EP4337402A1 - Dispositif de transport, procédé de fonctionnement d'un dispositif de transport et utilisation d'un dispositif de transport - Google Patents

Dispositif de transport, procédé de fonctionnement d'un dispositif de transport et utilisation d'un dispositif de transport

Info

Publication number
EP4337402A1
EP4337402A1 EP22762109.1A EP22762109A EP4337402A1 EP 4337402 A1 EP4337402 A1 EP 4337402A1 EP 22762109 A EP22762109 A EP 22762109A EP 4337402 A1 EP4337402 A1 EP 4337402A1
Authority
EP
European Patent Office
Prior art keywords
slab
equal
transport device
proportion
furnace
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.)
Pending
Application number
EP22762109.1A
Other languages
German (de)
English (en)
Inventor
Hans Ferkel
Markus Reifferscheid
Thomas Henkel
Ingo Schuster
Volker Wiegmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP4337402A1 publication Critical patent/EP4337402A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • 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
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • Hot strip is an economically important intermediate product in steel production.
  • slabs are formed into hot strip by hot rolling at a temperature above the temperature at which nitrite precipitates of the underlying steel are dissolved.
  • the slabs used are allowed to cool in a slab store and then subjected to a surface inspection. This inspection can be carried out completely or only partially on representative slabs from a melt.
  • the inspected and, if necessary, repaired slabs are then assembled into rolling programs, heated in a furnace in the pre-planned sequence to a temperature above the temperature at which nitrite precipitations of the underlying steel are dissolved, and fed to a hot rolling mill.
  • the manufacturing process of the slabs and the further processing into hot strip are separated in terms of time and can also take place at different locations.
  • the object of the invention is to provide an improvement or an alternative to the prior art.
  • the task is solved by a transport device for slabs between a separating device for separating a slab from a cast strand and a furnace, the transport device having an electrically driven roller table, the slab having an ⁇ component and/or a ⁇ -Has share, wherein the transport device has a means for determining the ⁇ -share on a surface of the slab.
  • a “transport device” is understood to mean any system which is set up for transporting slabs, in particular for transporting slabs between a separating device for separating a slab from a cast strand and a furnace, in particular a reheating furnace.
  • a transport device on a roller table, in particular an electrically driven roller table.
  • the casting speed of a cast strand of a continuous casting installation usually has a value of less than or equal to 0.14 m/s, in particular a value of less than or equal to 0.1 m/s.
  • the transport device is preferably set up to pick up a cast strand and/or a slab at a speed corresponding to the casting speed.
  • a transport device is preferably set up to transport a slab at a speed of greater than or equal to 0.02 m/s in the direction of the furnace, preferably at a speed of greater than or equal to 1.0 m/s and particularly preferably at a speed of greater than or equal to 2.5 m/s or greater than or equal to 3.5 m/s.
  • the transport device is expediently set up to be used as part of an integrated steel works, having melt production and hot forming, in particular a hot rolling mill.
  • the transport device is preferably set up for the hot use and/or for the direct use of a slab that has been primary formed with a continuous casting plant in a furnace, in particular a reheating furnace.
  • a “slab” is a block of cast steel whose width and length are several times its thickness. Slabs are the starting material for sheet and strip, especially for hot strip.
  • a slab expediently has a weight of greater than or equal to 8 t, preferably greater than or equal to 10 t and particularly preferably greater than or equal to 15 t.
  • a slab optionally has a thickness of greater than or equal to 110 mm, preferably a thickness of greater than or equal to 150 mm, more preferably a thickness of greater than or equal to 180 mm and particularly preferably a thickness of greater than or equal to 220 mm.
  • a slab usually has a thickness of less than or equal to 300 mm.
  • the width of a slab is optionally greater than or equal to 0.9 m, preferably greater than or equal to 1.5 m and particularly preferably greater than or equal to 2.0 m.
  • the width of a slab is preferably greater than or equal to 2.5 m, preferred greater than or equal to 3.0 m, and more preferably greater than or equal to 4.0 m.
  • the greater the thickness of a slab and/or the width of a slab the smaller the ratio of the surface area of the slab to its volume becomes. The slab cools more slowly with increasing width and/or thickness. In addition, with a smaller surface area to volume ratio, less carbon per volume diffuses into the slab.
