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EP0071047B1 - Process for making cast pieces with inserted steel tubes - Google Patents

Process for making cast pieces with inserted steel tubes Download PDF

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Publication number
EP0071047B1
EP0071047B1 EP82106016A EP82106016A EP0071047B1 EP 0071047 B1 EP0071047 B1 EP 0071047B1 EP 82106016 A EP82106016 A EP 82106016A EP 82106016 A EP82106016 A EP 82106016A EP 0071047 B1 EP0071047 B1 EP 0071047B1
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EP
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Prior art keywords
steel
tube
cast
process according
shells
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Expired
Application number
EP82106016A
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German (de)
French (fr)
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EP0071047A2 (en
EP0071047A3 (en
Inventor
Heinz-Ludwig Ing. grad. Bücking
Christoph Ing. Grad. Knoche
Wilhelm Sieweke
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Hoesch AG
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Hoesch AG
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Priority to AT82106016T priority Critical patent/ATE13497T1/en
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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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0072—Casting in, on, or around objects which form part of the product for making objects with integrated channels
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the invention relates to a process for the production of castings with cast steel pipes, preferably cooling elements for a metallurgical furnace, the castings being made of cast steel and the steel pipes being cast with an overheated cast steel melt and being filled with a granular, highly heat-conductive, refractory material before the casting.
  • DE-A-2 903 104 already discloses a cooling element for a metallurgical furnace, in particular a blast furnace, with cooling element-guiding pipes made of steel cast into a cast body and a refractory lining which is anchored in the furnace-side end face of the cooling element in recesses running parallel to the broad side of the cooling element is, bekar nt, wherein the cast body is made of cast steel and the superheating heat of the liquid cast steel body is arranged at a distance from the cooling pipes to be cast.
  • the cooling tubes are filled with high-melting, granular material with high thermal conductivity before the encapsulation.
  • Zirconium oxide, chromium oxide or a mixture with a proportion of more than 20% of these oxides is used as the granular material. If cooling elements are produced according to this known method, some of the cast-in pipes which are intended to carry the cooling liquid, as practice has shown, have leaks.
  • the invention has for its object to provide a method of the type mentioned, in which the disadvantages of the known methods are avoided and by means of which, in particular, the cooling tubes made of steel are embedded in the cast body.
  • the granular material used individually or in a mixture of magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC, Si 3 N «is used as the pipe filler and the steel pipes to be poured in are full on the pipe surface overlying pipe segments or pipe shells made of steel, the steel pipe segments or steel pipe shells cover one third to one half of the steel pipe surface, the pipe segments or shells are only placed on the cast top and only a minimal air gap remains between the steel pipe surface and steel pipe segments or shells.
  • Mixtures of fired magnesite with up to 30% each of an addition of one or more other granular materials as tube filler are preferably used as the granular material.
  • the fired magnesite ⁇ 75% MgO, preferably ⁇ 90% MgO, the chromite ⁇ 30% Cr 2 0 3 , preferably ⁇ 40% Cr 2 0 3 , the corundum and the sintered alumina ⁇ 90% A1 2 0 should preferably be used as the composition of the pipe filler 3 , preferably ⁇ 95% A1 2 0 3 contain and the materials obtained in a natural or synthetic way should be typical impurities, such.
  • the granular tube filler has the most dense spherical packing possible due to its grain size composition. H. that a minimal void fraction is present, which would significantly reduce the otherwise high thermal conductivity of the materials used according to the invention.
  • the grain size of the pipe filler is between 0 and 3 mm, preferably between 0 and 1 mm.
  • composition of the cast steel melts to be used in the process can vary depending on the intended use within the limits specified below, since in addition to unalloyed ones high-alloy cast steel, e.g. B. can be used for heat-resistant and / or scale-resistant castings:
  • ventilation bores in the steel pipe segments or shells and beveled edges cause optimal casting gas discharge and facilitate the formation of a small air gap between the pipe to be poured in and the steel pipe segments or shells placed thereon.
  • FIG. 1 shows a cast body in section
  • FIG. 2 shows a section on an enlarged scale according to II-II in FIG. 1.
  • a steel tube 2 is inserted, which with a thin surface coating 3 (Fig. 2), for. B. from A1 2 0 3 , is coated.
  • the steel tube is filled with a sintered magnesite 4 with a grain size of 0-0.5 mm.
  • the table shows the chemical composition and grain size distribution of the sintered magnesite.
  • the cast body 1 surrounding the steel tube 2 has the following chemical composition:
  • the casting temperature is approx. 1520-1550 ° C.
  • the steel pipe to be poured corresponds to the material St 35.8 / 11 according to DIN 17 175.
  • Fig. 2 shows in detail the steel pipe 2 to be poured in with its approximately 50-200 ⁇ m thick coating 3, the pipe filler 4 and a steel pipe shell 5 placed thereon, which is provided with bores 6 and bevels on the edges 7.
  • the steel pipe shell 5 includes the periphery of the steel pipe 2 is about 1/3 and is located, as shown in Fig. 1 shows, at the position denoted by "a" Gußobenseite.
  • the thickness of the steel tube shell 5 corresponds approximately to that of the steel tube to be cast, namely approximately 8 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Braking Arrangements (AREA)
  • Ceramic Products (AREA)
  • Mold Materials And Core Materials (AREA)
  • Glass Compositions (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)

