EP4228835A1 - Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern - Google Patents
Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändernInfo
- Publication number
- EP4228835A1 EP4228835A1 EP21794326.5A EP21794326A EP4228835A1 EP 4228835 A1 EP4228835 A1 EP 4228835A1 EP 21794326 A EP21794326 A EP 21794326A EP 4228835 A1 EP4228835 A1 EP 4228835A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slabs
- temperature
- slab
- transport
- casting machine
- 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.)
- Granted
Links
Classifications
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- B22D11/124—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
- B22D11/128—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
- B22D11/16—Controlling or regulating processes or operations
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
Definitions
- the invention relates to a device and a method for producing rolled metal strips, preferably hot-rolled metal strips.
- the technical structure and the requirements for casting/rolling plants differ depending on whether they are used to produce so-called “thin slabs” in a thickness range of around 40 to 110 mm, “medium slabs” in a thickness range of around 110 to 200 mm or “thick slabs”. are designed with greater thicknesses.
- a plant for the continuous casting and further treatment of thin slabs can be found, for example, in EP 0 808 672 A1.
- the systems are typically designed for a production focus and are therefore not or only slightly flexible for alternative products.
- the casting thickness i.e. the alloy-specific production of a thin slab or medium slab, is related to an alloy-specific casting speed, with not all alloys being suitable for the production of a thin slab.
- the target thickness and the process control vary depending on the intended use of the product. For example, the temperature controls before the start of the rolling process, between different rolling processes and after finish rolling, essential process steps for adjusting material properties. In the case of coupled casting/rolling processes, the available assemblies determine the possible process steps.
- the rolling stock is not formed from the casting heat, but rather that it is completely or partially cooled in a slab store, which means that there is a technological separation between the casting and further processing, in particular rolling, of the slabs.
- One object of the invention is to provide an improved device and an improved method for producing rolled metal strips, preferably hot-rolled metal strips, in particular to increase the range of products that can be processed without technological separation between casting and rolling.
- the device according to the invention serves to produce rolled, in particular hot-rolled, metal strips.
- products made of a metal, in particular a metal alloy, preferably steel are cast and processed.
- the device is preferably designed for the production and further processing of medium slabs with a thickness in the range from 90 to 250 mm, preferably 110 to 200 mm.
- the device has a casting machine that is set up to produce slabs and to transport them in a transport line of the casting machine.
- the casting machine is preferably implemented as a vertical bending system, also referred to as a "bow caster". However, it can also be implemented in another way, as long as it provides a cast strand that can subsequently be divided into slabs and further processed.
- the device also has a rolling mill which is set up to convert the slabs into corresponding metal strips by rolling while they are being transported along a transport line of the rolling mill.
- the two transport lines - transport line of the casting machine and transport line of the rolling plant - can coincide or differ, whereby in the latter case the slabs have to be transported crosswise on the way from the casting machine to the rolling plant.
- the rolling mill comprises, in the usual way, one or more roll stands, preferably each in a four-high design, each with two work rolls and two back-up rolls, and can be operated in reverse or in tandem.
- the rolling mill can include a roughing train and/or a finishing train or can be designed as such.
- the rolling mill is particularly preferably a hot rolling mill in which the slabs are formed at least partially from the casting heat, i.e. in this case the slabs do not cool down completely after casting on the way to the rolling mill.
- the device also has a combined transport and temperature influencing device (here also abbreviated as "KTT”), which is arranged between the casting machine and the rolling mill and set up to transport the slabs to or along the transport line of the rolling mill, to the rolling mill and adjusting the temperature of the slabs to a (suitable) rolling temperature.
- KTT transport and temperature influencing device
- the KTT is primarily used for the logistical delivery of the slabs to the rolling mill at the required temperature, which generally depends on process parameters such as the alloy.
- temperature not only includes absolute temperatures, such as the surface and core temperature, but also temperature distribution(s).
- the KTT as defined above, it contains the information, for example, that a slab produced by the casting machine is transported through the KTT and then through the rolling mill for forming into the desired metal strip.
- the device also has a surface device which is arranged between the casting machine and the KTT and is set up to machine and/or treat and/or inspect at least one of the surfaces of the slabs.
- the surface device can include a material-removing surface treatment, which is used, for example, to produce products with special surface requirements. Such special demands on the product surfaces are made, for example, for use as an automobile outer skin, electrical steel or for optical applications.
- the surface device can be set up to correct any surface defects resulting from the casting process, so that they are removed before further process steps such as rolling take place. This means that in this case it is a matter of surface treatment that goes beyond pure scale removal.
- the surface device can include an inspection device that is set up to detect surface properties of the slabs by means of contact or without contact.
- the device also has a temperature influencing device, which is arranged and set up between the casting machine and the KTT to modify the temperature of the slabs.
- the temperature influencing device is used in particular in the production of crack-sensitive products, such as micro-alloyed steels. If such alloys were fed into the KTT immediately after the casting process, microalloys could be separated out in the layers near the edges, which could lead to cracking or other quality defects in subsequent steps.
- the slabs do not have to go through each of the stations mentioned between the casting machine and the KTT. Rather, the stations can be integrated into the manufacturing process or removed from it depending on the product or application. Thus, slabs may pass through either the surface facility or the temperature affecting facility, or neither. In this case, the two stations do not have to be arranged in series in the same line, but they can be installed in parallel with a route decision made for the slabs accordingly, or they can be retractable into the line as needed. A parallel or in-line arrangement can alternatively be provided as required.