  • a “surface of the slab” is preferably understood to mean an area adjoining the geometric surface with a thickness of less than or equal to 5 mm, preferably an area with a thickness of less than or equal to 10 mm.
  • the "furnace”, often also referred to as a reheating unit in an integrated steelworks, is designed to heat a slab to a temperature greater than or equal to the temperature at which nitrite precipitates are dissolved in the steel composition of the slab, in particular to an average temperature of the Slab, which is between 950 °C and 1,280 °C depending on the alloy composition.
  • the furnace can be a walking beam furnace or a pusher furnace.
  • a temperature is preferably understood as meaning an average temperature in an area adjacent to the surface of the slab, in particular in an area with a thickness of less than or equal to 5 mm and preferably in an area of less than or equal to 10 mm.
  • a ⁇ proportion of the slab is understood to mean the proportion of the structural component austenite.
  • An ⁇ -portion of the slab is understood to mean the proportion of the structural component ferrite. The occurrence of a microstructure component depends in particular on the steel composition and the temperature. During the structural transformation, which takes place depending on the temperature, there is a change in density that can lead to cracks.
  • steel At comparatively low temperatures of less than or equal to temperature A 1 , steel has a high alpha content and is ferritic, in particular for steel with a maximum carbon content of 0.02% by weight. At higher temperatures greater than or equal to temperature A 3 , the steel has a high ⁇ content and is austenitic, in particular for steel with a maximum carbon content of 0.02% by weight.
  • Melt production and hot forming, in particular hot rolling mill are often arranged at different locations, so that slabs have to be transported at ambient temperature from melt production to hot forming, in particular to the hot rolling mill. Even in an integrated steel works, in which melt production and hot forming, in particular a hot rolling mill, are arranged at the same location, it is customary to allow slabs to cool down to ambient temperature.
  • a visual inspection of the slab for any surface defects can only be carried out by a suitably qualified employee after it has cooled down.
  • Another reason is the organizational structure integrated steel mills, so that it may be necessary to allow a slab to cool down between the casting of the slab and the hot rolling to hot strip due to temporal or spatial constraints.
  • the slabs before hot forming, the slabs must be completely reheated from ambient temperature to a temperature greater than or equal to the nitrite precipitation dissolution temperature of the underlying steel, which is between 950 °C and 1,280 °C depending on the alloy composition .
  • energy-saving hot charging methods and/or direct charging methods are also known in integrated steelworks, in which the slabs do not cool completely between casting and reheating in the furnace.
  • energy can be saved and CO 2 emissions reduced, with the slabs having a lower temperature in the hot charging process than in the direct charging method, so that more energy and CO 2 emissions can be saved in the direct charging method.
  • characteristic surface defects can occur if the cast slabs are placed in the furnace upstream of the hot rolling mill at surface temperatures in the so-called low-toughness range, which is between 700 °C and 950 °C depending on the steel composition.
  • a surface temperature is preferably understood as meaning an average temperature in an area adjacent to the surface of the slab, in particular in an area with a thickness of less than or equal to 5 mm and preferably in an area of less than or equal to 10 mm.
  • the above temperature range for the low-toughness range is to be defined differently for each steel composition and can be read from the time-temperature transformation diagram (TTT) of the material and/or calculated using metallurgical simulation methods (structural models). Current commercially available simulation tools are available with ThermoCalc/DICTRA, MatCalc and others.
  • the observed lower toughness in this temperature range and the associated tendency of the steels to develop cracks along the austenite grain boundaries when reheated is related to the density change during the austenite-ferrite-austenite microstructural transformation.
  • the cooling steel reaches its applicable temperature for the dissolution of nitrite precipitates A 3 , which is dependent on the chemical composition, the structural transformation begins via nucleation at the former austenite grain boundaries. Due to its lower density, the ferrite portions expand, but are placed under stress by the stronger austenitic portion, whereupon creep begins. If this microstructural transformation is interrupted and the steel is reheated, the previously transformed volume fraction of ferrite shrinks, causing tensile stresses to act in the material.
