EP0146079A2 - Pièce réfractaire perméable aux gaz - Google Patents

Pièce réfractaire perméable aux gaz Download PDF

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Publication number
EP0146079A2
EP0146079A2 EP84114799A EP84114799A EP0146079A2 EP 0146079 A2 EP0146079 A2 EP 0146079A2 EP 84114799 A EP84114799 A EP 84114799A EP 84114799 A EP84114799 A EP 84114799A EP 0146079 A2 EP0146079 A2 EP 0146079A2
Authority
EP
European Patent Office
Prior art keywords
refractory material
gas
structure according
metal
channels
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
EP84114799A
Other languages
German (de)
English (en)
Other versions
EP0146079A3 (en
EP0146079B1 (fr
Inventor
Jean-François Liesch
Friedrich Kassegger
Rudolf Handler
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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
Application filed by Arbed SA filed Critical Arbed SA
Priority to AT84114799T priority Critical patent/ATE50797T1/de
Publication of EP0146079A2 publication Critical patent/EP0146079A2/fr
Publication of EP0146079A3 publication Critical patent/EP0146079A3/de
Application granted granted Critical
Publication of EP0146079B1 publication Critical patent/EP0146079B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21C5/44—Refractory linings
    • 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
    • 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
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • the invention relates to a gas-permeable structure made of refractory material for blowing gases into metal treatment vessels through the lining thereof.
  • the oxygen inflation processes used to fresh iron are improved in such a way that secondary gases, such as nitrogen or argon, are blown in in a controlled manner through the converter base. Blowing of gases into the metal bath through the bottom of the vessel or lining the walls of the vessel can also be considered in the case of oxygen bottom blowing processes and in metal treatment vessels, such as furnace pans, desulfurization pans and the like.
  • the gas-permeable structures to be inserted into the lining of the vessel are required to have a durability which corresponds to that of the other refractory lining, since it is difficult to replace worn-out blow-through stones when hot.
  • the gas introduction should be possible both continuously and in particular discontinuously, i.e. the vessel should also be operable without the introduction of gas and, after the gas supply has been switched on again, the structures should be permeable to gas in an unchanged manner.
  • the gas permeability of the structure should last over its service life, i.e. over an entire kiln trip, remain essentially the same.
  • this structure is provided with a longitudinal metal housing, a free inner end face and a distribution space for gas supply on the outer end face and has local interruptions in the interior for the gas passage between the end faces, which are provided with metal inserts.
  • This structure can consist of segments or strips of refractory material and metal inserts in the form of steel sheets in an alternating arrangement. According to LU 81 208, these metal inserts can be flat, corrugated, tubular or wire-shaped and have a small wall thickness.
  • the passage of gas occurs through the narrow gaps that remain free between the refractory material and the metal inserts.
  • the refractory material is subjected to the gas pressure, which has a number of disadvantages.
  • the metal casing made of sheet steel with a relatively thick wall thickness must be made with gas-tight weld seams.
  • a mortar layer must be arranged between the refractory material and the metal housing, which is difficult to apply.
  • a device for blowing purge gas through the bottom or the wall of a converter for metal freshening consisting of a distribution chamber attached to the outer surface of the converter jacket and provided with a gas supply, from which several cylindrical nozzle pipes originate. that pass through the converter jacket, the permanent lining and the wear lining and extend to the inner surface of the lining.
  • These nozzle pipes are flattened in the area of the wear chuck by compressing them to a maximum internal width of 1 mm and are expediently embedded in corresponding recesses in the wear chucks.
  • installing and renewing such a blowing device is complex and time-consuming, and at best it only appears to be economically feasible for small converters.
  • the object of the invention is to avoid the aforementioned disadvantages and to provide a blowing device in the form of a gas-permeable refractory structure which can be easily inserted into the refractory lining and can be replaced when worn, and in which exposure to the refractory material with the gas pressure is avoided.
  • this object is achieved in the case of a gas-permeable structure of the type mentioned at the outset, which has at least one local interruption in its interior for the gas passage that runs between its end faces and is provided with a metal insert, in that the metal insert in the form of at least one on the side closed, narrow channel is present and that the gas distribution space is closed off from the refractory material by a sheet metal plate in which the channels are tightly fastened, so that the refractory material is kept free from exposure to gas pressure.
  • Advantageous embodiments of the invention are given in the subclaims.
  • the refractory material of the structure and the metal housing surrounding it are depressurized, ie they are free from pressurization by the purge gas.
  • the metal housing is only used for transport and installation help and can be made from a sheet of less thickness, for example 2 mm or less.
  • the installation of gas-tight weld seams and the seal between the metal housing and the refractory material can also be omitted if the structure is held together by other measures, for example by gluing.
  • the laterally closed, narrow channels provided according to the invention preferably consist of sheet steel or sheet copper. Depending on the desired amount of gas passing through, their inner width is approximately 0.3 to 1 mm.
  • the metallic channels can be inserted into slots or grooves which are formed in the refractory base body or in individual prefabricated segments thereof. However, it is also possible to build up the duct system in an initially empty metal housing and to pour or stamp out the intermediate space with refractory material. Furthermore, it is possible to design only the central part of the refractory material, in which the metallic channels are embedded, as ramming or casting bodies and to form the edge parts from prefabricated bodies or segments.
  • the metallic channels are thin-walled and the refractory material is subject to high thermal expansion, as is the case with magnesite material, the channels can be compressed, which impedes the passage of gas. This phenomenon cannot be prevented with certainty even by inserting wires into the channels, as is already provided in EP-A-64 449.
