EP1453626A2 - Poche de coulee pour produire une barre metallique de grande purete - Google Patents

Poche de coulee pour produire une barre metallique de grande purete

Info

Publication number
EP1453626A2
EP1453626A2 EP02792874A EP02792874A EP1453626A2 EP 1453626 A2 EP1453626 A2 EP 1453626A2 EP 02792874 A EP02792874 A EP 02792874A EP 02792874 A EP02792874 A EP 02792874A EP 1453626 A2 EP1453626 A2 EP 1453626A2
Authority
EP
European Patent Office
Prior art keywords
intermediate vessel
melt
interior
metal
vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02792874A
Other languages
German (de)
English (en)
Other versions
EP1453626B1 (fr
Inventor
Markus Brummayer
Gerald Eckerstorfer
Gerald Hohenbichler
Heinz Hödl
Karl Mörwald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3689455&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1453626(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Priority to AT02792874T priority Critical patent/ATE318194T1/de
Priority to SI200230319T priority patent/SI1453626T1/sl
Publication of EP1453626A2 publication Critical patent/EP1453626A2/fr
Application granted granted Critical
Publication of EP1453626B1 publication Critical patent/EP1453626B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/147—Multi-strand plants
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring

Definitions

  • the invention relates to an intermediate vessel with a refractory lining for the production and transfer of molten metal of high purity from a ladle into the mold of a continuous caster, and to a method for producing a high purity metal strand with a continuous caster.
  • an intermediate vessel is usually used between the ladle and the continuous casting mold in order to compensate for fluctuations in the melt feed and in the rate at which the metal strand is withdrawn from the continuous casting plant.
  • the transfer of the melt from the tundish into the mold of a continuous casting plant usually takes place through a drain opening in the tundish base, to which a controllable closure element, such as a slide or a stopper, is assigned, and furthermore through a dip tube or a pouring nozzle.
  • the mold can be of various types, for example an oscillating tubular or plate mold, a mold formed by a single casting roll or by two co-operating casting rolls and side plates, or a mold formed by rotating belts or caterpillars.
  • this intermediate vessel is designed as a distributor vessel and supplies several continuous casting molds arranged next to one another via a plurality of melt outlets.
  • V-shaped distribution vessels are known for double-strand casting systems.
  • the tundish usually also serves to calm the molten metal flowing in from the ladle and is intended to enable the separation of slag particles and other non-metallic inclusions during the dwell time of the molten metal in the tundish.
  • the flow behavior of the molten metal is often also due to flow-conducting fittings in the Target vessel influenced.
  • Such trough-shaped intermediate vessels are already known, for example, from EP-B 804 306 and EP-A 376 523.
  • liquid steel is introduced from the ladle via a shadow pipe into a distributor or tundish.
  • the induced steel jet flows in the direction of the tundish floor and meets the flat bottom of the tundish or a device for flow deflection, which deflects the liquid jet in the direction of the surface of the bath surface and draws kinetic energy through dissipation.
  • the flow usually comes back to the surface of the bath level, migrates along it and dives along the narrow rear wall and along the side walls of the trough-shaped intermediate vessel.
  • this essentially induces two counter-rotating recirculation rollers (upward flow in a longitudinal center section) which migrate in the direction of the outlet opening.
  • the steel temperature drops due to heat loss via the side walls and the surface of the bath level in the direction of the outlet opening, the temperature loss between the supply and outlet points being dependent on the throughput.
  • the foreign matter to be separated out as efficiently as possible in the molten metal comes on the one hand from the steel production process and is flushed out of the ladle into the tundish when the molten metal is transferred.
  • even foreign substances are introduced into the molten metal in the intermediate vessel. These originate from the refractory lining material of the tundish or from the mostly used liquid steel covering slag and are removed and washed in by mechanical erosion due to wall shear stresses or by chemical erosion due to reoxidation processes.
  • slag inclusions result from resuspension due to high bath mirror speeds and increased surface turbulence.
  • an intermediate vessel according to the invention with a refractory lining in that a bricked interior of the intermediate vessel, depending on an operating bath level height (h), fulfills the condition that a dimensionless ratio (K) of the bricked surface wetted by the molten metal (Ar ef ) to the filling volume (V) bounded by this bricked-up surface and the free surface (A Top ) dependent on the bath level,
  • These values for the dimensionless ratio K are preferably between 3.83 and 4.2.
