EP0032282B1 - Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen - Google Patents

Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen Download PDF

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Publication number
EP0032282B1
EP0032282B1 EP80300136A EP80300136A EP0032282B1 EP 0032282 B1 EP0032282 B1 EP 0032282B1 EP 80300136 A EP80300136 A EP 80300136A EP 80300136 A EP80300136 A EP 80300136A EP 0032282 B1 EP0032282 B1 EP 0032282B1
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EP
European Patent Office
Prior art keywords
cast iron
graphite
agent
iron
magnesium
Prior art date
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Expired
Application number
EP80300136A
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English (en)
French (fr)
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EP0032282A1 (de
Inventor
Clifford Matthew Dunks
Geoffrey Mannion
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.)
Materials and Methods Ltd
Original Assignee
Materials and Methods Ltd
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Publication date
Application filed by Materials and Methods Ltd filed Critical Materials and Methods Ltd
Priority to DE8080300136T priority Critical patent/DE3070892D1/de
Priority to AT80300136T priority patent/ATE14455T1/de
Priority to EP80300136A priority patent/EP0032282B1/de
Publication of EP0032282A1 publication Critical patent/EP0032282A1/de
Application granted granted Critical
Publication of EP0032282B1 publication Critical patent/EP0032282B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • This invention relates to a process for the manufacture of cast iron with vermicular graphite.
  • Vermicular graphite is a name given to flake graphite which has become rounded, thickened and shortened compared with the normal elongated flakes commonly found in grey cast irons.
  • This modified form of graphite is known by several other names including “compacted”, “quasi-flake”, “aggregate flake”, “chunky”, “stubby”, “up-graded”, “semi-nodular”, “P-type” and "floccular” graphite.
  • GB-PS-1,427,445 there is described a method of treating molten carbon-containing iron to produce cast iron with a compacted graphite structure comprising adding to the molten iron in a single step a quantity of an alloy containing silicon, magnesium, titanium and a rare earth, the balance being iron.
  • the titanium acts as a nodularization inhibitor.
  • the art therefore teaches the necessity of using a nodularization inhibitor when producing compacted vermicular graphite.
  • Iron inherently contains titanium to a certain extent that is up to about 0.015%. The presence of titanium above this level is known to be undesirable.
  • an alloy which does not contain titanium is used. This is made possible because the system described in UK-PS-1,278,265, with which a great detail of control can be achieved, makes possible the production of cast iron with vermicular graphite without having to use an alloy containing a nodularization inhibitor.
  • a suitable base iron for the grey iron charge, excluding carbon is:-
  • the size of the intermediate chamber, the pouring rate of the molten grey iron and the amount of magnesium retained in the cast metal may be determined according to the relationship defined in our U.K. Patent Specification Serial No. 1,511,246.
  • the total area of the base or bases of the chamber or chambers [in cm 2 ] are equal to a x (metal pouring rate) [kg/s] x (total concentration of the vermicularizing agent in the cast metal, expressed as a proportion of the weight of the cast metal) wherein k is a constant depending on the physical form and chemical composition of the vermicularizing agent.
  • the required amount of magnesium can be calculated with great accuracy.
  • the factor can then be determined.
  • the structure obtained is generally not totally vermicular graphite but is about 80% to 90% vermicular.
  • molten metal containing a nodular graphite inhibitor enters the mould system by way of a pouring bush (not shown) down a downsprue 1 and into a reaction chamber 2 which contains the vermicularizing agent.
  • a gate 3 regulates the outflow of metal from the chamber thereby ensuring a sufficient residence time for the metal in the chamber for reaction with the vermicularizing agent therein.
  • the treated molten metal flows via a runner 4 and ingate e.g. 5 to the remainder of the system comprising a riser and the mould cavity proper (not shown).
  • the present invention is further illustrated by the following Example which was carried out using a mould system as described above.
  • the disc casting size was 50.8 cm (20 inches)x2.54 cm (1.0 inch) and the pouring time was ten seconds.
  • the intermediate chamber contained a vermicularizing agent consisting of an alloy comprising 5% magnesium, 0.3 to 0.5% calcium, 0.2% cerium, 45-50% silicon with the balance being iron.
  • the process parameters were selected to give a controlled magnesium content of 0.015%.
  • the required base area of the intermediate chamber is approximately 3.88 cm x3.88 cm (1.53 inchesxl.53 inches).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Claims (2)

