfachten Perspektivdarstellung einen Schnellwechselrahmen 24, in dem eine Gruppe von Kühldüsen 16 angeordnet sind. Eine Leitung 17 für Kühlfluid führt seitlich in einen solchen Schnellwechselrahmen 24 hinein und ist mit Spritzrohren verbunden, an denen die einzelnen Kühldüsen 16 angebracht sind. Wie vorstehend bereits erläutert, ist die Leitung 17 an eine frequenzgeregelte Pumpe 18 angeschlossen, um dadurch die Kühldüsen 16 mit Kühlfluid zu speisen. Fig. 6 shows a simplified perspective view of a quick-change frame 24 in which a group of cooling nozzles 16 are arranged. A line 17 for cooling fluid leads laterally into such a quick-change frame 24 and is connected to spray pipes to which the individual cooling nozzles 16 are attached. As already explained above, the line 17 is connected to a frequency-controlled pump 18 in order to thereby supply the cooling nozzles 16 with cooling fluid.

Die Perspektivdarstellung von Fig. 6 verdeutlicht, dass der Schnellwechselrahmen 24 im Querschnitt in Form eines Rechteck-Profils ausgebildet ist, das eine mittige Öffnung umschließt. Diesbezüglich ist zu verstehen, dass sich der Rollgang 8, der zur Vereinfachung in der Fig. 6 nicht gezeigt ist, durch diese mittige Öffnung hindurch erstreckt. Somit können die Oberseite 6 und die Unterseite 7 des metallischen Produkts 1 mit Kühlfluid beaufschlagt werden, wenn dieses Kühlfluid durch die Kühldüsen 16 in Richtung des metallischen Produkts 1 ausgebracht wird.The perspective representation of Fig. 6 clarifies that the quick-change frame 24 is designed in cross section in the form of a rectangular profile that encloses a central opening. In this regard, it should be understood that the roller table 8, which is in the for simplification Fig. 6 is not shown, extends through this central opening. Thus, the top 6 and the bottom 7 of the metallic product 1 can be supplied with cooling fluid when this cooling fluid is discharged through the cooling nozzles 16 in the direction of the metallic product 1.

Der Schnellwechselrahmen 24 ist mit einer Höhenverstelleinrichtung H ausgestattet. Diese Höhenverstelleinrichtung H wirkt auf die Spritzrohre, die oberhalb des Rollgangs 8 angeordnet sind. Entsprechend ist es mit einer Betätigung dieser Höhenverstelleinrichtung H möglich, den Abstand der Kühldüsen 16, die oberhalb des metallischen Produkts 1 angeordnet sind, relativ zur Oberseite 6 des metallischen Produkts 1 zu verändern.The quick-change frame 24 is equipped with a height adjustment device H. This height adjustment device H acts on the spray pipes, which are arranged above the roller table 8. Accordingly, by activating this height adjustment device H, it is possible to change the distance between the cooling nozzles 16, which are arranged above the metallic product 1, relative to the top side 6 of the metallic product 1.

In Bezug auf einen Schnellwechselrahmen 24 gemäß Fig. 6 darf an dieser Stelle gesondert darauf hingewiesen werden, dass dieser für die Kühldüsen 16 der ersten Gruppe 16.1 als auch für die Kühldüsen 16 der zweiten Gruppe 16.2 eingesetzt werden kann. Dies bedeutet, dass dann bei den Ausführungsformen gemäß Fig. 2 und Fig. 3 insgesamt zwei Schnellwechselrahmen 24 zum Einsatz kommen, nämlich einerseits für die Kühldüsen 16 der ersten Gruppe 16.1 und andererseits für die Kühldüsen 16 der zweiten Gruppe 16.2.With regard to a quick-change frame 24 according to Fig. 6 It should be pointed out separately at this point that this applies to the cooling nozzles 16 of the first group 16.1 as well as to the cooling nozzles 16 of the second group 16.2 can be used. This means that in the embodiments according to Fig. 2 and Fig. 3 A total of two quick-change frames 24 are used, namely on the one hand for the cooling nozzles 16 of the first group 16.1 and on the other hand for the cooling nozzles 16 of the second group 16.2.

