EP1752552B1 - Procédé de la fabrication d'une fonte à graphite vermiculaire - Google Patents

Procédé de la fabrication d'une fonte à graphite vermiculaire Download PDF

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Publication number
EP1752552B1
EP1752552B1 EP20050017145 EP05017145A EP1752552B1 EP 1752552 B1 EP1752552 B1 EP 1752552B1 EP 20050017145 EP20050017145 EP 20050017145 EP 05017145 A EP05017145 A EP 05017145A EP 1752552 B1 EP1752552 B1 EP 1752552B1
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EP
European Patent Office
Prior art keywords
casting
treatment
iron melt
alloy
weight
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 - Fee Related
Application number
EP20050017145
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German (de)
English (en)
Other versions
EP1752552A1 (fr
Inventor
Horst Dr. Ing. Meurer
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.)
Fritz Winter Eisengiesserei GmbH and Co KG
Original Assignee
Fritz Winter Eisengiesserei GmbH and Co KG
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Application filed by Fritz Winter Eisengiesserei GmbH and Co KG filed Critical Fritz Winter Eisengiesserei GmbH and Co KG
Priority to EP20050017145 priority Critical patent/EP1752552B1/fr
Priority to DE200550000531 priority patent/DE502005000531D1/de
Priority to PCT/EP2006/064365 priority patent/WO2007017350A1/fr
Publication of EP1752552A1 publication Critical patent/EP1752552A1/fr
Application granted granted Critical
Publication of EP1752552B1 publication Critical patent/EP1752552B1/fr
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    • 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

