EP1302262A1 - Verfahren zum Herstellen eines Giessrohres - Google Patents

Verfahren zum Herstellen eines Giessrohres Download PDF

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Publication number
EP1302262A1
EP1302262A1 EP02292501A EP02292501A EP1302262A1 EP 1302262 A1 EP1302262 A1 EP 1302262A1 EP 02292501 A EP02292501 A EP 02292501A EP 02292501 A EP02292501 A EP 02292501A EP 1302262 A1 EP1302262 A1 EP 1302262A1
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EP
European Patent Office
Prior art keywords
tube
refractory
pouring
powder
mass
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.)
Withdrawn
Application number
EP02292501A
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English (en)
French (fr)
Inventor
André Daussan
Jean-Charles Daussan
Gérard Daussan
Jean Rozière
Marc Chastant
Gérard Gillot
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Individual
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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
Priority claimed from FR0113058A external-priority patent/FR2830472A1/fr
Application filed by Individual filed Critical Individual
Publication of EP1302262A1 publication Critical patent/EP1302262A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B22D41/505—Rings, inserts or other means preventing external nozzle erosion by the slag

Definitions

  • the present invention relates to a method for make a pouring tube suitable for not giving rise to no release of hydrogen when molten metal is poured inside said tube. It relates to also a pouring tube produced by the implementation of this process.
  • a method for making a tube casting comprising a step of setting place, inside an external metallic ferrule, a curable and sinterable refractory mass made from a refractory composition in powder comprising a binder adapted to decompose or disintegrate when molten metal is poured the interior of said tube, and a step of heating the assembly to harden the curable mass.
  • a process of the aforementioned type for forming a thermally insulating material pouring tube and low density consisting of a mixture of refractory particles and coated mineral fibers in a binder This tube is formed around a sleeve perforated from a pasty and aqueous mixture comprising the above components. It is reinforced externally by a metal frame and then is carried in an oven to evaporate the residual water and harden the binder. When casting molten metal, inorganic particles sinter, allowing to ensure the cohesion of the tube after decomposition or disintegration of the binder.
  • pour tubes refractories based on graphite alumina which are, at the during their manufacture, kept in an oven of cooking at a temperature high enough to cause a ceramic hold of the particles constituting these tubes.
  • These tubes are very reliable and do not cause no risk of evolution of hydrogen which could harm the quality of the cast metal.
  • these tubes are manufactured by implementing a complex process of so these tubes have a high unit price.
  • This long and expensive process is suitable for realization of a sliding plate, but is not suitable for making a casting plate.
  • the object of the present invention is to remedy the drawbacks of known methods and propose a method of the above type making it possible to produce a reliable and economical pouring tube, having a simple structure, and avoiding any risk of evolution of hydrogen during metal casting in fusion.
  • the intermediate layer constituted by the sinterable refractory mass contains no organic matter and contains practically no more water of constitution after the heating step. So, when subjected to the temperatures reached during the casting of molten metal, this material sintered with practically no clearance hydrogen.
  • Another version of the present invention relates to a pouring tube produced by the implementation of the above process.
  • the process illustrated in Figure 1 is a process for producing a pouring tube 1 adapted not to give rise to no evolution of hydrogen when molten metal is poured inside said tube.
  • This process includes a step of setting place, inside an external metallic ferrule 3, a curable and sinterable refractory mass made from a refractory composition sinterable powder comprising a binder adapted to decompose or fall apart when molten metal is poured inside said tube, and a step of heating the assembly to harden the mass curable 2.
  • Such a pouring tube 1 is adapted to be put in place, in a known conventional manner that did not need to be described in detail here, under the device sealing the molten metal outlet nozzle a ladle filled with this metal.
  • the ladle fitted with this tube is then placed over a distributor or tundish suitable for receiving molten metal from the pocket and transfer this metal to at least one ingot mold of continuous casting of said metal.
  • the lower part of the pouring tube is immersed in the molten metal and is subjected to the aggression of the metal in smelting and slag which generally covers the surface upper of said metal.
  • a refractory tube 5 made of refractory material hardened and / or baked in the conventional way for obtain a ceramic or hydraulic outlet.
  • a support 4 has been illustrated in FIG. 1 horizontal comprising an annular wedge 8 allowing the fitting of the metal ferrule 3, and a stud central 9 for positioning the refractory tube 5 in a predetermined substantially coaxial position with respect to the metal shell 3.
  • the central stud has a hole in the middle central 10 adapted to receive the lower end 11 a central axis 12 carrying centering devices 13, such as discs or cross bars, for center the axis 12 substantially in the axis of the tube refractory 5.
  • centering devices 13 such as discs or cross bars
  • the axis 12 is higher than the tube 5 and the ferrule 3 and allows the installation of a device, of any known type, shown diagrammatically in 14, for introducing the curable refractory composition and sinterable in the free space 20 made between the shell metal 3 and the refractory tube 5.
