DE2922349A1 - FILLED METAL WIRE - Google Patents

Description

_ DR. SOLF & ZAPF

DR.-ING. DIPL.-ING. A. SOLF DIPL.-1NG. CHR. ZAPF

Wall 27/29 56OO Wuppertal 1 P.O. Box 13O219

Il / ko / 1410

ARBED S.A., avenue de la Liberte, Luxembourg

"Filled metal wire"

030009/0606

The present invention relates to an introducer Filled metal wire suitable for additives in metal baths.

Among the numerous methods of introducing treatment or alloying additives into metal baths, the use of wires including the additive has proven effective, albeit expensive.

So it is known according to DT-PS 974.835, metallic Enclose deoxidizing agents such as Al, Ca, Ti, Mg, as well as alkali or alkaline earth metals in metal shells and to introduce the latter into metal baths in certain quantities.

The DT-AS 1.953.410 describes the · introduction of a Metal wire consisting of a core made of Fe, Al, Cr, Ni, Mo, Mg, Ti and their alloys, as well as a sheath, the various Contains additives in powder or granulate form, which are solidified by means of an organic binder. The use of such a composite wire allows deoxidation with an alloying measure connect to.

The procedures for introducing treatment or alloy additives into metal baths by means of filled wires, who can understand on the one hand a shell and the addition and on the other hand a shell, the addition and a metal core, however, they have problems of a technological nature. So.

Depending on the type of production of the filled wire, there is a risk of leakage or decomposition of the Cover located accessory.

In order to expand the actually satisfactory method for introducing additives by means of filled Wires to achieve other metallurgical processes, such as the treatment of metal baths with mixtures of "rare." Erden "(Ce, Pr, Nd), one must have means at their disposal which on the one hand prevent the expensive mixture in the course its sheath is oxidized and, on the other hand, allow the filled wire produced to be stored without decomposition phenomena occur, which easily occur under the conditions prevailing in steelworks.

The known filled wires, which are designed with a view to sealing, have certain disadvantages,

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namely either too thick a thickness of the shell compared to the diameter of the interior, or in the opposite case, the need to seal the envelope by welding.

With the first execution, a problem-free winding and unwinding of the filled wire is not guaranteed; Further one is forced to make very long wires to accommodate relatively small amounts of additives. The second execution is with the risk of irreversible decomposition of the additional material with the heat generated by welding afflicted.

The aim of the invention is therefore to propose a closed filled wire that has a large Has relationship between the volume of the interior and that of the shell.

This goal is achieved by the invention Wire, which essentially comprises a metallic sheath, consisting of a thin band, the edges of which are so bent, that a noticeably circular profile is created, as well as an additive that is enclosed in said cover, thereby characterized in that within the envelope there is a band of lesser thickness than that of the envelope, its bent over Edges touch the inside surface of the sleeve, covering the addition so that the center line of the tape is aligned is noticeably below the area in which the envelope edges are located to encounter.

According to a first embodiment, the envelope edges held together by the pressure applied during molding.

The advantage of this embodiment is that that in the case of heat-sensitive additives, there is a need for welding the hull edges can do without. Indeed, the tape prevents the additive from leaking and seals the Wire off, in spite of the bends the wire is subjected to during handling.

Another advantage offered by the tape is that it eliminates the multiple pulling operations required to manufacture conventional filled wires; can be omitted. ι

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Finally, thanks to the presence of the tape, the binders and adhesives previously required to fix the additive, which fill the space and are difficult to introduce into the envelope, are also dispensed with.
A second embodiment of the wire according to the invention provides that the casing edges are welded to one another.

In this case, which is useful for extremely thin casings and additives that are highly sensitive to atmospheric oxygen When it comes to the question, is it again the tape that enables the edges of the envelope to be welded together without the edges protected by the tape Leak additive that can interfere with the weld or decompose. The filled wire with welded envelope edges can be stored for a long time without any problems and this despite the unfavorable conditions that prevail in a steel mill warehouse can.

