EP3558563B1 - Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, et installation combinee de coulee et de laminage - Google Patents

Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, et installation combinee de coulee et de laminage Download PDF

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Publication number
EP3558563B1
EP3558563B1 EP17826509.6A EP17826509A EP3558563B1 EP 3558563 B1 EP3558563 B1 EP 3558563B1 EP 17826509 A EP17826509 A EP 17826509A EP 3558563 B1 EP3558563 B1 EP 3558563B1
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European Patent Office
Prior art keywords
rolling
strand
thin slab
hot strip
casting
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EP17826509.6A
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German (de)
English (en)
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EP3558563A1 (fr
EP3558563C0 (fr
Inventor
Bernd Linzer
Roman Winkler
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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    • 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
    • C21D8/021—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 involving particular fabrication steps or treatments of ingots or slabs
    • C21D8/0215—Rapid solidification; Thin strip 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
    • 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
    • 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
    • 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
    • B22D11/08—Accessories for starting the casting procedure
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the present invention relates to the technical field of combined casting and rolling plants.
  • plants in which a continuous casting plant for the continuous production of a steel strand in slab format, e.g. thin or medium slabs, is connected directly and inline to a rolling mill for hot rolling a hot strip.
  • the hot strip is cooled down in a cooling section after the rolling mill and then conveyed out, e.g. by winding the strip into coils .
  • these plants are also known as TSCR ( Thin Slab Casting and Rolling ) or Arvedi ESP plants.
  • the invention relates to continuously operated casting-rolling composite plants in which the casting plant is designed as a thin slab continuous casting plant ( TSER T hin S lab E ndless R olling ) .
  • the endless thin slab strand continuously produced in the thin slab continuous casting plant is fed directly, inline and uncut to the rolling mill and rolled there into an endless hot strip. After the rolling mill, the strip is cooled again in a cooling section, then cut for the first time to a certain length or a certain weight and wound into coils.
  • Two-roll strip casting plants with a downstream rolling mill are also known from the state of the art. Although a two-roll strip casting plant is very compact and produces a strip directly, this technology has not been able to prevail to date because medium to high alloy steel grades in particular cannot be reliably produced.
  • a combined casting and rolling plant for producing a steel strip is known in which a milling machine 4 for milling a thin slab strand 3 is arranged between the continuous casting machine and the hot rolling mill.
  • the mass flow of the continuous casting machine can be between 0.28 and 0.39 m 2 /min. Since the thin slab or the preliminary strip is (intermediately) heated before the final rolling, the hot rolling does not take place exclusively from the casting heat.
  • WO 2007/054237 A1 Also from the WO 2007/054237 A1 is a casting-rolling composite plant for the production of a steel strip.
  • the mass flow of the system can be 0.441 m 2 /min. Since the preliminary strip is heated before finish rolling, hot rolling is not carried out exclusively from the casting heat.
  • WO 97/36699 From the WO 97/36699 is a concept for the continuous operation of a combined casting and rolling plant.
  • the temperature of a thin slab produced in a continuous casting plant is homogenized in an equalization furnace, the thin slab is then descaled, rolled in a seven-stand rolling mill, cooled and coiled.
  • the document states that from a specific throughput h 0 *v C of h 0 *v C > 0.487 m 2 /min the hot strip can be finish-rolled from the casting heat of the thin slab in the austenitic state.
  • this concept requires very high casting speeds, e.g. a casting speed of approx. 10 m/min for a slab thickness of 50 mm.
  • the object of the invention is to overcome the disadvantages of the prior art and to provide a method for the continuous production of hot strip made of steel in a cast-rolling composite plant as well as a compact, inexpensive cast-rolling composite plant of the type mentioned at the beginning, with which high-quality hot strip of various steel grades (low, medium and high carbon, but also HSLA, API grades, etc.) can be produced cost-effectively.
  • the method should be extremely reliable and have extremely low operating costs.
  • the cast-rolling composite plant according to the invention should be significantly cheaper than comparable ESP/QSP/CSP plants.
  • a simple method for starting up a cast-rolling composite plant should be specified so that the plant can be started up quickly and reliably.