- the above-described device for the production of metal strips, in particular hot-rolled metal strips, can be used in a highly flexible manner with regard to the product range and at the same time makes do with a minimum use of energy.
- the device thus eliminates conventional limitations of the product range without interrupting the manufacturing process.
- the device is able to process both micro-alloyed steels and very soft material grades or material grades intended for special surface qualities in a fully fledged, uninterrupted manner and without technological limitations. Depending on the system layout, very compact arrangements and/or production modes can be implemented.
- the temperature influencing device comprises a combined heating and cooling device with a heating device and a cooling device, so that the slabs are selectively heated or heated by the temperature influencing device can be cooled.
- the heating device preferably comprises one or more inductive heating devices.
- the cooling device can be designed for rapid cooling of the slabs by applying a coolant, preferably cooling water.
- the heater and cooler may be installed in series or in parallel, preferably forming a common assembly.
- a temperature influencing device constructed in this way makes it possible to bring the surface temperature of the slabs to be treated quickly into a desired temperature window or out of a disadvantageous temperature window in a compact and flexible manner without intermediate storage and complete cooling in a slab store being necessary.
- the core heat can be retained at least partially and later used for rolling.
- the surface device is preferably set up to process at least one surface of the slab(s) by grinding and/or milling and/or scarfing.
- the surface machining takes place on at least one surface of the slab to be machined, with both the top and bottom of the slab and the longitudinal edges preferably being machined.
- the material removal per surface is, for example, in the range from 0 to 10 mm, preferably in the range from 1 to 3 mm.
- the surface treatment preferably takes place at a slab surface temperature of more than 600°C, particularly preferably more than 900°C.
- the KTT can exist in a variety of possible configurations. It preferably comprises: one or more roller tables; and/or one or more thermal insulation devices; and/or one or more inductive heating elements; and/or one or more ovens; and/or one or more slab discharge devices for discharging slabs from the transport line of the casting machine and/or transport line of the rolling mill; and/or one or more slab feeding devices for feeding slabs into the transport line of the casting machine and/or transport line of the rolling mill.
- the structure of the KTT is preferably variable with a view to the type of temperature influence and the logistics.
- the KTT includes a roller hearth furnace, which both equalizes the temperature and transports the slab.
- the KTT comprises a roller table as a transport element, preferably with a thermal insulation device, in combination with at least one, preferably several, inductive heating elements.
- the KTT can have several walking beam furnaces arranged one behind the other, as a result of which a very compact structure can be achieved.
- the KTT can act as an interface between the technologically separate casting machine and rolling plant.
- technical means rollers, slab shuttles, walking beams, etc.
- This flexible arrangement also makes it possible to feed slabs from other sources into the corresponding transport line or to divert them from the transport line.
- the transport line of the caster and the transport line of the rolling mill are identical.
- the transport line of the casting machine and the transport line of the rolling plant differ, and they preferably run parallel, as a result of which the plant can be implemented in a particularly compact manner.
- the surface device, temperature influencing device and at least parts, up to the entire KTT can be positioned one behind the other in one and the same transport line.
- a number of routes are preferably provided, which implement different process lines for the slabs, at least in sections.
- the surface facility can be arranged in a first route and the temperature influencing device in a second route and arranged so that the slabs pass through either the surface facility or the temperature influencing device, but not both.
- It can a third route can also be provided here, which acts as a bypass in that the slabs bypass both the surface device and the temperature influencing device, ie leave them out, and can be introduced into the combined transport and temperature influencing device immediately after casting.
- the routing decision can be made by batch, product or slab individually, depending on process parameters such as the alloy or temperature of the slabs or depending on quality requirements that result, for example, from the intended application of the rolled products.
- the rolling mill is preferably a hot rolling mill which is set up to at least partially deform the slabs from the casting heat of the casting machine.
- the device as a whole is designed in such a way that the slabs do not cool down completely after casting on the way to the rolling mill.
- the slabs are not transferred to a slab store.
- the slab is largely continuously “in motion”.
- the production process is determined by the production cycles of the casting machine.
- the device can be implemented in a particularly compact and energy-saving manner, without the flexibility suffering as a result.
- the control device described below is preferably set up to feed the slabs cast by the casting machine to the rolling mill without intermediate storage in a slab store.
- Intermediate storage in a slab store is understood to mean any interruption in the process control of the slab(s) that leads to a substantially complete cooling of the slab(s), including the slab core, before rolling.
- Temperature reductions as part of the process control, such as in thermomechanical rolling, are not understood as intermediate storage.
- the device preferably has a control device which is set up to control the process control of the slabs as a function of measured and/or calculated process parameters, preferably comprising the alloy and / or temperature of the cast slabs to control.
- the control device is connected in terms of signals to the components of the device to be controlled and/or read out, thus in particular to the casting machine, the surface device, the temperature influencing device, the KTT and the rolling plant.
- the communication between the control device and the system components to be controlled and/or read can be wired or wireless, digital or analog.
- the control device can correspondingly receive and/or transmit signals (control signals, data, etc.), with signal transport in one direction as well as in both directions falling under the term “communication” in this context.
- the control device does not necessarily have to be realized by a central computing device or electronic regulation, but decentralized and/or multi-stage systems, regulation networks, cloud systems and the like are included.
- the controller can also be an integral part of a higher-level system controller or communicate with one.
- the control device preferably includes one or more process models or at least one interface to one or more process models.
