EP0499269B1 - Cored wire for inoculation - Google Patents
Cored wire for inoculation Download PDFInfo
- Publication number
- EP0499269B1 EP0499269B1 EP92102504A EP92102504A EP0499269B1 EP 0499269 B1 EP0499269 B1 EP 0499269B1 EP 92102504 A EP92102504 A EP 92102504A EP 92102504 A EP92102504 A EP 92102504A EP 0499269 B1 EP0499269 B1 EP 0499269B1
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- EP
- European Patent Office
- Prior art keywords
- magnesium
- inoculation
- cast iron
- wire
- silicon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000011081 inoculation Methods 0.000 title claims abstract description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011777 magnesium Substances 0.000 claims abstract description 21
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 17
- 239000010439 graphite Substances 0.000 claims abstract description 17
- 229910021338 magnesium silicide Inorganic materials 0.000 claims abstract description 15
- YTHCQFKNFVSQBC-UHFFFAOYSA-N magnesium silicide Chemical compound [Mg]=[Si]=[Mg] YTHCQFKNFVSQBC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 239000002054 inoculum Substances 0.000 description 9
- 239000000155 melt Substances 0.000 description 9
- 229960005486 vaccine Drugs 0.000 description 7
- 229910001141 Ductile iron Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910005347 FeSi Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000029142 excretion Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000002255 vaccination Methods 0.000 description 2
- 229910019752 Mg2Si Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000009862 microstructural analysis Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Images
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
Definitions
- the invention relates to a seed wire for the production of cast iron with spheroidal graphite or vermicular graphite, which consists of a hollow wire containing powdered ferrosilicon with a sheath made of steel, copper, nickel or aluminum alloy.
- cast iron melts are treated with pure magnesium or magnesium master alloy in order to achieve a spherical or vermicular formation of the graphite in the cast iron matrix and thereby to influence the mechanical-technological properties of the workpieces cast therefrom in an advantageous manner.
- the solubility of the carbon is locally reduced by the high silicon content in the inoculant, so that the graphite excretion during solidification is facilitated.
- Subcooling of the cast iron melt is significantly reduced, the number of eutectic cells or spherulites is increased, and the structure is thus more fine-grained.
- the low inoculant addition of approximately 0.05 to a maximum of 1.0% corresponds to a silicon absorption of the melt from 0.05 to 0.80%.
- the aim is generally to use small amounts of inoculants, but effective inoculants.
- the addition of inoculants improves mechanical and physical properties such as tensile strength, toughness and elongation.
- the vaccine should be added as shortly as possible before solidification, for example by using the form vaccination method. It is also known to accommodate powdered ferrosilicon alloys in comparatively thin-walled hollow wires made of steel, copper, nickel or aluminum alloys (company brochure: INFORM vaccination wire, CHEMETALL GmbH, Frankfurt, March 1988).
- INFORM vaccination wire CHEMETALL GmbH, Frankfurt, March 1988.
- the inoculation wire is wound into the cast iron melt at a constant speed or, when the melt is poured, fed into the pouring stream. Since the end of the inoculation wire to be melted is in the cast iron melt or pouring stream, there is an ideal, uniform addition and a controlled distribution of the inoculant in the melt.
- a decay effect also occurs in the treatment of the cast iron melt with magnesium or magnesium alloy, which is all the greater as the time interval between the treatment and the pouring of the melt is greater under operational conditions than after the treatment of the melt with a vaccine. For this reason, the treatment of the cast iron melt with magnesium or magnesium alloy must always be carried out with an excess of magnesium. This excess is only effective to a limited extent, since the decay effect is increased at the same time.
- US 3,056,190 describes a composite product consisting of an iron tube which contains a sintered filling of magnesium and silicon or silicon-containing material, namely ferrosilicon, the silicon content being 0.56 to 1.5 parts per part of magnesium and the iron content of the filling 30 Wt .-% does not exceed.
- the object of the invention to further improve the accuracy in the manufacture of products from spheroidal graphite or vermicular graphite cast iron and to provide a seed wire of the construction described at the outset, the filling causes a significant increase in the inoculation effect compared to inoculants made of ferrosilicon alloys and also reduces the decay effect associated with the magnesium treatment.
