EP1677928B1 - Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee - Google Patents

Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee Download PDF

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Publication number
EP1677928B1
EP1677928B1 EP04805290A EP04805290A EP1677928B1 EP 1677928 B1 EP1677928 B1 EP 1677928B1 EP 04805290 A EP04805290 A EP 04805290A EP 04805290 A EP04805290 A EP 04805290A EP 1677928 B1 EP1677928 B1 EP 1677928B1
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EP
European Patent Office
Prior art keywords
metal
cast product
mould
jets
casting
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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.)
Expired - Lifetime
Application number
EP04805290A
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German (de)
English (en)
French (fr)
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EP1677928A1 (fr
Inventor
Siebo Kunstreich
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Rotelec SA
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Rotelec SA
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Publication of EP1677928A1 publication Critical patent/EP1677928A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects
    • 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
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to the continuous casting of metals, especially steel. It relates more particularly to the electromagnetic stirring of products with an elongate cross-section during casting, and even more specifically the establishment, within the still-in-liquid portion of the cast metal, of a particular distribution of the flows in the casting. magnetic fields applied.
  • MHD Magneto-HydroDynamic
  • the movements printed to the molten metal during the continuous casting can schematically be classified into two distinct categories, depending on whether one considers the mold or, below, the stages of the secondary cooling of the casting machine.
  • loops 42, 43 are established parallel to the large faces and are arranged according to the height of the product cast on either side of a common transverse driving action zone of the magnetic field, the currents of each loop going up along a small face and descending along the small opposite face.
  • Such a movement pattern is conventionally referred to as a "butterfly wing configuration".
  • the other, 22, is reflected upwardly so as to bring to the vicinity of the free surface 23 of the ingot mold metal the enthalpy required to avoid freezing phenomena of the cast metal at the meniscus, which are often the cause accidental stops of the casting. It is thus intended to produce in the mold a circulation mode called "double loop", as opposed to the "single loop” mode.
  • the latter represented in FIG. 7, first results in a phenomenon of rise of the metal towards the meniscus as soon as it leaves the openings of the nozzle, very often resulting from an injection of argon of anti-capping in the nozzle from the tundish located above. This immediate upward rise then continues by a surface current to each small face and a descent along it. In this way, a cartography of the speeds generally directed downwards in the extraction direction of the product is established relatively quickly in the mold, with the absence of the upper loop 22 for supplying "hot" metal to the meniscus.
  • the "double loop” mode is acquired durably during casting only if the casting conditions are suitable (casting speed, slab width, depth of immersion of the casting nozzle, argon flow anti-capping, etc ). Random transitions in "single-loop” mode may occur during casting even if these conditions fluctuate, which is in fact the general case.
  • the present invention is precisely to overcome such a handicap.
  • the invention aims, by means of a studied overall stirring movement of the molten metal according to the metallurgical height, to provide a good exchange of the metal still liquid in both directions between the zone of the secondary cooling and the mold.
  • both thermal and chemical homogeneity between the top and the bottom of the poured liquid metal well will be achieved without disturbing the flow mode in the mold and, if necessary, without depriving itself of the cumulative beneficial effects thereof. mixing in the mold and stirring in the secondary cooling respectively.
  • An additional object of the invention is to contribute to the improvement of the metallurgical quality of steel grades which are in search of good internal health, such as grades for heavy plate or for large welded tubes, ferritic stainless steels, or electrical silicon steels.
  • Another complementary aim is to be able to act on the flows in the secondary to use them at the pouring jets from the nozzle either as an accelerating agent or, on the contrary, as a braking agent for the metal arriving in the mold, or else as a means of counteracting the "left-right" asymmetry of movements of the metal within the mold.
  • the subject of the invention is an electromagnetic stirring process in the zone of secondary cooling of a continuous casting plant for slabs, or other similar products with an elongate cross-section, the mold of which is provided with a submerged casting nozzle with lateral outlet openings directed towards the small faces, brewing method implemented using sliding magnetic fields generated by polyphase inductors arranged close to the cast metal, characterized in that one forces, in said zone of the secondary cooling, the establishment of a longitudinal flow of the liquid metal located in the median region of the cast product according to two collinear currents antagonists.
  • these two longitudinal antagonistic collinear currents are created in the middle part of the product which move away from each other, so that the two upper lobes which extend in the mold to the level of the jets from the outlets of the outlet of the casting nozzle merge with them in co-current to strengthen them.
