EP0066492A1 - Verfahren zum Herstellen eines Giessrohres - Google Patents

Verfahren zum Herstellen eines Giessrohres Download PDF

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Publication number
EP0066492A1
EP0066492A1 EP82400890A EP82400890A EP0066492A1 EP 0066492 A1 EP0066492 A1 EP 0066492A1 EP 82400890 A EP82400890 A EP 82400890A EP 82400890 A EP82400890 A EP 82400890A EP 0066492 A1 EP0066492 A1 EP 0066492A1
Authority
EP
European Patent Office
Prior art keywords
tube
binder
refractory
pouring
container
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
Application number
EP82400890A
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English (en)
French (fr)
Other versions
EP0066492B1 (de
Inventor
Jean-Charles Daussan
Gérard Daussan
André Daussan
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.)
Daussan SAS
Original Assignee
Daussan SAS
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9258932&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0066492(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Daussan SAS filed Critical Daussan SAS
Priority to AT82400890T priority Critical patent/ATE14850T1/de
Publication of EP0066492A1 publication Critical patent/EP0066492A1/de
Application granted granted Critical
Publication of EP0066492B1 publication Critical patent/EP0066492B1/de
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
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • the present invention relates to a pouring tube intended to be placed under the pouring orifice of a metallurgical container, (such as a ladle) and to be immersed in the bath of molten metal which is poured into a second container.
  • metallurgical such as a tundish placed under the aforementioned ladle.
  • the invention also relates to the method of manufacturing such a pouring tube.
  • a pouring tube made of thermally insulating material and of low density constituted by a mixture of refractory particles such as silica, alumina or magnesia and mineral fibers such as glass wool or rock wool or organic fibers, coated in an organic binder (for example phenolic resin) or inorganic (refractory cement or silicate).
  • refractory particles such as silica, alumina or magnesia and mineral fibers such as glass wool or rock wool or organic fibers
  • an organic binder for example phenolic resin
  • the latter is formed around a perforated sleeve, from a pasty and aqueous mixture comprising the aforementioned constituents and the excess water contained in this mixture is sucked out from inside the perforated sleeve. cited above.
  • the tube reinforced externally by a metal frame is then carried in an oven to evaporate the residual water and harden the binder.
  • the tube When in use, the tube is engaged in a substantially leaktight manner around the pouring nozzle of the upper container (ladle).
  • Such a tube has excellent thermal insulation power and therefore prevents the cooling of the liquid metal which is poured from the ladle into the tundish.
  • such tubes resist the temperature of the liquid metal (steel or liquid iron) which is poured inside this tube.
  • This resistance is explained by the sintering of the inorganic particles which this tube contains and which makes it possible to ensure the cohesion of the latter after decomposition. or disintegration of the binder. Without this sintering, the tube would fall to dust after decomposition of the organic binder or disintegration of the inorganic binder.
  • the lower part of the pouring tube which plunges into the molten metal bath contained in the lower container tends to wear out quickly by melting and / or chemical attack by the products which cover the surface of the molten metal. cited above.
  • the object of the present invention is to remedy this drawback by creating a pouring tube which is simple to use and has excellent mechanical and thermal resistance, although it does not have refractory rings at its ends.
  • the pouring tube targeted by the invention consists of a mixture of refractory particles and fibers coated in a binder which does not withstand the temperature at which is carried the tube during the passage of the liquid metal therein, the refractory particles being sinterable in an area of the tube directly exposed to the heat of the liquid metal.
  • this tube is characterized in that it also contains, at least in the zone which is not directly exposed to the heat of the liquid metal, a refractory binder resistant to this heat.
  • This refractory binder thus ensures the cohesion and the mechanical resistance of the zone of the tube which is not directly exposed to heat and which is consequently not sinterable.
  • the refractory binder is present only at the ends of the tube.
  • the upper end of the tube which is in contact with the pouring nozzle is reinforced by the refractory binder and therefore resists the wear and tear generated during handling of the tube.
  • the lower end resists, thanks to the presence of the refractory binder, the direct action of the liquid metal in which it plunges.
