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EP4023775B1 - Procédé et composition additive pour la production de fonte ductile et utilisation de la composition additive correspondante - Google Patents

Procédé et composition additive pour la production de fonte ductile et utilisation de la composition additive correspondante

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Publication number
EP4023775B1
EP4023775B1 EP20383172.2A EP20383172A EP4023775B1 EP 4023775 B1 EP4023775 B1 EP 4023775B1 EP 20383172 A EP20383172 A EP 20383172A EP 4023775 B1 EP4023775 B1 EP 4023775B1
Authority
EP
European Patent Office
Prior art keywords
molten iron
composition
iron
additive composition
additive
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.)
Active
Application number
EP20383172.2A
Other languages
German (de)
English (en)
Other versions
EP4023775A1 (fr
Inventor
Aitor LOIZAGA
Gorka Zarrabeitia
Beñat BRAVO
Susana Méndez
Ramón Suárez
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.)
Fundacion Azterlan
Original Assignee
Fundacion Azterlan
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 Fundacion Azterlan filed Critical Fundacion Azterlan
Priority to EP20383172.2A priority Critical patent/EP4023775B1/fr
Priority to PT203831722T priority patent/PT4023775T/pt
Publication of EP4023775A1 publication Critical patent/EP4023775A1/fr
Application granted granted Critical
Publication of EP4023775B1 publication Critical patent/EP4023775B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • 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
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • the present invention relates to a method for preparing ductile cast iron. Additionally, the present invention relates to an additive composition for preparing ductile cast iron and the use of the additive thereof.
  • Cast iron typically contains between 2% to 4 wt.% carbon.
  • the carbon is intimately mixed with the iron and the form, which the carbon takes in the solidified cast iron, is very important to the characteristics and properties of the iron castings. If the carbon upon solidification takes the form of spheroidal or nodular graphite, the cast iron is referred to as ductile cast iron.
  • raw materials such as pig iron, end-of-life automotive package scrap, steel scrap, foundry returns
  • a typical chemical composition for generic ductile iron applications may comprise:
  • pressurized pouring units with a high storage capacity.
  • heating devices e.g., based on induction heating circuits.
  • spheroidisation An essential treatment of the molten iron for the production of ductile cast iron is called spheroidisation, in which the prerequisites of carbon precipitation process are met in order to allow the graphite precipitating from iron to be formed into spheres.
  • the precipitation of this spheroidal graphite is usually controlled by adding magnesium-rich and/or rare earths-rich ferro-silicon alloys. Magnesium (and/or rare earth elements) reacts with surface active elements (as sulphur or oxygen) acting as nucleation sites for graphite, which promotes the growth of spherical graphite.
  • Another iron melting treatment is inoculation in which, typically, grained ferro-silicon alloyed with some specific elements is added to the melt for increasing the number of nucleation points.
  • inoculants are a mixture of elements that offer the possibility to form stable compounds with, e.g., sulphur, oxygen, nitrogen, titanium, silicon, or combinations thereof.
  • the resulting atomic cluster compounds provide a substrate surface with nucleation sites upon which carbon dissolved in the molten iron can start to grow as graphite flakes or nodules.
  • This treatment may be typically done just before pouring the molten metal into the casting mould or it can be done in the casting mould itself.
  • the time that the metal remains in the pressurized pouring unit before being cast into the moulds may result in a degradation of the metallurgical quality of the molten iron.
  • the holding time and high temperatures achieved in this unit may considerably reduce the stability of the nucleation sites, which tend to float to the surface and to be absorbed in the slag, instead of remaining within the molten iron that is further processed.
  • cast iron melts held in a holding furnace for a long period e.g., more than 1 hour
  • a metal degraded by permanence during long periods in the pressurized pouring unit and at high temperature has a greater tendency to form micro porosities (micro shrinkage) in the solidified cast iron parts, when compared to cast iron parts manufactured in casting units without heating and that use shorter stay times. This is due to the lower potential of said degraded metal to form graphite nodules throughout the solidification process, even if a final inoculation is performed.