Abstract

The invention provides a method and a set-up for production of castings containing cast-in steel tubes, preferably to provide cooling elements for metallurgical furnaces. The castings are from cast steel and the steel tubes are cast-in with a superheated cast steel melt. Before the casting the tubes are filled with a granular, highly thermal conductive, refractory material. In order to assure that the cast-in steel or respectively cooling tubes remain free from leaks, the invention provides to employ as a filling material one or more of the materials: burned magnesite (sintered magnesite), corundum, sintered aluminum oxide, chromite, silicon carbide, silicon nitride.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, vorzugsweise Kühlelemente für einen metallurgischen Ofen, wobei die Gußkörper aus Stahlguß bestehen und die Stahlrohre mit einer überhitzten Stahlgußschmelze umgossen und vor dem Umgießen mit einem körnigen, hochwärmeleitfähigen feuerfesten Material verfüllt werden.The invention relates to a process for the production of castings with cast steel pipes, preferably cooling elements for a metallurgical furnace, the castings being made of cast steel and the steel pipes being cast with an overheated cast steel melt and being filled with a granular, highly heat-conductive, refractory material before the casting.

Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, die z. B. als Kühlelemente für die Wände von metallurgischen Öfen, z. B. Hochöfen, Verwendung finden, sind bekannt. Für die Kühlelemente wird als Gußwerkstoff üblicherweise Grauguß mit unterschiedlichster Graphitausbildung verwendet. Der Werkstoff, aus dem die Kühlrohre hergestellt werden, weist je nach Funktion eine definierte Stahlzusammensetzung auf (vgl. DE-B1-2 719 165, DE-A-3 013 560). Aufgrund der unterschiedlichen Liquidustemperaturen von Grauguß und Stahlrohrwerkstoff treten beim Umgießen der Stahlrohre mit Grauguß in einem solchermaßen aufgebauten Kühlelement keine nennenswer ten gießtechnischen Probleme auf. Die zu umgießenden Stahlrohre benötigen normalerweise keinen Rohrfüllstoff; sie sind jedoch in jedem Falle gegen Aufkohlung auf der Außenseite durch eine geeignete Beschichtung zu schützen.Process for the production of castings with cast steel pipes, which, for. B. as cooling elements for the walls of metallurgical furnaces, for. B. blast furnaces, are known. For the cooling elements, gray cast iron with a wide variety of graphite designs is usually used as the casting material. Depending on the function, the material from which the cooling tubes are made has a defined steel composition (cf. DE-B1-2 719 165, DE-A-3 013 560). Due to the different liquidus temperatures of gray cast iron and steel pipe material, no significant casting problems occur when the steel pipes are cast with gray cast iron in a cooling element constructed in this way. The steel pipes to be cast normally do not require any pipe filler; however, they must be protected against carburizing on the outside by a suitable coating.

