EP0498712A1 - Metallurgical additive - Google Patents

Metallurgical additive Download PDF

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Publication number
EP0498712A1
EP0498712A1 EP92400278A EP92400278A EP0498712A1 EP 0498712 A1 EP0498712 A1 EP 0498712A1 EP 92400278 A EP92400278 A EP 92400278A EP 92400278 A EP92400278 A EP 92400278A EP 0498712 A1 EP0498712 A1 EP 0498712A1
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EP
European Patent Office
Prior art keywords
spiral
wire
aluminum
bath
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92400278A
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German (de)
French (fr)
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EP0498712B1 (en
Inventor
Didier Dauby
Jacques Penven
Jean-Paul Rech
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.)
D'investissements Industriels Et Commerc Cie
Original Assignee
Ampere (sa)
D'INVESTISSEMENTS INDUSTRIELS ET COMMERCIAUX Cie
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    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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

Definitions

  • the present invention relates to a dose for metallurgical use intended in particular, but not exclusively, to be introduced into a molten metal bath. It relates more particularly to a dose of aluminum which can be used for the deoxidation of steels during their melting in an oven or in a ladle.
  • This deoxidation is to avoid the formation of gaseous porosities (pitting or blowing), during solidification, by fixing the oxygen by transformation of the aluminum into alumina. It also makes it possible to avoid the formation of type II sulfides at the end of solidification and the appearance of the risk of embrittlement of the joints of primary austenic grains by precipitation of aluminum nitride.
  • the supply of aluminum to the bath is generally carried out continuously, by unwinding a wire from a spool as disclosed by FR-A-2 008 407.
  • EP-A-0 020 307 describes a process for the introduction into a molten metal bath of desulfurizing deoxidizing substances with non-metallic inclusions in which a wire is introduced into the bath by means of a hollow tube shaped in a spiral. But this is a continuous introduction although the length of wire introduced can vary periodically. The tube has a longitudinal vibration which promotes dissolution. However, it is again the continuous introduction of a wire into a bath intended for large installations.
  • the problem which is solved by the present invention is that of obtaining an exact weight of deoxidizing metal in a molten metal, so that the quality of the steel or of the cast iron can be guaranteed.
  • the dose of filler metal is characterized in that it is constituted by a helicoid or spiral, produced from a determined length of calibrated metal wire.
  • the helicoid can thus be made from a primary aluminum wire grading from 99.5 to 99.7.
  • the spiral can be conical, that is to say that the outside diameter of one of the sides of the spiral is less than the diameter of the other side.
  • helix 1 disposed on an introduction bar 2 in a bath of molten metal.
  • the hollow shape of the spiral is suitable for deep introduction into the bath using the bar 2, as in the case of known stars, but any other means of introduction can be used.
  • the spiral has contiguous turns for a reason of space.
  • Figure 3 shows in perspective an alternative embodiment which has, compared to the cylindrical version of the facilities with regard not only to the introduction of a large amount of aluminum but also with regard to transport and storage .
  • this dose from a calibrated wire, also allows a marking which associated with a certificate of conformity eliminates any possibility of confusion with a metal of another origin. This marking occurs at the level of the spiraling machines.
  • the winding of the spiral wire makes it possible to obtain a relatively large weight under a relatively small volume.
  • the weight of one meter of wire is 475 grams.
  • the length of the spiral is 90 mm. and its outside diameter of 80 mm. It is thus easy to vary the length of the spiral in order to satisfy a customer having to introduce into his castings a very precise quantity of aluminum.
  • the minimum diameter of the spiral is at least three times the diameter of the constituent wire.
  • the present invention can be applied to any metal or other filler material which can be produced in the form of wire, in particular for the production of alloys.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Continuous Casting (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

Metal additive intended to be introduced into a molten metal bath. The additive consists of a spiral of calibrated wire cut to a length corresponding to the weight required. <IMAGE>

Description

La présente invention a pour objet une dose à usage métallurgique destinée en particulier, mais non exclusivement, à être introduite dans un bain métallique en fusion. Elle vise plus particulièrement une dose d'aluminium utilisable pour la désoxydation des aciers lors de leur fusion au four ou en poche.The present invention relates to a dose for metallurgical use intended in particular, but not exclusively, to be introduced into a molten metal bath. It relates more particularly to a dose of aluminum which can be used for the deoxidation of steels during their melting in an oven or in a ladle.

On sait qu'il est connu d'ajouter aux aciers et notamment aux aciers au carbone, ou faiblement alliés, une petite quantité d'aluminium qui constitue le désoxydant final. les taux d'addition varient habituellement entre 0,6 et 1,5 % en fonction du taux recherché de fixation de l'oxygène ce qui correspond grosso modo à 1 kg/tonne.It is known that it is known to add to steels and in particular to carbon steels, or low alloyed steels, a small amount of aluminum which constitutes the final deoxidizer. addition rates usually vary between 0.6 and 1.5% depending on the desired rate of oxygen fixation, which roughly corresponds to 1 kg / tonne.

