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EP0074979A1 - Procede de preparation de fontes a graphite vermiculaire et dispositif permettant d'executer le procede - Google Patents

Procede de preparation de fontes a graphite vermiculaire et dispositif permettant d'executer le procede

Info

Publication number
EP0074979A1
EP0074979A1 EP82900930A EP82900930A EP0074979A1 EP 0074979 A1 EP0074979 A1 EP 0074979A1 EP 82900930 A EP82900930 A EP 82900930A EP 82900930 A EP82900930 A EP 82900930A EP 0074979 A1 EP0074979 A1 EP 0074979A1
Authority
EP
European Patent Office
Prior art keywords
magnesium
cast iron
melt
content
ratio
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.)
Withdrawn
Application number
EP82900930A
Other languages
German (de)
English (en)
Inventor
Reinhold Linkert
Emil Becker
Horst Hoffmann
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.)
Georg Fischer AG
Original Assignee
Georg Fischer 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 Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0074979A1 publication Critical patent/EP0074979A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C21C1/08—Manufacture of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys

Definitions

  • the invention relates to a method for producing a cast iron with vermicular graphite.
  • Cast iron with vermicular graphite is a relatively new material between cast iron with lamellar graphite (GGL) and cast iron with spheroidal graphite (GGG). Due to its mechanical properties such as tensile strength, toughness and modulus of elasticity, as well as its thermal conductivity, the material GGV can be regarded as particularly suitable for e.g. diesel engine cylinder heads, steel mill molds and turbocharger housings, essentially wherever the parts are subjected to a non-shock-like temperature change. In this respect, GGV is superior to GGL. Compared to the material GGG, GGV has a high thermal conductivity and better casting properties. In particular, the decay effect of the magnesium in the treated cast iron melt is less pronounced, whereby a pouring time of more than 20 minutes can be achieved. The reduced tendency to blow holes and better machinability also speak in favor of GGV.
  • the material GGV can be produced by treating the base melt with magnesium (Mg) or with calcium carbide (CaC 2 ) with a subsequent addition of titanium (Ti) or cerium mixed metal.
  • CaC 2 desulphurization can be seen, for example, from DE-PS 1 911 024 and a titanium addition from DE-OS 15 33 279.
  • Pure magnesium desulfurization has the advantage over CaC 2 desulfurization that the duration of the treatment can be reduced to about 1/5.
  • a separate vessel with an insertion device for, for example, CaC 2 is unnecessary. It is also not advisable to add Ti, among other things because the titanium carbides formed are difficult to dissolve.
  • the method according to the invention can dispense with the harmful addition of Ti.
  • Treatment with pure magnesium is advantageously carried out in a pure magnesium converter, which from the DE-PS
  • the weight of the cast iron to be treated, its S content, and the weight of the pure magnesium addition must be fairly accurate.
  • the temperature in the converter should also be within a tolerance limit of at least ⁇ 20 ° C.
  • the ratio of Mg: S in the range from 0.8-2.5, preferably from 1.2-2.0, is adjusted immediately before the start of casting by adding sulfur iron or Mg master alloy.
  • the best results were obtained with a Mg: S ratio of about 1.8: 1.
  • the optimal ratio of Mg: S must be determined in each foundry and checked at regular intervals.
  • cerium in the form of mixed metal and / or other elements such as Al, Zr, Ca delays spherulitization in pure magnesium treatment and thus expands the area in which GGV forms.

Landscapes

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

Abstract

En vue de preparer des fontes a graphite vermiculaire dans un convertisseur, il est propose d'operer une desulfuration de la fusion primaire au moyen d'un traitement au magnesium pur et d'allier au magnesium, la proportion de Mg au S etant dans le domaine de 0, 8 a 2, 5. L'on peut alors eviter l'utilisation de titane dont les effets secondaires nefastes sont connus. En cas de besoin, il est sans autre possible de passer de la preparation de fontes a graphite spheroidal a la preparation de fontes a graphite vermiculaire et vice-versa; en effet, une modification de l'analyse de depart n'est pas necessaire; a part le fait d'un taux en magnesium residuaire inferieur; en consequence une separation du materiel en circuit n'est pas necessaire.
EP82900930A 1981-03-31 1982-03-30 Procede de preparation de fontes a graphite vermiculaire et dispositif permettant d'executer le procede Withdrawn EP0074979A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2158/81 1981-03-31
CH2158/81A CH656147A5 (de) 1981-03-31 1981-03-31 Verfahren zur herstellung eines gusseisens mit vermiculargraphit.

Publications (1)

Publication Number Publication Date
EP0074979A1 true EP0074979A1 (fr) 1983-03-30

Family

ID=4227235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82900930A Withdrawn EP0074979A1 (fr) 1981-03-31 1982-03-30 Procede de preparation de fontes a graphite vermiculaire et dispositif permettant d'executer le procede

Country Status (21)

