WO2023156116A1 - Coulée à sec dans une installation combinée de coulée-laminage - Google Patents

Coulée à sec dans une installation combinée de coulée-laminage Download PDF

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Publication number
WO2023156116A1
WO2023156116A1 PCT/EP2023/051136 EP2023051136W WO2023156116A1 WO 2023156116 A1 WO2023156116 A1 WO 2023156116A1 EP 2023051136 W EP2023051136 W EP 2023051136W WO 2023156116 A1 WO2023156116 A1 WO 2023156116A1
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WO
WIPO (PCT)
Prior art keywords
strand
cooling
dry
casting
channel
Prior art date
Application number
PCT/EP2023/051136
Other languages
German (de)
English (en)
Inventor
Josef Watzinger
Simon Grosseiber
Thomas Lengauer
Original Assignee
Primetals Technologies Austria GmbH
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Filing date
Publication date
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Publication of WO2023156116A1 publication Critical patent/WO2023156116A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/0006—Harnesses; Accessories therefor
    • A62B35/0018—Full body harnesses covering at least shoulders and thighs
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/0006—Harnesses; Accessories therefor
    • A62B35/0025—Details and accessories
    • 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
    • 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
    • B21B1/463—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 continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • 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

Definitions

  • the present invention relates to the technical field of combined casting and rolling plants for the production of hot-rolled finished strip.
  • a strand with a slab or thin slab cross section is produced continuously in a continuous casting plant of the combined casting and rolling plant.
  • the continuously cast strand is hot-rolled in the hot state either to form a pre-strip and then to the finished strip or directly from the strand to the finished strip.
  • WO 2021013488 A1 discloses a method for producing a finished steel strip in a combined casting and rolling plant and a combined casting and rolling plant suitable for this purpose. Furthermore, such systems can also be found in CN 104525566 A, WO 2018082966 A1 and WO 2019068444 A1.
  • DE 102011075627 A1 teaches a secondary cooling device within a strand guiding device for cooling a metal strand and a method for operating the secondary cooling device.
  • the strand In the continuous casting plant according to the prior art (see Fig. 1) of an Arvedi ESP type combined casting and rolling plant (see Fig. 4), the strand, after it leaves the mold, is first in a bending zone and in the subsequent curved strand guide using high pressure Cooling nozzles with water (water only), and subsequently in the straightening zone (also called reverse bending zone) and in the horizontal strand guide through cooling nozzles with an air-water mixture (engl. air-mist) cooled.
  • the continuous caster is designed in such a way that the solidification length of the strand (metallurgical length) is smaller than the length of the continuous caster in the most critical production scenario.
  • the metallurgical length can be significantly shorter than the continuous caster length, e.g. when the casting speed is significantly slower than the maximum speed of the continuous caster, e.g. in connection with:
  • a change in the casting format can also have analogous effects.
  • the strand suffers a sometimes considerable temperature loss in the area from the end of the metallurgical length to the exit from the continuous casting plant, which subsequently has a disadvantageous effect in the rolling mill of the combined casting and rolling plant
  • the prior art does not show how the temperature loss of the strand in the continuous casting installation can be reduced even at low casting speeds and how the segments or the strand guide rollers in the continuous casting installation can still be protected from overheating.
  • the object of the invention is to change an existing combined casting-rolling plant and a method for producing a hot-rolled finished strip in such a way that the strand leaves the horizontal strand guide of the continuous casting plant at a high strand temperature even at low casting speeds, but without the segments or .the strand guide rollers overheat.
  • this should increase the energy efficiency of the continuous casting plant in connection with a hot rolling mill.
  • the flexibility in setting the strand temperature is to be increased, which expands the possible operating parameters of the continuous caster from the minimum and maximum possible casting speeds and from the minimum and maximum possible strand thicknesses.
