EP0141966A1 - Process for centrifugal casting - Google Patents

Process for centrifugal casting Download PDF

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Publication number
EP0141966A1
EP0141966A1 EP84110897A EP84110897A EP0141966A1 EP 0141966 A1 EP0141966 A1 EP 0141966A1 EP 84110897 A EP84110897 A EP 84110897A EP 84110897 A EP84110897 A EP 84110897A EP 0141966 A1 EP0141966 A1 EP 0141966A1
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EP
European Patent Office
Prior art keywords
additive
cast iron
alloy
nickel
centrifugal casting
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Granted
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EP84110897A
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German (de)
French (fr)
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EP0141966B1 (en
Inventor
Kurt Grütter
Bernhard Bergmann
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Von Roll AG
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Von Roll AG
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Priority to AT84110897T priority Critical patent/ATE33352T1/en
Publication of EP0141966A1 publication Critical patent/EP0141966A1/en
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Publication of EP0141966B1 publication Critical patent/EP0141966B1/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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • 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
    • B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack

Definitions

  • the invention relates to a method for centrifugally casting pipes, in which a liquid cast iron is introduced into a rotating metallic mold, additives being introduced before or during the introduction of the melt.
  • the application possibilities for the tubes manufactured by the centrifugal casting process are numerous. A particularly important and extensive area of application is the use of these pipes when transporting liquids of all kinds.
  • the lines created for this are often laid in the ground, where they come into direct contact with the surrounding ground material. This contact makes it possible that a chemical or electrochemical reaction of the pipe material with its surroundings can occur, which can lead to the destruction of the pipe material.
  • the known measures mean an additional treatment of the finished pipe, for which appropriate facilities are required.
  • the tarring of the pipes should be mentioned, for which the pipes are immersed in a tar bath.
  • Other known measures include wrapping the tube with a loose plastic film, spray galvanizing or extruding a polyethylene coating. It is also known to apply an additional coating reinforced with glass fibers.
  • the additive forms a corrosion-resistant layer which alloys with the tube on the outer surface of the tube to be spun.
  • additives when pouring the molten metal into the rotating mold, which are introduced either before or during the introduction into the mold.
  • additives include e.g. Flux material (DE-OS 3 105 145), which is used to form a sealing slag on the inner surface of the tube, which absorb any impurities trapped in the molten metal.
  • Additives can also be introduced to influence the cooling of the molten metal in the coke, e.g. to slow down in order to improve the structure and thus the pipe quality (DE-AS 2 460 510).
  • the inner layer can be a plating layer containing nickel as the alloying element.
  • the invention is based on the consideration that the solution to the above-mentioned object is only achieved if the formation of an additional protective layer on the outer surface of the tube is dispensed with and the protective layer as Part of the metal wall of the tube is formed with a corresponding change in the structure.
  • a nickel alloy which has a nickel content of 80% and more nickel has proven to be particularly suitable.
  • the other alloying elements can be boron, silicon, chromium and copper. Such alloys are known as corrosion and heat resistant materials and are commercially available. This alloy is introduced into the centrifugal casting mold in powder form with a grain size of approximately 0.1-1 mm.
  • the specific weight of such alloys is significantly higher than the specific weight of the cast iron melt and is approximately 7.8 g / cm 3 .
  • the melting point of such nickel alloys is said to be lower than 1300 ° C and is thus lower than the casting temperature of the cast iron melt of approximately 1350 - 1380 ° C. Particularly favorable conditions are achieved when the melting point of the nickel alloy is below the liquidus temperature of the liquid cast iron, i.e. below approx. 1150 ° C.
  • This material was introduced in powder form through the trough at the same time as the liquid cast iron.
  • the metal powder has a melting point of 1120 ° C. and a specific weight of 7.8 g / cm 3 .
  • the metal powder with the liquid cast iron introduced to form an alloy with the outer wall zone of the tube In order for the metal powder with the liquid cast iron introduced to form an alloy with the outer wall zone of the tube to be spun, it had to be introduced in such an amount that an alloyed outer wall zone of 0.1-1.0 mm, preferably 0.4 mm, made of austenitic Ductile iron (21 - 24% Ni) was formed.
  • the liquid iron was introduced into the mold in a second operation. An alloyed outer skin of the tube made of austenitic nodular iron was created again.
  • the method described is by no means limited to the centrifugal casting of tubes made of lamellar or spheroidal graphite, but can also be used in an analogous manner for other metal melts.
  • the metal powders to be used have a correspondingly lower melting point and a higher specific weight than the melt.

Abstract

1. Process for centrifugal casting of tubes in which liquid cast iron is introduced into a rotating metallic mould, wherein an additive material in powder form is also introduced into this, characterized in that there is introduced, as additive material, a nickel alloy in powder form on to the inner surface of the rotating mould before the introduction of the liquid cast iron, in order that an alloyed peripheral layer is formed at the outer surface of the tube.

Description

Die Erfindung betrifft ein Verfahren zum Schleudergiessen von Rohren, bei welchen ein flüssiges Gusseisen in eine rotierende metallische Kokille eingebracht wird, wobei vor oder während des Einbringens der Schmelze Zusatzmittel eingebracht werden.The invention relates to a method for centrifugally casting pipes, in which a liquid cast iron is introduced into a rotating metallic mold, additives being introduced before or during the introduction of the melt.

Die Herstellung von Rohren nach dem Schleudergiessverfahren ist schon seit langer Zeit bekannt. Bei diesem Verfahren wird eine vorbestimmte Menge einer Metallschmelze über einen Giesskanal in eine rotierende, die Giessform bildende Kokille eingegossen, wobei der Giessvorgang innerhalb einer vorbestimmten Zeit zu erfolgen hat, damit die gewünschten Eigenschaften des Materials erreicht werden. In grossem Umfang ist es bekannt, für das Schleudergiessen von Rohren eine Gusseisenschmelze zu vergiessen, wobei es sich hierbei sowohl um ein Gusseisen mit Lamellengraphit als auch um ein Gusseisen mit Kugelgraphit handeln kann.The manufacture of pipes by centrifugal casting has been known for a long time. In this method, a predetermined amount of a molten metal is poured via a pouring channel into a rotating mold that forms the casting mold, the casting process having to take place within a predetermined time so that the desired properties of the material are achieved. To a large extent, it is known to cast a cast iron melt for the centrifugal casting of pipes, which can be both a cast iron with lamellar graphite and a cast iron with spheroidal graphite.

Die Anwendungsmöglichkeiten für die nach dem Schleudergiessverfahren hergestellten Rohre sind überaus zahlreich. Ein besonders wichtiges und umfangreiches Anwendungsgebiet ist die Verwendung dieser Rohre beim Transport von Flüssigkeiten aller Art. Die hierfür erstellten Leitungen sind oft im Boden verlegt, wobei sie unmittelbar mit dem umliegenden Bodenmaterial in Berührung kommen. Durch diesen Kontakt besteht die Möglichkeit, dass eine chemische oder elektrochemische Reaktion des Rohrmaterials mit seiner Umgebung auftreten kann, die zur Zerstörung des Rohrmaterials führen kann.The application possibilities for the tubes manufactured by the centrifugal casting process are numerous. A particularly important and extensive area of application is the use of these pipes when transporting liquids of all kinds. The lines created for this are often laid in the ground, where they come into direct contact with the surrounding ground material. This contact makes it possible that a chemical or electrochemical reaction of the pipe material with its surroundings can occur, which can lead to the destruction of the pipe material.

Dem Auftreten von chemischen und/oder elektrochemischen Reaktionen an diesen im Erdboden verlegten Rohren kann mit verschiedenen Massnahmen begegnet werden. Die bekannten Massnahmen bedeuten jedoch eine zusätzlich Behandlung des fertigen Rohrs, wofür entsprechende Einrichtungen erforderlich sind. Von den bekannten Massnahmen sei das Teeren der Rohre erwähnt, wozu die Rohre in ein Teerbad eingetaucht werden. Andere bekannte Massnahmen stellen das Einwickeln des Rohrs mit einer losen Kunststoffolie, die Spritzverzinkung oder das Aufextrudieren einer Polyäthylen-Beschichtung dar. Auch ist das Aufbringen einer mit Glasfasern verstärkten Zusatzbeschichtung bekannt. Trotz des verhältnismässig grossen Aufwandes für das Anbringen solcher Schutzschichten kann ein zuverlässiger Schutz nicht gewährleistet werden, da diese Schutzschichten beschädigt werden können, insbesondere bei der Lagerung, beim Transport und beim Verlegen. Aber selbst dann, wenn bis zum Verlegen der Rohre keine Verletzung der Schutzschicht auftritt, ist eine solche auch nachher noch möglich, z.B. beim Auffüllen der Gräben infolge von Belastungen, die durch den Verkehr entstehen, und infolge von Erdbewegungen wie Senkungen o.dgl.The occurrence of chemical and / or electrochemical reactions on these pipes laid in the ground can be countered with various measures. However, the known measures mean an additional treatment of the finished pipe, for which appropriate facilities are required. Of the known measures, the tarring of the pipes should be mentioned, for which the pipes are immersed in a tar bath. Other known measures include wrapping the tube with a loose plastic film, spray galvanizing or extruding a polyethylene coating. It is also known to apply an additional coating reinforced with glass fibers. In spite of the relatively large outlay for the application of such protective layers, reliable protection cannot be guaranteed, since these protective layers can be damaged, in particular during storage, during transport and when laying. But even if there is no damage to the protective layer before the pipes are laid, this is still possible afterwards, e.g. when filling the trenches as a result of loads caused by traffic and as a result of earth movements such as subsidence or the like.

Weisen die erwähnten Schutzschichten verletzte Stellen auf, zeigt es sich, dass diese besonders gefährdet sind; die auftretende Korrosion konzentriert sich auf diese Stellen und schreitet deshalb besonders rasch voran. Hierbei beginnt die Korrosion an der Aussenumfangsfläche des Rohres und schreitet von aussen nach innen fort.If the protective layers mentioned have injured areas, it shows that they are particularly at risk; The corrosion that occurs is concentrated in these areas and therefore progresses particularly quickly. Here be corrosion begins on the outer circumferential surface of the pipe and progresses from the outside inwards.

Hier setzt die Erfindung ein, der die Aufgabe zugrundeliegt, ein Verfahren der eingangs beschriebenen Art so auszugestalten, dass unter Einhaltung eines gleichartigen Schutzes gegen chemische und/oder elektrochemische Reaktionen des Rohrmaterials mit seiner Umgebung eine Beschädigung dieses Schutzes zuverlässig vermieden wird.This is where the invention comes in, which is based on the object of designing a method of the type described in the introduction in such a way that damage to this protection is reliably avoided while maintaining a similar protection against chemical and / or electrochemical reactions of the pipe material with its surroundings.

Diese Aufgabe wird gemäss der Erfindung dadurch gelöst, dass durch das Zusatzmittel auf der Aussenfläche des zu schleudernden Rohres eine korrosionsfeste, mit dem Rohr eine Legierung eingehende Schicht gebildet wird.This object is achieved according to the invention in that the additive forms a corrosion-resistant layer which alloys with the tube on the outer surface of the tube to be spun.

Zwar ist es bekannt, beim Schleudergiessen von Rohren beim Eingiessen der Metallschmelze in die rotierende Kokille Zusatzmittel zu verwendet, die entweder vor dem oder während des Einbringens in die Kokille eingebracht werden. Unter diese Zusatzmittel fällt z.B. Flussmaterial (DE-OS 3 105 145), das dazu verwendet wird, um eine dichtende Schlacke an der Innenfläche des Rohres auszubilden, welche etwaige in der Metallschmelze eingeschlossene Verunreinigungen aufnehmen.In centrifugal casting of pipes, it is known to use additives when pouring the molten metal into the rotating mold, which are introduced either before or during the introduction into the mold. These additives include e.g. Flux material (DE-OS 3 105 145), which is used to form a sealing slag on the inner surface of the tube, which absorb any impurities trapped in the molten metal.

Zusatzmittel können auch eingebracht werden, um die Abkühlung der Metallschmelze in der Kokile zu beeinflussen, z.B. zu verlangsamen, um dadurch das Gefüge und damit die Rohrqualität zu verbessern (DE-AS 2 460 510).Additives can also be introduced to influence the cooling of the molten metal in the coke, e.g. to slow down in order to improve the structure and thus the pipe quality (DE-AS 2 460 510).

Beim Schleudergiessen von Bimetallrohren ist es bekannt (DE-OS 2 852 030) nacheinander verschiedene Schmelzen zur Bildung unterschiedlicher Schichten in die rotierende Kokille einzubringen. Hierbei wird die nächste Schicht erst eingebracht, wenn.die Grundschicht eine unter der Solidustemperatur liegende Temperatur erreicht hat. Die innere Schicht kann hierbei eine, Nickel als Liegierungselement enthaltende Plattierungsschicht sein.In centrifugal casting of bimetallic tubes, it is known (DE-OS 2 852 030) to use different melts in succession Formation of different layers in the rotating mold. The next layer is only applied when the base layer has reached a temperature below the solidus temperature. The inner layer can be a plating layer containing nickel as the alloying element.

Im Gegensatz zu den bekannten Anwendungen von Zusatzmitteln beim Schleudergiessen von Rohren geht die Erfindung von der Ueberlegung aus, dass die Lösung der vorstehend genannten Aufgabe nur dann erreicht wird, wenn auf die Bildung einer zusätzlichen Schutzschicht an der Aussenfläche des Rohrs verzichtet und dafür die Schutzschicht als Teil der Metallwandung des Rohrs unter entsprechender Veränderung des Gefüges gebildet wird.In contrast to the known applications of additives in centrifugal casting of pipes, the invention is based on the consideration that the solution to the above-mentioned object is only achieved if the formation of an additional protective layer on the outer surface of the tube is dispensed with and the protective layer as Part of the metal wall of the tube is formed with a corresponding change in the structure.

Es hat sich nun überraschend gezeigt, dass die Bildung einer solchen Schutzschicht in verhältnismässig einfacher Weise beim Einbringen der Metallschmelze erreicht werden kann, wenn ein hierzu geeignetes Zusatzmittel vor oder während des Einbringens der Schmelze in die Kokille eingebracht wird. Als besonders geeignet hat sich eine Nickellegierung erwiesen, die einen Nickelgehalt von 80% und mehr Nickel enthält. Die weiteren Legierungselemente können Bor, Silizium, Chrom und Kupfer sein. Solche Legierungen sind als korrosions- und hitzebeständige Materialien bekannt und im Handel erhältlich. Diese Legierung wird in Pulverform mit einer Korngrösse von etwa 0,1-1 mm in die Schleudergiesskokille eingebracht.It has now surprisingly been found that the formation of such a protective layer can be achieved in a relatively simple manner when introducing the molten metal if a suitable additive is introduced into the mold before or during the introduction of the melt. A nickel alloy which has a nickel content of 80% and more nickel has proven to be particularly suitable. The other alloying elements can be boron, silicon, chromium and copper. Such alloys are known as corrosion and heat resistant materials and are commercially available. This alloy is introduced into the centrifugal casting mold in powder form with a grain size of approximately 0.1-1 mm.

Das spezifische Gewicht solcher Legierungen liegt deutlich über dem spezifischen Gewicht der Gusseisenschmelze und beträgt etwa 7,8 g/cm 3.The specific weight of such alloys is significantly higher than the specific weight of the cast iron melt and is approximately 7.8 g / cm 3 .

Der Schmelzpunkt solcher Nickellegierungen soll tiefer sein als 1300°C und liegt damit tiefer als die Giesstemperatur der Gusseisenschmelze von etwa 1350 - 1380°C. Besonders günstige Verhältnisse werden erreicht, wenn der Schmelzpunkt der Nickellegierung unterhalb der Liquidustemperatur des flüssigen Gusseisens, d.h. unterhalb ca. 1150°C, liegt.The melting point of such nickel alloys is said to be lower than 1300 ° C and is thus lower than the casting temperature of the cast iron melt of approximately 1350 - 1380 ° C. Particularly favorable conditions are achieved when the melting point of the nickel alloy is below the liquidus temperature of the liquid cast iron, i.e. below approx. 1150 ° C.

Nachstehend werden Ausführungsbeispiele für im Schleuderguss hergestellte Rohre aus Gusseisen mit Kugelgraphit angeführt, die nach dem beschriebenen Verfahren hergestellt wurden:Below are examples of centrifugally cast iron pipes made of spheroidal graphite, which were produced by the described method:

Beispiel 1example 1

In die Stahlkokille einer Schleudergiessmaschine wurde ein Metallpulver mit dem Handelsnamen Hastelloy D eingebracht, dessen chemische Analyse 85% Ni

  • 10% Si
  • 3% Cu
    ist.
A metal powder with the trade name Hastelloy D was introduced into the steel mold of a centrifugal casting machine, the chemical analysis of which was 85% Ni
  • 10% Si
  • 3% Cu
    is.

Dieses Material wurde in Pulverform über die Giessrinne gleichzeitig mit dem flüssigen Gusseisen eingebracht. Das Metallpulver hat einen Schmelzpunkt von 1120°C und ein spezifisches Gewicht von 7,8 g/cm3.This material was introduced in powder form through the trough at the same time as the liquid cast iron. The metal powder has a melting point of 1120 ° C. and a specific weight of 7.8 g / cm 3 .

Damit das Metallpulver mit dem eingebrachten flüssigen Gusseisen seinerseits mit der Aussenwandzone des zu schleudernden Rohres eine Legierung eingeht, musste es in einer solchen Menge eingebracht werden, dass eine legierte Aussenwandzone von O,1 - 1,0 mm, vorzugsweise 0,4 mm aus austenitischem Sphärogusseisen (21 - 24% Ni) entstand.In order for the metal powder with the liquid cast iron introduced to form an alloy with the outer wall zone of the tube to be spun, it had to be introduced in such an amount that an alloyed outer wall zone of 0.1-1.0 mm, preferably 0.4 mm, made of austenitic Ductile iron (21 - 24% Ni) was formed.

Beispiel 2Example 2

In die in Rotation begriffene Stahlkokille einer Schleudergiessmaschine wurde ein Metallpulver der chemischen Zusammensetzung 94% Ni 3% B 3% Si eingebracht, das einen Schmelzpunkt von 1050°C aufweist. Das Einbringen erfolgt gleichmässig, beispielsweise mit einer Siebeinrichtung, über die gesamte Innenfläche der Kokille. Die Menge des Metallpulvers wurde in gleicher Weise dosiert wie in Beispiel 1.A metal powder with the chemical composition 94% Ni 3% B 3% Si, which has a melting point of 1050 ° C., was introduced into the rotating steel mold of a centrifugal casting machine. The introduction takes place uniformly, for example with a screening device, over the entire inner surface of the mold. The amount of the metal powder was metered in the same way as in Example 1.

Nach dem Einbringen des Metallpulvers wurde in einem zweiten Arbeitsgang das flüssige Eisen in die Kokille eingebracht. Es entstand wieder eine legierte Aussenhaut des Rohres aus austenitischem Sphärogusseisen.After the metal powder had been introduced, the liquid iron was introduced into the mold in a second operation. An alloyed outer skin of the tube made of austenitic nodular iron was created again.

Das beschriebene Verfahren ist keineswegs auf das Schleudergiessen von Rohren aus Lamellen- oder Kugelgraphit beschränkt, sondern kann in analoger Weise auch für andere Metallschmelzen verwendet werden. Die zu verwendenden Metallpulver haben hierbei entsprechend einen tieferen Schmelzpunkt und ein höheres spezifisches Gewicht als die Schmelze aufzuweisen.The method described is by no means limited to the centrifugal casting of tubes made of lamellar or spheroidal graphite, but can also be used in an analogous manner for other metal melts. The metal powders to be used have a correspondingly lower melting point and a higher specific weight than the melt.

Claims (6)

1. Verfahren zum Schleudergiessen von Rohren, bei welchen ein flüssiges Gusseisen in eine rotierende metallische Kokille eingebracht wird, wobei vor oder während des Einbringens der Schmelze Zusatzmittel eingebracht werden, dadurch gekennzeichnet, dass durch das Zusatzmittel auf der Aussenfläche des zu schleudernden Rohres eine korrosionsfeste, mit dem Rohr eine Legierung eingehende Schicht gebildet wird.1. A method for centrifugally casting pipes, in which a liquid cast iron is introduced into a rotating metallic mold, additives being introduced before or during the introduction of the melt, characterized in that the additive on the outer surface of the pipe to be spun has a corrosion-resistant, an alloy incoming layer is formed with the tube. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Zusatzmittel eine Nickel-Legierung mit 80 % oder mehr Nickel eingebracht wird, wobei sowohl Nickel als Hauptlegierungselement und die andern Legierungselemente in Pulverform eingebracht werden.2. The method according to claim 1, characterized in that a nickel alloy with 80% or more nickel is introduced as an additive, both nickel as the main alloy element and the other alloy elements being introduced in powder form. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die andern Legierungselemente Elemente der Gruppe Bor, Silizium, Chrom und Kupfer sind.3. The method according to claim 2, characterized in that the other alloy elements are elements from the group boron, silicon, chromium and copper. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass als das Zusatzmittel ein solches mit einem grösseren spezifischen Gewicht als das spezifische Gewicht der Schmelze eingebracht wird.4. The method according to claim 3, characterized in that the additive is introduced with a greater specific weight than the specific weight of the melt. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass der Schmelzpunkt des bzw. der Zusatzmittel tiefer gewählt wird als 1300°C.5. The method according to claim 4, characterized in that the melting point of the additive or additives is chosen lower than 1300 ° C. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass als Schmelzpunkt des bzw. der Zusatzmittel eine Temperatur gewählt wird, die unterhalb der Liquidustemperatur des flüssigen Gusseisens von ca. 1150°C liegt.6. The method according to claim 5, characterized in that a temperature is selected as the melting point of the additive (s) which is below the liquidus temperature of the liquid cast iron of approximately 1150 ° C.
EP84110897A 1983-09-19 1984-09-12 Process for centrifugal casting Expired EP0141966B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110897T ATE33352T1 (en) 1983-09-19 1984-09-12 PROCESS FOR CENTRAL CASTING OF PIPES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5082/83A CH660856A5 (en) 1983-09-19 1983-09-19 METHOD FOR SPIN CASTING PIPES.
CH5082/83 1983-09-19

Publications (2)

Publication Number Publication Date
EP0141966A1 true EP0141966A1 (en) 1985-05-22
EP0141966B1 EP0141966B1 (en) 1988-04-06

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EP (1) EP0141966B1 (en)
JP (1) JPS6087965A (en)
AT (1) ATE33352T1 (en)
CA (1) CA1232428A (en)
CH (1) CH660856A5 (en)
DE (1) DE3470288D1 (en)

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WO2001045879A1 (en) * 1999-12-20 2001-06-28 Dochernee Predpriyatie Nexus Proizvodstvenno-Kommercheskaya Kompaniya Method for centrifugal casting of blanks for rollers used in machines for continuous casting of blanks
DE102015111096A1 (en) * 2015-07-09 2017-01-12 Benteler Steel/Tube Gmbh Process for the preparation of a seamless, multi-layered tube product and round or polygonal block for use in this process
DE102020200034A1 (en) * 2020-01-03 2021-07-08 Sms Group Gmbh Process for producing a composite pipe and composite pipe

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CN102274951B (en) * 2011-08-04 2013-03-06 广东新劲刚超硬材料有限公司 Method for synthesizing titanium carbide-base hard alloy coating on surfaces of castings in situ

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DE2254705A1 (en) * 1972-11-09 1974-05-22 Deutsche Edelstahlwerke Gmbh Centrifugally cast tubes, esp. for abrasive processes - mfd. by sprink-ling heavy modifying powder onto surface of still soft smelt

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JPS59220266A (en) * 1983-05-27 1984-12-11 Kawasaki Heavy Ind Ltd Production of composite steel pipe by centrifugal casting

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Publication number Priority date Publication date Assignee Title
DE2139880A1 (en) * 1971-08-09 1973-02-22 Apv Paramount Ltd Bi metallic tubes - with specified properties of inner or outer layers
DE2254705A1 (en) * 1972-11-09 1974-05-22 Deutsche Edelstahlwerke Gmbh Centrifugally cast tubes, esp. for abrasive processes - mfd. by sprink-ling heavy modifying powder onto surface of still soft smelt

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045879A1 (en) * 1999-12-20 2001-06-28 Dochernee Predpriyatie Nexus Proizvodstvenno-Kommercheskaya Kompaniya Method for centrifugal casting of blanks for rollers used in machines for continuous casting of blanks
DE102015111096A1 (en) * 2015-07-09 2017-01-12 Benteler Steel/Tube Gmbh Process for the preparation of a seamless, multi-layered tube product and round or polygonal block for use in this process
DE102015111096B4 (en) 2015-07-09 2018-04-26 Benteler Steel/Tube Gmbh Process for producing a seamless, multi-layer pipe product
DE102020200034A1 (en) * 2020-01-03 2021-07-08 Sms Group Gmbh Process for producing a composite pipe and composite pipe

Also Published As

Publication number Publication date
EP0141966B1 (en) 1988-04-06
ATE33352T1 (en) 1988-04-15
JPH0520184B2 (en) 1993-03-18
CA1232428A (en) 1988-02-09
CH660856A5 (en) 1987-05-29
JPS6087965A (en) 1985-05-17
DE3470288D1 (en) 1988-05-11

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