EP2355946A1 - Immersion nozzle - Google Patents
Immersion nozzleInfo
- Publication number
- EP2355946A1 EP2355946A1 EP09744083A EP09744083A EP2355946A1 EP 2355946 A1 EP2355946 A1 EP 2355946A1 EP 09744083 A EP09744083 A EP 09744083A EP 09744083 A EP09744083 A EP 09744083A EP 2355946 A1 EP2355946 A1 EP 2355946A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- immersion nozzle
- gas bubbles
- molten metal
- tubular body
- 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
Links
- 238000007654 immersion Methods 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 238000009749 continuous casting Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 56
- 239000000155 melt Substances 0.000 description 33
- 239000002893 slag Substances 0.000 description 7
- 230000009189 diving Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
Definitions
- the invention relates to a diving spout, as used for example in the continuous casting of a molten metal.
- the immersion nozzle comprises a tubular body and a pouring passage extending from a first end portion of the tubular body at which a molten metal enters the pouring passage to a second end portion at which the molten metal leaves the pouring passage via at least one exit port. It can be seen from the document that immersion nozzles with two diametrically opposite lateral outlet openings also belong to the state of the art, so that the melt is laterally deflected from an initially purely vertical flow direction in two directions before it emerges from the immersion tube.
- a disadvantage of this process technology is that partly gas bubbles of considerable size arise and are conducted with the melt stream into the metallurgical melt pool.
- Such gas bubbles can have a diameter of several millimeters, but in some cases also diameters in the centimeter range.
- the pouring mirror (the surface of the molten bath) may vary, especially in the border region to the dip tube
- ascending gas bubbles can break up a slag layer resting on the molten bath and / or a casting powder layer. This can lead to undesirable contact of the melt with ambient air. Also, foundry slag can be drawn into the melt.
- the described formation of gas bubbles, even larger gas bubbles, can not be prevented in principle, on the contrary: it is metallurgically necessary for certain applications.
- the inventive concept is to make the existing gas bubbles harmless as possible.
- the invention is based on the consideration to provide a way to remove the gas bubbles from the melt stream before the molten metal is passed from the dip tube into a molten bath of a metallurgical melting vessel.
- the invention makes use of the fact that gas bubbles rise (float) within a molten metal.
- the tendency of the gas bubbles to rise is greater, the larger the gas bubbles are and the lower the viscosity of the molten metal. This means that in particular the unwanted large gas bubbles with a diameter of »1 mm can be removed from the melt more easily than small gas bubbles.
- the concrete concept of the invention consists in providing a chamber from the dip tube immediately before leaving the melt, into which such gas bubbles can rise (escape).
- the chamber acts as a collecting container or buffer vessel for the said gas bubbles before they enter the molten bath (in the mold).
- Further considerations of the inventions go to either return this gas / gas bubbles in the melt stream within the dip tube, in such a way that when the gas bubbles are introduced into the melt stream, the gas bubbles are crushed and thus rendered largely harmless, or in an alternative embodiment remove the gas from the system, ie into the ambient atmosphere.
- the invention accordingly relates to a submersible nozzle with the following features:
- 1.2 a pouring passage extending from a first end portion of the tubular body at which a molten metal enters the pouring passage to a second end portion at which the molten metal leaves the pouring passage via at least one exit port
- a diving nozzle with the features 1.1 and 1.2 belongs to the prior art, which is now optimized by the structural design according to feature 1.3.
- EP 1 036 613 B l is known, the melt in the pouring passage initially runs vertically from top to bottom, before they split and under a Angle of approximately 60 ° is led away from the immersion nozzle by two diametrically opposite lateral outlet openings.
- the invention now provides, at the second end portion of the immersion nozzle to provide a chamber which is in fluid communication with the pouring channel, so that gas bubbles, which are carried along with the melt stream, can rise from the melt stream into the chamber and so from the part of the melt are removed, which flows into the metallurgical melting vessel or in its molten bath.