  • a higher strand temperature leads to more scale growth of the strand in the continuous caster, so that the effectiveness of descaling the strand after continuous casting is increased. This measure also improves the surface quality of the pre-strip.
  • the device aspect of the invention is solved by a combined casting and rolling plant for producing a hot-rolled finished strip according to claim 1 .
  • Preferred embodiments are subject of the dependent claims.
  • a combined casting and rolling plant for the production of a hot-rolled finished strip, comprising a continuous casting plant for the continuous casting of a strand with a slab or thin slab cross section made of steel; optionally a strand descaler for descaling the strand; a roughing train with 2, 3 or 4 roughing stands for rough-rolling the billet into a bar; preferably an induction furnace for heating the pre-strip to rolling temperature; optional a pre-strip descaler for descaling the pre-strip; a 4-, 5-, 6-, or 7-stand finishing mill for finish-rolling the sliver to the finished strip; a cooling section for cooling the finished strip down to the coiling temperature; and a coiler for coiling the finished strip.
  • the continuous casting plant comprises: a mold with primary cooling for cooling molten steel, a partially solidified strand with a thin strand shell and a liquid core being formed in the mold and the strand being continuously drawn out of the mold; a bending zone for bending the partially solidified strand from vertical into an arc shape; an arcuate strand guide for supporting, guiding and further cooling the strand; a straightening zone for bending the strand back from the arc shape to the horizontal, the strand being cooled at least in the bending zone, the arc-shaped strand guide and preferably in the straightening zone by cooling nozzles of a secondary cooling system (typically by so-called water-only or air-mist cooling nozzles); and a horizontal strand guide for supporting and guiding the strand.
  • a secondary cooling system typically by so-called water-only or air-mist cooling nozzles
  • the horizontal strand guide has at least one, preferably several (e.g. 2, 3, 4, 5 or more) dry castable segments, wherein the dry cast segments each have several strand guide rollers arranged one behind the other in the transport direction above and several strand guide rollers arranged one behind the other in the transport direction below the strand, wherein the strand guide rollers of the dry casting segments have at least one decentralized, axial cooling duct for cooling with a liquid coolant, preferably cooling water, on the inside of the lateral surface guiding the strand, so that the strand guide rollers do not reach unacceptably high temperatures during a casting sequence in dry operation, with each Dry cast segment has cooling nozzles for cooling the top and bottom of the strand and at least one valve for adjusting the amount of coolant to the cooling nozzles, and wherein a dry cast segment optionally either 1) in dry operation, i.e. without spraying a liquid or liquid-gaseous coolant onto the strand, or 2) can be operated in wet mode, ie by spraying a liquid
  • each dry cast segment also includes a plurality of hydraulic cylinders for adjusting a spacing (and preferably reducing the thickness of the strand) between the strand guide rolls above and below the strand. Due to the several hydraulic cylinders, not only can the distance between the top and bottom strand guide rollers of a dry cast segment be adjusted to different strand thicknesses, but it is also possible to further reduce the strand thickness not only in the curved strand guide, but also in the dry cast segments, whereby the Strand in this area can either be partially solidified (engl. liquid or soft core reductiori) or preferably even solidified (engl. hard reductiori). Through this the internal quality of the strand is improved.
  • this makes it possible to reduce the thickness of the strand (eg, strand thickness of 110 mm) to the finished strip (eg, with a final thickness of 0.6 mm) in the continuous casting plant, which is not inconsiderable. As a result, fewer reduction steps or lower degrees of reduction are necessary in the hot rolling mill, which reduces the complexity of the hot rolling mill.
  • either one or more dry castable dry casting segments are used in the horizontal strand guide for guiding the strand, the strand being guided in a dry casting segment by several strand guide rollers arranged one behind the other in the transport direction above and several strand guide rollers arranged one behind the other in the transport direction below the strand .
  • the dry casting segment has cooling or spray nozzles for cooling the top and bottom of the strand and at least one valve for adjusting the amount of coolant to the cooling nozzles.
