AT300639B - Delivery for metallurgical furnaces and vessels - Google Patents

Delivery for metallurgical furnaces and vessels

Info

Publication number
AT300639B
AT300639B AT660470A AT660470A AT300639B AT 300639 B AT300639 B AT 300639B AT 660470 A AT660470 A AT 660470A AT 660470 A AT660470 A AT 660470A AT 300639 B AT300639 B AT 300639B
Authority
AT
Austria
Prior art keywords
molten
cladding
stones
sep
contact
Prior art date
Application number
AT660470A
Other languages
German (de)
Original Assignee
Dynamit Nobel Ag
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 Dynamit Nobel Ag filed Critical Dynamit Nobel Ag
Priority to AT660470A priority Critical patent/AT300639B/en
Application granted granted Critical
Publication of AT300639B publication Critical patent/AT300639B/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
    • C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Description

  

   <Desc/Clms Page number 1> 
 
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Der Aufbau der erfindungsgemässen Ofenzustellung wird nachfolgend an Hand zweier in den Zeichnungen schematisch dargestellter Mittelfrequenz-Induktionsöfen des näheren erläutert. In den Zeichnungen zeigen :
Fig. 1 einen axialen Längsschnitt durch einen Mittelfrequenzofen mit einer Zustellung aus Stampfmasse und einer Plattierung ; Fig. 2 einen axialen Längsschnitt durch einen Mittelfrequenzofen, bei dem zwischen der Stampfmasse und der Plattierung eine Zwischenschicht angeordnet ist. 



   Der Ofen besteht in üblicher Weise aus einem Stahlmantel-l-und einer Induktionsspule-2-, die aus   kühlmitteldurchflossenen Kupferrohren besteht.   Der zylindrische Mantel aus der Spule und den Kühlmittelrohren wird mittels Glasfaser oder Asbest oder einer quarzhaltigen Masse ausgekleidet, so dass sich eine in etwa zylin- drische Innenfläche ergibt. Die   Ofenspule --2- steht   auf einem üblichen Bodenstein --5-- aus Schamotte mit einer Aufstampfung --6-- aus trockener Schmelzmagnesia. Auf den etwa ebenen Boden --5, 6-- wird eine er- ste   Ringlage-7-aus Schmelzoxyd-Formsteinen   aufgelegt und anschliessend der freie Raum zwischen der
Steinlage --7-- und der ausgekleideten Spule --2-- mit Schmelzmagnesia --8-- aufgestampft.

   Danach wird die nächste Steinlage-9-auf die erste   Steimage-7-gelegt   und wieder der Ringraum zwischen dieser
Steinlage und der Ofenspule mit Schmelzmagnesia aufgestampft. Auf diese Weise wird das gesamte Ofenfutter aufgebaut, wobei zwischen die einzelnen Steinlagen-7, 9- zum Ausgleich von Unebenheiten trockene Schmelzmagnesia mit einer Körnung unter 12 mm aufgestreut werden kann. Nach Fertigstellung der obersten Steinlage wird ein üblicher Kragenstein --10-- mit einer handfeuchten Mischung von Schmelzmagnesia und Wasserglas aufgestampft. 



   Die Stampfmasse kann auch aus feuerfesten   Stoffen --11-- bestehen,   die mit dem Kalk der Plattierung verhältnismässig niedrigschmelzende Eutektika bilden. In diesem Falle befindet sich zwischen der Stampfmasse   - -11-- und der Plattierung aus Schmelzkalk- oder Schmelzdolomitsteinen -7, 9--   eine Zwischenschicht-13aus Schmelzmagnesia oder stabilisiertem Zirkonoxyd. 



   Einein der vorbeschriebenen Weise aufgebaute Ofenzustellung besitzt im Gegensatz zu einer durch Stampfenhergestellten Zustellung bei demselben Schmelzprogramm auf Grund der hohen Beständigkeit der Plattierung gegenüber der Schmelze und der Schlacke eine zwei-bis dreifache Haltbarkeit, d. h. mit der erfindungsgemässen Zustellung konnten bis 60 Chargen erschmolzen werden. 



   Für das Schmelzen mit Frischschlacken und/oder unter Sauerstoffzufuhr besteht die Plattierung in dem mit derSchlacke in Berührung kommenden Bereich vorzugsweise aus Schmelzmagnesiasteinen ; ist die Frischwirkung der Schlacke nur gering, so kann die Schlackenzone aus Schmelzdolomitsteinen bestehen. 