- the control device can communicate with a process model of the casting machine and a process model of the rolling installation.
- the control device is preferably set up to map the process management and the process parameters from the casting machine to the rolling mill. Relevant data, such as the slab temperature or final rolling temperature, are communicated to the control device from the process model of the casting machine and the process model of the rolling mill. In this way, data can be obtained which determine the manufacturing steps and influence the corresponding settings of the stations.
- the control device is preferably set up to slabs (in particular an alloy susceptible to cracking) by means of the temperature influencing device to heat or cool in such a way that the slab surface temperature before entering the combined transport and temperature influencing device is outside a critical temperature range, defined by a lower threshold value of preferably 600°C and an upper threshold value of preferably 850°C.
- the temperature influencing device optionally heats or cools the slab passing through it, so that it is ensured that the slab surface temperature lies outside the critical temperature range. This preferably takes place as a function of a measured or otherwise determined slab surface temperature upstream of the temperature influencing device.
- control device determines, possibly in cooperation with a corresponding temperature sensor or calculation model, that the slab surface temperature at the inlet of the temperature influencing device is above the upper threshold value or below the lower threshold value, no temperature influencing by the temperature influencing device is necessary. If the slab surface temperature is within the critical temperature window, the slab is either heated or cooled by the temperature influencing device, depending on the direction in which the slab can be brought out of the temperature window. If both directions are possible, heating of the slab by the temperature influencing device is preferred.
- the above-mentioned object is also achieved by a method for producing rolled metal strips, preferably hot-rolled metal strips, the method being carried out using a device according to one of the embodiment variants presented above.
- the method includes: casting a slab using the casting machine; transfer of the slab to the KTT; Hot rolling of the slab in the rolling mill to form a metal strip, with the slab not cooling down completely after casting on the way to the rolling mill, and preferably the slab temperature in its core does not fall below 600°C.
- the slab is transported directly into the combined transport and temperature influencing device depending on one or more process parameters, or the temperature is influenced by the temperature influencing device and/or processing and/or treatment and/or inspection at least one surface of the slab by the surface facility.
- FIG. 1 shows a schematic representation of a device for producing metal strips, in particular hot-rolled metal strips
- FIG. 2 shows a schematic representation of a casting machine
- FIG. 3 shows a schematic representation of a device for producing hot-rolled metal strips according to a further exemplary embodiment
- FIGS. 4a to 4e show schematic representations of a combined transport and temperature influencing device according to different exemplary embodiments
- FIG. 5 shows a schematic representation of the configurations, communication and functioning of the control device 100 according to an exemplary embodiment.
- FIG. 1 shows schematically the basic structure of a device 1 for the production of metal strips, in particular hot-rolled metal strips.
- the device 1 includes a casting machine 10, which is preferably implemented as a vertical bending system, also referred to as a “bow caster”.
- the casting machine 10 can also be implemented in a different way, as long as it provides a cast strand that can subsequently be divided into slabs and further processed.
- a plurality of casting machines 10 can be provided for casting a plurality of strands in parallel, or the casting machine 10 can be set up for casting a plurality of parallel strands.
- FIG. 2 schematically shows an exemplary casting machine 10.
- the liquid metal to be cast is fed to a mold 11 of the casting machine 10, for example from a ladle.
- the mold 11 brings the molten metal into the desired slab shape, while it gradually solidifies from the outside inwards through the cooled mold walls.
- the mold 11 is preferably a mold made of copper plates (or plates of a copper alloy which can be coated), in the case of medium slabs with plane-parallel plates on the broad sides and narrow sides, which are suitable for a comparatively high casting thickness of, for example 140mm or more are customized.
- the copper plates can have a funnel-shaped contour and/or be curved in a transport direction corresponding to the casting radius of a strand guide 12 .
- the cast strand S which has not yet completely solidified, emerges downwards from the mold 11, is then initially guided further downwards in the transport direction along the strand guide 12 and then deflected into the horizontal in a bending region while it gradually cools.
- the direction of transport in the casting machine 10 does not generally denote a constant directional vector, but can depend on the strand or slab position along the device 100 . After being deflected to the horizontal, the cast strand S is conveyed along a transport line of the casting machine CLC.
- the strand guide 12 includes rollers 13, which transport the cast strand S and can be adjusted for thickness reduction according to LCR (“Liquid Core Reduction”) or DSR (“Dynamic Soft Reduction”) so that the transport gap in which the cast strand is transported along the transport direction transported, gradually narrows.
- the strand guide 12 can be constructed in segments, for example by two or more structurally similar curved segments that form a bending area of the strand guide 12 .
- the cast strand S is actively or passively cooled as part of secondary cooling, for example by spray water, as a result of which it gradually solidifies from the outside inwards.
- a shaping of the cast strand S caused by the casting machine 10, in particular the strand guide 12, is referred to as “primary shaping”; in contrast to “forming”, which describes shaping by a forming unit such as a rolling mill.
- rollers 13 are provided for guiding and transporting the cast strand S.
- One or more of the rollers 13 are drive rollers and drive the cast strand S in the direction of transport, other rollers 13 are used to guide and align the cast strand S.
- the rollers 13 form means for driving and bending the cast strand S. Downstream of the casting machine, further devices can be installed be arranged.
- the device 1 also has a separating device 14 which is arranged in the transport line CLC behind the straightening area of the casting machine 10 .