Definitions

  • the invention relates to a method for producing vermicular graphite cast iron.
  • vermicular graphite cast iron In classifying the various types of cast iron according to their strength properties, vermicular graphite cast iron, commonly referred to by the abbreviation "GJV”, having strengths in the range of 350 to 500 MPa between fluted graphite cast iron, commonly referred to as “GJL”, and Having strengths in the range of 150 to 350 MPa, and ductile iron, which is commonly referred to as “GJS” and has strengths of 350 to 1000 MPa.
  • GJV vermicular graphite cast iron
  • GJL fluted graphite cast iron
  • GJS ductile iron
  • a well-known method of producing cast iron with vermicular graphite which is simple to process is to add to the molten iron to be cast a rare earth metal, for example cerium, in an amount which is adjusted as a function of the sulfur content.
  • An overdose must be avoided in order to avoid the formation of unwanted To avoid structure and the so-called "white solidification" (Foundry Lexicon Edition 2001, 18th ed., Page 573).
  • treatment of the cast iron melt to be cast with FeSiMg is also usually carried out in order to produce magnesium silicates in cast iron.
  • These magnesium silicates have proven to be particularly effective nucleating agents.
  • the addition of magnesium to the molten iron also deoxidizes the melt. Since the effectiveness of the magnesium silicates as nucleating agents is dependent on the oxygen present in the melt, precise control of the oxygen content of the melt is therefore of particular importance.
  • the information required to accurately determine the oxygen content of a cast iron melt can be obtained, for example, from thermal analyzes, EMF measurements, or other analytical techniques related to nucleation and seed growth events.
  • thermal analyzes EMF measurements
  • other analytical techniques related to nucleation and seed growth events.
  • the known ways of determining the amounts of oxygen and mixed oxides to be added to an iron melt to achieve the desired graphitization prove to be difficult to handle.
  • they require a high equipment and metrological effort, which is not only costly, but under the existing operating conditions is also prone to failure.
  • EP 0 131 091 A2 discloses a high-alloyed iron-carbon casting material with an austenitic cast structure whose carbon is formed predominantly as vermiculare graphite excretion. High strength values of this cast material can be achieved by adjusting its residual magnesium content to a range of 0.01 to 0.04% by weight.
  • a treatment additive for adjusting this Resrmagnesiumgehalts is used according to the known method as an alternative to a FeSiMg alloy, for example, a NiMg alloy.
  • the object of the invention was to provide a suitable and easy to use method for large-scale industrial practice, which allows the targeted production of castings with Vermikulgraphitguss.
  • This object is achieved according to the invention by a method in which a molten iron contained in a treatment vessel under an inert atmosphere whose sulfur content is less than 0.05 wt .-%, formed from magnesium and another metal exclusion of silicon Mg treatment alloy is added until the magnesium content of the molten iron 0.005 - 0.018 wt .-%, wherein the to be set in the molten iron (S) Mg content at a modulus of 0.15 to ⁇ 0.65 cm 0.005 - 0.009 wt.
  • % in particular 0.005 to 0.008 wt .-%, with a modulus of 0.65 to ⁇ 1.2 cm 0.007 to 0.012 wt .-%, in particular> 0.008 to 0.011 wt .-% and at a modulus of 1.2 to 2, 0 cm is 0.010-0.018% by weight, in particular> 0.011-0.018% by weight.
  • the melt stored in a suitable container is treated under a protective gas atmosphere with a magnesium-containing alloy which, in addition to the magnesium content, contains at least one further metal but no silicon.
  • the Mg-metal treatment alloy is added until a magnesium content which is prescribed within narrow limits and is set down on the module of the cast piece to be cast from the molten iron is reached.
  • the Mg contents are assigned to the various module regions of the castings to be cast, which are preferably set for the particularly accurate generation of vermicular graphite castings in the respective castings in the manner according to the invention:
  • Module (in cm) Wall thickness range Mg content of iron melt (in% by weight) 0.15 to ⁇ 0.65 thin 0.005 - 0.009, especially 0.005 to 0.008 0.65 to ⁇ 1.2 medium 0.007-0.012, especially> 0.008-0.011 1.2 to 2.0 thick 0.010-0.018, especially> 0.011-0.018
  • the sulfur content of a cast iron melt used according to the invention is limited to a maximum of 0.05% by weight in order to ensure that the magnesium added according to the invention is available in the fullest possible extent for the graphitization. In order to use this effect as safely as possible, the sulfur content should be as low as possible. Accordingly, an advantageous embodiment of the invention provides that the S content of the molten iron is less than 0.015 wt .-%.
  • the inert, with respect to the molten iron inert atmosphere required for the inventive treatment with the metal-Mg alloy in the treatment vessel can be prepared in a simple and cost-effective manner, that over the melt in the treatment vessel, a nitrogen atmosphere is formed.
  • the treatment alloy In order to reliably avoid contamination of the molten iron with atmospheric oxygen even during the addition of the treatment alloy, the treatment alloy should be supplied via an inert gas lock.
  • the process reliability with which the method according to the invention is operated can be improved by detecting, during the addition of the treatment alloy, the respective current Mg content of the molten iron and comparing it with the respectively preset desired value.
  • the Detection of the Mg content can be carried out continuously or discontinuously at suitable time intervals.
