WO2006031964A1 - 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 PDFInfo
- Publication number
- WO2006031964A1 WO2006031964A1 PCT/US2005/032922 US2005032922W WO2006031964A1 WO 2006031964 A1 WO2006031964 A1 WO 2006031964A1 US 2005032922 W US2005032922 W US 2005032922W WO 2006031964 A1 WO2006031964 A1 WO 2006031964A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rmf
- melt
- inductor
- tundish
- frequency
- Prior art date
Links
Classifications
-
- 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.
- 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.
- 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. 3 shows the configuration of pole pieces of a two-phase inductor with four explicit poles, in accordance with the invention
- 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 0 varied from 8A to 13A. Apparently, 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.
- 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) .
- 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.
- the magnetic circuit may preferably be cast from steel or cast iron.
- Pole pieces 16 (FIG. 1) , 7 (FIG. 3) , 8 (FIG.
- the inductor may preferably be fixed to tundish jacket 17 using flange 20, which may preferably be made of nonmagnetic steel rigidly connected with the poles of the magnetic circuit .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0515178-3A BRPI0515178A (en) | 2004-09-13 | 2005-09-13 | methods and facilities for suppressing vortices arising in intermediate pans or shards during their respective discharge |
JP2007531477A JP2008513214A (en) | 2004-09-13 | 2005-09-13 | Method and equipment for suppressing vortices generated in a tundish or ladle during the respective discharge of the tundish or ladle |
CA002580166A CA2580166A1 (en) | 2004-09-13 | 2005-09-13 | Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge |
EP05795170A EP1791665A1 (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 | |
US60/609,697 | 2004-09-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006031964A1 true WO2006031964A1 (en) | 2006-03-23 |
Family
ID=35351640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/032922 WO2006031964A1 (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 (en) |
EP (1) | EP1791665A1 (en) |
JP (1) | JP2008513214A (en) |
KR (1) | KR20070052343A (en) |
CN (1) | CN101039768A (en) |
BR (1) | BRPI0515178A (en) |
CA (1) | CA2580166A1 (en) |
WO (1) | WO2006031964A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2140956A1 (en) * | 2008-07-04 | 2010-01-06 | hofmann CERAMIC GmbH | Pouring device for metal melts |
US9360255B2 (en) | 2011-08-29 | 2016-06-07 | Abb Research Ltd. | Method and arrangement for vortex reduction in a metal making process |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117680666B (en) * | 2024-02-04 | 2024-04-05 | 湖南中科电气股份有限公司 | Vortex protection system of channel type induction heating tundish |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2443892A1 (en) * | 1978-12-13 | 1980-07-11 | Siderurgie Fse Inst Rech | Metallurgical vessel contg. bottom outlet in pit - which is surrounded by electromagnetic inductor to eliminate vortex which night carry molten slag into outlet |
US5382003A (en) * | 1992-12-08 | 1995-01-17 | Sankaranarayanan; Ramani | Flow control device for the suppression of vortices |
JPH09295109A (en) * | 1996-04-30 | 1997-11-18 | Nippon Steel Corp | Method for continuously casting clean molten metal |
EP0847819A1 (en) * | 1996-12-11 | 1998-06-17 | Didier-Werke Ag | Process for the regulation the temperature and for equalizing the temperature profile of a molten metallic strand |
WO2001036130A1 (en) * | 1999-11-12 | 2001-05-25 | Elotherm Gmbh | Method for adjusting the force density during inductive stirring and the inductive discharge as well as inductors for inductive stirring and the inductive discharge of electroconductive liquids |
EP1277531A2 (en) * | 2001-07-05 | 2003-01-22 | Centre de Recherches Metallurgiques - Centrum voor de Research in de Metallurgie | Process and device for casting a metal strand |
FR2856321A1 (en) * | 2003-06-17 | 2004-12-24 | Usinor | CONTINUOUS CASTING INSTALLATION FOR ELECTRO-MAGNETIC ROTATION OF LIQUID METAL IN TRANSIT IN THE CASTING BUSH |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56154267A (en) * | 1980-05-01 | 1981-11-28 | Kawasaki Steel Corp | Method for suppressing vortex of molten steel in tundish in continuous casting |
JPH0428460A (en) * | 1990-05-24 | 1992-01-31 | Kawasaki Steel Corp | Apparatus and method for preventing molten metal vortex flow |
JPH04224056A (en) * | 1990-12-25 | 1992-08-13 | Kawasaki Steel Corp | Molten steel holding vessel for continuous casting |
AU2003301029A1 (en) * | 2002-12-16 | 2004-07-22 | Herman D. Branover | Systems and methods of electromagnetic influence on electroconducting continuum |
-
2005
- 2005-09-13 US US11/226,711 patent/US20060131795A1/en not_active Abandoned
- 2005-09-13 EP EP05795170A patent/EP1791665A1/en not_active Withdrawn
- 2005-09-13 JP JP2007531477A patent/JP2008513214A/en active Pending
- 2005-09-13 KR KR1020077008110A patent/KR20070052343A/en not_active Application Discontinuation
- 2005-09-13 BR BRPI0515178-3A patent/BRPI0515178A/en not_active IP Right Cessation
- 2005-09-13 WO PCT/US2005/032922 patent/WO2006031964A1/en active Application Filing
- 2005-09-13 CN CNA2005800347406A patent/CN101039768A/en active Pending
- 2005-09-13 CA CA002580166A patent/CA2580166A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2443892A1 (en) * | 1978-12-13 | 1980-07-11 | Siderurgie Fse Inst Rech | Metallurgical vessel contg. bottom outlet in pit - which is surrounded by electromagnetic inductor to eliminate vortex which night carry molten slag into outlet |
US5382003A (en) * | 1992-12-08 | 1995-01-17 | Sankaranarayanan; Ramani | Flow control device for the suppression of vortices |
JPH09295109A (en) * | 1996-04-30 | 1997-11-18 | Nippon Steel Corp | Method for continuously casting clean molten metal |
EP0847819A1 (en) * | 1996-12-11 | 1998-06-17 | Didier-Werke Ag | Process for the regulation the temperature and for equalizing the temperature profile of a molten metallic strand |
WO2001036130A1 (en) * | 1999-11-12 | 2001-05-25 | Elotherm Gmbh | Method for adjusting the force density during inductive stirring and the inductive discharge as well as inductors for inductive stirring and the inductive discharge of electroconductive liquids |
EP1277531A2 (en) * | 2001-07-05 | 2003-01-22 | Centre de Recherches Metallurgiques - Centrum voor de Research in de Metallurgie | Process and device for casting a metal strand |
FR2856321A1 (en) * | 2003-06-17 | 2004-12-24 | Usinor | CONTINUOUS CASTING INSTALLATION FOR ELECTRO-MAGNETIC ROTATION OF LIQUID METAL IN TRANSIT IN THE CASTING BUSH |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03 27 February 1998 (1998-02-27) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2140956A1 (en) * | 2008-07-04 | 2010-01-06 | hofmann CERAMIC GmbH | Pouring device for metal melts |
US9360255B2 (en) | 2011-08-29 | 2016-06-07 | Abb Research Ltd. | Method and arrangement for vortex reduction in a metal making process |
Also Published As
Publication number | Publication date |
---|---|
KR20070052343A (en) | 2007-05-21 |
JP2008513214A (en) | 2008-05-01 |
US20060131795A1 (en) | 2006-06-22 |
BRPI0515178A (en) | 2008-07-08 |
CN101039768A (en) | 2007-09-19 |
EP1791665A1 (en) | 2007-06-06 |
CA2580166A1 (en) | 2006-03-23 |
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