Fig. 7 zeigt eine perspektivische Ansicht der Sprüheinrichtung 10 gemäß einer weiteren Ausführungsform, bei der - in der Transportrichtung T des metallischen Produkts gesehen - insgesamt drei Gruppen von Kühldüsen 16 angeordnet sind. Neben den bereits genannten Gruppen 16.1 und 16.2 ist nun auch eine dritte Gruppe 16.3 von Kühldüsen 16 vorgesehen, die - in der Transportrichtung T des metallischen Produkts gesehen - stromabwärts von der zweiten Gruppe 16.2 angeordnet ist. Fig. 7 shows a perspective view of the spray device 10 according to a further embodiment, in which - seen in the transport direction T of the metallic product - a total of three groups of cooling nozzles 16 are arranged. In addition to the groups 16.1 and 16.2 already mentioned, a third group 16.3 of cooling nozzles 16 is now also provided, which - viewed in the transport direction T of the metallic product - is arranged downstream of the second group 16.2.

Für die dritte Gruppe 16.3 von Kühldüsen 16 versteht sich, dass hierzu auch ein Schnellwechselrahmen 24 gemäß Fig. 6 verwendet werden kann, um damit die Kühldüsen 16 oberhalb und unterhalb des metallischen Produkts 1 anzuordnen.For the third group 16.3 of cooling nozzles 16, it goes without saying that a quick-change frame 24 is also required for this purpose Fig. 6 can be used to arrange the cooling nozzles 16 above and below the metallic product 1.

Bei der Ausführungsform von Fig. 7, bei der wie soeben erläutert insgesamt drei Gruppen von Kühldüsen 16 vorgesehen sind, versteht sich, dass hierbei aus den Kühldüsen 16 der dritten Gruppe 16.3 Kühlfluid mit einer kleineren Menge und/oder einem kleineren Druck ausgebracht wird als aus den Kühldüsen 16 der zweiten Gruppe 16.2. Anders ausgedrückt, werden die Menge des aus den Kühldüsen 16 ausgebrachten Kühlfluids und/oder dessen Druck für die drei Gruppen 16.1, 16.2 und 16.3, in dieser Reihenfolge, entlang der Transportrichtung T stetig vermindert.In the embodiment of Fig. 7 , in which, as just explained, a total of three groups of cooling nozzles 16 are provided, it goes without saying that cooling fluid is discharged from the cooling nozzles 16 of the third group 16.3 with a smaller amount and/or a smaller pressure than from the cooling nozzles 16 of the second group 16.2 . In other words, the amount of cooling fluid discharged from the cooling nozzles 16 and/or its pressure for the three groups 16.1, 16.2 and 16.3, in this order, are continuously reduced along the transport direction T.

In Bezug auf die dritte Gruppe 16.3 von Kühldüsen 16 kann vorgesehen sein, dass diese dem vorderen Abschnitt 4 des metallischen Produkts 1 zugeordnet ist. Entsprechend befinden sich dann die Kühldüsen 16 der zweiten Gruppe 16.2 in etwa in einem Bereich zwischen dem vorderen Abschnitt 4 und dem hinteren Abschnitt 5 des metallischen Produkts 1.With regard to the third group 16.3 of cooling nozzles 16, it can be provided that this is assigned to the front section 4 of the metallic product 1. Correspondingly, the cooling nozzles 16 of the second group 16.2 are then located approximately in an area between the front section 4 and the rear section 5 of the metallic product 1.

Die Positionierung der Schnellwechselrahmen 24 entlang des Rollgangs 8 erfolgt in der Weise, dass diese in das Gehäuse G der Sprüheinrichtung 10 integriert sind und sich hierdurch zumindest im Bereich des Behandlungsabschnitts 12 der Sprüheinrichtung 10 eine geschlossene Gehäusekammer K ausgebildet. Im oberen Bereich dieser Gehäusekammer K ist ein Deckel vorgesehen, der in der Darstellung von Fig. 7 mit der Bezeichnung "D" versehen ist.The quick-change frames 24 are positioned along the roller table 8 in such a way that they are integrated into the housing G of the spray device 10 and thereby a closed housing chamber K is formed at least in the area of the treatment section 12 of the spray device 10. In the upper area of this housing chamber K a cover is provided, which is shown in the illustration Fig. 7 marked with the designation “D”.