Aus DE-A-2 903 104 ist bereits ein Kühlelement für einen metallurgischen Ofen, insbesondere Hochofen, mit in einen Gußkörper eingegossenen kühlelementführenden Rohren aus Stahl und einer feuerfesten Auskleidung, die in der ofenseitigen Stirnfläche des Kühlelementes in parallel zur Breitseite des Kühlelementes verlaufenden Ausnehmungen verankert ist, bekar nt, wobei der Gußkörper aus Stahlguß besteht und im Abstand von den zu umgießenden Kühlrohren die Überhitzungswärme des flüssigen Stahlgusses aufnehmende Körper angeordnet sind. Zur Herstellung dieser Kühlelemente werden die Kühlrohre vor dem Umgießen mit hochschmelzenden, eine hohe Wärmeleitfähigkeit aufweisenden körnigen Material gefüllt. Als körniges Material wird dabei Zirkonoxid, Chromoxid oder ein Gemenge mit einem Anteil von mehr als 20% dieser Oxide verwendet. Werden Kühlelemente nach diesem bekannten Verfahren hergestellt, so weist ein Teil der eingegossenen Rohre, die die Kühlflüssigkeit führen sollen, wie die Praxis gezeigt hat, Undichtigkeiten auf.DE-A-2 903 104 already discloses a cooling element for a metallurgical furnace, in particular a blast furnace, with cooling element-guiding pipes made of steel cast into a cast body and a refractory lining which is anchored in the furnace-side end face of the cooling element in recesses running parallel to the broad side of the cooling element is, bekar nt, wherein the cast body is made of cast steel and the superheating heat of the liquid cast steel body is arranged at a distance from the cooling pipes to be cast. To produce these cooling elements, the cooling tubes are filled with high-melting, granular material with high thermal conductivity before the encapsulation. Zirconium oxide, chromium oxide or a mixture with a proportion of more than 20% of these oxides is used as the granular material. If cooling elements are produced according to this known method, some of the cast-in pipes which are intended to carry the cooling liquid, as practice has shown, have leaks.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, bei dem die Nachteile der bekannten Verfahren vermieden werden und mittels dessen insbesondere die in die Gußkörper eingelassenen Kühlrohre aus Stahl dicht sind.The invention has for its object to provide a method of the type mentioned, in which the disadvantages of the known methods are avoided and by means of which, in particular, the cooling tubes made of steel are embedded in the cast body.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß als körniges Material einzeln oder zu mehreren als Gemisch gebrannter Magnesit (Sintermagnesit), Korund, Sintertonerde, Chromit, SiC, Si3N« als Rohrfüllstoff verwendet wird und die einzugießenden Stahlrohre mit auf der Rohroberfläche satt aufliegenden Rohrsegmenten oder Rohrschalen aus Stahl versehen werden, die Stahlrohrsegmente oder Stahlrohrschalen ein Drittel bis eine Hälfte der Stahlrohroberfläche bedecken, die Rohrsegmente oder -schalen nur auf der Gußoberseite aufgelegt werden und zwischen Stahlrohroberfläche und Stahlrohrsegmenten oder -schalen nur ein minimaler Luftspalt verbleibt. In bevorzugter Weise werden als körniges Material Mischungen aus gebranntem Magnesit mit bis zu je 30% eines Zusatzes eines oder mehrerer anderer körniger Materialien als Rohrfüllstoff verwendet. Mit Vorteil ist ferner eine Mischung von technisch reinem SiC und Si3N4 in beliebigem Mischungsverhältnis als Rohrfüllstoff zu verwenden. Als Zusammensetzung des Rohrfüllstoffes soll bevorzugterweise der gebrannte Magnesit ≥75% MgO, vorzugsweise ≥90% MgO, der Chromit ≥30% Cr203, vorzugsweise ≥40% Cr203, der Korund und die Sintertonerde ≥90% A1203, vorzugsweise ≥95% A1203 enthalten und die auf natürliche oder synthetische Art gewonnenen Materialien sollen als Rest typische Verunreinigungen, z. B. an Si02, AI203, CaO, MgO, Fe203/FeO in möglichst geringer Menge aufweisenThis object is achieved according to the invention in that the granular material used individually or in a mixture of magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC, Si 3 N «is used as the pipe filler and the steel pipes to be poured in are full on the pipe surface overlying pipe segments or pipe shells made of steel, the steel pipe segments or steel pipe shells cover one third to one half of the steel pipe surface, the pipe segments or shells are only placed on the cast top and only a minimal air gap remains between the steel pipe surface and steel pipe segments or shells. Mixtures of fired magnesite with up to 30% each of an addition of one or more other granular materials as tube filler are preferably used as the granular material. It is also advantageous to use a mixture of technically pure SiC and Si 3 N 4 in any mixing ratio as the tube filler. The fired magnesite ≥75% MgO, preferably ≥90% MgO, the chromite ≥30% Cr 2 0 3 , preferably ≥40% Cr 2 0 3 , the corundum and the sintered alumina ≥90% A1 2 0 should preferably be used as the composition of the pipe filler 3 , preferably ≥95% A1 2 0 3 contain and the materials obtained in a natural or synthetic way should be typical impurities, such. B. on Si0 2 , Al 2 0 3 , CaO, MgO, Fe 2 0 3 / FeO in the smallest possible amount

