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EP3170578B1 - Process for the production of a cast piece from cast iron with spheroidal graphite - Google Patents

Process for the production of a cast piece from cast iron with spheroidal graphite Download PDF

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Publication number
EP3170578B1
EP3170578B1 EP15194848.6A EP15194848A EP3170578B1 EP 3170578 B1 EP3170578 B1 EP 3170578B1 EP 15194848 A EP15194848 A EP 15194848A EP 3170578 B1 EP3170578 B1 EP 3170578B1
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EP
European Patent Office
Prior art keywords
cast iron
spheroidal graphite
casting
cast
production
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EP15194848.6A
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German (de)
French (fr)
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EP3170578A1 (en
Inventor
Eric Thomas
Werner Menk
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GF Casting Solutions Kunshan Co Ltd
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GF Casting Solutions Kunshan Co Ltd
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Priority to EP15194848.6A priority Critical patent/EP3170578B1/en
Priority to US15/350,126 priority patent/US20170136537A1/en
Priority to CN201611011585.2A priority patent/CN106975740A/en
Publication of EP3170578A1 publication Critical patent/EP3170578A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/007—Treatment of the fused masses in the supply runners
    • 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
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon

Definitions

  • the invention relates to a method of manufacturing a casting by means of a modification body.
  • the modification body is used to produce cast iron with spheroidal graphite, in particular with a predominantly ferritic structure, containing a carrier material, preferably an iron-silicon alloy.
  • Cast iron generally contains between 2 to 4 percent by weight of carbon.
  • the carbon is intimately mixed with the iron and the shape that the carbon takes in the solidified cast iron defines the characteristics and properties of the cast iron pieces.
  • the carbon takes the form of graphite, the cast iron is rather soft and machinable.
  • Graphite can come in different forms. Cast iron with spheroidal graphite has a high strength, whereby the structure types must be taken into account. Cast iron with spheroidal graphite that has a purely ferritic structure and therefore does not contain any cementite is soft and easy to work with. Whereas cast iron with spheroidal graphite and a pearlitic structure has good wear properties due to its high strength. A pearlitic / ferritic structure in turn has a higher strength than a purely ferritic structure.
  • the undesirably high pearlite content in the cast part is supported by accelerated cooling.
  • the object of the invention is to propose a method for producing spheroidal graphite cast iron which, by reducing the pearlite structure in the cast iron or cast part, ensures lower hardness and higher elongation at break without making the cast iron or cast parts more expensive to manufacture.
  • a modification body which contains 7 to 16 percent by weight boron. Furthermore, at least one modification body according to the invention is inserted into the casting system, where it is flowed around by the cast iron or the melt, or at least one modification body according to the invention is added to the melt before casting and dissolved by it. As a result, a casting made of spheroidal graphite cast iron is produced which has a boron content of 0.002-0.008 percent by weight.
  • the pearlite-reducing effect of boron is known, but has so far been considered negative in the production of cast iron with spheroidal graphite, since microporosity and carbides can occur if the boron content is too high, which are serious if it exceeds 0.01 percent by weight and, if it is increased further, severe graphite degeneration occurs .
  • At least one modification body according to the invention which has a boron content of 7 to 16 percent by weight is provided inserted into the casting system of a casting after casting.
  • cast iron or melt flows around the modification body and continuously releases boron, which is absorbed by the cast iron.
  • at least one modification body is inserted into the casting system before casting.
  • several modification bodies can also be arranged in the casting system; this is to be selected according to the required boron content in the casting.
  • a cast part made of spheroidal graphite cast iron has a boron content of 0.002-0.008 percent by weight, which suppresses or reduces the formation of pearlite and the desired hardness and elongation at break properties are achieved.
  • At least one of the modification bodies is arranged between the sprue and filter before casting and the cast iron or melt flows around it during casting.
  • At least one modification body can also be added directly to the cast iron or the melt prior to casting.
  • the number and arrangement of the modification bodies is selected according to the required boron content in the casting or the desired hardness and elongation at break.
  • the cast piece according to the invention with spheroidal graphite produced by the method according to the invention preferably has a predominantly ferritic structure.
  • the method according to the invention and the use of the modification body according to the invention produce a cast piece made of spheroidal graphite which preferably does not exceed a Brinell hardness of 170 HB.
  • a Brinell hardness of 140-170 HB has proven to be advantageous.
  • the structure of the cast piece made of spheroidal graphite is preferably predominantly ferritic.
  • a melt of spheroidal graphite cast iron has an Mn content of 0.35% by weight due to contaminated steel scrap as input material and is therefore too high for the desired application, since according to the present analysis instructions a maximum Mn content of 0.25% by weight. -% is permissible.
  • the excessively high Mn content in the existing melt or cast iron resulted in a Brinell hardness of 190 HB instead of the maximum 170 HB, which is permissible according to the regulations.
  • FIG. 1 a schematic representation of a casting system with a modification body according to the invention.
  • Fig. 1 shows a schematic view of a casting system 1 wherein the modification body 6 according to the invention is arranged in front of the filter 3, which is a possible arrangement of the modification body 6 shows.
  • the melt of cast iron with spheroidal graphite is introduced into the casting system 1 via the sprue 2.
  • the melt flows around the modification body 6 and absorbs the desired amount of boron from it.
  • the melt then flows through the filter 3 in order to filter out unwanted impurities.
  • the melt in the subsequent feeder 4 is used to continuously replenish the melt in the casting 5 during cooling.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (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)

