EP0353804A1 - Process for the production of cast iron with spheroidal graphite and/or vermicular graphite - Google Patents

Process for the production of cast iron with spheroidal graphite and/or vermicular graphite Download PDF

Info

Publication number
EP0353804A1
EP0353804A1 EP89201831A EP89201831A EP0353804A1 EP 0353804 A1 EP0353804 A1 EP 0353804A1 EP 89201831 A EP89201831 A EP 89201831A EP 89201831 A EP89201831 A EP 89201831A EP 0353804 A1 EP0353804 A1 EP 0353804A1
Authority
EP
European Patent Office
Prior art keywords
magnesium
cast iron
treatment agent
graphite
earth metals
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
EP89201831A
Other languages
German (de)
French (fr)
Other versions
EP0353804B1 (en
Inventor
Jürgen Klaus Dr. Best
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
Metallgesellschaft 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 SKW Trostberg AG, Metallgesellschaft AG filed Critical SKW Trostberg AG
Publication of EP0353804A1 publication Critical patent/EP0353804A1/en
Application granted granted Critical
Publication of EP0353804B1 publication Critical patent/EP0353804B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel
    • 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
    • C21C1/105—Nodularising additive agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite

Definitions

  • the invention relates to a process for producing cast iron with spheroidal graphite and / or vermicular graphite by treating the molten cast iron with a treatment agent containing magnesium or magnesium and rare earth metals.
  • spheroidal graphite cast iron it is known to treat the molten cast iron with spheroidal graphite-inducing elements such as alkali or alkaline earth metals, magnesium or rare earth metals.
  • spheroidal graphite-inducing elements such as alkali or alkaline earth metals, magnesium or rare earth metals.
  • the latter two are preferred in technical practice.
  • Magnesium can be used in a pure metallic form, using suitable devices that safely take into account the high reactivity of the metal during the melt treatment.
  • Magnesium-containing master alloys which are used, for example, as melt-cast moldings or as pressed powder bodies or briquettes, are usually simplified in the immersion process or by pouring.
  • Magnesium-containing treatment agents are also known as so-called cored wires, the powdered alloy being a pressed core wire and surrounded by a high-melting metal sheath, such as a steel sheath (DE-AS 26 03 412).
  • Alloy components of magnesium or rare earth metals are predominantly calcium, aluminum, silicon, nickel and iron.
  • Typical alloys have, for example, the composition 5.5 to 6.5% Mg, 1.5 to 2.5% Ca, 0.5 to 1.5% Al, 45 to 50% Si, balance Fe.
  • the invention has for its object to provide a treatment method for cast iron melts using a magnesium-containing treatment agent, in which the base melt does not experience any significant deviation from its directional analysis even when the agent is added excessively.
  • the invention solves the problem, starting from a method for producing cast iron with spheroidal graphite and / or with vermicular graphite by treating the molten cast iron with a magnesium-containing treatment agent.
  • the invention consists in that a treatment agent containing magnesium or magnesium and rare earth metals is used, the composition of which is carried out with the proviso that the components, with the exception of the magnesium or the magnesium and the rare earth metals, in the ratio (in% by weight) contained therein, which corresponds to the ratio (in% by weight) of the alloy components in the cast iron alloy to be treated.
  • Suitable magnesium-containing treatment agents in the process of the invention are those of the composition: 1.00 to 45.00 % By weight magnesium 3.00 to 5.00 “ carbon 1.50 to 6.00 " Silicon 0.10 to 0.60 " manganese Max. 0.05 " phosphorus Max. 0.01 " sulfur 0 to 5.00 " Rare earth metals 0 to 0.20 “ titanium 0 to 6.00 “ chrome 0 to 1.00 “ copper 0 to 40.00 " nickel rest iron
  • the magnesium-containing treatment agent used in the process of the invention must contain, in particular, carbon, silicon and manganese as essential components.
  • Cast iron melts suitable for treatment according to the method of the invention are, for example, those for the production of spheroidal graphite cast iron of the analysis: 3.7 wt% C 2.5 "Si 0.25 "Mn 0.008 "S 0.020 “P 0.040 "Mg 0.02 "Ti Rest of Fe or cast iron smelting for the production of cast iron with vermicular graphite of the analysis: 3.6 wt% C 2.6 "Si 0.20 "Mn 0.010 "S 0.020 “P 0.025 “Mg 0.16 "Ti Rest of Fe or cast iron smelting for the production of alloyed cast iron with spheroidal graphite Analysis: 2.6 wt% C 4.5 "Si 0.60 "Mn 30.0 "Ni 2.0 "Cr 0.050 "Mg Rest of Fe
  • the Mg-containing treatment agent used in the process of the invention is produced by methods known per se.
  • the individual components are brought into powder form and the various powders are mixed to the desired composition, such as powder made of graphite, magnesium, FeSiMg, iron powder to form a treatment agent, for example the composition: 3.6% by weight C, 2.2% by weight. % Si, 0.11% by weight Mn, 16.0% by weight Mg, 0.1% by weight Cu, balance Fe.
  • the treatment agent obtained with the specified composition can then be used, for example, to produce a compact made from alloy powder.
  • the Mg-containing treatment agent in the form of a cored wire is used in the method of the invention, the treatment powder being enclosed in a metal jacket.
  • the casing material is generally steel; sheaths of the core filling made of nickel and nickel alloys can also be used.
  • a cladding material made of nickel alloys is used in the method according to the invention if e.g. an austenitic cast iron with nodular graphite is to be produced.
  • the advantages of the process of the invention are to be seen in the fact that, in particular in connection with a casting furnace, the amount of treatment agent containing Mg can be varied within wide limits without the composition of the cast iron, except in the Mg content or in the Mg content and changes SE metals significantly.
  • base irons of different analysis were melted in a mains frequency induction furnace and then treated in a treatment vessel known per se with a treatment agent containing magnesium or magnesium and rare earth metals at temperatures between 1460 and 1500 ° C.
  • the treatment agent consisted of a cored wire with an outside diameter between 5 and 6.5 mm.
  • the steel jacket enveloping the treatment powder had a thickness of 0.35 mm.
  • the chemical composition and the type and amount of graphite formation were determined on samples of the treated iron. example Base iron NFI furnace in% Mg treatment wire Treatment amount in kg Iron temperature in ° C Adding Mg container wire in% Chemical addition of iron in% Graphite formation in% Mg output in% Wire ⁇ in mm Chemical additives.