- a seed wire with a sheath made of steel, copper, nickel or aluminum and alloys thereof and ferrosilicon powder as the filling which is characterized in that the filling contains 1 to 50 vol .-% powdered magnesium silicide.
- the sheath of the hollow wire dissolves completely and releases the inoculant mixture which essentially consists of ferrosilicon alloy and magnesium silicide and forms the filling.
- the inoculant mixture which essentially consists of ferrosilicon alloy and magnesium silicide and forms the filling.
- the magnesium silicide used for filling the hollow wire according to the invention preferably has a composition of 55 to 63% by weight of magnesium and 36.6 to 45% by weight of silicon.
- the stoichiometric silicon content (36.6% by weight) of the magnesium silicide is not undercut.
- the magnesium silicide therefore preferably contains a small excess of silicon.
- a magnesium silicide which is composed of 58 to 62% by weight of magnesium and 37 to 42% by weight of silicon is particularly preferably used.
- a content of rare earth metals of up to 1% by weight, preferably 0.5 to 0.75% by weight, in the magnesium silicide increases the spheroidal graphite-forming effect of the magnesium and the quiet course of the reaction.
- a calm, controlled course of the reaction is a necessary prerequisite for the safe setting of a desired residual magnesium content in the cast iron melt with a high magnesium yield.
- the filling of the seed wire can also contain 1 to 15% by weight of carbon and / or 1 to 50% by weight of silicon carbide.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Graft Or Block Polymers (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
Description
Die Erfindung betrifft einen Impfdraht zur Herstellung von Gußeisen mit Kugelgraphit bzw. Vermikulargraphit, der aus einem pulverförmiges Ferrosilizium enthaltenden Hohldraht mit einem Mantel aus Stahl, Kupfer, Nickel oder Aluminiumlegierung besteht.The invention relates to a seed wire for the production of cast iron with spheroidal graphite or vermicular graphite, which consists of a hollow wire containing powdered ferrosilicon with a sheath made of steel, copper, nickel or aluminum alloy.
Bekanntlich werden Gußeisenschmelzen mit Reinmagnesium bzw. Magnesiumvorlegierung behandelt, um eine kugelförmige bzw. vermikulare Ausbildung des Graphits in der Gußeisenmatrix zu erreichen und dadurch die mechanisch-technologischen Eigenschaften der daraus gegossenen Werkstücke in vorteilhafter Weise zu beeinflussen.As is known, cast iron melts are treated with pure magnesium or magnesium master alloy in order to achieve a spherical or vermicular formation of the graphite in the cast iron matrix and thereby to influence the mechanical-technological properties of the workpieces cast therefrom in an advantageous manner.
Bei der Herstellung von Gußeisen mit Kugelgraphit bzw. Vermikulargraphit ist die Nachbehandlung der Gußeisenschmelze durch Impfen mit besonderen Impflegierungen in aller Regel Bestandteil der Produktionstechnik, um den gestiegenen Qualitätsansprüchen gerecht zu werden, wobei insbesondere Ferrosiliziumlegierungen (DIN 17560; Firmenprospekt: GfE Gesellschaft für Elektrometallurgie mbH, Düsseldorf, Mai 1989; Firmenprospekt: Metallgesellschaft AG, Frankfurt, Metallurgie und Gießereitechnik, Juni 1979, S. 10/11) sehr häufig angewendete Impfmittel sind. Durch die keimbildende Wirkung des Impfmittels wird die Gefahr der Karbidbildung verhindert. Die Wirkung beruht darauf, daß das Impfmittel Keime für die Graphitausscheidung bildet. Ferner wird durch den hohen Siliziumgehalt im Impfmittel örtlich die Löslichkeit des Kohlenstoffs herabgesetzt, so daß die Graphitausscheidung bei der Erstarrung erleichtert wird. Eine Unterkühlung der Gußeisenschmelze wird deutlich verringert, die Anzahl der eutektischen Zellen bzw. Sphärolithen vergrößert und damit das Gefüge feinkörniger. Die geringe Impfmittelzugabe von etwa 0,05 bis maximal 1,0 % entspricht einer Silizium-Aufnahme der Schmelze von 0,05 bis 0,80 %. Zur Begrenzung der Silizium-Aufnahme sowie des Temperaturverlustes der Schmelze wird i.a. der Einsatz von geringen Impfmittelmengen, jedoch effektiven Impfmitteln angestrebt. Durch den Zusatz von Impfmitteln