Cette désoxydation a pour but d'éviter la formation de porosités gazeuses (piqûres ou soufflures), au cours de la solidification, en fixant l'oxygène par transformation de l'aluminium en alumine. Elle permet également d'éviter la formation de sulfures de type II en fin de solidification et l'apparition du risque de fragilisation des joints de grains austéniques primaires par précipitation de nitrure d'aluminium.The purpose of this deoxidation is to avoid the formation of gaseous porosities (pitting or blowing), during solidification, by fixing the oxygen by transformation of the aluminum into alumina. It also makes it possible to avoid the formation of type II sulfides at the end of solidification and the appearance of the risk of embrittlement of the joints of primary austenic grains by precipitation of aluminum nitride.

Dans les grandes installations de coulée, l'alimentation du bain en aluminium est généralement effectuée en continu, en déroulant un fil à partir d'une bobine comme divulgué par FR-A-2 008 407.In large casting installations, the supply of aluminum to the bath is generally carried out continuously, by unwinding a wire from a spool as disclosed by FR-A-2 008 407.

EP-A-0 020 307 décrit un procédé d'introduction dans un bain métallique en fusion de substances désoxydantes désulfurisantes avec des inclusions non métalliques dans lequel un fil est introduit dans le bain au moyen d'un tube creux conformé en spirale. Mais il s'agit d'une introduction en continu bien que la longueur de fil introduite puisse varier périodiquement. Le tube est animé d'une vibration longitudinale qui favorise la dissolution. Mais il s'agit à nouveau de l'introduction en continu d'un fil dans un bain destiné aux grandes installations.EP-A-0 020 307 describes a process for the introduction into a molten metal bath of desulfurizing deoxidizing substances with non-metallic inclusions in which a wire is introduced into the bath by means of a hollow tube shaped in a spiral. But this is a continuous introduction although the length of wire introduced can vary periodically. The tube has a longitudinal vibration which promotes dissolution. However, it is again the continuous introduction of a wire into a bath intended for large installations.

Dans les petites et moyennes installations, l'addition d'aluminium s'effectue en amenant dans le bain des quantités déterminées d'aluminium sous forme de lingots comme divulgué par LU-A-66 682 ou encore d'étoiles. Les étoiles sont des pièces moulées à quatre branches percées d'un orifice central. L'introduction des étoiles dans le bain d'acier ou de fonte en fusion se fait au moyen d'une tige en acier passant à travers l' orifice central prévu, notamment, à cet effet. L'aluminium, dont la température de fusion est de 660°C, fond rapidement et se dissout dans le bain dont la température est de l'ordre de 1600°C. Les étoiles pèsent environ 1 kilogramme mais ce poids peut varier de l'ordre de plus ou moins 10% en raison du moulage. Ainsi, dans certains cas le dosage est insuffisant pour obtenir un résultat satisfaisant alors que, lorsque la quantité de métal est excédentaire, l'utilisation de telles étoiles se traduit par une perte financière, le prix de l'aluminium étant très supérieur à celui de l'acier.In small and medium-sized installations, aluminum is added by bringing certain quantities of aluminum into the bath in the form of ingots as disclosed by LU-A-66 682 or even stars. Stars are molded parts with four branches pierced with a central hole. The stars are introduced into the steel or molten iron bath by means of a steel rod passing through the central orifice provided, in particular, for this purpose. Aluminum, whose melting temperature is 660 ° C, melts quickly and dissolves in the bath, the temperature of which is around 1600 ° C. The stars weigh around 1 kilogram but this weight can vary by plus or minus 10% due to the molding. Thus, in certain cases the dosage is insufficient to obtain a satisfactory result whereas, when the quantity of metal is excess, the use of such stars results in a financial loss, the price of aluminum being much higher than that of steel.

Le problème qui est résolu par la présente invention est celui de l'obtention d'un poids exact de métal de désoxydation dans un métal en fusion, afin que la qualité de l'acier ou de la fonte puisse être garantie.The problem which is solved by the present invention is that of obtaining an exact weight of deoxidizing metal in a molten metal, so that the quality of the steel or of the cast iron can be guaranteed.

Selon la présente invention, la dose de métal d'apport est caractérisée en ce qu'elle est constituée par un hélicoïde ou spirale, réalisé à partir d'une longueur déterminée de fil métallique calibré.According to the present invention, the dose of filler metal is characterized in that it is constituted by a helicoid or spiral, produced from a determined length of calibrated metal wire.

