US20250129444A1 - System and method for producing flat rolled products - Google Patents

System and method for producing flat rolled products Download PDF

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Publication number
US20250129444A1
US20250129444A1 US18/695,875 US202218695875A US2025129444A1 US 20250129444 A1 US20250129444 A1 US 20250129444A1 US 202218695875 A US202218695875 A US 202218695875A US 2025129444 A1 US2025129444 A1 US 2025129444A1
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Prior art keywords
thick
slab
rolling
slabs
hot
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US18/695,875
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English (en)
Inventor
Wolfgang Fuchs
Georg Padberg
Matthias Peters
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SMS Group GmbH
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SMS Group GmbH
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Priority claimed from DE102022208767.4A external-priority patent/DE102022208767A1/de
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Publication of US20250129444A1 publication Critical patent/US20250129444A1/en
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/04—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B2001/028—Slabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/06—Width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/004—Transverse moving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the present disclosure relates to a system and to a method for producing flat rolled products from thick-cast steel and/or non-iron metal slabs and, in a further aspect, to the use of at least one electric heating device, in particular an electric heating device for a direct hot charging process, arranged in front of a hot-rolling mill in the transport direction, for heating thick slabs having a thickness of at least 160 mm to a hot-rolling temperature.
  • at least one electric heating device in particular an electric heating device for a direct hot charging process, arranged in front of a hot-rolling mill in the transport direction, for heating thick slabs having a thickness of at least 160 mm to a hot-rolling temperature.
  • Japanese patent JP 6562223 B2 describes a system by means of which thick slabs are fed directly to a hot-rolling mill using the casting heat. Thereby, the edges of the thick slabs are heated to a corresponding hot-rolling temperature by a series of inductive edge heaters arranged one behind the other. The targeted heating of the edges suppresses the cooling of the slab center section, but such a heating device does not enable the targeted heating of the entire thick slab.
  • the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs comprises a continuous casting device, by means of which a continually cast product with a thickness of at least 160 mm can be continually cast; a separating device arranged so as to adjoin the continuous casting device, by means of which the flat continually cast product can be separated into individual thick slabs; a hot-rolling mill, by means of which the thick slabs can be rolled into the flat rolled product, wherein the hot-rolling mill comprises a pre-rolling train and a finishing rolling train in each case with at least one rolling mill stand and is arranged in a common (first) transport line with the at least one continuous casting device; at least one thick slab supplying device arranged transversely to the transport line and positioned between the separating device and the rolling train; along with at least one electric heating device for a direct hot charging process arranged in the transport direction in front of the hot-rolling mill, in particular in the transport direction in front of the pre-rolling train, by means of which at least those thick slab
  • the thick slabs can be heated to the predetermined rolling temperature as required.
  • the at least one electric heating device for a direct hot charging process arranged in the transport direction in front of the hot-rolling mill, in particular in the transport direction in front of the pre-rolling train, thus enables individual temperature control of the steel grade being cast.
  • the term “thick slab” is understood to mean a slab that has a minimum thickness of at least 160 mm, preferably a minimum thickness of at least 180 mm, more preferably a minimum thickness of at least 200 mm. Since the maximum thickness of the thick slabs is technologically limited due to the continuous casting devices currently available, the maximum thickness of the thick slabs is preferably 300 mm, more preferably 250 mm. Such thick slabs typically have widths in the range of 800 to 2500 mm, preferably widths in the range of 1000 to 2300 mm.
  • thick slabs as opposed to thin slabs has several positive effects.
  • the throughput alone can increase the output quantity, such that a higher degree of utilization can be achieved with the hot-rolling mill.
  • Thick slabs also have a considerable advantage over thin slabs in terms of quality.
  • thick slabs Compared to thin slabs, thick slabs have a smaller surface area per cast ton of material. Temperature inhomogeneities of slabs transported in the transport line can be reduced. Due to the smaller surfaces in relation to each ton of cast material, the formation of scale is reduced, resulting in fewer casting residues and surface defects, as a result of which material losses due to their removal can be reduced.
  • the term “electric heating device,” which is also referred to in the present application as an electric heating device for a direct hot charging process, an electric thick slab preheating device, an electric thick slab reheating device, an electric pre-strip heating device or an electric supplementary thick slab heating device, is generally understood to mean an electrically operable device by means of which the thick slabs can be heated by means of electric current.