  • This jacket can consist of ceramic fibers, for example asbestos or cerafelt fibers. It is essential that the material used is both temperature-resistant and, given the different temperatures prevailing in the building, has properties which ensure that the expansions occurring in the building are absorbed.
  • FIG. 1 shows A blow stone suitable for use in a converter base in these in FIG. 1 and in FIG. 2 in a top view of the upper or inner end face.
  • 3 shows on a larger scale a longitudinal section through the lower or outer part of this blow stone
  • FIG. 4 shows a cross section along line IV-IV of FIG. 3 and FIG. 5, and
  • FIG. 6 shows the detail "A" of FIG. 4 in two different embodiments on a further enlarged scale.
  • 7 shows a sink suitable for use in a pan bottom in longitudinal section
  • FIG. 8 shows a top view of the upper or inner end face.
  • FIG. 9 shows a top view of the upper or inner end face of another embodiment of the sink block according to FIG. 7.
  • the blow stone shown in Fig. 1 to 6 is suitable for use in a converter base.
  • the refractory material is exposed on its upper end face 11, which faces the interior of the converter when installed.
  • On the opposite end face 12 there is a gas distribution space 13 which extends over the entire end face 12 and is delimited by an inner sheet metal plate 14 resting on the refractory material, narrow lateral sheet metal strips 15 and an outer base plate 16.
  • a tubular gas supply 3 is attached.
  • the four side surfaces of the blowing stone 1 are covered by a metal housing 17.
  • the refractory material of the blow stone 1 consists of three prefabricated sections or segments 18, 19, which are held together by the metal housing 17. Two of these segments, namely the two segments 18, are provided on one of their larger longitudinal side surfaces with four flat grooves 4 each, that of the outer and lower End face 12 of the refractory material extends to the inner or upper end face 11 and thus extends over the entire length of the refractory material.
  • the grooves 4 can be formed in the segments 18 during their manufacture by appropriately designing the press mold, or they can be worked into the finished segments, for example by milling, planing or cutting.
  • narrow metallic channels 5 are inserted, which are gas-tight on the sides.
  • These channels 5 are preferably made of sheet steel or copper and have a wall thickness of, for example, about 0.5 to 1 mm and an inside width of the order of 0.3 to 1 mm.
  • the channels 5 are inserted into corresponding openings in the inner sheet metal plate 14 of the gas distribution space 13 and connected to the sheet metal plate 14 e.g. connected gas-tight by soldering, welding or gluing. This measure ensures that the refractory material and the outer metal housing 17 remain free from exposure to the gas pressure of the treatment gas, which enters the gas distribution space 13 through the gas supply 3 and from there passes through the narrow channels 5 into the metal bath.
  • Compliance with the channel width in the order of magnitude of 0.3 to 1 mm ensures that, on the one hand, the required amount of gas can be conveyed through the channels 5 into the metal bath and that, on the other hand, if the gas supply is switched off temporarily, there is no permanent laying of the channels due to penetration Metal melt comes, but that the channels can be blown free after switching on the gas supply.
  • the channels 5 can be provided with known inserts of one or more metal wires 6, as shown in FIG.
  • Another measure according to the invention for preventing the channels from being compressed as a result of the thermal expansion of the refractory material is to coat the channels 5 on the outside with a compressible refractory fibrous material 7, preferably to wrap as shown in Fig.6. Due to its compressibility, the fibrous material 7 can absorb the thermal expansion of the refractory material, so that there is no compression of the channels 5.
  • FIG. 7 to 9 show a sink 2 suitable for use in a pan bottom. It has the shape of a truncated cone, which, in cooperation with a known perforated brick with a truncated cone-shaped opening, makes it easy to replace this sink.
  • the refractory material is exposed on a smaller end face 21, which faces the inside of the pan when installed.
  • the refractory material has a frustoconical central recess 20, in which a gas distribution space 23 is arranged.
  • the refractory material of the sink 2 can consist of refractory mass.
  • the metal structure consisting of the channels 5, the gas distribution space 23, the base plate 26 and the metal housing 27 is first produced and its free space is filled with a refractory casting or ramming mass, so that a refractory mass body 28 ent stands in which the channels are embedded. Since not only the subsequent thermal expansion of the refractory material acts on the channels 5, but also the compression pressure for the refractory mass, the risk of compression is particularly great here. Therefore, in this case, the embodiment according to FIG. 6 is recommended for the channels 5, ie the coating, for example wrapping, with a compressible refractory fibrous material 7.
  • the refractory material of the sink 2 can also consist of several prefabricated segments. According to FIG. 9, there are two such segments 29 in the form of half truncated cones, which are provided with slots or grooves 4 ′, which complement one another in pairs, for receiving the channels 5.
  • the gas distribution space 23 of the sink 2 could extend over the entire outer end face 22, or the gas distribution space 13 of the blow stone 1 could be limited to a central area arranged in a recess in the refractory material.
  • the refractory material of the structure according to the invention can consist, for example, of sintered or melted magnesia, of a mixture of magnesia and chrome ore, of pre-reacted magnesia chrome ore sintered or melted material or of high alumina material. Enrichment of the refractory material with a carbon carrier is also possible.
  • the material can be used in the form of baked segments or it can be chemically bonded, pitch bonded or resin bonded. Subsequent impregnation of the prefabricated burned or bonded segments with a carbon carrier, such as tar, pitch or synthetic resin, is also possible.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Soft Magnetic Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Ceramic Products (AREA)
  • Glass Compositions (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Resistance Heating (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP84114799A 1983-12-12 1984-12-05 Pièce réfractaire perméable aux gaz Expired - Lifetime EP0146079B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114799T ATE50797T1 (de) 1983-12-12 1984-12-05 Gasdurchlaessiger baukoerper aus feuerfestem material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85131 1983-12-12
LU85131A LU85131A1 (de) 1983-12-12 1983-12-12 Gasdurchlaessiger baukoerper aus feuerfestem material