Description

Die Erfindung betrifft ein Herstellungsverfahren eines Gussstücks mittels eines Modifikationskörpers.The invention relates to a method of manufacturing a casting by means of a modification body.

Der Modifikationskörper dient der Herstellung von Gusseisen mit Kugelgraphit insbesondere mit mehrheitlich ferritischem Gefüge beinhaltend ein Trägermaterial vorzugsweise eine Eisen-Silizium-Legierung.The modification body is used to produce cast iron with spheroidal graphite, in particular with a predominantly ferritic structure, containing a carrier material, preferably an iron-silicon alloy.

Gusseisen enthält im Allgemeinen zwischen 2 bis 4 Gewichtsprozent Kohlenstoff. Der Kohlenstoff ist innig mit dem Eisen vermischt und die Form die der Kohlenstoff im verfestigten Gusseisen annimmt definiert die Merkmale und Eigenschaften der Gusseisenstücke. Wenn der Kohlenstoff die Form von Graphit annimmt ist das Gusseisen eher weich und maschinell verarbeitbar.Cast iron generally contains between 2 to 4 percent by weight of carbon. The carbon is intimately mixed with the iron and the shape that the carbon takes in the solidified cast iron defines the characteristics and properties of the cast iron pieces. When the carbon takes the form of graphite, the cast iron is rather soft and machinable.

Graphit kann in verschiedenen Formen auftreten. Gusseisen mit Kugelgraphit weist eine hohe Festigkeit auf, wobei dabei die Gefügearten zu berücksichtigen sind. Gusseisen mit Kugelgraphit das ein rein ferritisches Gefüge aufweist und somit keinen Zementit enthält ist weich und gut bearbeitbar. Wohingegen Gusseisen mit Kugelgraphit und einem perlitischen Gefüge durch die hohe Festigkeit gute Verschleisseigenschaften aufweist. Ein perlitisch/ferritisches Gefüge weist wiederum eine höhere Festigkeit als ein rein ferritisches Gefüge auf.Graphite can come in different forms. Cast iron with spheroidal graphite has a high strength, whereby the structure types must be taken into account. Cast iron with spheroidal graphite that has a purely ferritic structure and therefore does not contain any cementite is soft and easy to work with. Whereas cast iron with spheroidal graphite and a pearlitic structure has good wear properties due to its high strength. A pearlitic / ferritic structure in turn has a higher strength than a purely ferritic structure.

Bei der Herstellung von Gusseisen wird Stahlschrott wie auch Kreislaufmaterial als Einsatzmaterial verwendet. Da in solchem Einsatzmaterial meist ein hoher Mn und Cu Gehalt vorliegt entsteht ein unerwünscht hoher Perlitgehalt im Gusseisen bzw. im Gussteil.In the manufacture of cast iron, scrap steel and recycled material are used as input material. Since such an input material usually has a high Mn and Cu content, an undesirably high pearlite content arises in the cast iron or in the cast part.

Des Weiteren wird der unerwünscht hohe Perlitgehalt im Gussteil durch ein beschleunigtes Abkühlen unterstützt.Furthermore, the undesirably high pearlite content in the cast part is supported by accelerated cooling.