werden mechanische und physikalische Eigenschaften, wie Zugfestigkeit, Zähigkeit und Dehnung verbessert.In the production of cast iron with spheroidal graphite or vermicular graphite, the aftertreatment of the cast iron melt by inoculation with special inoculant alloys is generally part of the production technology in order to meet the increased quality requirements, in particular ferrosilicon alloys (DIN 17560; company brochure: GfE Gesellschaft für Elektrometallurgie mbH, Düsseldorf, May 1989; Company brochure: Metallgesellschaft AG, Frankfurt, Metallurgy and Foundry Technology, June 1979, pp. 10/11) are very frequently used vaccines. The germ-forming effect of the vaccine prevents the risk of carbide formation. The effect is based on the fact that the vaccine forms germs for graphite excretion. Furthermore, the solubility of the carbon is locally reduced by the high silicon content in the inoculant, so that the graphite excretion during solidification is facilitated. Subcooling of the cast iron melt is significantly reduced, the number of eutectic cells or spherulites is increased, and the structure is thus more fine-grained. The low inoculant addition of approximately 0.05 to a maximum of 1.0% corresponds to a silicon absorption of the melt from 0.05 to 0.80%. To limit the silicon absorption and the loss of temperature of the melt, the aim is generally to use small amounts of inoculants, but effective inoculants. The addition of inoculants improves mechanical and physical properties such as tensile strength, toughness and elongation.
Da die Impfwirksamkeit des Impfmittels einem zeitlichen Abklingeffekt unterliegt, sollte die Zugabe des Impfmittels so kurz wie möglich vor der Erstarrung erfolgen, beispielsweise durch Anwendung des Formimpf-Verfahrens. Es ist auch bekannt, pulverförmige Ferrosiliziumlegierungen in vergleichsweise dünnwandigen Hohldrähten aus Stahl, Kupfer, Nickel oder Aluminiumlegierungen unterzubringen (Firmenprospekt: INFORM-Impfdraht, CHEMETALL GmbH, Frankfurt, März 1988). Der Impfdraht wird mit gleichbleibender Geschwindigkeit in die Gußeisenschmelze gespult oder beim Vergießen der Schmelze in den Gießstrahl geführt. Da sich das abzuschmelzende Ende des Impfdrahtes in der Gußeisenschmelze bzw. -gießstrahl befindet, erfolgt eine ideale gleichmäßige Zugabe und eine kontrollierte Verteilung des Impfmittels in der Schmelze.Since the vaccine effectiveness of the vaccine is subject to a time-decaying effect, the vaccine should be added as shortly as possible before solidification, for example by using the form vaccination method. It is also known to accommodate powdered ferrosilicon alloys in comparatively thin-walled hollow wires made of steel, copper, nickel or aluminum alloys (company brochure: INFORM vaccination wire, CHEMETALL GmbH, Frankfurt, March 1988). The inoculation wire is wound into the cast iron melt at a constant speed or, when the melt is poured, fed into the pouring stream. Since the end of the inoculation wire to be melted is in the cast iron melt or pouring stream, there is an ideal, uniform addition and a controlled distribution of the inoculant in the melt.
Ein Abklingeffekt tritt auch bei der Behandlung der Gußeisenschmelze mit Magnesium bzw. Magnesiumlegierung auf, der um so stärker ist als unter betrieblichen Bedingungen das Zeitintervall zwischen der Behandlung und dem Vergießen der Schmelze größer als nach der Behandlung der Schmelze mit einem Impfmittel ist. Aus diesem Grunde ist die Behandlung der Gußeisenschmelze mit Magnesium bzw. Magnesiumlegierung stets mit einem Überschuß an Magnesium durchzuführen. Dieser Überschuß ist nur bedingt wirksam, da der Abklingeffekt gleichzeitig verstärkt wird.A decay effect also occurs in the treatment of the cast iron melt with magnesium or magnesium alloy, which is all the greater as the time interval between the treatment and the pouring of the melt is greater under operational conditions than after the treatment of the melt with a vaccine. For this reason, the treatment of the cast iron melt with magnesium or magnesium alloy must always be carried out with an excess of magnesium. This excess is only effective to a limited extent, since the decay effect is increased at the same time.