Landscapes

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

Abstract

In a process for the production of cast iron with spheroidal graphite and/or vermicular graphite, by treating the molten cast iron with a treatment agent containing magnesium, according to the invention a treatment agent containing magnesium or magnesium and rare-earth metals is used, the composition of which is formed with the proviso that the components, with the exception of magnesium or the magnesium and the rare-earth metals, are contained therein in the ratio (in % by weight) which corresponds to the ratio (in % by weight) of the alloying components in the cast iron alloy to be treated.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Gußeisen mit Kugelgraphit und/oder Vermiculargraphit durch Behandeln der Gußeisenschmelze mit einem Magnesium oder Magnesium und Seltene Erdmetalle enthaltenden Behandlungsmittel.The invention relates to a process for producing cast iron with spheroidal graphite and / or vermicular graphite by treating the molten cast iron with a treatment agent containing magnesium or magnesium and rare earth metals.

Zur Herstellung von Gußeisen mit Kugelgraphit ist es bekannt, die Gußeisenschmelze mit die Kugelgraphitbildung induzierenden Elementen zu behandeln, wie Alkali- oder Erdalkalimetalle, Magnesium oder Metalle der Seltenen Erden. Die beiden letzteren werden in der technischen Praxis bevorzugt. Magnesium kann in reiner metallischer Form eingesetzt werden, wobei man sich geeigneter Vorrichtungen bedient, die der hohen Reaktivität des Metalls bei der Schmelzbehandlung in sicherer Weise Rechnung tragen. Eine vereinfachte Handhabung bieten magnesiumhaltige Vorlegierungen, die z.B. als schmelzgegossene Formkörper oder als gepreßte Pulverkörper bzw. Briketts üblicherweise im Tauchverfahren oder Übergießverfahren eingesetzt werden. Magnesiumhaltige Behandlungsmittel sind auch als sogenannte Fülldrähte bekannt, wobei die pulverförmige Legierung als gepreßter Kerndraht von einem hochschmelzenden Metallmantel, wie Stahlmantel umschlossen ist (DE-AS 26 03 412).To produce spheroidal graphite cast iron, it is known to treat the molten cast iron with spheroidal graphite-inducing elements such as alkali or alkaline earth metals, magnesium or rare earth metals. The latter two are preferred in technical practice. Magnesium can be used in a pure metallic form, using suitable devices that safely take into account the high reactivity of the metal during the melt treatment. Magnesium-containing master alloys, which are used, for example, as melt-cast moldings or as pressed powder bodies or briquettes, are usually simplified in the immersion process or by pouring. Magnesium-containing treatment agents are also known as so-called cored wires, the powdered alloy being a pressed core wire and surrounded by a high-melting metal sheath, such as a steel sheath (DE-AS 26 03 412).

Legierungskomponenten des Magnesiums oder der Metalle der Seltenen Erden sind in den überwiegenden Fällen Calcium, Aluminium, Silicium, Nickel und Eisen. Übliche Legierungen haben beispielsweise die Zusammensetzung 5,5 bis 6,5 % Mg, 1,5 bis 2,5 % Ca, 0,5 bis 1,5 % Al, 45 bis 50 % Si, Rest Fe.Alloy components of magnesium or rare earth metals are predominantly calcium, aluminum, silicon, nickel and iron. Typical alloys have, for example, the composition 5.5 to 6.5% Mg, 1.5 to 2.5% Ca, 0.5 to 1.5% Al, 45 to 50% Si, balance Fe.