  • the object of the invention is achieved by a method for the continuous production of a coiled hot strip made of steel in a casting-rolling composite plant, wherein the casting-rolling composite plant comprises a continuous casting plant for producing a continuous thin slab strand, a rolling mill with several rolling stands for hot rolling the thin slab strand to the hot strip, a cooling section for cooling the hot strip, a shear for
  • the continuous mold mentioned is either straight or curved. However, a straight continuous mold is preferred because impurities in the molten steel can be absorbed by the casting powder, thus improving the internal quality of the thin slab strand.
  • a thin slab strand with a liquid core which has a thickness of 45 to 70 mm, preferably 55 to 65 mm, and a width of 900 to 2300 mm, preferably 1100 to 1900 mm, when it leaves the continuous mold.
  • the thin slab strand is in the,
  • the thickness reduction can advantageously be carried out when the core of the thin slab strand is liquid (so-called liquid core reduction ) or partially liquid (so-called soft core reduction ).
  • liquid core reduction liquid core reduction
  • soft core reduction partially liquid core reduction
  • the highest possible throughput through the continuous casting plant is not advantageous - as stated in the prior art - but rather an average specific throughput D of between 0.27 and 0.45 m 2 /min is aimed for. This ensures that the continuous casting plant operates reliably.
  • the continuous thin slab strand is rolled in the rolling mill without having been descaled or heated beforehand, ie exclusively from its casting heat, through at least three, particularly preferably four, rolling passes to form the hot strip with a thickness of 2.5 to 10 mm, with the last rolling pass taking place in the austenitic temperature range of the steel.
  • the hot strip therefore has an austenitic structure.
  • the hot strip is then cooled in the cooling section, cut transversely by the shears and wound into coils in the winding device.
  • a control or regulating device of the continuous casting plant uses a mathematical model to continuously calculate an actual position of a sump tip along the transport path of the thin slab strand in the strand guide and an actual temperature profile along the transport path of the thin slab strand in the strand guide and preferably in normal planes thereto, and the thin slab strand is continuously cooled in a controlled manner, taking into account a target position of the sump tip in the strand guide, so that the actual position of the sump tip of the target position as closely as possible. It is advantageous if the actual position of the sump tip is in the last third of the curved area of the strand guide or in the horizontal outlet area of the strand guide.
  • the temperature of the hot strip during the last rolling pass can be set precisely if the actual temperature T 1actual of the hot strip is measured after the last rolling pass in the rolling mill and before cooling in the cooling section and the cooling of the thin slab strand in the strand guide and/or the casting speed v C is set in a controlled manner so that the actual temperature T 1actual corresponds as closely as possible to a target temperature T 1target .
  • the winding temperature of the hot strip can be set precisely if the actual temperature T 2actual of the endless hot strip is measured after cooling in the cooling section and cooling nozzles of the cooling section are controlled in a temperature-controlled manner so that the actual temperature T 2actual corresponds as closely as possible to a target temperature T 2target .
  • a coil is subsequently pickled and cold rolled through several rolling passes in a cold rolling mill to a thickness of 0.3 to 7 mm.
  • the cold strand is fed into the continuous mold either in the direction of transport ( top feeding ) or against the direction of transport of the thin slab strand ( bottom feeding ) so that it seals the mold fluid-tight.
  • a thin slab strand is formed in the continuous mold, which is welded to the head of the cold strand.
  • the cold strand including the following thin slab strand is then pulled out of the mold and supported and guided in the strand guide.
  • the rolling stands are raised compared to the setting for rolling a hot strip with a thickness of between 2.5 and 10 mm so that the Cold strand can pass through the rolling mill unrolled.
  • the rolling stands can be opened before the start-up.
  • the cold strand is then cut off from the following thin slab strand by the shears and the cold strand is conveyed out of the roller table between the shears and the winding device or devices. This can be done particularly easily by accelerating the cold strand by driven roller table rollers and placing it on the roller table behind the winding device in the transport direction. At least the unrolled thin slab strand is then chopped into chopped material by the shears and the chopped material is conveyed out. The conveying out can take place by placing the chopped material in a scrap bucket below the roller table.
  • the rolling stands are adjusted to the thin slab strand so that the thin slab strand is rolled into a hot strip, with the hot strip then being cooled, cut crosswise and wound up.