Aus Gießerei-Praxis Nr. 21, 6. November 1983, S. 313 - 320 (K.J. Best) ist die Magnesiumbehandlung von Gußeisenschmelzen mit Hilfe eines praktisch siliziumfreien Magnesiumbehandlungs-drahtes bekannt. Auf die Pfanne wird ein Deckel mit trichterförmiger Einlaßöffnung für den Drahtgelegt, vgl. Abbildungen 13 und 14.From foundry practice No. 21, November 6, 1983, pp. 313-320 (KJ Best) is the magnesium treatment of cast iron melts with the help of a practically silicon-free magnesium treatment wire known. A lid with a funnel-shaped inlet opening for the wire is placed on the pan, cf. Figures 13 and 14.
US 3 056 190 beschreibt ein zusammengesetztes Produkt bestehend aus einem Eisenrohr, das eine zusammengesinterte Füllung aus Magnesium und Silizium oder Silizium enthaltendem Material nämlich Ferrosilizium enthält, wobei der Siliziumgehalt 0,56 bis 1,5 Teile pro Teil Magnesium beträgt und der Eisengehalt der Füllung 30 Gew.-% nicht überschreitet.US 3,056,190 describes a composite product consisting of an iron tube which contains a sintered filling of magnesium and silicon or silicon-containing material, namely ferrosilicon, the silicon content being 0.56 to 1.5 parts per part of magnesium and the iron content of the filling 30 Wt .-% does not exceed.
Aufgabe der Erfindung ist es daher, die Treffsicherheit bei der Herstellung von Produkten aus Gußeisen mit Kugelgraphit oder Vermikulargraphit weiter zu verbessern und hierzu einen Impfdraht des eingangs beschriebenen Aufbaus bereitzustellen, dessen Füllung eine deutliche Vergrößerung des Impfeffekts im Vergleich zu Impfmitteln aus Ferrosiliziumlegierungen bewirkt und auch den mit der Magnesiumbehandlung verbundenen Abklingeffekt verringert.It is therefore the object of the invention to further improve the accuracy in the manufacture of products from spheroidal graphite or vermicular graphite cast iron and to provide a seed wire of the construction described at the outset, the filling causes a significant increase in the inoculation effect compared to inoculants made of ferrosilicon alloys and also reduces the decay effect associated with the magnesium treatment.
Gelöst wird diese Aufgabe durch einen Impfdraht mit einem Mantel aus Stahl, Kupfer, Nickel oder Aluminium und Legierungen davon und Ferrosiliziumpulver als Füllung, der dadurch gekennzeichnet ist, daß die Füllung 1 bis 50 Vol.-% pulverförmiges Magnesiumsilizid enthält.This object is achieved by a seed wire with a sheath made of steel, copper, nickel or aluminum and alloys thereof and ferrosilicon powder as the filling, which is characterized in that the filling contains 1 to 50 vol .-% powdered magnesium silicide.
Beim Kontakt des erfindungsgemäßen Impfdrahtes mit der Gußeisenschmelze löst sich der Mantel des Hohldrahtes vollständig auf und setzt das im wesentlichen aus Ferrosiliziumlegierung und Magnesiumsilizid bestehende, die Füllung bildende Impfmittelgemisch frei. Dies führt zu einer beachtlichen Erhöhung der Zahl der Keime in der Basis-Gußeisenschmelze und verstärkt gleichzeitig die Wirkung des Magnesiums auf die Kugelgraphit- bzw. Vermikulargraphit-Bildung.Upon contact of the inoculation wire according to the invention with the cast iron melt, the sheath of the hollow wire dissolves completely and releases the inoculant mixture which essentially consists of ferrosilicon alloy and magnesium silicide and forms the filling. This leads to a considerable increase in the number of germs in the base cast iron melt and at the same time increases the effect of the magnesium on spheroidal graphite or vermicular graphite formation.