- the separating device 14 serves to cut or divide the cast strand S into slabs B. The cut is made along the slab thickness.
- the “slab thickness” refers to that dimension of the slab B which is perpendicular to the longitudinal extension and perpendicular to the width (perpendicular to the plane of the paper in FIG. 2) of the slab B.
- the separating device 14 is set up to the cast strand S during the promotion, d. H. to cut during the movement of the cast strand S along the transport line CLC.
- the separating device 14 is preferably a pair of scissors, in particular pendulum scissors.
- the shears are set up in such a way that the transport movement of the cast strand S is tracked during the cutting process and one or more cutting knives cut the strand in a movement vertical to the cast strand S.
- shears have the advantage that the cutting time is less than 5 minutes, preferably less than one minute, and no softening of the slab head/foot is required.
- the slabs B to be cast are preferably medium slabs, i. H. Slabs B with a thickness in the range of about 90 to 250 mm, preferably 110 to 200 mm.
- the casting speed is preferably in the range from 0.5 to 7 m/min, particularly preferably in the range from 1 to 4.8 m/min.
- a decoupler 15 can be provided upstream or downstream of the separating device 14, for example designed as a dummy leg rocker, which is set up in order to be able to decouple the cast strand S from the process line if required, for example when starting up the plant.
- the device 1 can have one or more descaling devices 16 which, depending on the configuration, is/are arranged in front of and/or behind the separating device 14 .
- One or more heating devices 17, preferably inductive, working with gas burners or electrically, can be installed at different positions in the process line. You can take over the task of the heating device 31 individually or in combination.
- One or more heating devices 17 are preferably located essentially immediately upstream of the separating device 14 or of the decoupler 15, if present, and/or downstream of the separating device 14. Heating devices 17 of this type can contribute to shortening the cooling distance on the one hand, and on the other they simplify it slab logistics.
- an inspection system 18 for checking the slab quality for example the surfaces of the slabs B, can be installed in close proximity, downstream of the casting machine 10 .
- the device 1 also includes a rolling mill 50, which is preferably a hot rolling mill.
- the rolling installation 50 has one or more roll stands, preferably each in a four-high design, each with two work rolls forming the roll gap and two back-up rolls, and can be operated reversibly or in tandem.
- the rolling mill 50 can be designed as a roughing train and/or a finishing train.
- the slabs B are transported through the rolling mill 50 along a transport line CLM, which can coincide with the transport line of the casting machine CLC (see FIGS. 3, 4a, 4b, 4c) or can differ from it (see FIGS. 4d and 4e). .
- the casting machine 10 there is a combination of assemblies between the casting machine 10 and the rolling plant 50, comprising, according to the exemplary embodiment in FIG.
- the nature and spatial arrangement of the assemblies can vary, as shown in the following exemplary embodiments.
- the combination of the assemblies 20, 30, 40 is selected so that the device 1 allows the processing of different products, in particular both surface-sensitive products and temperature-sensitive products, along individual process steps, with the products directly following the casting process, ie in particular without intermediate storage of the products in a slab store are fed to the rolling process.
- further assemblies can be arranged between the casting machine 10 and the rolling plant 50, for example further separating devices, emergency roller tables, additional heating/cooling elements, thermal insulation hoods, general transport roller tables and the like.
- Such assemblies/devices are preferably arranged between the casting machine 10 and the KTT 40.
- the surface device 20 and the temperature influencing device 30 are arranged in parallel and thus form alternative routes for the slabs B.
- a third route is also provided, which acts as a bypass in that the slabs B pass both the surface device 20 and the temperature influencing device 30 bypass, i.e. leave out, and can be introduced into the KTT 40 immediately after casting.
- FIG. 3 shows an alternative exemplary embodiment in which the surface device 20, the temperature influencing device 30 and the KTT 40 are arranged in one and the same transport line.
- An additional heating device 60 preferably in the form of an inductive heating element, is provided immediately after the outlet of the casting machine 10. Especially for slowly cast slabs B, this results in an additional flexibility advantage for the temperature control.
- the above-mentioned separating device 14 can be installed as an assembly of the casting machine 10 or separately in the process line.
- a further separating device 70 can be installed for emergencies/breakdowns in order to further split up and convey out a cast strand S exiting the casting machine.
- a control device 100 is provided, which communicates with the various assemblies 10, 20, 30, 40, 50, actuators, sensors and the like and is set up to control the process control as a function of process parameters, for example the alloy and the temperature of the cast product , to control.
- a method for producing hot-rolled metal strips directly after the casting process, i.e. without intermediate storage of the slabs B in a slab store, can comprise the following steps: a) production of a slab B with a specified alloy and dimensions by means of the casting machine 10; b) transferring the slab B to the KTT 40; c) hot rolling the slab B in the rolling mill 50 into a strip.
- the forming in the rolling mill 50 takes place at least partially from the casting heat, i.e. the slab B does not cool down completely after casting on the way to the rolling mill 50.
- the above wording “immediately after the casting process” thus means that there is no logistical outsourcing of the slab B to a slab store and the temperature of the slab in its core preferably does not fall below 600°C.
- the slab is largely continuously “in motion”.
- the production process is determined by the production cycles of the casting machine.
- a route decision can be made to route the slab(s) B through the surface facility 20 which To transport temperature influencing device 30 or bypassing the two immediately in the KTT 40.
- the route decision can be made manually or automatically, for product batches or individually for each slab, for example depending on at least one measured or calculated process parameter.