  • the curable refractory composition and sinterable is brought into the device 14 by any means shown diagrammatically by arrow 15, by example by a chute 16.
  • the device introduction 14 is a device comprising a annular hopper for dispensing at the same time the refractory composition over the entire periphery of the space 20 between the shell 3 and the refractory tube 5.
  • Distributor 14 can be replaced by any other equivalent means, in particular by means pivoting about the central axis 12.
  • the refractory tube 5 present at its lower end in contact with the support 4 a flange 50 projecting radially towards the exterior and substantially in contact with the surface inner 7 of the shell 3, so as to retain said refractory mass 2 in the space 20 between the shell 3 and the tube 5 before the hardening of said mass.
  • the refractory tube 5 can be a tube monobloc, or be made from several ferrules substantially coaxial assembled one on the other, by example using a mineral glue based on silicate or phosphate.
  • the refractory tube 5 can be produced by refractory concrete, in particular self-pouring refractory concrete, for example based on tabular alumina. We knows that such self-pouring concrete flows easily and can perfectly fill the mold cavity in which it is poured, which makes it possible to obtain after baking at an adequate temperature allowing obtain the ceramic or hydraulic setting of particles making up this concrete and eliminating the preparation and constitution water of this concrete, a refractory tube of relatively precise dimensions.
  • the refractory tube 5 can be obtained at from an appropriate refractory composition by extrusion and sintering of this composition to obtain the ceramic socket.
  • the refractory tube 5 has a substantially shaped cylindrical. This means that the inner surface 18 and the outer surface 6 of said tube 5 can be perfectly cylindrical or that either or each of these two surfaces can be slightly frustoconical by slightly flaring up or towards the bottom. Similarly, in the case where the refractory tube 5 consists of several ferrules, these ferrules are of preferably cylindrical but could also have their inner surface and / or their outer surface slightly tapered.
  • the inner 18 and outer 6 surfaces of the refractory tube 5 are preferably coaxial, but could be slightly offset if necessary one in relation to the other.
  • the external metallic ferrule 3 has a shape any known. It is preferably equipped with means to facilitate attachment of the composition curable 2 when cured on the inner surface 7 of ferrule 3.
  • the outer shell 3 can thus be shaped cylindrical, and present on its inner surface 7 means, for example protrusions projecting towards inside or outside, allowing hanging refractory composition 2 after hardening, and shown schematically at 17 in Figure 1.
  • the pouring tube 1 After heating causing hardening of the refractory insulating mass 2, the pouring tube 1 is turned over so that the concrete flange 50 refractory or baked refractory product is found in the upper part 22 of the pouring tube 1.
  • This flange 50 thus advantageously constitutes a seat resistant to fix the pouring tube 1 of substantially sealed under a ladle, not shown, as shown above.
  • the inner tube 5a is a mandrel, acting as internal mold, which is removed after step c) of heating resulting in hardening of the mass refractory insulation 2.
  • the refractory insulating mass 2 once hardened constitutes a monolithic block inside the external metallic ferrule 3.
  • This monolithic block is able to resist by itself, at least for a predetermined time, under the conditions created by the casting of molten metal in the central channel 29 formed in the axis of the mass refractory insulation 2 after extraction of the internal tube 5a.
  • the inner tube 5a can be made in one any material capable of withstanding the temperature necessary for hardening of the insulating mass refractory 2, as well as the mechanical forces generated during the introduction of the powder into space 20 between the inner tube 5a and the metallic ferrule external 3.
  • the inner tube 5a intended to be removed after hardening of the refractory insulating mass 2 can thus be constituted by a metal tube, a tube or a core of cardboard or even plastic capable to withstand the temperature of around 180 ° C, this core can be full.
  • the ferrule 3 is returned so that its flared upper part 32 rests on the support 4, around an insert 30 of concrete or the like threaded on the inner tube 5a.
  • the insert 30 is shaped so as to adapt to the shape of the bottom surface of the sealing device on which the pouring tube 1 after its manufacture.
  • the pouring tube 1 is produced as indicated above.
  • the inner tube 5a After introduction and hardening of the mass refractory insulator 2, the inner tube 5a is removed and we return the pouring tube 1 which thus presents to its flared upper end 22 the insert 30 described above.
  • the inner tube 5a is constituted by a mandrel which is in one piece with support 4.
  • the ferrule metal 3 is placed on the support 4 with its flared end up.
  • the envelope metallic exterior 3 allows easy handling of the pouring tube 1 and ensures the air tightness of this tube 1 to avoid contact between molten metal flowed inside the tube, and oxygen from the air.
  • the insulating mass refractory 2 includes particles of at least one of the following materials conventionally used as refractory materials: silica, zircon, carbide silicon, alumina, silico-aluminous materials, chamotte, bauxite, mullite, magnesia, calcined dolomite, chromite, chromium magnesia, olivine, forsterite, or similar.
  • the particle size of these particles is generally in the range of 0 to 3 mm, preferably in the range of 0 to 1 mm, and is predetermined so as to obtain, after hardening of the mineral binder, a predetermined internal porosity, by example between 40% and 50%, so as to give to refractory mass 2 insulating properties thermal.
  • the tube does not blush during the casting of molten metal.