  • the rolling mill Since the rolling mill is located immediately after the continuous casting plant, there is neither a heater nor a descaler between the end of the continuous casting plant and the first rolling stand of the rolling mill.
  • the thin slab strand thus enters the rolling mill after the continuous casting plant with a high surface and core temperature and is rolled there exclusively from its casting heat into a hot strip, with the last rolling pass taking place in the austenitic temperature range.
  • an arcuate section of the strand guide has a arc radius R of 4.5 to 6.5 m, preferably 5 to 6 m.
  • the secondary cooling has at least two spray nozzles that can be moved in a width direction of the thin slab strand at several positions within the strand guide.
  • heat insulation panels preferably a thermal tunnel
  • Encopanels or heat covers preferably a thermal tunnel
  • the horizontal distance between two rolling stands of the rolling mill is between 3 and 6 m, in particular between 4 and 5 m, and/or the length of the cooling section is between 10 and 60 m.
  • a lifting device is arranged between the shears and a pair of driving rollers, whereby the hot strip can be clamped by the driving rollers and the hot strip can be lifted by the lifting device, whereby the hot strip can be pulled away from the shears.
  • the hot strip is first cut by the shears, then the hot strip lying behind the shears in the transport direction is clamped by driving rollers and lifted by the lifting device. This pulls the hot strip away from the shears, thus preventing a collision with the following hot strip.
  • the Fig. 1 shows schematically a casting-rolling composite plant according to the invention for producing a hot-rolled hot strip made of steel.
  • the liquid steel which has been pretreated by vacuum treatment and has a hydrogen content of ⁇ 1 ppm, is fed into ladles to the ladle turret (in Fig 2 A ladle 8 suspended in the ladle turret is shown at the top left) of the continuous casting plant 1 and is poured there via a pouring distributor 9 into the continuous mold 2, which is designed as a funnel mold.
  • the continuous mold 2 a thin slab strand with a thin strand shell is formed, which has a thickness of 55 mm and a width of 1700 mm.
  • the partially solidified thin slab strand is continuously drawn out of the continuous mold 2 and supported, guided and guided in the subsequent strand guide 4 by Spray nozzles (see Fig. 4 , reference number 19) of a secondary cooling.
  • the strand guide 4 has a vertical section 4a, an arcuate section 4b with several strand guide segments, and a horizontal section 4c (see Fig. 3 ).
  • Fig 2 Two strand guide segments 6 are shown.
  • Each strand guide segment 6 has several strand guide rollers that can be hydraulically adjusted to the thin slab strand 3, whereby the thin slab strand 3 is reduced to a thickness of 45 mm.
  • the thin slab strand 3 preferably has a liquid core 5 (in a so-called liquid core reduction ) or a partially liquid core during the thickness reduction.
  • the secondary cooling in the strand guide 4 and the casting speed v C are set by a control or regulating device 20 of the continuous casting plant 1 in such a way that the thin slab strand 3 solidifies at a predetermined position within the strand guide 4 (see Fig. 3 ).
  • the reduced-thickness, solidified, non-descaled and continuous thin slab strand 3 is rolled by four rolling stands F1...F4 of the rolling mill 14 to a hot strip with a thickness of 3.2 mm (see the following table with the individual thickness reductions and average temperatures).
  • the hot strip is then cooled to winding temperature by a cooling section 16, cut by the shears 17 and wound into bundles by one of the winding devices 18.
  • the hot strip is cut off by the shears 17, the hot strip section located behind the shears 17 in the transport direction is clamped by drive rollers (e.g. a pair of drive rollers 18a of the winding devices 18) and the foot of the hot strip section is pulled away from the shears 17 by the lifting device 10.
  • the hot strip coming from the rolling mill 14 is chopped into short hot strip sections by the shears 17 and conveyed out, for example, using scrap buckets 11.
  • the Fig. 3 shows the vertical section 4a, the curved section 4b and the horizontal section 4c of the strand guide 4 of the continuous casting plant 1 in more detail. Due to the straight continuous mold 2 and the vertical section 4a, inclusions in the steel melt accumulate at the meniscus, these are absorbed by the casting powder and used in the form of casting slag for strand lubrication.
  • the radius R of the curved strand guide 4b is in Fig. 3 and is approximately 5 m in the continuous casting plant according to the invention.