- the chamber may extend from a portion of the pouring channel along which the molten metal flows at an angle> 0 and ⁇ 90 ° to the axial direction of the tubular body. If the flow conditions in the metallurgical vessel allow it, the angle can also be> 90 °, which enhances the tendency of gas bubble deposition.
- the chamber can connect substantially radially outside to the pouring channel, so that the boundary wall of the pouring channel forms an inner wall of the chamber.
- the collecting space for the gas may also run in an annular manner around the pouring channel or be spaced apart from one another by a plurality of chambers.
- each chamber being associated with one of two melt streams at the outlet end.
- the invention further provides to form the chamber at a distance from the first connection region with the pouring channel having at least one second connection region (an opening) to the pouring channel, so that the chamber receives a type of bypass function.
- Gas bubbles which at the bottom of the chamber (viewed in the main flow direction of the melt) have risen up into the chamber, so at the upper end of the chamber, which is the end of the chamber, which faces the first end portion of the pouring channel again be returned to the pouring channel and thus into the melt stream. It has been found that when recycling the relatively large gas bubbles in the melt stream it comes to a crushing of the gas bubbles to a largely innocuous measure.
- the gas is not removed from the system; but the gas bubbles are crushed and indeed to such a degree that they no longer cause the problems mentioned even after entering the molten bath in the metallurgical vessel. Rather, then the crushed gas bubbles can rise slowly, without turbulence and without destruction of slag and G manpulver Anlagen.
- the chamber at a distance from its lower end, that is offset in the direction of the first end portion of the immersion nozzle, having an opening which creates a connection to the ambient atmosphere with a proper use of the immersion nozzle.
- the pouring channel itself and its course, in particular in the second end section, towards the outlet opening or the outlet openings can be designed according to the prior art. It is advantageous if the pouring channel in the second section is designed so that the molten metal flows out of the outlet opening at an angle of> 0 and ⁇ 90 ° to the axial direction of the tubular body, because this calms the melt stream and the gas bubbles can still rise sufficiently upwards ,
- Said flow angle can be limited to> 45 ° and ⁇ 75 ° according to another embodiment.
- the immersion nozzle can be produced by conventional process techniques and using refractory materials, for example as cast or pressed part from an offset based on Al 2 O 3 , TiO 2 , ZrO 2 , MgO, CaO, etc.
- the size of the chamber depends on the particular application.
- the transition region (opening area) between the pouring channel and the chamber will have a cross-sectional area of 7-30 cm 2 and the chamber as a whole a volume of, for example, 50-250 cm 3 , starting from an immersion nozzle having a length of 900 mm and an outer diameter of 120 mm , a diameter of the pouring channel of 70 mm and a cross-sectional area of the outlet opening / s of about 50 cm 2 .
- FIGS. 1 and 2 each show in schematic representation an outflow-side (second) end of a diving spout according to the invention, on the left in FIG. 1, while the prior art is compared on the right.
- Figure 1 shows a submersible nozzle with a tubular body 10, a pouring channel 12 which extends substantially concentric to the axial center longitudinal axis L of the tubular body, from a first end portion 14 of the tubular body, in which a molten metal enters the pouring channel, to to a second End section 16, at which the molten metal leaves the pouring channel 12 via two lateral outlet openings 18.1, 18.2.
- the pouring channel 12 in the region of the second end section 16 is designed such that the molten metal changes its originally purely vertical flow direction (arrow V) and the melt stream changes into two partial streams (arrows T 1, T 2) which are initially at an angle ⁇ of approximately 50 ° to the flow direction V in the direction of the outlet openings 18.1, 18.2.
- these gas bubbles may have a different size. Schematically, this is indicated in the right part of Figure 1 by the arrows A, B and C, where C indicates a typical flow direction of large gas bubbles, B is a typical flow direction for gas bubbles medium size and A indicates the direction in which the smallest gas bubbles in the molten bath S be guided.
- C indicates a typical flow direction of large gas bubbles
- B is a typical flow direction for gas bubbles medium size
- A indicates the direction in which the smallest gas bubbles in the molten bath S be guided.
