JP2521597Y2 - Continuous casting for continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a continuous casting tundish which is inexpensive and has excellent performance.

[Conventional technology]

The continuous casting tundish used in the continuous casting equipment is, as shown in FIG. 2, filled with molten steel M in a ladle 8 through a sliding nozzle 8a and a long nozzle 8b, and then by a dipping nozzle 6 and a stopper 7. The molten steel M of which the outflow amount has been adjusted is supplied into the continuous casting mold 9. In general, the backing material layer 2 is formed inside the can body 1 which forms the outer shell, and the inside thereof has an irregular shape. It has a structure in which the lining material layer 3 made of a material is formed.

As the lining method for this lining material, the spraying method of an amorphous material, the iron coating method, the fireproof insulation board method, etc. are often used, but recently, the dry amorphous material filling method that does not use water at all is also used. It is in practical use.

In this conventional dry type amorphous material filling method, as shown in FIG. 3, a dry type amorphous material using a thermosetting resin or the like as a binder is added to the gap between the backing layer 2 and the molding frame 4. This is a method of filling by shaking, and then curing the dry amorphous material by heating means to obtain the lining material layer 3. As shown in FIG. When the shape of 4 is similar, the thickness of the lining material layer 3 is constant. By the way, in general, the wear degree of the lining material layer 3 of the continuous casting tundish is larger in the upper slag line portion than in the lower steel bath portion, and there is a difference in the wear degree of both portions. However, the difference has a different aspect.

Therefore, in order to adapt to such a degree of wear of the lining material layer 3, a method of changing the wall thickness of the lining material layer 3 is more expensive than the backing material constituting the lining material layer 2 and is a dry type. This is desirable from the viewpoint of reducing the refractory unit consumption by reducing the amount of amorphous material used. As a solution to this, for example, the lining line layer 2 and the steel bath portion may have different shapes of the backing layer 2 as shown in FIG. A method of thickening the upper slag line portion, which has a greater degree of wear than the steel bath portion, by the molding die 4 having a constant shape is also implemented.

[Problems to be solved by the device]

In these conventional dry type amorphous material filling methods,
As shown in the figure, when the lining material layer 3 has a constant thickness, the heat insulation of the molten steel in the continuous casting tundish is excellent, but there is a drawback in that the basic unit of the lining material layer 3 increases and it becomes expensive. Further, as shown in FIG. 4, when the thickness of the lining material layer 3 is thicker in the upper slag line portion and thinner in the lower steel bath portion, it is possible to absorb the difference in the degree of wear occurring in both portions. The unit surface of the upholstery layer 3 is reduced from the former shown in FIG. 3,
They have the contradictory problems of poor heat insulation.

The present invention solves the drawbacks of the prior art that the basic unit of the lining material and the price and the heat insulating property cannot be satisfied at the same time, and it can be easily and dryly constructed by using various materials in the anhydrous state as cheaply as possible. Moreover, it is an object of the present invention to provide a tundish for continuous casting, which has a high corrosion resistance and a high thermal insulation performance by absorbing the difference in the degree of wear in the tundish during use, and which can extend the service life.

[Means for solving the problem]

As a result of earnest research to solve the above-mentioned problems, the inventors of the present invention have used a dry material using various materials in an anhydrous state, further inside the backing material layer formed inside the can of the continuous casting tundish. As a structure to be lined, a fireproof board of a special composition having a low thermal conductivity in an anhydrous state, which is preformed below the slag line portion when using this continuous casting tundish (hereinafter referred to as a high heat insulating board) is internally provided. , And the inside of the slag line part was formed by integrally molding a dry type amorphous filler layer from below to above the slag line part by vibrating and filling it with an amorphous material of a special composition in an anhydrous state. The present invention was completed by investigating the fact that the structure can solve the problem.

Hereinafter, the continuous casting tundish according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a tundish for continuous casting according to the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment, wherein 1 is a can body of continuous casting tan dash, 2 is a lining material layer formed inside the can body, 3 is a slag line portion further inside the lining material layer 2. Is a highly corrosion-resistant dry-type amorphous filler layer that is integrally formed from the lower part to the upper part of the steel and is in direct contact with molten steel and slag.
It consists of MgO as a main component, and other heat loss of Al ₂ O ₃ , SiO ₂ , CaO, and thermosetting resin that are cured by heating. Reference numeral 4 denotes a molding mold for forming the inner surface of the dry amorphous filler layer 3, and 5 is disposed below the slag line portion between the lining material layer 2 and the dry amorphous filler layer 3. A pre-formed, high-insulation board in an anhydrous state, which is embedded in
It is cheaper than the dry amorphous filler layer 3, has a small thermal conductivity, and has fire resistance in the temperature range to which the highly heat insulating board 5 itself is exposed, and its composition is mainly composed of SiO ₂ . In addition, it consists of Al ₂ O ₃ , CaO and a thermosetting resin such as a thermosetting resin such as a phenol resin used as a binder.