  • the sinterable refractory composition is by example based on calcined magnesia also known as death. Its particle size is chosen so as to obtain a very fluid flow of this composition during its introduction inside the space 20 of the tube 1.
  • This powder is for example formed of grains of main dimension less than 1 mm, although larger grains are admissible depending on the thickness of the space 20.
  • the mineral binder comprising chemically or physically bound water is a hydrated crystallized salt chosen from silicates, carbonates, sulfates, nitrates, aluminates, hydrated borates and phosphates or the like.
  • the mineral binder can also be a binder acid and include for example a hydrated salt and up to 50% by weight of an organic acid such as oxalic acid or citric acid.
  • the substantially dry curable mineral binder to heat is for example a sodium metasilicate hydrated powder, used for example in a proportion between 0.1 and 10%, advantageously between 2 and 7% of the total weight of the composition.
  • a binder melts at around 80 ° C, allowing it to escape its water of crystallization and hardening.
  • a hardening of the mass is obtained by heating the entire pouring tube 1 in its entirety at a temperature of the order of 180 ° C., for example in an oven, for 1 hour or 2 hours or more, or by example by microwave radiation.
  • the powder thus introduced inside the pouring tube 1 has, for example, a density before hardening advantageously between 1.5 and 2.2 g / cm 3 , for example of the order of 1.6 to 1 , 8 g / cm 3 , which gives it a certain porosity and therefore a refractory insulating power.
  • the powder used is advantageously slightly moistened, with about 1 to 2% water, to facilitate its flow and facilitate the setting of the binder mineral powder.
  • Such a composition is self-hardening from that we add a little water.
  • the metal casing 3 can also carry on its outer surface, in a known manner, means, for example studs shown diagrammatically at 24, allowing the fixing of the pouring tube 1, for example by screwing if these studs are arranged in a helix, under the pocket of casting. It can also carry a stitching such as 25 allowing to breathe into the central channel 29 to through the porous mass 2 an inert gas under pressure, for example argon, to prevent air intake by the jet of molten metal (see Figure 2), and thus preventing any contact between the molten metal and the oxygen in the air.
  • an inert gas under pressure for example argon
  • the lower part 21 of the pouring tube 1, suitable for being immersed in molten metal is, in the example of Figure 2, covered externally by a protective sleeve 23 of any known type, made for example in graphite alumina or in a sinterable composition based on magnesia powder, paper fibers and a binder.
  • the binder used can be an organic binder, for example a binder phenolic, insofar as the evolution of hydrogen caused by decomposition of the binder on contact with the molten metal and / or slag occurs at the outside of the pouring tube 1 and presents a risk very low to be picked up by molten metal.
  • Figure 5 has been carried out by implementing the process illustrated in Figure 3, with the flared end 32 of the shell external 3 resting on the support 4, to obtain a resistant seat 33 capable of replacing insert 30.
  • annular layers were produced concentric whose compositions are compatible between them, comprising an inner layer 35 formed for example with the refractory insulating mass 2 constituting the major part of the pouring tube 1, and an outer layer 36 having a composition and a grain size chosen in a classic way to resist particularly erosion by slag.
  • the tube internal 5b is formed by a very thin sheet, of a thickness of about 0.1 or 0.2 mm, which is left to inside the tube 1. It is of course possible to use a such a very thin sheet consumable in the process illustrated in Figures 3 or 6 in which the tube or internal mandrel 5a after hardening of the mass 2, as in the process illustrated in Figure 1.
  • the composition is varied radially and / or the particle size of the powder constituting the mass refractory insulator 2 between the annular layer interior 38.40, suitable for facing the metal jet molten inside the central channel 29, and the outer annular layer 37, 39, in contact with the external metallic ferrule 3.
  • This variation is preferably discontinuous insofar as it is in principle necessary to separate the different layers from each other ring fingers during the introduction of the powder into space 20, by a ferrule which can be a ferrule removable removed after introduction of the powder, or thin ferrule 41 consumable, for example in sheet metal thin, which stays in place in the pouring tube 1.
  • an outer annular layer is shown 37 relatively insulating and a little crumbly, little expensive, and an inner annular layer 38 plus refractory and denser than layer 37.
  • an outer annular layer 39 denser, more refractory, more resistant, than the inner ring layer 40 less dense and more brittle than layer 39.
  • Such a tube can support the casting of metal molten contained in several ladles successive, can be used again after cooling, and does not give rise to the phenomenon fattening the walls of the central channel 29 by adhesion of metal and / or solidified slag.
  • Such a very competitive price pouring tube can easily be adapted to particular dimensions each user's installations.
  • any conformation especially an upper flange on the refractory tube 5, or a resistant seat 33, or an insert 30, allowing a substantially waterproof fixing under the device sealing a ladle.
  • each tube with casting 1 of asperities 17, and / or of ears 19, and / or of studs 24, and / or a tap 25, and / or a sleeve protection 23, and / or an insert 30, and / or a seat resistant 33.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP02292501A 2001-10-10 2002-10-10 Verfahren zum Herstellen eines Giessrohres Withdrawn EP1302262A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR0113058A FR2830472A1 (fr) 2001-10-10 2001-10-10 Procede pour realiser un tube de coulee
FR0113058 2001-10-10
FR0200440 2002-01-15
FR0200440A FR2830473B1 (fr) 2001-10-10 2002-01-15 Procede pour realiser un tube de coulee