Ainsi, c'est la longueur du fil qui va déterminer le poids de l'hélicoïde avec précision. On sait en effet que les tréfileries, notamment d'aluminium délivrent des fils de géométrie parfaite et d'une pureté garantie. L'hélicoïde peut ainsi être constitué à partir d'un fil d'aluminium de première fusion titrant de 99,5 à 99,7.Thus, it is the length of the wire which will determine the weight of the helicoid with precision. We know that wire drawing, in particular aluminum, produces wires of perfect geometry and guaranteed purity. The helicoid can thus be made from a primary aluminum wire grading from 99.5 to 99.7.

Compte tenu de la précision sur le diamètre du fil et de sa densité, il est aisé de constituer des doses de poids exact quine soit pas lié aux dimensions géométriques d'un moule. Par ailleurs, la spirale est aisément obtenue à partir d'une longueur de fil calibré sur les machines destinées à la fabrication des ressorts métalliques.Given the precision on the diameter of the wire and its density, it is easy to constitute doses of exact weight which is not linked to the geometric dimensions of a mold. Furthermore, the spiral is easily obtained from a length of wire calibrated on machines intended for the manufacture of metal springs.

Selon une autre caractéristique de l'invention, la spirale peut être conique, c'est à dire que le diamètre extérieur de l'un des côtés de la spirale est inférieur au diamètre de l'autre côté. Cette caractéristique permet de gerber plusieurs spirales. Il est ainsi possible d'accroître la quantité de métal, tel que de l'aluminium, devant être introduite dans le bain en superposant plusieurs spirales pour éviter de procéder à de nombreuses introductions.According to another characteristic of the invention, the spiral can be conical, that is to say that the outside diameter of one of the sides of the spiral is less than the diameter of the other side. This characteristic makes it possible to stack several spirals. It is thus possible to increase the quantity of metal, such as aluminum, to be introduced into the bath by superimposing several spirals to avoid making numerous introductions.

Enfin, il est également possible de prévoir sur au moins l'une des extrêmités de la spirale un coude servant de blocage de la spirale sur la barre d'introduction dans le bain.Finally, it is also possible to provide on at least one of the ends of the spiral an elbow serving as blocking of the spiral on the insertion bar in the bath.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre de modes particuliers de réalisation, donnés uniquement à titre d'exemples non limitatifs, en regard des dessins qui représentent :

  • La figure 1, un hélicoïde selon l'invention en position sur une barre d'introduction.
  • La figure 2, une vue en bout d'un hélicoïde dont les extrêmités sont coudées.
  • La figure 3, une vue en perspective d'un hélicoïde conique.
Other characteristics and advantages of the invention will appear during the description which follows of particular embodiments, given solely by way of nonlimiting examples, with reference to the drawings which represent:
  • Figure 1, a helicoid according to the invention in position on an introduction bar.
  • Figure 2, an end view of a helicoid whose ends are bent.
  • Figure 3, a perspective view of a conical helicoid.

On a représenté sur la figure 1 un hélicoïde 1 selon l'invention disposé sur une barre d'introduction 2 dans un bain de métal en fusion. La forme creuse de la spirale se prête à l'introduction en profondeur dans le bain à l'aide de la barre 2, comme dans le cas des étoiles connues, mais tout autre moyen d'introduction peut être utilisé. De préférence, la spirale est à spires jointives pour une raison d'encombrement.There is shown in Figure 1 a helix 1 according to the invention disposed on an introduction bar 2 in a bath of molten metal. The hollow shape of the spiral is suitable for deep introduction into the bath using the bar 2, as in the case of known stars, but any other means of introduction can be used. Preferably, the spiral has contiguous turns for a reason of space.

Sur la figure 2, on voit que l'extrêmité 3 du fil a été coudée ce qui autorise un blocage de la spirale sur la barre 2. Le coudage peut être plus ou moins prononcé.In Figure 2, we see that the end 3 of the wire has been bent which allows a blocking of the spiral on the bar 2. The bending can be more or less pronounced.

La figure 3, montre en perspective une variante de réalisation qui présente, par rapport à la version cylindrique des facilités en ce qui concerne non seulement l'introduction d'une quantité d'aluminium importante mais également en ce qui concerne le transport et le stockage.Figure 3 shows in perspective an alternative embodiment which has, compared to the cylindrical version of the facilities with regard not only to the introduction of a large amount of aluminum but also with regard to transport and storage .

La conception de cette dose, à partir d'un fil calibré, permet en outre un marquage qui associé à un certificat de conformité élimine toute possibilité de confusion avec un métal d'une autre origine. Ce marquage intervient au niveau des machines de spiralage.The design of this dose, from a calibrated wire, also allows a marking which associated with a certificate of conformity eliminates any possibility of confusion with a metal of another origin. This marking occurs at the level of the spiraling machines.