1. Verfahren zur Herstellung von Gusseisen mit vermikularem Graphit durch Vergiessen von geschmolzenem grauen, schwefelhaltigen Gusseisen in einen Formenhohlraum, bei dem das Giesssystem wenigstens eine Zwischenkammer enthält, welche ein Magnesium enthaltendes Vermikularisierungsmittel in einer Menge enthält, die ausreicht, den Graphit in einen vermikularen Graphit zu überführen, dadurch gekennzeichnet, dass die Menge des Magnesiums in dem Gussmetall 0,01 bis 0,02% und die Menge an Schwefel in dem Gusseisen 0,01 bis 0,015% beträgt, dass das Vermikularisierungsmittel in der Legierung 5% Magnesium, 0,3 bis 0,5% Calcium, 0,2% Cer und 45 bis 50% Silicium, Rest Eisen, umfasst, und dass das graue Gusseisen eine inhärente Menge an Titan von nur 0,015% enthält.
2.'Verfahren gemäss Anspruch 1, dadurch gekennzeichnet, dass die Menge an Vermikularisierungsmittel in dem gebildeten Gusseisen eingestellt wird, indem man die Verfahrensparameter gemäss der folgenden Beziehung kontrolliert:
Grundfläche oder Grundflächen der Zwischenkammer oder- kammern (in cm2)=
Figure imgb0010
x(Metallgiessrate) [kg/s]x(Gesamtkonzentration des Vermikularisierungsmittels in dem Gussmetall, ausgedrückt als Gewichtsanteil des Gussmetalls), worin k eine Konstante ist, die von der physikalischen Form und der chemischen Zusammensetzung des Vermikularisierungsmittels abhängt.
EP80300136A 1980-01-15 1980-01-15 Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen Expired EP0032282B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8080300136T DE3070892D1 (en) 1980-01-15 1980-01-15 Process for manufacture of cast iron with vermicular graphite and cast iron so produced
AT80300136T ATE14455T1 (de) 1980-01-15 1980-01-15 Verfahren zur herstellung von gusseisen mit vermicular-graphit und nach diesem verfahren hergestelltes gusseisen.
EP80300136A EP0032282B1 (de) 1980-01-15 1980-01-15 Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80300136A EP0032282B1 (de) 1980-01-15 1980-01-15 Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen

Publications (2)

Publication Number Publication Date
EP0032282A1 EP0032282A1 (de) 1981-07-22
EP0032282B1 true EP0032282B1 (de) 1985-07-24

Family

ID=8187077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80300136A Expired EP0032282B1 (de) 1980-01-15 1980-01-15 Verfahren zur Herstellung von Gusseisen mit Vermicular-Graphit und nach diesem Verfahren hergestelltes Gusseisen

Country Status (3)

Country Link
EP (1) EP0032282B1 (de)
AT (1) ATE14455T1 (de)
DE (1) DE3070892D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT398984B (de) * 1986-03-20 1995-02-27 Fischer Ag Georg Verfahren zur herstellung von perlitischen gusseisen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3321312A1 (de) * 1983-06-13 1984-12-13 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur herstellung eines gusseisens mit vermiculargraphit
IT1189162B (it) * 1986-06-11 1988-01-28 Oet Metalconsult Srl Procedimento di trattamento di degasaggio,affinaggio o filtrazione di metalli o leghe allo stato liquido e relativo dispositivo
SE518344C2 (sv) * 2000-01-26 2002-09-24 Novacast Ab Ingjutsystem
BR0105989B1 (pt) * 2001-11-27 2009-08-11 ferro fundido grafìtico de alta resistência mecánica.
BR102016022690B1 (pt) * 2016-09-29 2022-02-08 Tupy S.A. Liga de ferro fundido vermicular para bloco e cabeçote de motor a combustão interna

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020819A1 (de) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Vermicular-Grafit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069058A (en) * 1965-05-04 1967-05-17 Int Nickel Ltd Cast iron
GB1278265A (en) * 1968-07-17 1972-06-21 Materials & Methods Ltd Improved process for the manufacture of nodular cast iron
GB1511246A (en) * 1974-04-29 1978-05-17 Materials & Methods Ltd Process for the manufacture of cast iron
GB1427445A (en) * 1974-01-15 1976-03-10 British Cast Iron Res Ass Cast iron
GB1515201A (en) * 1976-02-10 1978-06-21 British Cast Iron Res Ass Cast iron

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020819A1 (de) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Vermicular-Grafit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT398984B (de) * 1986-03-20 1995-02-27 Fischer Ag Georg Verfahren zur herstellung von perlitischen gusseisen

Also Published As

Publication number Publication date
DE3070892D1 (en) 1985-08-29
EP0032282A1 (de) 1981-07-22
ATE14455T1 (de) 1985-08-15

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