Um die unerwünscht hohe Perlitbildung zu reduzieren bzw. unterdrücken wurde bisher hochreiner Stahlschrott und / oder hochwertiges Roheisen in die Gusslegierung zugegeben, welche wenig Mn und Cu enthalten. Solche Stahlschrotte und Roheisen sind nur begrenzt am Markt verfügbar und deshalb teuer in der Beschaffung. Wenn die zu hohen Mn- und/oder Cu-Gehalte erst nach dem Schmelzen erkannt werden, kann dies höchstens noch durch Verdünnung der Schmelze mit einer Schmelze mit niedrigerem Mn- und/oder Cu-Gehalt korrigiert werden. Dies ist aber ein teurer Vorgang und in den meisten Fällen kaum realisierbar so dass die produzierten Teile durch ihren zu hohen Perlitgehalt eine zu hohe Festigkeit aufweisen und für den vorgesehenen Einsatz nicht brauchbar sind und verschrottet werden müssen.In order to reduce or suppress the undesirably high formation of pearlite, high-purity steel scrap and / or high-quality pig iron, which contain little Mn and Cu, have been added to the cast alloy up to now. Such steel scrap and pig iron are only available to a limited extent on the market and are therefore expensive Procurement. If the excessively high Mn and / or Cu contents are only recognized after melting, this can only be corrected by diluting the melt with a melt with a lower Mn and / or Cu content. However, this is an expensive process and in most cases hardly feasible so that the parts produced have too high a strength due to their excessive pearlite content and are not usable for the intended use and have to be scrapped.

Aus dem Stand der Technik sind die WO 2006/068487 A1 , US 2 280 284 A und ES 2 342 758 A1 bekannt, die die Zugabe von Bor zu Schmelzen zur Herstellung von Gusseisen offenbaren. DE2425122 offenbart die Zugabe eines Impfmittels in das Gießsystem einer Gusseisenform.From the prior art are those WO 2006/068487 A1 , U.S. 2,280,284 A and ES 2 342 758 A1 known, which disclose the addition of boron to melts for the production of cast iron. DE2425122 discloses the addition of an inoculant to the casting system of a cast iron mold.

Es ist Aufgabe der Erfindung ein Verfahren zur Herstellung von Gusseisen mit Kugelgraphit vorzuschlagen, das durch die Reduzierung des Perlitgefüges im Gusseisen bzw. Gussteil eine geringere Härte und eine höhere Bruchdehnung gewährleistet, ohne das Gusseisen bzw. die Gussteile in der Herstellung zu verteuern.The object of the invention is to propose a method for producing spheroidal graphite cast iron which, by reducing the pearlite structure in the cast iron or cast part, ensures lower hardness and higher elongation at break without making the cast iron or cast parts more expensive to manufacture.

Diese Aufgabe wird durch einen Modifikationskörper, der 7 bis 16 Gewichtsprozent Bor enthält, gelöst. Des Weiteren wird mindestens ein erfindungsgemässer Modifikationskörper in das Giesssystem eingelegt, wo er vom Gusseisen bzw. der Schmelze umströmt wird, oder der Schmelze wird vor dem Abguss mindestens ein erfindungsgemässer Modifikationskörper zugegeben und von dieser aufgelöst. Dadurch wird ein Gussstück aus Gusseisen mit Kugelgraphit hergestellt, das einen Borgehalt von 0.002-0.008 Gewichtsprozenten aufweist.This object is achieved by a modification body which contains 7 to 16 percent by weight boron. Furthermore, at least one modification body according to the invention is inserted into the casting system, where it is flowed around by the cast iron or the melt, or at least one modification body according to the invention is added to the melt before casting and dissolved by it. As a result, a casting made of spheroidal graphite cast iron is produced which has a boron content of 0.002-0.008 percent by weight.

Der perlitgehaltreduzierende Einfluss von Bor ist bekannt, allerdings bisher in der Herstellung von Gusseisen mit Kugelgraphit als negativ erachtet, da bei einem zu hohen Borgehalt Mikroporosität und Karbide auftreten können, die bei einer Überschreitung von 0.01 Gewichtsprozenten gravierend sind und bei weiterer Erhöhung zudem starke Graphitentartungen auftreten.The pearlite-reducing effect of boron is known, but has so far been considered negative in the production of cast iron with spheroidal graphite, since microporosity and carbides can occur if the boron content is too high, which are serious if it exceeds 0.01 percent by weight and, if it is increased further, severe graphite degeneration occurs .