  • the strand guide rollers of the dry casting segments are designed in such a way that they do not reach an impermissibly high temperature in dry operation, even during a casting sequence that lasts several hours (e.g. 8 hours).
  • the use of dry-castable dry cast segments in the horizontal strand guide of the continuous caster with cooling nozzles can ensure that the metallurgical length is always smaller than the length of the continuous caster, even at high casting speeds.
  • the cooling intensity of the cooling nozzles in this area can be reduced or completely switched off so that the strand always leaves the continuous caster with the highest possible strand temperature.
  • the cooling channel or the typically several cooling channels have a substantially constant distance from the cylindrical lateral surface, with the decentralized cooling channel (i.e. not arranged centrally in the radial direction) being preferred for cooling the strand guide rollers with a liquid coolant, preferably cooling water, in the axial direction is flown through in the axial and radial direction.
  • the strand guide roller in particular the lateral surface and preferably also the bearings, is cooled by a liquid cooling medium, so that neither the lateral surface nor the bearings of the strand guide roller overheat in dry operation and even when the strand is at a standstill.
  • the cooling channel is at a constant distance from the cylindrical lateral surface and runs along the lateral surface in the axial direction, preferably in the axial and radial direction (ie spirally or helically).
  • the cylindrical lateral surface has a very uniform surface temperature, so that so-called stripes on the strand due to non-uniform cooling are avoided.
  • the cooling medium enters in the longitudinal direction at a first end of the strand guide roller through a feed into a typically central inlet-side channel, the cooling medium is guided from the inlet-side channel through a radial channel to the cooling channel, and then the cooling medium flows through the cooling channel, thereafter, the cooling medium is guided from the cooling channel through a further radial channel into a downstream channel, and the cooling medium leaves the strand guide roll through the downstream channel at a second end of the strand guide roll.
  • the mold has a cavity so that the partially solidified strand fills the mold at the output end with a thickness of 70 to 150 mm, preferably 90 to 130 mm, and a width of 900 to 2500 mm, preferably from 1200 to 2100 mm.
  • the continuous caster has a thermal model for calculating the solidification point of the strand in real time during continuous casting as a function of the overheating of the steel (engl. superheat, i.e. the temperature difference between the temperature and the liquidus temperature of the melt) and preferably the bronze.
  • Composition of the steel melt, the cooling capacity of the primary cooling, the positions and the amounts of coolant applied to the strand of the secondary cooling and the casting speed of the strand are particularly advantageous if the continuous caster has a thermal model for calculating the solidification point of the strand in real time during continuous casting as a function of the overheating of the steel (engl. superheat, i.e. the temperature difference between the temperature and the liquidus temperature of the melt) and preferably the bronze.
  • Composition of the steel melt, the cooling capacity of the primary cooling, the positions and the amounts of coolant applied to the strand of the secondary cooling and the casting speed of the strand are particularly advantageous if the continuous caster has a thermal model for calculating the solidification point
  • the solidification point can be determined online during continuous casting, so that it is subsequently possible to adjust the cooling in the horizontal strand guide accordingly during continuous casting.
  • valve or valves for adjusting the amount of coolant to the spray nozzles are connected to the thermal model in terms of signals, so that a dry cast segment can be operated either dry or wet in the transport direction.
  • another induction furnace for heating the strand preferably an inductive edge heater for heating the edges of the strand, is arranged between the last dry-casting segment of the continuous caster and the roughing train, preferably between the last dry-casting segment of the continuous caster and the strand descaler. This avoids "cold" strand edges, which improves the quality of the finished strip.