Es ist ersichtlich, daß in einer Gußeisenschmelze, die für den erstrebten Zweck nur einmal mit einer Mg-Vorlegierung behandelt wird, der Einfluß der anderen, nicht induzierend wirkenden Legierungskomponenten, wie Silicium und Aluminium, auf die Basiseisenschmelze, nicht vernachlässigt werden kann; dies ist beispielsweise der Fall bei der Behandlung der Gußeisenschmelze mit Mg-haltigen Vorlegierungen auf Basis von z.B. Ferrosilicium in der Behandlungspfanne oder bei der Behandlung in der Gießform.It can be seen that in a cast iron melt which is treated only once with a Mg master alloy for the intended purpose, the influence of the other non-inductive alloy components, such as silicon and aluminum, on the base iron melt cannot be neglected; this is the case, for example, when treating the cast iron melt with Mg-containing master alloys based on e.g. Ferrosilicon in the treatment pan or in the treatment in the casting mold.

Hingegen erfordern Verfahrensweisen in sogenannten Vergießöfen in aller Regel besondere Aufmerksamkeit. In Abhängigkeit von den örtlichen Gegebenheiten solcher Vergießöfen, wie Bauweise, Alter, unterschiedlichste Fertigungsprogramme, z.B. Kugelgraphiteisen, Vermiculargraphiteisen, nickellegiertes Gußeisen usw., läßt sich der gewünschte Restmagnesiumgehalt der behandelten Schmelze in den überwiegenden Fällen nur in einer sogenannten Über- oder Unterbehandlung oder in einer Mehrfachbehandlung der Basisschmelzen mit einem Magnesiumträger einstellen. Ersichtlich wird durch eine z.B. Überbehandlung mit üblichen magnesiumhaltigen Vorlegierungen aber auch die Zusammensetzung des Basiseisens in meist unerwünschter Weise verändert, beispielsweise Veränderung des Gehaltes an z.B. Si, C, Al, Mn.On the other hand, procedures in so-called potting ovens generally require special attention. Depending on the local conditions of such casting furnaces, such as construction, age, various manufacturing programs, e.g. spheroidal graphite iron, vermicular graphite iron, nickel-alloyed cast iron, etc., the desired residual magnesium content of the treated melt can in most cases only be so-called over or under treatment or in one Set multiple treatments of the base melts with a magnesium carrier. Obviously, the over-treatment with conventional magnesium-containing master alloys, for example, also changes the composition of the base iron in an undesirable manner, for example changing the content of, for example, Si, C, Al, Mn.

Eine unerwünschte Änderung der Analyse des Basiseisens bei der Magnesiumbehandlung von Eisenschmelzen läßt sich im Prinzip dadurch vermeiden, daß die Mg-Behandlung z.B. mit einem Produkt vorgenommen wird, das aus Reinmagnesium besteht. Ein solches Produkt ist unter den Bedingungen der Eisenschmelzen hochreaktiv und nur mit hohem technischen und apparativen Aufwand einzusetzen und daher wenig wirtschaftlich Außerdem läßt sich mit Reinmagnesium der angestrebte sogenannte Restmagnesium-Gehalt erfahrungsgemäß in der technischen Praxis nicht hinreichend genau und reproduzierbar einstellen.An undesirable change in the analysis of the base iron in the magnesium treatment of molten iron can in principle be avoided by the Mg treatment e.g. with a product made of pure magnesium. Such a product is highly reactive under the conditions of molten iron and can only be used with a high level of technical and apparatus expenditure and is therefore not very economical. Experience has shown that the desired residual magnesium content cannot be set sufficiently accurately and reproducibly in technical practice with pure magnesium.

Der Erfindung liegt die Aufgabe zugrunde ein Behandlungsverfahren für Gußeisenschmelzen unter Verwendung eines magnesiumhaltigen Behandlungsmittels anzugeben, bei dem die Basisschmelze auch bei überhöhter Zugabe des Mittels keine nennenswerte Abweichung von ihrer Richtanalyse erfährt.The invention has for its object to provide a treatment method for cast iron melts using a magnesium-containing treatment agent, in which the base melt does not experience any significant deviation from its directional analysis even when the agent is added excessively.

