EP3134220A1 - Procédé et dispositif de coulée continue de brames minces - Google Patents

Procédé et dispositif de coulée continue de brames minces

Info

Publication number
EP3134220A1
EP3134220A1 EP15716054.0A EP15716054A EP3134220A1 EP 3134220 A1 EP3134220 A1 EP 3134220A1 EP 15716054 A EP15716054 A EP 15716054A EP 3134220 A1 EP3134220 A1 EP 3134220A1
Authority
EP
European Patent Office
Prior art keywords
strand
thin slab
electromagnetic
slab strand
mold
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
EP15716054.0A
Other languages
German (de)
English (en)
Other versions
EP3134220B2 (fr
EP3134220B1 (fr
Inventor
Eberhard Sowka
Frank Spelleken
Andy Rohe
Helmut OSTERBURG
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.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp 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
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Application filed by ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3134220A1 publication Critical patent/EP3134220A1/fr
Application granted granted Critical
Publication of EP3134220B1 publication Critical patent/EP3134220B1/fr
Publication of EP3134220B2 publication Critical patent/EP3134220B2/fr
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Anticipated expiration legal-status Critical

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
    • B22D11/12—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
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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
    • 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the present invention is based on a method for thin-slab continuous casting according to the preamble of claim 1.
  • a metallic melt is produced, which is transferred by means of a steel ladle in a distributor. From the distributor, the metallic melt flows via a pouring tube into a mold, which is moved in a cooled and oscillating manner. In the mold, a strand is formed from the metallic melt with a solidified shell and a largely not yet solidified cross-section within the solidified shell. When leaving the mold, the strand is taken up by a transport system with a plurality of strand guide rollers, between which the strand is passed through the so-called pouring arc and is cooled to complete solidification.
  • EBR Electromagnetic Brake
  • the mold typically has a funnel-shaped enlarged cross section in the upper part and a rectangular cross section in the lower part. Due to these small thicknesses, the solidification times in thin-slab continuous casting are comparatively short and the proportion of liquid melt in the interior of the partially solidified strand is low. This inevitably results in a coarse, strictly directed, columnar structure in the
  • a device for casting metal comprising a mold for forming a cast strand and means for supplying a primary flow of hot metallic melt to the mold.
  • the device in this case has a magnetic device which applies a static or periodic magnetic field to the flow of the metal in the non-solidified parts of the cast strand to act on the molten metal in the mold during casting. In this way, the flow of the hot metal is to be braked and split to achieve a secondary flow pattern in the mold.
  • Thin slab enable in order to prevent the prior art caused by a coarse, strictly directed, columnar structure in the thin slab strand disadvantages. Furthermore, the risk of Tauchrohrzu GmbHen should be avoided by too low overheating.
  • This object is achieved with a method for thin slab continuous casting comprising the method steps: supplying a metallic melt into a mold, forming a partially solidified thin slab strand from the metallic melt in the mold, reducing the flow rate of the metallic melt in
  • partially solidified thin slab strand by means of an arranged in the mold chill electromagnetic brake (EMBR) and discharging the partially solidified thin slab strand from the mold by means of a strand guiding system, wherein non-solidified parts of the partially solidified thin slab strand arranged downstream of the mold under the strand withdrawal direction of the thin slab strand downstream
  • EMBR mold chill electromagnetic brake
  • Thin slab strand is generated.
  • Electromagnetic brake is prevented that the increase of the flow velocity of the molten steel in the mold area induced by the stirrer to excessively high local BadLiteschwankache, i. to BadLiteschwankache of, for example, more than 15 mm leads. High turbulence at the bath level can lead to strand breakthroughs or strand surface defects due to the bath level of the mold
  • Overheating degradation is effected, which advantageously to form a sufficiently large, i. in particular at least 30% in the thickness direction, core zone with fine-grained, globuliticianm structure inside the thin slab strand leads, while coarse, columnar crystalline structures are limited by the stirring.
  • core zone with fine-grained, globuliticianm structure inside the thin slab strand leads, while coarse, columnar crystalline structures are limited by the stirring.
  • this fine-grained, globulitic core zone forms in the solidification structure, whereby the formation of stem crystals between the edge zone and the center region of the strand is greatly reduced.
  • the expansion of the globulitic core zone in the thickness direction is then in particular at least 30%.
  • the electromagnetic stirrer is arranged such that the traveling field acts immediately below the mold on the not yet solidified parts of the strand, since a positive effect on the grain structure in already solidified parts of the strand by the traveling field is no longer possible.
  • the electromagnetic traveling field is generated in a region along the strand withdrawal direction between 50 and 3,000 millimeters away from the mold or from the bottom of the mold. It is also conceivable, the position of the electromagnetic stirrer or the