  • the solution is provided by a method for producing a hot-rolled finished strip in a combined casting and rolling plant, comprising the method steps: continuous casting of a strand with a slab or thin slab cross section made of steel in a continuous casting plant; optionally descaling the strand by a strand descaler; rough-rolling the billet into a pre-strip by a roughing train with 2, 3 or 4 roughing stands; preferably heating the sliver to rolling temperature by an induction furnace; optional descaling of the pre-strip by a pre-strip descaler; finish-rolling the sliver into the finished strip by a 4-, 5-, 6-, or 7-stand finishing mill; Cooling of the finished strip to coiling temperature in a cooling section; and coiling the finished strip in a coiler.
  • Continuous casting comprises the following process steps: Cooling of a steel melt by primary cooling in a vertical mold, a partially solidified strand with a thin strand shell and a liquid core being formed and the partially solidified strand being continuously drawn out of the mold; bending the partially solidified strand from vertical into an arcuate shape in a bending zone; supporting, guiding and cooling the strand in an arcuate strand guide; Bending back or straightening the strand from the arc shape to the horizontal in a straightening zone, the strand being cooled at least when bending in the arc-shaped strand guide and preferably when bending back by cooling nozzles of a secondary cooling system; and supporting and guiding the strand in a horizontal strand guide.
  • the process according to the invention is characterized in that the strand is guided in the horizontal strand guide through at least one, preferably through several, dry casting segments, with the strand between several strand guide rollers arranged one behind the other in the transport direction above and several strand guide rollers arranged one behind the other in the transport direction below the Strand is guided, wherein the strand guide rollers of the dry casting segments have at least one decentralized, axial cooling channel on the inside of the cylindrical lateral surface guiding the strand. Flow of a liquid coolant through the cooling channel, so that the strand guide rollers in the Do not reach impermissibly high temperatures in dry operation.
  • each dry cast segment comprises cooling nozzles for cooling the top and bottom of the strand and has at least one valve for adjusting the amount of coolant to the cooling nozzles, Adjusting an amount of coolant to the cooling nozzles, wherein a dry cast segment operates either 1) dry, ie without a liquid or liquid spraying gaseous coolant onto the strand, or in 2) wet operation, ie by spraying a liquid or liquid-gaseous coolant onto the strand.
  • the valve is closed during the transition from wet operation to dry operation, and the valve is at least partially opened during a transition from dry operation to wet operation.
  • the coolant When flowing through, the coolant preferably has a constant distance from the lateral surface, with the flow preferably taking place in the axial and radial direction.
  • the cooling medium enters in the longitudinal direction of the strand guide roller at a first end through a feed into a channel on the inlet side, the cooling medium is then guided from the channel on the inlet side through a radial channel to the cooling channel on the inside of the lateral surface, and the cooling medium then flows through the cooling channel, subsequently the cooling medium is guided from the cooling channel through a further radial channel to a downstream channel, and finally the cooling medium leaves the strand guide roll through the downstream channel at a second end.
  • the strand has a thickness of 70 to 150 mm, preferably between 90 and 120 mm, a width of 900 to 2500 mm, preferably from 1200 to 2100 mm, at the output end of the mold mm, and a casting speed between 3 and 8 m/min.
  • a thermal model calculates the solidification point of the strand in real time during continuous casting as a function of the overheating of the steel (superheat) and preferably the bronze. Composition of the steel melt, the cooling capacity of the primary cooling, the positions and the amount of coolant applied to the strand of the secondary cooling and the casting speed of the strand are calculated.
  • the at least one dry cast segment is preferably operated wet in the transport direction before the solidification point and the at least one dry cast segment is operated dry in the transport direction after the solidification point. This measure ensures that the strand leaves the continuous casting installation at the highest possible temperature.
  • a distance between the strand guide rollers above and below the strand is adjusted by a plurality of hydraulic cylinders and preferably the partially solidified or solidified strand is reduced in thickness by changing the distance between the strand guide rollers above and below the strand by means of the hydraulic cylinder.
  • the thickness of the partially solidified or fully solidified strand is reduced.