  • a tolerable surface damage caused by austenite-ferrite-austenite microstructural transformation in the low toughness range is also determined by specifying the still tolerable proportion of transformed ferrite.
  • the causal relationship explained above requires knowledge of the conditions under which this tolerable ⁇ proportion (ferrite proportion) on a surface of the slab or the counter-event determined with which ⁇ proportion (austenite proportion) on a surface of the slab at the time of use in the oven is to be expected.
  • a transport device which preferably has a means for at least indirectly determining the ⁇ component on a surface of the slab.
  • a means for at least indirectly determining the ⁇ component on a surface of the slab can also be provided and is proposed here according to an alternative embodiment .
  • Everything described below can be transferred directly to a means for at least indirectly determining the ⁇ -portion, it preferably being the case, in particular for a steel with a carbon content of less than or equal to 0.02% by weight, that the sum of the ⁇ -portion and ⁇ fraction on a surface of the slab is equal to one.
  • the transport device is expediently connected to a data acquisition and/or evaluation unit, the data acquisition and/or evaluation unit being set up at least indirectly to determine the ⁇ component on a surface of the slab.
  • a "data processing and evaluation unit” means an electronic component that is set up to process and evaluate data.
  • a data processing and evaluation unit can have a processor which is set up for data processing.
  • a data processing and evaluation unit pursues the goal of an organized handling of data, whereby information can be obtained from data and data can be compared with one another and/or changed.
  • the data processing and evaluation unit is preferably set up to determine the ⁇ component on a surface of the slab, taking into account the chemical and/or physical interactions.
  • a computer-assisted means for determining the ⁇ component on a surface of the slab is proposed here, in particular using methods from the field of artificial intelligence, in particular using neural networks.
  • the data processing and evaluation unit can be set up to compare measured values, in particular simultaneous measured values and/or a time series of measured values, in particular a time series of measured values of a current operating period of the transport device, and/or operating point parameters of the transport device with comparison values. in particular to be compared with empirical values and/or with a heuristic decision model and/or with values determined using a mathematical model and/or with numerical simulation values, for which the ⁇ component on a surface of the slab is already known in each case, so that the ⁇ component on a surface of the slab can be determined by matching, in particular by interpolation between the comparison values.
  • a slab cools from the outside inwards and therefore has the lowest temperatures on the surface while it cools.
  • the conversion of the ⁇ -part into the ⁇ -part for a given alloy of the slab and under constant environmental conditions only depends on the local material temperature, the conversion starts at the surface of the slab. In that sense it is sufficient to determine the ⁇ -proportion on a surface of the slab in order to be able to use this value to draw conclusions about the surface defects to be expected in the hot strip designated to be produced from the slab.
  • the data used for comparison to determine the ⁇ proportion on a surface of the slab indicate a dependency on the material composition of the slab and/or on the width of the slab and/or on the thickness of the slab and/or an environmental condition of the transport device.
  • the data processing and evaluation unit is preferably set up for data exchange with the continuous casting machine, so that the current operating point parameters of the continuous casting machine can be used to determine the ⁇ component.
  • the data processing and evaluation unit compares the data available to it with the comparison data available to it and selects the closest comparison data set.
  • the ⁇ component contained in the comparative data set thus corresponds to the determined ⁇ component for a surface of the slab.
  • the data processing and evaluation unit can preferably interpolate between a number of comparison data sets.
  • the data processing and evaluation unit can expediently convert comparative data records into a heuristic model for the ⁇ component, so that the ⁇ component on a surface of the slab can be determined by inserting the existing data into the model created.
  • the data processing and evaluation unit is in data exchange with at least one sensor and uses a measured value of the sensor to determine the ⁇ component, in particular by comparison with existing comparison data which corresponds to a measured value of the at least one Assign a ⁇ component to the sensor. It goes without saying that the data processing and evaluation unit can also use the data from a number of sensors simultaneously for this function, in particular from two, three, four or more sensors.
  • the transport device has a measuring device which is set up to determine the ⁇ component on a surface of the slab.
