EP0045938A1 - Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue - Google Patents

Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue Download PDF

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Publication number
EP0045938A1
EP0045938A1 EP81106112A EP81106112A EP0045938A1 EP 0045938 A1 EP0045938 A1 EP 0045938A1 EP 81106112 A EP81106112 A EP 81106112A EP 81106112 A EP81106112 A EP 81106112A EP 0045938 A1 EP0045938 A1 EP 0045938A1
Authority
EP
European Patent Office
Prior art keywords
strand
coil
flow
stirring
longitudinal axis
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.)
Withdrawn
Application number
EP81106112A
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German (de)
English (en)
Inventor
Axel-Ingo Haefeker
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
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 filed Critical Concast Holding AG
Publication of EP0045938A1 publication Critical patent/EP0045938A1/fr
Withdrawn legal-status Critical Current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
    • B22D11/10—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
    • B22D11/12—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 present invention relates to a method for stirring a strand with a rectangular cross-section in a steel continuous casting installation with the aid of an electromagnetic stirring coil, wherein a circulating flow which is deflected on one of the narrow sides of the strand is generated in the liquid core, and a device for carrying out the method.
  • the structure of a strand produced using the continuous casting process is, inter alia, depends essentially on the casting temperature and the steel composition.
  • a structure of directional dendrites is usually formed, while at casting temperatures near the liquidus temperature, an undirected dendritic and / or a globulitic structure is formed.
  • Steel accompanying elements that tend to segregate preferentially deposit in the middle of the strand in the case of directionally dendritic solidified slabs, where they form a strongly positively segregated band, the so-called core segregation.
  • the casting material tends to break open along these segregation bands or along the grain boundaries of the dendrites, which results in material waste. It is therefore the endeavor of every continuous caster to produce strands with a fine-grained globulitic structure along with an even distribution of elements that tend to segregate over the strand cross-section.
  • a W eg, to achieve this goal is to place the liquid core strand during solidification by means of electromagnetic traveling fields in a circumferential motion.
  • a coil with its longitudinal extension is arranged parallel to the strand surface and perpendicular to the casting direction behind strand guide rollers on its broad side.
  • Such a coil can be constructed as described in SE-AS 404 585, namely it consists of a number of coil parts which represent magnetic poles. These coil parts are connected to one another in such a way that four of them form the one and the remaining two the other phase of the electromagnetic stirring coil operated with two-phase alternating current, both phases being acted upon with the same current strength.
  • the spatial extent or the number of turns of the two coil parts connected to one another is such that they generate an approximately equally strong field as the remaining four, also connected to one another.
  • a moving field is generated when the two agitator phases are electrically offset from one another in time.
  • a migratory force acting perpendicular to the longitudinal axis of the strand acts on the sump of the strand, which causes the metal to flow towards the narrow side. For the first time, this flow is deflected upwards and downwards when it hits the already solidified strand shell in such a way that two self-contained flow rollers are formed. Due to the flow conditions arise known to be at the B ramming broadsides three intense, so-called white bands and in areas of the train narrow sides due to the increased turbulence of a much wider white band. These bands represent negatively increased areas in the solidification structure and are because they are too anisotropic material properties, undesirable for most steel grades.
  • JP-OS 52-60.228 In another known stirring method (JP-OS 52-60.228), a plurality of electromagnetic stirring devices are arranged on the broad side surfaces of the casting strand in a plurality of steps one below the other, obliquely to the longitudinal direction of the strand with an opposite inclination.
  • the stirrers are excited in succession in such a way that a serpentine movement of the melt occurs in the longitudinal direction of the strand from top to bottom.
  • the strongest flow generated directly by the stirrer should act as high as possible on the strand, but without adversely affecting the bath level.
  • this object is achieved in that the initiated flow is directed in a direction running obliquely to the narrow side of the strand by electromagnetic forces directed differently from it.
  • the device for carrying out the method is characterized in that the longitudinal axis of at least the first coil part initiating the flow has a different direction to the longitudinal axis of at least the last coil part which runs obliquely to the adjacent narrow side of the strand.
  • the longitudinal axis of at least the first coil part in the direction of flow runs perpendicular to the adjacent narrow side of the strand.
  • the device is designed such that the longitudinal axis of at least the first coil part in the flow direction runs obliquely to the adjacent narrow side of the strand.
  • the longitudinal axes of at least the first and the last coil parts can be inclined in mirror image to the longitudinal axis of the strand. In this way, based on the longitudinal extent of the stirrer, the flow in the same half of the strand into which it is deflected, largely by stirrer force, is excited, whereby with certainty only the desired, single flow roller is created.
  • the longitudinal axes of the two coil halves form an angle of less than 120 ° in the case of a stirrer coil consisting of two halves, each composed of a plurality of coil parts.
  • angles of the oblique coil parts formed with the narrow sides of the strand can be changed. This can influence and shape the shape of the flow roller that is being formed different strand widths can be adjusted.
  • the number of white tapes can be kept at a maximum of two even with different formats, and their formation is ensured at a uniformly low intensity due to the inflow force which can be varied via the inflow angle on the narrow sides of the strand.