- the larger gas bubbles in particular those with a diameter of more than 1 mm, rise upwards in the molten bath S and cause the abovementioned metallurgical problems.
- these larger gas bubbles can break up a scarfing layer 26 resting on the melt bath and / or a cast powder layer, as is also indicated schematically in the right-hand part of FIG.
- a diving nozzle according to the invention differs by the geometry shown on the left in FIG. 1:
- the dip tube is extended at opposite areas of the lower end portion 16 to the outside in each case by a chamber 20 which is bounded by an upper wall surface 20 o, a subsequent, outer and lateral, parallel to the body 10 extending wall surface 20 s and a part of the body 10 and down (towards the face plate 15) is open.
- a chamber 20 which is bounded by an upper wall surface 20 o, a subsequent, outer and lateral, parallel to the body 10 extending wall surface 20 s and a part of the body 10 and down (towards the face plate 15) is open.
- an opening 21 is arranged in the body 10, which creates a fluidic connection between the interior of the body 10 (which is the pouring channel 12) and the chamber 20.
- the embodiment of Figure 2 differs from the embodiment of Figure 1 in that instead of the opening (s) 21 between the / the chamber (s) 20 and pouring channel 12 in the upper wall portion 2Oo of the chambers 20 gas outlet openings 23 are arranged through which the Gas bubbles can escape into the ambient atmosphere U, as also schematically indicated by circles.
- the dimensioning of the immersion nozzle according to the embodiment of Figure 2 is such that the upper boundary wall 2Oo each chamber 20 above the molten bath S or the corresponding slag or G confusepulver Anlagen 26 runs so that the gas bubbles discharged through the gas outlet 23 can escape directly into the ambient atmosphere.
- An immersion nozzle according to the invention includes the following features:
- the G mankanalquerites corresponds to the inner cross section of the tubular body.
- a tubular body in the form of a round cylinder in the section between the first and second end parts) cut
- the deflection region for the melt at the outlet-side second end portion of the tubular body is an integral part of the dip tube.
- the chamber volume and the inner volume of the entire immersion tube do not change in use (apart from erosion phenomena).
- the dip tube is designed so that the vertically flowing from top to bottom melt at the second end portion is divided into at least two spaced apart streams, each associated with a chamber, viewed in the direction of flow of the melt, respectively before the area lies / lie where the melt stream or part of it leaves the dip tube.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Furnace Charging Or Discharging (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008058647A DE102008058647A1 (en) | 2008-11-22 | 2008-11-22 | submerged nozzle |
PCT/EP2009/007731 WO2010057566A1 (en) | 2008-11-22 | 2009-10-29 | Immersion nozzle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2355946A1 true EP2355946A1 (en) | 2011-08-17 |
EP2355946B1 EP2355946B1 (en) | 2013-11-20 |
Family
ID=41350663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09744083.8A Not-in-force EP2355946B1 (en) | 2008-11-22 | 2009-10-29 | Immersion nozzle |
Country Status (10)
Country | Link |
---|---|
US (1) | US8517231B2 (en) |
EP (1) | EP2355946B1 (en) |
CN (1) | CN102239019B (en) |
BR (1) | BRPI0920957A2 (en) |
CA (1) | CA2743224C (en) |
DE (1) | DE102008058647A1 (en) |
MX (1) | MX2011005327A (en) |
RU (1) | RU2476292C2 (en) |
TW (1) | TW201021943A (en) |