L'enroulement du fil en spirale permet d'obtenir un poids relativement important sous un volume relativement faible. Ainsi, pour un fil d'aluminium de 15 mm. de diamètre, le poids d'un mètre de fil est de 475 grammes. La longueur de la spirale est de 90 mm. et son diamètre extérieur de 80 mm. Il est ainsi facile de faire varier la longueur de la spirale en vue de satisfaire un client devant introduire dans ses coulées une quantité très précise d'aluminium. Habituellement, le diamètre minimum de la spirale est égal à au moins trois fois le diamètre du fil constitutif.The winding of the spiral wire makes it possible to obtain a relatively large weight under a relatively small volume. Thus, for a 15 mm aluminum wire. in diameter, the weight of one meter of wire is 475 grams. The length of the spiral is 90 mm. and its outside diameter of 80 mm. It is thus easy to vary the length of the spiral in order to satisfy a customer having to introduce into his castings a very precise quantity of aluminum. Usually, the minimum diameter of the spiral is at least three times the diameter of the constituent wire.

Bien que l'exemple qui vient d'être donné se rapporte à la réalisation de doses d'aluminium de désoxydation, la présente invention peut être appliquée à tout métal ou autre matériau d'apport pouvant être élaboré sous forme de fil, notamment en vue de la réalisation d'alliages.Although the example which has just been given relates to the production of aluminum doses of deoxidation, the present invention can be applied to any metal or other filler material which can be produced in the form of wire, in particular for the production of alloys.

Claims (6)

1° Dose pour la métallurgie, caractérisée en ce qu'elle est constituée par une longueur déterminée de fil enroulé en spirale. 1 ° Dose for metallurgy, characterized in that it consists of a determined length of wire wound in a spiral. 2° Dose selon la revendication 1, caractérisée en ce que la spirale est à enveloppe cylindrique. 2 ° Dose according to claim 1, characterized in that the spiral is cylindrical envelope. 3° Dose selon la revendication 1, caractérisée en ce que la spirale est à enveloppe conique. 3 ° Dose according to claim 1, characterized in that the spiral is conical envelope. 4° Dose selon la revendication 1, caractérisée en ce que au moins l'une des extrêmités du fil est coudée. 4 ° Dose according to claim 1, characterized in that at least one of the ends of the wire is bent. 5° Dose selon l'une des revendications 1 ou 3, caractérisée en ce que la spirale est à spires jointives. 5. Dose according to one of claims 1 or 3, characterized in that the spiral has contiguous turns. 6° Dose selon la revendication 1, caractérisée en ce que pour la désoxydation de l'acier, le fil est un fil d'aluminium pur à au moins 99,5%. 6 ° Dose according to claim 1, characterized in that for the deoxidation of steel, the wire is a pure aluminum wire at least 99.5%.
EP92400278A 1991-02-06 1992-02-04 Metallurgical additive Expired - Lifetime EP0498712B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9101306A FR2672303B1 (en) 1991-02-06 1991-02-06 METALLURGICAL DOSE.
FR9101306 1991-02-06

Publications (2)

Publication Number Publication Date
EP0498712A1 true EP0498712A1 (en) 1992-08-12
EP0498712B1 EP0498712B1 (en) 1996-08-21

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EP92400278A Expired - Lifetime EP0498712B1 (en) 1991-02-06 1992-02-04 Metallurgical additive

Country Status (5)

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EP (1) EP0498712B1 (en)
AT (1) ATE141653T1 (en)
DE (1) DE69212855T2 (en)
ES (1) ES2093222T3 (en)
FR (1) FR2672303B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2008407A1 (en) * 1968-05-13 1970-01-23 Nippon Kokan Kk
LU66682A1 (en) * 1971-12-20 1973-02-19
EP0020307A1 (en) * 1979-04-27 1980-12-10 NUOVA ITALSIDER SpA Method for introducing deoxydizing-desulphurizing substances into a mass of liquid metals without the use of gaseous carriers, and cored spiral tube therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2008407A1 (en) * 1968-05-13 1970-01-23 Nippon Kokan Kk
LU66682A1 (en) * 1971-12-20 1973-02-19
EP0020307A1 (en) * 1979-04-27 1980-12-10 NUOVA ITALSIDER SpA Method for introducing deoxydizing-desulphurizing substances into a mass of liquid metals without the use of gaseous carriers, and cored spiral tube therefor

Also Published As

Publication number Publication date
FR2672303B1 (en) 1994-09-23
ES2093222T3 (en) 1996-12-16
DE69212855D1 (en) 1996-09-26
ATE141653T1 (en) 1996-09-15
FR2672303A1 (en) 1992-08-07
DE69212855T2 (en) 1997-03-27
EP0498712B1 (en) 1996-08-21

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