  • the dimensionless ratio K which defines a volumetric degree of wetting, shows that the contact area between the lining and
  • Molten metal in relation to the amount of molten metal available in the intermediate vessel should be kept as small as possible. At the same time, however, it should not be neglected that an appropriate one for maximum particle separation
  • a high particle separation occurs if, in addition, the bricked interior of the tundish, depending on the operating bath level (h), meets the condition that the ratio ( ⁇ ) of the free surface (A Top ) to the bricked surface wetted by the molten metal (Ar ef ) is between 0.45 and 1.0.
  • the dimensionless ratio ⁇ which puts the free surface, which acts as a particle separation surface, in relation to the wetted brick surface, which as Particle generation surface acts, shows that in the preferred area there is a balance in the opposing effects.
  • a favorable particle separation rate is achieved with a ratio ⁇ between 0.5 and 0.8.
  • the K and ⁇ values determined above do not take into account any additional intermediate vessel internals such as flow deflectors, weirs etc.
  • the operating bath level is between 0.5 m and 1.5 m.
  • the requirement for high particle separation from the molten metal in the tundish is reliably guaranteed during sequence casting, even during the phase of the ladle change, if the filling volume of the interior of the tundish contains at least 5 times, preferably at least 7 times, the amount of molten metal that occurs in regular operation per minute is shed.
  • the filling volume of the interior of the intermediate vessel is at least 0.75 m 3 , but preferably at least 1.0 m 3 .
  • the filling volume of the interior of the intermediate vessel is at least 0.75 m 3 , but preferably at least 1.0 m 3 .
  • a maximum particle deposition rate which implies the largest possible deposition surface or bath surface
  • Preferred shapes of the intermediate vessel result if the bricked-up interior of the intermediate vessel is essentially formed by a generator rotating about a vertical vessel axis. This creates rotationally symmetrical vessel interiors.
  • the optimal shape which has a maximum surface for separating inclusions in the bath-covering slag for a given intermediate vessel volume and at the same time forms a minimal contact surface for mechanical and chemical erosion, wetted with molten metal, is formed by a hemisphere or a hemisphere segment.
  • a generally valid relationship can be specified for the theoretically ideal area ratio of bath surface to wetted refractory lining:
  • h is the operating bath level height and R is the bath level radius.
  • the bricked interior of the intermediate vessel is essentially formed by a generator rotating about a vertical vessel axis with an alternating, preferably harmoniously pulsating distance (r) from the vertical vessel axis.
  • This allows elliptical cross sections normal to the vertical vessel axis, but also cross sections with any other outer contour, for example a square cross section with large fillet radii or polygonal cross sections.
  • Favorable shapes for the tundish result if the tundish has a hemispherical, frustoconical, paraboloidal or cylindrical interior, at least in sections, and the cross section of the tundish interior is at least partially circular or elliptical in a section plane normal to the vertical axis of the vessel.
  • a dip tube protruding into the intermediate vessel is provided for the melt supply, a flow guide on the intermediate vessel bottom below the dip tube and the outlet opening at a point on the intermediate vessel bottom that is spaced from the flow guide and at least half the bottom diameter arranged.
  • the intermediate vessel comprises a melt feed basin and at least one melt discharge basin, each melt discharge basin is separated from the melt supply basin by a transport channel, preferably an overflow, and each melt discharge basin delimits an interior of the intermediate vessel.
  • This type of intermediate vessel in which the melt flows through two successively arranged basins, not only separates the area of the melt supply from the ladle from the area of the melt discharge into the mold, but also structurally and thus enables an additional continuity in the flow behavior.
  • the connection area between the melt supply basin and the melt discharge basin can be established by an overflow or by a transport channel, which can also be arranged below the bath level.
  • the geometric conditions for the design of the interior described above must at least be met by the melt drainage basin.
  • a contribution to reducing the amount of foreign matter from the lining of the tundish is also made if the melt supply basin delimits an interior of the tundish and fulfills the conditions of the dimensionless ratio (K) and possibly also the dimensionless ratio ( ⁇ ).
  • K dimensionless ratio
  • ⁇ dimensionless ratio
  • the melt feed basin is a Flow guide and the melt discharge basin are assigned at least one outlet opening.
