WO1982003410A1 - Method for the preparation of vermicular graphite cast iron and device allowing to implement such method - Google Patents

Method for the preparation of vermicular graphite cast iron and device allowing to implement such method Download PDF

Info

Publication number
WO1982003410A1
WO1982003410A1 PCT/CH1982/000050 CH8200050W WO8203410A1 WO 1982003410 A1 WO1982003410 A1 WO 1982003410A1 CH 8200050 W CH8200050 W CH 8200050W WO 8203410 A1 WO8203410 A1 WO 8203410A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnesium
cast iron
melt
content
ratio
Prior art date
Application number
PCT/CH1982/000050
Other languages
German (de)
French (fr)
Inventor
Ag Georg Fischer
Original Assignee
Linkert Reinhold
Becker Emil
Hoffmann Horst
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
Priority to IN281/CAL/82A priority Critical patent/IN158851B/en
Application filed by Linkert Reinhold, Becker Emil, Hoffmann Horst filed Critical Linkert Reinhold
Priority to BR8207249A priority patent/BR8207249A/en
Publication of WO1982003410A1 publication Critical patent/WO1982003410A1/en
Priority to FI824105A priority patent/FI824105A0/en

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

In order to prepare vermicular graphite cast iron in a converter, it is proposed to operate a disulphurization of the primary melting by treating with pure magnesium and alloying to the magnesium, the proportion of Mg to S being in the range from 0.8 to 2.5. The use of titanium of which the bad side effects are known may be avoided. If need be, it is quite possible to pass from the preparation of spheroidal graphite cast iron to the preparation of vermicular graphite cast iron and vice-versa; as a fact, a modification of the starting analysis is not necessary, except for a lower residual magnesium ratio; consequently, a separation of the material in process is not necessary.