   Die hochbasischen und hochfeuerfesten Tiegelzustellungen nach der Erfindung erschliessen dem Induktionsofen neue Anwendungsgebiete. So ermöglichen sie das Schmelzen unter Schlacken extrem hoher Basizität, die   niedrigsteSchwefelgehalte ergeben. Ausserdem verhindert der äusserst geringe   Sauerstoffpartialdruck des Schmelzkalkes trotz der hohen Temperaturen eine Sauerstoffaufnahme durch den Stahl und ergibt damit einen sehr geringen Abbrand der sauerstoffaffinen Legierungselemente. Demzufolge kann auch die Zugabe sauerstoffaffiner Legierungselemente im Ofen erfolgen, wo sich die Reaktionsprodukte besser absetzen als beim Zusatz während des Giessens in die Pfanne. Ausserdem eignet sich die Zustellung besonders für Vakuumöfen   und-Behälter.   



   Der erfindungsgemässe Vorschlag, die Ofenzustellung aus einer Plattierung und einer gestampften Hinterfüllung aufzubauen, gestattet die Ausnutzung der mit der Verwendung von Schmelzkalk-, Schmelzdolomit-,   Schmelzmagnesia-und Chrommagnesitsteinen verbundenen metallurgischen   Vorteile, die bislang wegen der geringen Haltbarkeit der Steine grosstechnisch nicht ausgenutzt werden konnten. 



    PATENTANSPRÜCHE :    
1. Zustellung für metallurgische Öfen und Gefässe, insbesondere für Induktionsöfen, aus Schmelzoxyden, dadurch gekennzeichnet, dass an der Innenseite des Ofenmantels bzw. der Auskleidung der Ofenspule eine aufgestampfte Schicht (8, 13) aus Schmelzmagnesia oder stabilisiertem Zirkonoxyd mit einer Plattierung (7, 9) aus Schmelzkalk-, Schmelzdolomit-, Chrommagnesit- oder Schmelzmagnesiasteinen vorgesehen ist.



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<tb> 2ff / o <SEP> 1 <SEP> to <SEP> 2 <SEP> mm
<tb> 251a <SEP> 2 <SEP> to <SEP> 4 <SEP> mm <SEP>
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 <Desc / Clms Page number 2>

 
The structure of the furnace lining according to the invention is explained in more detail below using two medium-frequency induction furnaces shown schematically in the drawings. In the drawings show:
1 shows an axial longitudinal section through a medium-frequency furnace with a feed made of ramming material and a cladding; 2 shows an axial longitudinal section through a medium-frequency furnace in which an intermediate layer is arranged between the ramming mass and the cladding.



   The furnace consists in the usual manner of a steel jacket-1 and an induction coil-2, which consists of copper pipes through which coolant flows. The cylindrical jacket consisting of the coil and the coolant pipes is lined with glass fiber or asbestos or a quartz-containing compound, so that an approximately cylindrical inner surface is obtained. The furnace coil --2- stands on a standard floor stone --5-- made of fireclay with a stamping --6-- made of dry fused magnesia. A first ring layer 7 made of molded enamel stones is placed on the roughly level floor --5, 6 - and then the free space between the
Stone layer --7-- and the lined coil --2-- stamped with fused magnesia --8--.

   Then the next stone layer-9-is placed on the first Steimage-7-and again the annular space between it
The stone layer and the furnace coil are stamped with fused magnesia. In this way, the entire furnace lining is built up, whereby dry fused magnesia with a grain size of less than 12 mm can be sprinkled between the individual stone layers-7, 9- to compensate for unevenness. After the top layer of stones has been completed, a standard collar stone --10 - is tamped on with a hand-damp mixture of fused magnesia and water glass.



   The rammed earth can also consist of refractory materials --11-- which form relatively low-melting eutectics with the lime in the cladding. In this case there is an intermediate layer -13 made of fused magnesia or stabilized zirconium oxide between the rammed earth - -11-- and the cladding of molten lime or molten dolomite stones -7, 9--.



   A furnace lining constructed in the manner described above has, in contrast to a lining produced by tamping with the same melting program, due to the high resistance of the cladding to the melt and the slag, a service life of two to three times, ie. H. With the lining according to the invention, up to 60 batches could be melted.



   For melting with fresh slag and / or with a supply of oxygen, the cladding in the area that comes into contact with the slag preferably consists of fused magnesia stones; if the fresh effect of the slag is only slight, the slag zone can consist of melted dolomite stones.