  • these two longitudinal antagonistic collinear currents are created in the middle part of the product which converge towards one another so that the two upper lobes which extend in the mold to the level of the jets coming from the Outlets of the casting nozzle are superimposed on them against the current to slow them down.
  • the location of the longitudinal flow in the secondary towards the one or the other of the small walls of the cast product is shifted laterally in order to counter the tendencies to the "left-right" asymmetry of the movements. metal within the mold.
  • the longitudinal metal flow is created in the median region of the cast product in two collinear currents antagonistic using collinear movable magnetic fields sliding longitudinally in said middle region, or approaching one on the other, either by going away.
  • the longitudinal metal flow is created in the median region of the cast product in two collinear currents antagonist using collinear moving magnetic fields sliding transversely along the width of the cast product, or by approaching the one from the other from the edge to the center of the cast product, either moving away from each other from the center towards the edge of the cast product.
  • the sliding magnetic fields are generated using polyphase linear inductors that are available opposite the large faces of the cast product.
  • the inductors are supplied with electric currents of different intensities, in order to regulate differently the action on the two antagonistic collinear metal currents created by the sliding magnetic fields they generate.
  • the invention consists, in its main foundations, to create in the secondary cooling zone a stirring cross with two transverse branches and two longitudinal branches.
  • the transverse branches (or horizontal if one assumes the vertical axis of casting) develop according to the width of the cast product and the two longitudinal (or vertical) branches develop in the median (most often axial) region of the cast product .
  • FIGS. 1 to 4 served to support the presentation of the prior art already made at the beginning of this memoir. We will not come back to this in the following.
  • FIGS. 5 to 9 representative of the mode of mixing in the secondary of the invention in these two variants (divergent or convergent in the center), the sliding magnetic fields, just like the linear inductors which produce them, are represented by vertical or horizontal arrows thick.
  • the convection movements produced are represented by their main trajectories in the form of arrows carrying arrowheads indicating the direction of movement of the movement on the carrier trajectory.
  • the solid lines represent active convection zones, therefore of circulations subjected to the action of sliding magnetic fields.
  • the discontinuous lines represent the zones of passive convection, otherwise called recirculation zones, which are necessarily complementary to the previous ones to ensure the closure of the movements.
  • a submerged nozzle 4 centered on the casting axis A feeds the molten metal mold from a not shown distributor above.
  • This nozzle is provided with lateral outlet openings 5 and 5 'each facing each other of the small walls 3 and 3' respectively.
  • the format of the cast product is determined by the internal dimensions of the ingot mold defining the casting space in which the molten metal arrives in the form of jets 7, 7 'coming out of the openings of the nozzle 4 conventionally in a more or less average direction. horizontal, or slightly inclined downward.
  • the cast product thus progresses from the top, from the meniscus level 8, downwards, in the direction of extraction of the casting machine, vertically or along a curved path in a plane orthogonal to that of the figure, with an extraction speed (casting speed) usually of the order of one meter per minute.
  • an extraction speed usually of the order of one meter per minute.
  • it progressively solidifies from its periphery to the center by extraction of its internal heat, first in mold 1 in contact with the cooled copper walls, then in the zone of secondary cooling 2 under the effect watering ramps.
  • the metallurgical height (or depth of the solidification well) is conventionally defined as the difference in dimensions on the vertical between the level of the free surface of the molded metal (or meniscus) and that of the bottom of the solidification well. at the bottom of the secondary cooling zone, where the finishing solidification fronts which develop on each of the large faces of the cast product meet as the solidification progresses.
  • This cross 9 is a cross with four branches, collinear two by two: two longitudinal branches (here vertical) 10a, 10b, forming a pair aligned on the casting axis A, and two transverse branches (here horizontal) 11a, 11b forming a pair developing according to the width of the cast product.
  • the liquid metal flows in opposite directions two by two.
  • the circulation of the metal in one pair is the opposite of that of the other pair.
  • these branches are connected in some way to each other by recirculation loops to form an overall flow developing in the plane of the large faces of the product.
  • the leaves constituting lobes L1, L2, L3, L4, the two upper ones, L1 and L4, extending to the mold at the outlet jets 7 and 7 '.
  • the pair of vertical branches is in "divergent" type convection.
  • the metal currents move away from each other from the center P.
  • One, 10a deflects towards the mold 1 above
  • the other, 10b deflects downwards, in the direction of extraction of the poured product, towards the closing point of the solidification well.
  • the convection of the metal is then of the "convergent” type: the metal currents confluence towards each other towards the confluence center P by flowing the small lateral faces of the product towards the axis longitudinal A.
  • the metal currents forming these branches are created by sliding magnetic fields, themselves generated by linear inductors arranged in close proximity to the cast product facing these large faces (preferably both sides).
