EP0059805B1 - Busette poreuse pour récipient contenant un métal fondu - Google Patents

Busette poreuse pour récipient contenant un métal fondu Download PDF

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Publication number
EP0059805B1
EP0059805B1 EP19810301019 EP81301019A EP0059805B1 EP 0059805 B1 EP0059805 B1 EP 0059805B1 EP 19810301019 EP19810301019 EP 19810301019 EP 81301019 A EP81301019 A EP 81301019A EP 0059805 B1 EP0059805 B1 EP 0059805B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
gas
porous
peripheral surface
flange portion
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.)
Expired
Application number
EP19810301019
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German (de)
English (en)
Other versions
EP0059805A1 (fr
Inventor
Junichi Ato
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Individual
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Individual
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8188235&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0059805(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to DE8181301019T priority Critical patent/DE3168852D1/de
Priority to EP19810301019 priority patent/EP0059805B1/fr
Publication of EP0059805A1 publication Critical patent/EP0059805A1/fr
Application granted granted Critical
Publication of EP0059805B1 publication Critical patent/EP0059805B1/fr
Expired 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • This invention relates to an improvement in a porous nozzle which is adapted to be arranged at the bottom of a molten metal vessel.
  • the object of this is to separate by flotation, the non-metallic inclusions in molten metal in said vessel and to prevent slag involvement and nozzle opening closure. More particularly it relates to an improvement of a porous nozzle mounted at the bottom of a ladle or tundish of the molten metal vessel.
  • nozzle of a ladle or tundish container is constructed of a dense refractory.
  • nonmetallic inclusions in the molten steel often adhere in the nozzle opening during let down of the melt to cause contraction of the nozzle aperture and eventually closure, this often brings about difficulties in pouring the melt.
  • a refractory porous plug is arranged at the bottom of a container such as ladle or tundish, and inert gases are jetted into the molten steel through the pores of the porous plug.
  • the non-metallic inclusions are flotated and separated and the purity of said molten steel is improved.
  • a refractory weir is provided within said vessel to change the flow of the molten steel, and the non-metallic inclusions in the molten steel are separated by flotation.
  • the tundish are limited because of structure and design of a continuous casting plant, however, it is difficult to make an effective weir shape or arrange an effective weir within a comparatively narrow tundish, and it is known that not only the tundish design becomes complicated but also it is difficult to fix a weir within the tundish at all.
  • porous nozzle arranged in a conventional tundish prevents contraction and closure of the nozzle, during continuous casting said nozzle may cause entrainment of the non-metallic inclusions, slag, etc. which then float up on the turbulence generated at the upper portion of the nozzle opening when the ladle is replaced, thereby causing a lowered quality of steel.
  • the plug must be arranged at a position different from that of the nozzle so that a complete effect cannot be exhibited, particularly for preventing slag involvement, due to the turbulence generated at the upper portion of the nozzle opening when replacing the ladle as referred to above.
  • the invention provides, in one aspect, that the flanged portion and the frusto-conical or cylindrical portion of the nozzle are formed with a gas seal member therebetween, and a gas pool in communication respectively with each of said portions.
  • a fine porous refractory layer is interposed between said nozzle portions, said layer being formed of a finer material than the nozzle body; and wherein the gas pool communicates directly with the flange portion, a portion only of said gas being able to pass through the said layer.
  • the porous nozzle is formed as a single body including a flange portion arranged superior to the frusto-conical or cylindrical portion, and wherein the gas pool is formed over at least part of the outer peripheral surface of the flange portion, a gas vent in communication with said gas pool being disposed inferior to said flange portion and in the outer peripheral surface of the cylindrical or frusto-conical portion.
  • a porous nozzle is arranged at the pouring-out portion at the bottom of a molten steel vessel, and is mounted in a nozzle socket in a central portion of a nozzle-receiving brick.
  • the outer peripheral surface of said brick is in contact with a lining refractory brick of said vessel bottom.
  • This embodiment of the invention provides an excellent porous nozzle in which the vessel is surrounded with a steel shell 3 in such a manner that an annular gas pool 2 is provided over at least a part, or the whole of the outer peripheral surface of a porous refractory layer constituting the main body of a porous nozzle 1, and at least over a part, or the whole, of the flange portion at the lower end of a flange porous layer 1 a.
  • the gas pool 2 communicates with a vent 2a in the outer peripheral surface of the cylindrical nozzle portion.
  • Inert gas is jetted through a piping from the outside into a nozzle opening 11a from the upper surface of said porous refractory layer 1 a constituting the flange portion of the porous nozzle and from the inner periphery surface of a porous refractory layer 1b constituting the nozzle cylindrical portion.