  • the distance to the bath level along the strand withdrawal direction preferably comprises between 0.9 and 3.8 meters and preferably between 1, 5 and 2.5 meters.
  • either a single electromagnetic stirrer is disposed on one side of the thin slab strand, either on the fixed side or the loose side, or it is disposed on either side, i.e., on either side. arranged a separate electromagnetic stirrer both on the fixed side, as well as on the lot side.
  • Strand guide segments referred to which always remains unchanged in position and serves as a so-called reference line. Adjustments to the strand thickness formats are then always made on the opposite lot side.
  • the process according to the invention is used in particular for the production of thin slabs in the continuous casting process and hot strip or cold strip produced therefrom.
  • the hot strip or cold strip is used in particular for the production of electrical sheets (non-grain oriented or grain oriented) or sheets of higher strength steels with yield strength values greater than 400 megapascals (eg tempered steel).
  • a thin slab in the sense of the present invention comprises in particular a slab with a thickness of between 40 and 120 millimeters.
  • two transverse directions, a first transverse direction and a second transverse direction are mentioned below next to the strand withdrawal direction.
  • the first transverse direction always runs perpendicular to the
  • the non-solidified parts within the mold and / or during the discharge of the partially solidified thin slab strand from the mold through the strand guide system by means of the electromagnetic stirrer, which is positioned below the mold, are stirred.
  • this ensures that when stirring the proportion of not yet solidified metal melt inside the thin slab strand is still sufficiently large, ie at least 50% of the strand thickness is to obtain a cross-section as large-scale core zone with fine-grained, globulitic structure, ie to obtain a globulitic core zone having a thicknesswise extension of the slab of at least 30%.
  • the electromagnetic stirrer is adjusted such that the electromagnetic traveling field along a second transverse direction, which is perpendicular to the strand withdrawal direction and parallel to a strand surface on a broad side of the thin slab strand, from a first edge region of the thin slab strand to a first edge region opposite the second edge region of
  • Electromagnetic traveling field after a period of 1 to 60 seconds, more preferably between 1 and 10 seconds, vice versa, so that the
  • Thin slab strand runs After a lapse of the period of 1 to 60 seconds, preferably again 1 to 10 seconds, the traveling electromagnetic field is reversed again and the cycle begins again.
  • the electromagnetic stirrer is adjusted so that a first subfield of the electromagnetic traveling field from the center of the thin slab strand to a first edge region of the thin slab strand runs and that a second subfield of the electromagnetic traveling field from the center to a the first edge region opposite second edge region of the thin slab strand runs. It is preferred this electromagnetic traveling field 1 to 60 seconds, more preferably held between 1 and 10 seconds. Thereafter, the electromagnetic traveling field generated by the electromagnetic stirrer and thus the direction of the two subfields are reversed. This reverse electromagnetic traveling field is also preferably maintained between 1 to 60 seconds, and more preferably between 1 and 10 seconds. Thereafter, the traveling electromagnetic field is reversed again and the cycle starts again.
  • This preferred embodiment ensures a symmetrical stirring of the not yet solidified metallic melt within the already solidified edge zone of the thin slab strand, so that a symmetrical solidification structure with fine, globulitic grains is formed.
  • the invention provides that a bidirectional, symmetrical electromagnetic traveling field over the width of the thin slab strand is generated by means of the electromagnetic stirrer, wherein the electromagnetic stirrer is adjusted such that a first subfield of the electromagnetic traveling field from a first edge region of the
  • Thin slab strand runs to the center of the thin slab strand and that a second subfield of the electromagnetic traveling field from a first edge region opposite the second edge region of the thin slab strand runs to the center of the thin slab strand.
  • this electromagnetic traveling field is held for 1 to 60 seconds, in particular between 1 and 10 seconds.
  • the electromagnetic traveling field generated by the electromagnetic stirrer and thus the direction of the two subfields are reversed.
  • This reverse electromagnetic traveling field is also held between 1 to 60 seconds, in particular between 1 and 10 seconds.
  • the traveling electromagnetic field is reversed again and the cycle starts again.
  • This preferred embodiment also ensures a symmetrical stirring of the not yet solidified metallic melt within the already solidified edge zone of the thin slab strand, so that a symmetrical
  • Solidification structure with fine, globulitic grains arises.
  • an electromagnetic traveling field is generated across the width of the thin slab strand whose magnetic flux density averages preferably 0.1 to 0.6 Tesla, particularly preferably 0.3 to 0, 5 Tesla and most preferably substantially 0.4 Tesla. It has been found that an alternating field with amplitudes in the range of preferably 0.1 to 0.6 Tesla, more preferably 0.3 to 0.5 Tesla and most preferably substantially 0.4 Tesla sufficient to achieve an accelerated and uniform overheating degradation in the metallic melt.
  • Thin slab strand ensures the accelerated and even removal of the