  • US6,866,696 discloses an additive for iron and steel production comprising a sulphur-containing material (such as pyrite), an oxide-containing material (such as iron oxide), and a mechanical binder (such as iron powder).
  • a sulphur-containing material such as pyrite
  • an oxide-containing material such as iron oxide
  • a mechanical binder such as iron powder
  • US 2020/399724A1 discloses an inoculant for the manufacture of cast iron comprising a particulate ferrosilicon alloy.
  • Riposan et al. J. of Materi Eng and Perform, 2017, 26, 4217-4226 ) discloses the addition of an inoculant enhancer alloy (S, O, Al, Mg-CaSi alloy and S, O, Al, Ca-FeSi alloy) in the production of ductile cast iron and gray cast iron, respectively.
  • ductile cast iron also known as “ductile iron”, “nodular cast iron”, “spheroidal graphite iron”, “spheroidal graphite cast iron” and “SG iron”
  • ductile iron is a type of graphite-rich cast iron wherein graphite is in the form of nodules.
  • the usual microstructure of ductile cast iron is a matrix of ferrite and pearlite with graphite nodules dispersed throughout the structure.
  • the size, shape and distribution of the graphite nodules is important to the physical properties of the ductile iron.
  • Rounded graphite nodules inhibit the creation of cracks, thus providing the enhanced ductility that gives the alloy its name. Therefore, ductile cast iron has much more impact and fatigue resistance compared to most varieties of cast iron, due to its nodular graphite inclusions.
  • the method of the present invention comprises a step a) of melting a base iron to obtain a molten iron, the base iron having a carbon content from 3.00 wt. % to 4.00 wt. %, a silicon content from 1.50 wt. % to 4.5 wt. % and a sulphur content less than or equal to 0.025 wt. %, wherein the wt. % is based on the total weight of base iron.
  • base iron refers to raw materials for the manufacturing of ductile cast iron.
  • the base iron can be obtained from primary raw materials or from recycled raw materials.
  • suitable raw materials for the manufacturing of ductile cast iron are pig iron, end-of-life automotive package scrap, foundry returns and steel scrap. These raw materials are usually melted in cupola or induction melting furnaces.
  • Suitable base irons for a method as described herein may have a typical chemical composition for generic ductile iron applications.
  • a method as described herein further comprises a step b) of treating the molten iron with a nodulazing composition comprising a source of magnesium and, optionally, a source of rare earth elements to obtain a nodulized molten iron.
  • a "nodulizing composition" comprising a source of magnesium and, optionally, a source of rare earth elements used in a method as described herein may typically be a magnesium-rich, and optionally rare earth-rich (usually cerium).
  • the nodulizing composition may comprise from 4.0 wt. % to 100 wt. % Mg and optionally up to 3 wt. % of rare earth elements.
  • the nodulizing composition may preferably be a magnesium-rich, and optionally rare earth-rich, ferro-silicon alloy composition, such as magnesium ferrosilicon alloy, also referred to as FeSiMg alloy.
  • a ferro-silicon alloy composition to be used as a nodulizing composition may comprise from 4.0 wt.
  • the time that the molten iron remains in the pressurized pouring vessel before being cast into the moulds may result in a degradation of the metallurgical quality of the molten iron, because the holding time and high temperatures achieved in this vessel tend to reduce the nucleation sites, as with time nucleation sites tend to go to the slag and are no longer available for nucleation during casting, i.e., cooling of the molten iron in the mould.
  • the molten iron after holding the molten iron in the pouring vessel the molten iron has a lower sulphur content than the starting base iron, and typically has a sulphur content from 0.002 wt. % to 0.006 wt. %, with respect to the weight of molten iron.
  • a metal degraded by permanence of long periods in the pouring unit and at high temperature has a greater tendency to the formation of micro porosities in the solidified parts, compared to parts manufactured in casting units without heating and shorter stay times, due to the low potential to form graphite throughout the solidification process even in spite of the final inoculation.
  • a method as described herein further comprises a step e) of pushing the molten iron from the pressurized pouring vessel to the pouring basin; a step f) of pouring a stream of the molten iron from the pouring basin into a mould through the stopper/nozzle mechanism; and a step g) of allowing the molten iron to solidify in said mould.
  • a method as described herein additionally comprises treating the molten iron with an additive composition and with an inoculating composition after step d) and prior to step g).
  • the additive composition comprises a source of sulphur, a source selenium and, optionally, a source of tellurium and/or a source of rare earth elements (preferably lanthanum and/or cerium), and comprises a carrier.