Um den Perlitgehalt im Gusseisen zu reduzieren und dadurch die Bruchdehnung zu erhöhen und die Härte zu reduzieren wird mindestens ein erfindungsgemässer Modifikationskörper der einen Borgehalt von 7 bis 16 Gewichtsprozente aufweist vor dem Giessen in das Giesssystem eines Gussstücks eingelegt. Während des Formfüllvorgangs wird der Modifikationskörper vom Gusseisen bzw. der Schmelze umströmt und gibt kontinuierlich Bor ab, welches vom Gusseisen aufgenommen wird. Dazu wird mindestens ein Modifikationskörper vor dem Giessen in das Giesssystem eingesetzt. Selbstverständlich können auch mehrere Modifikationskörper im Giesssystem angeordnet werden, dies ist entsprechend dem benötigten Borgehalt im Gussstück zu wählen.In order to reduce the pearlite content in the cast iron and thereby increase the elongation at break and reduce the hardness, at least one modification body according to the invention which has a boron content of 7 to 16 percent by weight is provided inserted into the casting system of a casting after casting. During the During the mold filling process, cast iron or melt flows around the modification body and continuously releases boron, which is absorbed by the cast iron. For this purpose, at least one modification body is inserted into the casting system before casting. Of course, several modification bodies can also be arranged in the casting system; this is to be selected according to the required boron content in the casting.

Ein Gussteil aus Gusseisen mit Kugelgraphit weist einen Borgehalt von 0.002-0.008 Gewichtsprozenten auf, wodurch die Perlitbildung unterdrückt bzw. reduziert wird und die gewünschte Härte wie Bruchdehnungseigenschaften erreicht werden.A cast part made of spheroidal graphite cast iron has a boron content of 0.002-0.008 percent by weight, which suppresses or reduces the formation of pearlite and the desired hardness and elongation at break properties are achieved.

Es hat sich als vorteilhaft erwiesen, dass mindestens einer der Modifikationskörper vor dem Giessen zwischen Einguss und Filter angeordnet wird und während des Giessens vom Gusseisen bzw. der Schmelze umströmt wird.It has been found to be advantageous that at least one of the modification bodies is arranged between the sprue and filter before casting and the cast iron or melt flows around it during casting.

Vorzugsweise kann auch mindestens ein Modifikationskörper vordem Giessen direkt in das Gusseisen bzw. die Schmelze gegeben werden.Preferably, at least one modification body can also be added directly to the cast iron or the melt prior to casting.

Die Anzahl und Anordnung der Modifikationskörper wird entsprechend dem benötigten Borgehalt im Gussstück bzw. der gewünschten Härte und Bruchdehnung gewählt.The number and arrangement of the modification bodies is selected according to the required boron content in the casting or the desired hardness and elongation at break.

Das erfindungsgemässe Gussstück mit Kugelgraphit, hergestellt durch das erfindungsgemässe Verfahren, weist vorzugsweise ein mehrheitlich ferritisches Gefüge auf.The cast piece according to the invention with spheroidal graphite produced by the method according to the invention preferably has a predominantly ferritic structure.

Durch das erfindungsgemässe Verfahren und den Einsatz des erfindungsgemässen Modifikationskörpers wird ein Gussstück aus Kugelgraphit hergestellt, das vorzugsweise eine Brinellhärte von 170 HB nicht überschreitet. Als vorteilhaft hat sich eine Brinellhärte von 140-170 HB gezeigt.The method according to the invention and the use of the modification body according to the invention produce a cast piece made of spheroidal graphite which preferably does not exceed a Brinell hardness of 170 HB. A Brinell hardness of 140-170 HB has proven to be advantageous.

Das Gefüge des Gussstücks aus Kugelgraphit ist vorzugsweise mehrheitlich ferritisch.The structure of the cast piece made of spheroidal graphite is preferably predominantly ferritic.

Ein Ausführungsbeispiel der Erfindung wird anhand des unten aufgeführten Beispiels beschrieben, wobei sich die Erfindung nicht nur auf das Ausführungsbeispiel beschränkt.An exemplary embodiment of the invention is described using the example given below, the invention not being restricted to the exemplary embodiment.