  • the electric heating device can advantageously comprise inductive heating devices, conductive heating devices and/or electric heating devices with indirect resistance heating. It is particularly preferred that the electric heating device is an inductive heating device or a conductive heating device. Due to the thickness range of the thick slabs, an inductive heating device can be operated advantageously according to the longitudinal field principle and enables rapid heating due to the high energy density. With a conductive heating device, the respective thick slab forms part of the circuit and is therefore heated directly by the electric current passing through it, as a result of which a very high degree of efficiency (close to 1) and a particularly rapid heating is enabled.
  • An inductive and/or conductive electric heating device also has the advantage that it can be designed as a series connection of individual units for both the core and the regions close to the surface of the thick slabs.
  • an electric tunnel furnace operated via resistance heating can also be provided.
  • the system can be used to set a temperature profile in the respective thick slab, which is specifically adapted to the subsequent pre-rolling process, in particular the cooling that occurs during pre-rolling. If cold spots (so-called “skid marks”) are detected on the thick slab surface, for example upon the use of walking beam furnaces, they can be specifically removed by localized heating, as a result of which the quality of the flat rolled product that is then produced can be improved. The short heating times also reduce the formation of scale, as a result of which both the output quantity and the surface quality can be improved. In addition, the system enables the individual heating of each thick slab to the temperature level required for the respective technology without overheating or undercooling.
  • the term “entire surface” means that the thick slabs are heated to a predetermined nominal temperature over their entire surface and in a specific thickness upon passing through the electric heating device.
  • the nominal temperature of the thick slab is largely uniform and/or identical in three-dimensional extension, wherein permissible temperature differences amount to ⁇ 80° C., preferably ⁇ 50° C., particularly preferably ⁇ 20° C. of a target/nominal temperature.
  • Non-uniformly heated thick slabs can lead to variable forming conditions during further processing, for example during rolling, such that no uniform forming takes place over the length and/or width of the thick slab, thus increasing the proportion of scrap in the necessary finishing cuts.
  • Non-uniform temperatures can also cause non-uniform changes in the microstructure, along with as geometric defects such as, for example, flatness defects. By setting a uniform temperature level over the entire surface at an early stage, these problems and defects can be avoided or at least limited. Complex set-up and processes to compensate for such defects can be simplified or even eliminated. Interference between desired influences and reactions resulting from a non-uniform temperature level is also minimized.
  • the electric heating device for a direct hot charging process is designed in such a manner that the thick slabs can be heated over their entire surface.
  • a heating device enables not only specific heating of the edges, but also heating of the central part of the thick slab located between the edges.
  • a further advantage of such an electric heating device for a direct hot charging process arranged in the transport direction in front of the hot-rolling mill, in particular in the transport direction in front of the pre-rolling train, is that this enables maximum utilization of the casting heat, as a result of which energy savings of more than 70% are possible compared to conventional removal from a slab store.
  • the present system is only suitable and intended for producing flat rolled products from thick-cast steel and/or non-iron metal slabs.
  • the thick slabs then produced can be stored temporarily without any problems or easily transported from a second transport line due to their typical dimensions, in contrast to systems intended for producing thin slabs.
  • Thick slabs usually have a length of less than 12 meters, sometimes less than 10 meters, whereas thin slabs usually have lengths of at least 25 meters and are therefore more complex to transport and store.
  • the flat rolled products of such systems also differ from systems intended for producing thin slabs. This means that specific steel grades, such as, for example, peritectic steel grades or steel grades with very high surface quality requirements, cannot be produced in the required quality on conventional thin slab systems.
  • the length of a particular thick slab in particular for a direct hot charging process, can correspond not only to a single coil length but also to a multiple thereof, since transport across the transport line and further handling steps are not required.
  • the continuous casting device is designed in such a manner that, by means of it, a continually cast product with a thickness of at least 160 mm can be continually cast.
  • the continuous casting device can, for example, be designed as a single-strand or multi-strand continuous casting device.
  • the system can comprise at least one electric pre-strip heating device arranged in the transport direction in front of the finishing rolling train, which is particularly preferably designed in such a manner that the rolled flat rolled pre-product can be heated over its entire surface.
  • These can be used to heat the rolled flat rolled pre-products, which leave the pre-rolling train at a temperature of below 1000° C., for example, in a particularly energy-efficient manner to a temperature specifically predetermined for the finish rolling process, as a result of which the desired properties of the flat rolled product can be set.
