KR860003030Y1 - Dam of tundish - Google Patents

Abstract

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Description

Refractory Dam for Tundish

1 is a process chart of a continuous casting tundish.

2 is a cross-sectional view taken along line A-A of the present invention in FIG.

3 is a cross-sectional view of the fire resistant dam of the present invention.

4 is an exemplary view of a conventional built-up refractory dam.

* Explanation of symbols for main parts of the drawings

10: frame 11: recovery ring

12: anchor 13: gold needle

14: Castable

The present invention relates to a fireproof dam for tundish, which is a monolithic structure of a non-building steel structure.

Generally known continuous casting apparatus constructs several refractory dams in tundish and installs Immersion Nozzle to rectify molten steel flowing from ladle to separate non-metallic inclusions and slag accompanying molten steel from molten steel. Injection volume is controlled. However, refractory dams, which are built a lot of refractory in tundish, need to be discarded after only one use after construction as a dam because the life of refractory is short. There was a problem. That is, when the continuous refractory dam 5 in FIG. 4 is built into the tundish 2 of FIG. 1 and continuously cast, the molten steel 15 flowing from the ladle 1 is tundish 2. As a specific gravity through the molten steel flow hole (6 '), which falls on the Well Block (3) in the bottom of the secondary dam (5') and floats non-metallic inclusions and slag on the primary low dam (4). As it flowed, the non-metallic inclusions and slag remained separated and thus minimized from entering the mold 9. At this time, the secondary dam (5 ') is usually a refractories that have a problem that its life is discarded after a single use. In addition, the maintenance time at the time of disposal, as well as the construction time is delayed when re-building, there was a problem of cost increase due to the consumption of the refractory consumed each time re-building.

Therefore, a fireproof dam that is simple to build and dispose of is required, and a fireproof dam having a service life that can be used repeatedly for about five times without being disposed of after a company is needed.

The purpose of the present invention is to extend the service life of a single molded product that is simply installed without a refractory dam. In order to achieve the above object, the present invention is to form a structure in which the anchor is embedded in the castable while exposing the ring to the upper part while forming a trapezoidal body with a mixture of golden needles.

This will be described in detail based on the accompanying drawings.

The present invention achieves the same trapezoidal shape as that of the entire shape of the secondary dam 5 'constructed of a plurality of refractory materials as shown in the fourth diagram, and the entire bottom surface is made into the molten steel flow sphere 6.

In the present invention, the frame 10 is configured from the inside of the dam main body 5 so that the recovery ring 11 is exposed to the outside of the upper end as shown in the cross-sectional view of FIG. 2 and FIG. Two anchors 12 are welded.

At this time, the dam main body 5 is composed of a castable 14 mixed with a plurality of gold needles (13).

In particular, when the castable 14 and the frame 10 are combined, the thermal expansion difference between the frame, the anchor, and the refractory becomes about twice (1.5 × 10 ° C.-0.6 = 10 / ° C. = 0.9 × 10 / ° C.). Therefore, if this is not corrected, a crack will occur.

Therefore, in order to compensate for this, by winding a 3mm thick cotton tape, the cotton tape is extinguished by heat to form a space between the frame and the anchor and the refractory to offset the thermal expansion difference. In addition, in order to minimize such thermal expansion, an aqueous paint is coated on the cotton tape and an alumina powder is applied. This is because the thermal conductivity is the best iron, followed by alumina and refractory, thereby suppressing the occurrence of cracks in the refractory due to the rapid expansion of the iron with the highest thermal conductivity.

Unexplained reference numeral 7 is an anti-damage dam, and 8 is an immersion nozzle. The present invention configured as described above is used by inserting and installing the refractory dam (5) in place of the existing built secondary secondary dam (5 ').

Therefore, the molten steel flows through the molten steel flow hole 6, and the non-metallic inclusions and slag are separated from the now-prevented dam 7 and remain.

At this time, after the outflow of molten steel, the hook 11 can be easily lifted to remove the current buried at a certain height of the bottom of the dam main body 5 so that it can be quickly returned to its original position after repair. Will be.

In addition, the present invention is a single mixture of the gold needle 13 and the castable 14, so that the fire resistance is improved to be used repeatedly 5 to 6 times. As such, the present invention provides a molten steel outlet on the bottom by constructing a small refractory brick, thereby improving the problems such as prolonged construction time and impossibility of reuse, delayed disposal time, and the like. Of course, it is effective to extend the life of the refractory dam.

Claims (1)

The trapezoidal dam main body 5 mixed with the metal needle 13 and the castable 14 and the anchor 12 are integrally formed in the main body 5, and the outer ring of the main body 5 has two rings ( A refractory dam for tundish, consisting of a frame 10 appearing as 11).