EP0071047A2 - Process for making cast pieces with inserted steel tubes - Google Patents
Process for making cast pieces with inserted steel tubes Download PDFInfo
- Publication number
- EP0071047A2 EP0071047A2 EP82106016A EP82106016A EP0071047A2 EP 0071047 A2 EP0071047 A2 EP 0071047A2 EP 82106016 A EP82106016 A EP 82106016A EP 82106016 A EP82106016 A EP 82106016A EP 0071047 A2 EP0071047 A2 EP 0071047A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- cast
- pipe
- shells
- castings
- 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
Links
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 30
- 229910001208 Crucible steel Inorganic materials 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 13
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 11
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 11
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 11
- 239000008187 granular material Substances 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000000161 steel melt Substances 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 239000010431 corundum Substances 0.000 claims abstract description 5
- -1 chromite Inorganic materials 0.000 claims abstract description 3
- 239000011819 refractory material Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims 3
- 229910052581 Si3N4 Inorganic materials 0.000 abstract 1
- 229910001060 Gray iron Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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, the castings made of cast steel and the steel pipes cast with an overheated cast steel melt and filled with a granular, highly heat-conductive refractory material before casting.
- 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 as a mixture of magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC, Si 3 N 4 is used as the pipe filler.
- 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 tube filler.
- composition of the tube filler should preferably the calcined magnesite ⁇ 75% MgO, preferably ⁇ 90% MgO, the chromite ⁇ 3 0% Cr 2 0 31, preferably ⁇ 40% Cr 2 0 3, the corundum and the sintered alumina ⁇ 90% Al 2 Contain O 3 , preferably ⁇ 95% Al 2 O 3 and the materials obtained in a natural or synthetic way are said to be typical impurities as the remainder eg on Si0 2 , Al 2 O 3 , CaO, M g O, Fe 2 0 3 / Fe0 in the smallest possible amount.
- the granular tube filler has the most dense spherical packing possible due to its grain size composition, i.e. 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 to 3 mm, preferably between 0 to 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 and high-alloy cast steel, for example for heat-resistant and / or scale-resistant castings can be used.
- the above-mentioned object is achieved in a process for the production of castings with cast-in steel pipes, the castings being made of cast steel and the steel pipes being cast with an overheated cast steel melt, so that the steel pipes to be poured in are provided with pipe segments which lie snugly on the pipe surface or Pipe shells made of steel are provided so that only a minimal air gap remains between the steel pipe surface and steel pipe segments or shells.
- the steel pipe segments or steel pipe shells only cover 1/3 - 1/2 of the steel pipe surface and are only placed on the upper side of the casting.
- the wall thickness of the steel pipe segments or steel pipe shells to be placed is expediently 1/2 to 3 times that of the pipes to be cast in.
- 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. made of Al 2 O 3 .
- the steel tube is filled with a sintered magnesite 4 with a grain size of 0.5 mm.
- the cast body 1 surrounding the steel tube 2 has the following chemical composition:
- the casting temperature is approx. 152 0 - 155 ° C.
- the steel pipe to be poured corresponds to material St 35.8 / II according to DIN 17 175.
- Fig. 2 shows in detail the steel pipe 2 to be poured in with its approx. 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 tubular steel shell 5 comprises approximately 1/3 of the circumference of the tubular steel 2 and, as can be seen from FIG. 1, is located on the upper side of the casting marked "a".
- the thickness of the steel tube shell 5 corresponds approximately to that of the steel tube to be poured in, namely approximately 8 mm.