Im Hinblick auf die vorstehend genannte geschlossene Gehäusekammer K versteht sich, dass der Einlaufbereich 14 und der Auslaufbereich 15 der Gehäusekammer K jeweils mit einer Schleusenfunktion ausgestattet sind, um ein Einlaufen des metallischen Produkts 1 hinein in die Gehäusekammer K bzw. ein Herauslaufen des metallischen Produkts 1 heraus aus der Gehäusekammer K zu gewährleisten.With regard to the above-mentioned closed housing chamber K, it is understood that the inlet area 14 and the outlet area 15 of the housing chamber K are each equipped with a lock function in order to prevent the metallic product 1 from entering into the housing chamber K or the metallic product 1 from running out out of the housing chamber K to ensure.

In Bezug auf die einzelnen Gruppen von Kühldüsen 16 darf an dieser Stelle gesondert darauf hingewiesen werden, dass - in der Transportrichtung T gesehen - ein Abstand dieser Gruppen relativ zueinander einstellbar verändert werden kann. Dies gilt in gleicher Weise sowohl für die Ausführungsform von Fig. 2 und Fig. 3, bei denen jeweils eine erste Gruppe 16.1 und eine zweite Gruppe 16.2 von Kühldüsen 16 vorgesehen sind, als auch für die Ausführungsform von Fig. 7, bei der für die Kühldüsen 16 insgesamt drei Gruppen 16.1, 16.2 und 16.3 vorgesehen sind. Eine solche Verstellung eines Abstands der Gruppen von Kühldüsen 16 lässt sich in einfacher Weise realisieren, wenn für diese Gruppen, wie erläutert, jeweils ein Schnellwechselrahmen 24 gemäß Fig. 6 verwendet wird.With regard to the individual groups of cooling nozzles 16, it should be pointed out separately at this point that - seen in the transport direction T - a distance between these groups can be adjusted in relation to one another. This applies equally to both the embodiment of Fig. 2 and Fig. 3 , in each of which a first group 16.1 and a second group 16.2 of cooling nozzles 16 are provided, as well as for the embodiment of Fig. 7 , in which a total of three groups 16.1, 16.2 and 16.3 are provided for the cooling nozzles 16. Such an adjustment of a distance between the groups of cooling nozzles 16 can be implemented in a simple manner if, as explained, a quick-change frame 24 is used for each of these groups Fig. 6 is used.

Bei allen der vorstehend genannten Ausführungsformen der erfindungsgemäßen Sprüheinrichtung 10 das Gehäuse G mit einer (nicht gezeigten) Wasserdampfabsaugrichtung ausgestattet sein kann. Somit ist es möglich, dass Wasserdampf, der sich innerhalb der geschlossenen Gehäusekammer K bilden kann, wenn ein metallisches Produkt 1 innerhalb des Behandlungsabschnitts 12 der Sprüheinrichtung 10 einer thermischen Oberflächenbehandlung unterzogen wird, geeignet mittels dieser Wasserdampfabsaugrichtung abgesaugt wird.In all of the above-mentioned embodiments of the spray device 10 according to the invention, the housing G can be equipped with a water vapor suction direction (not shown). It is therefore possible that water vapor, which can form within the closed housing chamber K when a metallic product 1 is inside the treatment section 12 of the Spray device 10 is subjected to a thermal surface treatment, is suctioned off suitably by means of this water vapor suction direction.

Weitere Merkmale zur Durchführung eines erfindungsgemäßen Verfahrens zur thermischen Oberflächenbehandlung sind in dem Flussdiagramm von Fig. 8 genannt. In Bezug auf die Sprüheinrichtung 10 darf hierzu hervorgehoben werden, dass ein definierter Wärmeentzug für das metallische Produkt 1 durch eine regelbare Wassermenge erreicht werden kann. Im Falle der Behandlung einer vereinzelten Bramme 3 kann dies auch mittels einer regelbaren Transportgeschwindigkeit erreicht werden, mit der die Bramme 3 in den Behandlungsabschnitt 12 der Sprüheinrichtung 10 hineinbewegt und dabei an den Kühldüsen 16 vorbeibewegt wird.Further features for carrying out a method according to the invention for thermal surface treatment are in the flow chart of Fig. 8 called. With regard to the spray device 10, it should be emphasized that a defined heat removal for the metallic product 1 can be achieved using an adjustable amount of water. In the case of treating an isolated slab 3, this can also be achieved by means of an adjustable transport speed with which the slab 3 is moved into the treatment section 12 of the spray device 10 and thereby moved past the cooling nozzles 16.