[Action]

The continuous casting tundish according to the present invention has an inner layer as shown in FIG. 1, and the upper part including the slag line part is the working layer consisting of only one layer of the dry amorphous filler layer 3. The lower part has a double layer of an operating layer consisting of a dry type amorphous filler layer 3 and a heat insulating layer consisting of a highly heat insulating board 5, thereby significantly reducing the amount of expensive dry type amorphous filler material used. Despite this, the amount of heat radiated from the side wall of the molten steel M in the continuous casting tandem can be significantly reduced.

Specifically, the backing material layer 2 having a thickness of the conditions shown in Table 1 is used.
The continuous heat dissipation index (Kcal / m ² hr) of natural convection in the steady state of the flat plate when the working layer consisting of the dry type amorphous filler layer 3 and the heat insulating layer consisting of the highly insulating board 5 are formed. Assuming that the molten steel temperature in the casting tundish is 1500 ° C., calculation is performed for the case of using the dry type amorphous filling material 3 and the highly heat insulating board 5 shown in Table 2, and the conventional example I
Comparing Fig. 3 with the present invention (Fig. 1), the heat dissipation index decreases by about 40% as shown in Table 1. Further, the cost index is lower than that of the conventional example II in which the thickness of the working layer made of the dry-type irregular filling material 3 is reduced to 5/6 without disposing the heat insulating layer made of the highly heat insulating board 5. It turns out that it is still excellent.

Note: The thermosetting resin as a binder during the burning loss of dry type amorphous filler is phenol resin, and the amount of phenol resin is half of the burning loss.

〔Example〕

In the continuous casting tank with a capacity of 15 Ton,
Using the materials shown in Table 2, lining was carried out as shown in FIG. That is, a 10 mm-thick, highly heat-insulating board 5 in an anhydrous state was attached to a lining material 2 of the steel bath portion below the slag line portion of the continuous casting tundish with a commercially available adhesive, and then the molding frame 4 was attached. After being set, the amorphous material or the like in the completely anhydrous state was oscillated and filled as it was and cured by heating to form a dry amorphous filler layer 3. The lining thickness was 20 mm as shown in Table 1. The upper part including the slag line has a construction thickness of 30 mm. About 770 Ton of molten stainless steel was cast by the continuous casting tank.

As a result, the outer wall temperature of the continuous casting tundish can body was about 100 ° C lower than that of the conventional example I (Fig. 2, Table 1), and there was no variation in the molten steel temperature in the continuous casting tundish to the low temperature side. Atsuta The amount of anhydrous amorphous material used as the lining material was reduced by about 22%, and the unit price index was reduced by about 15% even if the cost of highly insulating board material was added.

[Effect of device]

As described in detail above, the continuous casting tundish according to the present invention has, as the lining structure thereof, a thick layer of a dry type amorphous filler layer including the slag line portion, and a steel layer below the layer. The above-mentioned problems of the present invention have been solved by making the bath part a two-layer structure composed of a highly corrosion resistant amorphous filler layer integrated with the upper part and a highly heat insulating board, and are listed below. It has an effect and is of great practical value.

(A) Dry type and easy construction can be performed using various materials in anhydrous state. Therefore, there is no need to dry the water during construction, and there is no need to worry about cracking (damage) due to drying,
There is no need to worry about deterioration of the quality of the slab after continuous casting due to moisture.

(B) It has high corrosion resistance and high heat insulation performance by absorbing the difference in the degree of wear between the slag line portion and the steel bath portion in the continuous casting tundish, and can extend the service life of the tundish itself.

(C) The amount of heat dissipated from the side wall of the continuous casting tundish decreases, and as a result, the temperature of the continuous casting tundish bath steel can be prevented from lowering, its variation can be reduced, and the continuous casting tundish iron shell temperature can be prevented. Therefore, stable continuous casting becomes possible, and the quality of the slab can be improved.

(D) It is possible to reduce the basic unit, unit price and cost (yen / Ton) of the continuous casting lining material for continuous casting.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an embodiment of a continuous casting tundish according to the present invention, FIG. 2 is a view for explaining the use state of the continuous casting tundish, and FIGS. 3 and 4 are conventional continuous It is sectional drawing which shows the structure of the casting tundish. In the drawing 1 …… Canned tundish for continuous casting 2 …… Lining material layer 3 …… Dry type irregular filler layer 4 …… Forming mold 5 …… High heat insulating board 6 …… Immersion nozzle 7… … Stopper 8 …… Ladle 8a …… Sliding nozzle 8b …… Long nozzle 9 …… Continuous casting mold M …… Molten steel

Claims (2)

(57) [Scope of utility model registration request] 1. A SiO ₂ main component, which is further inside the backing material layer (2) formed inside the can body (1) of the continuous casting tundish and is below the slag line, and other Al ₂ O. ₃ ,
A pre-formed anhydrous highly insulating board (5) consisting of CaO and burning loss is placed, and further inside it.
The dry amorphous filler layer (3), which is mainly composed of MgO, is made of Al ₂ O ₃ , SiO ₂ , CaO, and thermosetting resin, is an amorphous amorphous material in an anhydrous state, and is heat-cured by vibration filling A continuous casting tundish which is integrally lined from the lower side to the upper side of the line portion. 2. The high thermal insulation board (5) has a thermal conductivity smaller than that of the dry amorphous filler layer (3).
The continuous casting tundish described in.