- the route decision implies different transport routes, at least in sections, while in the case of FIG. Alternatively or additionally, one or more of the assemblies 20, 30, 40 can be moved into or out of the process line as required.
- the surface facility 20 is a facility for processing and/or treating and/or inspecting one or more surfaces of the slabs B.
- the surface device 20 can include a material-removing surface treatment, which is used, for example, to treat products with special surface requirements. Such special demands on the product surfaces are made, for example, for use as an automobile outer skin, electrical steel or for optical applications.
- the surface device 20 can be set up to correct any surface defects resulting from the casting process, so that they are removed before further process steps such as rolling take place. This means that in this case it is a matter of surface treatment that goes beyond pure scale removal.
- the surface machining takes place on at least one surface of the slab B to be machined, with both the top and bottom of the slab B and the longitudinal edges preferably being machined.
- the material removal per surface is preferably in the range from 0 to 10 mm, particularly preferably 1 to 3 mm.
- the feed rate of the slab B can be in the range from 5 to 50 m/min.
- the surface treatment takes place preferably at a Slab surface temperature of more than 600 ° C, more preferably more than 900 ° C instead, so that no storage and cooling of the slabs B in a slab store is required for the surface treatment.
- the surface device 20 is preferably a scarfing device that is set up to machine the relevant surfaces of the slabs B by removing material.
- the surface device 20 can comprise a grinding device or milling device for machining one or more slab surfaces.
- the surface device 20 can comprise an inspection device that is set up to detect surface properties of the slabs B by means of contact or without contact. The surface information determined in this way can be used by the control device 100 for further process management.
- the surface device 20 is implemented in terms of process technology without intermediate storage. With regard to the layout of the device 1, this can mean that the surface device 20 is arranged in the transport line of the casting machine CLC. Optionally, the surface facility 20 may be arranged to be removable from the process line when not in use. Alternatively, the surface device 20 can be arranged outside, but in the vicinity of the process line, so that the slab B is discharged from the process line for processing and then discharged back again. In this case, the slabs B are preferably returned at a slab surface temperature of more than 600.degree.
- the temperature influencing device 30 preferably comprises a combined heating and cooling device with a heating device 31 and a cooling device 32.
- the temperature influencing device 30 is used in particular in the production of crack-sensitive products, such as micro-alloyed steels. If such alloys are cast immediately after the casting process, ie in a entered the KTT 40 in a certain temperature range, micro-alloys can be separated out in the layers near the edges, which can lead to cracking or other quality defects in subsequent steps.
- This critical temperature range relates to the surface temperature of the slab B and is referred to as Tcritical with a lower threshold value T u and an upper threshold value T o .
- T u is around 600°C and T o around 850°C.
- the temperature influencing device 30 optionally heats or cools the slabs B passing through it, so that it is ensured that the slab surface temperature lies outside the critical temperature range Tcritical.
- the control device 100 controls either the heating device 31 or the cooling device 32 accordingly in such a way that the surface temperature of the slab B does not fall within the stated temperature window. This preferably takes place as a function of a measured or otherwise determined slab surface temperature. If the control device 100 determines, possibly in cooperation with a corresponding sensor, that the slab surface temperature at the inlet of the temperature influencing device 30 is above T o or below T u , no temperature influencing by the temperature influencing device 30 is necessary.
- the slab B is either heated or cooled by the temperature influencing device 30, depending on the direction in which the slab B can be brought out of the temperature window Tcritical. If both directions are possible, heating of the slab B by the temperature influencing device 30 is preferred.
- the heating device 31 is preferably an inductive heating device, as a result of which the heating power can be set quickly and individually with a compact design.
- a gas-powered or electric-powered continuous furnace can also be used.
- the cooling device 32 is preferably set up to realize rapid cooling of the slabs B by applying a coolant, preferably cooling water.
- the amount of cooling water applied is preferably more than 500 m 3 /h/m 2 , particularly preferably more than 650 m 3 /h/m 2 , applied over a cooling section length of preferably 3 to 10 m, particularly preferably 4 to 6 m, so that at different slab speeds, a near-surface temperature reduction to a temperature below T u takes place.
- “near the surface” means a penetration depth of up to 15 mm from the slab surface.
- the exposure time of the cooling water is preferably less than 3 minutes.
- laminar cooling or other cooling equipment can be installed.
- An advantage of the near-surface cooling is that the core temperature of the slab B is not or only slightly affected, whereas the surface temperature drops to a temperature at which cracking due to micro-precipitations is avoided.
- the core temperature which is not lowered or only slightly lowered, facilitates the subsequent reheating of the slab B to the desired hot rolling temperature, with the required heating power and heating time being able to be minimized in comparison to heating a completely cooled slab B from a slab store. This leads to significant energy savings.
- the heater 31 of the temperature influencing device 30 is also advantageous for the production of Si steel because the overall temperature can be maintained at a desired level and the temperature setting before hot rolling to be set to secure a finish rolling temperature is less variable.
- the aluminum nitrides precipitated on the surface when the slab B solidifies are redissolved and held there so that they can be selectively precipitated again during hot rolling.
- the expenditure of time that is necessary for dissolving the aluminum nitrides can thus be distributed over different units, namely the temperature influencing device 30 and the KTT 40 described below, so that a more flexible process control, a shorter plant layout and shorter residence times in the KTT 40 can be implemented.
- the combined transport and temperature influencing device 40 is used for the logistical supply of the slabs B to the rolling mill 50 with the alloy-dependent, process-related necessary or desired temperature and temperature distribution.