  • the tundish is supported on a distributor carriage which preferably has lifting and / or tipping devices and has a travel drive and on a roadway between an operating position and a Waiting position is designed to be movable.
  • a melt volume (V. ) of a metal melt contained in the bricked-up interior of the tundish as a function of the respective operating bath level (h) is set such that a dimensionless ratio () of the contact surface (A ref ) formed by the metal melt to the contact surface formed by the metal melt (A ref ) and the bath surface dependent free surface
  • a high degree of purity of the melt for the subsequent casting process is achieved if, in addition, a melt volume (V) of the metal melt contained in the interior is adjusted so that the ratio ( ⁇ ) of the free surface (A Top ) formed by the metal melt to that formed by the metal melt Contact surface (A ref ) is between 0.45 and 1.0, preferably between 0.5 and 0.8.
  • the operating bath level is set to a value between 0.5 m and 1.5 m.
  • the melt volume which is located in the interior of the intermediate vessel, is set to at least 0.75 m 3 , preferably at least 1.0 m 3 .
  • the requirements for high particle separation in sequence casting are also guaranteed during the ladle change, if the melt volume is set to at least 5 times, preferably at least 7 times, the amount of metal melt that is poured per minute in normal operation.
  • the molten metal essentially occupies an interior formed by a generator rotating about a vertical vessel axis.
  • the molten metal can also occupy an interior space formed by a generator rotating about a vertical vessel axis with an alternating, preferably harmonically pulsating distance (r) from the vertical vessel axis.
  • the melt is fed in below the metal bath level so as not to disturb the slag-covered separation surface and is directed to the melt outlet.
  • the tundish according to the invention can also be operated in short-circuit operation, which in particular minimizes the entry of harmful particles from the tundish lining.
  • Short-circuit operation is to be understood as a procedure in which the molten metal flowing from the ladle into the tundish or the interior of an tundish flows through it in a short way and flows out through the outlet opening of the tundish or the interior of the tundish. This results in a flow pattern in this interior in which a large proportion of the incoming molten metal is not subject to any circulating flows in the intermediate vessel, but only experiences minor flow deflections on the largely direct path from the melt inlet to the melt outlet. In the method described, this is achieved in that the horizontal distance between the metal melt jet entering the melt volume essentially vertically and the metal melt jet emerging essentially vertically from the melt volume is set to less than half the bottom diameter of the interior.
  • FIGS. 2a, 2b the tundish according to the invention in plan and elevation according to a first embodiment
  • FIG 4a, 4b the intermediate vessel according to the invention for a two-strand casting installation in plan and elevation
  • FIG. 1 schematically shows the arrangement of an intermediate vessel 1 according to the invention in its operating position between a ladle 2 and a mold 3 in a continuous casting installation, which is indicated by the mold 3 and the cast strand 13 discharged from it.
  • the ladle 2 is placed in fork arms 4 of a ladle turret, which is indicated by the vertical turret axis 5.
  • an immersion pouring tube 6 which connects to the outlet opening 7 of the ladle 2 and projects into the tundish 1
  • molten metal flows from the ladle 2 into the tundish 1 and exits there below the bath level 8. From here, the molten metal is passed through an outlet opening 9 and a further immersion pouring tube 10 into the mold 3 and exits there below the mold bath level 11.
  • the melt flow in the immersion pouring tube 10 is regulated by a controllable closure element 12, for example a slide.
  • a controllable closure element 12 for example a slide.
  • the molten metal solidifies to form a cast strand 13, which is continuously conveyed out in a roller guide (not shown) of a continuous casting plant.
  • the intermediate vessel 1 as shown in FIGS. 2a and 2b, consists of a steel trough 15, which forms an outer stable vessel frame, and a refractory lining 16 as an insulation layer, the inner surface of which forms the contact surface with the molten metal 17 and forms the interior 14 of the intermediate vessel.
  • the intermediate vessel wall 19 projects upwards in a rotationally symmetrical manner around a vertical vessel axis 20 and forms a spherical segment-shaped inner space 14.
  • the inner space 14, viewed geometrically, is formed by a generator E rotating about the vertical vessel axis 20 at a constant distance r.
  • a filling volume (V) is filled by the molten metal 17 in the interior 14 of the intermediate vessel 1, the free surface (A Top ) of the molten metal forming the bath level 8, which is located at the operating bath level (h) and is covered by a layer of slag 22 into which foreign particles are continuously separated from the molten metal.