  • a significant advantage of the invention consists in the fact that practical experiments have proven that it is sufficient for the targeted production of Vermikulgraphitguss to use the Mg content as the only parameter for adjusting the composition of the melt. This possibility leads to a drastic reduction of the metrological and other apparatus expense required for carrying out the method according to the invention compared with the methods of melt treatment conventionally used in the production of GJV.
  • As measuring instruments for the determination of the respective Mg content of the molten iron treated in accordance with the invention it is possible to use, for example, conventional spectrometers which are usually available for the analysis of a melt composition.
  • the measurement of the Mg content is preferably carried out at the outlet of the respective treatment vessel. In this way, it is ensured that the melt jet emerging from the treatment vessel actually corresponds in terms of its Mg content to the requirements resulting from the module of the respective casting.
  • the treatment vessel is a Verg cordofen. From such an oven or similarly designed treatment vessels, the molten iron can be poured directly into the mold casting the respective casting.
  • the iron melt emerging from the treatment vessel and previously treated with the metal Mg treatment alloy in accordance with the invention can be additionally inoculated in a manner known per se with a suitable inoculant in order to bring a void-free and white-irradiation-free iron into the casting mold.
  • This inoculation can take place in the spout opening of the respective treatment vessel.
  • an inoculating agent can also be added to the effluent pouring stream or only in the casting mold of the melt, if an optimized distribution of the inoculating agent in the melt can be achieved in this way.
  • the device 1 for treating and potting the molten iron S having a sulfur content of at most 0.01 wt .-% comprises a designed in a conventional manner siphon-Verg cordofen 2 with a treatment vessel 3, in the region of its open top by a outside domed lid 4 opposite the environment 5 is completed.
  • a side wall of the treatment tank 3 near the cover 4 associated edge opens the supply line 6 of a nitrogen supply 7.
  • the filled into the treatment tank 3 molten iron S is held by the nitrogen supply 7 permanently under a respect to the molten iron inertly behaving nitrogen atmosphere A.
  • the nitrogen supply 7 in the above the molten iron S existing, surrounded by the side walls of the treatment vessel 3, the melt S and the lid 4 upper, free of melt section 8 of the interior of the treatment vessel 3 nitrogen gas is passed.
  • a lock 9 is mounted for the supply of treatment alloy B in the treatment tank 3, the lock channel leads through the lid 4 in the upper free portion 8 of the interior of the treatment tank 3.
  • the lock 9 is purged of nitrogen gas, so that even when introducing the treatment alloy B in the melt S, the penetration of oxygen-containing ambient atmosphere is prevented in the interior of the treatment vessel 3.
  • the treatment container 3 has in its upper, adjacent to the lid 4 section on a laterally projecting, upwardly open spout 10, in which a downwardly leading pouring spout 11 is formed.
  • the pouring spout 11 is connected to the interior of the treatment container 3 via a siphon 10a leading into the treatment container 3 and ending shortly before its bottom.
  • the bath level of the molten iron S contained in the treatment tank 3 is below the level of the spout 10.
  • a pressure control not shown here is provided, which regulates the prevailing over the molten iron S pressure of the maintained there inert atmosphere A.
  • the outflow of molten iron S from the spout opening 11 is regulated via a plug 12 which can be lowered into the spout opening 11 and can be raised out of it.
  • the filling opening of a casting mold 13 is arranged, in which the casting to be produced is formed.
  • a sprue siphon is provided in a manner known per se, the illustration of which has been omitted here for reasons of clarity.
  • treatment alloy B The amount of treatment alloy B introduced into the interior of the treatment tank 3 falls on the melt S and, due to its higher weight, sinks into the melt S, where it is finally melted.
  • a treatment alloy B for example, CuMg, NiMg or a combination of these alloys is used.
  • the molten iron S is driven by increasing the pressure of the atmosphere A through the siphon 10a to the spout 10 and taken there a first melt sample. Its magnesium content is then determined by means of a spectrometer 14. If the magnesium content of the sample does not correspond to the magnesium content required for the reliable adjustment of a vermicular structure over all wall thicknesses of the casting to be produced in the casting mold 13, a corresponding signal is given to a metering device 15. This then passes through the lock 9, a further portion of treatment alloy B in the treatment tank 3, which corresponds to the amount of treatment alloy B, which is sufficient mathematically or on the basis of empirical values for the achievement of the target magnesium content of the molten iron S.
  • the pouring opening 11 of the pouring spout 10 is opened by lifting the plug 12, and the molten iron S is continuously conveyed from the processing vessel 3 into the pouring spout 10 by appropriate regulation of the pressure of the atmosphere A.
  • an inoculating agent is fed in wire form, which melts on contact with the hot melt, so that distribute its constituents uniformly in the pouring stream G and are washed into the mold 13.
  • the in the pouring stream G given inoculation prevents the casting produced in the mold 13, the formation of voids and the formation of white radiation in the cast structure.