In der technischen Praxis der Gießereien hat sich herausgestellt, daß ein Behandlungsmittel aus Magnesiumsilizid in der stöchiometrischen Zusammensetzung der Formel Mg₂Si (63,4 Gew-% Magnesium) bei der Behandlung von Gußeisenschmelzen wegen seines relativ hohen Magnesiumgehaltes einen unkontrolliert heftigen Reaktionsverlauf bewirken kann. Aus diesem Grunde hat das für die Füllung des erfindungsgemäßen Hohldrahts verwendete Magnesiumsilizid vorzugsweise eine Zusammensetzung von 55 bis 63 Gew.-% Magnesium und 36,6 bis 45 Gew.-% Silizium.In the technical practice of foundries, it has been found that a treatment agent made of magnesium silicide in the stoichiometric composition of the formula Mg₂Si (63.4% by weight of magnesium) in the treatment of cast iron melts can cause an uncontrolled violent reaction course due to its relatively high magnesium content. For this reason, the magnesium silicide used for filling the hollow wire according to the invention preferably has a composition of 55 to 63% by weight of magnesium and 36.6 to 45% by weight of silicon.
Um einen ruhigen und kontrollierten Reaktionsverlauf zu erzielen, ist es vorteilhaft, wenn der stöchiometrische Siliziumgehalt (36,6 Gew.-%) des Magnesiumsilizids nicht unterschritten wird. Das Magnesiumsilizid enthält deshalb vorzugsweise einen geringen Überschuß an Silizium.In order to achieve a quiet and controlled course of the reaction, it is advantageous if the stoichiometric silicon content (36.6% by weight) of the magnesium silicide is not undercut. The magnesium silicide therefore preferably contains a small excess of silicon.
Besonders bevorzugt wird ein Magnesiumsilizid verwendet, das sich aus 58 bis 62 Gew.-% Magnesium und 37 bis 42 Gew.-% Silizium zusammensetzt.A magnesium silicide which is composed of 58 to 62% by weight of magnesium and 37 to 42% by weight of silicon is particularly preferably used.
Ein Gehalt an Seltenerd-Metallen bis zu 1 Gew.-%, vorzugsweise 0,5 bis 0,75 Gew.-%, im Magnesiumsilizid verstärkt die kugelgraphitbildende Wirkung des Magnesiums sowie den ruhigen Reaktionsverlauf. Ein ruhiger kontrollierter Reaktionsverlauf ist eine notwendige Voraussetzung zur sicheren Einstellung eines gewünschten Restmagnesiumgehalts der Gußeisenschmelze bei gleichzeitig hoher Magnesiumausbeute.A content of rare earth metals of up to 1% by weight, preferably 0.5 to 0.75% by weight, in the magnesium silicide increases the spheroidal graphite-forming effect of the magnesium and the quiet course of the reaction. A calm, controlled course of the reaction is a necessary prerequisite for the safe setting of a desired residual magnesium content in the cast iron melt with a high magnesium yield.
Die Füllung des Impfdrahtes kann außerdem 1 bis 15 Gew.-% Kohlenstoff und/oder 1 bis 50 Gew.-% Siliziumcarbid enthalten.The filling of the seed wire can also contain 1 to 15% by weight of carbon and / or 1 to 50% by weight of silicon carbide.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung beispielsweise näher erläutert.The invention is explained in more detail below with reference to the drawing, for example.
In der Zeichnung stellen dar:
- Figur 1
- das Gefüge von Gußeisen mit Kugelgraphit in perlitischer grauer Grundmasse, das in herkömmlicher Weise mit mit FeSi-Legierung gefülltem Impfdraht behandelt worden ist, in 100-facher Vergrößerung.
- Figur 2
- das Gefüge von Gußeisen mit Kugelgraphit in perlitischer grauer Grundmasse, das mit mit einem Gemisch aus FeSi-Legierung und Magnesiumsilizid gefülltem Impfdraht gemäß Erfindung behandelt worden ist, in 100-facher Vergrößerung.