  • the thin slab strand 3 enters the first rolling stand F1 of the rolling mill immediately after the horizontal section 4c (ie without being descaled).
  • the figure also shows how a thin slab strand 3 with a liquid core 5 leaves the continuous mold 2 and is reduced in thickness in the strand guide 4.
  • the reduced-thickness thin slab strand 3 is pulled out of the continuous mold 2 by an extraction device 7 designed as a pair of driven strand guide rollers.
  • the casting speed v C is set in a controlled or regulated manner by the control or regulating device 20.
  • a width-adjustable secondary cooling system is shown in the strand guide 4. Overcooling of the edge areas of the strand 3 is prevented in both narrow 3 and wide thin slab strands 3' by the two outer spray nozzles 19 being designed to be movable both in the width direction and normal to the strand surface.
  • the spray nozzles 19 are connected via spray nozzle holders 21, 21 ⁇ to a linear drive 22, which moves the spray nozzles 19 in the axial direction of the linear drive 22.
  • the middle spray nozzle 19 can be either fixed or, as shown, also movable.
  • Fig. 5 the temperature profile in °C is shown during the inventive production of a hot-rolled hot strip in a casting-rolling composite plant according to the invention; the figure corresponds to the above description and the information in Tab. 1.
  • the core temperature is shown as dotted lines, the surface temperature as dashed lines and the average temperature as solid lines.
  • a steel melt of grade DD11 is subjected to a vacuum treatment before continuous casting, whereby the hydrogen content in the liquid steel is reduced to ⁇ 1 ppm.
  • a partially solidified thin slab strand 3 with a thickness of 55 mm and a width of 1700 mm is formed and reduced in thickness by a liquid core reduction to a fully solidified thin slab strand 3 with a thickness of 45 mm.
  • the hot strip is then cooled in the cooling section 16, cut and wound into coils.
  • the Fig. 6a shows the lifting device 10 from Fig. 1 in a non-raised and in Fig. 6b in a raised state.
  • all the rollers below - including the two lifting rollers 13 - form a horizontal roller table 12.
  • the endless hot strip is cut by the shears 17, clamped and the two lifting rollers 13 are moved upwards (see the raised state in Fig. 6b ). Since the hot strip 15 is clamped at a position behind the shears 17, the foot of the hot strip section is pulled away from the shears 17. This easily prevents a collision between the pulled-away hot strip section and the hot strip coming from the rolling mill 14.
  • FIGS. 7a to 7e show schematically the process steps when starting up a casting-rolling composite plant according to the invention, whereby these process steps are not part of the invention.
  • the Fig. 7a shows the casting-rolling composite plant before the continuous casting plant starts casting.
  • the continuous mold 2 is sealed fluid-tight by a cold strand 30, which comprises a cold strand head 31 and a link chain 32.
  • the cold strand 30 by driving rollers 18a in the transport direction T from the cooled continuous mold 2.
  • the cold strand head 31 is welded to the following thin slab strand 3 (see Fig. 7b ), whereby the thin slab strand 3 is supported and guided by the strand guide 4 (usually by strand guide rollers of a strand guide segment 6) and is further cooled by secondary cooling.
  • Fig. 7b the cold strand 30 has already been largely pulled out of the continuous casting plant 1. Since the cold strand 30 is considerably colder and harder than the following thin slab strand 3, the rolling stands F1...F4 of the rolling mill 14 are in a raised state so that the cold strand 30 can pass through the rolling mill 14 unrolled. This prevents damage to the work rolls of the rolling stands F1...F4.
  • Fig. 7c the cold strand 30 has already passed the rolling mill 14 and the cooling section 16 and has been cut off from the thin slab strand 3 by the shears 17.
  • the cold strand 30 has been separated from the shears 17 by driven rollers 33 or driver rollers.
  • the cold strand 30 was deposited on a roller table 12 by driven rollers 33 behind the drive rollers 18a of the winding device 18.
  • the casting speed v C of the continuous casting plant 1 was increased and the thickness of the thin slab strand 3 was reduced by the strand guide 4, whereby a wedge-shaped wedge piece 34 is formed.
  • the unrolled thin slab strand 3 and the wedge piece 34 are chopped by the shears 17 and the chopped material is conveyed out of the roller table 12 between the shears 17 and the winding device 18, for example by pushing the chopped material in a horizontal direction transverse to the transport direction T.
