EP0013441A1 - Dispositif et procédé pour le brassage électromagnétique dans une installation à coulée continue d'acier - Google Patents

Dispositif et procédé pour le brassage électromagnétique dans une installation à coulée continue d'acier Download PDF

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Publication number
EP0013441A1
EP0013441A1 EP79105417A EP79105417A EP0013441A1 EP 0013441 A1 EP0013441 A1 EP 0013441A1 EP 79105417 A EP79105417 A EP 79105417A EP 79105417 A EP79105417 A EP 79105417A EP 0013441 A1 EP0013441 A1 EP 0013441A1
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EP
European Patent Office
Prior art keywords
stirrers
stirring
stirrer
strand
generated
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.)
Ceased
Application number
EP79105417A
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German (de)
English (en)
Inventor
Markus Schmid
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.)
SMS Concast AG
Original Assignee
Concast Holding AG
Concast AG
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
Application filed by Concast Holding AG, Concast AG filed Critical Concast Holding AG
Publication of EP0013441A1 publication Critical patent/EP0013441A1/fr
Ceased legal-status Critical Current

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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the invention relates to a device for the electromagnetic stirring of strands in a steel strand g iessan- location, wherein generating traveling fields stirrer generate turbulent flows in the cast product and a method using the device.
  • twin casting enables an increase in the casting performance of the system at low cost, combined with a reduction in the casting time.
  • the stirring is carried out with electromagnetic, multi-phase stirrers arranged along the casting strand. These stirrers are mounted outside the support guide in such a way that one or a few guide rollers made of non-magnetic material are located between them and the strand surface. This arrangement is not suitable for stirring in plants for alternative casting.
  • a device is also known in which at least two stirrers are arranged one after the other on the side of the strand near the surface of the strand between the guide rollers in the longitudinal direction of the strand and induce traveling fields in or against the casting direction. This device is also not suitable for stirring in alternative continuous casting plants.
  • the invention has for its object to provide a device for stirring slabs or blooms in an alternative casting system with structurally simple means.
  • the device according to the invention is intended to create the prerequisites for a plurality of different stirring methods which are matched to the respective casting program.
  • stirrers are either directed towards a slab or individually at a block.
  • Two stirrers working independently of one another are required for individual stirring of two blooms.
  • two smaller stirrers instead of a single large one, with at least the same stirring effect do not mean any appreciable increase in the system costs.
  • Two stirrers have the advantage that different casting parameters, a variety of stirring processes with different metallurgical effects can be set through the targeted selection of boundary conditions.
  • the stirrers are effective from a broad side of the support guide.
  • the alternative stirring of a slab or two blooms is possible without additional equipment when changing the casting program.
  • the stirrers are rotatably arranged to change the direction of their traveling fields with respect to the longitudinal axis of the strand.
  • variable directions of action of the traveling fields generated are worth striving for. Due to the rotatable arrangement of the stirrers, every angle between the main direction of movement of the traveling fields and the direction of strand extraction can be adjusted.
  • the stirrers are expediently installed at essentially the same level.
  • two stirrers mounted at the same level if they act, for example, in the longitudinal direction of the strand, cause currents flowing in the strand core symmetrically to the longitudinal axis of the strand, with a balanced temperature profile in the sump uniform advancement of the solidification front with respect to the middle of the strand is guaranteed, whereby strand deformations are largely avoided.
  • stirrer when stirring blooms, it is advantageous if the stirrer is effective on the outer, unsupported strand side. This is particularly desirable when a large guide roller diameter is required to support the strand due to a large slab format, which would require a large distance from the strand surface and thus a poor efficiency of the stirrer. With a stirrer acting from the broad side of the support guide transversely to the direction of extraction of a bloom, a sufficient stirring effect cannot always be achieved due to the short effective length. A stirrer acting on the unguided strand side directly in the vicinity of the surface has substantially less losses in action, so that the desired stirring movement can also be achieved in the transverse direction.
  • stirrers on the narrow sides of the slab can be effective for smaller slabs.