Die Erfindung löst die Aufgabe, ausgehend von einem Verfahren zur Herstellung von Gußeisen mit Kugelgraphit und/oder mit Vermiculargraphit durch Behandeln der Gußeisenschmelze mit einem magnesiumhaltigen Behandlungsmittel. Bei einem Verfahren der genannten Art besteht lösungsgemäß die Erfindung darin, daß ein Magnesium oder Magnesium und Seltene Erdmetalle enthaltendes Behandlungsmittel eingesetzt wird, dessen Zusammensetzung mit der Maßgabe erfolgt, daß die Komponenten, ausgenommen das Magnesium bzw. das Magnesium und die Seltenen Erdmetalle, in dem Verhältnis (in Gew.-%) darin enthalten sind, welches dem Verhältnis (in Gew.-%) der Legierungskomponenten in der zu behandelnden Gußeisenlegierung entspricht.The invention solves the problem, starting from a method for producing cast iron with spheroidal graphite and / or with vermicular graphite by treating the molten cast iron with a magnesium-containing treatment agent. In a method of the type mentioned, the invention consists in that a treatment agent containing magnesium or magnesium and rare earth metals is used, the composition of which is carried out with the proviso that the components, with the exception of the magnesium or the magnesium and the rare earth metals, in the ratio (in% by weight) contained therein, which corresponds to the ratio (in% by weight) of the alloy components in the cast iron alloy to be treated.

In dem Verfahren der Erfindung werden als geeignete magnesiumhaltige Behandlungsmittel solche der Zusammensetzung eingesetzt: 1,00 bis 45,00 Gew.-% Magnesium 3,00 bis 5,00 " Kohlenstoff 1,50 bis 6,00 " Silicium 0,10 bis 0,60 " Mangan max. 0,05 " Phosphor max. 0,01 " Schwefel 0 bis 5,00 " Seltene Erdmetalle 0 bis 0,20 " Titan 0 bis 6,00 " Chrom 0 bis 1,00 " Kupfer 0 bis 40,00 " Nickel Rest Eisen Suitable magnesium-containing treatment agents in the process of the invention are those of the composition: 1.00 to 45.00 % By weight magnesium 3.00 to 5.00 " carbon 1.50 to 6.00 " Silicon 0.10 to 0.60 " manganese Max. 0.05 " phosphorus Max. 0.01 " sulfur 0 to 5.00 " Rare earth metals 0 to 0.20 " titanium 0 to 6.00 " chrome 0 to 1.00 " copper 0 to 40.00 " nickel rest iron

Das im Verfahren der Erfindung eingesetzte magnesiumhaltige Behandlungsmittel muß als wesentliche Komponenten insbesondere Kohlenstoff, Silicium und Mangan enthalten.The magnesium-containing treatment agent used in the process of the invention must contain, in particular, carbon, silicon and manganese as essential components.

Zur Behandlung gemäß dem Verfahren der Erfindung geeignete Gußeisenschmelzen sind beispeilsweise solche zur Herstellung von Gußeisen mit Kugelgraphit der Analyse: 3,7 Gew.-% C
2,5   "    Si
0,25  "    Mn
0,008 "    S
0,020 "    P
0,040 "    Mg
0,02 "    Ti
Rest       Fe
oder Gußeisenschmelzen zur Herstellung von Gußeisen mit Vermiculargraphit der Analyse:

3,6 Gew.-% C
2,6   "    Si
0,20  "    Mn
0,010 "    S
0,020 "    P
0,025 "    Mg
0,16  "    Ti
Rest       Fe

oder Gußeisenschmelzen zur Herstellung von legiertem Gußeisen mit Kugelgraphit der Analyse:

 2,6    Gew.-% C
 4,5       "   Si
 0,60      "   Mn
30,0       "   Ni
 2,0       "   Cr
 0,050     "   Mg
Rest           Fe
Cast iron melts suitable for treatment according to the method of the invention are, for example, those for the production of spheroidal graphite cast iron of the analysis: 3.7 wt% C
2.5 "Si
0.25 "Mn
0.008 "S
0.020 "P
0.040 "Mg
0.02 "Ti
Rest of Fe
or cast iron smelting for the production of cast iron with vermicular graphite of the analysis:

3.6 wt% C
2.6 "Si
0.20 "Mn
0.010 "S
0.020 "P
0.025 "Mg
0.16 "Ti
Rest of Fe

or cast iron smelting for the production of alloyed cast iron with spheroidal graphite Analysis:

2.6 wt% C
4.5 "Si
0.60 "Mn
30.0 "Ni
2.0 "Cr
0.050 "Mg
Rest of Fe

Die Herstellung des im Verfahren der Erfindung verwendeten Mg-haltigen Behandlungsmittels erfolgt nach an sich bekannten Methoden. Beispielsweise werden die einzelnen Komponenten in Pulverform gebracht und die verschiedenen Pulver zur gewünschten Zusammensetzung vermischt, wie Pulver aus Graphit, Magnesium, FeSiMg, Eisenpulver zu einem Behandlungsmittel, beispielsweise der Zusammensetzung: 3,6 Gew.-% C, 2,2 Gew.-% Si, 0,11 Gew.-% Mn, 16,0 Gew.-% Mg, 0,1 Gew.-% Cu, Rest Fe.The Mg-containing treatment agent used in the process of the invention is produced by methods known per se. For example, the individual components are brought into powder form and the various powders are mixed to the desired composition, such as powder made of graphite, magnesium, FeSiMg, iron powder to form a treatment agent, for example the composition: 3.6% by weight C, 2.2% by weight. % Si, 0.11% by weight Mn, 16.0% by weight Mg, 0.1% by weight Cu, balance Fe.