  • FIG. 1 shows a representation of the cooling media used in different areas of a continuous casting plant for the continuous casting of a strand with a slab or thin slab cross section made of steel, according to the prior art
  • FIG. 2 shows a representation of the cooling media used in different areas of a continuous casting plant for continuous casting of a strand with a slab or thin slab cross section made of steel
  • FIG. 3 shows a perspective view of a dry cast segment for a continuous casting plant of a combined casting and rolling plant according to the invention
  • 5 shows a schematic representation of an Arvedi ESP type composite casting/rolling system according to the invention
  • 6 shows a schematic representation of a first internally cooled strand guide roller for a dry cast segment
  • FIG. 7 shows a schematic representation of a second internally cooled strand guide roll for a dry cast segment
  • FIG. 8 shows a schematic representation of the calculation of the solidification point of the strand using a thermal model and the transition from wet to dry operation in a dry casting segment.
  • FIG. 4 shows a schematic of an Arvedi-ESP type combined casting and rolling plant according to the prior art with a continuous casting plant 1 (see FIG. 1) for the continuous casting of a strand of steel with a slab or thin slab cross section with a thickness between 80 and 100 mm , a pre-rolling train 10 with three pre-rolling stands R1 ... R3 for pre-rolling the hot strand into a pre-strip, an induction furnace 11 for heating the pre-strip to rolling temperature, a pre-strip descaler 12 for descaling the heated pre-strip, a finishing train 13 with five finishing rolling stands F1.
  • this combined casting-rolling system is typically operated in continuous operation, so that the strand from the continuous casting system 1 uncut into the roughing train 10, the pre-strip from the roughing train 10 uncut into the finishing train 13 and the finished strip is first cut through the shears 15 immediately before being coiled becomes.
  • FIG. 1 shows the continuous casting plant 1 from FIG. 4 in more detail.
  • molten steel is cooled by a primary cooling system 7, so that a partially solidified strand with a thin strand shell and a liquid core is formed.
  • the partially solidified strand 41 is continuously drawn out of the mold 2.
  • the partially solidified strand is then bent into an arc shape in the bending zone 3 and guided along the arcuate strand guide 4 by strand guide segments.
  • the strand is bent back into the horizontal and runs into the horizontal strand guide 6 .
  • the strand 41 is directly below the mold 2, the bending zone 3, the arcuate strand guide 4 and in the Straightening zone 5 is cooled by cooling nozzles of a high-pressure water spray cooling system 8 and in the horizontal strand guide 6 by cooling nozzles of an air-water cooling system 9 .
  • the strand guide segments in the horizontal strand guide 6 of the continuous casting plant 1 cannot be dry cast, i.e. the strand must also be further cooled in this area in order to prevent the strand guide segments, e.g. the hydraulic cylinders, from overheating To prevent strand guide rollers or the nozzle tips of the cooling nozzles.
  • the solidification point of the strand in the transport direction T is not exactly known, so that to avoid a strand that has not completely solidified at the end of the horizontal strand guide 6, a strand that may already have solidified is further cooled.
  • a dry cast segment 20 is shown in FIG.
  • the strand which is not shown here, is guided by a number of strand guide rollers 21 below and above the strand.
  • the strand guide rollers 21 of the dry casting segment 20 are internally cooled strand guide rollers that have a decentralized cooling channel 26 (see FIGS. 6 and 7, each with an example of such a strand guide roller) below the lateral surface 25.
  • the internal cooling is particularly efficient, so that the red-hot strand in dry operation does not overheat the strand guide rollers, even when the machine is at a standstill.
  • the dry casting segment 20 has four hydraulic cylinders 22 for changing the distance between the lower and upper strand guide rollers 21 .
  • the thickness of the strand can be reduced by the hydraulic cylinders 22 in conjunction with the strand guide rollers 21 .
  • the strand is assigned an English subjected to hard reduction, soft reduction or liquid core reduction.