  • FIG 2 shows an embodiment of a pourous nozzle where the porous refractory layer of Figure 1 is doubled. That is, this porous nozzle is formed such that the porous refractory layer 1 a is isolated by a sealing member 5 from the porous refractory layer 1 b constituting a frusto- conical portion whereby the function of causing the inert gases to jet upwardly in the molten steel is separated from the function of jetting said gases into the nozzle opening 11 a.
  • the present porous nozzle has in one unit means for jetting gases to the upper surface of the flange by permeating the pores of the flange porous refractory layer.
  • gas blowing opening 4 into gas pool 2 which is provided at the circumference of the lower end of the flange of said porous nozzle.
  • the nozzle also provides means for jetting the gases into the nozzle opening 1 a, by permeating the pores of the porous refractory layer 1 b of the frust-conical nozzle portion via gas pool 2a surrounded by a steel shell 3.
  • a sealing member 5 separates said two means, and may be made of silica, alumina or any other desired sintered refractory which completely prevents gas leakage.
  • a sealing member 5 separates said two means, and may be made of silica, alumina or any other desired sintered refactory which completely prevents gas leakage.
  • gas leakage to the outside is prevented and gas permeation is prevented between the refractory porous layer of the flange portion 1 a and the porous refractory layer 1b of the frusto-conical nozzle portion by means of said sealing member 5.
  • the reason for separating the gas ejection mechanism in the upper flange portion from that in the nozzle opening 1 a a is that in a porous nozzle for a tundish, owing to the physical pressure difference between the molten steel static pressure within the tundish, which is received by the upper surface of the flange, and the molten steel kinetic pressure (pressure is reduced based on the- Bernoulli's theorem) which is received by the inner peripheral surface of the nozzle during the time when the molten steel flows down within said nozzle opening, it is necessary to separately adjust the gas blowing pressure in the flange portion from that into the nozzle opening 11 a.
  • the pressure of the gas blown into the nozzle opening 1 a makes it possible to prevent the nozzle from contraction and closure by forming a gas curtain in the inner peripheral surface of the nozzle opening.
  • gas pressure is unnecessarily raised the inert gases pass into the molten steel when the melt flows down into the nozzle opening, and therefore there is an unfavourable possibility that pin holes may occur in the solidifying process of the molten steel.
  • the present invention has advantages in that when the lower portion of said porous nozzle is closed to metal passage it suffices to eject gas only from the upper surface of the flange because of the plurality of gas openings therein. Thus, if necessary, gas ejection and gas pressure may be easily adjusted so as to save inert gas.
  • the porous refractory layer of the main body of said porous nozzle is constructed in such a way that between the porous refractory layer of the flange portion and that of the frusto-conical portion there is formed a fine porous refractory layer 6 which has a greater gas resistance than the porous refractory layer of the main porous body.
  • Inert gas is therefore primarily guided from the gas inlet 4 and the gases are jetted, via the gas pool 2, from the upper surface of the flange portion permeating the pores of the porous refractory layer 1 a.
  • the fine porous refractory layer is not flat in its sectional configuration but it may be of optional shape, and naturally the thickness of said layer is optionally selected and said layer is formed in a shape and thickness answering particular conditions depending upon the permeation and resistance of the gas.
  • FIG. 4 is a schematical sectional view of the porous nozzle of Figure 2, in which the porous nozzle wherein the ejection mechanism from the flange surface is separated from that into the nozzle opening, is arranged at the bottom of a molten metal vessel. Further, Fig. 4 is also a sectional view of the porous nozzle 1 as arranged, in which a through hole is provided at the bottom of a vessel where a steel casing 7 is lined with refractory bricks 8, said porous nozzle being mounted in a central zone of the inner peripheral surface of the nozzle-receiving brick 9 fixed in said through hole.
  • Fig. 4 is exemplified with a porous nozzle connected at its lower end to a sliding nozzle 10, but said nozzle can naturally be applicable to melt discharging nozzles which adopt a stopper system as a nozzle opening and closing mechanism.
  • porous nozzle of the invention increases its width within an operable range in the length and in the width direction of the flange, the more it produces its beneficial effects.
  • shape and capacity of the melt vessel and the problems of said vessel when operating must be taken into consideration to find the optimum width and thickness of the flange.
  • the upper surface of the flange is shown in a flat configuration, but the shape is not limited to said configuration and no troubles in use even if the surface is curved or a little uneven.
  • porous nozzle ejects an inert gas toward the upper portion of the molten metal.
  • the porous nozzle of the invention has been described in detail particularly with respect to a tundish nozzle for molten steel, but the present invention is very useful industrially in that it is applicable to vessels for other molten metals such as copper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (4)