Das erhaltene Behandlungsmittel der angegebenen Zusammensetzung kann dann beispielsweise zur Herstellung eines Preßkörpers aus Legierungspulver verwendet werden.The treatment agent obtained with the specified composition can then be used, for example, to produce a compact made from alloy powder.

Insbesondere wird in dem Verfahren der Erfindung das Mg-haltige Behandlungsmittel in Form eines Fülldrahtes verwendet, wobei das Behandlungspulver von einem Metallmantel umschlossen ist. Der Mantelwerkstoff ist im allgemeinen Stahl; es können aber auch Ummantelungen der Kernfüllung aus Nickel und Nickellegierungen verwendet werden. Ein Mantelwerkstoff aus Nickellegierungen wird im erfindungsgemäßen Verfahren dann verwendet, wenn z.B. ein austenitisches Gußeisen mit Kugelgraphit hergestellt werden soll.In particular, the Mg-containing treatment agent in the form of a cored wire is used in the method of the invention, the treatment powder being enclosed in a metal jacket. The casing material is generally steel; sheaths of the core filling made of nickel and nickel alloys can also be used. A cladding material made of nickel alloys is used in the method according to the invention if e.g. an austenitic cast iron with nodular graphite is to be produced.

Die Vorteile des Verfahrens der Erfindung sind darin zu sehen, daß insbesondere im Zusammenhang mit einem Vergießofen die Zugabemenge des Mg-haltigen Behandlungsmittels in weiten Grenzen variiert werden kann, ohne daß sich die Zusammensetzung des Gußeisens, außer im Mg-Gehalt oder im Gehalt an Mg und SE-Metallen nennenswert ändert.The advantages of the process of the invention are to be seen in the fact that, in particular in connection with a casting furnace, the amount of treatment agent containing Mg can be varied within wide limits without the composition of the cast iron, except in the Mg content or in the Mg content and changes SE metals significantly.

Die Erfindung wird anhand der nachstehenden Beispiele näher und beispielhaft erläutert.The invention is explained in more detail and by way of example using the examples below.