Landscapes
- 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)
- Ceramic Products (AREA)
- Continuous Casting (AREA)
- Braking Arrangements (AREA)
- Glass Compositions (AREA)
- Mold Materials And Core Materials (AREA)
- Furnace Details (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, vorzugsweise von Kühlelementen 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, um zu vermeiden, daß Undichtigkeiten bei den eingelassenen Stahlrohren auftreten, wird als körniges Material einzeln oder zu mehreren ein Gemisch aus gebranntem Magnesit (Sintermagnesit), Korund, Sintertonerde, Chromit, SiC, Si3N4 als Rohrfüllstoff verwendet. Vorzugsweise werden ferner die einzugießenden Stahlrohre mit auf der Rohroberfläche satt aufliegenden Rohrsegmenten oder Rohrschalen aus Stahl versehen, so daß zwischen Stahlrohroberfläche und Stahlrohrsegmenten oder -schalen nur ein minimaler Luftspalt verbleibt.The invention relates to a process for the production of castings with cast-in steel tubes, preferably cooling elements for a metallurgical furnace, wherein the castings consist of cast steel and the steel pipes are cast with an overheated cast steel melt and, before being cast, with a granular, highly heat-conductive refractory material are filled in order to prevent leaks in the embedded steel pipes, a mixture of burned magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC, Si3N4 is used as the pipe filler as the granular material individually or in groups. Preferably, the steel pipes to be poured in are provided with pipe segments or pipe shells made of steel that lie snugly on the pipe surface, so that only a minimal air gap remains between the steel pipe surface and steel pipe segments or shells.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, 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, the castings made of cast steel and the steel pipes cast with an overheated cast steel melt and filled with a granular, highly heat-conductive refractory material before casting.
Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, die z.B. als Kühlelemente für die Wände von metallurgischen öfen, z.B. Höchöfen, Verwendung finden, sind bekannt. Für die Kühlelemente wird als Gußwerkstoff üblicherweise Grauguß mit unterschiedlichster Grafitausbildung verwendet. Der Werkstoff, aus dem die Kühlrohre hergestellt werden, weist je nach Funktion eine definierte Stahlzusammensetzung auf (vgl. DE-AS 27 19 165, DE- 3o 13 560, A 1). Aufgrund der unterschiedlichen Liquidustemperaturen von Grauguß und Stahlrohrwerkstoff treten beim Umgießen der Stahlrohre mit Grauguß in einem solchermaßen aufgebauten Kühlelement keine nennenswerten gießtechnischen Probleme auf. Die zu umgießenden Stahlrohre benötigen normaler Weise keinen Rohrfüllstoff; sie sind jedoch in jedem Fall gegen Aufkohlung auf der Außenseite durch eine geeignete Beschichtung zu schützen.Processes for the production of castings with cast-in steel tubes, which are used, for example, as cooling elements for the walls of metallurgical furnaces, for example Höchst furnaces, are known. For the cooling elements, gray cast iron with a wide variety of graphite designs is usually used as the casting material. The material from which the cooling tubes are made has a defined steel composition depending on the function (cf. DE-AS 27 19 165, DE-3o 13 56 0 , A 1). Because of the different liquidus temperatures of gray cast iron and steel pipe material, no significant casting problems arise when the steel pipes are cast with gray cast iron in such a cooling element. The steel pipes to be cast normally do not require any pipe filler; however, they must be protected against carburization on the outside by a suitable coating.
Wird jedoch anstelle von Grauguß Stahlguß als Gußwerkstoff verwendet, so.wie in der DE-OS 29 o3 lo4 für ein Kühlelement für einen metallurgischen Ofen beschrieben, so ergeben sich für das Umgießen von Rohren aus Stahl erhebliche gießtechnische und metallurgische Probleme. Zur Beseitigung dieser Probleme wird in der genannten DE-OS vorgeschlagen, Körper aus Stahl oder Stahlguß zwischen den Kühlrohren anzuordnen, die die Uberhitzungswärme des flüssigen Stahlgusses aufnehmen sollen. Ferner sollen die Kühlrohre nach dem Stand der Technik vor dem Umgießen mit flüssigem Stahlguß mit einem hochschmelzenden, eine hohe Wärmeleitfähigkeit aufweisenden körnigen Material gefüllt werden. Als körniges Material ist dabei Zirkonoxid und Chromoxid oder ein Gemenge dieser Stoffe genannt. Werden Kühlelemente nach diesem bekannten Verfahren hergestellt, so weist ein Teil der eingegossenen Rohre, die die Kühlflüssigkeit führen sollen, Undichtigkeiten auf.However, if cast steel is used as the casting material instead of gray cast iron, as described in DE-OS 29 o3 lo4 for a cooling element for a metallurgical furnace, This results in considerable casting and metallurgical problems for the casting of steel pipes. To eliminate these problems, it is proposed in the aforementioned DE-OS to arrange bodies made of steel or cast steel between the cooling tubes, which are intended to absorb the superheating heat of the liquid cast steel. Furthermore, the cooling tubes according to the prior art are to be filled with a