According to the invention, the tape used to cover the additive can form an approximately semicircular profile. It can also have a central deflection oriented towards the middle of the wire; this in particular in the case of welded designs.

Thanks to this embodiment, possible drawing processes, winding and unwinding, welding, etc. are carried out without the risk of a local leak, because the tape also forms a second half-shell and any deflection that may be present represents a kind of safety reserve that enhances flexibility and ductility of the filled wire increased.

Thanks to these features, a wide variety of additives can be used within the filled wire according to the invention ■ are included, such as deoxidants, carburizing agents, Desulphurizing agents or alloy additives.

Furthermore, the filled according to the invention In addition to the addition of a wire, grasp a central metal wire. The latter can be made from an alloy metal or from consist of a deoxidizer and are straight or spiral.

The drawings serve for a graphic, non-restrictive explanation of the filled wire according to the invention.

030009/0608

Show it:

1 shows a cross section through a first embodiment of the filled wire and FIG. 2 shows a cross section through a further embodiment.

Fig. 1 shows the metallic shell (1), the edges (la and Ib) touch. The band (2), which is thinner than the sheath (1) and has a semicircular shape, covers the addition (3).

Fig. 2 shows the embodiment in which the envelope edges (la and Ib) are welded together. The band (2) has the central deflection (4) oriented towards the inside of the wire, which avoids the risks that occur during welding. The central metal wire (5) can also be seen, the presence of which may be appropriate depending on the metallurgical requirements.

For metallurgical test purposes, a filled wire with an outside diameter of 12 mm was produced. The envelope thickness was 0.5 mm and the tape thickness 0.2 mm. This wire contained about 150 g calcium silicon per running meter.

For the planned metallurgical test, 150 kg of additive, i.e. 1 kg / Ton of steel entered. You therefore needed 1000 m of filled wire.

■ These 1000 m were driven at a speed of 2 m / sec. introduced into the bathroom, a total of about 9 minutes and represents an addition of additive of about 300 g / sec or 1.8 kg / min.

The introduction of the wire was not accompanied by any undesirable reaction, such as a smoke development could express; the powder therefore reacted satisfactorily with the liquid steel. Next was that The addition time is relatively short and the temperature drop in the bath is negligible.

The expected metallurgical effects, namely a reduction in the oxygen and sulfur content, could can be fully achieved.

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Claims (8)

2322349 -X- claims 1. Suitable for introducing additives into metal baths filled metal wire, which essentially comprises a metallic sheath consisting of a thin band, the edges of which are bent so that a noticeably circular profile is created, as well as an addition, which in said Sheath is enclosed, characterized in that it is located within the sheath (1) a band (2) of lesser thickness than that of the envelope (Τ) is located, the bent edges of which the inner surface touch the shell and that covers the addition (3) so that the center line of the band (2) is noticeably below of the area in which the envelope edges (1a, 1b) meet. 2. Filled wire according to claim 1, characterized in that the adjacent Shell edges (1a, 1b) are held together by the pressure applied during shaping. 3. Filled wire according to claim 1, characterized in that g e k ennzei chnet that the casing edges (1a, 1b) lying next to one another are welded to one another. 4. Filled wire according to one or more of claims 1 to 3, characterized in that that the band (2) has a central, lengthwise, to the middle of the wire has oriented deflection (4). 5. Filled wire according to one or more of claims 1 to 4, characterized in that that the additive (3) is a deoxidizer, a carburizing agent, a desulfurizing agent or an alloy additive is. 030009/0606 -X- 2B22349 6. Filled wire according to one or more of claims 1 to 5, characterized in that that he understands in addition to the addition (3) a central metallic wire (5) made of an alloy metal or consists of a deoxidizer. 7. Filled wire according to claim 6, characterized in that the central metal wire (5) is straight.
10 8. Filled wire according to claim 6, characterized in that the central metal wire (5) has a spiral shape. 030009/0806