In den nachfolgenden in der Tabelle aufgeführten Beispielen wurden Basiseisen unterschiedlicher Analyse in einem Netzfrequenz-Induktionsofen erschmolzen und anschließend in einem an sich bekannten Behandlungsgefäß mit einem Magnesium bzw. Magnesium und Seltene Erdmetalle enthaltenden Behandlungsmittel bei Temperaturen zwischen 1460 und 1500°C behandelt. Das Behandlungsmittel bestand aus einem Fülldraht mit einem Außendurchmesser zwischen 5 und 6,5 mm. Der das Behandlungspulver einhüllende Stahlmantel hatte eine Dicke von 0,35 mm. An Proben des behandelten Eisens wurden die chemische Zusammensetzung sowie an Schliffbildern Art und Menge der Graphitausbildung ermittelt. Beispiel Basiseisen NFI-Ofen in % Mg-Behandlungsdraht Behandlungsmenge in kg Eisentemperatur in °C Zugabe Mg-Beh.-draht in % Chemische Zus.setzung d.beh.Eisens in % Graphitausbildung in % Mg-Ausbringen in % Draht-⌀ in mm Chemische Zus.setz. in % 1 C 3,600 5,0 C 3,600 1.000 1.470 0,85 C 3,600 95 Kugeln ca. 35 Si 2,200 Si 2,200 Si 2,200 Mn 0,110 Mn 0,110 Mn 0,120 P 0,025 P 0,004 P 0,025 S 0,011 S 0,005 S 0,009 Fe Rest Mg 16,000 Mg 0,048 Fe Rest Fe Rest 2 C 3,700 5,0 C 3,600 600 1.490 1,0 C 3,600 > 90 Kugeln ca. 31 Si 2,300 Si 2,200 Si 2,300 Mn 0,160 Mn 0,110 Mn 0,150 P 0,031 P 0,004 P 0,030 S 0,020 S 0,005 S 0,016 Fe Rest Mg 16,000 Mg 0,050 Fe Rest Fe Rest 3 C 3,900 6,5 C 4,000 1.500 1.470 0,35 C 3,870 70 vermicular ca. 40 Si 2,600 Si 2,600 Si 2,650 Mn 0,240 Mn 0,110 Mn 0,220 P 0,026 P 0,004 P 0,025 S 0,010 S 0,005 S 0,005 30 Kugeln Ti 0,150 Mg 16,000 Mg 0,021 Fe Rest Ti 0,150 Ti 0,150 Fe Rest Fe Rest 4 C 3,900 5,0 C 3,900 900 1.460 0,35 C 3,850 75 vermicular ca. 38 Si 2,600 Si 2,800 Si 2,650 Mn 0,240 Mn 0,100 Mn 0,230 P 0,026 P 0,004 P 0,025 S 0,010 S 0,005 S 0,009 25 Kugeln Ti 0,150 Mg 17,500 Mg 0,023 Fe Rest Ti 0,150 Ti 0,150 CerMM 3,5 CerMM 0,006 Fe Rest Rest Rest 5 C 3,600 6,5 C 4,000 800 1.500 3,40 C 3,720 > 90 Kugeln ca. 25 Si 1,700 Si 1,900 Si 1,760 Mn 0,750 Mn 0,650 Mn 0,730 P 0,030 P 0,004 P 0,030 S 0,045 S 0,005 S 0,040 Cr 3,250 Mg 17,500 Mg 0,150 Ni 17,500 Ni 20,000 Ni 17,600 Fe Rest Cr 3,000 Cr 3,100 Fe Rest Fe Rest In the following examples listed in the table, base irons of different analysis were melted in a mains frequency induction furnace and then treated in a treatment vessel known per se with a treatment agent containing magnesium or magnesium and rare earth metals at temperatures between 1460 and 1500 ° C. The treatment agent consisted of a cored wire with an outside diameter between 5 and 6.5 mm. The steel jacket enveloping the treatment powder had a thickness of 0.35 mm. The chemical composition and the type and amount of graphite formation were determined on samples of the treated iron. example Base iron NFI furnace in% Mg treatment wire Treatment amount in kg Iron temperature in ° C Adding Mg container wire in% Chemical addition of iron in% Graphite formation in% Mg output in% Wire ⌀ in mm Chemical additives. in % 1 C. 3,600 5.0 C. 3,600 1,000 1,470 0.85 C. 3,600 95 bullets about 35 Si 2,200 Si 2,200 Si 2,200 Mn 0.110 Mn 0.110 Mn 0.120 P 0.025 P 0.004 P 0.025 S 0.011 S 0.005 S 0.009 Fe rest Mg 16,000 Mg 0.048 Fe rest Fe rest 2nd C. 3,700 5.0 C. 3,600 600 1,490 1.0 C. 3,600 > 90 balls approx. 31 Si 2,300 Si 2,200 Si 2,300 Mn 0.160 Mn 0.110 Mn 0.150 P 0.031 P 0.004 P 0.030 S 0.020 S 0.005 S 0.016 Fe rest Mg 16,000 Mg 0.050 Fe rest Fe rest 3rd C. 3,900 6.5 C. 4,000 1,500 1,470 0.35 C. 3,870 70 vermicular about 40 Si 2,600 Si 2,600 Si 2,650 Mn 0.240 Mn 0.110 Mn 0.220 P 0.026 P 0.004 P 0.025 S 0.010 S 0.005 S 0.005 30 balls Ti 0.150 Mg 16,000 Mg 0.021 Fe rest Ti 0.150 Ti 0.150 Fe rest Fe rest 4th C. 3,900 5.0 C. 3,900 900 1,460 0.35 C. 3,850 75 vermicular approx. 38 Si 2,600 Si 2,800 Si 2,650 Mn 0.240 Mn 0.100 Mn 0.230 P 0.026 P 0.004 P 0.025 S 0.010 S 0.005 S 0.009 25 balls Ti 0.150 Mg 17,500 Mg 0.023 Fe rest Ti 0.150 Ti 0.150 CerMM 3.5 CerMM 0.006 Fe rest rest rest 5 C. 3,600 6.5 C. 4,000 800 1,500 3.40 C. 3,720 > 90 balls approx. 25 Si 1,700 Si 1,900 Si 1,760 Mn 0.750 Mn 0.650 Mn 0.730 P 0.030 P 0.004 P 0.030 S 0.045 S 0.005 S 0.040 Cr 3,250 Mg 17,500 Mg 0.150 Ni 17,500 Ni 20,000 Ni 17,600 Fe rest Cr 3,000 Cr 3,100 Fe rest Fe rest

Claims (5)