Des Weiteren verdeutlicht das Flussdiagramm von Fig. 8, dass es mittels einzelner Prozessparameter, zu denen die Geometrie, die gemessene Temperatur des metallischen Produkts 1 innerhalb der Sprüheinrichtung 10 in deren Einlaufbereich 14 und/oder Auslaufbereich 15 und/oder die stromabwärts der Sprüheinrichtung 10 gemessene Oberflächengüte des metallischen Produkts 1 zählen können, möglich ist, eine automatisierte Prozessführung zu realisieren, die Einfluss auf den Betrieb der Stranggießanlage 100 hat.Furthermore, the flowchart from Fig. 8 that it is possible by means of individual process parameters, which can include the geometry, the measured temperature of the metallic product 1 within the spray device 10 in its inlet area 14 and/or outlet area 15 and/or the surface quality of the metallic product 1 measured downstream of the spray device 10 is to implement automated process control that influences the operation of the continuous casting plant 100.

BezugszeichenlisteReference symbol list

11
metallisches Produktmetallic product
22
Gießstrangcasting strand
33
BrammeBram
44
vorderer Abschnitt (des metallischen Produkts 1)front section (of metallic product 1)
55
nacheilender hintere Abschnitt (des metallischen Produkts 1)lagging rear section (of metallic product 1)
66
Oberseite (des metallischen Produkts 1)Top (of metallic product 1)
77
Unterseite (des metallischen Produkts 1)Bottom (of metallic product 1)
88th
RollgangRoller table
99
RollenelementRole element
1010
SprüheinrichtungSpray device
1212
BehandlungsabschnittTreatment section
1313
Temperatur-MesseinrichtungTemperature measuring device
1414
EinlaufbereichInlet area
1515
AuslaufbereichRun-out area
1616
KühldüsenCooling nozzles
16.116.1
erste Gruppe von Kühldüsen 16first group of cooling nozzles 16
16.216.2
zweite Gruppe von Kühldüsen 16second group of cooling nozzles 16
16.316.3
dritte Gruppe von Kühldüsen 16third group of cooling nozzles 16
1717
LeitungLine
1818
frequenzgeregelte Pumpefrequency-controlled pump
1919
Stellventilcontrol valve
2020
SteuereinrichtungControl device
2222
Reinigungseinrichtung (z.B. Entzunderer)Cleaning device (e.g. descaler)
2424
SchnellwechselrahmenQuick change frame
100100
StranggießanlageContinuous casting plant
DD
DeckelLid
GG
GehäuseHousing
HH
HöhenverstelleinrichtungHeight adjustment device
KK
GehäusekammerHousing chamber
MM
motorischer Antrieb (für ein Rollenelement)motor drive (for a roller element)
RR
SpritzrohreSpray pipes
SS
SchereScissors
TT
TransportrichtungTransport direction
vv
Transportgeschwindigkeit (der Bramme 3)Transport speed (of slab 3)

Claims (32)