Eine Schmelze von Gusseisen mit Kugelgraphit weist, bedingt durch verunreinigten Stahlschrott als Einsatzmaterial, einen Mn-Gehalt von 0.35 Gew.-% auf und ist damit zu hoch für die gewünschte Anwendung, da laut den vorliegenden Analysenvorschriften ein maximaler Mn-Gehalt von 0.25 Gew.-% zulässig ist. Durch den zu hohen Mn-Gehalt in der vorliegenden Schmelze bzw. Gusseisen resultierte in den abgegossenen Gussstücken eine Brinellhärte von 190 HB anstatt der max. 170 HB, welche gemäss den Vorschriften zulässig ist. Die erzielte Brinellhärte von 190 HB und ein entsprechender Perlitgehalt von 30 Flächen-%, anstatt, wie ein maximal vorgeschriebener Perlitgehalt von 25 Flächen-%. führte dazu, dass die Gussstücke verschrottet werden mussten.A melt of spheroidal graphite cast iron has an Mn content of 0.35% by weight due to contaminated steel scrap as input material and is therefore too high for the desired application, since according to the present analysis instructions a maximum Mn content of 0.25% by weight. -% is permissible. The excessively high Mn content in the existing melt or cast iron resulted in a Brinell hardness of 190 HB instead of the maximum 170 HB, which is permissible according to the regulations. The achieved Brinell hardness of 190 HB and a corresponding pearlite content of 30 area% instead of a maximum prescribed perlite content of 25 area%. led to the castings having to be scrapped.

Bei einem Giessgewicht von 50 kg wurde deshalb in jede Giessform ein 50 Gramm schwerer Modifikationskörper, welcher 10 Gew.-% Bor enthält, in das Giesssystem eingelegt, vorzugsweise zwischen Einguss und Filter bzw. vor den Filter.With a casting weight of 50 kg, a modification body weighing 50 grams, which contains 10% by weight of boron, was therefore placed in the casting system in each casting mold, preferably between the sprue and the filter or in front of the filter.

Dadurch wurde während des Giessvorgangs kontinuierlich Bor an die Schmelze abgegeben, sodass die Gussstücke einen Borgehalt von 0.006 Gew.-% aufwiesen, wodurch ein Perlitgehalt von 19 Flächen-% und eine Brinellhärte von 167 HB resultierten und die Gussstücke entsprechend verwendungsfähig waren und den geforderten Vorschriften entsprechen.As a result, boron was continuously released into the melt during the casting process, so that the castings had a boron content of 0.006% by weight, resulting in a pearlite content of 19% by area and a Brinell hardness of 167 HB and the castings were usable in accordance with the required regulations correspond.

Ein Ausführungsbeispiel der Erfindung wird anhand der Figur beschrieben, wobei sich die Erfindung nicht nur auf das Ausführungsbeispiel beschränkt. Es zeigt:
Fig. 1 eine schematische Darstellung eines Giesssystems mit einem erfindungsgemässen Modifikationskörper.An exemplary embodiment of the invention is described with reference to the figure, the invention not being restricted to the exemplary embodiment. It shows:
Fig. 1 a schematic representation of a casting system with a modification body according to the invention.

Fig. 1 zeigt eine schematische Ansicht eines Giesssystems 1 wobei der erfindungsgemässe Modifikationskörper 6 vor dem Filter 3 angeordnet ist, was eine mögliche Anordnung des Modifikationskörpers 6 zeigt. Über den Einguss 2 wird die Schmelze von Gusseisen mit Kugelgraphit in das Giesssystem 1 eingebracht. Die Schmelze umströmt den Modifikationskörper 6 und nimmt daraus die gewünschte Menge an Bor auf. Anschliessend durchströmt die Schmelze den Filter 3 um unerwünschte Verunreinigungen heraus zu filtrieren. Die Schmelze im darauffolgenden Speiser 4 dient der kontinuierlichen Nachspeisung der Schmelze im Gussstück 5 während der Abkühlung. Fig. 1 shows a schematic view of a casting system 1 wherein the modification body 6 according to the invention is arranged in front of the filter 3, which is a possible arrangement of the modification body 6 shows. The melt of cast iron with spheroidal graphite is introduced into the casting system 1 via the sprue 2. The melt flows around the modification body 6 and absorbs the desired amount of boron from it. The melt then flows through the filter 3 in order to filter out unwanted impurities. The melt in the subsequent feeder 4 is used to continuously replenish the melt in the casting 5 during cooling.