Country Link
US (1) US4544407A (fr)
EP (1) EP0074979A1 (fr)
JP (1) JPS58500446A (fr)
AU (1) AU551524B2 (fr)
BR (1) BR8207249A (fr)
CA (1) CA1196500A (fr)
CH (1) CH656147A5 (fr)
DD (1) DD202186A5 (fr)
ES (1) ES8304209A1 (fr)
GR (1) GR75929B (fr)
HU (1) HU186008B (fr)
IL (1) IL65200A (fr)
IT (1) IT1150690B (fr)
PH (1) PH18386A (fr)
PL (1) PL137396B1 (fr)
PT (1) PT74590B (fr)
TR (1) TR21435A (fr)
WO (1) WO1982003410A1 (fr)
YU (1) YU50382A (fr)
ZA (1) ZA821797B (fr)
ZW (1) ZW6482A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3321311A1 (de) * 1983-06-13 1984-12-13 Klöckner-Humboldt-Deutz AG, 5000 Köln Hochlegierter eisen-kohlenstoff-gusswerkstoff mit einem austenitischen grundgefuege
DE3321312A1 (de) * 1983-06-13 1984-12-13 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur herstellung eines gusseisens mit vermiculargraphit
CH660027A5 (de) * 1984-04-13 1987-03-13 Fischer Ag Georg Verfahren und mittel zur herstellung eines gusseisens mit vermiculargraphit.
CH665654A5 (de) * 1985-02-14 1988-05-31 Fischer Ag Georg Verfahren zum freihalten von induktorrinnen, ein- und ausgusskanaelen und dergleichen von ablagerungen.
DE19942780A1 (de) * 1999-09-08 2001-03-15 Bruehl Eisenwerk Zylinderkopf für eine Kolbenbrennkraftmaschine
SE529445C2 (sv) * 2005-12-20 2007-08-14 Novacast Technologies Ab Process för framställning av kompaktgrafitjärn
DE112014004110T5 (de) * 2013-09-06 2016-06-09 Toshiba Kikai Kabushiki Kaisha Spheroidisierbehandlungsverfahren für geschmolzenes Metall aus Gusseisen mit Kugelgraphit
PL234793B1 (pl) * 2017-06-24 2020-04-30 Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie Sposób modyfikowania struktury pierwotnej żeliwa z grafitem wermikularnym na odlewy cienkościenne

Family Cites Families (14)

* 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
NL6606067A (fr) * 1965-05-04 1966-11-07
DE1815214C3 (de) * 1968-01-26 1975-06-19 Georg Fischer Ag, Schaffhausen (Schweiz) 03.12.68 Schweiz 17961-68 Kippbares BehandlungsgefäB zum Behandeln von Metall-Schmelzen durch Einbringen verdampfbarer Zusätze, insbesondere zum Herstellen von Eisen-Kohlenstoff-GuBwerkstoffen mit Kugelgraphit durch Einbringen von Reinmagnesium in die im Gefäß enthaltene Schmelze Georg Fischer AG, Schaffhausen (Schweiz)
AT290592B (de) * 1968-05-03 1971-06-11 Ver Fuer Praktische Giessereif Verfahren zur Herstellung eines Gußeisens mit Vermicular-Graphit
US3833361A (en) * 1970-07-06 1974-09-03 Kusaka Rare Metal Prod Co Ltd Method for adding special elements to molten pig iron
CH549095A (de) * 1971-03-31 1974-05-15 Fischer Ag Georg Verfahren und vorrichtung zur erzeugung von gusseisen mit kugelgraphit.
CH522459A (de) * 1971-04-23 1972-06-30 Fischer Ag Georg Kippbarer Giessbehälter zur Behandlung einer Eisen-Kohlenstoffschmelze mit verdampfbaren Zusätzen
US3955973A (en) * 1974-05-20 1976-05-11 Deere & Company Process of making nodular iron and after-treating alloy utilized therein
DE2458033B2 (de) * 1974-12-07 1977-10-13 Buderus'sche Eisenwerke, 6330 Wetzlar Verfahren zur herstellung eines gusseisens mit vermikulargraphit
US3998625A (en) * 1975-11-12 1976-12-21 Jones & Laughlin Steel Corporation Desulfurization method
US4094666A (en) * 1977-05-24 1978-06-13 Metal Research Corporation Method for refining molten iron and steels
RO71368A2 (fr) * 1979-02-16 1981-08-30 Institutul De Cercetaresstiintifica,Inginerie Tehnologica Si Proiectare Pentru Sectoare Calde,Ro Procede d'elaboration des fontes a graphite vermiculaire par double modification
US4205981A (en) * 1979-02-28 1980-06-03 International Harvester Company Method for ladle treatment of molten cast iron using sheathed magnesium wire
DE2926020A1 (de) * 1979-06-28 1981-01-08 Buderus Ag Verfahren zur herstellung eines gusseisens mit vermicular-grafit und verwendung des gusseisens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203410A1 *

Also Published As

Publication number Publication date
JPS58500446A (ja) 1983-03-24
PH18386A (en) 1985-06-19
ZW6482A1 (en) 1983-08-31
WO1982003410A1 (fr) 1982-10-14
PT74590A (en) 1982-04-01
IT8220210A0 (it) 1982-03-16
GR75929B (fr) 1984-08-02
PL235701A1 (en) 1983-01-17
TR21435A (tr) 1984-06-04
IL65200A0 (en) 1982-05-31
YU50382A (en) 1985-04-30
PL137396B1 (en) 1986-05-31
CA1196500A (fr) 1985-11-12
HU186008B (en) 1985-05-28
ES510940A0 (es) 1983-02-16
US4544407A (en) 1985-10-01
BR8207249A (pt) 1983-03-01
CH656147A5 (de) 1986-06-13
DD202186A5 (de) 1983-08-31
ES8304209A1 (es) 1983-02-16
IL65200A (en) 1985-11-29
IT1150690B (it) 1986-12-17
AU8270382A (en) 1982-10-19
ZA821797B (en) 1983-02-23
PT74590B (en) 1983-09-27
AU551524B2 (en) 1986-05-01

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19821113

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19840817

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOFFMANN, HORST

Inventor name: BECKER, EMIL

Inventor name: LINKERT, REINHOLD