1. Verfahren zur Herstellung von Gußeisen mit Kugelgraphit und/oder Vermiculargraphit, durch Behandeln der Gußeisenschmelze mit einem Magnesium enthaltenden Behandlungsmittel, dadurch gekennzeichnet, daß ein Magnesium oder Magnesium und Seltene Erdmetalle enthaltendes Behandlungsmittel eingesetzt wird, dessen Zusammensetzung mit der Maßgabe erfolgt, daß die Komponenten, ausgenommen das Magnesium bzw. das Magnesium und die Seltenen Erdmetalle, in dem Verhältnis (in Gew.-%) darin enthalten sind, welches dem Verhältnis (in Gew.-%) der Legierungskomponenten in der zu behandelnden Gußeisenlegierung entspricht.1. A process for the production of cast iron with spheroidal graphite and / or vermicular graphite, by treating the cast iron melt with a treatment agent containing magnesium, characterized in that a treatment agent containing magnesium or magnesium and rare earth metals is used, the composition of which is carried out with the proviso that the components , with the exception of the magnesium or the magnesium and the rare earth metals, contained in the ratio (in% by weight) which corresponds to the ratio (in% by weight) of the alloy components in the cast iron alloy to be treated. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Behandlungsmittel verwendet wird der Zusammensetzung:
1,00 bis 45,00 Gew.-% Magnesium
3,00 bis  5,00    "   Kohlenstoff
1,50 bis  6,00    "   Silicium
0,10 bis  0,60    "   Mangan
     max. 0,05    "   Phosphor
     max. 0,01    "   Schwefel
   0 bis  5,00    "   Seltene Erdmetalle
   0 bis  0,20    "   Titan
   0 bis  6,00    "   Chrom
   0 bis  1,00    "   Kupfer
   0 bis 40,00    "   Nickel
   Rest               Eisen
2. The method according to claim 1, characterized in that a treatment agent is used the composition:
1.00 to 45.00% by weight of magnesium
3.00 to 5.00 "carbon
1.50 to 6.00 "silicon
0.10 to 0.60 "manganese
Max. 0.05 "phosphorus
Max. 0.01 "sulfur
0 to 5.00 "Rare Earth Metals
0 to 0.20 "titanium
0 to 6.00 "chrome
0 to 1.00 "copper
0 to 40.00 "nickel
Rest of iron
3. Verfahren nach den Ansprüchen 1 bis 2, dadurch gekennzeichnet, daß das Behandlungsmittel als gepreßter Pulverkörper Formkörper verwendet wird.3. Process according to claims 1 to 2, characterized in that the treatment agent is used as a pressed powder body molding. 4. Verfahren nach den Ansprüchen 1 bis 2, dadurch gekennzeichnet, daß das Behandlungsmittel in Form eines Drahtes verwendet wird, wobei ein Pulvergemisch als Kern von einem Metallmantel umschlossen ist.4. Process according to claims 1 to 2, characterized in that the treatment agent is used in the form of a wire, a powder mixture being enclosed as a core by a metal jacket. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Mantelwerkstoff Stahl oder Nickel und Nickellegierungen ist.5. The method according to claim 4, characterized in that the jacket material is steel or nickel and nickel alloys.
EP89201831A 1988-07-16 1989-07-11 Process for the production of cast iron with spheroidal graphite and/or vermicular graphite Expired - Lifetime EP0353804B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824175 1988-07-16
DE3824175A DE3824175A1 (en) 1988-07-16 1988-07-16 METHOD FOR PRODUCING CAST IRON WITH SPHERICAL GRAPHITE AND / OR VERMICULAR GRAPHITE

Publications (2)

Publication Number Publication Date
EP0353804A1 true EP0353804A1 (en) 1990-02-07
EP0353804B1 EP0353804B1 (en) 1994-05-04

Family

ID=6358834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89201831A Expired - Lifetime EP0353804B1 (en) 1988-07-16 1989-07-11 Process for the production of cast iron with spheroidal graphite and/or vermicular graphite

Country Status (3)

Country Link
EP (1) EP0353804B1 (en)
DE (2) DE3824175A1 (en)
ES (1) ES2052885T3 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124159C1 (en) * 1991-07-20 1992-04-09 Skw Trostberg Ag, 8223 Trostberg, De
EP1458518A2 (en) * 2001-11-27 2004-09-22 Tupy Fundiçoes Ltda. Graphitic cast iron of high mechanical strength
EP1811051A1 (en) * 2004-11-04 2007-07-25 Dynin, Anton Yakovlevich Alloy for modifying iron
CN109023025A (en) * 2018-08-20 2018-12-18 江苏力源金河铸造有限公司 A kind of preparation method with high-elongation vermicular cast iron
CN113112514A (en) * 2021-04-27 2021-07-13 汇鸿智能科技(辽宁)有限公司 Method and device for AI (Artificial Intelligence) recognition of graphite size, computer equipment and storage medium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324494C2 (en) * 1993-07-21 1995-04-20 Sueddeutsche Kalkstickstoff Process for treating molten cast iron
BR102016022690B1 (en) 2016-09-29 2022-02-08 Tupy S.A. VERMICULAR CAST IRON ALLOY FOR INTERNAL COMBUSTION ENGINE BLOCK AND HEAD