Claims (5)

  1. Method for the production of a cast part (5) made of spheroidal graphite cast iron, characterized in that at least one modification body (6) with a predominantly ferritic structure and containing a carrier material made of an iron-silicon alloy and 7-16 weight percent of boron is inserted into the casting system (1) prior to casting.
  2. Method for the production of a cast part (5) made of spheroidal graphite cast iron according to Claim 1, characterized in that at least one modification body (6) is inserted, prior to casting, into the casting system (1) between the pouring cup (2) and the filter (3).
  3. Method for the production of a cast part (5) made of spheroidal graphite cast iron according to Claim 1, characterized in that at least one modification body (6) is added to the melt prior to casting.
  4. Method for the production of a cast part (5) made of spheroidal graphite cast iron according to one of the preceding claims, characterized in that the number of modification bodies (6) is chosen so as to achieve a boron content in the cast part (5) of 0.002-0.008 weight percent, wherein the cast part (5) made of spheroidal graphite cast iron preferably has a predominantly ferritic structure.
  5. Method for the production of a cast part (5) made of spheroidal graphite cast iron according to one of the preceding claims, characterized in that the number of modification bodies (6) is chosen so as to achieve a Brinell hardness of at most 170 HB, preferably the Brinell hardness is in the range 140-170 HB.
EP15194848.6A 2015-11-17 2015-11-17 Process for the production of a cast piece from cast iron with spheroidal graphite Active EP3170578B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15194848.6A EP3170578B1 (en) 2015-11-17 2015-11-17 Process for the production of a cast piece from cast iron with spheroidal graphite
US15/350,126 US20170136537A1 (en) 2015-11-17 2016-11-14 Modification body
CN201611011585.2A CN106975740A (en) 2015-11-17 2016-11-17 modified body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15194848.6A EP3170578B1 (en) 2015-11-17 2015-11-17 Process for the production of a cast piece from cast iron with spheroidal graphite

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EP3170578A1 EP3170578A1 (en) 2017-05-24
EP3170578B1 true EP3170578B1 (en) 2021-06-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280284A (en) * 1940-10-02 1942-04-21 Electro Metallurg Co Method and agent for treating iron and steel
JPS59137155A (en) * 1983-01-25 1984-08-07 Toshiba Corp In-mold inoculant
US4867227A (en) * 1987-08-07 1989-09-19 Metallgesellschaft Aktiengesellschaft Process and apparatus for inoculating cast iron
WO2006068487A1 (en) * 2004-12-23 2006-06-29 Elkem Asa Modifying agents for cast iron
ES2342758A1 (en) * 2008-12-18 2010-07-13 Fagor, S.Coop. Manufacturing process of a spheral foundry (Machine-translation by Google Translate, not legally binding)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3030204A (en) * 1960-04-07 1962-04-17 Vanadium Corp Of America Process of making ferroalloys
SE321095B (en) * 1967-06-08 1970-02-23 Jaernfoeraedling Ab
SE406930B (en) * 1973-05-28 1979-03-05 Pont A Mousson PROCEDURE FOR NODULARIZATION OF GRAPHITE IN MELTED CAST IRON WITH MODULARIZING AGENT IN THE FORM OF PELLETS
CN1015553B (en) * 1990-01-23 1992-02-19 清华大学 Strong Inking Inoculant for Cast Iron
DE10129382A1 (en) * 2001-06-20 2003-01-02 Fischer Georg Fahrzeugtech nodular cast iron
DE102004056331A1 (en) * 2004-11-22 2006-05-24 Georg Fischer Fahrzeugtechnik Ag Ductile cast iron alloy and method for producing castings from nodular cast iron alloy
JP4974591B2 (en) * 2005-12-07 2012-07-11 旭テック株式会社 Graphite spheroidizing agent and method for producing spheroidal graphite cast iron using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280284A (en) * 1940-10-02 1942-04-21 Electro Metallurg Co Method and agent for treating iron and steel
JPS59137155A (en) * 1983-01-25 1984-08-07 Toshiba Corp In-mold inoculant
US4867227A (en) * 1987-08-07 1989-09-19 Metallgesellschaft Aktiengesellschaft Process and apparatus for inoculating cast iron
WO2006068487A1 (en) * 2004-12-23 2006-06-29 Elkem Asa Modifying agents for cast iron
ES2342758A1 (en) * 2008-12-18 2010-07-13 Fagor, S.Coop. Manufacturing process of a spheral foundry (Machine-translation by Google Translate, not legally binding)

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EP3170578A1 (en) 2017-05-24
US20170136537A1 (en) 2017-05-18

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