  • a measuring device is based on measuring the temperature of a surface of the slab and/or on determining the core losses of the slab and/or the core losses on the surface of the slab and/or evaluating the hysteresis characteristics of the core losses and/or on a molecular spectrum - roscopic methods, in particular a vibration spectroscopic method, in particular an infrared spectroscopic method, and/or an ultrasonic test method and/or an X-ray diagnostic method. It is expressly pointed out that the above embodiments can also be combined with one another without departing from the aspect described.
  • the transport device advantageously allows minimization of the surface damage to be expected on the hot strip produced from the slab and/or a reduction in the energy requirement for heating the Slab to a temperature greater than or equal to the temperature of the dissolution of nitrite precipitates of the slab, which can also reduce CO 2 emissions. Both of these objectives can also be achieved synergistically in an overall optimum. If the transport device detects a ⁇ component that leads to no longer tolerable surface defects in the hot strip specifically produced from the slab, the transport device can be set up to automatically eject the corresponding slab.
  • the transport device can thus help to provide a steel strip which is intended for further processing into finished products with optically sophisticated surfaces, such as visible automobile components, packaging sheet metal, household appliances or non-grain-oriented electrical steel sheets.
  • the transport device is set up to transport the slab with a ⁇ proportion on the surface of the slab greater than or equal to 90% to the furnace, preferably with a ⁇ proportion on the surface of the slab greater than that or equal to 95% and more preferably with a ⁇ content at the surface of the slab greater than or equal to 99%.
  • the slab when it arrives at the furnace, has a ⁇ -portion on a surface of the slab of greater than or equal to 90%, preferably a ⁇ -portion on the surface of the slab of greater than or equal to 95% and particularly preferably a ⁇ content on the surface of the slab of greater than or equal to 99%.
  • the slab upon arrival at the furnace, has a rated ⁇ content on a surface of the slab greater than or equal to 92.5%, preferably a ⁇ content on the surface of the slab greater than or equal to 97% a ⁇ content at the surface of the slab greater than or equal to 98%.
  • the above values for the ⁇ proportion on a surface of the slab should not be understood as sharp limits, but rather that they should be able to be exceeded or fallen below on an engineering scale without the described aspect of the leave invention.
  • the values should provide an indication of the size of the ⁇ component proposed here on a surface of the slab.
  • the values proposed here for the ⁇ component on a surface of the slab upon arrival at the furnace are directly related to the surface defects to be expected on the hot strip specifically produced from the slab, since it is preferably provided that the slab is also brought directly into the furnace upon arrival at the furnace and thus reaches the lowest temperature designated after casting in front of the furnace.
  • the values for the ⁇ -share on a surface of the slab when it arrives at the furnace provide information about the tolerable surface damage of the hot strip.
  • the value for the ⁇ component on a surface of the slab arrives at the furnace at the designated Use of the hot strip can be adjusted, whereby the energy requirement and coupled to this also the CO 2 emissions can be further reduced for some applications.
  • an assessment of the ⁇ -share can be made along a designated transport route of the transport device, with a means for determining the ⁇ -share of this is determined at one point and a change in the ⁇ -share can be made using a model, so that at the current ⁇ -component can be determined at every point of the slab along the transport device.
  • the model is expediently based on an assessment of the change in the surface temperature of the slab along the transport route of the transport device. Furthermore, the model can be used expediently by a data processing and evaluation unit of the transport device.
  • the transport device is preferably set up to transport the slab to the furnace at a speed which is intended for the slab to arrive at the furnace with the specified value for the ⁇ component.
  • the transport device is therefore particularly preferably set up to save energy and/or to reduce CO 2 emissions, since the slab can be used in the furnace with as large a proportion of the first heat as possible.
  • the transport device is optionally set up to transport the slab to the furnace with a ⁇ component on the surface of the slab of less than or equal to 99.8%, preferably with a ⁇ component on the surface of the slab of less than or equal to 99.5% and particularly preferably with a ⁇ proportion on the surface of the slab of less than or equal to 99.2%.
  • the means for determining the ⁇ component on a surface of the slab expediently has a measuring device, in particular a temperature measuring device.
  • the temperature measuring device is set up to record a surface temperature of the slab, which is to be understood as the average temperature in an area adjacent to the surface of the slab, in particular in an area with a thickness of less than or equal to 5 mm and preferably in an area of less than or equal to 10 mm.