  • Stirring frequency is at least 0.1 Hz or at most 10 hertz and preferably between 1 and 10 Hz. It has been shown that this stirring frequency range is particularly advantageous. At a stirring frequency less than 0.1 Hz is no electromagnetic traveling field, so that no stirring effect occurs. If the stirring frequency is greater than 10 Hz, then the penetration depth of the electromagnetic traveling field in the strand interior is too low and no structural refinement is achieved.
  • an electromagnetic field is generated within the mold whose magnetic flux density preferably 0.1 to 0.3 Tesla, more preferably 0.15 to 0.25 Tesla and all particularly preferred in
  • the magnetic field strengths of the electromagnetic traveling field caused by the electromagnetic stirrer and of the field caused by the electromagnetic brake are matched to one another. It has been found that a tuning of the magnetic field strengths of the traveling electromagnetic field caused by the electromagnetic stirrer and the field caused by the electromagnetic brake is advantageous.
  • the vote is preferably carried out by the magnetic field strength of the field of the electromagnetic brake is raised by between 20 and 80% of its basic value between 0.1 and 0.3 Tesla when the electromagnetic stirrer is switched on.
  • the basic value in this context is the
  • Magnetic field strength of the field of electromagnetic brake understood as it is typically used without additional use of an electromagnetic stirrer.
  • Typical basic settings for an electromagnetic brake without the use of an electromagnetic stirrer are fields with magnetic field strengths between 0.08 and 0.2 Tesla.
  • Another object of the present invention for solving the above object is a device for thin slab continuous casting, in particular under
  • a thin slab strand of the metallic melt an electromagnetic brake arranged in the region of the mold for reducing the flow velocity of the metallic melt inside the partially solidified strand inside the mold, and a strand guiding system for discharging the partially solidified thin slab strand from the mold, the device further comprising one along the strand withdrawal direction of the thin slab strand downstream below the mold
  • electromagnetic stirrer for stirring non-solidified parts of the partially solidified thin slab strand, wherein the electromagnetic stirrer along the
  • Strand withdrawal direction between 20 and 7,000 millimeters from the mold is spaced.
  • Continuous casting is stirred, whereby a refinement of the solidification structure is achieved inside the thin slab strand.
  • the stirring of the metallic melt provides for an accelerated and uniform overheating degradation, which advantageously results in the formation of a core zone with a fine-grained, globulitic structure inside the
  • the electromagnetic stirrer in particular generates a spatially and / or temporally variable magnetic field in the region of the thin slab strand.
  • the electromagnetic stirrer preferably comprises a linear-field stirrer, which is arranged on one of the two broad sides of the thin-slab strand. It would also be conceivable, however, that a respective linear field stirrer is arranged on both opposite broad sides of the thin slab strand.
  • the electromagnetic stirrer comprises a rotary field stirrer or a helicoidal stirrer.
  • the electromagnetic stirrer is along the strand withdrawal direction of
  • Solidification microstructure is achieved. Basically the proportion of the globulitic core zone in the thin slab is greater the closer the electromagnetic stirrer to the meniscus of the
  • Strand withdrawal direction should be 20 to 7,000 millimeters and preferably 50 to 3,000 millimeters from the mold and in particular spaced from the mold base should be arranged.
  • the distance between the electromagnetic stirrer and the bath mirror preferably comprises between 0.9 and 3.8 meters, and preferably between 1, 5 and 2.5 meters.
  • the device according to the invention is used in particular for the production of thin slabs in the continuous casting process and hot strip or cold strip produced therefrom.
  • the hot strip or cold strip is used in particular for the production of electrical sheets (not grain-oriented or grain-oriented) or sheets of higher-strength steels with yield strength values greater than 400 megapascals (for example tempered steel).
  • a thin slab in the sense of In particular, the present invention includes a slab having a thickness of between 40 to 120 millimeters.
  • the electromagnetic stirrer comprises a linear field stirrer for generating an electromagnetic traveling field in the region of the thin slab strand, wherein the running direction of the electromagnetic traveling field parallel to the second
  • the electromagnetic stirrer is configured such that a first subfield of the traveling electromagnetic field travels from the center of the thin slab strand to a first edge region of the thin slab strand and a second subfield of the traveling electromagnetic field travels from the center to a second edge region of the thin slab strand opposite to the first edge region.
  • This electromagnetic traveling field is held between 1 and 60 seconds, preferably between 1 and 10 seconds. Thereafter, it is reversed, so that the first sub-field from the first edge region of the thin slab strand and the second sub-field from the second, the first edge region opposite edge region of the thin slab strand run to the center of the thin slab strand. Also this field is held between 1 and 60 seconds, preferably between 1 and 10 seconds.
  • Strand shell growth over the strand width be brought about. In this way it is prevented that strand breaks or surface longitudinal cracks occur.
  • the electromagnetic stirrer is adjusted such that the flow velocity of the metallic melt produced by the stirrer is at least 0.2 meters per second or at most 0.7 meters per second, and in particular between 0, 2 to 0.7 meters per second. In this way, it is ensured that on the one hand the strand shell growth on the narrow side of the strand is not weakened too much (reduction of strand breakage risk) and on the other hand strong