Publications (3)

Publication Number Publication Date
EP0146079A2 true EP0146079A2 (fr) 1985-06-26
EP0146079A3 EP0146079A3 (en) 1987-01-07
EP0146079B1 EP0146079B1 (fr) 1990-03-07

Family

ID=19730188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114799A Expired - Lifetime EP0146079B1 (fr) 1983-12-12 1984-12-05 Pièce réfractaire perméable aux gaz

Country Status (13)

Country Link
US (1) US4647020A (fr)
EP (1) EP0146079B1 (fr)
JP (1) JPS60149709A (fr)
KR (1) KR850004990A (fr)
AT (1) ATE50797T1 (fr)
AU (1) AU566336B2 (fr)
BR (1) BR8406349A (fr)
CA (1) CA1247861A (fr)
DE (1) DE3481527D1 (fr)
ES (1) ES291744Y (fr)
IN (1) IN162802B (fr)
LU (1) LU85131A1 (fr)
ZA (1) ZA849690B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538498A1 (de) * 1985-10-30 1987-05-07 Didier Werke Ag Einduesvorrichtung fuer metallurgische gefaesse
EP0239152A1 (fr) * 1986-03-10 1987-09-30 Hoogovens Groep B.V. Système d'alimentation en gaz d'un convertisseur pour la fabrication d'acier
DE3625117C1 (en) * 1986-07-25 1987-11-26 Didier Werke Ag Gas-flushing cone
EP0282824A2 (fr) * 1987-03-19 1988-09-21 Arbed S.A. Dispositif pour vidanger des récipients métallurgiques
EP0311785A1 (fr) * 1987-10-14 1989-04-19 PA-HA-GE HÜTTEN UND GIESSEREIBEDARF GMBH & CO. KG Brique de balayage pour récipients métallurgiques
DE3904543A1 (de) * 1988-05-13 1989-11-23 Insul Co Vorrichtung zum einfuehren von ruehrgas in geschmolzenes metall in dosierter menge
EP0467042A2 (fr) * 1990-07-19 1992-01-22 Veitsch-Radex Aktiengesellschaft Für Feuerfeste Erzeugnisse Procédé de fabrication d'un élément d'insufflation à porosité orientée et à résistance à l'infiltration pour récipients métallurgiques
EP0525591A1 (fr) * 1991-07-29 1993-02-03 Tokyo Yogyo Kabushiki Kaisha Brique pour l'introduction de gaz dans un récipient à affiner le métal en fusion
WO1997018335A2 (fr) * 1995-11-14 1997-05-22 DÖTSCH, Marie-Luise Plaques-modeles refractaires dotees de canaux d'ecoulement de gaz