  • Fig. 1 the strand guide of a sheet caster for slabs is shown in a partially sectioned side view.
  • a stirring coil 2 is mounted on the inside of the strand guide behind austenitic guide rollers 3.
  • the coil 2 is acted upon by a low-frequency alternating current of 1 - 3 H z in order to generate an electromagnetic traveling field with an effective direction running at right angles transversely to the strand withdrawal direction.
  • FIG. 2 is a partially sectioned top view Section of the inside of the broadside of the strand guide of a slab caster, as shown in Fig. L, shown.
  • 10 is the slab section located in the stirring area and 3 denotes the austenitic strand guide rollers. Behind these rollers 3, a two-part, multi-phase stirring coil 12, which induces an electromagnetic traveling field in the strand, is attached to generate a flow 5 in the strand core. The direction of the traveling field is symbolized by arrows 13.
  • the stirring coil 12 is constructed from two coil parts 14 and 15, its longitudinal axis 16 running parallel to the strand surface running perpendicular to the adjacent narrow side 17 in the area of the coil part 14 and obliquely to the other narrow side 18 in the area of the coil part 15.
  • the coil part 14 is composed of two magnetic pole pairs, not shown, the coil part 15 is composed of a pole pair. These pole pairs are assigned to the two phases of a two-phase alternating current in such a way that the forces between them in the strand-inducing magnetic fields in the first coil part 14 initiate a flow 5 running from left to right, which is deflected in the area of the last, oblique coil part 15 in such a way that it flows towards the narrow side 18 at an acute angle fl. In the case of a uniform casting program, this angle ⁇ is selected to match the format in such a way that the flow 5 is certainly only directed upwards and a downward flow component is omitted. Only a single flow roller 5 is formed and hereby only a maximum of two white bands.
  • the longitudinal axis 16 of the stirring coil 12 in the area of the last coil part 15 can also be inclined downward, as can be seen in the coil part 15 ′ shown in broken lines, so that a flow extending below the coil 12 is produced.
  • This makes it possible to place the coil 12 as a whole closer to the mold, insofar as this is technically possible.
  • the strongest flow generated directly by the stirrer acts as high as possible on the strand without the bath level being undesirably influenced by an upper flow roller.
  • a reduction in the stirring intensity, given by the current intensity and / or frequency is possible, as a result of which the flow velocity and thus also the intensity of the white bands with the same metallurgical effect, i.e.
  • the coil parts 14, 15 do not have to have the proportions shown in the figure.
  • the coil part 15 can consist of two pole pairs, while the coil part 14 consists of only one pole pair.
  • Both coil parts 14 and 15 can also be constructed from a multiple of the pole pairs mentioned above. It is also possible to use a three-phase alternating current, the number of pole pairs increasing accordingly. It goes without saying that the phases of the stirring coil 12 can be electrically supplied both symmetrically and asymmetrically.
  • FIG. 3 shows another embodiment of the stirring coil 12 according to the invention, but compared to the one shown in FIG. 2, it is composed of three coil parts 14 ', 15 and 19.
  • the slab section is designated by 10
  • the austenitic rolls are designated by 3
  • the direction of the traveling field by arrows 13 and the narrow sides of the strand by 17 and 18.
  • the stirring coil longitudinal axis 16 extends in the area of the coil part 19 obliquely to the adjacent narrow side 17 and has a mirror image of the strand longitudinal axis 20 at the same angle ⁇ as the longitudinal axis in the region of the coil part 15.
  • the coil parts 15, 19 can form mutually different angles with the associated strand narrow sides 17, 18.
  • the flow in Stran g is such a Rhakspulenform, according to the arrows 13, the range suggested above the stirring coil 12, wherein the initiated flow is caused by both the spool member 16 and the coil portion 14 'and one of which her hearde below possible, a additional white band producing partial flow can be avoided.
  • the electrical parameters By suitable choice of the electrical parameters, the flow in the only remaining flow roller can be acted upon in such a way that the intensity of the white bands still being formed is greatly reduced.
  • FIG. 4 shows a stirring coil 12 similar to that shown in FIG. 3, but without a central coil part 14.
  • the stirring coil is composed of two halves 21 and 22, the longitudinal axes 23 and 24 of which form an angle / 3 which is less than 120 ° is form.
  • the two halves 21 and 22 in turn are composed of a plurality of pole pairs, not shown.
  • the flow, not shown here, is excited by the traveling field according to arrow 25 in the coil area 21 and deflected in the direction 26 by the overlapping coil part 22.
  • the device described above is advantageously used in a casting program with widely differing slab widths. Even if, as shown, the stirring coil 12 with its halves 21 and 22 protrudes beyond the narrow sides 27 and 27 'of a narrow format, the desired gentle deflection of the flow on the narrow side 27' can also be achieved here, which is the case in FIGS 3 is not the case, since here the inclined part 15 is not would work more on a much narrower slab.
  • the angles of the oblique stirrer coil parts 15, 19, 21, 22 are adjusted by means of an adjusting device 6 shown only for the coil part 15 in FIG. 3, e.g. a hydraulic cylinder, changeable.
  • an adjusting device 6 shown only for the coil part 15 in FIG. 3, e.g. a hydraulic cylinder, changeable.
  • the obliquely extending coil part 15 can be pivoted about the pivot axis 8 in the direction of the arrow 7.
  • the device according to the invention can also be used in the mold, in which case the obliquely running coil parts are advantageously directed downward in order to avoid excessive influencing of the bath level.
  • the stirring coil 12 according to the invention can also have an arcuate shape in order to achieve the desired effect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP81106112A 1980-08-11 1981-08-05 Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue Withdrawn EP0045938A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH605880 1980-08-11
CH6058/80 1980-08-11