  • a transport device is proposed here that has a measuring device that is set up to determine the ⁇ component on a surface of the slab, in particular a temperature measuring device.
  • the transport device can have a data processing and evaluation unit which, in combination with the measuring device, is set up to determine the ⁇ component on a surface of the slab by comparing the measured value with comparative data.
  • the measuring device in particular the temperature measuring device, is preferably arranged adjacent to the separating device.
  • Neighboring in connection with this description means that an effective range of the measuring device is closer to the object, here the separating device, than at the end of the transport device facing away from the object.
  • the effective range of the measuring device is preferably arranged at a distance of less than or equal to 1 m from the separating device. Due to the early determination of the ⁇ proportion on a surface of the slab in relation to the length of the transport device, the transport of the slab can be planned as early as possible with regard to its transport speed, so that any goals can be met when the furnace is reached.
  • the measuring device in particular the temperature measuring device, is optionally arranged adjacent to the furnace.
  • a measuring device arranged adjacent to the furnace expediently allows cascaded control of the transport device, in particular with regard to the speed and/or torque of a roller of the transport device.
  • the measuring device is arranged on the route of the transport device between the separating device and the furnace.
  • the ⁇ component can be determined at any other point along the route of the transport device, preferably based on a measured value determined at an arbitrarily selected point.
  • the electrically driven roller table has a speed control and/or a torque control.
  • the transport device proposed here is set up for speed control and/or torque control.
  • the transport device preferably has a first covering device, the first covering device being arranged adjacent to the separating device.
  • a "cover device” is a device that is set up so that a slab does not lose its thermal energy or retains it as best as possible, so that it does not cool down in relation to its average temperature or compared to the stand cools down less severely without a cover.
  • a covering device is preferably set up so that the average temperature of the slab, based on the volume of the slab, is not increased.
  • a covering device optionally has a measuring device for determining the ⁇ component on a surface of the slab, as a result of which the operation of the covering device can also be controlled and/or regulated.
  • a cover device is expediently a purely passive hood for the transport device, in particular an insulated one Hood, which is still preferably designed open on its underside.
  • a covering device is an active covering device, optionally with heated side walls, in particular with electrically and/or gas-fired side walls. In a particularly preferred manner, a covering device can also be actively cooled.
  • a transport device expediently has a first type of covering device adjacent to the cutting device, which is set up so that the cast strand can maintain a homogeneous temperature as far as possible in relation to its longitudinal extension until the slab is cut off.
  • the first type of covering device can counteract any temperature inhomogeneities on a surface of the slab that may arise from the comparatively low casting speed.
  • a transport device has a second type of cover device, which is set up for cooling the slab. In this way, the ⁇ component on a surface of the slab can be reduced to such an extent that the slab can be introduced into the furnace using a hot charging process, as a result of which surface damage can be largely decoupled from the austenite-ferrite-austenite structural transformation.
  • a second type of covering device is preferably arranged downstream of a first type of covering device.
  • the transport device has a third type of cover device adjacent to the furnace, which is designed to ensure that a slab that has to wait for use in the furnace does not cool down any further, so that the ⁇ component on a surface of the slab in front of the oven does not fall further.
  • This aspect is particularly advantageous in combination with a direct deployment process. It goes without saying that any type of covering device can be combined with any type of covering device without departing from the described aspect.
  • the transport device has a de-railing device. The following is explained conceptually in this regard: A “derailing device” is set up to derail a slab on the way between the cutting device and the furnace so that it does not reach the furnace.
  • a re-railing device is preferably set up to re-rail a slab as a function of its ⁇ component on a surface, in particular if excessive surface defects are to be expected in a hot strip formed specifically from the slab.
  • the object is achieved by a method for operating a transport device according to the first aspect of the invention, the transport device transporting a slab after the slab has been separated from a cast strand with a ⁇ component on a surface of the slab of greater or transported to a furnace equal to 90%, preferably with a ⁇ proportion on the surface of the slab of greater than or equal to 95% and particularly preferably with a ⁇ proportion on the surface of the slab of greater than or equal to 99%, in particular a method for producing hot strip designed from the slab with reduced surface defects and/or for energy-efficient production of hot strip designed from the slab.