- the temperature control of the slabs B and the logistical transport take place at the same time.
- the slab B is conveyed directly from the casting machine 10 into the KTT 40 or intermediate process steps such as surface treatment and/or temperature influence have taken place, there is an individual inlet temperature in the KTT 40.
- the heating output and/or residence time of the Slab B in the KTT 40 preferably adjustable in order to maintain a temperature in the outlet of the KTT 40, which ensures the appropriate rolling temperature in the inlet of the rolling mill 50.
- the KTT 40 is controlled by the control device 100, which takes into account any process steps that may have been carried out beforehand.
- the structure of the KTT 40 is preferably variable with regard to the type of temperature influence and the logistics. This is explained below using exemplary embodiments.
- the KTT 40 comprises a roller hearth furnace, which carries out both temperature equalization and transport of the slab B.
- the use of a roller hearth furnace can cause surface defects and/or running marks in the product due to accumulated scale on the furnace rollers, which is why it can make sense to consider alternative designs for the KTT 40, especially with regard to products that are sensitive to cracks and/or products with a sensitive surface.
- FIG. 4a shows such an alternative variant, in which the KTT 40 comprises a roller table 41 as a transport element, preferably with a thermal insulation device, in combination with at least one, preferably several, inductive heating elements 45.
- the heating elements 45 can be integrated into the entire roller table section. The arrangement of a large number of inductive heating elements 45 makes it particularly easy to set the temperature individually.
- the mechanically simple variant according to FIG. 4a enables a compact structure which is particularly suitable for a plant configuration in which the transport line of the casting machine CLC and the transport line of the rolling plant CLM are the same. If the transport lines CLC, CLM of the casting machine 10 and the rolling plant 50 are identical, individual slabs B or an endless rolling stock can be conveyed into the rolling plant 50 .
- FIG. 4b shows a further variant in which the KTT 40 comprises one or more walking beam furnaces 42 arranged one behind the other.
- Such a sequence of walking beam furnaces 42 enables a very compact construction, preferably for plant configurations in which the transport lines CLC, CLM of the casting machine 10 and the rolling plant 50 are the same. If the transport lines CLC, CLM are identical, individual slabs B or an endless rolling stock can be conveyed into the rolling mill 50.
- FIG. 4c shows a further variant in which, based on the design of FIG. 4a, one or more slab discharge device(s) and/or slab input device(s) are installed transversely to the transport line CLC, CLM.
- This increases plant flexibility in that not only can slabs B be fed to the rolling plant 50 directly after the casting process, but also slabs B can be discharged to another station, for example a slab store, or from another station, for example a slab store, to the transport line CLC, CLM can be entered.
- an emergency discharge can be carried out in this way, for example in the event of an accident in the casting machine 10 or the rolling plant 50 .
- the slab transport across the The conveying direction can take place, for example, via a slab ferry 43 and/or a corresponding roller table element 44 .
- a slab ferry 43 and/or a corresponding roller table element 44 Such a possibility of introducing and/or removing slabs B transversely to the transport line CLC, CLM is not only possible based on the basic structure of FIG. 4a, but can generally be implemented for any design of the KTT 40, for example based on the design of FIG. 4b.
- the transport lines CLC, CLM of the casting machine 10 and the rolling plant 50 are not identical, but are spaced apart and arranged in parallel, as shown in the exemplary embodiments of FIGS. 4d and 4e. This enables a particularly compact design.
- the slabs B are transported in the respective transport lines CLC, CLM via a plurality of roller tables 41, possibly with a thermal insulation device.
- Transport across the transport lines CLC and CLM can be carried out via one or more walking beam furnaces 46 .
- the walking beam furnaces 46 may be electric and/or gas fired.
- a walking beam furnace 46 can simultaneously transport and influence the temperature.
- the furnaces can vary in the working ranges of their temperature levels and/or cycle times. The residence time of the slabs B in the walking beam furnaces 46 can thus be controlled individually.
- the slabs B are transported and heated in the transport lines CLC and/or CLM via roller tables 41 with integrated heating elements 45, which are preferably inductive heating elements.
- the slabs B are transported across the transport lines CLC, CLM using one or more slab ferries 43.
- the possible combinations of transport elements and heating elements in the KTT can be further combined as desired.
- an emergency discharge can be carried out in this way, for example in the event of an accident in the casting machine 10 or the rolling plant 50 .
- the slabs can be transported transversely to the conveying direction, for example via a slab ferry 43 and/or a corresponding roller table element 44 .
- control device 100 An exemplary configuration of the control device 100 is described below with reference to FIG.
- the control device 100 is signal-connected to the components of the device 1 to be controlled and/or read out, thus in particular to the casting machine 10, the surface device 20, the temperature influencing device 30, the KTT 40 and the rolling mill 50.
- the communication between the control device 100 and the The system components to be controlled and/or read can be wired or wireless, digital or analog.
- the control device 100 can correspondingly receive and/or transmit signals (control signals, data, etc.), with signal transport in one direction as well as in both directions falling under the term “communication” in this context.
- the control device 100 does not necessarily have to be realized by a central computing device or electronic regulation, but decentralized and/or multi-level systems, regulation networks, cloud systems and the like are included.
- the controller can also be an integral part of a higher-level system controller or communicate with one.