Publications (1)

Publication Number Publication Date
EP1302262A1 true EP1302262A1 (de) 2003-04-16

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EP02292501A Withdrawn EP1302262A1 (de) 2001-10-10 2002-10-10 Verfahren zum Herstellen eines Giessrohres

Country Status (2)

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EP (1) EP1302262A1 (de)
FR (1) FR2830473B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112276068A (zh) * 2020-10-27 2021-01-29 宜昌船舶柴油机有限公司 耐火水泥浇注包电热烤包装置及制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006411A (en) * 1977-10-17 1979-05-02 Gen Refractories Co Slide gate and method for manufacture
GB2045676A (en) * 1979-03-27 1980-11-05 Sanac Spa Improvements in or relating to methods of producing encapsulated refractory bricks
US4248815A (en) * 1978-03-13 1981-02-03 Kaiser Electro Refractaire France Process for the manufacture of gate valves for closure devices having a pouring nozzle and similar objects
US4323529A (en) * 1979-12-14 1982-04-06 Uss Engineers And Consultants, Inc. Method for making a refractory article
EP0178053A1 (de) * 1984-09-06 1986-04-16 Foseco Trading A.G. Giessrohre
EP0198237A1 (de) * 1985-03-20 1986-10-22 Gr-Stein Refractories Limited Feuerfeste Schieberplatte
JPS62144868A (ja) * 1985-12-18 1987-06-29 Kurosaki Refract Co Ltd 鋳造用ノズルの製造方法
JPH06142899A (ja) * 1992-11-10 1994-05-24 Shinagawa Refract Co Ltd 溶鋼鋳造用下ノズル

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006411A (en) * 1977-10-17 1979-05-02 Gen Refractories Co Slide gate and method for manufacture
US4248815A (en) * 1978-03-13 1981-02-03 Kaiser Electro Refractaire France Process for the manufacture of gate valves for closure devices having a pouring nozzle and similar objects
GB2045676A (en) * 1979-03-27 1980-11-05 Sanac Spa Improvements in or relating to methods of producing encapsulated refractory bricks
US4323529A (en) * 1979-12-14 1982-04-06 Uss Engineers And Consultants, Inc. Method for making a refractory article
EP0178053A1 (de) * 1984-09-06 1986-04-16 Foseco Trading A.G. Giessrohre
EP0198237A1 (de) * 1985-03-20 1986-10-22 Gr-Stein Refractories Limited Feuerfeste Schieberplatte
JPS62144868A (ja) * 1985-12-18 1987-06-29 Kurosaki Refract Co Ltd 鋳造用ノズルの製造方法
JPH06142899A (ja) * 1992-11-10 1994-05-24 Shinagawa Refract Co Ltd 溶鋼鋳造用下ノズル

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 372 (M - 648) 4 December 1987 (1987-12-04) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 449 (M - 1660) 22 August 1994 (1994-08-22) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112276068A (zh) * 2020-10-27 2021-01-29 宜昌船舶柴油机有限公司 耐火水泥浇注包电热烤包装置及制造方法

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Publication number Publication date
FR2830473B1 (fr) 2005-01-14
FR2830473A1 (fr) 2003-04-11

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