  • the invention also includes that at least one of the stirrers is displaceable transversely to the longitudinal direction of the strand. Due to the mobility of one or both stirrers in the transverse direction, the degree of turbulence in the moving melt in a slab can be precisely adjusted by approximating the traveling fields until the overlap of both currents and can be adjusted to the respective casting parameters. When casting two blanks, the longitudinal axes of the blocks can easily be covered in the case of format variations due to the displaceability of the stirrers. A limitation of the applicability of the facility for only a slab or pre-block format is omitted. All strand formats that can be cast on the relevant continuous casting installation can also be stirred without difficulty.
  • the turbulent flows are generated by traveling fields of the same direction of action.
  • this has a decisive influence on the type and shape of the individual flows in the strand core. If, while stirring a slab, the stirrers are arranged in such a way that the partial flows generated by them complement each other, this affects the strength and size of the overall flow.
  • a large number of metallurgical effects result from the shape and size of the flow or the flows in the strand core, and different casting parameters can be taken into account in a targeted manner.
  • the turbulent flows are generated by moving fields acting in the longitudinal direction, advantageously by moving fields acting against the pull-out direction.
  • the resultant transport of cooler melt from lower-lying areas of the melting sump in the direction of the mold or the associated transport of hot melt flowing in the opposite direction results in a temperature compensation in the sump in the counter-flow area in the stirrer influence.
  • an increase in the temperature gradient is achieved directly on the solidification front combined with a reduction in the rate of solidification and a reduction in the heterogeneous layer, which favors the desired globular solidification.
  • the turbulent flows are perpendicular to the line moving hiking fields are generated.
  • the turbulent flows are generated by moving fields that produce the same amount of thrust, preferably due to the symmetrical loading of the phases of the coils of both stirrers.
  • the turbulent flows hit the solidified side wall of the strand, vortices are released.
  • the melt is circulated not only in the plane of the strand cross-section, but over a large area in the longitudinal direction of the strand, which advantageously exchanges the melt from the area of influence of the magnets with steel freshly flowing in from the mold and thus enables temperature compensation in the entire melt.
  • a further advantageous effect of the method results from stirring slabs if the turbulent flows are mutually influenced by the thrust forces generated by the traveling fields. This leads to another turbulence in the common effective range of the traveling fields, which is favorable in terms of avoiding signs of segregation.
  • asymmetrically, electrically acting on the phases of at least one stirrer within the traveling field produces differently acting thrust forces.
  • the swirling effect is further enhanced.
  • the turbulent flows are generated by traveling fields of opposite direction of action.
  • turbulent flows are generated independently of one another in both lines by asymmetrically acting on the phases of the two stirrers by shear forces acting differently in the traveling fields.
  • stirring blooms can be done by a stirrer currents caused in the respective strand sump can be achieved by asymmetrical loading of such turbulent flows that any strong segregations can be prevented with certainty.
  • FIG. 1 shows a top view of a partially shown section of a broad side in a support guide 6, which is arranged downstream of a mold, not shown, of an alternative continuous casting plant for steel for casting a slab 1 or — shown in broken lines — two bloom blocks 2. According to this example, only one slab size is shown or cast a block size.
  • Strand guide rollers are designated by 4.
  • Two electromagnetic stirrers 3 producing moving fields in the cast product are at the width side of the support guide rollers 5 attached. The rolls 5 below the stirrer 3, have made to reduce the A de bstän- between the impellers 3 and the surfaces of the respective strands 1, 2 has a smaller diameter and are made from non-magnetic material.
  • the central axis of the slab 1 is designated, with 7 and 7 'those of the two blooms 2.
  • An arrow shows the direction of strand extraction.
  • the stirrers 3 acting jointly on the slab 1 or individually on a bloom 2 are so firmly installed that after a mold change from slab to bloom format, the stirrer center axes running in the longitudinal direction of the strand overlap with the axes 7, 7 'of the blooms 2.
  • the stirrer sides 8, in this example extending transversely to the direction of extraction, are smaller than the block widths 9, so that no electrical losses have to be accepted.
