KR200307661Y1 - Tundish upper nozzle for anti-sticking type of interposition material - Google Patents

Abstract

The present invention maintains a constant back end pressure of argon (Ar) injected into an upper nozzle of a tundish, which is a facility used in a performance factory during the steelmaking process, and now or inside the upper nozzle during casting. The present invention relates to an intervention anti-tachable top dish nozzle for preventing the attachment of inclusions in molten steel.

The present invention is composed of a high temperature resistant refractory 52, the outside of the refractory 52 is wrapped in a metal case 54, the argon (Ar) injected through the argon inlet (56) and the refractory 52 In the upper nozzle 50 of the tundish forming the argon pool 58 between the metal cases 54, grooves 52-2 are formed in the refractory 52 opposite the argon inlet 56. In addition, all the positions of the argon pool 58 except for the groove 52-2 are sealed.

As the rear end pressure of argon (Ar) is kept constant at the limited argon (Ar) flow rate by the construction and operation of the present invention as described above, clogging of the upper nozzle is prevented by adhesion of now or impurity inclusions to the inner wall of the upper nozzle. This eliminates the problem, thereby smoothing the casting operation, and provides an effect of reducing the occurrence of melting or cracking.

Description

TUNCH UPPER NOZZLE FOR ANTI-STICKING TYPE OF INTERPOSITION MATERIAL}

The present invention relates to an intervening anti-twirl upper nozzle, in particular, a constant end pressure of argon (Ar) injected into an upper nozzle of a tundish, a facility used in a performance factory during a steelmaking process. It relates to an intervening anti-stick tish upper nozzle which can be maintained so as to prevent the inclusion of the inclusion in the upper nozzle during the casting operation now or in the molten steel.

1 is a schematic diagram showing a playing process and a position diagram of the tundish nozzle 20, FIG. 2 is a configuration diagram of the tundish nozzle, and FIG. 3 is a schematic diagram of a conventional tundish upper nozzle.

4A and 4B are schematic diagrams for explaining a nozzle clogging phenomenon of a conventional tundish upper nozzle according to continuous casting. In general, the upper nozzle 22 of the tundish 10 is a molten steel in the tundish 10. 12 is located in the path of travel into the mold 14. Therefore, the upper nozzle 22 should not be solidified on the inner wall of the molten steel 12 or the inclusions in the molten steel 12 to be attached to the inner wall so that the molten steel 12 passing through this portion can move smoothly. There must be a property to withstand the molten steel (12).

Therefore, the upper nozzle 22 is composed of a porous refractory (22-3) that can withstand high temperatures, and to prevent the adhesion of now and other inclusions on its inner wall (22-) The outside of 3) is wrapped in a metal case 22-4, spaced between the refractory 22-3 and the metal case 22-4, and then the metal case 22-4. When argon (Ar) is injected through the argon inlet (22-6) of the injected argon (Ar) between the metal case (22-4) and the gap (Gap) of the refractory (22-3) Pool (Pool) 22-5 are designed to be formed.

However, argon (Ar) injected into the upper nozzle 22 through the metal case 22-4 during casting has a refractory 22-3 in the inner wall of the upper nozzle 22. It is injected into the mold 14 by the flow of the molten steel 12 while preventing direct contact with impurities in the part. When a large flow rate of argon (Ar) is used, some of the argon (Ar) injected into the mold 14 is molded. The flow rate of argon (Ar) injected into the upper nozzle 22 is limited as it does not float to the upper side of 14 and coagulates with the molten steel 12 to generate a bubble defect in the final product.

Therefore, the argon (Ar) injected into the upper nozzle 22 has two management methods of flow control or constant back pressure, but in the case of a curved type player, the argon (Ar) has a constant defect due to the occurrence of argon (Ar). Since argon (Ar) can not be injected in a large amount, the argon (Ar) flow control method is applied.

Accordingly, due to the limited argon (Ar) flow rate, the effect of preventing the adhesion of the molten steel 12 or other impurity inclusions on the inner wall of the upper nozzle 22 is insufficient. As the casting time elapses (after the middle of casting), the inner wall of the upper nozzle 22 is reduced. The adhesion of impurity inclusions now or is increased resulting in the impossibility of casting due to complete clogging of the upper nozzle 22.

That is, as shown in FIG. 4A, in the initial stage of casting, the rear end pressure of argon (Ar) coming out while pushing the molten steel from the argon tank 30 by constantly receiving iron static pressure by molten steel in which the entire inner wall of the upper nozzle 22 descends. Argon (Ar), which is kept constant and exits the pores 22-3-1 of the upper nozzle 22, pushes the molten steel of the inner wall of the upper nozzle 22 to prevent inclusions between the refractory 22-3 and the molten steel. Although the initial argon (Ar) pressure is not high enough, the nozzle clogging occurs as the casting proceeds.