  • a source of sulphur a source selenium and, optionally, a source of tellurium and/or a source of rare earth elements (preferably lanthanum and/or cerium)
  • a carrier preferably lanthanum and/or cerium
  • the total content of sulphur, selenium, and optionally, tellurium and/or rare earth elements in the resulting molten iron is increased by a total amount from 0.002 to 0.012 wt. % respect to the weight of the molten iron.
  • an "inoculating composition” used in a method as described herein typically comprises elements that offer the possibility to form stable compounds with, e.g., sulphur, oxygen, nitrogen, titanium, silicon, or combinations thereof.
  • stable compounds forming elements may be selected from Al, Ca, Ba, Sr, Ce, La, Mn, Bi, S, O, Ti, Mg, and Zr. It may be preferred for the inoculating composition to comprise elements selected from Ca, Zr, rare earth elements (e.g., Sr, Ce and La) and Al.
  • an inoculation composition may be a calcium silicon, a calcium bearing ferrosilicon alloys or other ferrosilicon-based alloys that contain small percentages of said stable compounds forming elements.
  • the aim of inoculation is to control the microstructure of cast irons (more fine-grained) as well as reduce the chilling tendency or the formation of iron carbides (or cementite).
  • the inoculant allows to form stable compounds with sulphur, oxygen, nitrogen, titanium, silicon, or combinations thereof.
  • These stable compounds provide a substrate surface with nucleation sites upon which dissolved carbon in the molten iron can start to grow as graphite flakes or nodules, before sufficient undercooling occurs that favours the formation of iron carbide.
  • the presence of iron carbide in the iron matrix is undesirable because this constituent is hard and brittle and can result in poor mechanical properties and machinability.
  • the molten iron is treated, after step d) and prior to step g), either simultaneously with an additive composition and with an inoculating composition, or sequentially, either first with the additive composition, and subsequently with the inoculating composition, or vice versa.
  • the treatment may be performed during the step e) of pushing the molten iron from the pressurized pouring vessel to the pouring basin; or prior to or during the step f) of pouring the molten iron into the mould.
  • the molten iron is first treated with the additive composition, and is subsequently treated with the inoculating composition.
  • the molten iron may be treated with the additive composition during step e) and treated with the inoculating composition during step f).
  • the molten iron is first treated with the inoculating composition, and is subsequently treated with the additive composition.
  • the molten iron may be treated with the inoculating composition during step e) and treated with the additive composition during step f).
  • the molten iron is simultaneously treated with the additive composition and the inoculating composition.
  • the molten iron may be simultaneously treated with the additive composition and the inoculating composition during step e) or during step f).
  • the molten iron is treated with the additive composition and/or the inoculating composition by adding the additive composition and/or the inoculating composition to the molten iron at the pouring basin.
  • the molten iron is treated with the additive composition and/or the inoculating composition by adding the additive composition and/or the inoculating composition to the stream of molten iron before the molten iron gets into the mould.
  • the additive composition and/or the inoculating composition can be added to the stream of molten iron by blowing the additive composition and/or the inoculating composition, e.g., in powder form, onto the stream of molten iron.
  • the molten iron is first treated with the additive composition at the pouring basin (i.e., during step e)), and is subsequently treated with the inoculating composition by adding the inoculating composition to the stream of molten iron before the molten iron gets into the mould (i.e., during step f)).
  • the molten iron is simultaneously treated with the additive composition and the inoculating composition by adding the additive composition and the inoculating composition to the stream of molten iron before the molten iron gets into the mould.
  • the molten iron is treated with the additive composition, by providing the mould with the additive composition (i.e., during step f)).
  • the molten iron is treated with the inoculating composition, by providing the mould with the inoculating composition (i.e., during step f)).
  • the molten iron is simultaneously treated with the additive composition and the inoculating composition, by providing the mould with the additive composition and the inoculating composition (i.e., during step f)).