  • effective compensation can be provided for temperature differences between the head and the end of a rolled flat rolled pre-product, as a result of which greater rolling stability and thus higher output are enabled.
  • the resulting more homogeneous temperature distribution also enables lower final strip thicknesses and more homogeneous mechanical properties of the flat rolled product produced.
  • the at least one thick slab supplying device is preferably designed as a transport and heating device, by means of which the transported and/or temporarily stored thick slabs can be heated to the hot-rolling temperature, if necessary over their entire surface.
  • the transport and heating device can be designed in such a manner that, simultaneously or sequentially with the transport, a temperature increase or a holding of the temperature is enabled.
  • the thick slab supplying device is designed in the form of a walking beam furnace, which comprises at least one segment that comprises electrically operated heating elements and/or gas-powered burners.
  • a system designed in this manner thus comprises a first transport line, by means of which the thick slabs can be heated to the hot-rolling temperature for a short time using the casting heat by means of the electric heating device for a direct hot charging process and subsequently fed to the hot-rolling mill.
  • a second transport line can also be provided, by means of which thick slabs that have been temporarily stored and/or cooled to 400 to 800° C., which are usually stored in a slab store and/or a soaking pit, are heated directly to the hot-rolling temperature via the thick slab supplying device and then fed to the rolling process.
  • thick slabs cast in a second continuous casting device can also be fed to the rolling process via the thick slab supplying device.
  • the at least one, preferably two or a plurality of thick slab supplying devices are arranged between the electric heating device for the direct hot charging process and the pre-rolling train.
  • the system can also comprise at least one, preferably two or a plurality of the thick slab supplying devices between the separating device and the electric heating device for the direct hot charging process.
  • At least one electric thick slab preheating device can preferably be connected upstream on the inlet side, which is preferably designed in such a manner that the thick slabs can be heated over their entire surface.
  • the electric thick slab preheating device is particularly suitable if higher temperatures are required for a short time to set the mechanical properties, such as, for example, the strength, of the flat rolled products to be produced and the thick slab supplying device that subsequently passes through can be operated at a lower temperature level required for the flat rolled products to be produced.
  • At least one electric thick slab reheating device can be connected downstream of the at least one thick slab supplying device on the outlet side, which is particularly preferably designed in such a manner that the thick slabs can be heated over their entire surface.
  • the at least one electric thick slab reheating device is arranged between the at least one thick slab supplying device and the pre-rolling train.
  • the electric thick-slab reheating device on the outlet side further increases the flexibility of the system in order to optimize energy production, on the one hand, and to meet the logistical and technological requirements of the rolling mill in the best possible manner, on the other hand.
  • the system can comprise at least one supplementary electric thick slab heating device, which is preferably connected upstream of the at least one electric thick slab reheating device.
  • the rolling mill should enable specific rolling program profiles, since the availability in the hot-rolling mill is reduced by an increase in the number of necessary work roll changes upon the use of the same slab widths.
  • the pre-rolling train therefore comprises at least one upsetting device in addition to a first and/or a second pre-rolling stand in the transport direction.
  • the upsetting device comprises at least one slab upsetting press and/or, if applicable, at least one, preferably a plurality of, upsetting presses.
  • an upsetting device such as the slab upsetting press, if applicable in combination with at least one upsetting press, a necessary width-related and profile-related optimized rolling program can be ensured, since larger and/or constant slab widths can be cast.
  • the upsetting device is designed in such a manner that the slab width can be reduced by up to 450 mm, preferably up to 350 mm.
  • additional upsetting presses enables a further reduction in slab width of up to 100 mm per upsetting press.
  • the system can comprise a control device with an associated calculation unit, wherein the control device is designed to control and/or regulate the system on the basis of a minimized energy consumption and/or a maximum throughput, and/or on the basis of product properties and/or product dimensions.
  • the calculation unit can preferably use a physical process model that maps the thermal conditions and determines suggestions for setting the system.
  • control device can control the system in such a manner that maximum throughput is achieved.
  • groups of batches in special thickness, width and/or length dimensions can be formed by optimizing the casting sequences, the insertion sequences, the transport device and/or by operating the rolling mill at the design limit, by means of which throughput can be increased.
  • maintenance cycles such as roll change times, mold change times and/or mold changeover times can be taken into account.
  • Grouping batches and/or sequences according to product dimensions has the advantage that material losses due to transition pieces in the event of width or thickness changes can be avoided as far as possible.
  • the system can also be controlled by the calculation unit according to product properties.