  • Element depletion (so-called white bands, ie depletion of C, Mn, Si, P, S, etc.) can be avoided on the solidification front in the effective range of the stirrer. It has been shown that the flow rate should not be less than 0.2 meters per second, because otherwise sufficient structural refinement can not be achieved. For example, a globulitic core zone can not be considered sufficient. whose thickness expansion is less than 30%.
  • flow velocity should not be greater than 0.7 meters per second in order to avoid a depletion of the melt on alloying elements in the region of the solidification front.
  • the depletion of the melt on alloying elements in the area of the solidification front can be measured in the solidified material. This phenomenon is called “white bands” or “white stripes”. White bands lead to inhomogeneous ones
  • the electromagnetic brake in the upper half of the mold 20 to 150 millimeters, preferably 25 to 100 millimeters, and more preferably in
  • Figure 1 shows a schematic sectional view of an apparatus for
  • FIGS. 2a and 2b show schematic detail views of the device for
  • Embodiment of the present invention in the area of the mold and below the mold.
  • FIG. 1 shows a schematic sectional view of a device 1 for producing thin slabs in the continuous casting method according to an exemplary embodiment of the present invention.
  • metallic melt 2 is transferred from a steel ladle 6 into a distributor 3 and poured from the distributor 3 via a pouring tube 4 (feeding means) into a mold 5 of the device 1.
  • the flow through the pouring tube is in
  • the mold 5 comprises a mold having a downwardly open passage opening with a rectangular cross-section.
  • the broad sides 28 of the mold are spaced between 40 and 120 millimeters apart so that the mold 5 is suitable for casting thin slabs.
  • the mold consists of water-cooled copper plates, which cause a solidification of the supplied metallic melt in the edge region of the mold 5. In the mold 5 thus forms from the continuously supplied metallic melt 2 a
  • the mold 5 oscillates, so that adhesion of the strand surface is prevented at the mold 5.
  • Thin slab strand 9 passes through the mold 5 along a vertical strand withdrawal direction 15.
  • the thin slab strand 9 is taken up by a transport system 12 (also referred to as a strand guiding system) with a plurality of strand guide rollers 13 and passed through a so-called pouring arc 14.
  • the thin slab strand 9 is cooled until complete solidification.
  • first transverse direction 18 runs perpendicular to the strand withdrawal direction 15 and parallel to a strand surface normal
  • an electromagnetic brake 16 (EMBR: EBR
  • FIG. 16 includes two coils arranged on both sides of the thin slab strand 9.
  • the electromagnetic brake 16 an electromagnetic field is generated within the mold 5, the magnetic flux density is preferably 0.1 to 0.3 Tesla and more preferably substantially 0.2 Tesla.
  • the device 1 according to the invention has a
  • the electromagnetic stirrer 17 for stirring non-solidified parts of the partially solidified thin slab strand 9.
  • the electromagnetic stirrer 17 comprises a linear-field stirrer which extends along one of the two broad sides 28 of the strand.
  • the linear field stirrer generates over the width of the thin slab strand 9 an electromagnetic traveling field 19 (see FIGS. 2 a and 2 b) which runs along a direction perpendicular to the strand withdrawal direction 15 and parallel to the broad side 28 of the strand surface second transverse direction 30 cyclically between a first edge region 20 of
  • the traveling electromagnetic field 19 is generated in a region along the strand withdrawal direction 15 between 20 and 7,000 millimeters, preferably between 50 and 3,000 millimeters, away from the mold 5 and from the mold bottom 29 and comprises on average a magnetic flux density between 0.1 to zero , 6 Tesla and preferably of substantially 0.4 Tesla.
  • Thin slab strand is less than 0.7 meters per second and preferably between 0.2 and 0.7 meters per second. Despite the short through - solidification times and small volume liquid contents inside the continuous casting of thin slabs
  • Thin slab strand 9 then forms the fine-grained, globulitic core zone in
  • Edge zone and the center region of the thin slab strand 9 is suppressed.
  • a final product produced from the continuously cast thin slabs thus can Longitudinal streaks, microstructures, Kernseigerept and mecanicrissan tokeiten decreased and the HIC resistance and the homogeneity of the mechanical and
  • Processes are made of thin slabs, in particular for hot strip or cold strip.
  • the hot strip or cold strip is in particular for the production of electrical steel sheets (non-grain oriented or grain oriented) or sheets of higher strength steels
  • Yield strength values greater than 400 megapascals are used.
  • FIGs 2a and 2b are schematic detail views of the device 1 for
  • FIGS. 2 a and 2 b Cross-sectional view illustrated along a direction parallel to the strand withdrawal direction 15 and parallel to the second transverse direction 30 Thomasschebene.
  • a sectional view is shown in each case along a direction perpendicular to the strand withdrawal direction 15, ie. perpendicular to the first transverse direction 18 and the second transverse direction 30
  • the supply means comprises the pouring tube 4, which dips into the metallic melt 2 located in the mold 5, and spout holes 22 formed below the pouring mirror 7 on the pouring tube 4 in the lower part of the pouring tube 4.
  • the metallic melt 2 is introduced by means of the spout holes 22 at an angle to the strand withdrawal direction 15 of the thin slab strand 9 (see flow arrows 23).