  1. Method for thermal surface treatment of a metallic product (1), particularly in the form of a cast strip (2) or a slab (3) formed therefrom, in which the metallic product (1) is moved in a transport direction (T) through a treatment section (12), which is equipped with cooling nozzles (16), of a spray device (10) and in that case cooling fluid is applied by the cooling nozzles (16) of the spray device (10) to the surfaces of the metallic product (1), wherein the metallic product (1) as seen in the transport direction (T) of the metallic product (1) has a front section (4) and a trailing rear section (5),
    characterised in that
    the rear section (5) of the metallic product (1) is more strongly cooled than the front section (4) of the metallic product (1) in such a way that by virtue of the heat extraction by means of the cooling fluid applied to the surfaces of the metallic product (1) a substantially more uniform ferrite proportion arises in the material of the metallic product (1) to a predetermined depth thereof over a length region extending between the front section (4) and the rear section (5) of the metallic product (1).
  2. Method according to claim 1, characterised in that a plurality of cooling nozzles (16) is arranged in the treatment section (12) of the spray device (10) above the metallic product (1) and/or below the metallic product (1) along the transport direction (T) of the metallic product (1), wherein cooling fluid particularly in the form of or on the basis of water is sprayed under pressure from each of the cooling nozzles (16) onto the surface of the metallic product (1).
  3. Method according to claim 2, characterised in that the cooling nozzles (16) are arranged at least in a first group (16.1) and a second group (16.2), wherein the second group (16.2) of the cooling nozzles (16) as seen in the transport direction (T) of the metallic product (1) are arranged downstream of the first group (16.1) of the cooling nozzles (16).
  4. Method according to claim 2 or 3, characterised in that the cooling nozzles (16) are for supply of a cooling fluid connected with at least one frequency-regulated pump (18) by which the cooling fluid is conveyed to the cooling nozzles (16) in a predetermined quantity and at a predetermined pressure.
  5. Method according to claim 4, characterised in that respective separate frequency-regulated pumps (18) are provided for the first group (16.1) and the second group (16.2) of the cooling nozzles (16).
  6. Method according to any one of claims 3 to 5, characterised in that at least one setting valve (19) by which with respect to the cooling fluid a water quantity and/or a pressure for the cooling nozzles (16) of the first or second group (16.1, 16.2) is settable is provided in a duct (17) between the frequency-regulated pump (18) and the cooling nozzles (16) of the first or second group (16.1, 16.2).
  7. Method according to claim 5 or 6, characterised in that the water quantity and/or the pressure for the cooling fluid is or are selected to be greater for the cooling nozzles (16) of the first group (16.1) than for the cooling nozzles (16) of the second group (16.2) so that the rear section (5) of the metallic product (1) is thereby more strongly cooled than its front section (4).
  8. Method according to any one of the preceding claims, characterised in that the metallic product (1) as seen in its transport direction (T) is cut upstream of the spray device (10) and thus is separated to form a slab (3).
  9. Method according to claim 8, characterised in that the transport speed (v) of the slab (3) is changed in the treatment section (12) of the spray device (10) in such a way that the front section (4) of the slab (3) is moved more quickly past the cooling nozzles (16) than the rear section (5) of the slab (3).
  10. Method according to any one of the preceding claims, characterised in that the metallic product (1) as seen in its transport direction (1) is cleaned, preferably descaled, upstream of the spray device (10).
  11. Method according to any one of the preceding claims, characterised in that the temperature of the metallic product (1) as seen in its transport direction is measured upstream of the spray device (10).
  12. Method according to any one of the preceding claims, characterised in that the temperature of the metallic product (1) as seen in its transport direction is measured downstream of the spray device (10).
  13. Method according to claim 11 or 12, characterised in that the temperature of the metallic product (1) is measured at its upper side (6).
  14. Method according to any one of claims 11 to 13, characterised in that the temperature of the metallic product (1) is measured at its lower side (7).
  15. Method according to any one of claims 11 to 14, characterised in that the quantity of cooling fluid delivered from the cooling nozzles (16) of the spray device (10) to the surfaces of the metallic product (1) is set or regulated in dependence on the measured temperature of the metallic product (1).
  16. Method according to any one of claims 11 to 15 insofar as dependent on claim 9, characterised in that the transport speed (v) of the slab (3) or the change in this transport speed (v) is set or regulated within the treatment section (12) of the spray device (10) in dependence on the measured temperature of the metallic product (1).
  17. Method according to any one of the preceding claims, characterised in that the surface quality of the metallic product (1) is measured with respect to the proportion of ferrite component downstream of the spray device (10) as seen in the transport direction (T) of the metallic product (1), wherein the quantity of cooling fluid delivered from the cooling nozzles (16) of the spray device (10) to the surfaces of the metallic product (1) and/or the pressure thereof and/or the transport speed of the slab (3) or the change in this transport speed (v) is or are set or regulated along the treatment section (12) of the spray device (10) in dependence on the measured proportion of ferrite.
  18. Method according to any one of claims 2 to 17, characterised in that the cooling nozzles (16) are arranged along the treatment section (12) of the spray device (10) not only above the metallic product (1), but also below the metallic product (1), wherein the water quantity and/or the pressure for the cooling nozzles (16) below the metallic product (1) is or are selected to be greater than for the cooling nozzles (16) above the metallic product (1), preferably in that the cooling nozzles (16) arranged below the metallic product (1) and the cooling nozzles (16) arranged above the metallic product (1) are connected with pumps (18) with respectively different frequency regulation.
  19. Method according to any one of the preceding claims, characterised in that the thickness of the metallic product (1) is at least 250 mm and/or a width of the metallic product (1) is at least 3000 mm.
  20. Method according to any one of the preceding claims, characterised in that the cooling fluid is delivered from the cooling nozzles (16) to the surfaces of the metallic product (1) intermittently.
  21. Spray device (10) for thermal surface treatment of a metallic product (1), particularly in the form of a cast strip (2) or a slab (3) formed therefrom, for performing the method according to any one of claims 1 to 20, comprising