   The highly basic and highly refractory crucible linings according to the invention open up new areas of application for the induction furnace. In this way, they enable the melting under slags of extremely high basicity, which result in the lowest sulfur contents. In addition, the extremely low oxygen partial pressure of the molten lime prevents oxygen from being absorbed by the steel despite the high temperatures, and thus results in very little burn-off of the alloy elements with an affinity for oxygen. As a result, alloy elements with an affinity for oxygen can also be added in the furnace, where the reaction products settle better than when they were added during pouring into the ladle. The lining is also particularly suitable for vacuum ovens and containers.



   The proposal according to the invention to build the furnace lining from a cladding and a stamped backfill allows the use of the metallurgical advantages associated with the use of fused lime, fused dolomite, fused magnesia and chromium magnesite stones, which up to now could not be exploited on an industrial scale because of the low durability of the stones .



    PATENT CLAIMS:
1. Lining for metallurgical furnaces and vessels, in particular for induction furnaces, made of molten oxides, characterized in that on the inside of the furnace shell or the lining of the furnace coil a tamped layer (8, 13) made of fused magnesia or stabilized zirconium oxide with a plating (7, 9) made of molten lime, molten dolomite, chromium magnesite or fused magnesia stones is provided.

Claims (1)

2. Zustellung nach Anspruch 1, dadurch gekennzeichnet, dass sich zwischen der Innenseite des Ofenmantels bzw. der Ofenspule und einer gestampften Zwischenschicht (13) aus Schmelzmagnesia oder stabilisiertem Zirkonoxyd, auf welche die Plattierung (7, 9) folgt, zusätzlich eine gestampfte Schicht (11) aus Quarzit, Korund, Mullit oder Spinell befindet. 2. A lining according to claim 1, characterized in that between the inside of the furnace jacket or the furnace coil and a tamped intermediate layer (13) made of fused magnesia or stabilized zirconium oxide, which is followed by the plating (7, 9), there is also a tamped layer ( 11) made of quartzite, corundum, mullite or spinel. 3. Zustellung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Plattierung (7, 9) in dem mit der Metallschmelze in Berührung stehenden Teil aus Schmelzkalksteinen und in dem mit der Schlacke in Berührung stehenden Teil aus Schmelzdolomitsteinen besteht. 3. A lining according to claim 1 or 2, characterized in that the cladding (7, 9) in the part in contact with the molten metal consists of molten limestone and in the part in contact with the slag consists of molten dolomite stones. 4. Zustellung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Plattierung (7, 9) im mit der Metallschmelze in Berührung stehenden Teil aus Schmelzkalk- oder Schmelzdolomitsteinen und im mit der Schlacke in Berührung stehenden Teil aus Schmelzmagnesiasteinen besteht. EMI2.1 <Desc/Clms Page number 3> dass- 4 - Nr. 300639 6. ZustellungnachAnspruch 5, dadurch gekennzeichnet, dass die gestampfte Schicht (8, 13) folgenden Komaufbau in Gew. -% bestitzt: 3 coo bis 0, 12 mm EMI3.1 die Fugen zwischen den Steinen der Plattierung (7, 9) mit trockener Schmelzmagnesia einer Körnung unter 0, 12 mm ausgestreut sind. 4. A lining according to claim 1 or 2, characterized in that the cladding (7, 9) in the part in contact with the molten metal consists of molten lime or molten dolomite stones and in the part in contact with the slag consists of fused magnesia stones. EMI2.1 <Desc / Clms Page number 3> that- 4 - No. 300639 6. Delivery according to Claim 5, characterized in that the tamped layer (8, 13) has the following grain structure in% by weight: 3 coo to 0.12 mm EMI3.1 the joints between the stones of the cladding (7, 9) are strewn with dry fused magnesia with a grain size of less than 0.12 mm. 8. Zustellung nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Dicke der Plattierung (7,9) mindestens 40 mm beträgt. 8. Delivery according to one or more of claims 1 to 7, characterized in that the thickness of the cladding (7, 9) is at least 40 mm.
AT660470A 1970-07-20 1970-07-20 Delivery for metallurgical furnaces and vessels AT300639B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT660470A AT300639B (en) 1970-07-20 1970-07-20 Delivery for metallurgical furnaces and vessels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT660470A AT300639B (en) 1970-07-20 1970-07-20 Delivery for metallurgical furnaces and vessels

Publications (1)

Publication Number Publication Date
AT300639B true AT300639B (en) 1972-08-10

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Family Applications (1)

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AT660470A AT300639B (en) 1970-07-20 1970-07-20 Delivery for metallurgical furnaces and vessels

Country Status (1)

Country Link
AT (1) AT300639B (en)

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