  • the additive composition may also be referred to as compensative additive, given that the treatment of the molten iron with the additive composition aims to compensate for the elements lost during the holding of the molten iron in the pouring unit.
  • an additive composition as defined above improves the metallurgical quality of molten iron for preparing ductile cast iron generating sequential nucleation sites in which graphite growths decreasing the microporosity (micro shrinkage) on the solidified parts.
  • the sources of sulphur, the sources of selenium, the sources of tellurium and the sources of rare earth elements in the additive composition can be pure sulphur, pure selenium, pure tellurium and pure rare earth elements, or compounds, alloys or salts of such elements. Such sources of sulphur, selenium and of tellurium and of rare earth elements may be added to molten iron independently or as a mixture of two or more of them.
  • Non-limiting examples of sources of sulphur suitable for an additive composition as defined above are pure sulphur and pyrite.
  • Non-limiting examples of sources of selenium suitable for an additive composition as defined above are pure selenium and ferroselenium.
  • Non-limiting examples of sources of tellurium suitable for an additive composition as defined above are pure tellurium and ferrotellurium.
  • Non-limiting examples of sources of rare earth elements suitable for an additive composition as defined above are pure elements (such as cerium, and lanthanum) added in a ferrosilicium base.
  • the additive composition comprises from 2 wt. % to 60 wt. % of sulphur based on the total weight of the additive composition, preferably from 5 wt. % to 30 wt. %.
  • the additive composition comprises from 0.5 wt. % to 20 wt. % of selenium based on the total weight of the additive composition, preferably from 1 wt. % to 10 wt. %.
  • an additive as described herein comprises from 0.001 wt. % to 1 wt. % of tellurium, more preferably from 0.001 wt. % to 0.5 wt. %.
  • an additive as described herein comprises from 0.5 wt. % to 10 wt. % of rare earth elements.
  • the additive composition comprises elements which may act as inoculant.
  • the molten iron may be treated simultaneously with the additive composition and inoculant composition, using such additive compositions.
  • the moulds for each test were produced in consecutive batches in an intensive vertical moulding machine DISAMATIC 240: 20 moulds batch, marked as "0" from the 10th to 12 th mould for the standard process evaluation in Test 0; 20 moulds batch marked as "1” from the 10 th to 12 th mould for pouring basin compensation evaluation in Test 1; and 20 moulds marked as "2" from the 10 th to 12 th for pouring stream compensation evaluation in Test 2. Marked moulds were segregated. So, each bunch have 6 cavities and 3 marked mould per test then 18 castings from each test were segregated and identified by the test number for the shrinkage and micrography evaluation.
  • the melting was done in a medium frequency induction furnace (250Hz, 8.000Kw) with 12 t crucible capacity.
  • composition adjustment was done in the treatment ladles whose capacity was 2500kg.
  • the adjustment additions consisted of 29 kg of 75% FeSi and 0,64 kg graphite recarburizer.
  • the press-pour unit vessel has a max capability of 12 t and a minimum heal level of 6 t.
  • the initial level was 6.5 t and after the tapping two consecutive treated ladles, the trial started with 11.5 t of treated iron in the vessel.
  • the inoculation, for all moulds, was performed in the pouring stream by blowing 0,12 wt. % of a standard inoculating composition during the pouring of the moulds.
  • the pouring temperature was registered by an immersion thermocouple, recording 1406°C.
  • Two thermal analysis cups (PT0, INT0) were collected during the pouring of the first 20 moulds. The melt for both cups were obtained directly at the same time, from the pouring base: PT0 was plane standard thermal analysis cup and INT0 was standard thermal analysis cup with the addition of 0,12 wt. % of the stream inoculant.
  • the pouring of the second batch kept on going up to finishing it.
  • the moulding line was stopped as the last mould of the Test 1 was poured. Then it was checked the proper dosage of a new compensative additive by means of a blowing dosage system at the pouring stream.
  • PT2 was plane standard thermal analysis cup
  • INT2 was standard thermal analysis cup with the addition of 0,12 wt. % of the stream inoculant and 0.1 wt. % of the new compensative additive.
  • Theta angle (or simply ⁇ in figure 1 ), which is the angle of the first derivative at the last minimum before solidification ending ( Figure 1 ).
  • Table 5 summarizes the cooling curve parameters obtained from the test done. Unfortunately, PT1 reading failed because the thermocouple broke during the cooling. Table 5. Cooling curves parameters for each test Test Curve T liquidus (°C) Tmin euctic (°C) Recal.