Description

Verfahren zur Herstellung eines Gusseisens mit Vermiculargraphit und Vorrichtung zur Durchführung des Verfahrens Process for producing a cast iron with vermicular graphite and device for carrying out the process
Die Erfindung betrifft ein Verfahren zur Herstellung eines Gusseisens mit Vermiculargraphit.The invention relates to a method for producing a cast iron with vermicular graphite.
Gusseisen mit Vermiculargraphit (GGV) ist als relativ neuartiger Werkstoff zwischen Gusseisen mit Lamellengraphit (GGL) und Gusseisen mit Kugelgraphit (GGG) anzusiedeln. Wegen seiner mechanischen Eigenschaften wie Zugfestigkeit, Zähigkeit und Elastizitätsmodul sowie wegen seiner Wärmeleitfähigkeit kann der Werkstoff GGV für z.B. Dieselmotorzylinderkcpfe, Stahlwerkskokillen und Turboladergehäuse als besonders geeignet betrachtet werden, im wesentlichen überall, wo die Teile einem nicht schockartigen Temperaturwechsel unterworfen sind. In dieser Beziehung ist GGV dem Werkstoff GGL überlegen. Gegenüber dem Werkstoff GGG weist GGV sich durch eine hohe Wärmeleitfähigkeit und durch bessere giesstechnische Eigenschaften aus. Insbesondere ist der Abklingeffekt des Magnesiums in der behandelten Gusseisenschmelze weniger ausgeprägt, wodurch eine Ve.rgiesszeit bis mehr als 20 Min. erreicht werden kann. Auch die verringerte Lunkerneigung und die bessere Bearbeitbarkeit sprechen für GGV.Cast iron with vermicular graphite (GGV) 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.
Der Werkstoff GGV ist herstellbar, indem eine Behandlung der Grundschmelze mit Magnesium (Mg) oder mit Calciumcarbid (CaC2) mit einem nachfolgenden Zusatz von Titan (Ti) oder von Cer-Mischmetall durchgeführt wird. Eine CaC2-Entschwefelung geht z.B. aus der DE-PS 1 911 024 und eine Titan-Zugabe aus der DE-OS 15 33 279 hervor.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.
Aus der DE-OS 24 58 033 ist ein einschlägiges Verfahren bekannt, demgemäss eine Ausgangsschmelze mit Mg vorbehandelt wird, bis der Schwefelgehalt auf 0,01 % S sinkt und wobei die Zeit zwischen der Mg-Behandlung und dem Zusatz von Seltenerdmetallen so bemessen ist, dass keine Kugelgraphitbildung stattfindet. Nicht erläutert ist, wie diese Zeit zu bestimmen sei. Diese Schrift lehrt ebenfalls, dass eine gewünschte Vermiculargraphitbildung durch reines Mg nicht hervorgerufen werden kann.A relevant process is known from DE-OS 24 58 033, according to which a starting melt is pretreated with Mg until the sulfur content drops to 0.01% S and the time between the Mg treatment and the addition of rare earth metals is such that that there is no spheroidal graphite formation. How this time should be determined is not explained. This document also teaches that a desired formation of vermicular graphite cannot be caused by pure Mg.
Es ist Aufgabe der vorliegenden Erfindung, die obengenannten Nachteile zu vermeiden und ausgehend vom Stand der Technik ein Verfahren samt Vorrichtung vorzuschlagen, mit denen auf schnelle, wirtschaftliche und treffsichere Art ein Gusseisen mit Vermiculargraphit herstellbar ist.It is an object of the present invention to avoid the disadvantages mentioned above and, based on the prior art, to propose a method and device with which a cast iron with vermicular graphite can be produced in a quick, economical and accurate manner.
Diese Aufgabe wird erfindungsgemäss gelöst durch die Merkmale im kennzeichnenden Teil des 1. Anspruches. Vorteilhafte Weiterbildungen gehen aus den abhängigen Ansprüchen hervor. Es wurde nämlich, entgegen dem Befund der obengenannten DE-OS 24 58 033 nachgewiesen, dass die Herstellung des Werkstoffs GGV im Anschluss an eine Reinmagnesiumentschwefelung möglich ist.This object is achieved according to the invention by the features in the characterizing part of claim 1. Advantageous further developments emerge from the dependent claims. It has been proven, contrary to the finding of the above-mentioned DE-OS 24 58 033, that the production of the material GGV is possible after a pure magnesium desulfurization.
Die Reinmagnesiumentschwefelung hat gegenüber der CaC2- Entschwefelung den Vorteil, dass die Dauer der Behandlung auf etwa 1/5 verkürzt werden kann.Pure magnesium desulfurization has the advantage over CaC 2 desulfurization that the duration of the treatment can be reduced to about 1/5.
Ausserdem haben diejenigen Giessereien einen grossen Vorteil, die bereits in ihrem Betrieb einen Reinmagnesiumkonverter zur Herstellung von Gusseisen mit Kugelgraphit installiert haben. Es ist dann möglich, kurzfristig und, falls erforderlich, nur für kürzere Zeit auf die Herstellung des Werkstoffs GGV umzustellen; dies bedarf nur einer entsprechenden Gewichtsreduktion des zugegebenen Reinmagnesiums. Das ist insbesondere deshalb interessant, da die Nachfrage von GGV verglichen mit GGG noch nicht gross ist.In addition, foundries that have already installed a pure magnesium converter for the production of cast iron with nodular graphite have a great advantage. It is then possible to switch to the production of the material GGV at short notice and, if necessary, only for a short time; this only requires a corresponding weight reduction of the pure magnesium added. This is particularly interesting because the demand from GGV is not yet great compared to GGG.
Ein separates Gefäss mit einer Einbringvorrichtung für z.B. CaC2 erübrigt sich. Des weiteren ist von einer Ti-Zugabe abzuraten, u.a. da die gebildeten Titancarbide schwer löslich sind. Das erfindungsgemässe Verfahren kann auf den schädlichen Zusatz von Ti verzichten.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.
Ausgangsschmelzen, welche nach dem erfindungsgemässen Verfahren behandelt werden können, weisen typischerweise folgende Zusammensetzung auf:Starting melts which can be treated by the process according to the invention typically have the following composition:
3,4 ≤%C ≤4,0; / 2,0≤% Si ≤3,0, / 0,1 ≤ % Mn ≤ 0,6; 0,02 ≤ % S; / Rest Eisen mit den üblichen Verunreinigungen. Die Behandlung mit Reinmagnesium erfolgt vorteilhafterweise in einem Reinmagnesium-Konverter, der aus den DE-PS3.4 ≤% C ≤4.0; / 2.0 ≤% Si ≤ 3.0, / 0.1 ≤% Mn ≤ 0.6; 0.02 ≤% S; / Rest of iron with the usual impurities. Treatment with pure magnesium is advantageously carried out in a pure magnesium converter, which from the DE-PS
18 15 214, 22 16 796 und 22 15 416 bekannt ist, bei einer18 15 214, 22 16 796 and 22 15 416 is known at one
Temperatur von 1450 - 1520° C und ergibt typischerweise eine Analyse von:Temperature of 1450 - 1520 ° C and typically results in an analysis of:
3,4 ≤% C ≤4,O; / 2,0 ≤% Si ≤ 3,0, / 0,1 ≤% Mn ≤0,6; /3.4 ≤% C ≤4, O; / 2.0 ≤% Si ≤ 3.0, / 0.1 ≤% Mn ≤0.6; /
0,010 ≤% Mg - ≤,025; / 0,005 ≤ % S ≤0,015; / Rest Eisen mit den üblichen Verunreinigungen.0.010 ≤% Mg - ≤, 025; / 0.005 ≤% S ≤0.015; / Rest of iron with the usual impurities.
Eine hohe Arbeitsgenauigkeit ist erforderlich. So muss das Gewicht des zu behandelnden Gusseisens, dessen S-Ge-halt, und das Gewicht der Reinmagnesiumzugabe ziemlich genau vorliegen. Auch soll die Temperatur im Konverter iinnnneerrhhcalb einer Toleranzgrenze von mindestens ± 20º C liegen.A high level of work accuracy is required. For example, 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.
Ausgehend von der nach der Reinmagnesiumbehandlung vorliegenden Analyse wird unmittelbar vor Giessbeginn das Verhältnis von Mg:S im Bereich von 0,8 - 2,5, vorzugsweise von 1,2 - 2,0 durch Zugabe von Schwefeleisen oder Mg-Vorlegierung eingestellt. Die besten Resultate wurden mit einem Verhältnis von Mg:S von etwa 1,8:1 erhalten. Das optimale Verhältnis von Mg:S muss in jeder Giesserei selbst ermittelt und in regelmässigen Abständen überprüft werden.On the basis of the analysis available after the pure magnesium treatment, 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.
Es hat sich gezeigt, dass eine Cer-Zugabe in Form von Mischmetall und/oder anderer Ξlemente wie AI, Zr, Ca die Sphärolitisierung bei der Reinmagnesiumbehandlung verzögern und damit den Bereich in dem sich GGV bildet erweitert.It has been shown that the addition of 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.
Bei einwandfreien Herstellbedingungen (Zurückhalten der Behandlungsschlacke im Konverter, in der Transport- und/ oder Giesspfanne, nicht übermässiger Kontakt mit dem Luftsauerstoff, Schutz gegen zu schnelles Abkühlen) wurden bei betriebseigenen Versuchen VergiessZeiten von über 20 Min. erreicht. With perfect manufacturing conditions (retention of the treatment slag in the converter, in the transport and / or pouring ladle, not excessive contact with the atmospheric oxygen, protection against cooling too quickly), casting times of over 20 minutes were achieved in the company's own tests.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zur Herstellung eines Gusseisens mit Vermiculargraphit in einem Konverter, dadurch gekennzeichnet, dass eine Ausgangsschmelze mit einem Schwefelgehalt von bis zu 0,3 % durch eine Reinmagnesiumbehandlung entschwefelt und mit Magnesium legiert und das Verhältnis von Mg zu S gegebenenfalls mehrstufig auf einen Wert von 0,8 bis 2,5 eingestellt wird.1. A process for producing a cast iron with vermicular graphite in a converter, characterized in that a starting melt with a sulfur content of up to 0.3% is desulfurized by a pure magnesium treatment and alloyed with magnesium and the ratio of Mg to S, if necessary in several stages, to a value of 0.8 to 2.5 is set.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis Mg zu S 1,2 - 2,0 beträgt.2. The method according to claim 1, characterized in that the ratio of Mg to S is 1.2 - 2.0.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einstellung des Mg/S-Verhältnisses durch vorzugsweise Nickelmagnesium erfolgt.3. The method according to claim 1 or 2, characterized in that the setting of the Mg / S ratio is carried out by preferably nickel magnesium.
4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass die Einstellung des Mg/S-Verhältnisses durch Zugabe von Schwefel, vorzugsweise von Schwefeleisen erfolgt.4. The method according to claim 1 to 3, characterized in that the setting of the Mg / S ratio is carried out by adding sulfur, preferably sulfur iron.
5. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet. dass der zu behandelnden Schmelze seltene Erden zugegeben werden.5. The method according to claim 1 to 4, characterized. that rare earths are added to the melt to be treated.
6. Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, dass der zu behandelnden Schmelze als Zusatz Cer-MM und/oder AI und/oder Zr und/oder Ca z.B. in Form von CaSi zugegeben wird.6. The method according to claim 1 to 5, characterized in that the melt to be treated as an additive Cer-MM and / or Al and / or Zr and / or Ca e.g. is added in the form of CaSi.
7. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, dass der Mg-Gehalt der Schmelze derart gesteuert wird, dass bei hohem Mg-Gehalt zur Senkung des Mg-Wertes schwefelhaltiges Eisen und bei tiefem Mg-Gehalt zur Erhöhung des Mg-Wertes eine Magnesiumvorlegierung wie z.B. eine Ni-Mg-Legierung zugegeben wird, so dass der Magnesiumgehalt der Schmelze im Bereich von 0,010 - 0,025 % eingestellt werden kann.7. The method according to claim 1 to 6, characterized in that the Mg content of the melt is controlled such that when the Mg content is high to reduce the Mg value, sulfur-containing iron and when the Mg content is low to increase the Mg value Magnesium master alloy such as a Ni-Mg alloy is added so that the magnesium content of the melt can be set in the range from 0.010 to 0.025%.
8. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bis 7, gekennzeichnet durch ein kippbares Behandlungsgefäss mit einer in einem Bodeneckbereich eingebauten Reaktionskammer, wobei die Kammer eine verschliessbare Oeffnung für die Zufuhr von Reinmagnesium in der Wand des Gefässes aufweist (DE-PS8. An apparatus for performing the method according to claim 1 to 7, characterized by a tiltable treatment vessel with a reaction chamber installed in a bottom corner area, the chamber having a closable opening for the supply of pure magnesium in the wall of the vessel (DE-PS
1 815 214 und 2 219 740). 1 815 214 and 2 219 740).
PCT/CH1982/000050 1981-03-31 1982-03-30 Method for the preparation of vermicular graphite cast iron and device allowing to implement such method WO1982003410A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IN281/CAL/82A IN158851B (en) 1981-03-31 1982-03-12
BR8207249A BR8207249A (en) 1981-03-31 1982-03-30 PROCESS FOR THE PRODUCTION OF PIECES CASTED IN IRON WITH A GRAPHITE GRAPHITE STRUCTURE AND AN APPLIANCE TO CARRY OUT THE PROCESS
FI824105A FI824105A0 (en) 1981-03-31 1982-11-29 REFERENCE FOR A FRAME RELEASE WITH A VERMIKULAER GRAPHIC ORGANIZATION FOR THE FUNCTION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2158/81A CH656147A5 (en) 1981-03-31 1981-03-31 METHOD FOR PRODUCING A CAST IRON WITH VERMICULAR GRAPHITE.
CH2158/81810331 1981-03-31