  • the calculation unit can set a correspondingly slow casting speed, stronger descaling, corresponding temperature control, etc.
  • the setting of the system can be optimized to achieve optimum magnetic, mechanical and/or geometric properties.
  • the system can also comprise a plurality of specifically arranged thermal insulation hoods.
  • the thermal insulation hoods can be designed as passive or active thermal insulation hoods.
  • the active thermal insulation hoods are preferably operated with burners using hydrogen produced by “green” means as fuel, or electrically.
  • the system can comprise a plurality of thermal insulation hoods between the separating device and the electric heating device for the direct hot charging process and, if applicable, between the electric heating device for the direct hot charging process and the hot-rolling mill, in particular the pre-rolling train.
  • the system can also comprise a plurality of thermal insulation hoods within the pre-rolling train. These can, for example, be arranged in the transport direction in front of and/or behind an upsetting device, and, if applicable, in front of and/or behind each pre-rolling stand.
  • the present disclosure also relates to a method for producing flat rolled products from thick-cast steel and/or non-iron metal slabs, preferably by means of the system, comprising the following method steps:
  • the thick slabs are fed to the first electric heating device for a direct hot charging process at a temperature of at least 500° C.
  • the pre-rolled flat rolled product pre-rolled flat rolled product to be heated to a temperature of at least 950° C. by means of an electric pre-strip heating device before it is finish-rolled into the flat rolled product.
  • the present disclosure also relates to a use of at least one electric heating device for a direct hot charging process, in particular an inductive heating device, arranged in the transport direction in front of a hot-rolling mill, for heating thick slabs having a thickness of at least 160 mm to a hot-rolling temperature.
  • at least one electric heating device for a direct hot charging process in particular an inductive heating device, arranged in the transport direction in front of a hot-rolling mill, for heating thick slabs having a thickness of at least 160 mm to a hot-rolling temperature.
  • FIG. 1 shows an embodiment of the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs
  • FIG. 2 shows a second embodiment of the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs
  • FIG. 3 shows a third embodiment of the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs
  • FIG. 4 shows a fourth embodiment of the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs
  • FIG. 5 shows a fifth embodiment of the system for producing flat rolled products from thick-cast steel and/or non-iron metal slabs
  • FIG. 6 shows an embodiment of a pre-rolling train.
  • FIG. 1 shows a first embodiment of a system 1 for producing rolled products from thick-cast steel and/or non-iron metal slabs.
  • the system 1 comprises a continuous casting device 3 arranged in a transport line T, which in the present case is configured to continually cast a continually cast product with a thickness in the range from 200 to 250 mm.
  • the resulting continually cast product (not shown) is then immediately separated into individual thick slabs by means of a separating device 4 , for example a pendulum shear or a continually cast product burning device, and fed directly to a hot-rolling mill 5 while using the casting heat, where it is initially pre-rolled and subsequently finish-rolled.
  • a separating device 4 for example a pendulum shear or a continually cast product burning device
  • the thick slabs usually cool down to an average temperature of 800 to 900° C. on the transport route to hot-rolling mill 5 . It is therefore provided that the thick slabs are heated over their entire surface to a hot-rolling temperature of 1100 to 1300° C. in the transport direction in front of the hot-rolling mill 5 by means of an electric heating device for the direct hot charging process 7 .
  • the electric heating device 7 is designed as a longitudinal field inductor in the present exemplary embodiment and thus enables the cooled thick slab to be heated to the specific hot-rolling temperature for a short time.
  • the embodiment shown in FIG. 1 comprises a control device S, which includes a calculation unit B. This can determine those operating settings that minimize energy consumption.
  • the control device S is connected to the system 1 by means of signals and undertakes the necessary settings for the system 1 to produce the thick slab.
  • the operating settings can be optimized additionally and/or alternatively according to maximum throughput and/or product properties and/or product dimensions.
  • FIG. 2 shows a second embodiment of the system 1 for producing flat rolled products from thick-cast steel and/or non-iron metal slabs.
  • the system 1 additionally comprises an electric pre-strip heating device 10 between a pre-rolling train 8 and a finishing rolling train 9 of the hot-rolling mill 5 .
  • the electric pre-strip heating device 10 is also designed as a longitudinal field inductor/inductor combination in such a manner that the pre-rolled flat rolled products can be heated over their entire surface.