Mit Vorteil weist ferner der körnige Rohrfüllstoff von seiner Korngrößenzusammensetzung her eine möglichst dichte Kugelpackung auf, d. h. daß ein minimaler Hohlraumanteil vorhanden ist, der die ansonsten hohe Wärmeleitung der erfindungsgemäß eingesetzten Materialien deutlich erniedrigen würde. Zu diesem Zweck liegt die Körnung des Rohrfüllstoffes zwischen 0 bis 3 mm, vorzugsweise zwischen 0 bis 1 mm.Advantageously, the granular tube filler has the most dense spherical packing possible due to its grain size composition. H. that a minimal void fraction is present, which would significantly reduce the otherwise high thermal conductivity of the materials used according to the invention. For this purpose, the grain size of the pipe filler is between 0 and 3 mm, preferably between 0 and 1 mm.

Zur Erzielung einer guten Verdichtung des Rohrfüllstoffes innerhalb der einzugießenden Stahlrohre im trockenen oder feucht bis flüssigen Zustand ist neben den zu treffenden körnungstechnischen Maßnahmen der Zusatz von die Fließfähigkeit positiv beeinflussenden Mitteln, wie sie z. B. auch in der grob- und feinkeramischen Industrie zum Einsatz gelangen, angezeigt. In weiterer Ausbildung der Erfindung werden daher dem Rohrfüllstoff organische und/oder anorganische Dispergier-, Verflüssigungs-, Plastifizierungsmittel, Binder sowie andere, in der keramischen Industrie bekannte, chemische Mittel mit ähnlicher Wirkung zugesetzt.To achieve a good compression of the pipe filler within the steel pipes to be poured in the dry or moist to liquid state, in addition to the granular measures to be taken, the addition of agents which positively influence the flowability, such as, for. B. also used in the coarse and fine ceramic industry. In a further embodiment of the invention, organic and / or inorganic dispersants, liquefiers, plasticizers, binders and other chemical agents known in the ceramic industry with a similar effect are therefore added to the pipe filler.

Die Vorteile des erfindungsgemäßen Verfahrens sind insbesondere darin zu sehen, daß nunmehr durchgehend dichte Kühlrohre in den Gußkörpern vorliegen, da der in die Stahlrohre eingefüllte Rohrfüllstoff bei der herrschenden Gießtemperatur für unlegierten bis hochlegierten Stahlguß, die üblicherweise 20-100'C oberhalb der Liquidustemperatur liegt, kaum schwindet oder sintert, der Kornaufbau eine gute Verdichtung ermöglicht und nicht oder nur unwesentlich zur Auf- oder Entkohlung des Stahlrohrwerkstoffes führt.The advantages of the method according to the invention can be seen in particular in the fact that there are now continuously sealed cooling tubes in the castings, since the tube filler filled into the steel tubes at the prevailing casting temperature for unalloyed to high-alloy steel casting, which is usually 20-100'C above the liquidus temperature, hardly shrinks or sinters, the grain structure enables good compaction and does not, or only insignificantly, lead to carburizing or decarburization of the steel tube material.

Die Zusammensetzung der bei dem Verfahren einzusetzenden Stahlgußschmelzen kann je nach Verwendungszweck in den nachfolgend angegebenen Grenzen variieren, da neben unlegiertem auch hochlegierter Stahlguß, z. B. für warmfeste und/oder zunderbeständige Gußteile zum Einsatz gelangen kann:

Figure imgb0001
The composition of the cast steel melts to be used in the process can vary depending on the intended use within the limits specified below, since in addition to unalloyed ones high-alloy cast steel, e.g. B. can be used for heat-resistant and / or scale-resistant castings:
Figure imgb0001

Rest Eisen und unvermeidliche VerunreinigungenBalance iron and inevitable impurities

In Weiterbildung des erfindungsgemäßen Verfahrens bewirken Entlüftungsbohrungen in den Stahlrohrsegmenten oder -schalen sowie Kantenabschrägungen eine optimale Gießgasableitung und erleichtern die Bildung eines geringen Luftspaltes zwischen einzugießendem Rohr und aufgelegten Stahlrohrsegmenten oder -schalen.In a further development of the method according to the invention, ventilation bores in the steel pipe segments or shells and beveled edges cause optimal casting gas discharge and facilitate the formation of a small air gap between the pipe to be poured in and the steel pipe segments or shells placed thereon.