Publications (1)

Publication Number Publication Date
EP0045938A1 true EP0045938A1 (fr) 1982-02-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106112A Withdrawn EP0045938A1 (fr) 1980-08-11 1981-08-05 Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue

Country Status (4)

Country Link
EP (1) EP0045938A1 (fr)
JP (1) JPS5752555A (fr)
BR (1) BR8105130A (fr)
ZA (1) ZA815475B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578767A1 (fr) * 1985-03-15 1986-09-19 Mitsubishi Heavy Ind Ltd Agitateur electromagnetique pour installations de moulage en regime continu
WO2010006773A1 (fr) * 2008-07-15 2010-01-21 Sms Siemag Ag Dispositif de freinage électromagnétique sur lingotières de coulée continue
WO2014155357A1 (fr) * 2013-03-28 2014-10-02 Evgeny Pavlov Procédé et appareil permettant de déplacer du métal à l'état fondu

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600879A (en) * 1984-06-15 1986-07-15 Scully John P Water moisture measuring instrument and method
JPH0255195U (fr) * 1988-10-12 1990-04-20

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH500031A (de) * 1969-12-12 1970-12-15 Aeg Elotherm Gmbh Anordnung zur Steuerung des Erstarrungsvorganges bei der Herstellung von stranggegossenen Profilen
DE2720391A1 (de) * 1976-05-21 1977-12-01 Asea Ab Anordnung beim stranggiessen
SE404585B (sv) * 1976-11-29 1978-10-16 Asea Ab Anleggning vid strenggjutning
DE2910023A1 (de) * 1978-03-21 1979-10-04 Asea Ab Verfahren und durchfuehrungsanordnung zum umruehren in aus einer kokille kommenden giesstraengen
EP0009803A1 (fr) * 1978-10-06 1980-04-16 Concast Holding Ag Procédé de coulée continue d'acier
DE3030377A1 (de) * 1979-08-23 1981-03-12 ASEA AB, Västerås Verfahren und durchfuehrungsanordnung zum umruehren des sumpfes eines aus einer stranggiessmaschine austretenden geissstranges.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH500031A (de) * 1969-12-12 1970-12-15 Aeg Elotherm Gmbh Anordnung zur Steuerung des Erstarrungsvorganges bei der Herstellung von stranggegossenen Profilen
DE2720391A1 (de) * 1976-05-21 1977-12-01 Asea Ab Anordnung beim stranggiessen
SE404585B (sv) * 1976-11-29 1978-10-16 Asea Ab Anleggning vid strenggjutning
DE2910023A1 (de) * 1978-03-21 1979-10-04 Asea Ab Verfahren und durchfuehrungsanordnung zum umruehren in aus einer kokille kommenden giesstraengen
EP0009803A1 (fr) * 1978-10-06 1980-04-16 Concast Holding Ag Procédé de coulée continue d'acier
DE3030377A1 (de) * 1979-08-23 1981-03-12 ASEA AB, Västerås Verfahren und durchfuehrungsanordnung zum umruehren des sumpfes eines aus einer stranggiessmaschine austretenden geissstranges.
GB2059834A (en) * 1979-08-23 1981-04-29 Asea Ab Electromagnetic stirring of liquid metal in continuous casting

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578767A1 (fr) * 1985-03-15 1986-09-19 Mitsubishi Heavy Ind Ltd Agitateur electromagnetique pour installations de moulage en regime continu
WO2010006773A1 (fr) * 2008-07-15 2010-01-21 Sms Siemag Ag Dispositif de freinage électromagnétique sur lingotières de coulée continue
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

Also Published As

Publication number Publication date
JPS5752555A (en) 1982-03-29
ZA815475B (en) 1982-07-28
BR8105130A (pt) 1982-04-27

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Inventor name: HAEFEKER, AXEL-INGO