  • the process targeted by the invention for manufacturing a pouring tube comprises the steps consisting in forming the tube around a perforated sleeve from a pasty and aqueous mixture of refractory particles, fibers and an organic binder and / or inorganic, to suction the excess water from the mixture inside the perforated sleeve, then to carry the tube in an oven to evaporate the residual water and harden the mixture.
  • this process is characterized in that after or during the water suction step, the end of the tube intended to be placed near the pouring orifice of the first is penetrated metallurgical container and / or in the end of the tube intended to immerse in the molten metal poured into the second container, an aqueous solution of a binder having, after hardening, properties refractory superior to those of the basic organic and / or inorganic binder which is contained in the whole of the tube.
  • a proportion of water equal to about 30 to 40% by weight of the mixture is extracted from the pasty and aqueous mixture. Therefore, the material has the property of being able to re-absorb water. This is what allows the aqueous binder solution to penetrate inside the material at the ends of the tube.
  • the water from this binder as well as the residual water contained in the whole of the tube is evaporated and this hardened binder as well as the basic organic and / or inorganic binder which is contained in the whole. of the tube.
  • the binder introduced into the ends of the tube has, after hardening, refractory properties greater than that of the base binder, the thermal and mechanical resistance of the end of the tube adjacent to the pouring orifice which is not subjected to is improved. sintering mentioned above, as well as that of the end of the tube which plunges into the liquid metal which is poured into the lower container.
  • the aqueous binder solution having refractory properties is made to penetrate into the upper end of the tube, so that this binder permeates an area of this end over a height at least equal to the following height which the tube is intended to be engaged around the pouring nozzle of the first container.
  • This area is therefore made refractory, which allows it to be very resistant despite the absence of sintering in this area.
  • the aqueous binder solution having refractory properties is made to penetrate into the lower end of the tube so that this binder permeates an area of this end over a height at least equal to the depth at which the tube is intended to be immersed in the megal liquid contained in the second container.
  • this part of the tube is not likely to be damaged in contact with the liquid metal and aggressive products which cover the surface of the latter.
  • a binder having the desired refractory properties it is possible to use a phosphatic compound, boric acid, ethyl silicate and alkali silicates.
  • This binder can be penetrated into either end of the tube, by gravity, by dipping or by pressure injection.
  • the installation for the manufacture of a pouring tube comprises a frustoconical sleeve 1 perforated laterally and mounted in rotation around a horizontal axis XX 'and comprised between two rollers 2, 3 also frustoconical mounted in rotation around two axes YY 'and ZZ' parallel to the axis X-X '.
  • a frustoconical pouring tube 4 is formed, from a pasty and aqueous mixture of refractory particles (silica, alumina, magnesia, etc.) and mineral or organic fibers, coated in an organic or inorganic binder.
  • This mixture is added before use of about 40 to 50 % of water to obtain a mud or paste easily formable between the rollers 2,3 and the perforated sleeve 1.
  • the rollers 2,3 and the perforated sleeve 1 During the rotation of the latter, one sucks inside from the perforated sleeve 1 through the central pipe 5, the excess water contained in the pasty material of the tube 4. In this way about 30 to 40% of water is extracted from this material.
  • the partially dry frustoconical tube 4 is surrounded externally by a rigid frame constituted for example by a sheet metal sleeve 6, as indicated in FIG. 2.
  • a rigid frame constituted for example by a sheet metal sleeve 6, as indicated in FIG. 2.
  • the angle of the frustoconical surface of the metal sleeve 6 is 0.1 to 10 ° greater than the angle of the frustoconical surface of the tube 4. This considerably facilitates the engagement of the tube 4 in the sleeve 6, while eliminating any risk of cracks.
  • the end 4a of the tube 4 which is intended is made to penetrate.
  • an aqueous solution 7 of a binder having, after hardening, refractory properties greater than those of the basic organic or inorganic binder which is contained in the assembly of the tube 4.
  • the refractory binder solution 7 is made to penetrate by gravity into the upper end 4a of the tube 4 arranged vertically, by means of a container 8 in the form of a crown, open towards the high and whose pierced bottom 8a is applied to the upper edge of the end of the tube 4.
  • the refractory binder 7 in aqueous solution can be a phosphoric compound, boric acid, silicate ethyl, silica sol or alkaline silicates.
  • the tube 4 is made from acidic refractory particles, such as silica, a solution containing 20 to 50% (preferably 40%) by weight of pure aluminum monophosphate, therefore acid, is preferably used.