  • the rolling stands F1 to F4 of the rolling mill 14 are now gradually adjusted to the reduced-thickness thin slab strand 3 and the thin slab strand 3 is rolled into a hot strip 15.
  • the figure shows the point in time at which the first rolling stand F1 is placed on the reduced-thickness thin slab strand 3.
  • the rolling stands F2 to F4 are passed through while still unrolled.
  • the plant according to the invention is significantly simpler, as it requires only a single shear 17 and does not require a descaler at all.
  • starting up the combined casting and rolling plant is significantly easier. Nevertheless, the hot strip 15 produced is excellently suited as a preliminary product for classic cold rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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Claims (13)

  1. Procédé pour la fabrication sans fin d'un feuillard à chaud bobiné (15) à partir d'acier dans une installation mixte de coulée et de laminage, dans lequel l'installation mixte de coulée et de laminage comporte
    - une installation de coulée continue (1) pour la fabrication d'un lingot en brame mince sans fin (3, 3') ;
    - un train de laminage (14) avec plusieurs cages de laminage (F1 ... F4) pour le laminage à chaud du lingot en brame mince (3, 3') en le feuillard à chaud (15) ;
    - une ligne de refroidissement (16) pour le refroidissement du feuillard à chaud (15) ;
    - une cisaille (17) pour le tronçonnage du feuillard à chaud (15) ; et
    - un dispositif d'enroulement (18) pour le bobinage du feuillard à chaud (15) ;
    comprenant les étapes suivantes :
    - coulée continue d'une masse fondue d'acier dans une lingotière (2) de l'installation de coulée continue (1) en le lingot en brame mince (3, 3'), dans lequel le lingot en brame mince (3, 3') présente à la sortie de la lingotière (2) un coeur liquide (5), une épaisseur allant de 45 à 70 mm, de préférence de 55 à 65 mm, et une largeur allant de 900 à 2 300 mm, de préférence de 1 100 à 1 900 mm ;
    - soutien, guidage et réduction de l'épaisseur du lingot en brame mince (3, 3') dans un dispositif de guidage de lingot (4) de l'installation de coulée continue (1), dans lequel le lingot en brame mince (3, 3') d'épaisseur réduite présente une épaisseur h allant de 35 à 52 mm, de préférence de 40 à 50 mm, une vitesse de coulée vC et une capacité de production spécifique D = h. vC vérifiant 0,45 m2/min ≥ D ≥ 0,27 m2/min ;
    - laminage à chaud du lingot en brame mince sans fin d'épaisseur réduite dans le train de laminage (14), dans lequel le lingot en brame mince est laminé exclusivement à partir de sa chaleur de coulée par trois à cinq, de manière particulièrement préférée par quatre, passes de laminage en le feuillard à chaud (15) avec une épaisseur allant de 2,5 à 10 mm et la dernière passe de laminage s'effectue dans la gamme de température austénitique de l'acier ;
    - refroidissement du feuillard à chaud (15) dans la ligne de refroidissement (16) ;
    - tronçonnage du feuillard à chaud (15) refroidi ; et
    - bobinage du feuillard à chaud (15) en bobines dans le dispositif d'enroulement (18).
  2. Procédé selon la revendication 1, caractérisé en ce qu'un dispositif de commande ou de régulation (20) de l'installation de coulée continue (1), à l'aide d'un modèle mathématique, calcule en continu
    - une position réelle d'une extrémité de cratère liquide le long du parcours de transport du lingot en brame mince (3, 3') dans le dispositif de guidage de lingot (4) et
    - un profil de température réelle le long du parcours de transport du lingot en brame mince (3, 3') dans le dispositif de guidage de lingot (4) et dans des plans normaux à celui-ci,
    et le lingot en brame mince (3, 3') est refroidi de manière régulée en continu avec prise en considération d'une position théorique de l'extrémité de cratère liquide dans le dispositif de guidage de lingot (4) de telle sorte que la position réelle de l'extrémité de cratère liquide corresponde autant que possible à la position théorique.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température réelle T1Ist du feuillard à chaud (15) est mesurée après la dernière passe de laminage dans le train de laminage (14) et avant le refroidissement dans la ligne de refroidissement (16), et le refroidissement du lingot en brame mince (3, 3') dans le dispositif de guidage de lingot (4) et/ou la vitesse de coulée vC sont ajustés de manière régulée de telle sorte que la température réelle T1Ist corresponde autant que possible à une température théorique T1Soll.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la réduction d'épaisseur applique une réduction douce (Soft Réduction) dans une zone avec encore du coeur liquide (5) ou du coeur partiellement liquide du lingot en brame mince (3, 3').