1. Buse poreuse réfractaire propre à être disposée dans le fond d'un récipient contenant du métal en fusion dans laquelle: la buse poreuse (1) comprend une partie bridée (1a) le une partie tronconique ou cylindrique (1b), la surface périphérique externe du corps principal de la buse proeuse est enfermée dans une enveloppe étanche au gaz (3), un distributeur de gaz (2) est prévu entre la surface inférieure de la partie bridée et la surface périphérique de la partie tronconique ou cylindrique ainsi que la surface périphérique interne de l'enveloppe, et le distributeur de gaz communique avec une conduite d'alimentation de gaz inerte (4) caractérisée en ce que la partie bridée (1a) et la partie tronconique ou cylindrique (1b) de la buse sont séparées par un élément d'étanchéité au gaz (5) et un distributeur de gaz (2, 2a) communique respectivement avec chacune des parties (1 a, ib).
2. Buse poreuse réfractaire propre à être disposée dans le fond d'un récipient contenant du métal en fusion, dans laquelle la buse poreuse (1) comprend une partie bridée (1a) et une partie tronconique ou cylindrique (1b), la surface périphérique externe du corps principal de la buse poreuse est enfermée dans une enveloppe étanche au gaz (3).et un distributeur de gaz (2) est prévu entre la surface inférieure de la partie bridée et la surface périphérique extérieure de la partie tronconique ou cylindrique ainsi que la surface périphérique interne de l'enveloppe et le distributeur de gaz communique avec une conduit d'alimentation de gaz inerte (4), caractérisée en ce qu'une fine couche réfractaire poreuse (6) est intercalée entre les parties (la) et (1b) de la buse, la couche (6) étant faite d'une matière plus fine que celle du corps de la buse et le distributeur de gaz communique directement avec la partie bridée (1a), une fraction seulement du gaz étant à même de traverser la couche (6).
3. Buse poreuse réfractaire propre à être disposée dans le fond d'un récipient contenant du métal en fusion, dans laquelle la buse poreuse (1) comprend une partie bridée (1a) et un partie tronconique ou cylindrique (1b), la surface périphérique externe du corps principal de la buse poreuse est enfermée dans une enveloppe étanche au gaz (3), un distributeur de gaz (2) est prévu entre la surface inférieure de la partie bridée et la surface périphérique extérieure de la partie tronconique ou cylindrique ainsi que la surface périphérique interne de l'enveloppe et le distributeur de gaz communique avec une conduit d'alimentation de gaz inerte (4), caractérisée en ce que la buse poreuse (1) a la forme d'un corps unique comprenant une partie bridée (1a) disposée en service au-dessus de la partie tronconique ou cylindrique (1b), et le distributeur de gaz (2) est formée sur au moins une partie de la surface périphérique externe de la partie bridée (1 a), un évent (2a) en communication avec le distributeur de gaz (2) étant prévu à l'intérieur de la partie bridée (1a) et dans la surface périphérique extérieure de la partie cylindrique tronconique (1b).
4. Récipient de métal en fusion, caractérisé en ce.qu'il comprend une buse poreuse réfractaire suivant la revendication 1, 2 ou 3.
EP19810301019 1981-03-11 1981-03-11 Busette poreuse pour récipient contenant un métal fondu Expired EP0059805B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8181301019T DE3168852D1 (en) 1981-03-11 1981-03-11 Porous nozzle for molten metal vessel
EP19810301019 EP0059805B1 (fr) 1981-03-11 1981-03-11 Busette poreuse pour récipient contenant un métal fondu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810301019 EP0059805B1 (fr) 1981-03-11 1981-03-11 Busette poreuse pour récipient contenant un métal fondu