  • the pre-rolled flat rolled products which leave the pre-rolling train 8 at a temperature of less than 1100° C., are heated to a temperature of 950 to 1100° C., which is specifically predetermined for the finish rolling process, in a particularly energy-efficient manner.
  • FIG. 3 shows a third embodiment of the system 1 for producing flat rolled products from thick-cast steel and/or non-iron metal slabs.
  • the system 1 comprises a second transport line T 2 arranged parallel to the first transport line T 1 and comprising a second roller table 6 . 2 , a second continuous casting device 11 , which is also configured to continually cast a continually cast product with a thickness in the range from 200 to 250 mm, along with a second separating device 12 .
  • the second separating device 12 can also take the form of a pendulum shear or a continually cast product burning device.
  • the second roller table 6 . 2 can also be covered segment-by-segment with a plurality of active or passive thermal insulation hoods 22 .
  • the thick slabs produced in this line can be temporarily stored and cooled in a slab store 13 arranged so as to directly adjoin the second separating device 12 . Furthermore, the individual thick slabs can be temporarily stored in a soaking pit 14 with lower temperature losses.
  • the system 1 in this embodiment also comprises a thick slab supplying device 15 , which is designed as a gas-operated transport and heating device.
  • the thick slab supplying device 15 is arranged between the electric heating device for the direct hot charging process 7 and the pre-rolling train 8 and transverse to the transport direction.
  • the system 1 comprises two electric thick slab preheating devices 16 . 1 , 16 . 2 , which are connected upstream of the thick slab supplying device 15 on the inlet side.
  • the two preheating devices 16 . 1 , 16 . 2 are also designed as longitudinal field inductors/inductor combinations in such a manner that the thick slabs can be heated over their entire surface.
  • FIGS. 4 and 5 show two alternative embodiments of the system 1 for producing flat rolled products from thick-cast steel and/or non-iron metal slabs.
  • the system 1 comprises a sequence of two electric heating devices 7 , 17 , which are arranged in the transport direction between the slab store 13 and the pre-rolling train 8 .
  • a sequence of three electric heating devices 7 , 17 , 18 is arranged between the slab store 13 and the pre-rolling train 8 in the embodiment in accordance with FIG. 5 .
  • the embodiment shown in FIG. 5 comprises the electric heating devices 16 . 1 , 16 . 2 arranged in the second transport line T 2 .
  • This large number of heating devices 7 , 16 . 1 , 16 . 2 , 17 , 18 makes it possible to design and operate them in a particularly individual and performance-related manner without power losses or an oversized design.
  • All heating devices 7 , 10 , 16 . 1 , 16 . 2 , 17 , 18 of the exemplary embodiments are only shown schematically and usually comprise a number of individual inductors, which can be passed through sequentially. Individual switch-on and switch-off, along with an individual power setting, enable a very precise setting of the desired/necessary temperature increase. In addition to inductors designed exclusively as longitudinal field inductors, there are also combination sequences of longitudinal field and transverse field inductors that can be passed through sequentially.
  • further thick slabs can also be introduced into the first transport line T 1 by the thick slab supplying device 15 , namely at a position arranged upstream or downstream of the heating device for the direct hot charging process 7 .
  • the fully or partially cooled thick slabs can be fed from a slab store 13 into the thick slab supplying device 15 and simultaneously heated to a hot-rolling temperature and transported.
  • further thick slabs can also be introduced into the first transport line T 1 by the thick slab supplying device 15 , namely at a position arranged in front of the heating device for the direct hot charging process 7 .
  • the fully or partially cooled thick slabs can be fed from a slab store 13 or alternatively from a soaking pit 14 into the thick slab supplying device 15 and simultaneously heated to a hot-rolling temperature and transported.
  • FIG. 6 further shows an embodiment of a pre-rolling train 8 , which comprises an upsetting device 19 in the transport direction, along with at least a first and preferably a second pre-rolling stand 20 , 21 , each of which has a horizontal stand and preferably a vertical stand.
  • a series of thermal insulation hoods 22 is provided.

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  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
US18/695,875 2021-10-01 2022-09-29 System and method for producing flat rolled products Pending US20250129444A1 (en)

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DE102022208767.4 2022-08-24
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US20170002439A1 (en) * 2014-01-17 2017-01-05 Danieli & C. Officine Meccaniche Spa Plant and method for the production of metal
JP6152839B2 (ja) 2014-10-09 2017-06-28 Ｊｆｅスチール株式会社 熱延鋼板の製造設備および製造方法
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