Publications (1)

Publication Number Publication Date
WO1982003410A1 true WO1982003410A1 (en) 1982-10-14

Family

ID=4227235

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1982/000050 WO1982003410A1 (en) 1981-03-31 1982-03-30 Method for the preparation of vermicular graphite cast iron and device allowing to implement such method

Country Status (21)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131091A2 (en) * 1983-06-13 1985-01-16 Klöckner-Humboldt-Deutz Aktiengesellschaft High-alloy iron-carbon cast material with an austenitic matrix
EP0131092A2 (en) * 1983-06-13 1985-01-16 Klöckner-Humboldt-Deutz Aktiengesellschaft Process for producing vermicular graphite cast iron
FR2562910A1 (en) * 1984-04-13 1985-10-18 Fischer Ag Georg METHOD AND DEVICE FOR MANUFACTURING VERMICULAR GRAPHITE MOLDING MOLD
GB2171116A (en) * 1985-02-14 1986-08-20 Fischer Ag Georg Addition of pure magnesium to cast iron melt

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19942780A1 (en) * 1999-09-08 2001-03-15 Bruehl Eisenwerk Cylinder head for a piston internal combustion engine
SE529445C2 (en) * 2005-12-20 2007-08-14 Novacast Technologies Ab Process for making compact graphite iron
KR101708583B1 (en) * 2013-09-06 2017-02-20 도시바 기카이 가부시키가이샤 Method for spheroidizing molten metal of spheroidal graphite cast iron
PL234793B1 (en) * 2017-06-24 2020-04-30 Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie Method for modification of primary structure of cast iron with vermicular graphite intended for thin-walled castings