  • the two pairs of branches are simultaneously activated by the magnetic fields. Only one can be, for example the vertical branches 10a, 10b, the other, 11a, 11b, then naturally becoming the seat of a recirculation reaction, because the center P functions as a current passage node that keeps mass flow rates and momentum, and vice versa.
  • the implementation of the invention maximizes the exchange of metallic material between the bottom and the top of the liquid well.
  • the loop circulation of the metal in any lobe takes place in a direction of rotation opposite to that which is established in the two nearest nearest lobes.
  • the force of the casting jets 7 and 7 ' is then systematically reinforced by the central flow 10a back to co-current, recycle loops L5 and L6 in the mold to the meniscus 8 will be strengthened in turn. Therefore, the "double loop" mode L5, L1, L4 and L6 present within the mold is thus furthermore stabilized.
  • the branches 10 and 11 of the stirring cross 9 are generated by the action applied to these places of sliding magnetic fields.
  • the lines of force of these are orthogonal to the surface of the cast product, or at least have an orthogonal main component to maximize the electromagnetic coupling with the liquid metal.
  • FIG. 7a illustrates a first implementation of the invention according to which two identical linear inductors 12 and 13 are placed horizontally at the same height level on the casting machine (collinear inductors) on either side of the axis of rotation. casting and mounted in opposition so as to create collinear magnetic fields sliding transversely along the width of the cast product, small faces 18, 18 'towards the center.
  • These inductors are advantageously dimensioned so as to each generate a sliding magnetic field, along an active convection branch (11a or 11b), of length equal to slightly less than half of the half width of the cast slab 6.
  • the driving force of stirring is given by the convergent transverse branches 11a, 11b of the stirring cross, and the longitudinal flow streams 10a, 10b, are then obtained after passage of the confluence point P.
  • Figure 7b illustrates a second implementation, equivalent to the previous one as to the effects obtained.
  • the collinear linear inductors 14 and 15 mounted in opposition are arranged vertically on the casting axis. In this way, this time activates directly the longitudinal branches 10a and 10b (whose presence within the secondary is at the very base of the invention), the upper inductor 14 then generating a magnetic field sliding up the casting machine towards the mold, the lower inductor 15 producing a field sliding down towards the bottom of the well.
  • Figure 8 illustrates a preferred embodiment of the invention. It consists in transforming the upper edge of the upper recirculation lobes L1 and L4 reinforcing the casting jets 7 and 7 'in active convection zones.
  • the pair of inductors already present in the secondary cooling are added to create the stirring cross 9, two additional linear inductors 16, 17 with horizontal sliding fields arranged collinearly on either side of the nozzle 4 at the level of metal jets 7 and 7 'emerging from the gills 5 and 5' and co-running with said jets, from the nozzle to the small walls 3, 3 'of the mold 1.
  • the effect of convergence between the jets and the central flow up from the bottom is thus further strengthened and, consequently, the local regime type "double loop" in the mold as well.
  • FIG. 9 similar to FIG. 5, however, differs essentially from this in that the directions of circulation of the metal in each of the four branches of the cross 9 are reversed.
  • This FIG. 9 thus illustrates the second main variant of implementation of the invention which consists in creating longitudinal antagonistic collinear currents 20a, 20b in the median part of the cast product 6 which this time converge towards each other in the direction of the point P so as to provide an overall circulation of the liquid metal which extends in the mold 1 by currents rising along the small faces 18, 18 'to the level of the metal jets 7, 7' from the exit ports 5, 5 'of the nozzle with which they oppose against the current to slow them down.
  • a decisive advantage of the invention is to ensure a good up / down exchange in the liquid well while being able to act remotely on the casting jets in the mold, and this by means of a mounting simple and rustic electromagnetic stirring equipment whose components are widely available commercially.
  • the invention consists, in short, judiciously use electromagnetic stirring means currently available to achieve in the secondary a cutting in the long direction of the product in two strands juxtaposed and in each strand, install a butterfly wing type brewing configuration. In doing so, we create an overall flow system in the secondary four-lobe whose heart is the stirring cross 9 with its center P.
  • this division into two strands will be half width of the cast product, that is to say along the longitudinal axis thereof, because this axis is generally confused with the casting axis.
  • the invention provides a total mixing of the metal on the metallurgical height capable of ensuring both thermal and chemical homogeneity between the top and bottom of the liquid well without depriving itself of the beneficial effects specific to ingot brewing and in the secondary cooling respectively, and without disturbing or even stabilizing the local flow mode in the mold.
  • linear inductors to be used conventionally have a planar structure, this provision is only preferential.
  • Curved inductors can also be used to better match the shape of the slab surface where they are placed on the metallurgical height.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Alcoholic Beverages (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP04805290A 2003-10-27 2004-10-22 Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee Expired - Lifetime EP1677928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0312555A FR2861324B1 (fr) 2003-10-27 2003-10-27 Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee
PCT/FR2004/002728 WO2005044487A1 (fr) 2003-10-27 2004-10-22 Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee

Publications (2)

Publication Number Publication Date
EP1677928A1 EP1677928A1 (fr) 2006-07-12
EP1677928B1 true EP1677928B1 (fr) 2007-04-18

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EP04805290A Expired - Lifetime EP1677928B1 (fr) 2003-10-27 2004-10-22 Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee

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US (1) US20070074845A1 (2)
EP (1) EP1677928B1 (2)
JP (1) JP4758903B2 (2)
KR (1) KR101089261B1 (2)
CN (1) CN100371108C (2)
AT (1) ATE359886T1 (2)
AU (1) AU2004286877B2 (2)
BR (1) BRPI0415903B1 (2)
CA (1) CA2543368A1 (2)
DE (1) DE602004006010T2 (2)
ES (1) ES2285558T3 (2)
FR (1) FR2861324B1 (2)
RU (1) RU2357833C2 (2)
TW (1) TWI324952B (2)
WO (1) WO2005044487A1 (2)
ZA (1) ZA200604177B (2)

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BRPI0621767B1 (pt) * 2006-07-07 2015-06-02 Rotelec Sa Processo e instalação de lingotamento contínuo de produtos metálicos planos
RU2389009C2 (ru) * 2008-06-05 2010-05-10 ООО "Нординкрафт-Сенсор" Устройство для получения и подготовки пробы для исследования электропроводного расплава
FR2957829B1 (fr) 2010-03-23 2012-11-09 Rotelec Sa Rouleau brasseur pour machine de coulee continu de brames
RU2457064C1 (ru) 2011-03-03 2012-07-27 Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" (Сфу) Способ для непрерывной и полунепрерывной разливки алюминиевых сплавов и устройство для его осуществления
RU2464123C1 (ru) * 2011-11-25 2012-10-20 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ регулирования режима электромагнитного перемешивания жидкой фазы слитка в машине непрерывного литья слябов и устройство для его осуществления
JP5874945B2 (ja) * 2012-03-27 2016-03-02 ロテレックＲｏｔｅｌｅｃ 幅の広い横断面の金属製品の連続鋳造機用の撹拌ロール
JP6087155B2 (ja) * 2013-01-23 2017-03-01 株式会社神戸製鋼所 チタンまたはチタン合金からなるスラブの連続鋳造方法
WO2015179680A2 (en) 2014-05-21 2015-11-26 Novelis Inc. Mixing eductor nozzle and flow control device
CN112687419B (zh) * 2020-12-18 2022-04-12 岭东核电有限公司 乏燃料除金属井及去除乏燃料上液态金属的方法
CN112876043B (zh) * 2021-02-24 2022-08-02 成都贝施美生物科技有限公司 一种可快速脱模的玻璃陶瓷制备模具
CN115608936B (zh) * 2022-10-24 2025-01-24 攀钢集团攀枝花钢铁研究院有限公司 一种用于大断面矩形坯连铸的高效电磁搅拌控制方法
CN116121610B (zh) * 2022-12-30 2024-10-18 湖南稀土金属材料研究院有限责任公司 镁锆中间合金及其制备方法
CN116213664B (zh) * 2023-03-27 2025-01-21 东北大学 一种连铸二冷区分节辊式多模式电磁搅拌控流装置

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Publication number Publication date
TW200533437A (en) 2005-10-16
TWI324952B (en) 2010-05-21
JP2007509752A (ja) 2007-04-19
KR20060120054A (ko) 2006-11-24
AU2004286877A1 (en) 2005-05-19
AU2004286877B2 (en) 2009-09-10
RU2006118350A (ru) 2007-12-10
CA2543368A1 (fr) 2005-05-19
CN1863625A (zh) 2006-11-15
WO2005044487A1 (fr) 2005-05-19
DE602004006010D1 (de) 2007-05-31
EP1677928A1 (fr) 2006-07-12
BRPI0415903A (pt) 2007-01-16
FR2861324A1 (fr) 2005-04-29
BRPI0415903B1 (pt) 2012-08-07
DE602004006010T2 (de) 2007-12-13
FR2861324B1 (fr) 2007-01-19
ES2285558T3 (es) 2007-11-16
ATE359886T1 (de) 2007-05-15
US20070074845A1 (en) 2007-04-05
CN100371108C (zh) 2008-02-27
ZA200604177B (en) 2007-12-27
KR101089261B1 (ko) 2011-12-02
JP4758903B2 (ja) 2011-08-31
RU2357833C2 (ru) 2009-06-10

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