- Figure 1
- the structure of spheroidal graphite cast iron in pearlitic gray matrix, which has been treated in a conventional manner with inoculation wire filled with FeSi alloy, in 100-fold magnification.
- Figure 2
- the structure of spheroidal graphite cast iron in pearlitic gray matrix, which has been treated with inoculation wire filled with a mixture of FeSi alloy and magnesium silicide according to the invention, in a 100-fold magnification.
Ein Vergleich der in Figur 1 und Figur 2 wiedergegebenen Gefügebilder zeigt augenfällig die kornfeinende Wirkung von Magnesiumsilizid gemäß Figur 2. Die quantitative Gefügeanalyse der Gefüge von Gußeisen mit Kugelgraphit nach Figur 1 und Figur 2 ergibt, daß sich die Anzahl der als schwarze Punkte erkennbaren Sphärolithen von 511/mm² gemäß Figur 1 auf 1256/mm² gemäß Figur 2 mehr als verdoppelt hat, wobei, wie Figur 2 zeigt, daß die einzelnen Sphärolithen des mit dem erfindungsgemäß ausgebildeten Impfdraht behandelten Gußeisens mit Kugelgraphit deutlich kleiner sind.
- Figur 3
- stellt diesen Zusammenhang in einem Balkendiagramm dar, das die Abhängigkeit des mittleren Durchmessers der Sphärolithen von ihrer relativen Häufigkeit zeigt. Es ergibt sich eine deutliche Verschiebung der Durchmesser der Spärolithen des mit dem erfindungsgemäßen Impfdraht behandelten Gußeisens mit Kugelgraphit zu kleineren Durchmessern hin.
- Figur 4
- zeigt ein Balkendiagramm, aus dem hervorgeht, daß bei dem mit erfindungsgemäßem Fülldraht behandelten Gußeisen mit Kugelgraphit auch die Nodularität der einzelnen Spärolithen deutlich zunimmt. Das bedeutet, daß die Tendenz zu einer Entartung der Spärolithen, charakterisiert durch die Anzahl der Spärolithen mit geringer Nodularität, entsprechend deutlich abnimmt.
- Figure 3
- shows this relationship in a bar chart, which shows the dependence of the mean diameter of the spherulites on their relative frequency. There is a clear shift in the diameter of the spherulites of the cast iron with spheroidal graphite treated with the inoculation wire according to the invention towards smaller diameters.
- Figure 4
- shows a bar chart from which it emerges that in the cast iron with spheroidal graphite treated with cored wire according to the invention, the nodularity of the individual spherulites also increases significantly. This means that the tendency to degenerate the spherulites, characterized by the number of spherulites with low nodularity, correspondingly decreases significantly.
Claims (5)
- Inoculation wire consisting of a hollow wire, containing powdered ferrosilicon as filling, with a mantel of steel, copper, nickel or aluminium alloy, for the production of cast iron with spheroidal graphite or vermicular graphite, characterised in that the filling contains 1 to 50 vol.% of powdered magnesium silicide.
- Inoculation wire according to claim 1, characterised in that the magnesium silicide is composed of 55 to 63 wt.% of magnesium and 36 to 45 wt.% of silicon.
- Inoculation wire according to claim 2, characterised in that the magnesium silicide is composed of 58 to 62 wt.% of magnesium and 37 to 42 wt.% of silicon.
- Inoculation wire according to one of claims 1 to 3, characterised in that the magnesium silicide contains 0.01 to 1 wt.%, preferably 0.50 to 0.75 wt.% of rare earth metals.