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température réelle T2Ist du feuillard à chaud sans fin (15) est mesurée après le refroidissement dans la ligne de refroidissement (16), et des buses de refroidissement de la ligne de refroidissement (16) sont commandées de manière régulée en température de telle sorte que la température réelle T2Ist corresponde autant que possible à une température théorique T2Soll.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une bobine est ensuite décapée et laminée à froid par plusieurs passes de laminage dans un train de laminage à froid jusqu'à une épaisseur allant de 0,3 à 7 mm.
  7. Installation mixte de coulée et de laminage pour la fabrication d'un feuillard à chaud bobiné (15) à partir d'acier, pour la mise en oeuvre du procédé selon l'une des revendications précédentes, comprenant
    - une installation de coulée continue (1), laquelle comporte
    - une lingotière (2) pour la fabrication en continu d'un lingot en brame mince (3, 3'), lequel présente à la sortie de la lingotière (2) un coeur liquide (5), une épaisseur allant de 45 à 70 mm, de préférence de 55 à 65 mm, et une largeur allant de 900 à 2 300 mm, de préférence de 1 100 à 1 900 mm ; et
    - un dispositif de guidage de lingot (4) pour le soutien, le guidage et la réduction de l'épaisseur du lingot en brame mince (3, 3') avec un dispositif de refroidissement secondaire pour le refroidissement du lingot en brame mince (3, 3'), dans laquelle le lingot en brame mince (3, 3') présente après la réduction d'épaisseur une épaisseur allant de 35 à 52 mm, de préférence de 40 à 50 mm, une vitesse de coulée vC et une capacité de production spécifique D = h. vC vérifiant 0,45 m2/min ≥ D ≥ 0,27 m2/min ;
    - un train de laminage (14) pour le laminage à chaud du lingot en brame mince (3, 3') d'épaisseur réduite, dans laquelle le train de laminage (14) disposé immédiatement après l'installation de coulée continue (1) comprend de trois à cinq, de manière particulièrement préférée exactement quatre, cages de laminage (F1 ... F4), dans laquelle, par le laminage à chaud du lingot en brame mince (3, 3') exclusivement à partir de sa chaleur de coulée, un feuillard à chaud (15) avec une épaisseur allant de 2,5 à 10 mm est produit, et la dernière passe de laminage s'effectue dans la gamme de température austénitique ;
    - une ligne de refroidissement (16) pour le refroidissement du feuillard à chaud (15) ;
    - une cisaille (17) pour le tronçonnage du feuillard à chaud (15) refroidi ; et
    - un dispositif d'enroulement (18) pour le bobinage du feuillard à chaud (15) en bobines.
  8. Installation mixte de coulée et de laminage selon la revendication 7, caractérisée en ce que l'installation de coulée continue (1) comporte un dispositif de commande ou de régulation (20) et un modèle mathématique pour le calcul en continu
    - d'une position réelle d'une extrémité de cratère liquide le long du parcours de transport du lingot en brame mince (3, 3') dans le dispositif de guidage de lingot (4) et
    - d'un profil de température réelle le long du parcours de transport du lingot en brame mince (3, 3') dans le dispositif de guidage de lingot (4) et dans des plans normaux à celui-ci,
    dans laquelle le dispositif de commande ou de régulation (20) ajuste de manière régulée au moins une grandeur dans le groupe d'une intensité de refroidissement dans le dispositif de refroidissement secondaire et de la vitesse de coulée vC avec prise en considération d'une position théorique d'une extrémité de cratère liquide dans le dispositif de guidage de lingot de telle sorte que la position réelle de l'extrémité de cratère liquide du lingot en brame mince (3, 3') corresponde autant que possible à la position théorique.