  • an aqueous solution preferably comprising 20 to 50% by weight of aluminum monophosphate, neutralized by an alkaline oxide, is used.
  • the aqueous solution of refractory binder 7 penetrates by gravity into the end 4a of the tube 4. This penetration is possible because the material of the tube 4. has lost 30 to 40% of its weight of water during the suction step, so that this material is thus able to re-absorb an almost equivalent amount of water.
  • the speed of penetration of the refractory binder solution 7 into the end of the tube depends on its viscosity which is itself a function of the concentration of the solution.
  • the solution 7 contains more than approximately 50% of aluminum monophosphate, this solution is too viscous, so that it penetrates too slowly and to an insufficient depth from the end 4a of the tube.
  • solution 7 penetrates into the end 4a of the tube over a depth p (see FIG. 4) at least equal to the height h at which the end 4a of the tube 4 is intended to be engaged on the pouring nozzle 9 of the first container.
  • the refractory particles of the tube located in the zone where they are exposed directly to the heat given off by the jet of metal passing through the tube, sinter, which makes it possible to maintain the mechanical cohesion of the tube beyond the decomposition or disintegration temperature of the base binder.
  • this sintering does not take place in the hatched zone of FIG. 4 which is protected from heat by the pouring nozzle 9.
  • the cohesion of this zone is ensured thanks to the binder which is introduced therein by means of solution 7.
  • This binder by hardening gives this zone refractory properties clearly superior to those of the material located under the latter.
  • this zone exhibits remarkable thermal and mechanical behavior.
  • the seal between the nozzle 9 and the end 4a of the tube 4 remains excellent, even after numerous successive clearances and engagements of the tube with respect to the nozzle 9. The life of the tube 4 is therefore considerably prolonged. .
  • the refractory binder solution 7 can also be introduced by gravity into the end 4a of a tube 4, arranged horizontally, as shown in FIG. 3.
  • the container 10 in the form of a crown has a perforated side wall 10a which is applied against the edge of the end 4a of the tube.
  • This container 10 is supplied with solution 7 by a vertical funnel 11.
  • this solution 7 is penetrated by dipping the end 4b of the tube 4 in a container containing this solution 7.
  • FIGS. 2 and 3 can, of course, also be applied for impregnating the lower end 4b of the tube 4.
  • the dipping method illustrated in FIG. 5 may also be suitable. for impregnating the upper end 4a.
  • the refractory binder solution 7 it is necessary for the refractory binder solution 7 to penetrate into the end 4b of the tube, over a height h l (see hatched part of FIG. 6), at least equal to the depth at which this end 4b of the tube is intended to immerse in the liquid metal which is contained in the lower container.
  • the refractory binder solution 7 can also be made to penetrate into the end 4a of the tube 4, by means of a frustoconical container 12 fitted into the tube 4 and comprising an perforated side wall 13 which allows the solution 7 to pass through. .
  • the solution 7 can also be injected under pressure into the end 4a or 4b of the tube 4.
  • the outer sheet 14 of the latter comprises in the vicinity of the upper end 4a an annular bead 15 making it possible to produce around the thermally insulating wall of the tube an annular space communicating with a lateral tube 16, through which the refractory binder solution 7 can be injected under pressure, during the aspiration step.
  • Pressure injection allows the use of. binder solutions more viscous than the previous ones, therefore more concentrated, which improves the refractory power of the ends 4a and 4b of the tube 4.
  • the aforementioned bead and a portion of the injection tube can be used as neutral gas injector when using the steel pipe.
  • the refractory binder is distributed throughout the tube. In this case, it is possible to add the refractory binder at the start directly into the initial mixture. This solution is perfectly suited for use as a refractory binder, ethyl silicate, silica soils and boric acid.
  • ethyl silicate can be added to the initial mixture in alcoholic solution containing 28 to 40% by weight of Si0 2 .
  • the silica soils can be used in aqueous dispersion at 30 to 40% by weight of Si0 2 .
  • the binder is added to the mixture to obtain a final concentration of Si0 2 in the tube of between 0.1 to 10%.
  • the preferred concentration of the latter in the tube is preferably between 0.1 and 13% by weight.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Glass Compositions (AREA)
  • Forging (AREA)
  • Powder Metallurgy (AREA)
EP82400890A 1981-05-27 1982-05-14 Verfahren zum Herstellen eines Giessrohres Expired EP0066492B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400890T ATE14850T1 (de) 1981-05-27 1982-05-14 Verfahren zum herstellen eines giessrohres.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8110519A FR2506641A1 (fr) 1981-05-27 1981-05-27 Tube de coulee et son procede de fabrication
FR8110519 1981-05-27