  • the strand axes 7, 7 ' a symmetrical flow of the melt in the liquid strand core is produced and the electromagnetic forces generated are introduced as loss-free as possible.
  • the stirrers can be arranged in such a way that the traveling fields generated by them in the cast product 1, 2 generate turbulent flows that run both against and in as well as transverse to the longitudinal direction of the strand.
  • the resulting currents can reach up to the mold in order to influence the solidification behavior of the melt there as well.
  • the stirrer 3 can also have a rectangular, elongated shape instead of the square shown here.
  • the stirrer can be designed so that the moving field can be introduced into the strand with as little loss as possible so that one or more parts emanating from it Form of excitation pins, which serve to introduce the magnetic flux into the strand, extend between the guide rollers up to close to the surface of the strand.
  • stirrers 3 are attached at the same level.
  • the active directions of their traveling fields can be rectified or directed towards each other or at an angle to each other.
  • the strand formats mentioned can also be blanks or billets.
  • the stirrers are usually installed in the close range up to a few meters below the mold.
  • FIG. 2 shows a section similar to that shown in FIG. 1. With 1 the slab, with 2 in broken lines two blocks. The leadership roles have been omitted for clarity. A variety of strand formats are provided.
  • the electromagnetic stirrers are named 3. In contrast to the stirrers shown in FIG. 1, the stirrers shown here are rotatable, symbolized by arrows 10. As a result, different casting parameters, such as, for example, the casting temperature, pull-out speed, etc., can be dealt with by choosing the traveling field effective direction, as indicated by arrows 11.
  • stirrer 3 Due to the displaceability of the stirrer 3 in the direction of the arrow 12 transversely to the longitudinal axis 18 of the slab, the stirrer 3 can be aligned according to each strand format in such a way that it achieves an optimal stirring effect in the respective strand sump.
  • a position 3 'from the large number of possible stirrer positions is shown in dash-dot form.
  • the stirrers 3, 3 ' are mounted at essentially the same level, which means at equivalent locations Stirring movements with the same effect can be generated.
  • 3 to 9 schematically different features of the inventive method using the device are shown, guide rollers are not shown.
  • 3 to 5 show two agitators 3 acting on a slab 1, which produce turbulent flows through the traveling fields in the swamp.
  • the two-phase stirrer is indicated by the arrows 11.
  • the stirrers 3 are arranged at such a distance from one another that the partial flows caused by them in the strand 1 do not influence one another.
  • the coils of both stirrers 3 are supplied with the same, symmetrical electrical loading, for example 1000 A with a frequency of 2 Hz and 200 V voltage. This is symbolized by arrows 11 of the same size.
  • the traveling fields of each pair of coils 3 have the same direction of action.
  • the traveling fields of both stirrers act against the direction of extraction indicated by an arrow, in Fig. 4 transversely to this and in Fig. 5 in the direction of extraction.
  • the traveling fields can also be directed in the longitudinal direction of the strand and generate opposite, turbulent currents, which creates a circulating current in the swamp.
  • stirrers 3 acting against the direction of strand extraction - see arrows - whose traveling fields or the partial flows generated by these mutually influence one another. The mutual influence is indicated by arrows 13.
  • An identical electrical application to both stirrers 3 is shown in FIG. 6 by arrows 11 of the same size.
  • 7 shows two differently loaded stirrers 3, but the phases for stirrer coils 3, 3 'are symmetrical, ie for example the stirrer coils 3 with 1000 A and the coils 3' with 800 A, are fed.
  • the respective number of turns of the coils j 0 - the phase per stirrer is also the same, so that a moving field is created per stirrer with the same thrust forces within the moving field.
  • arrows 14, 15 at the bottom: cute symbolize an asymmetrical, electrical application of the phases of at least one stirrer.
  • the phase of the stirrer 3 is supplied with 900 A and the other with 800 A, while the first phase of the stirrer 3 'r-it is supplied with 600 A and the second with 500 A. Voltage and frequency are given above.