high-melting granular material having a high thermal conductivity before the casting with liquid steel casting. Zirconium oxide and chromium oxide or a mixture of these substances is mentioned as the granular material. If cooling elements are produced according to this known method, some of the cast-in pipes that are to carry the cooling liquid 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, Si3N4 als Rohrfüllstoff verwendet wird. In bevorzugter Weise werden als körniges Material Mischungen aus gebranntem Magnesit mit bis zu je 3o% 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 bevorzugter Weise der gebrannte Magnesit ≥ 75% MgO, vorzugsweise ≥ 90% MgO, der Chromit ≥ 30% Cr2031 vorzugsweise ≥ 40% Cr203, der Korund und die Sintertonerde ≥ 90% Al2O3, vorzugsweise ≥ 95% Al2O3 enthalten und die auf natürliche oder synthetische Art gewonnenen Materialien sollen als Rest typische Verunreinigunge z.B. an Si02, Al2O3, CaO, MgO, Fe203/Fe0 in möglichst geringer Menge aufweisen.This object is achieved according to the invention in that the granular material used individually or as a mixture of magnesite (sintered magnesite), corundum, sintered alumina, chromite, SiC, Si 3 N 4 is used as the pipe filler. 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 tube filler. As the composition of the tube filler should preferably the calcined magnesite ≥ 75% MgO, preferably ≥ 90% MgO, the chromite ≥ 3 0% Cr 2 0 31, preferably ≥ 40% Cr 2 0 3, the corundum and the sintered alumina ≥ 90% Al 2 Contain O 3 , preferably ≥ 95% Al 2 O 3 and the materials obtained in a natural or synthetic way are said to be typical impurities as the remainder eg on Si0 2 , Al 2 O 3 , CaO, M g O, Fe 2 0 3 / Fe0 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 o bis 3 mm, vorzugsweise zwischen o bis 1 mm.Advantageously, the granular tube filler has the most dense spherical packing possible due to its grain size composition, i.e. 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 to 3 mm, preferably between 0 to 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 chemische Mittel mit ähnlicher Wirkung in entsprechender Dosierung zugesetzt.In order 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 that positively influence the flowability, such as them. also used in the coarse and fine ceramic industry. In a further embodiment of the invention, organic and / or inorganic dispersing, liquefying, plasticizing agents, binders and other chemical agents with a similar effect are therefore added to the tube filler in appropriate doses.
Die Vorteile des erfindungsgemäßen Verfahrens sind insbesondere darin zu sehen, daß nunmehr durchgehend dichte Kühlrohre in den Gußkörpern vorliegen, da der in die Stahlrohr 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 tube 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 the carburizing or decarburization of the steel tube material.
Die Zusammensetzung der bei dem Verfahren einzusetzenden Stahlgußschmelzen kann je nach Verwendungszweck in den unten angegebenen Grenzen variieren, da neben unlegiertem auch hochlegierter Stahlguß, z.B. für warmfeste und/oder zunderbeständige Gußteile zum Einsatz gelangen kann.
In gleicher Weise dient zur Lösung der vorgenannten Aufgabe bei einem Verfahren zur Herstellung von Gußkörpern mit eingegossenen Rohren aus Stahl, wobei die Gußkörper aus Stahlguß bestehen und die Stahlrohre mit einer überhitzten Stahlgußschmelze umgossen werden, daß die einzugießenden Stahlrohre mit auf der Rohroberfläche satt aufliegenden Rohrsegmenten oder Rohrschalen aus Stahl versehen werden, so daß zwischen Stahlrohroberfläche und Stahlrohrsegmenten oder -schalen nur ein minimaler Luftspalt verbleibt. In bevorzugter Weise bedecken die Stahlrohrsegmente oder Stahlrohrschalen nur 1/3 - 1/2 der Stahlrohroberfläche und werden nur auf der Gußoberseite aufgelegt. Zweckmäßiger Weise beträgt die Wandstärke der aufzulegenden Stahlrohrsegmente oder Stahlrohrschalen das 1/2 bis 3-fache derjenigen der einzugießenden Rohre. Die Werkstoffqualität der Stahlrohrsegmente oder Stahlrohrschalen spielt dabei eine untergeordnete Bedeutung. Schließlich 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 the same way, the above-mentioned object is achieved in a process for the production of castings with cast-in steel pipes, the castings being made of cast steel and the steel pipes being cast with an overheated cast steel melt, so that the steel pipes to be poured in are provided with pipe segments which lie snugly on the pipe surface or Pipe shells made of steel are provided so that only a minimal air gap remains between the steel pipe surface and steel pipe segments or shells. In a preferred manner, the steel pipe segments or steel pipe shells only cover 1/3 - 1/2 of the steel pipe surface and are only placed on the upper side of the casting. The wall thickness of the steel pipe segments or steel pipe shells to be placed is expediently 1/2 to 3 times that of the pipes to be cast in. The material quality of the steel pipe segments or steel pipe shells plays a minor role. Finally, ventilation holes in the steel pipe segments or shells and bevels on the edges ensure 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 on them.