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE680503A (en) * 1965-05-04 1966-11-04
US3421886A (en) * 1965-05-04 1969-01-14 Int Nickel Co Cast iron with at least 50% of the graphite in vermicular form and a process for making same
DE1815214A1 (en) * 1968-01-26 1969-12-11 Fischer Ag Georg Process for introducing vaporizable additives into a melt and device for carrying out the process
FR2007780A1 (en) * 1968-05-03 1970-01-09 Bremanger Smelteverk
DE2458033A1 (en) * 1974-12-07 1976-06-10 Buderus Eisenwerk Cast iron with vermicular graphite - produced without spheroidisation by rare earth metal treatment preceded by magnesium treatment
DE2937321A1 (en) * 1979-02-16 1980-08-21 Inst Cercetari Stiintifice METHOD FOR PRODUCING CAST IRON WITH VERMICULLARGRAPHITE BY MEANS OF DOUBLE MODIFICATION
EP0020819A1 (en) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Process for manufacturing castings of cast iron with vermicular graphite

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833361A (en) * 1970-07-06 1974-09-03 Kusaka Rare Metal Prod Co Ltd Method for adding special elements to molten pig iron
CH549095A (en) * 1971-03-31 1974-05-15 Fischer Ag Georg METHOD AND DEVICE FOR THE PRODUCTION OF CAST IRON WITH BALL GRAPHITE.
CH522459A (en) * 1971-04-23 1972-06-30 Fischer Ag Georg Tiltable casting container for treating iron-carbon melt with vaporizable additives
US3955973A (en) * 1974-05-20 1976-05-11 Deere & Company Process of making nodular iron and after-treating alloy utilized therein
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
US4205981A (en) * 1979-02-28 1980-06-03 International Harvester Company Method for ladle treatment of molten cast iron using sheathed magnesium wire

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE680503A (en) * 1965-05-04 1966-11-04
US3421886A (en) * 1965-05-04 1969-01-14 Int Nickel Co Cast iron with at least 50% of the graphite in vermicular form and a process for making same
DE1815214A1 (en) * 1968-01-26 1969-12-11 Fischer Ag Georg Process for introducing vaporizable additives into a melt and device for carrying out the process
FR2007780A1 (en) * 1968-05-03 1970-01-09 Bremanger Smelteverk
DE2458033A1 (en) * 1974-12-07 1976-06-10 Buderus Eisenwerk Cast iron with vermicular graphite - produced without spheroidisation by rare earth metal treatment preceded by magnesium treatment
DE2937321A1 (en) * 1979-02-16 1980-08-21 Inst Cercetari Stiintifice METHOD FOR PRODUCING CAST IRON WITH VERMICULLARGRAPHITE BY MEANS OF DOUBLE MODIFICATION
EP0020819A1 (en) * 1979-06-28 1981-01-07 Buderus Aktiengesellschaft Process for manufacturing castings of cast iron with vermicular graphite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Giessereipraxis, No. 5, March 1981, Berlin (DE), D.M. STEFANESCU et al.: "Neue Fortschritte auf dem Gebiet des Gusseisens mit Vermiculargraphit", pages 73-96, see page 84, left-hand column, paragraph 3; page 77, left-hand column last paragraph *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131091A2 (en) * 1983-06-13 1985-01-16 Klöckner-Humboldt-Deutz Aktiengesellschaft High-alloy iron-carbon cast material with an austenitic matrix
EP0131092A2 (en) * 1983-06-13 1985-01-16 Klöckner-Humboldt-Deutz Aktiengesellschaft Process for producing vermicular graphite cast iron
EP0131091A3 (en) * 1983-06-13 1986-09-03 Klöckner-Humboldt-Deutz Aktiengesellschaft High-alloy iron-carbon cast material with an austenitic matrix
EP0131092A3 (en) * 1983-06-13 1986-09-10 Klöckner-Humboldt-Deutz Aktiengesellschaft Process for producing vermicular graphite cast iron
FR2562910A1 (en) * 1984-04-13 1985-10-18 Fischer Ag Georg METHOD AND DEVICE FOR MANUFACTURING VERMICULAR GRAPHITE MOLDING MOLD
GB2157321A (en) * 1984-04-13 1985-10-23 Fischer Ag Georg Production of vermicular graphite iron
AU576561B2 (en) * 1984-04-13 1988-09-01 Georg Fischer Aktiengesellschaft Production of cast iron with vermicular graphite
AT392482B (en) * 1984-04-13 1991-04-10 Fischer Ag Georg METHOD FOR PRODUCING A CAST IRON WITH VERMICULAR GRAPHITE
GB2171116A (en) * 1985-02-14 1986-08-20 Fischer Ag Georg Addition of pure magnesium to cast iron melt
FR2578268A1 (en) * 1985-02-14 1986-09-05 Fischer Ag Georg METHOD FOR PREVENTING THE FORMATION OF DEPOSITS IN INDUCER RIGOLES, CASTING DESCENTS, CASTING CHANNELS AND THE LIKE, USING THE SAME, AND DEVICE FOR CARRYING OUT SAID METHOD