- Inoculation wire according to one of claims 1 to 4, characterised in that the filling also contains 1 to 15% of carbon and/or 1 to 50% of silicon carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT92102504T ATE101656T1 (en) | 1991-02-14 | 1992-02-14 | VACUATION WIRE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4104562A DE4104562A1 (en) | 1991-02-14 | 1991-02-14 | VACCINE WIRE |
| DE4104562 | 1991-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0499269A1 EP0499269A1 (en) | 1992-08-19 |
| EP0499269B1 true EP0499269B1 (en) | 1994-02-16 |
Family
ID=6425063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92102504A Expired - Lifetime EP0499269B1 (en) | 1991-02-14 | 1992-02-14 | Cored wire for inoculation |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5205856A (en) |
| EP (1) | EP0499269B1 (en) |
| AT (1) | ATE101656T1 (en) |
| CA (1) | CA2061164A1 (en) |
| DE (2) | DE4104562A1 (en) |
| DK (1) | DK0499269T3 (en) |
| ES (1) | ES2050546T3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2637907B2 (en) * | 1992-09-30 | 1997-08-06 | 株式会社神戸製鋼所 | Flux cored wire |
| WO1995011318A1 (en) * | 1993-10-21 | 1995-04-27 | Tovarischestvo S Ogranichennoi Otvetstvennostju Kompania 'sredny Ural' | Process for obtaining cast iron |
| DE19755803A1 (en) * | 1997-12-16 | 1999-07-01 | Winter Fritz Eisengiesserei | Deoxidized cast iron melt is inoculated with a mixture of magnesium and silicon |
| DE10026546B4 (en) * | 2000-05-23 | 2004-09-02 | Heppes, Frank, Dipl.-Ing. | Casting cores and methods for creating voids in castings |
| MC200112A1 (en) * | 2007-12-05 | 2008-07-02 | Luca Cattaneo | A method of modifying the graphitic phase of the melting of the lamellar form to the spheroidal or vermicular form through an animated monophylle |
| US8828117B2 (en) | 2010-07-29 | 2014-09-09 | Gregory L. Dressel | Composition and process for improved efficiency in steel making |
| EP3434799B1 (en) | 2016-03-24 | 2020-07-08 | Hitachi Metals, Ltd. | Method for manufacturing cast article comprising spherical graphite cast iron |
| DE102020004163A1 (en) | 2020-07-10 | 2022-01-13 | Combicore GmbH | Process for the production and use of casting cores for all casting processes, in particular die casting, as well as casting cores produced using this process and intended for the creation of defined cavities in cast parts |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2881068A (en) * | 1952-04-28 | 1959-04-07 | Wargons Ab | Method of treating a ferrous melt with a porous sintered metal body impregnated with a treating agent |
| US3056190A (en) * | 1960-04-06 | 1962-10-02 | Dow Chemical Co | Composite metal article and method of making same |
| DE1458427A1 (en) * | 1963-09-30 | 1969-02-20 | Kazuji Kusaka | Process for the production of a cast iron containing magnesium with spheroidal graphite and a low slag content |
| JPS5112443B1 (en) * | 1965-12-13 | 1976-04-20 | ||
| US4035892A (en) * | 1972-06-30 | 1977-07-19 | Tohei Ototani | Composite calcium clad material for treating molten metals |
| US4698095A (en) * | 1972-06-30 | 1987-10-06 | Tohei Ototani | Composite calcium clads for treating molten iron |
-
1991
- 1991-02-14 DE DE4104562A patent/DE4104562A1/en not_active Withdrawn
-
1992
- 1992-02-12 US US07/834,430 patent/US5205856A/en not_active Expired - Fee Related
- 1992-02-13 CA CA002061164A patent/CA2061164A1/en not_active Abandoned
- 1992-02-14 DE DE92102504T patent/DE59200065D1/en not_active Expired - Fee Related
- 1992-02-14 DK DK92102504.5T patent/DK0499269T3/en active
- 1992-02-14 EP EP92102504A patent/EP0499269B1/en not_active Expired - Lifetime
- 1992-02-14 AT AT92102504T patent/ATE101656T1/en not_active IP Right Cessation
- 1992-02-14 ES ES92102504T patent/ES2050546T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4104562A1 (en) | 1992-08-20 |
| ES2050546T3 (en) | 1994-05-16 |
| US5205856A (en) | 1993-04-27 |
| DE59200065D1 (en) | 1994-03-24 |
| CA2061164A1 (en) | 1992-08-15 |
| DK0499269T3 (en) | 1994-03-21 |
| ATE101656T1 (en) | 1994-03-15 |
| EP0499269A1 (en) | 1992-08-19 |
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