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459541A (en) * 1966-09-22 1969-08-05 Gen Motors Corp Process for making nodular iron
DE1302000B (en) * 1968-03-21 1969-09-25 Elektrometallurgie Gmbh Briquette for introducing magnesium into metallic melts
DE2603412A1 (en) * 1975-07-25 1977-01-27 Hitachi Cable METHOD FOR PRODUCING A WIRE-SHAPED COMPOSITE ADDITIONAL MATERIAL
EP0030043A2 (en) * 1979-12-04 1981-06-10 Metallgesellschaft Ag Agent in wire form for treating molten metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459541A (en) * 1966-09-22 1969-08-05 Gen Motors Corp Process for making nodular iron
DE1302000B (en) * 1968-03-21 1969-09-25 Elektrometallurgie Gmbh Briquette for introducing magnesium into metallic melts
DE2603412A1 (en) * 1975-07-25 1977-01-27 Hitachi Cable METHOD FOR PRODUCING A WIRE-SHAPED COMPOSITE ADDITIONAL MATERIAL
EP0030043A2 (en) * 1979-12-04 1981-06-10 Metallgesellschaft Ag Agent in wire form for treating molten metals

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124159C1 (en) * 1991-07-20 1992-04-09 Skw Trostberg Ag, 8223 Trostberg, De
EP0524444A1 (en) * 1991-07-20 1993-01-27 SKW Trostberg Aktiengesellschaft Agent for treating of cast iron melts
EP1458518A2 (en) * 2001-11-27 2004-09-22 Tupy Fundiçoes Ltda. Graphitic cast iron of high mechanical strength
EP1458518A4 (en) * 2001-11-27 2004-12-15 Tupy Fundicoes Ltda Graphitic cast iron of high mechanical strength
EP1811051A1 (en) * 2004-11-04 2007-07-25 Dynin, Anton Yakovlevich Alloy for modifying iron
EP1811051A4 (en) * 2004-11-04 2008-01-23 Dynin Anton Yakovlevich Alloy for modifying iron
CN109023025A (en) * 2018-08-20 2018-12-18 江苏力源金河铸造有限公司 A kind of preparation method with high-elongation vermicular cast iron
CN113112514A (en) * 2021-04-27 2021-07-13 汇鸿智能科技(辽宁)有限公司 Method and device for AI (Artificial Intelligence) recognition of graphite size, computer equipment and storage medium
CN113112514B (en) * 2021-04-27 2024-05-17 汇鸿智能科技(辽宁)有限公司 Method, device, computer equipment and storage medium for identifying graphite size by AI

Also Published As

Publication number Publication date
DE58907597D1 (en) 1994-06-09
ES2052885T3 (en) 1994-07-16
EP0353804B1 (en) 1994-05-04
DE3824175A1 (en) 1990-01-18

Similar Documents

Publication Publication Date Title
DE2943601C2 (en) Pre-alloyed steel powder for the powder metallurgical production of high-strength parts
DE2738379A1 (en) PROCESS FOR REFINING METAL IRON AND STEEL
EP0325810A1 (en) Process for making spheroidal graphite cast iron
EP0353804A1 (en) Process for the production of cast iron with spheroidal graphite and/or vermicular graphite
EP0066305B1 (en) Additive in wire form for treating molten metals
DE2948636A1 (en) WIRE-SHAPED AGENT FOR TREATING METAL MELT
DE2723870C2 (en) Process for the manufacture of cast iron
EP0410360A1 (en) Agent for treating of castiron melts
EP0499269B1 (en) Cored wire for inoculation
DE2244092A1 (en) NICKEL-MAGNESIUM ALLOY
DE4124159C1 (en)
DE2757444C3 (en) Process for the production of synthetic cast iron
DE4033182C2 (en)
DE1458810C3 (en) Process for the production of an iron-silicon alloy with an oxygen content of about 0.0025%
DE2458033B2 (en) METHOD FOR PRODUCING A CAST IRON WITH VERMICULAR GRAPHITE
DE3932162C2 (en)
EP0484743A1 (en) Cored wire for the treatment of molten cast iron
DE69125860T2 (en) Nodularization process
DE1458811C2 (en) Process for the production of low carbon steels
DE856448C (en) Process for introducing alloying elements into molten metals, particularly iron and steel
DE2250165B2 (en) NODULATING COMPOSITION FOR USE IN THE MANUFACTURING OF CAST IRON WITH SPHERICAL GRAPHITE
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)
DE1508221C3 (en) Master alloy for the production of cast iron with spheroidal graphite
DE719121C (en) Process for the production of chromium-nickel and chromium-nickel-iron alloys
DE2140022B2 (en) PROCESS FOR MANUFACTURING PIPES FROM CAST IRON IN METALLIC CAST IRON CHILLES

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB

17P Request for examination filed

Effective date: 19900320

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SKW TROSTBERG AKTIENGESELLSCHAFT

17Q First examination report despatched

Effective date: 19910924

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940504

REF Corresponds to:

Ref document number: 58907597

Country of ref document: DE

Date of ref document: 19940609

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940517

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19940712

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2052885

Country of ref document: ES

Kind code of ref document: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940804

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950401

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940804

26N No opposition filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20010201