  • the dry cast segment 20 can be operated either in dry operation or in wet operation. In wet operation, typically several spray Cooling nozzles 23 on the top and bottom of the dry casting segment 20 apply a cooling medium (either liquid cooling water or an air-water mixed air-mist) to the strand.
  • the drying segment 20 has heat shields 42 for shielding the hydraulic cylinders 22 from the heat of the typically red-hot steel strand 41.
  • the heat shields enclose the hydraulic cylinders 22 towards the string so that the radiant heat from the string does not damage the hydraulic cylinders 22.
  • FIG. 5 shows an Arvedi ESP type combined casting and rolling plant according to the invention with a continuous casting plant 1 with two dry casting segments 20 in the area of the horizontal strand guide 6 and a strand descaler 43 after the last dry casting segment 20 and before the first roughing stand R1 of the roughing train 10 .
  • the remaining units are arranged as in FIG.
  • FIG. 6 shows a first embodiment of an internally cooled strand guide roller 21 which can be used in the dry casting segments 20.
  • a three-crowned strand guide roller is involved, which is supported in the axial direction x by bearings 27, here, for example, roller or spherical roller bearings.
  • the liquid cooling medium (cooling water) flows through a feed (not shown)--here a rotary feed--into the channel 29 on the inlet side.
  • the inflow-side channel 29 is arranged centrally, with the cooling water also cooling the area of the leftmost bearing 27 .
  • the cooling water flows from the inlet-side channel 29 through a radial channel 30 to a plurality of cooling channels 26 which are at a constant distance from the lateral surface 25 .
  • the cooling channels 26 flow through the jacket of the strand guide roller 21 in the axial direction x. There are plugs at the ends of the cooling channels 26 so that the cooling water cannot escape.
  • the cooling channels 26 are evenly distributed over the circumference of the lateral surface 25, so that the lateral surface 25 is evenly cooled.
  • another radial channel 30 connects the cooling channel 26 to the central channel.
  • a plug 44 is provided to prevent a hydraulic short circuit.
  • the cooling water is then fed through the central channel to the second (here middle) bale and cools it in an analogous manner.
  • the cooling water is led through another central channel to the third (here on the right) bale and cools it in an analogous way.
  • the cooling water is discharged through a channel 31 on the outlet side through a rotary feedthrough.
  • FIG. 7 shows a second embodiment of an internally cooled strand guide roller 21 that can be used in the dry casting segments 20. Also in this case delt it is a three-crowned strand guide roller, which is mounted four times in the axial direction x by bearings 27. At the first end 28a of the strand guide roller 21, liquid cooling water flows through a feed, not shown—here a rotary feed—into the channel 29 on the inlet side. The inflow-side channel 29 is arranged centrally, with the cooling water also cooling the area of the leftmost bearing 27 .
  • the cooling water flows from the inlet-side channel 29 through a radial channel 30 to the cooling channel 26 which has a constant distance from the lateral surface 25 and runs below the lateral surface 25 in the axial x and radial direction (ie spirally). Since the cooling channel extends in a spiral shape, the lateral surface 25 is evenly and strongly cooled.
  • another radial channel 30 connects the cooling channel 26 to the central channel.
  • the cooling water is then fed through the central channel to the second (here middle) bale and cools it in an analogous manner. Then the cooling water is led through another central channel to the third (here on the right) bale and cools it in an analogous way.
  • the cooling water is discharged through a channel 31 on the outlet side through a rotary feedthrough.
  • a thermal model 33 calculates the overheating (superheat) of the steel 34 and the brazen steel using the input variables.
  • the solidification point DP is greater than the position of the dry casting segment Pos., the valve 24, which can close or open the coolant supply to the cooling nozzles 23 of the dry casting segment 20, is opened so that the strand 41 in the dry casting segment 20 is cooled.
  • valve 24 is closed.
  • the cooling medium is conveyed from a tank 39 by a pump 40 and supplies the cooling nozzles 23 via the valve 24.