    a treatment section (12) with an inlet region (14) and an outlet region (15), wherein the metallic product (1) is movable in a transport direction (T) along the treatment section (12) from the inlet region (14) in the direction of the outlet region (15) and
    a plurality of cooling nozzles (16), from each of which a cooling fluid can be delivered to the surfaces of the metallic product (1),
    characterised in that
    the cooling nozzles (16) are arranged at least in a first group (16.1) and a second group (16.2), wherein the second group (16.2) of the cooling nozzles (16) as seen in the transport direction (T) of the metallic product (1) is arranged downstream of the first group (16.1) of the cooking nozzles (16), and
    the cooling nozzles (16) of the first group (16.1) and the cooling nozzles (16) of the second group (16.2) are respectively connected with separate frequency-regulated pumps (18), wherein with respect to the cooling fluid a predetermined quantity and/or a predetermined pressure for the cooling nozzles (16) of the first group (16.1) or for the cooling nozzles (16) of the second group (16.2) is settable, preferably regulable, by the respective frequency-regulated pumps (18).
  22. Spray device (10) for thermal surface treatment of a metallic product (1), particularly in the form of a cast strip (2) or a slab (3) formed therefrom, for performing the method according to any one of claims 1 to 20, comprising
    a treatment section (12) with an inlet region (14) and an outlet region (15), wherein the metallic product (1) is movable in a transport direction (T) along the treatment section (12) from the inlet region (14) in the direction of the outlet region (15) and
    a plurality of cooling nozzles (16), from each of which a cooling fluid can be delivered to the surfaces of the metallic product (1),
    characterised in that
    the cooling nozzles (16) are arranged at least in a first group (16.1) and a second group (16.2), wherein the second group (16.2) of the cooling nozzles (16) as seen in the transport direction (T) of the metallic product (1) is arranged downstream of the first group (16.1) of the cooking nozzles (16), and
    the cooling nozzles (16) of the first group (16.1) and the cooling nozzles (16) of the second group (16.2) are connected with at least one frequency-regulated pump (18) and at least one setting valve (19) by which with respect to the cooling fluid a water quantity and/or a pressure for the cooling nozzles (16) of the first or second group (16.1, 16.2) is or are settable, preferably regulable, is provided in a duct (17) between the frequency-regulated pump (18) and the cooling nozzles (16) of the first or second group (16.1, 16.2).
  23. Spray device (10) according to claim 21 or claim 22, characterised by a control device (20) by which the frequency-regulated pump or pumps (18) and/or the setting valve (19) is or are in signal connection in such a way that the operation of this pump or these pumps (18) and/or the setting valve (19) is controllable, preferably regulable, in dependence on at least one process parameter of the metallic product (1).
  24. Spray device (10) according to any one of claims 21 to 23, characterised in that the metallic product is movable in the transport direction (T) along the treatment section (12) on a roller path (8) from the inlet region (14) to in the direction of the outlet region (15), wherein at least one roller element (9) of the roller path (8) is equipped with a motorised drive (M), preferably in that the roller element (9) equipped with the motorised drive (M) is arranged adjacent to the treatment section (12).
  25. Spray device (10) according to any one of claims 21 to 24, characterised in that the first group (16.1) of cooling nozzles (16) and the second group (16.2) of cooling nozzles (16) are respectively arranged in separate quick-change frames (24).
  26. Spray device (10) according to any one of claims 21 to 25, characterised in that a spacing of the first group (16.1) of cooling nozzles (16) and the second group (16.2) of cooling nozzles (16) relative to one another in the transport direction (T) of the metallic product (1) is adjustable to be variable.
  27. Spray device (10) for thermal surface treatment of a metallic product (1) in the form of a separated slab (3), for performance of the method according to any one of claims 1 to 20, comprising
    a treatment section (12) with an inlet region (14) and an outlet region (15), wherein the metallic product (1) is movable in a transport direction (T) along the treatment section (12) on a roller path (8) from the inlet region (14) in the direction of the outlet region (15) and
    a plurality of cooling nozzles (16), from each of which a cooling fluid can be delivered to the surfaces of the metallic product (1),
    characterised in that
    at least one roller element (9) of the roller path (8) is equipped with a motorised drive (M), preferably in that the roller element (9) equipped with the motorised drive (M) is arranged adjacent to the treatment section (12).
  28. Spray device (10) according to claim 27, characterised in that a control device (20) is provided, with which the motorised drive (M) of the roller element (9) is in signal connection in such a way that the rotational speed or the circumferential speed of the roller element (9) is controllable, preferably regulable, in dependence on at least one process parameter of the metallic product (1).
  29. Spray device (10) according to claim 23 or 27, characterised in that the at least one process parameter of the metallic product (1) is selected from the group consisting of temperature, ferrite proportion in the material of the metallic product (1) and/or geometry of the metallic product (1), particularly with respect to its cross-section perpendicularly to the transport direction (T).
  30. Spray device (10) according to any one of claims 21 to 29, characterised by a housing (G) in which the treatment section (12) is provided, preferably in that the housing is equipped with a water-steam suction device, further preferably that the housing (G) is constructed in the form of a chamber (K) and is substantially closed, wherein the inlet region (14) and the outlet region (15) of the housing chamber (K) are each furnished with gate function so as to ensure running of the metallic product into the housing chamber (K) or running of the metallic product (1) out of the housing chamber (K).
  31. Spray device (10) according to any one of claims 27 to 30, characterised in that the cooling nozzles (16) are arranged in at least one quick-change frame (24).
  32. Spray device (10) according to any one of claims 21 to 31, characterised by a height adjusting device (H) by which cooling nozzles (16) arranged at an upper side (6) of the metallic product (1) are arranged to be adjustable in their height so that a spacing of these cooling nozzles (16) relative to the roller path (8) is thereby settable.
EP21772737.9A 2020-09-18 2021-08-31 Method and spraying apparatus for thermal surface treatment of a metal product Active EP4214010B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020211720.9A DE102020211720A1 (en) 2020-09-18 2020-09-18 Process and spray device for the thermal surface treatment of a metallic product
PCT/EP2021/073941 WO2022058152A1 (en) 2020-09-18 2021-08-31 Method and spraying apparatus for thermal surface treatment of a metal product