  • the electromagnetic stirrer 17, which is arranged below the mold 5, generates below the mold 5, the electromagnetic traveling field 19, which in turn causes currents that can reach into the mold 5 - possibly even up to
  • the electromagnetic stirrer 17 is configured such that the traveling electromagnetic field 19 comprises two subfields, a first subfield 24 and a second subfield 25.
  • the first subfield 24 of the traveling electromagnetic field 19 comprises two subfields, a first subfield 24 and a second subfield 25.
  • the movement of the electromagnetic traveling field 19 is represented schematically by the movement arrows 27.
  • the division of the electromagnetic traveling field 19 into two bidirectional, symmetrical subfields leads to a uniform and symmetrical flow in the interior of the thin slab strand 9 and thus also to a rapid and uniform removal of the overheating. On the one hand, this is intended to bring about homogeneous microstructural refinement in the strand interior and, on the other hand, uniform strand shell growth over the strand width. In this way is prevented by the electromagnetic stirring the potential danger of
  • the electromagnetic stirrer 17 is preferably further adjusted such that the flow velocity of the metallic melt generated by the stirrer at the solidification front is between 0.2 to 0.7 meters per second. In this way, it is ensured that, on the one hand, the strand shell growth on the narrow side of the strand is not weakened too much
  • Electromagnetic stirrer 17 generated currents in the metallic melt 2 not to increased Badaptschwankept and not to be enlarged local
  • the magnetic field strengths of the electromagnetic stirrer 17 and the electromagnetic brake 16 should be matched to one another.
  • the tuning takes place, for example, by raising the magnetic field strength of the electromagnetic brake 16 by 20 to 80% of its basic value to values between 0.1 and 0.3 Tesla when the electromagnetic stirrer 17 is switched on.
  • the basic value in this context is the magnetic field strength of the electromagnetic brake 16, as is typically used without the additional use of an electromagnetic stirrer 17. Typical basic settings for a
  • Electromagnetic brake 16 without use of an electromagnetic stirrer 17 are 0.08 to 0.2 Tesla.
  • the electromagnetic traveling field 19 or the two subfields 24, 25 migrate along the broad sides 28 through the thin slab strand 9.
  • the traveling electromagnetic field 19 is not divided into two sub-fields 24, 25, but runs cyclically along the second transverse direction 30 between the first edge region 20 of the thin-slab strand 9 and the opposite second
  • This exemplary embodiment is illustrated by way of example in FIG. 2b.
  • Thin-slab strand is the share of the globulitic core zone (GKZ).
  • T thickness (T) strand surface (mm) only EMBR EMBR + EMS
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the share of the globulitic core zone should be at least 30 percent and preferably greater than 50 percent. Overheating of less than 20 K is to be avoided, however, as problems would otherwise occur in the form of clogging of the dip tubes in the mold, which may result in strand surface defects or even strand breakthroughs.
  • the following is the example of the dynamo steel with 2.4% silicon and thin slabs with a thickness of 63 millimeters, an overheating in the tundish of 30 Kelvin, a strand width of 1550 millimeters and a mold height of 1 100 millimeters, the
  • the electromagnetic stirrer is between 4 and 6 m / min for a 50 percent globulite core zone between 2.6 and 3.8 meters, 60 percent between 1, 7 and 2.5 meters below the bath level of the mold must be arranged. Satisfactory results are achieved even with a distance of the electromagnetic stirrer from the bath level between 3.6 and 7.3 meters.
  • the distance between the mold or the base of the mold and the electromagnetic stirrer is thus advantageously between 20 and 7,000 millimeters and preferably between 50 and 3,000 millimeters.
  • a distance between 100 and 7,000 millimeters, between 500 and 6,500 millimeters, between 700 and 6,300 millimeters, between 700 and 4,400 millimeters or between 700 and 2,800 millimeters is particularly advantageous.
  • Second transverse direction (runs perpendicular to the strand withdrawal direction and parallel to the strand surface on the slab width side or perpendicular to the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un procédé de coulée continue de brames minces comprenant les étapes suivantes consistant à : amener une masse fondue métallique dans une lingotière, mouler une barre de brames minces en partie rigidifiées à partir de la masse fondue métallique dans la lingotière, réduire la vitesse d'écoulement de la masse fondue métallique dans la barre de brames minces en partie rigidifiées au moyen d'un frein électromagnétique (EMBR) disposé dans la zone de la lingotière, et évacuer la barre de brames minces en partie rigidifiées de la lingotière au moyen d'un système de guidage de barre. Les parties non rigidifiées de la barre de brames minces en partie rigidifiées sont agitées au moyen d'un agitateur électromagnétique disposé le long de la direction d'extraction de la barre de brames minces, en aval, et au-dessous de la lingotière. Un champ électromagnétique d'ondes progressives est produit dans une zone de la barre de brames minces, éloignée de la lingotière d'une valeur comprise entre 20 et 7 000 millimètres, le long de la direction d'extraction de la barre, au moyen de l'agitateur électromagnétique.
EP15716054.0A 2014-04-25 2015-04-15 Procédé et dispositif de coulée continue de brames minces Active EP3134220B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014105870.4A DE102014105870B4 (de) 2014-04-25 2014-04-25 Verfahren und Vorrichtung zum Dünnbrammen-Stranggießen
PCT/EP2015/058130 WO2015162039A1 (fr) 2014-04-25 2015-04-15 Procédé et dispositif de coulée continue de brames minces