WO (1) | WO2010057566A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2815820B9 (en) * | 2013-06-20 | 2017-03-01 | Refractory Intellectual Property GmbH & Co. KG | Refractory submerged entry nozzle |
CN105705268A (en) * | 2013-11-07 | 2016-06-22 | 维苏威坩埚公司 | Nozzle for casting metal beams |
CN107552765B (en) * | 2017-08-11 | 2020-07-28 | 徐州东力锻压机械有限公司 | Be used for as cast stalk |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3349838A (en) | 1965-06-04 | 1967-10-31 | American Smelting Refining | Float control valve for continuous casting |
DE1959097C2 (en) * | 1969-11-20 | 1973-10-04 | Mannesmann Ag, 4000 Duesseldorf | Device in continuous casting for distributing eggs molten steel |
FR2227728A5 (en) * | 1973-04-26 | 1974-11-22 | Monoplast | Intermittent liquid pouring spout - has cup facing inlet nozzle inside peripheral skirt forming annular outlet |
US4487251A (en) * | 1982-03-08 | 1984-12-11 | Vesuvius Crucible Company | Continuous casting apparatus and a method of using the same |
JPH07227B2 (en) * | 1985-08-29 | 1995-01-11 | 黒崎窯業株式会社 | Immersion nozzle and manufacturing method thereof |
DE4317620C1 (en) * | 1993-02-08 | 1994-08-11 | Max Planck Inst Eisenforschung | Process for separating non-metallic inclusions from liquid metals and ceramic chamber therefor |
DE4320723A1 (en) * | 1993-06-23 | 1995-01-05 | Didier Werke Ag | Immersion spout |
AUPN770296A0 (en) * | 1996-01-24 | 1996-02-15 | Bhp Steel (Jla) Pty Limited | Strip casting |
DE19722890A1 (en) * | 1997-05-28 | 1998-12-03 | Mannesmann Ag | Diving spout |
JP3519013B2 (en) | 1999-03-17 | 2004-04-12 | アルプス電気株式会社 | Rotating connector |
GB9906116D0 (en) | 1999-03-17 | 1999-05-12 | Didier Werke Ag | Refractory product |
IT1317137B1 (en) * | 2000-03-08 | 2003-05-27 | Danieli Off Mecc | PERFECTED UNLOADER FOR CONTINUOUS CASTING |
JP2003266155A (en) * | 2002-03-12 | 2003-09-24 | Nippon Steel Corp | Method for continuously casting molten steel and immersion nozzle used for the continuous casting |
RU2236326C2 (en) * | 2002-11-04 | 2004-09-20 | Хлопонин Виктор Николаевич | Method for continuous casting of steel from intermediate ladle to mold and submersible nozzle for performing the same |
-
2008
- 2008-11-22 DE DE102008058647A patent/DE102008058647A1/en not_active Withdrawn
-
2009
- 2009-10-29 US US13/129,549 patent/US8517231B2/en not_active Expired - Fee Related
- 2009-10-29 CN CN200980147093.8A patent/CN102239019B/en not_active Expired - Fee Related
- 2009-10-29 BR BRPI0920957A patent/BRPI0920957A2/en not_active IP Right Cessation
- 2009-10-29 CA CA2743224A patent/CA2743224C/en not_active Expired - Fee Related
- 2009-10-29 RU RU2011120043/02A patent/RU2476292C2/en not_active IP Right Cessation
- 2009-10-29 WO PCT/EP2009/007731 patent/WO2010057566A1/en active Application Filing
- 2009-10-29 EP EP09744083.8A patent/EP2355946B1/en not_active Not-in-force
- 2009-10-29 MX MX2011005327A patent/MX2011005327A/en active IP Right Grant
- 2009-11-20 TW TW098139486A patent/TW201021943A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2010057566A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2355946B1 (en) | 2013-11-20 |
RU2011120043A (en) | 2012-11-27 |
US20110233237A1 (en) | 2011-09-29 |
BRPI0920957A2 (en) | 2015-12-29 |
WO2010057566A1 (en) | 2010-05-27 |
DE102008058647A1 (en) | 2010-06-10 |
US8517231B2 (en) | 2013-08-27 |
TW201021943A (en) | 2010-06-16 |
CA2743224C (en) | 2014-03-18 |
RU2476292C2 (en) | 2013-02-27 |
MX2011005327A (en) | 2011-06-24 |
CA2743224A1 (en) | 2010-05-27 |
CN102239019A (en) | 2011-11-09 |
CN102239019B (en) | 2014-04-16 |
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