  9. Installation mixte de coulée et de laminage selon la revendication 7 ou la revendication 8, caractérisée en ce qu'une section en forme d'arc (4b) du dispositif de guidage de lingot (4) présente un rayon de courbure R allant de 4,5 à 6,5 m, de préférence de 5 à 6 m.
  10. Installation mixte de coulée et de laminage selon l'une des revendications 7 à 9, caractérisée en ce que des panneaux d'isolation thermique, de préférence un tunnel thermique, sont montés dans la zone comprise entre l'extrémité d'une section horizontale (4c) du dispositif de guidage de lingot (4) et la première cage (F1) du train de laminage (14).
  11. Installation mixte de coulée et de laminage selon l'une des revendications 7 à 10, caractérisée en ce que la distance horizontale entre deux cages de laminage (F1, F2, F3, F4) du train de laminage (14) est comprise entre 3 et 6 m, en particulier entre 4 et 5 m.
  12. Installation mixte de coulée et de laminage selon l'une des revendications 7 à 11, caractérisée en ce que la longueur de la ligne de refroidissement (16) est comprise entre 10 et 60 m.
  13. Installation mixte de coulée et de laminage selon l'une des revendications 7 à 12, caractérisée en ce qu'un dispositif de levage (10) est disposé entre la cisaille (17) et une paire de rouleaux d'entraînement (18a), dans laquelle le feuillard à chaud (15) peut être pincé par les rouleaux d'entraînement (18a) et le feuillard à chaud (15) peut être soulevé par le dispositif de levage (10), moyennant quoi le feuillard à chaud (15) peut être éloigné de la cisaille (17).
EP17826509.6A 2016-12-22 2017-12-21 Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, et installation combinee de coulee et de laminage Active EP3558563B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP16206350 2016-12-22
EP17154807.6A EP3338914A1 (fr) 2016-12-22 2017-02-06 Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, procede de demarrage d'une installation combinee de coulee et de laminage et installation combinee de coulee et de laminage
PCT/EP2017/084162 WO2018115324A1 (fr) 2016-12-22 2017-12-21 Procédé servant à fabriquer en continu un feuillard à chaud enroulé dans une installation mixte de coulée-laminage, procédé servant à démarrer une installation mixte de coulée-laminage et installation mixte de coulée-laminage

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EP3558563A1 EP3558563A1 (fr) 2019-10-30
EP3558563B1 true EP3558563B1 (fr) 2024-08-21
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EP17826509.6A Active EP3558563B1 (fr) 2016-12-22 2017-12-21 Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, et installation combinee de coulee et de laminage

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EP3769862A1 (fr) * 2019-07-24 2021-01-27 Primetals Technologies Austria GmbH Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue
CN111570517B (zh) * 2020-04-15 2022-03-08 武汉钢铁有限公司 一种薄板坯连铸连轧生产热成型钢的卷取控制方法
DE102021211339A1 (de) * 2020-10-13 2022-04-14 Sms Group Gmbh Vorrichtung und Verfahren zur Herstellung von warmgewalzten Metallbändern
CN112276029A (zh) * 2020-11-05 2021-01-29 中冶京诚工程技术有限公司 圆坯连铸系统及连铸方法
CN113664038B (zh) * 2021-08-19 2023-06-27 中冶赛迪装备有限公司 热轧板带连轧机短流程布置结构
CN115415489B (zh) * 2022-09-05 2024-02-13 东北大学 一种铝/铝合金薄板坯连铸装备及工艺
AT528176A1 (de) * 2024-03-05 2025-10-15 Primetals Technologies Austria GmbH Giesswalzverbundanlage mit verbesserter produktivität
EP4624065A1 (fr) 2024-03-28 2025-10-01 Primetals Technologies Austria GmbH Séparation de brins métalliques dépendant de la situation

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CN110087801A (zh) 2019-08-02
WO2018115324A1 (fr) 2018-06-28
RU2019121897A3 (fr) 2021-02-17
RU2019121897A (ru) 2021-01-22
EP3338914A1 (fr) 2018-06-27
RU2750305C2 (ru) 2021-06-25
EP3558563A1 (fr) 2019-10-30
EP3558563C0 (fr) 2024-08-21
CN110087801B (zh) 2021-06-25

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