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741515A (en) * 1986-10-20 1988-05-03 Bethlehem Steel Corporation Apparatus for introducing gas into a metallurgical vessel
US4840356A (en) * 1988-06-13 1989-06-20 Labate Michael D Externally replaceable stirring plug for molten metal vessels
DE4101833A1 (de) * 1991-01-23 1992-08-06 Hoesch Stahl Ag Vorrichtung zum einleiten von liftgas in den ruessel einer vakuumanlage
US5249778A (en) * 1992-04-14 1993-10-05 Dolomitwerke Gmbh Gas stir plug device with visual wear indicator
CA2073219C (fr) * 1992-07-06 1995-12-19 Keizo Aramaki Refractaire pour soufflante de cuve d'affinage de metal en fusion
DE4335643C1 (de) * 1993-10-15 1994-10-27 Mannesmann Ag Verfahren und Vorrichtung zum Einleiten von Gasen in Metallschmelzen
DE4411538C1 (de) * 1994-04-02 1995-12-14 Didier Werke Ag Verfahren zum Herstellen einer Gas- und/oder Feststoffblaseinrichtung für metallurgische Gefäße, sowie nach dem Verfahren hergestellte Blaseinrichtung
RU2235135C1 (ru) * 2003-06-16 2004-08-27 Хлопонин Виктор Николаевич Фурменное устройство для введения газовых сред под уровень жидкого металла
CN110066906A (zh) * 2019-06-06 2019-07-30 洛阳利尔耐火材料有限公司 一种一次成型整体透气砖、成型模具以及成型方法
LU500076B1 (en) * 2021-04-23 2022-10-24 Exus Refractories Spa Gas purging plug for a metallurgical container

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1957940B2 (de) * 1968-12-06 1978-06-29 Veitscher Magnesitwerke Ag, Wien Feuerfeste Auskleidung für öfen und Gefäße mit Dehnungsausgleich und Masse für eine solche Auskleidung
EP0021861A1 (fr) * 1979-04-25 1981-01-07 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Pièce réfractaire perméable aux gaz et son procédé de fabrication
EP0043338A1 (fr) * 1980-06-25 1982-01-06 Arbed S.A. Elément réfractaire perméable aux gaz
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz
EP0070197A1 (fr) * 1981-07-15 1983-01-19 Nippon Steel Corporation Arrangement de tuyères pour convertisseurs d'acierie à soufflage par le fond
GB2102926A (en) * 1981-06-03 1983-02-09 Nippon Kokan Kk Gas blowing nozzle, and production and usage thereof
GB2115539A (en) * 1982-02-24 1983-09-07 Didier Werke Ag Devices for introducing gases into metallurgical vessels
EP0095436A1 (fr) * 1982-05-25 1983-11-30 Arbed S.A. Pièces réfractaires perméables au gaz
EP0064449B1 (fr) * 1981-04-24 1984-11-28 Compagnie Francaise Des Aciers Speciaux Dispositif de soufflage de gaz de brassage dans un convertisseur d'affinage des métaux

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238121A (en) * 1977-10-07 1980-12-09 Kawasaki Steel Corporation Hearth structure of an oxygen-bottom-blowing converter
SE7906404L (sv) * 1978-08-28 1980-02-29 Aikoh Co Lansror
JPS5839720A (ja) * 1981-09-02 1983-03-08 Nippon Steel Corp 底吹き転炉の通気性耐火物保護方法
JPS5839719A (ja) * 1981-09-02 1983-03-08 Nippon Steel Corp 炉底ガス吹込ノズルの形成方法
JPS58167717A (ja) * 1982-03-29 1983-10-04 Nippon Kokan Kk <Nkk> 溶融金属精錬用ノズル
US4539043A (en) * 1982-03-29 1985-09-03 Nippon Kokan Kabushiki Kaisha Bottom-blown gas blowing nozzle
JPS58210112A (ja) * 1982-05-31 1983-12-07 Nippon Steel Corp ガス吹込みノズル
JPS5920418A (ja) * 1982-07-27 1984-02-02 Tokyo Yogyo Co Ltd Ｒｈ脱ガス装置の上昇浸漬管