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  • 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)

Claims (11)

  1. Méthode de préparation de fonte de fer ductile, comprenant les étapes de :
    a) fusion d'un fer de base pour obtenir un fer fondu, le fer de base ayant une teneur en carbone allant de 3,00 % en poids à 4,00 % en poids, une teneur en silicium allant de 1,50 % en poids à 4,5 % en poids et une teneur en soufre inférieure ou égale à 0,025 % en poids, où le % en poids est basé sur le poids total du fer de base ;
    b) traitement du fer fondu avec une composition de nodulation comprenant une source de magnésium et, éventuellement, une source d'éléments de terre rare afin d'obtenir un fer fondu nodulisé ;
    c) introduction du fer fondu nodulisé dans une unité de coulée, où l'unité de coulée comprend un canal d'entrée, une cuve de coulée pressurisée, un bassin de coulée, un mécanisme d'arrêt/de buse, et éventuellement, un inducteur de chauffage ; où le fer fondu nodulisé est introduit dans l'unité de coulée à travers le canal d'entrée dans la cuve de coulée pressurisée ;
    d) maintien du fer fondu dans la cuve de coulée pressurisée ce qui donne un fer fondu ayant une teneur en soufre allant de 0,002 % en poids à 0,006 % en poids ;
    e) poussée du fer fondu depuis la cuve de coulée pressurisée vers le bassin de coulée ;
    f) coulée d'un courant du fer fondu depuis le bassin de coulée dans un moule à travers le mécanisme d'arrêt/de buse ; et
    g) solidification du fer fondu dans ledit moule ;
    dans laquelle le fer fondu est traité, après l'étape d) et avant l'étape g), soit simultanément avec une composition additive et avec une composition d'inoculation, soit séquentiellement, soit d'abord avec la composition additive, et ultérieurement avec la composition d'inoculation, soit inversement ;
    dans laquelle la composition additive comprend une source de soufre, une source de sélénium, et, éventuellement, une source de tellure et/ou une source d'éléments de terre rare, et comprend un support choisi parmi le ferrosilicium, la poudre de fer, et l'oxyde de fer ; et
    dans laquelle la composition additive comprend de 2 % en poids à 60 % en poids de soufre sur la base du poids total de la composition additive, et de 0,5 % en poids à 20 % en poids du sélénium sur la base du poids total de la composition additive ; et
    dans laquelle la teneur totale en soufre, sélénium et éventuellement tellure et/ou éléments de terre rare, dans le fer fondu résultant est augmentée par une quantité totale allant de 0,002 à 0,012 % en poids par rapport au poids du fer fondu.
  2. Méthode selon la revendication 1, dans laquelle le fer fondu est traité par addition de la composition additive et/ou de la composition d'inoculation au fer fondu au niveau du bassin de coulée.
  3. Méthode selon la revendication 1, dans laquelle le fer fondu est traité par addition de la composition additive et/ou de la composition d'inoculation au courant de fer fondu avant que le fer fondu ne pénètre dans le moule.
  4. Méthode selon la revendication 1, dans laquelle le fer fondu est traité en dotant le moule de la composition additive et/ou de la composition d'inoculation avant que le fer fondu ne pénètre dans le moule.
  5. Méthode selon la revendication 1, dans laquelle le fer fondu :
    - est d'abord traité avec la composition additive au niveau du bassin de coulée, et
    - est traité ultérieurement avec la composition d'inoculation par addition de la composition d'inoculation au courant de fer fondu avant que le fer fondu ne pénètre dans le moule.
  6. Méthode selon la revendication 1, dans laquelle le fer fondu est traité simultanément avec la composition additive et la composition d'inoculation par addition de la composition additive et de la composition d'inoculation au courant de fer fondu avant que le fer fondu ne pénètre dans le moule.
  7. Composition additive pour la préparation de fonte de fer ductile selon la méthode selon la revendication 1, l'additif comprenant une source de soufre, une source de sélénium et, éventuellement une source de tellure et/ou une source d'éléments de terre rare, et comprenant un support choisi parmi le ferrosilicium, la poudre de fer, et l'oxyde de fer ; et où la composition additive comprend de 2 % en poids à 60 % en poids de soufre sur la base du poids total de la composition additive, et de 0,5 % en poids à 20 % en poids de sélénium sur la base du poids total de la composition additive.
  8. Composition additive selon la revendication 7, allant de 0,001 % en poids à 1 % en poids de tellure sur la base du poids total de la composition additive.
  9. Composition additive selon l'une quelconque des revendications 7 et 8, dans laquelle l'additif est sous la forme d'une poudre, d'un fil fourré, d'un insert coulé ou d'une poudre comprimée.
  10. Kit comprenant une composition additive selon l'une quelconque des revendications 7 à 9 et une composition d'inoculation, la composition d'inoculation comprenant de préférence des éléments choisis parmi Ca, Zr, des éléments de terre rare et Al.
  11. Utilisation de la composition additive selon l'une quelconque des revendications 7 à 9 dans la production de fonte de fer ductile.
EP20383172.2A 2020-12-29 2020-12-29 Procédé et composition additive pour la production de fonte ductile et utilisation de la composition additive correspondante Active EP4023775B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20383172.2A EP4023775B1 (fr) 2020-12-29 2020-12-29 Procédé et composition additive pour la production de fonte ductile et utilisation de la composition additive correspondante
PT203831722T PT4023775T (pt) 2020-12-29 2020-12-29 Método e composição aditiva para a preparação de ferro fundido dúctil e utilização do aditivo da mesma

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20383172.2A EP4023775B1 (fr) 2020-12-29 2020-12-29 Procédé et composition additive pour la production de fonte ductile et utilisation de la composition additive correspondante

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EP4023775A1 EP4023775A1 (fr) 2022-07-06
EP4023775B1 true EP4023775B1 (fr) 2025-08-20

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6733565B1 (en) 2002-04-24 2004-05-11 Rodney L. Naro Additive for production of irons and steels
NO20172064A1 (en) * 2017-12-29 2019-07-01 Elkem Materials Cast iron inoculant and method for production of cast iron inoculant

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PT4023775T (pt) 2025-10-21

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