Die Erfindung ist im folgenden anhand eines bevorzugten Ausführungsbeispieles 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 Al2O3, überzogen ist. Das Stahlrohr ist mit einem Sintermagnesit 4 der Körnung o - o,5 mm dicht verfüllt.In a casting mold, which is intended to cast the cast body 1 shown in Fig. 1, a
In derTabelle ist die chemische Zusammensetzung und Korngrößenverteilung des Sintermagnesites aufgeführt.The chemical composition and grain size distribution of the sintered magnetic site are listed in the table.
SiO2 0,8 %; Al2O3: 0,3% Fe203: 0,2 %; CaO: 2,3 %; MgO: 96 %SiO 2 0.8%; Al 2 O 3 : 0.3% F e 2 0 3 : 0.2%; CaO: 2.3%; MgO: 96%
o,5 - 0,25 mm 23 % o,25 - o,12 mm 27 % 0,12 - o mm 50 %o, 5 - 0.25 mm 23% o, 25 - o, 12 mm 27% 0.12 - o mm 50%
Der das Stahlrohr 2 umgebende Gußkörper 1 hat folgende chemische Zusammensetzung:
- Die Gießtemperatur beträgt ca. 1520 - 155°C.- The casting temperature is approx. 152 0 - 155 ° C.
Das einzugießende Stahlrohr entspricht dem Werkstoff St 35.8/II gemäß DIN 17 175.The steel pipe to be poured corresponds to material St 35.8 / II 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 einzugeießenden Stahlrohres, nämlich etwa 8 mm.Fig. 2 shows in detail the
Claims (11)
Priority Applications (1)
| 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. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3129391A DE3129391C1 (en) | 1981-07-25 | 1981-07-25 | Process for the production of castings with cast steel tubes |
| DE3129391 | 1981-07-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0071047A2 true EP0071047A2 (en) | 1983-02-09 |
| EP0071047A3 EP0071047A3 (en) | 1983-06-15 |
| EP0071047B1 EP0071047B1 (en) | 1985-05-29 |
Family
ID=6137727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82106016A Expired EP0071047B1 (en) | 1981-07-25 | 1982-07-06 | Process for making cast pieces with inserted steel tubes |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US4832106A (en) |
| EP (1) | EP0071047B1 (en) |
| 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) |
| ZA (1) | ZA824950B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2558084A1 (en) * | 1984-01-17 | 1985-07-19 | Renault | Bimetallic casting |
| EP0190114A1 (en) * | 1985-02-01 | 1986-08-06 | Ab Volvo | Molded metal object and method to manufacture the same |
| EP0443638A1 (en) * | 1990-02-20 | 1991-08-28 | SATURN CORPORATION (a Delaware corp.) | Transmission casing cover with tubular conduit cast in situ |
| WO1995015236A1 (en) * | 1993-12-02 | 1995-06-08 | Eisenwerk Brühl GmbH | Engine block with integral duct system and process for its manufacture |
| CN103008615A (en) * | 2012-12-06 | 2013-04-03 | 嘉应学院 | Manufacturing method of alloy steel cast-in zirconium corundum ceramic composite material |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3243377A1 (en) * | 1982-11-24 | 1984-08-23 | GMB Giesserei & Maschinenbau Bodan AG, Romanshorn | CASTING PIECE WITH MOLDED CHANNEL |
| US5111872A (en) * | 1990-02-20 | 1992-05-12 | Saturn Corporation | Transmission casing cover with tubular mechanically crimped conduit cast in situ |
| DE4102358C2 (en) * | 1991-01-26 | 2000-05-11 | Volkswagen Ag | Molded part to be produced in the die casting process, method for producing the molded part and hollow body for insertion into the molded part |
| DE4327242A1 (en) * | 1993-08-13 | 1995-02-16 | Luk Fahrzeug Hydraulik | Process for the production of die castings |
| US5635305A (en) * | 1995-05-22 | 1997-06-03 | Itt Automotive, Inc. | Machinable cast-in-place tube enclosure fittings |
| US5740851A (en) * | 1995-06-19 | 1998-04-21 | Trinova Corporation | Component with cast-in fluid passageways |
| DE19647069A1 (en) * | 1996-11-14 | 1998-05-20 | Heidelberger Druckmasch Ag | Hollow cast body e.g. printing machine cylinder preform |
| DE19751472A1 (en) * | 1996-12-03 | 1998-06-04 | Volkswagen Ag | Pressure diecasting method and equipment |
| CA2242057A1 (en) | 1998-06-30 | 1999-12-30 | Structures Monocoques Inc. | Modular stairway system, method for erecting stairway and kit therefor |
| JP3869255B2 (en) * | 2001-06-14 | 2007-01-17 | 富士通株式会社 | Metal molded body manufacturing method and metal molded body manufactured thereby |
| US20050133187A1 (en) * | 2003-12-17 | 2005-06-23 | Sean Seaver | Die casting method system and die cast product |
| US20050133102A1 (en) * | 2003-12-22 | 2005-06-23 | Blackman Donald E. | Hydraulic end head with internally cast hydraulic circuits |
| DE102005019961A1 (en) * | 2005-04-29 | 2006-11-02 | Audi Ag | Production of cast parts in compound gas used in automobile production, e.g. for production of cylinder crankcases, comprises removal core medium in second casting process into cooling vessel in pressure casting machine |
| NO328472B1 (en) * | 2007-06-06 | 2010-03-01 | Tool Tech As | Process for preparing various solid blanks with encapsulated rudder joints in powder stuffing |
| ES2331225B1 (en) * | 2008-04-25 | 2010-09-29 | Eads Construcciones Aeronauticas, S.A. | DOUBLE WALL CONDUCT SYSTEM. |
| US8327910B2 (en) * | 2010-12-15 | 2012-12-11 | GM Global Technology Operations LLC | Method of supporting tubing structures during overcasting |
| US9303595B2 (en) * | 2013-08-27 | 2016-04-05 | Deere & Company | Exhaust gas recirculation cooler mount |
| CN104308122B (en) * | 2014-10-29 | 2016-01-20 | 刘响 | A kind of filler punctured for high temperature-proof molten steel in casting process |
| CN108788095B (en) * | 2018-06-20 | 2020-04-28 | 四川共享铸造有限公司 | Casting method of steel pipe with cast-in oil duct |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1558292A1 (en) * | 1967-02-17 | 1970-03-19 | Siempelkamp Gmbh & Co | Method for producing a press plate from cast iron with cast-in steel tubes |
| DE2127448A1 (en) * | 1970-06-04 | 1971-12-09 | Ishikawajima Harima Heavy Ind | Device for cooling a wall section |
| DE2903104A1 (en) * | 1979-01-27 | 1980-07-31 | Hoesch Werke Ag | COOLING ELEMENT FOR A METALLURGICAL OVEN |
| DE3013560A1 (en) * | 1979-04-09 | 1980-10-23 | Nippon Kokan Kk | HIGH OVEN CORSET COOLING DEVICE |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5132426A (en) * | 1974-09-13 | 1976-03-19 | Kubota Ltd | REIKYAKUYOPAIPUNOIGURUMIKOZO |
| SU595067A1 (en) * | 1976-11-03 | 1978-02-28 | Институт Проблем Литья Ан Украинской Сср | Method of making reinforced castings |
| DE2719165C2 (en) * | 1977-04-29 | 1983-02-03 | Thyssen AG vorm. August Thyssen-Hütte, 4100 Duisburg | Cooling element for a metallurgical furnace |
| DE2804544C3 (en) * | 1978-02-03 | 1981-05-07 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 4200 Oberhausen | Cooling plate for a metallurgical furnace, in particular a blast furnace |
| JPS55139160A (en) * | 1979-04-16 | 1980-10-30 | Nikkei Giken:Kk | Internal chilling type casting method |
-
1981
- 1981-07-25 DE DE3129391A patent/DE3129391C1/en not_active Expired
-
1982
- 1982-04-28 MX MX192476A patent/MX159651A/en unknown
- 1982-05-19 ES ES512334A patent/ES512334A0/en active Granted
- 1982-06-22 BR BR8203636A patent/BR8203636A/en unknown
- 1982-07-02 AU AU85542/82A patent/AU554448B2/en not_active Ceased
- 1982-07-06 EP EP82106016A patent/EP0071047B1/en not_active Expired
- 1982-07-06 AT AT82106016T patent/ATE13497T1/en active
- 1982-07-06 DE DE8282106016T patent/DE3263883D1/en not_active Expired
- 1982-07-12 ZA ZA824950A patent/ZA824950B/en unknown
- 1982-07-21 DD DD82241838A patent/DD207344A1/en unknown
- 1982-07-21 JP JP57125951A patent/JPS5865565A/en active Granted
- 1982-07-21 PL PL1982237599A patent/PL139752B1/en unknown
- 1982-07-26 CA CA000408014A patent/CA1196767A/en not_active Expired
- 1982-07-27 US US06/402,300 patent/US4832106A/en not_active Expired - Fee Related
-
1983
- 1983-04-15 ES ES521488A patent/ES521488A0/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1558292A1 (en) * | 1967-02-17 | 1970-03-19 | Siempelkamp Gmbh & Co | Method for producing a press plate from cast iron with cast-in steel tubes |
| DE2127448A1 (en) * | 1970-06-04 | 1971-12-09 | Ishikawajima Harima Heavy Ind | Device for cooling a wall section |
| DE2903104A1 (en) * | 1979-01-27 | 1980-07-31 | Hoesch Werke Ag | COOLING ELEMENT FOR A METALLURGICAL OVEN |
| DE3013560A1 (en) * | 1979-04-09 | 1980-10-23 | Nippon Kokan Kk | HIGH OVEN CORSET COOLING DEVICE |
Non-Patent Citations (2)
| Title |
|---|
| DIDIER-WERKE AG, 1966, Wiesbaden (DE) * |
| DIDIER-WERKE AG, 1966, Wiesbaden (DE) "Feuerfest ABC" Seite 16, Stichwort "Chromit" * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2558084A1 (en) * | 1984-01-17 | 1985-07-19 | Renault | Bimetallic casting |
| EP0190114A1 (en) * | 1985-02-01 | 1986-08-06 | Ab Volvo | Molded metal object and method to manufacture the same |
| EP0443638A1 (en) * | 1990-02-20 | 1991-08-28 | SATURN CORPORATION (a Delaware corp.) | Transmission casing cover with tubular conduit cast in situ |
| WO1995015236A1 (en) * | 1993-12-02 | 1995-06-08 | Eisenwerk Brühl GmbH | Engine block with integral duct system and process for its manufacture |
| CN103008615A (en) * | 2012-12-06 | 2013-04-03 | 嘉应学院 | Manufacturing method of alloy steel cast-in zirconium corundum ceramic composite material |
Also Published As
| Publication number | Publication date |
|---|---|
| PL237599A1 (en) | 1983-05-23 |
| ES8307558A1 (en) | 1983-07-01 |
| PL139752B1 (en) | 1987-02-28 |
| JPS5865565A (en) | 1983-04-19 |
| EP0071047B1 (en) | 1985-05-29 |
| DE3129391C1 (en) | 1982-11-04 |
| AU554448B2 (en) | 1986-08-21 |
| ATE13497T1 (en) | 1985-06-15 |
| AU8554282A (en) | 1983-02-03 |
| JPS6245019B2 (en) | 1987-09-24 |
| BR8203636A (en) | 1983-06-14 |
| DD207344A1 (en) | 1984-02-29 |
| ZA824950B (en) | 1983-04-27 |
| MX159651A (en) | 1989-07-24 |
| DE3263883D1 (en) | 1985-07-04 |
| ES8402189A1 (en) | 1984-01-16 |
| US4832106A (en) | 1989-05-23 |
| CA1196767A (en) | 1985-11-19 |
| ES512334A0 (en) | 1983-07-01 |
| EP0071047A3 (en) | 1983-06-15 |
| ES521488A0 (en) | 1984-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0071047A2 (en) | Process for making cast pieces with inserted steel tubes | |
| DE3004712C2 (en) | Unfired refractory carbon brick | |
| DE2738926C2 (en) | Protection tube for a thermocouple | |
| DD155145A5 (en) | CASTED COMPOSITE PRODUCT FROM REFRACTORY MATERIAL AND METHOD FOR THE PRODUCTION THEREOF | |
| DE2520993B2 (en) | Refractory mass on the basis of silicic acid anhydride and its use for the production of the lining of a pouring funnel and a method for treating such a lining | |
| DE3119548C1 (en) | Wear layer of a metallurgical vessel lined with permanent lining with a layer not sintered towards the permanent lining | |
| DE3614730C2 (en) | ||
| DE2949998A1 (en) | METHOD FOR PRODUCING A MODULE UNIT FOR THE WALL OF A METALLURGICAL FURNACE | |
| DE1267382B (en) | Process for the prevention of edge decarburization in precision castings and backfill compounds for the process | |
| DE2318817A1 (en) | DEVICE FOR CASTING MOLTEN METAL AND WORKING PROCEDURE FOR OPERATING THE DEVICE | |
| DE2716092A1 (en) | Tundish for the casting of steel - with consumable inner lining made of panels contg. sand, silica flour, and binders | |
| DE2205694A1 (en) | Process for the heat treatment of metallic flat material and support roller therefor | |
| DE3512379C2 (en) | Refractory material containing carbon and process for its manufacture | |
| DE2165740C3 (en) | Melt-cast refractory product based on MgO | |
| DE2118194A1 (en) | Dry, fireproof unit | |
| DE682062C (en) | Fireproof structures with a metallic coating | |
| DE660771C (en) | Lining for aluminum furnaces | |
| AT319494B (en) | Breaker core for sand mold casting, especially for iron and steel casting, and process for its manufacture | |
| AT344061B (en) | DIMENSIONS FOR THE PRODUCTION OF HIGHLY FIRE-RESISTANT PRODUCTS | |
| DE1912410A1 (en) | Process for protecting the lining of a ladle furnace and protective body for carrying out the process | |
| AT384208B (en) | Process for producing a hydraulic refractory cement composition | |
| DE1508571C (en) | Refractory lining for induction furnaces | |
| DE1192792B (en) | Resin mold or shell to hold green casting cores | |
| AT215608B (en) | Mold lining | |
| AT220534B (en) | Refractory product melted and poured into molds |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT LU NL SE |
|
| ITCL | It: translation for ep claims filed |
Representative=s name: BARZANO' E ZANARDO ROMA S.P.A. |
|
| EL | Fr: translation of claims filed | ||
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| TCNL | Nl: translation of patent claims filed | ||
| AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT LU NL SE |
|
| 17P | Request for examination filed |
Effective date: 19830915 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HOESCH AKTIENGESELLSCHAFT |
|
| ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO ROMA S.P.A. |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT LU NL SE |
|
| REF | Corresponds to: |
Ref document number: 13497 Country of ref document: AT Date of ref document: 19850615 Kind code of ref document: T |
|
| REF | Corresponds to: |
Ref document number: 3263883 Country of ref document: DE Date of ref document: 19850704 |
|
| ET | Fr: translation filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19850731 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19890607 Year of fee payment: 8 Ref country code: AT Payment date: 19890607 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19890612 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19890617 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19890623 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19890630 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19890707 Year of fee payment: 8 |
|
| ITTA | It: last paid annual fee | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19890731 Year of fee payment: 8 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19900706 Ref country code: AT Effective date: 19900706 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19900707 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19900731 |
|
| BERE | Be: lapsed |
Owner name: HOESCH A.G. Effective date: 19900731 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19910201 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19910329 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19910403 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| EUG | Se: european patent has lapsed |
Ref document number: 82106016.7 Effective date: 19910402 |