  • the slab when it arrives at the furnace, has a ⁇ -portion on a surface of the slab of greater than or equal to 90%, preferably a ⁇ -portion on the surface of the slab of greater than or equal to 95% and particularly preferably a ⁇ content on the surface of the slab of greater than or equal to 99%. It goes without saying that the above-described advantages of the transport device according to the first aspect of the invention extend directly to the method proposed here for operating the transport device according to the first aspect of the invention.
  • the ⁇ component on the surface of the slab is preferably determined using a measuring device.
  • a measuring device is based on a measurement of the temperature of a surface of the slab and/or on a determination of the hysteresis losses of the slab and/or on a molecular spectroscopic method, in particular on a vibration spectroscopic method, in particular on an infrared spectroscopic method, and/or on an ultrasonic testing method and/or on an X-ray diagnostic method.
  • the transport device expediently accelerates the slab after it has been separated from the cast strand; the slab is preferably accelerated in such a way that its speed increases on the section from the separating device to the furnace.
  • the cast strand has a casting speed of less than or equal to 6 m/min.
  • the transport device expediently has an electrically driven roller table which can be used to accelerate the slab on its way to the furnace.
  • the electrically driven roller table is advantageously regulated, with the ⁇ component on the surface of the slab evaluated upon arrival at the furnace being able to be used as the controlled variable. This can preferably be determined with a measuring device explained above.
  • the speed of a roller and/or the torque of a roller can be used as the manipulated variable.
  • the proposed electrically driven roller table having a control having the ⁇ component on the surface of the slab evaluated upon arrival at the furnace as a controlled variable, it can be advantageously achieved that a slab is controlled by the control, even with changing boundary conditions a ⁇ proportion on a surface of the slab greater than or equal to 90% reaches the furnace, preferably with a ⁇ proportion on the surface of the slab greater than or equal to 95% and particularly preferably with a ⁇ proportion on the surface of the slab of greater than or equal to 99%.
  • the hot strip rolled out of it can preferably be used for further processing into finished products with optically sophisticated surfaces, such as visible automotive components, packaging sheet metal, household appliances or non-grain-oriented electrical steel sheets.
  • the slab has an average temperature of greater than or equal to 700° C., preferably an average temperature of greater than or equal to 720° C., between the time it is separated from the cast strand and when it reaches the furnace an average temperature greater than or equal to 730°C, and more preferably an average temperature greater than or equal to 740°C, the energy requirement for heating the slabs to the preferred temperature for hot rolling can be reduced, thereby also reducing CO 2 emissions can be reduced.
  • the object is achieved by using a transport device according to the first aspect of the invention for transporting a slab after the slab has been separated from a cast strand to a furnace with a ⁇ proportion on a surface of the slab of greater than or equal to 90% , preferably with a ⁇ proportion on the surface of the slab of greater than or equal to 95% and particularly preferably with a ⁇ proportion on the surface of the slab of greater than or equal to 99%, in particular use for producing from the slab designed hot strip with reduced surface defects and/or for energy-efficient production of hot strip designed from the slab.
  • the slab when it arrives at the furnace, has a ⁇ -portion on a surface of the slab of greater than or equal to 90%, preferably a ⁇ -portion on the surface of the slab of greater than or equal to 95% and particularly preferably a ⁇ content on the surface of the slab of greater than or equal to 99%.
  • the object is achieved by a method for producing hot strip designed from a slab with reduced surface defects and/or for energy-efficient production of hot strip designed from the slab, comprising the steps: Casting a steel strand having a specific steel - alloy; - Separating a slab from the steel strand with a separating device; - Determining a ⁇ -share on a surface of the slab; and - regulation of a transport speed of the slab to a furnace as a function of the determined ⁇ component on a surface of the slab.
  • the above method can advantageously be used to produce hot strip with reduced surface defects and/or Energy and thus also CO 2 emissions can be saved in the production of hot strip.