  • a partial area of the surface of the refractory lining 16 is wetted by molten metal 17 and this wetted brick surface (A ref ) is exposed to particularly high thermal loads and chemical and mechanical erosion. Particles are continuously flushed out of the lining 16 into the molten metal 17 and released to the slag layer 22 again with the melt flow at the transition to the latter.
  • 3a and 3b show a further embodiment of a possible intermediate vessel, in which each cross-sectional area normal to the vertical vessel axis 20, as can be seen in the plan, is formed by an ellipse.
  • the inner contour results geometrically from the rotation of a generatrix (E) about the vertical vessel axis 20, the radius distance (r) of the generatrix varying from the vertical vessel axis as a function of the angle of rotation ( ⁇ ).
  • the flow guide 21 and the outlet opening 9 are as far apart from one another as possible in order to create favorable flow conditions in the interior 14 and to ensure a high particle separation rate.
  • the intermediate vessel can also be formed by a plurality of receiving basins for molten metal.
  • 4a and 4b show in plan and elevation an intermediate vessel or distributor vessel for a two-strand casting installation, the two pouring veins 23 being indicated by dashed lines.
  • the intermediate vessel is formed in a V-shape by three contiguous receiving basins.
  • a melt feed basin 25 is arranged centrally and connected to two melt drain basins 26 to form a structural unit.
  • a flow guide 21 is embedded in the bottom of the refractory lining.
  • the intermediate vessel analogously to that shown in FIG. 1, is positioned during operation so that the immersion spout 6 of the ladle 2 lies exactly above the flow guide 21.
  • Each melt discharge basin 26 is penetrated at the bottom of the vessel by an outlet opening 9 which is positioned above the mold 3 in the casting operation.
  • the immersion pouring tube 10 adjoining the outlet opening 9 projects into the mold cavity of the mold 3.
  • the vertical section through the intermediate vessel along the line AB shows an overflow 27 formed by a refractory lining between the melt supply basin 25 and the melt discharge basin 26.
  • the bath level 8 of the molten metal 17 protrudes above the overflow 27, so that the molten metal, which has calmed down in the melt feed basin 25, can flow in a slow flow into the melt discharge basin 26 and further particle separation can take place there before the molten metal flows through the outlet opening 9 into the continuous casting mold 3 , Both the melt supply basin 25 and the two melt discharge basins 26 form a spherical segment-shaped interior 14.
  • the intermediate vessel according to the invention is height-adjustable on a distribution trolley 30 by means of lifting and / or tilting devices 31 and, if necessary, also tiltably supported and between an operating position in which the immersion casting tube protrudes into the mold, and a maintenance position, in which the intermediate vessel is heated and prepared for its use, can usually be moved on a track 32 in a rail-bound manner (FIG. 5).
  • the distribution car 30 is equipped with a travel drive 33.
  • the intermediate vessel is usually closed with a lid in order to largely avoid cooling of the melt by heat radiation. If necessary, additional installations in the tundish are possible, which have a favorable influence on the melt flow.
  • the metal melt can also be passed between the adjacent melt basins below the bath level of the filled melts through one or more tubular transport channels, with the advantage that the slag layer is only subject to a very slight flow movement.
  • Fig. 6 the short-circuit operation already described above is clearly shown on the tundish.
  • the molten metal flows through the immersion pouring tube 6 of the ladle into the interior 14 and flows over a short distance, which is indicated by flow lines 35, to the outlet opening 9 and leaves the intermediate vessel there again.
  • the horizontal distance H between the metal melt entering the interior 14 in the vertical direction and also emerging again from the interior 14 in the vertical direction is less than half the diameter d of the intermediate vessel bottom 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Afin d'obtenir, dans un panier de coulée, un taux de séparation des particules étrangères le plus élevé possible, avec une production minimale d'inclusions, l'espace intérieur cloisonné du panier de coulée (1) remplit, en fonction d'une hauteur (h) de niveau de bain de fonctionnement, la condition qu'un rapport sans dimension (λ) de la surface cloisonnée (Aref) sur le volume de remplissage (V) défini par cette surface cloisonnée et par la surface libre (ATop) dépendant de la hauteur du niveau de bain, sachant que formule (I), s'élève entre 3,83 et 4,39.
EP02792874A 2001-12-14 2002-12-04 Poche de coulee pour produire une barre metallique de grande purete Revoked EP1453626B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT02792874T ATE318194T1 (de) 2001-12-14 2002-12-04 Zwischengefäss zur herstellung eines metallstranges hoher reinheit
SI200230319T SI1453626T1 (sl) 2001-12-14 2002-12-04 Vmesna posoda za izdelavo kovinske gredice vecje cistoce