In addition, as shown in FIG. 4B, after the middle of casting, in which the soft water is increased, the pressure caused by the molten steel is increased to the surface of the refractory 22-3 of the upper nozzle 22 by the inclusion of inclusions and inclusions. Partial action (area not subjected to iron static pressure of molten steel) causes the rear end pressure of argon (Drop) to drop, so that the force by the pressure to push the molten steel of the inner wall of the upper nozzle 22 does not work. There was a problem that the melt or crack (22-8), etc. caused by the clogging of the nozzle is accelerated, the reference numeral 16 is a shroud nozzle, 22-1 is the upper plate, 22-2 is the lower plate, 22-7 Silver Molten Steel, 24 lower nozzle, 26 immersion nozzle, 32 flow meter, 34 pressure gauge.

The present invention was devised to solve the problems of the prior art, and even if a limited amount of argon (Ar) is injected into the upper nozzle, the pressure applied to the rear end of the argon (Ar) is kept constant according to the passage of the casting time. An object of the present invention is to provide an interposition-attached turn-dish upper nozzle that can prevent clogging of the upper nozzle.

1 is a schematic view showing a playing process and a position diagram of a tundish nozzle,

2 is a configuration diagram of a tundish nozzle,

3 is a schematic view of a conventional tundish upper nozzle,

Figure 4a is a schematic view for explaining the nozzle clogging phenomenon of the conventional tundish upper nozzle in the early stage of continuous casting,

Figure 4b is a schematic diagram for explaining the acceleration phenomenon of the nozzle clogging phenomenon of the conventional tundish upper nozzle after the middle of continuous casting,

Figure 5 is a schematic diagram of the inclusion preventive turn dish upper nozzle according to the present invention.

<Description of the symbols for the main parts of the drawings>

50: upper nozzle 52: refractory

52-2: groove 54: metal case

56: argon inlet 58: argon pool

59: sealing

In order to achieve the above object, it is composed of a high temperature resistant refractory, and the outside of the refractory is wrapped in a metal case, and argon (Ar) injected through an argon inlet forms an argon pool between the refractory and the metal case. In the upper nozzle of the tundish, grooves are formed in the refractory facing the argon inlet, and all the portions of the argon pool except for the grooves are sealed to provide an anti-stick insert-type turn dish upper nozzle. .

Hereinafter, the present invention will be described in more detail with reference to the drawings showing preferred embodiments.

Figure 5 shows an embodiment of the anti-intervention turn-dish upper nozzle according to the present invention, the turn dish upper nozzle is composed of a high temperature resistant refractory 52, the outside of the refractory 52 is a metal case The upper nozzle 50 of the tundish, which is packaged with the 54 and the argon (Ar) injected through the argon inlet (56) forms the argon pool (58) between the refractory (52) and the metal case (54). ), A groove 52-2 is formed in the refractory 52 opposite to the argon injection hole 56 so that argon (Ar) can move, and the argon pool 58 except for the groove 52-2 is formed. ) Is completely configured to maintain a constant pressure applied to the rear end of the argon (Ar) injected by the closing treatment (59).

Hereinafter, the operation of the present invention having the configuration as described above.

The relationship between the flow rate of argon (Ar) injected into the upper nozzle 50 and the rear end pressure may be expressed by the following equation.

Argon's trailing pressure ∝

Here, the volume of the flow passage means an argon pool (58).

As can be seen from the above equation, at the same argon (Ar) flow rate, the rear end pressure of argon (Ar) injected by minimizing the argon pool 58 can be maintained high.

Therefore, as shown in FIG. 5, argon (Ar) is normally supplied through the argon inlet (56) and the groove (52-2) of the refractory body (52) by the present invention, and the refractory of the upper nozzle (50). Since the space between the 52 and the metal case 54 is completely sealed except for the groove 52-2 through which the argon (Ar) is supplied, the area of the argon pool 58 is reduced. As a result, a higher rear end pressure of argon (Ar) may be maintained under the same argon (Ar) injection conditions, and accordingly, the upper nozzle 50 may be increased by a force corresponding to a pressure to push the molten steel of the inner wall of the upper nozzle 50. Clogging can be eliminated.

As described above, according to the present invention, the rear end pressure of argon (Ar) is kept constant at a limited argon (Ar) flow rate, thereby preventing clogging of the upper nozzle by preventing adhesion of impurities or impurities to the inner wall of the upper nozzle. As a result, the casting operation is smooth and there is an effect of reducing the occurrence of melting or cracking.

In the above description, the technical concept of the interposition-attached turn-dish upper nozzle according to the present invention has been described together with the accompanying drawings. However, this is illustrative of the preferred embodiment of the present invention and is not intended to limit the present invention.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (1)

It is composed of a high temperature resistant refractory 52, the outside of the refractory 52 is wrapped in a metal case 54, the argon (Ar) injected through the argon inlet 56 is the refractory 52 and the metal case ( In the upper nozzle 50 of the tundish forming the argon pool 58 between 54, The groove 52-2 is formed in the refractory body 52 which opposes the argon injection hole 56, and all the positions of the argon pool 58 except for the groove 52-2 are sealed 59. Interstitial anti-stick turn-nose nozzle, characterized in that.