Publications (2)

Publication Number Publication Date
EP0066492A1 true EP0066492A1 (de) 1982-12-08
EP0066492B1 EP0066492B1 (de) 1985-08-14

Family

ID=9258932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400890A Expired EP0066492B1 (de) 1981-05-27 1982-05-14 Verfahren zum Herstellen eines Giessrohres

Country Status (8)

Country Link
US (1) US4432396A (de)
EP (1) EP0066492B1 (de)
AT (1) ATE14850T1 (de)
AU (1) AU545269B2 (de)
CA (1) CA1198874A (de)
DE (2) DE66492T1 (de)
ES (1) ES272875Y (de)
FR (1) FR2506641A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102292A3 (en) * 1982-08-23 1984-07-11 Daussan Et Compagnie Tubes for pouring molten metal
GB2135918A (en) * 1983-01-05 1984-09-12 Arbed Saarstahl Gmbh Pouring tube for casting steel
US4576365A (en) * 1981-11-13 1986-03-18 Daussan Et Compagnie Device for the removal of inclusions contained in molten metals
FR2583411A1 (fr) * 1985-06-18 1986-12-19 Refracol Dupont Cie Composition refractaire, procede de mise en oeuvre de la composition refractaire et installation de mise en oeuvre dudit procede.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230107A1 (de) * 1982-08-13 1984-03-01 Raimund Dipl.-Ing. 6238 Hofheim Brückner Verwendung von keramischem fasermaterial bei feuerfesten verschleissteilen von schiebeverschluessen fuer fluessige metallschmelze enthaltende gefaesse sowie schiebeverschluss mit feuerfesten verschleissteilen aus keramischem fasermaterial
US4642864A (en) * 1985-12-20 1987-02-17 Solar Turbines Incorporated Recuperator tube assembly
US5097871A (en) * 1989-02-10 1992-03-24 Kurimoto, Ltd. Pipe for pipe jacking
GB9002821D0 (en) * 1990-02-08 1990-04-04 Foseco Int Insulation sheaths
US5944060A (en) * 1995-12-26 1999-08-31 Boeing North American, Inc. Composite duct system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2270971A1 (de) * 1974-05-15 1975-12-12 Aikoh Co
FR2333599A1 (fr) * 1975-12-02 1977-07-01 Daussan Henri Dispositif a element tubulaire pour la coulee des metaux fondus
LU78970A1 (fr) * 1977-02-02 1978-06-26 Rech Metallurg Voor Research M Procede pour ameliorer la qualite des busettes de coulee continue des metaux et busette obtenue au moyen de ce procede

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892227A (en) * 1956-01-11 1959-06-30 Derald H Ruttenberg Metal casting process and elements and compositions employed in same
GB1155427A (en) * 1965-11-02 1969-06-18 Babcock & Wilcox Co Refractory Pouring Tubes
US3793042A (en) * 1970-12-24 1974-02-19 Combustion Eng Insulating monolithic refractory
US4165026A (en) * 1971-12-07 1979-08-21 Foseco Trading A.G. Tundish with expendable lining and easily removable nozzle
DE2451935C3 (de) * 1974-10-31 1981-03-12 Didier Taylor Refractories Corp., Cincinnati, Ohio Als plastische Masse, Stampfmasse oder zur Herstellung von keramischen Körpern geeignete Masse und ihre Verwendung.
SU607638A1 (ru) * 1976-12-27 1978-05-25 Липецкий политехнический институт Смесь дл изготовлени литейных керамических форм
JPS53143614A (en) * 1977-05-20 1978-12-14 Aikoh Co Continuously molded tundish lining structures for heat insulation
US4298554A (en) * 1977-11-14 1981-11-03 Lebanon Steel Foundry Coherent rigid solid material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2270971A1 (de) * 1974-05-15 1975-12-12 Aikoh Co
FR2333599A1 (fr) * 1975-12-02 1977-07-01 Daussan Henri Dispositif a element tubulaire pour la coulee des metaux fondus
LU78970A1 (fr) * 1977-02-02 1978-06-26 Rech Metallurg Voor Research M Procede pour ameliorer la qualite des busettes de coulee continue des metaux et busette obtenue au moyen de ce procede

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576365A (en) * 1981-11-13 1986-03-18 Daussan Et Compagnie Device for the removal of inclusions contained in molten metals
EP0102292A3 (en) * 1982-08-23 1984-07-11 Daussan Et Compagnie Tubes for pouring molten metal
US4792070A (en) * 1982-08-23 1988-12-20 Daussan Et Compagnie Tubes for casting molten metal
GB2135918A (en) * 1983-01-05 1984-09-12 Arbed Saarstahl Gmbh Pouring tube for casting steel
FR2583411A1 (fr) * 1985-06-18 1986-12-19 Refracol Dupont Cie Composition refractaire, procede de mise en oeuvre de la composition refractaire et installation de mise en oeuvre dudit procede.

Also Published As

Publication number Publication date
AU8383282A (en) 1982-12-02
DE66492T1 (de) 1983-04-28
ES272875U (es) 1984-03-01
AU545269B2 (en) 1985-07-04
FR2506641A1 (fr) 1982-12-03
ATE14850T1 (de) 1985-08-15
EP0066492B1 (de) 1985-08-14
ES272875Y (es) 1984-10-01
DE3265392D1 (en) 1985-09-19
FR2506641B1 (de) 1984-02-03
US4432396A (en) 1984-02-21
CA1198874A (en) 1986-01-07

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