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0196101A AT411024B (de) 2001-12-14 2001-12-14 Zwischengefäss und verfahren zur herstellung eines metallstranges hoher reinheit
AT19612001 2001-12-14
PCT/EP2002/013687 WO2003051560A2 (fr) 2001-12-14 2002-12-04 Panier de coulee et procede pour produire une barre metallique de grande purete

Publications (2)

Publication Number Publication Date
EP1453626A2 true EP1453626A2 (fr) 2004-09-08
EP1453626B1 EP1453626B1 (fr) 2006-02-22

Family

ID=3689455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792874A Revoked EP1453626B1 (fr) 2001-12-14 2002-12-04 Poche de coulee pour produire une barre metallique de grande purete

Country Status (15)

Country Link
US (1) US7108048B2 (fr)
EP (1) EP1453626B1 (fr)
JP (1) JP2005511321A (fr)
KR (1) KR101003940B1 (fr)
CN (1) CN1273247C (fr)
AT (1) AT411024B (fr)
AU (1) AU2002358590B2 (fr)
BR (1) BR0214948A (fr)
CA (1) CA2470022A1 (fr)
DE (1) DE50205885D1 (fr)
MX (1) MXPA04005703A (fr)
PL (1) PL370528A1 (fr)
RU (1) RU2004121465A (fr)
WO (1) WO2003051560A2 (fr)
ZA (1) ZA200404536B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20031356A1 (it) * 2003-07-02 2005-01-03 Danieli Off Mecc Dispositivo di alimentazione di metallo fuso in cristallizzatore.
AT413084B (de) 2003-12-02 2005-11-15 Voest Alpine Ind Anlagen Sequenzgiessverfahren zur herstellung eines gegossenen metallstranges hoher reinheit
DE102014119109B4 (de) * 2014-12-18 2018-12-13 Voestalpine Stahl Gmbh Verteiler für Stranggießanlagen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333746A (en) * 1966-05-19 1967-08-01 Harbison Walker Refractories Tundish ladles
JPS57115949A (en) * 1981-01-05 1982-07-19 Nippon Steel Corp Production of clean steel in continuous casting
IT1214396B (it) * 1984-05-08 1990-01-18 Centro Speriment Metallurg Paniera di colata continua con funzioni di reattore per trattamenti fuori forno
US4715586A (en) 1987-02-18 1987-12-29 Bethlehem Steel Corporation Continuous caster tundish having wall dams
US4995592A (en) * 1988-12-22 1991-02-26 Foseco International Limited Purifying molten metal
EP1273370A2 (fr) * 1991-03-27 2003-01-08 Kawasaki Steel Corporation Appareil pour eliminer des inclusions non métalliques dans du métal en fusion
US5551672A (en) * 1995-01-13 1996-09-03 Bethlehem Steel Corporation Apparatus for controlling molten metal flow in a tundish to enhance inclusion float out from a molten metal bath
FI108852B (fi) * 2000-02-18 2002-04-15 Timo Jorma Juhani Lohikoski Jatkuvatoiminen menetelmä epäpuhtausaineen poistamiseksi

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03051560A2 *

Also Published As

Publication number Publication date
US20050067134A1 (en) 2005-03-31
ATA19612001A (de) 2003-02-15
RU2004121465A (ru) 2006-01-10
KR101003940B1 (ko) 2010-12-30
JP2005511321A (ja) 2005-04-28
EP1453626B1 (fr) 2006-02-22
PL370528A1 (en) 2005-05-30
AU2002358590A1 (en) 2003-06-30
AT411024B (de) 2003-09-25
WO2003051560A3 (fr) 2004-01-29
KR20040063173A (ko) 2004-07-12
WO2003051560A2 (fr) 2003-06-26
ZA200404536B (en) 2005-07-04
CA2470022A1 (fr) 2003-06-26
BR0214948A (pt) 2004-11-30
CN1273247C (zh) 2006-09-06
DE50205885D1 (de) 2006-04-27
AU2002358590B2 (en) 2007-05-31
US7108048B2 (en) 2006-09-19
MXPA04005703A (es) 2004-12-06
CN1604828A (zh) 2005-04-06

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