Publications (2)

Publication Number Publication Date
EP4214010A1 EP4214010A1 (en) 2023-07-26
EP4214010B1 true EP4214010B1 (en) 2024-02-28

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Application Number Title Priority Date Filing Date
EP21772737.9A Active EP4214010B1 (en) 2020-09-18 2021-08-31 Method and spraying apparatus for thermal surface treatment of a metal product

Country Status (4)

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US (1) US20230330743A1 (en)
EP (1) EP4214010B1 (en)
DE (1) DE102020211720A1 (en)
WO (1) WO2022058152A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115846424B (en) * 2022-11-15 2023-07-28 郑州大学 Temperature control device and process for high-flux continuous casting and rolling aluminum alloy plate

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE222152T1 (en) 1993-10-29 2002-08-15 Danieli Off Mecc METHOD AND DEVICE FOR THERMAL SURFACE TREATMENT OF A STRAND
US5810951A (en) 1995-06-07 1998-09-22 Ipsco Enterprises Inc. Steckel mill/on-line accelerated cooling combination
AU4596899A (en) * 1998-07-10 2000-02-01 Ipsco Inc. Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling
DE102010052247A1 (en) * 2010-11-23 2012-05-24 Sms Siemag Ag Apparatus and method for controlled secondary cooling of a continuous casting plant
DE102015223788A1 (en) * 2015-11-30 2017-06-01 Sms Group Gmbh Method of continuous casting of a metal strand and cast strand obtained by this method

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WO2022058152A1 (en) 2022-03-24
US20230330743A1 (en) 2023-10-19
DE102020211720A1 (en) 2022-03-24
EP4214010A1 (en) 2023-07-26

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