US20060131795A1 - Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge - Google Patents

Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge Download PDF

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Publication number
US20060131795A1
US20060131795A1 US11/226,711 US22671105A US2006131795A1 US 20060131795 A1 US20060131795 A1 US 20060131795A1 US 22671105 A US22671105 A US 22671105A US 2006131795 A1 US2006131795 A1 US 2006131795A1
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US
United States
Prior art keywords
rmf
melt
inductor
tundish
frequency
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.)
Abandoned
Application number
US11/226,711
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English (en)
Inventor
Irving Dardik
Arkady Kapusta
Boris Mikhailovich
Ephim Golbraikh
Shaul Lesin
Herman Branover
Michael Khavkin
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.)
Energetics Technologies LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US11/226,711 priority Critical patent/US20060131795A1/en
Publication of US20060131795A1 publication Critical patent/US20060131795A1/en
Assigned to ENERGETICS TECHNOLOGIES, L.L.C. reassignment ENERGETICS TECHNOLOGIES, L.L.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DARDIK, IRVING I, GOLBRAIKH, EPHIM G, KAPUSTA, ARKADY K, MIKHAILOVICH, BORIS M, KHAVKIN, MICHAEL, BRANOVER, HERMAN D, LESIN, SHAUL L
Abandoned 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
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
    • 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
    • B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/62—Pouring-nozzles with stirring or vibrating means
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof

Definitions

  • the present invention relates generally to vortex suppression in tundishes.
  • the lowering of the free surface of a melt occurring during the discharge of the melt from a tundish or ladle of a continuous casting plant (“CCP”) may create vortices in the replacement of the tundish or ladle immediately prior to the melt. This phenomenon typically occurs when the level of the melt is lower than normal. Such a low level may occur when the tundish is in the process of being emptied, for example. Slag floating on the melt surface is drawn into the vortex and gets into the mold of the continuous casting plant. Thus, a certain part of a continuous ingot contains slag inclusions and must be cut off and remelted later on. Cutting off the slag and remelting the slag increases production costs and decreases throughput.
  • a proposed method of vortex suppression of the invention uses a rotating magnetic field (“RMF”).
  • RMF rotating magnetic field
  • This method does not involve the arrangement of any ceramic components inside the tundish and therefore is free from the above-mentioned drawbacks.
  • the parameters of RMF are easy to change and, hence, the process of vortex suppression using RMF can be easily controlled within broad limits.
  • the proposed method of vortex suppression is confirmed by the results of experiments conducted on vortex suppression by RMF performed on a low-temperature tundish model, wherein, as a melt, eutectic indium-gallium-tin alloy (InGaSn) has been used with a melting temperature of approximately 10° Celsius.
  • eutectic indium-gallium-tin alloy InGaSn
  • a method of suppressing a vortex arising in a tundish or ladle at the lowering of the free surface of a melt below a critical level using a rotating magnetic field continuously excited by m-phase current (i.e., any suitable number of current phases or m-phase voltage) in the melt above an outflow pipe, wherein the direction of RMF rotation is opposite to the direction of melt rotation in the vortex.
  • m-phase current i.e., any suitable number of current phases or m-phase voltage
  • FIG. 1 shows a vertical cross-section of a portion of a tundish adjacent to a discharge hole with an RMF inductor, in accordance with the invention
  • FIG. 2 shows a horizontal cross-section of a three-phase RMF inductor with six explicit poles, taken from line A-A of FIG. 1 ;
  • FIG. 4 shows the configuration of pole pieces of a three-phase inductor with three explicit poles, in accordance with the invention
  • FIG. 5 schematically illustrates induced current oscillations in the inductor windings, in accordance with the present invention
  • FIG. 6 shows a schematic diagram of a tundish used during experiments on vortex suppression
  • FIG. 7 shows the results of experiments conducted on the tundish of FIG. 6 .
  • a tundish cover 1 ( FIG. 1 ) inspection window 2 is made, and above this window 2 , optical probe 3 may be mounted, which records the displacement of melt surface 4 .
  • m-phase voltage may be applied to inductor 6 ( FIG. 2 ).
  • RMF is excited above discharge hole 5 , which induces a rotating system of currents in the melt.
  • Interaction of these currents with the RMF generates electromagnetic body forces (“EMBF”) that can either hinder or accelerate vortex formation above discharge hole 5 , depending on the way of switching on inductor 6 .
  • EMBF electromagnetic body forces
  • sinusoidal waveforms of current are generated in an inductor (e.g., inductor 6 ) of the type described herein such that RMF is excited above discharge hole 5 .
  • inductor 6 e.g., inductor 6
  • superwaves may be generated and applied to inductor 6 when its windings are connected to a power supply (not shown).
  • FIG. 5 schematically illustrates the formation of doubly-modulated sinusoidal current oscillations (two-level SuperWaves).
  • FIG. 5 illustrates low-frequency carrier wave 110 modulated, for example, by waves 120 and 130 . Minor waves 120 and 130 have progressively higher frequencies (compared to major wave 110 ). Other modulation levels of even higher frequency may modulate major wave 110 , but are not shown for clarity. This superwave is depicted in the time-domain in FIG. 5 .
  • the delay +t varied from 0 to 2 seconds, I o varied from 8 A to 13 A.
  • the greatest effect is observed at the maximal current in the absence of delay. It is noteworthy that in this case, maximal disturbance of the metal surface in the tundish is observed.
  • a facility realizing the proposed method constitutes explicit-pole inductor 6 ( FIGS. 1 and 2 ) with the number of poles being a multiple to the number of phases m (in the case of two-phase current, the inductor may be made with 4 (items 7 in FIG. 3 ), 8, etc. poles; in the case of three-phase current, the inductor may be made with 3 (items 8 in FIG. 4 ), 6 (items 9 in FIG. 2 ), etc. poles). These poles may be located around the outflow pipe 10 ( FIG. 1 ).
  • the magnetic circuit of inductor 6 preferably consists of ferromagnetic back 11 with explicit poles 9 , 12 ( FIG. 2 ) and coils 13 arranged on them ( FIG. 1 ). If commercial frequency currents of about 50-60 Hz are applied, the magnetic circuit may preferably be made of sheet electrotechnical steel or in the form of thin-sheet jacket 14 ( FIG. 2 ), preferably filled with iron powder 15 ( FIG. 1 ) whose particles are electrically insulated. If low-frequency currents of about 2-10 Hz are applied, the magnetic circuit may preferably be cast from steel or cast iron.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US11/226,711 2004-09-13 2005-09-13 Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge Abandoned US20060131795A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/226,711 US20060131795A1 (en) 2004-09-13 2005-09-13 Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60969704P 2004-09-13 2004-09-13
US11/226,711 US20060131795A1 (en) 2004-09-13 2005-09-13 Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge

Publications (1)

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US20060131795A1 true US20060131795A1 (en) 2006-06-22

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US11/226,711 Abandoned US20060131795A1 (en) 2004-09-13 2005-09-13 Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge

Country Status (8)

Country Link
US (1) US20060131795A1 (ja)
EP (1) EP1791665A1 (ja)
JP (1) JP2008513214A (ja)
KR (1) KR20070052343A (ja)
CN (1) CN101039768A (ja)
BR (1) BRPI0515178A (ja)
CA (1) CA2580166A1 (ja)
WO (1) WO2006031964A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2140956B1 (de) * 2008-07-04 2013-05-15 hofmann CERAMIC GmbH Eingussvorrichtung für Metallschmelzen
RU2572908C2 (ru) 2011-08-29 2016-01-20 Абб Рисёч Лтд Способ и устройство для уменьшения вихреобразования в процессе производства металла
CN117680666B (zh) * 2024-02-04 2024-04-05 湖南中科电气股份有限公司 一种通道式感应加热中间包的涡流防护系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382003A (en) * 1992-12-08 1995-01-17 Sankaranarayanan; Ramani Flow control device for the suppression of vortices

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443892A1 (fr) * 1978-12-13 1980-07-11 Siderurgie Fse Inst Rech Recipient metallurgique de coulee
JPS56154267A (en) * 1980-05-01 1981-11-28 Kawasaki Steel Corp Method for suppressing vortex of molten steel in tundish in continuous casting
JPH0428460A (ja) * 1990-05-24 1992-01-31 Kawasaki Steel Corp 溶融金属渦流の防止装置とその防止方法
JPH04224056A (ja) * 1990-12-25 1992-08-13 Kawasaki Steel Corp 連続鋳造用溶鋼保持容器
JPH09295109A (ja) * 1996-04-30 1997-11-18 Nippon Steel Corp 清浄溶湯の連続鋳造法
DE19651531C2 (de) * 1996-12-11 1999-01-14 Didier Werke Ag Verfahren zur Regelung der Temperatur und zur Vergleichmäßigung des Temperaturprofils eines schmelzenflüssigen, metallischen Stranges
DE19954452A1 (de) * 1999-11-12 2001-06-13 Elotherm Gmbh Verfahren zur Einstellung der Kraftdichte beim induktiven Rühren und Fördern sowie Induktoren zum induktiven Rühren und Fördern elektrisch leitender Flüssigkeiten
BE1014278A3 (fr) * 2001-07-05 2003-07-01 Ct Rech Metallurgiques Asbl Procede de coulee d'un lingot metallique de qualite amelioree et dispositif pour sa mise en oeuvre.
EP1578551A2 (en) * 2002-12-16 2005-09-28 Irving I. Dardik Systems and methods of electromagnetic influence on electroconducting continuum
FR2856321B1 (fr) * 2003-06-17 2006-05-26 Usinor Installation de coulee continue pour une mise en rotation electro-magnetique du metal liquide en transit dans la busette de coulee

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382003A (en) * 1992-12-08 1995-01-17 Sankaranarayanan; Ramani Flow control device for the suppression of vortices

Also Published As

Publication number Publication date
JP2008513214A (ja) 2008-05-01
CN101039768A (zh) 2007-09-19
WO2006031964A1 (en) 2006-03-23
BRPI0515178A (pt) 2008-07-08
EP1791665A1 (en) 2007-06-06
CA2580166A1 (en) 2006-03-23
KR20070052343A (ko) 2007-05-21

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Owner name: ENERGETICS TECHNOLOGIES, L.L.C., NEW JERSEY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DARDIK, IRVING I;GOLBRAIKH, EPHIM G;KAPUSTA, ARKADY K;AND OTHERS;REEL/FRAME:022374/0229;SIGNING DATES FROM 20090130 TO 20090211

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION