EP0141966A1 - Procédé de coulée par centrifugation - Google Patents

Procédé de coulée par centrifugation Download PDF

Info

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
Authority
EP
European Patent Office
Prior art keywords
additive
cast iron
alloy
nickel
centrifugal casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84110897A
Other languages
German (de)
English (en)
Other versions
EP0141966B1 (fr
Inventor
Kurt Grütter
Bernhard Bergmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Von Roll AG
Original Assignee
Von Roll AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Von Roll AG filed Critical Von Roll AG
Priority to AT84110897T priority Critical patent/ATE33352T1/de
Publication of EP0141966A1 publication Critical patent/EP0141966A1/fr
Application granted granted Critical
Publication of EP0141966B1 publication Critical patent/EP0141966B1/fr
Expired legal-status Critical Current

Links

Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Continuous Casting (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Powder Metallurgy (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP84110897A 1983-09-19 1984-09-12 Procédé de coulée par centrifugation Expired EP0141966B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110897T ATE33352T1 (de) 1983-09-19 1984-09-12 Verfahren zum schleudergiessen von rohren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5082/83 1983-09-19
CH5082/83A CH660856A5 (de) 1983-09-19 1983-09-19 Verfahren zum schleudergiessen von rohren.

Publications (2)

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

Family

ID=4287638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110897A Expired EP0141966B1 (fr) 1983-09-19 1984-09-12 Procédé de coulée par centrifugation

Country Status (6)

Country Link
EP (1) EP0141966B1 (fr)
JP (1) JPS6087965A (fr)
AT (1) ATE33352T1 (fr)
CA (1) CA1232428A (fr)
CH (1) CH660856A5 (fr)
DE (1) DE3470288D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045879A1 (fr) * 1999-12-20 2001-06-28 Dochernee Predpriyatie Nexus Proizvodstvenno-Kommercheskaya Kompaniya Procede de moulage par centrifugation d'ebauches de cylindres utilises dans des machines de moulage en continu d'ebauches
DE102015111096A1 (de) * 2015-07-09 2017-01-12 Benteler Steel/Tube Gmbh Verfahren zur Herstellung eines nahtlosen, mehrlagigen Rohrproduktes und Rund- oder Mehrkantblock zur Verwendung bei diesem Verfahren
DE102020200034A1 (de) * 2020-01-03 2021-07-08 Sms Group Gmbh Verfahren zur Herstellung eines Verbundrohres sowie Verbundrohr

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102274951B (zh) * 2011-08-04 2013-03-06 广东新劲刚超硬材料有限公司 一种铸件表面原位合成碳化钛基硬质合金涂层的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139880A1 (de) * 1971-08-09 1973-02-22 Apv Paramount Ltd Bi-metall-rohr mit korrosionsbestaendiger aeusserer oberflaeche
DE2254705A1 (de) * 1972-11-09 1974-05-22 Deutsche Edelstahlwerke Gmbh Schleudergussverfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852630A (fr) * 1971-11-05 1973-07-24
JPS4918696A (fr) * 1972-06-15 1974-02-19
IN154618B (fr) * 1980-12-22 1984-11-17 Abex Corp
JPS59220266A (ja) * 1983-05-27 1984-12-11 Kawasaki Heavy Ind Ltd 遠心鋳造による複合鋼管の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139880A1 (de) * 1971-08-09 1973-02-22 Apv Paramount Ltd Bi-metall-rohr mit korrosionsbestaendiger aeusserer oberflaeche
DE2254705A1 (de) * 1972-11-09 1974-05-22 Deutsche Edelstahlwerke Gmbh Schleudergussverfahren

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045879A1 (fr) * 1999-12-20 2001-06-28 Dochernee Predpriyatie Nexus Proizvodstvenno-Kommercheskaya Kompaniya Procede de moulage par centrifugation d'ebauches de cylindres utilises dans des machines de moulage en continu d'ebauches
DE102015111096A1 (de) * 2015-07-09 2017-01-12 Benteler Steel/Tube Gmbh Verfahren zur Herstellung eines nahtlosen, mehrlagigen Rohrproduktes und Rund- oder Mehrkantblock zur Verwendung bei diesem Verfahren
DE102015111096B4 (de) 2015-07-09 2018-04-26 Benteler Steel/Tube Gmbh Verfahren zur Herstellung eines nahtlosen, mehrlagigen Rohrproduktes
DE102020200034A1 (de) * 2020-01-03 2021-07-08 Sms Group Gmbh Verfahren zur Herstellung eines Verbundrohres sowie Verbundrohr

Also Published As

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

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