- the control device 100 preferably includes one or more process models or at least one interface to one or more process models. For communication with the devices to be controlled or read out, it is irrelevant whether the necessary calculations take place in a process model connected to the control device 100 and the calculations are communicated to the control device 100 or whether the control device 100 includes the process model itself.
- the control device 100 communicates with a process model of the casting machine PMC and a process model of the rolling installation PMM.
- the process models PMC, PMM can include overlapping partial models, which preferably cover the area between the casting machine 10 and the rolling plant 50 that is relevant for the control device 100 . Alternatively, only one of the areas mentioned can cover the relevant area, or an independent sub-model can be implemented.
- the control device 100 can communicate with system controls of lower levels, i.e. controls assigned to the corresponding devices.
- the control device 100 is set up to map the process control and the process parameters from the casting machine 10 to the rolling plant 50 . Relevant data, such as the slab temperature or the final rolling temperature, are communicated to the control device 100 from the process model of the casting machine PMC and the process model of the rolling mill PMM.
- a data exchange with a production planning system or process control planning can facilitate the work of the control device 100 and automate the process control, the necessary calculations and the forwarding of the control signals.
- control device 100 obtains a data record of a product to be manufactured from a process control plan, for example a so-called "Level 3 system", and thus receives information about the planned production steps and the final specifications of the finished product. Data are now available in the control device 100, which define the production steps and influence the corresponding settings of the devices 10, 20, 30, 40, 50.
- a process control plan for example a so-called "Level 3 system”
- the settings of the casting machine 10 and the rolling plant 50 can be based on extensive technological-physical model calculations, so that information about the slab alloy, slab geometry, slab temperature, slab speed and/or slab surface is available at the output of the casting machine 10 .
- the information can be determined by calculation and/or measurement (e.g. temperature measurement, surface inspection, etc.).
- the corresponding values/information are made available in control device 100 .
- the control device 100 now determines, taking into account the information provided by the casting machine 10, the parameters required for further process control, in particular the slab speed downstream of the casting machine 10, and sets these on the relevant components.
- the controller 100 determines whether the slab B is to be subjected to processing and/or inspection in the surface facility 20 and initiates this process if necessary.
- the control device 100 calculates whether the temperature influencing the temperature in the temperature influencing device 30 is necessary for the present alloy. If such a temperature influencing is necessary, the control device 100 calculates the setting of a corresponding cooling capacity or heating capacity of the temperature influencing device 30 from the required heat flow.
- the control device 100 calculates the slab temperature to be maintained at the end of the KTT 40 and associated parameters such as Slab speed, minimum residence time in the KTT 40, if necessary the heating power to be set based on the geometric dimensions, in particular the thickness and length of the slab B, and the like. If required, it may be necessary to feed further data from intermediate steps into control device 100 as a basis for calculation, as illustrated by arrows in FIG.
- the device 1 presented here for the production of metal strips, in particular hot-rolled metal strips, can be used in a highly flexible manner with regard to the product range and at the same time makes do with a minimum use of energy.
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Abstract
Description
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP25168538.4A EP4578570A3 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020212914 | 2020-10-13 | ||
| DE102021211339.7A DE102021211339A1 (de) | 2020-10-13 | 2021-10-07 | Vorrichtung und Verfahren zur Herstellung von warmgewalzten Metallbändern |
| PCT/EP2021/078174 WO2022079027A1 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP25168538.4A Division EP4578570A3 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4228835A1 true EP4228835A1 (de) | 2023-08-23 |
| EP4228835B1 EP4228835B1 (de) | 2025-04-09 |
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ID=80818495
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
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| EP25168538.4A Pending EP4578570A3 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
| EP21794326.5A Active EP4228835B1 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP25168538.4A Pending EP4578570A3 (de) | 2020-10-13 | 2021-10-12 | Vorrichtung und verfahren zur herstellung von warmgewalzten metallbändern |