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

Claims (10)

  1. Procédé de fabrication de fonte à graphite vermiculaire, dans lequel on ajoute à de la fonte en fusion (S) contenue sous une atmosphère inerte (A) dans un récipient de traitement (3) et dont la teneur en soufre est inférieure à 0,05 % en poids, un alliage (B) de traitement au Mg formé de magnésium et d'un autre métal à l'exclusion du silicium, jusqu'à ce que la teneur en magnésium de la fonte en fusion soit de 0,005 à 0,018 % en poids, la teneur en Mg à établir dans la fonte en fusion (S) pour un module de la pièce de fonte de 0,15 à < 0,65 cm étant de 0,005 à 0,009 % en poids, de préférence de 0,005 à 0,008 % en poids, pour un module de la pièce de fonte de 0,65 à < 1,2 cm, de 0,007 à 0,012 % en poids et en particulier de > 0,008 à 0,011 % en poids et pour un module de la pièce de fonte de 1,2 à 2,0 cm, de 0,010 à 0,018 % en poids et en particulier de > 0,011 à 0,018 % en poids, et dans le présent cadre, par "module" d'une pièce de fonte, on entend le rapport du volume de la pièce de fonte par rapport à la surface émettrice de chaleur: M = V/O, avec M = module de solidification en cm, V = volume de la pièce de fonte en cm3 et O = surface émettrice de chaleur en cm2.
  2. Procédé selon la revendication 1, caractérisé en ce que l'alliage (B) de traitement au Mg est un alliage de Cu et Mg.
  3. Procédé selon la revendication 1, caractérisé en ce que l'alliage (B) de traitement au Mg est un alliage de Ni et Mg.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'atmosphère inerte (A) est une atmosphère d'azote.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'addition de l'alliage (B) de traitement au Mg à la fonte en fusion s'effectue par un sas à gaz inerte.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la teneur en Mg de la fonte en fusion (S) contenue dans le récipient de traitement (B) est déterminée et est utilisée comme unique paramètre pour l'établissement de la composition de la fonte en fusion (S).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le récipient de traitement (3) fait partie d'un four de coulée (2).
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le récipient de traitement (3) présente une ouverture de coulée (11) et en ce que lorsque la fonte en fusion (S) traitée par l'alliage (B) de traitement au Mg est coulée, un agent d'inoculation est ajouté à la fonte en fusion (S) à l'ouverture de coulée (11).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que lors de la coulée de la fonte en fusion (S) traitée avec l'alliage (B) de traitement au Mg, un agent d'inoculation est délivré dans le jet de coulée (G) en écoulement.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que la fonte en fusion (S) traitée avec l'alliage (B) de traitement au Mg est coulée dans un moule de coulée (13), un agent d'inoculation étant ajouté dans la fonte en fusion (S) coulée dans le moule de coulée (13).
EP20050017145 2005-08-05 2005-08-05 Procédé de la fabrication d'une fonte à graphite vermiculaire Expired - Fee Related EP1752552B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20050017145 EP1752552B1 (fr) 2005-08-05 2005-08-05 Procédé de la fabrication d'une fonte à graphite vermiculaire
DE200550000531 DE502005000531D1 (de) 2005-08-05 2005-08-05 Verfahren zum Herstellen von Vermikulargraphitguss
PCT/EP2006/064365 WO2007017350A1 (fr) 2005-08-05 2006-07-18 Procede pour produire de la fonte a graphite vermiculaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050017145 EP1752552B1 (fr) 2005-08-05 2005-08-05 Procédé de la fabrication d'une fonte à graphite vermiculaire

Publications (2)

Publication Number Publication Date
EP1752552A1 EP1752552A1 (fr) 2007-02-14
EP1752552B1 true EP1752552B1 (fr) 2007-03-28

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EP20050017145 Expired - Fee Related EP1752552B1 (fr) 2005-08-05 2005-08-05 Procédé de la fabrication d'une fonte à graphite vermiculaire

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EP (1) EP1752552B1 (fr)
DE (1) DE502005000531D1 (fr)
WO (1) WO2007017350A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007031448A1 (de) 2007-07-05 2009-01-15 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren zum Herstellen von Formteilen für Gießformen, Gießform und Verfahren zum Vergießen einer Metallschmelze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2322671A1 (fr) 2009-10-30 2011-05-18 Casa Maristas Azterlan Méthode de prédiction de la concentration en graphite vermiculaire dans un piéce fondue

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3321311A1 (de) * 1983-06-13 1984-12-13 Klöckner-Humboldt-Deutz AG, 5000 Köln Hochlegierter eisen-kohlenstoff-gusswerkstoff mit einem austenitischen grundgefuege
US4806157A (en) * 1983-06-23 1989-02-21 Subramanian Sundaresa V Process for producing compacted graphite iron castings
EP0142584B1 (fr) * 1983-11-15 1989-03-22 Elkem Metals Company Procédé pour la fabrication d'alliages
US4596606A (en) * 1984-09-04 1986-06-24 Ford Motor Company Method of making CG iron
SE502227C2 (sv) * 1993-12-30 1995-09-18 Sintercast Ab Förfarande för kontinuerligt tillhandahållande av förbehandlat smält järn för gjutning av föremål av kompaktgrafitjärn
SE513956C2 (sv) 1998-03-27 2000-12-04 Cgi Promotion Ab Förfarande för framställning av föremål av gjutjärn med kompaktgrafit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007031448A1 (de) 2007-07-05 2009-01-15 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren zum Herstellen von Formteilen für Gießformen, Gießform und Verfahren zum Vergießen einer Metallschmelze

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DE502005000531D1 (de) 2007-05-10
EP1752552A1 (fr) 2007-02-14
WO2007017350A1 (fr) 2007-02-15

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