  • the slab preferably has a ⁇ proportion on a surface of the slab of greater than or equal to 90%, preferably a ⁇ proportion on the surface of the slab of greater than or equal to 95% and particularly preferably a ⁇ proportion on the surface of the slab greater than or equal to 99%. Furthermore, the slab preferably has a ⁇ proportion on the surface of the slab of less than or equal to 99.8%, preferably a ⁇ proportion on the surface of the slab of less than or equal to 99.5% and particularly preferably a ⁇ Proportion of the surface of the slab less than or equal to 99.2%. It is expressly pointed out that the subject of the fourth aspect can be advantageously combined with the subjects of the above aspects of the invention, both individually or cumulatively in any combination.
  • FIG. 1 a schematic representation of a transport device.
  • FIG. 1 a schematic representation of a transport device.
  • the transport device 100 is set up to transport the slab 150 with a ⁇ component on the surface of the slab 150 of greater than or equal to 90% to the furnace 120, preferably with a ⁇ component on the surface of the slab 150 of greater or equal to 95% and particularly preferably with a ⁇ proportion at the surface of the slab 150 of greater than or equal to 99%. Furthermore, the transport device 100 is set up to transport the slab 150 with a ⁇ component on the surface of the slab 150 of less than or equal to 99.8% to the furnace 120, preferably with a ⁇ component on the surface of the Slab 150 of less than or equal to 99.5% and particularly preferably with a ⁇ proportion on the surface of the slab 150 of less than or equal to 99.2%. For this purpose, the transport device 100 has a measuring device 140 which is arranged adjacent to the separating device 110 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne un dispositif de transport de brames entre un dispositif de séparation permettant de séparer une brame d'une coulée continue et un four, le dispositif de transport comportant un train de rouleaux à entraînement électrique, la brame présentant une fraction α et/ou une fraction γ, le dispositif de transport comportant un moyen de détermination de la fraction γ sur une surface de la brame.
EP22762109.1A 2021-08-18 2022-08-17 Dispositif de transport, procédé de fonctionnement d'un dispositif de transport et utilisation d'un dispositif de transport Pending EP4337402A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021121473.4A DE102021121473A1 (de) 2021-08-18 2021-08-18 Transportvorrichtung, Verfahren zum Betrieb einer Transportvorrichtung und Verwendung einer Transportvorrichtung
PCT/EP2022/072942 WO2023021079A1 (fr) 2021-08-18 2022-08-17 Dispositif de transport, procédé de fonctionnement d'un dispositif de transport et utilisation d'un dispositif de transport

Publications (1)

Publication Number Publication Date
EP4337402A1 true EP4337402A1 (fr) 2024-03-20

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EP22762109.1A Pending EP4337402A1 (fr) 2021-08-18 2022-08-17 Dispositif de transport, procédé de fonctionnement d'un dispositif de transport et utilisation d'un dispositif de transport

Country Status (3)

Country Link
EP (1) EP4337402A1 (fr)
DE (1) DE102021121473A1 (fr)
WO (1) WO2023021079A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6199632A (ja) * 1984-10-19 1986-05-17 Kawasaki Steel Corp 熱延鋼板の冷却制御方法
DE10256750A1 (de) 2002-12-05 2004-06-17 Sms Demag Ag Verfahren zur Prozesssteuerung oder Prozessregelung einer Anlage zur Umformung, Kühlung und/oder Wärmebehandlung von Metall
AT514380B1 (de) * 2013-05-03 2015-04-15 Siemens Vai Metals Tech Gmbh Bestimmung des ferritischen Phasenanteils nach dem Erwärmen oder Abkühlen eines Stahlbands
DE102014222827A1 (de) 2014-11-07 2016-05-12 Sms Group Gmbh Verfahren zum Steuern und/oder Regeln einer metallurgischen Anlage
CN108723099A (zh) * 2018-06-06 2018-11-02 日照钢铁控股集团有限公司 一种基于无头带钢生产线的铁素体轧制方法及装置
JP2020138222A (ja) * 2019-02-28 2020-09-03 Ｊｆｅスチール株式会社 鋳片の再加熱システム及び再加熱方法
DE102020205077A1 (de) 2019-09-23 2021-03-25 Sms Group Gmbh Vorrichtung und Verfahren zur Herstellung und Weiterbehandlung von Brammen

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WO2023021079A1 (fr) 2023-02-23
DE102021121473A1 (de) 2023-02-23

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