Die Erfindung ist im folgenden anhand eines bevorzugten Ausführungsbeispiels näher erläutert, wobei Fig. 1 einen Gußkörper im Schnitt und Fig. 2 einen Schnitt in vergrößertem Maßstab nach II-II in Fig. 1 zeigen.The invention is explained in more detail below with reference to a preferred exemplary embodiment, in which FIG. 1 shows a cast body in section and FIG. 2 shows a section on an enlarged scale according to II-II in FIG. 1.

In eine Gießform, die zum Abguß des in Fig. 1 dargestellten Gußkörpers 1 bestimmt ist, wird ein Stahlrohr 2 eingelegt, das mit einer dünnen Oberflächenbeschichtung 3 (Fig. 2), z. B. aus A1203, überzogen ist. Das Stahlrohr ist mit einem Sintermagnesit 4 der Körnung 0-0,5 mm dicht verfüllt. In der Tabelle ist die chemische Zusammensetzung und Korngrößenverteilung des Sintermagnesits aufgeführt.In a casting mold, which is intended to cast the cast body 1 shown in Fig. 1, a steel tube 2 is inserted, which with a thin surface coating 3 (Fig. 2), for. B. from A1 2 0 3 , is coated. The steel tube is filled with a sintered magnesite 4 with a grain size of 0-0.5 mm. The table shows the chemical composition and grain size distribution of the sintered magnesite.

Chemische ZusammensetzungChemical composition

Figure imgb0002
Figure imgb0002

KorngrößenverteilungGrain size distribution

Figure imgb0003
Figure imgb0003

Der das Stahlrohr 2 umgebende Gußkörper 1 hat folgende chemische Zusammensetzung:

Figure imgb0004
The cast body 1 surrounding the steel tube 2 has the following chemical composition:
Figure imgb0004

Die Gießtemperatur beträgt ca. 1520-1550° C.The casting temperature is approx. 1520-1550 ° C.

Das einzugießende Stahlrohr entspricht dem Werkstoff St 35.8/11 gemäß DIN 17 175.The steel pipe to be poured corresponds to the material St 35.8 / 11 according to DIN 17 175.

Fig. 2 zeigt im Detail das einzugießende Stahlrohr 2 mit seiner ca. 50-200 µm starken Beschichtung 3, dem Rohrfüllstoff 4 und einer aufgelegten Stahlrohrschale 5, die mit Bohrungen 6 und Abschrägungen an den Kanten 7 versehen ist. Die Stahlrohrschale 5 umfaßt etwa 1/3 des Umfanges des Stahlrohres 2 und befindet sich, wie aus Fig. 1 hervorgeht, auf der mit »a« bezeichneten Gußobenseite. Die Stärke der Stahlrohrschale 5 entspricht im bevorzugten Ausführungsbeispiel etwa der des einzugießenden Stahlrohres, nämlich etwa 8 mm.Fig. 2 shows in detail the steel pipe 2 to be poured in with its approximately 50-200 μm thick coating 3, the pipe filler 4 and a steel pipe shell 5 placed thereon, which is provided with bores 6 and bevels on the edges 7. The steel pipe shell 5 includes the periphery of the steel pipe 2 is about 1/3 and is located, as shown in Fig. 1 shows, at the position denoted by "a" Gußobenseite. In the preferred embodiment, the thickness of the steel tube shell 5 corresponds approximately to that of the steel tube to be cast, namely approximately 8 mm.