Country Status (7)
| Country | Link |
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| US (1) | US12515252B2 (de) |
| EP (2) | EP4578570A3 (de) |
| JP (1) | JP7640686B2 (de) |
| CN (1) | CN116390820B (de) |
| DE (1) | DE102021211339A1 (de) |
| FI (1) | FI4228835T3 (de) |
| WO (1) | WO2022079027A1 (de) |
Families Citing this family (1)
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|---|---|---|---|---|
| EP4724215A1 (de) * | 2023-06-09 | 2026-04-15 | SMS Group GmbH | Einrichtung und verfahren zum aufheizen einer bramme |
Family Cites Families (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131919A (en) * | 1976-04-28 | 1977-11-05 | Nippon Steel Corp | Production of a1-s# killed steel plate by direct fot rolling of continuous cast slab |
| JPH0381012A (ja) * | 1989-08-22 | 1991-04-05 | Kawasaki Steel Corp | 直接圧延工程における熱補償装置 |
| JP3152241B2 (ja) * | 1990-06-12 | 2001-04-03 | 株式会社日立製作所 | 熱間薄板製造設備及び製造方法 |
| JPH05208216A (ja) * | 1992-01-31 | 1993-08-20 | Nippon Steel Corp | 連続鋳造スラブの処理設備 |
| US5276952A (en) | 1992-05-12 | 1994-01-11 | Tippins Incorporated | Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line |
| US5467519A (en) | 1994-01-10 | 1995-11-21 | Tippins Incorporated | Intermediate thickness twin slab caster and inline hot strip and plate line |
| JP3190319B2 (ja) * | 1994-04-04 | 2001-07-23 | 新日本製鐵株式会社 | 双ロール式連続鋳造装置 |
| DE19621259A1 (de) | 1996-05-25 | 1997-11-27 | Schloemann Siemag Ag | Verfahren und Anlage zur Herstellung von Edelstahl- oder Kohlenstoffstahlblech aus durch Strangguß erzeugten Dünnbrammen |
| JP3401143B2 (ja) * | 1996-07-30 | 2003-04-28 | 新日本製鐵株式会社 | スラブ供給方法 |
| DE69909332T2 (de) | 1999-04-07 | 2004-05-27 | Giovanni Arvedi | Integriertes kontinuierliches stranggiess- und inline warmwalzverfahren sowie entsprechendes verfahren mit zwischenwickeln und abwickeln des vorstreifens |
| US20020104597A1 (en) * | 1999-07-09 | 2002-08-08 | Ipsco Enterprises Inc. | Method and apparatus for producing steel |
| DE19953252A1 (de) * | 1999-11-04 | 2001-05-10 | Sms Demag Ag | Verfahren zur Oberflächenbearbeitung eines kontinuierlich gegossenen Stahlproduktes und Einrichtung hierzu |
| DE10304318C5 (de) | 2003-02-04 | 2015-10-15 | Sms Group Gmbh | Verfahren zum Walzen von dünnen und/oder dicken Brammen aus Stahlwerkstoffen zu Warmband |
| ES2342168T3 (es) | 2004-10-28 | 2010-07-02 | Giovanni Arvedi | Procedimiento y linea de produccion para la fabricacion de flejes de acero ultradelgados, en caliente, con dos lineas de colada continua, para una unica linea de laminado continuo. |
| CN1840252A (zh) * | 2005-03-28 | 2006-10-04 | 鞍钢集团新钢铁有限责任公司 | 中厚板坯连铸连轧板卷的生产工艺 |
| JP5371421B2 (ja) * | 2005-04-07 | 2013-12-18 | アルベディ,ジョバンニ | 連続鋳造および圧延の間に連続性を分断することなく金属ストリップおよび金属シートを製造するプロセスおよびシステム |
| DE102008029581A1 (de) * | 2007-07-21 | 2009-01-22 | Sms Demag Ag | Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl |
| DE102008020412A1 (de) | 2007-08-24 | 2009-02-26 | Sms Demag Ag | Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen |
| DE102009036378A1 (de) * | 2009-08-06 | 2011-02-17 | Sms Siemag Ag | Verfahren und Vorrichtung zum Herstellen eines mikrolegierten Stahls, insbesondere eines Röhrenstahls |
| AT514079B1 (de) * | 2013-05-21 | 2014-10-15 | Siemens Vai Metals Tech Gmbh | Verfahren und Vorrichtung zum schnellen Ausfördern von Grobblechen aus einem Walzwerk |
| DE102013214940A1 (de) * | 2013-07-30 | 2015-02-05 | Sms Siemag Ag | Gießwalzanlage und Verfahren zum Herstellen von Brammen |
| ES2879913T3 (es) * | 2014-11-04 | 2021-11-23 | Primetals Tech Italy S R L | Método para minimizar el coste de producción global de productos metálicos largos |
| EP3338914A1 (de) * | 2016-12-22 | 2018-06-27 | Primetals Technologies Austria GmbH | Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage |
| JP6954188B2 (ja) * | 2018-03-08 | 2021-10-27 | 日本製鉄株式会社 | 連続鋳造鋳片の精整装置列 |
| DE102018207137A1 (de) | 2018-05-08 | 2019-11-14 | Sms Group Gmbh | Gieß-Walz-Anlage, und Verfahren zu deren Betrieb |
| CN109482648B (zh) * | 2018-10-31 | 2020-08-11 | 燕山大学 | Esp生产线粗轧段组织均匀化轧制系统及其方法 |
| DE102020205077A1 (de) | 2019-09-23 | 2021-03-25 | Sms Group Gmbh | Vorrichtung und Verfahren zur Herstellung und Weiterbehandlung von Brammen |
-
2021
- 2021-10-07 DE DE102021211339.7A patent/DE102021211339A1/de active Pending
- 2021-10-12 CN CN202180069899.0A patent/CN116390820B/zh active Active
- 2021-10-12 JP JP2023521728A patent/JP7640686B2/ja active Active
- 2021-10-12 EP EP25168538.4A patent/EP4578570A3/de active Pending
- 2021-10-12 EP EP21794326.5A patent/EP4228835B1/de active Active
- 2021-10-12 FI FIEP21794326.5T patent/FI4228835T3/fi active
- 2021-10-12 US US18/031,038 patent/US12515252B2/en active Active
- 2021-10-12 WO PCT/EP2021/078174 patent/WO2022079027A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US12515252B2 (en) | 2026-01-06 |
| JP2023548661A (ja) | 2023-11-20 |
| EP4578570A3 (de) | 2025-09-24 |
| DE102021211339A1 (de) | 2022-04-14 |
| US20230372998A1 (en) | 2023-11-23 |
| CN116390820B (zh) | 2026-03-24 |
| JP7640686B2 (ja) | 2025-03-05 |
| WO2022079027A1 (de) | 2022-04-21 |
| FI4228835T3 (fi) | 2025-06-18 |
| EP4228835B1 (de) | 2025-04-09 |
| EP4578570A2 (de) | 2025-07-02 |
| CN116390820A (zh) | 2023-07-04 |
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