Publications (2)

Publication Number Publication Date
EP0059805A1 EP0059805A1 (fr) 1982-09-15
EP0059805B1 true EP0059805B1 (fr) 1985-02-13

Family

ID=8188235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810301019 Expired EP0059805B1 (fr) 1981-03-11 1981-03-11 Busette poreuse pour récipient contenant un métal fondu

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EP (1) EP0059805B1 (fr)
DE (1) DE3168852D1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311617C1 (de) * 1983-03-30 1984-10-25 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren und Einrichtung zum Spuelen einer Metallschmelze,insbesondere von Stahl,in einer Giesspfanne
GB8313074D0 (en) * 1983-05-12 1983-06-15 Thornton J M Refractory product
DE3339586A1 (de) * 1983-11-02 1985-05-23 Didier-Werke Ag, 6200 Wiesbaden Eintauchausguss
CH657075A5 (de) * 1984-11-26 1986-08-15 Cometus Ag Verfahren zum spuelen von metallschmelzen, mit einem durch einen spuelstein gefuehrten gas, und spuelstein zur ausfuehrung des verfahrens.
DE3512907A1 (de) * 1985-04-11 1986-10-16 Stopinc Ag, Baar Ausgusshuelse fuer einen metalschmelze enthaltenden behaelter
US4756452A (en) * 1986-11-13 1988-07-12 Shinagawa Refractories Co., Ltd. Molten metal pouring nozzle
ATE107878T1 (de) * 1987-09-07 1994-07-15 Danieli Off Mecc Giessverfahren für eine stranggiessvorrichtung mit reduzierter bauhöhe und entsprechender tauchausguss.
FR2627715B1 (fr) * 1988-02-26 1991-10-11 Vesuvius Sa Busette de coulee pour ouverture assistee, dispositif l'incorporant et procede de mise en oeuvre
FR2681270A3 (en) * 1991-09-18 1993-03-19 Irsid Nozzle for the continuous casting of liquid metal, particularly steel
CH684937A5 (de) * 1991-11-19 1995-02-15 Stopinc Ag Verschlussplatte für einen Schiebeverschluss an einem Metallschmelze enthaltenden Behälter.
WO2002047846A2 (fr) * 2000-12-11 2002-06-20 Vesuvius Crucible Company Buse divisee mecaniquement
AT517239B1 (de) * 2015-05-28 2019-07-15 Sheffield Hi Tech Refractories Germany Gmbh Stopfen in einem Zusammenwirken mit einer Bodenausgussdüse in einem metallurgischen Gefäß
JP2021049564A (ja) * 2019-09-26 2021-04-01 黒崎播磨株式会社 タンディッシュ上ノズル構造体及び連続鋳造方法
CA3232437A1 (fr) * 2021-09-24 2023-03-30 Arcelormittal Buse de panier de coulee superieure etanche aux fuites

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB834234A (en) * 1955-09-19 1960-05-04 Patentverwertung Ag Process and device for the production of high-quality castings
US3773226A (en) * 1970-04-23 1973-11-20 Didier Werke Ag Container with sliding shutter for a liquid melt
IT974028B (it) * 1971-12-29 1974-06-20 Stoecker U Kunz Gmbh Perfezionamento nelle disposizioni di bocca di colata per recipienti contenenti metalli fusi
FR2167284A1 (en) * 1972-01-12 1973-08-24 Siderurgie Fse Inst Rech Avoiding casting hole blockages - by passing an oxidising agent through the casting hole wall
GB1598764A (en) * 1977-03-18 1981-09-23 Sumitomo Metal Ind Method and apparatus for continuous casting of steel

Also Published As

Publication number Publication date
EP0059805A1 (fr) 1982-09-15
DE3168852D1 (en) 1985-03-28

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