EP0032282B1 - Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue - Google Patents

Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue 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
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.)
Expired
Application number
EP80300136A
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German (de)
English (en)
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EP0032282A1 (fr
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
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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 EP80300136A priority Critical patent/EP0032282B1/fr
Priority to DE8080300136T priority patent/DE3070892D1/de
Priority to AT80300136T priority patent/ATE14455T1/de
Publication of EP0032282A1 publication Critical patent/EP0032282A1/fr
Application granted granted Critical
Publication of EP0032282B1 publication Critical patent/EP0032282B1/fr
Expired legal-status Critical Current

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    • 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).

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  • 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. Procédé de fabrication de fonte à graphite vermiculaire par coulée d'une fonte grise fondue, contenant du soufre, dans une empreinte de moule, le système de coulée comportant au moins une chambre intermédiaire contenant un agent vermicularisant contenant du magnésium en une quantité suffisante pour convertir le graphite en graphite vermiculaire, procédé caractérisé en ce que la concentration du magnésium dans le métal de coulée est de 0,01 à 0,02% et la concentration du soufre dans la fonte est de 0,01 à 0,015%; en ce que l'agent vermicularisant est un alliage comprenant 5% de magnésium, 0,3 à 0,5% de calcium, 0,2% de cérium et 45-50% de silicium, le reste étant du fer; et en ce que la fonte grise contient une quantité inhérente de titane de seulement 0,015%.
2. Procédé selon la revendication 1, caractérisé en ce que la quantité d'agent vermicularisant dans la fonte résultante est réglée en choisissant les paramètres du processus suivant la relation:
surface de la base, ou des bases, de la chambre, ou des chambres, intermédiaires (en cm2)=
Figure imgb0011
x (vitesse totale de coulée) [kg/s] x (concentration totale de l'agent vermicularisant dans le métal de coulée, exprimée en proportion du poids du métal de coulée), où k est une constante qui dépend de la forme physique et de la composition chimique de l'agent vermicularisant.
EP80300136A 1980-01-15 1980-01-15 Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue Expired EP0032282B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP80300136A EP0032282B1 (fr) 1980-01-15 1980-01-15 Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue
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.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80300136A EP0032282B1 (fr) 1980-01-15 1980-01-15 Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue

Publications (2)

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

Family

ID=8187077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80300136A Expired EP0032282B1 (fr) 1980-01-15 1980-01-15 Procédé de fabrication de fonte à graphite vermiculaire et fonte ainsi obtenue

Country Status (3)

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

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 (fr) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Procédé de fabrication de pièces coulées en fonte à graphite vermiculaire

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 (fr) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Procédé de fabrication de pièces coulées en fonte à graphite vermiculaire

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
EP0032282A1 (fr) 1981-07-22
DE3070892D1 (en) 1985-08-29
ATE14455T1 (de) 1985-08-15

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