Claims (8)

1. Process for the production of cast bodies (1) with embedded steel tubes (2), preferably cooling elements for a metallurgical furnace, in which the cast body (1) comprises cast steel and the steel tubes (2) are cast in with a superheated steel casting melt and, before being cast in, are filled with a particulate refractory material (4) of high thermal conductivity, characterised in that, as the particulate material (4), one or a mixture of several of dead-burned magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC and SisN4 is used as the tube-filling material and the steel tubes (2) to be embedded are provided on the surface with closely-fitting tube segments or tube shells (5) of steel, the steel tube segments or steel tube shells (5) covering a third to a half of the surfaces (2) of the steel tubes, the tube segments or shells (5) being laid only on the upper side and only a minimal air space remaining between the surface (2) of the steel tube and the tube segments or shells (5).
2. Process according to claim 1, characterised in that, as the particulate material, mixtures of sintered magnesite each with up to 30% of an addition of one or several particulate materials, are used as the tube-filling material.
3. Process according to claims 1 and 2, characterised in that a mixture of technically pure SiC and SisN4 in any proportions is used as the tube-filling material.
4. Process according to claims 1 to 3, characterised in that the sintered magnesite contains ≥75% MgO, preferably ≥90% MgO, the chromite contains ≥30% Cr203, preferably ≥400% Cr203. the corundum and the alumina contain ≥ 90% Al2O3, preferably ≥ 95% Al2O3, and the remaining naturally-or synthetically-obtained materials contain the least possible amounts of typical impurity materials, for example Si02, A1203, CaO and Fe203/FeO.
5. Process according to claims 1 to 4, characterised in that the particle size of the tube-filling material lies between 0 and 3 mm, preferably between 0 and 1 mm.
6. Process according to claims 1 to 5, characterised in that organic and/or inorganic dispersing, fluidising or plasticising agents, binders as well as other chemical materials with similar effects known in the ceramic industry are added.
7. Process according to claim 1, characterised in that the wall thickness of the overlying steel tube segments or steel tube shells (5) is from half to three times that of the steel tubes (2) to be embedded.
8. Process according to claim 1, characterised in that the steel segments or steel tube shells (5) are provided with apertures (6) and bevels (7).
EP82106016A 1981-07-25 1982-07-06 Process for making cast pieces with inserted steel tubes Expired EP0071047B1 (en)

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Application Number Priority Date Filing Date Title
AT82106016T ATE13497T1 (en) 1981-07-25 1982-07-06 PROCESS FOR THE MANUFACTURE OF CASTINGS WITH CAST-IN STEEL PIPES.

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DE3129391A DE3129391C1 (en) 1981-07-25 1981-07-25 Process for the production of castings with cast steel tubes
DE3129391 1981-07-25

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EP0071047A2 EP0071047A2 (en) 1983-02-09
EP0071047A3 EP0071047A3 (en) 1983-06-15
EP0071047B1 true EP0071047B1 (en) 1985-05-29

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JP (1) JPS5865565A (en)
AT (1) ATE13497T1 (en)
AU (1) AU554448B2 (en)
BR (1) BR8203636A (en)
CA (1) CA1196767A (en)
DD (1) DD207344A1 (en)
DE (2) DE3129391C1 (en)
ES (2) ES512334A0 (en)
MX (1) MX159651A (en)
PL (1) PL139752B1 (en)
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DE19647069A1 (en) * 1996-11-14 1998-05-20 Heidelberger Druckmasch Ag Hollow cast body e.g. printing machine cylinder preform

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FR2558084B1 (en) * 1984-01-17 1988-04-15 Renault BI-METALLIC FOUNDRY PIECE
SE453968B (en) * 1985-02-01 1988-03-21 Kanthal Ab CASTED METAL BODY AND SET TO MAKE IT SAME
US4958537A (en) * 1990-02-20 1990-09-25 Saturn Corporation Transmission casing cover with tubular conduit cast in situ
US5111872A (en) * 1990-02-20 1992-05-12 Saturn Corporation Transmission casing cover with tubular mechanically crimped conduit cast in situ
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AU554448B2 (en) 1986-08-21
JPS6245019B2 (en) 1987-09-24
DE3263883D1 (en) 1985-07-04
DE3129391C1 (en) 1982-11-04
MX159651A (en) 1989-07-24
JPS5865565A (en) 1983-04-19
BR8203636A (en) 1983-06-14
ZA824950B (en) 1983-04-27
EP0071047A2 (en) 1983-02-09
PL139752B1 (en) 1987-02-28
ATE13497T1 (en) 1985-06-15
CA1196767A (en) 1985-11-19
ES8402189A1 (en) 1984-01-16
EP0071047A3 (en) 1983-06-15
ES521488A0 (en) 1984-01-16
ES8307558A1 (en) 1983-07-01
AU8554282A (en) 1983-02-03
DD207344A1 (en) 1984-02-29
US4832106A (en) 1989-05-23
ES512334A0 (en) 1983-07-01
PL237599A1 (en) 1983-05-23

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