Publications (3)

Publication Number Publication Date
EP3134220A1 true EP3134220A1 (fr) 2017-03-01
EP3134220B1 EP3134220B1 (fr) 2019-09-04
EP3134220B2 EP3134220B2 (fr) 2025-01-22

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EP15716054.0A Active EP3134220B2 (fr) 2014-04-25 2015-04-15 Procédé et dispositif de coulée continue de brames minces

Country Status (7)

Country Link
US (1) US10486228B2 (fr)
EP (1) EP3134220B2 (fr)
KR (1) KR20160146914A (fr)
CN (1) CN106536087B (fr)
DE (1) DE102014105870B4 (fr)
ES (1) ES2756700T5 (fr)
WO (1) WO2015162039A1 (fr)

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SK7957Y1 (sk) * 2016-04-29 2017-12-04 Pokusova Marcela Spôsob riadenia procesu tuhnutia kontinuálne liatych kovov a zliatin a zariadenie na uskutočňovanie tohto spôsobu
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EP3134220B2 (fr) 2025-01-22
ES2756700T5 (en) 2025-05-19
CN106536087B (zh) 2020-07-24
WO2015162039A1 (fr) 2015-10-29
DE102014105870A1 (de) 2015-10-29
CN106536087A (zh) 2017-03-22
ES2756700T3 (es) 2020-04-27
EP3134220B1 (fr) 2019-09-04
US10486228B2 (en) 2019-11-26
KR20160146914A (ko) 2016-12-21
US20170036267A1 (en) 2017-02-09

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