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1957940B2 (de) * 1968-12-06 1978-06-29 Veitscher Magnesitwerke Ag, Wien Feuerfeste Auskleidung für öfen und Gefäße mit Dehnungsausgleich und Masse für eine solche Auskleidung
EP0021861A1 (fr) * 1979-04-25 1981-01-07 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Pièce réfractaire perméable aux gaz et son procédé de fabrication
EP0043338A1 (fr) * 1980-06-25 1982-01-06 Arbed S.A. Elément réfractaire perméable aux gaz
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz
EP0064449B1 (fr) * 1981-04-24 1984-11-28 Compagnie Francaise Des Aciers Speciaux Dispositif de soufflage de gaz de brassage dans un convertisseur d'affinage des métaux
GB2102926A (en) * 1981-06-03 1983-02-09 Nippon Kokan Kk Gas blowing nozzle, and production and usage thereof
EP0070197A1 (fr) * 1981-07-15 1983-01-19 Nippon Steel Corporation Arrangement de tuyères pour convertisseurs d'acierie à soufflage par le fond
GB2115539A (en) * 1982-02-24 1983-09-07 Didier Werke Ag Devices for introducing gases into metallurgical vessels
EP0095436A1 (fr) * 1982-05-25 1983-11-30 Arbed S.A. Pièces réfractaires perméables au gaz

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538498A1 (de) * 1985-10-30 1987-05-07 Didier Werke Ag Einduesvorrichtung fuer metallurgische gefaesse
EP0239152A1 (fr) * 1986-03-10 1987-09-30 Hoogovens Groep B.V. Système d'alimentation en gaz d'un convertisseur pour la fabrication d'acier
DE3625117C1 (en) * 1986-07-25 1987-11-26 Didier Werke Ag Gas-flushing cone
EP0282824A2 (fr) * 1987-03-19 1988-09-21 Arbed S.A. Dispositif pour vidanger des récipients métallurgiques
FR2612433A1 (fr) * 1987-03-19 1988-09-23 Arbed Dispositif pour vidanger des recipients metallurgiques
EP0282824A3 (fr) * 1987-03-19 1989-03-15 Arbed S.A. Dispositif pour vidanger des récipients métallurgiques
EP0311785A1 (fr) * 1987-10-14 1989-04-19 PA-HA-GE HÜTTEN UND GIESSEREIBEDARF GMBH &amp; CO. KG Brique de balayage pour récipients métallurgiques
DE3904543A1 (de) * 1988-05-13 1989-11-23 Insul Co Vorrichtung zum einfuehren von ruehrgas in geschmolzenes metall in dosierter menge
EP0467042A2 (fr) * 1990-07-19 1992-01-22 Veitsch-Radex Aktiengesellschaft Für Feuerfeste Erzeugnisse Procédé de fabrication d'un élément d'insufflation à porosité orientée et à résistance à l'infiltration pour récipients métallurgiques
EP0467042A3 (en) * 1990-07-19 1992-03-18 Radex-Heraklith Industriebeteiligungs Aktiengesellschaft Process for producing a gas purging brick with directional porosity and high infiltration resistance for metallurgical vessels
EP0525591A1 (fr) * 1991-07-29 1993-02-03 Tokyo Yogyo Kabushiki Kaisha Brique pour l'introduction de gaz dans un récipient à affiner le métal en fusion
WO1997018335A2 (fr) * 1995-11-14 1997-05-22 DÖTSCH, Marie-Luise Plaques-modeles refractaires dotees de canaux d'ecoulement de gaz
WO1997018335A3 (fr) * 1995-11-14 1997-08-28 Doetsch Marie Luise & Hf Plaques-modeles refractaires dotees de canaux d'ecoulement de gaz

Also Published As

Publication number Publication date
KR850004990A (ko) 1985-08-19
CA1247861A (fr) 1989-01-03
BR8406349A (pt) 1985-10-08
AU566336B2 (en) 1987-10-15
ES291744Y (es) 1987-03-01
JPS60149709A (ja) 1985-08-07
IN162802B (fr) 1988-07-09
EP0146079A3 (en) 1987-01-07
ZA849690B (en) 1985-07-31
DE3481527D1 (de) 1990-04-12
ATE50797T1 (de) 1990-03-15
ES291744U (es) 1986-05-01
LU85131A1 (de) 1985-09-12
EP0146079B1 (fr) 1990-03-07
US4647020A (en) 1987-03-03
AU3645584A (en) 1986-06-19

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