Also Published As

Publication number Publication date
PT74590A (en) 1982-04-01
IT8220210A0 (en) 1982-03-16
HU186008B (en) 1985-05-28
PH18386A (en) 1985-06-19
IL65200A (en) 1985-11-29
PT74590B (en) 1983-09-27
BR8207249A (en) 1983-03-01
YU50382A (en) 1985-04-30
GR75929B (en) 1984-08-02
JPS58500446A (en) 1983-03-24
IL65200A0 (en) 1982-05-31
ES510940A0 (en) 1983-02-16
PL137396B1 (en) 1986-05-31
IT1150690B (en) 1986-12-17
ZW6482A1 (en) 1983-08-31
AU8270382A (en) 1982-10-19
CA1196500A (en) 1985-11-12
AU551524B2 (en) 1986-05-01
DD202186A5 (en) 1983-08-31
CH656147A5 (en) 1986-06-13
US4544407A (en) 1985-10-01
EP0074979A1 (en) 1983-03-30
ES8304209A1 (en) 1983-02-16
TR21435A (en) 1984-06-04
ZA821797B (en) 1983-02-23
PL235701A1 (en) 1983-01-17

Similar Documents

Publication Publication Date Title
DE69517927T2 (en) Process for the production of titanium-containing steels and steels produced by this process
DE2322604C3 (en) Process for the desulfurization of molten steel that has been completely deoxidized in the ladle
WO1982003410A1 (en) Method for the preparation of vermicular graphite cast iron and device allowing to implement such method
EP0141804B1 (en) Hadfield type manganese steel and process for the manufacture thereof
DE69806553T2 (en) Carbon steel or low alloy steel with improved machinability and process for producing this steel
DE2611247C3 (en) Cast iron manufacturing process
AT392482B (en) METHOD FOR PRODUCING A CAST IRON WITH VERMICULAR GRAPHITE
DE3603277C1 (en) Method of producing cast iron using spheroidal graphite
EP0046991B1 (en) Process and briquette for homogenizing molten cast iron
DE4033182C2 (en)
DE3409550C1 (en) Inoculating alloy for the production of spherulitic cast iron
DE760239C (en) Process for making alloy steel
DE2757444A1 (en) METHOD FOR PRODUCING CAST IRON FOR CASTING IN A FOUNDRY
DE2757114A1 (en) PROCESS FOR MANUFACTURING HIGH STRENGTH GRAPHITE CASTING
DE19502302A1 (en) Means for the desulfurization of molten iron
DE1758706A1 (en) Use of steel iron as a factory sump for steel mill molds
DE1458423B2 (en) ADDITIVES FOR THE MANUFACTURE OF GRAPHIC SPHERICAL CAST IRON
CH594057A5 (en) Modifying agent for cast iron and steel - is based on silicon and contains calcium, iron, a rare earth and magnesium of low concn. (SF 31.12.75)
DE2926020A1 (en) METHOD FOR PRODUCING A CAST IRON WITH VERMICULAR GRAFIT AND USE OF THE CAST IRON
DE2250165B2 (en) NODULATING COMPOSITION FOR USE IN THE MANUFACTURING OF CAST IRON WITH SPHERICAL GRAPHITE
DE973707C (en) Process for producing alloyed steels
DE900457C (en) Melting a cast iron suitable for the production of permanent molds in a foundry shaft furnace
AT287761B (en) Process for the production of cast iron suitable for permanent mold casting
DE2942576C2 (en) Process for the joint production of metal alloys and zirconium corundum
EP1676929B2 (en) Process of manufacturing compacted graphite cast iron

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AU BR DK FI HU JP KP NO RO SU US

AL Designated countries for regional patents

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

WWE Wipo information: entry into national phase

Ref document number: 1982900930

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 824105

Country of ref document: FI

WWP Wipo information: published in national office

Ref document number: 1982900930

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1982900930

Country of ref document: EP