  • a single thermal model 33 it is of course possible for a single thermal model 33 to be used to determine the operating mode of a plurality of dry cast segments 20.
  • the valve 24 is not a switching valve with two positions (fully open or closed), but is designed as a continuous valve which, depending on the control, can assume any position between fully open and fully closed. In this way, for example, the strand temperature at the end of the horizontal strand guide 6 can be measured and regulated to a specific strand temperature via the coolant quantity to the cooling nozzles 23 .

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  • Health & Medical Sciences (AREA)
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Abstract

L'invention se rapporte au domaine technique de l'installation combinée de coulée-laminage permettant la production de bandes finies laminées à chaud. L'objectif de l'invention est de modifier une installation combinée de coulée-laminage existante et un procédé de production d'une bande finie laminée à chaud de sorte que la ligne de coulée continue quitte le guide de ligne de coulée continue horizontal de l'installation de coulée continue à une température de ligne de coulée continue élevée même à de faibles vitesses de coulée, mais sans que les segments ou les rouleaux de guidage de ligne de coulée continue ne surchauffent. Le guide de ligne de coulée continue horizontal (6) de l'installation de coulée continue présente au moins un segment, de préférence plusieurs segments de coulée à sec pour matériaux coulables à sec (20), les segments de coulée à sec (20) ayant chacun une pluralité de rouleaux de guidage de ligne de coulée continue, disposés les uns derrière les autres dans la direction de transport (T), au-dessus et au-dessous de la ligne de coulée continue (41), les rouleaux de guidage de ligne de coulée continue des segments de coulée à sec (20) ayant, sur l'intérieur de la surface latérale guidant la ligne de coulée continue (41), au moins un canal de refroidissement axial excentré permettant le refroidissement au moyen d'un fluide de refroidissement de sorte que les rouleaux de guidage de ligne de coulée continue n'atteignent pas de hautes températures non autorisées pendant une séquence de coulée en fonctionnement à sec (32), chaque segment de coulée à sec (20) présentant des buses de refroidissement pour refroidir les côtés supérieur et inférieur de la ligne de coulée continue (41) et au moins une soupape pour ajuster la quantité de fluide de refroidissement aux buses de refroidissement, et un de segment de coulée à sec (20) pouvant être sélectivement actionné soit 1) en fonctionnement à sec (32), c'est-à-dire sans pulvérisation de fluide de refroidissement liquide ou liquide-gaz sur la ligne de coulée continue (41), soit 2) en fonctionnement humide, c'est-à-dire par pulvérisation d'un fluide de refroidissement liquide ou liquide-gaz sur la ligne de coulée continue (41).
PCT/EP2023/051136 2022-02-18 2023-01-18 Coulée à sec dans une installation combinée de coulée-laminage WO2023156116A1 (fr)

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ATA50111/2022A AT525563B1 (de) 2022-02-18 2022-02-18 Trockengiessen in einer giess-walz-verbundanlage
ATA50111/2022 2022-02-18

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EP3437759A1 (fr) * 2017-08-04 2019-02-06 Primetals Technologies Austria GmbH Coulée continue d'une barre métallique
WO2019068444A1 (fr) 2017-10-03 2019-04-11 Primetals Technologies Austria GmbH Procédé pour faire fonctionner une installation combinée de coulée et de laminage
WO2021013488A1 (fr) 2019-07-24 2021-01-28 Primetals Technologies Austria GmbH Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage
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WO2019068444A1 (fr) 2017-10-03 2019-04-11 Primetals Technologies Austria GmbH Procédé pour faire fonctionner une installation combinée de coulée et de laminage
WO2021013488A1 (fr) 2019-07-24 2021-01-28 Primetals Technologies Austria GmbH Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage
DE102020209794A1 (de) * 2020-08-04 2022-02-10 Sms Group Gmbh Verfahren zur Steuerung oder Regelung der Temperatur eines Gießstrangs in einer Stranggießanlage

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