  • the second phase of the stirrer 3 'can also have the same action as the first phase, as indicated by dashed lines. In this way, differently acting thrust forces are generated within the traveling field, whereby different flow velocities also arise within the respective partial flow. In the mutual influence area of both flows 13 there is an effective turbulence.
  • the asymmetry of the electrical loading can also be achieved by differences in the current strength and / or the frequency of the individual phases. Differentiating the coil turns produces the same effects.
  • the stirrers can also be more than two-phase. For the sake of simplicity, only two phases are symbolized in the examples shown here.
  • FIG. 9 shows two stirrers 3 acting independently of one another, each on a bloom 2.
  • the phases 14, 15 of both stirrers are acted upon asymmetrically, as in FIG. 8, as a result of which the effects described above can be achieved.
  • the hiking fields act against the pull-out direction, however, every angle is between the main direction of action of the hiking fields and the longitudinal strands iron 7, 7 'possible. It is not imperative that the R üh- rer are mounted at the same level. 3
  • Fig. 10 shows the stirring on the unsupported sides of the strand and shows a stirring device while stirring two blooms.
  • Two stirrers 3, shown in dashed lines and acting on a slab (not shown here) in the longitudinal direction of the strand, are attached to the outer, unsupported strand side 16 and denoted by 3 ′′ due to excessive loss of effectiveness due to the excessive distance from the strand surface due to the excessively large roller diameter of the support guide rollers 5.
  • stirrer 3 there are no obstructing roller bearings for the broadside rollers on the unsupported, outer strand sides, so that the stirrer 3 with its active sides 17 are at an optimal distance from the strand surface 16 in order to achieve good efficiency
  • the stirrers can be moved in all directions and are designed in such a way that they can reach between the guide rollers as far as the side of the strand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP79105417A 1979-01-05 1979-12-31 Dispositif et procédé pour le brassage électromagnétique dans une installation à coulée continue d'acier Ceased EP0013441A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH76/79 1979-01-05
CH7679 1979-01-05

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EP0013441A1 true EP0013441A1 (fr) 1980-07-23

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EP79105417A Ceased EP0013441A1 (fr) 1979-01-05 1979-12-31 Dispositif et procédé pour le brassage électromagnétique dans une installation à coulée continue d'acier

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EP (1) EP0013441A1 (fr)
JP (1) JPS5592261A (fr)
CA (1) CA1155630A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068320A1 (fr) * 1981-06-20 1983-01-05 Nippon Steel Corporation Méthode et appareil d'agitation électromagnétique pour une installation de coulée continue du type à deux lignes
US4649985A (en) * 1983-08-11 1987-03-17 Kawasaki Steel Corporation Method of electromagnetic stirring a molten steel in a mold for a continuous casting
WO2014155357A1 (fr) * 2013-03-28 2014-10-02 Evgeny Pavlov Procédé et appareil permettant de déplacer du métal à l'état fondu
AT518460A1 (de) * 2016-03-21 2017-10-15 Primetals Technologies Austria GmbH Einen Metallstrang partiell umgreifende Rührspule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568617A (en) * 1983-08-08 1986-02-04 Wilkes Donald F Thin bands and method and apparatus for production thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962341B2 (de) * 1969-12-12 1971-06-24 Aeg Elotherm Gmbh Anordnung einer mehrphasigen elektromagnetischen wicklung am strangfuehrungsgeruest einer stranggiessanlage
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen
GB1454704A (en) * 1973-05-21 1976-11-03 Siderurgie Fse Inst Rech Method of controlling the solidification structure of a continuous-cast metal product by electromagnetic agitation
US4016926A (en) * 1974-03-23 1977-04-12 Sumitomo Electric Industries, Ltd. Electro-magnetic strirrer for continuous casting machine
DE2731238A1 (de) * 1976-07-13 1978-01-26 Siderurgie Fse Inst Rech Verfahren und vorrichtung zum kontinuierlichen vergiessen insbesondere von stahl unter einwirkung eines magnetischen wanderfeldes
DE2819160A1 (de) * 1977-05-18 1978-11-30 Siderurgie Fse Inst Rech Verfahren und vorrichtung zum kontinuierlichen vergiessen von in einer kokille rotierendem schmelzfluessigem metall
DE2756623A1 (de) * 1977-12-19 1979-06-21 Aeg Elotherm Gmbh Vorrichtung an stranggussanlagen zum elektromagnetischen ruehren der erstarrenden stranggussmasse
DE2810491A1 (de) * 1978-03-08 1979-09-20 Aeg Elotherm Gmbh Verfahren zur beeinflussung der erstarrung einer schmelze waehrend des stranggiessens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962341B2 (de) * 1969-12-12 1971-06-24 Aeg Elotherm Gmbh Anordnung einer mehrphasigen elektromagnetischen wicklung am strangfuehrungsgeruest einer stranggiessanlage
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen
GB1454704A (en) * 1973-05-21 1976-11-03 Siderurgie Fse Inst Rech Method of controlling the solidification structure of a continuous-cast metal product by electromagnetic agitation
US4016926A (en) * 1974-03-23 1977-04-12 Sumitomo Electric Industries, Ltd. Electro-magnetic strirrer for continuous casting machine
DE2731238A1 (de) * 1976-07-13 1978-01-26 Siderurgie Fse Inst Rech Verfahren und vorrichtung zum kontinuierlichen vergiessen insbesondere von stahl unter einwirkung eines magnetischen wanderfeldes
DE2819160A1 (de) * 1977-05-18 1978-11-30 Siderurgie Fse Inst Rech Verfahren und vorrichtung zum kontinuierlichen vergiessen von in einer kokille rotierendem schmelzfluessigem metall
DE2756623A1 (de) * 1977-12-19 1979-06-21 Aeg Elotherm Gmbh Vorrichtung an stranggussanlagen zum elektromagnetischen ruehren der erstarrenden stranggussmasse
DE2810491A1 (de) * 1978-03-08 1979-09-20 Aeg Elotherm Gmbh Verfahren zur beeinflussung der erstarrung einer schmelze waehrend des stranggiessens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STAHL UND EISEN, Band 98, Nr. 22, November 1978, Dusseldorf "Neueste Entwicklungen zum elektromagnetischen Ruhren beim Stranggiessen von Stahl" * Seiten 1179 to 1186 * *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068320A1 (fr) * 1981-06-20 1983-01-05 Nippon Steel Corporation Méthode et appareil d'agitation électromagnétique pour une installation de coulée continue du type à deux lignes
US4567937A (en) * 1981-06-20 1986-02-04 Nippon Steel Corporation Electromagnetic stirring method and device for double casting type continuous casting apparatus
US4649985A (en) * 1983-08-11 1987-03-17 Kawasaki Steel Corporation Method of electromagnetic stirring a molten steel in a mold for a continuous casting
WO2014155357A1 (fr) * 2013-03-28 2014-10-02 Evgeny Pavlov Procédé et appareil permettant de déplacer du métal à l'état fondu
CN105263652A (zh) * 2013-03-28 2016-01-20 叶夫盖尼·帕夫洛夫 移动熔融金属的方法及装置
US9901978B2 (en) 2013-03-28 2018-02-27 Evgeny Pavlov Method and apparatus for moving molten metal
CN105263652B (zh) * 2013-03-28 2018-05-29 叶夫盖尼·帕夫洛夫 移动熔融金属的方法及装置
RU2656193C2 (ru) * 2013-03-28 2018-05-31 Евгений Александрович Павлов Способ, устройство и система для перемешивания расплавленного металла
AT518460A1 (de) * 2016-03-21 2017-10-15 Primetals Technologies Austria GmbH Einen Metallstrang partiell umgreifende Rührspule
AT518460B1 (de) * 2016-03-21 2021-07-15 Primetals Technologies Austria GmbH Einen Metallstrang partiell umgreifende Rührspule

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Publication number Publication date
CA1155630A (fr) 1983-10-25
JPS5592261A (en) 1980-07-12

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