KR20110103150A

KR20110103150A - Tundish structure

Info

Publication number: KR20110103150A
Application number: KR1020100022337A
Authority: KR
Inventors: 김영안; 김정근
Original assignee: (주)인영
Priority date: 2010-03-12
Filing date: 2010-03-12
Publication date: 2011-09-20

Abstract

The present invention relates to a tundish structure having an improved structure to extend the life of the tundish by improving the refractory structure of the tundish corresponding to the area where the slag layer is located.
The structure is a tundish consisting of a refractory edible member, which is a refractory, in the interior of the shell frame arranged on the outside, and is formed to have a stepped portion at the upper inner portion of the inner wall of the tundish and to have a plurality of layers at the stepped portion. It has a structure in which the lead member is arranged.
According to the present invention, the present invention has a useful effect of extending the replacement and use period by extending the tundish life by reinforcing the slag layer erosion site of the tundish by a simple structure.

Description

Tundish struct {TUNDISH STRUCTURE}

The present invention relates to a tundish structure, and in particular to improve the tundish upper structure in which the slag layer of molten steel is located to extend the life of the tundish, as well as to improve the productivity of the operation.

In general, the tundish corresponds to an intermediate container that receives molten steel injected from a ladle in a continuous casting operation and injects the molten steel into a mold.

The structure of the tundish is composed of a shell frame forming a large shell and a refractory provided inside the shell frame.

Conventional tundish is provided to move the ladle pouring the molten steel on the upper side of the tundish, the lower end is connected to the mold for injection of the molten steel.

The tundish is built on the inner surface of the steel frame to form a refractory edible member, a kind of refractory, and the bottom surface is provided with an immersion nozzle for discharging the mold side of the molten steel. In addition, the refractory coating material is applied to the inner surface of the refractory brick of the tundish.

The present invention has been proposed in view of the above-mentioned problems, and an object thereof is to improve the upper rim structure of the tundish in which the slag layer is located when the molten steel is taken, thereby extending the life of the tundish refractory material. In addition, it is to provide a tundish structure that is composed of a simple structure that can reduce the cost relative to the maintenance work.

The present invention for achieving the above object is disposed so that the refractory mating member that is refractory on the bottom surface and the wall of the inside, and placed a steel frame of iron material on the outside of the refractory mating member,

A stepped part formed to have a stepped upper part inside the tundish;

It characterized in that it comprises a reinforcing edge member disposed on the stepped portion.

The stepped portion is formed in a shape that is wider than the other portion of the inner diameter on the inner upper portion of the refractory mating member.

The stepped portion is provided with a protrusion in which an upper portion of the shell frame protrudes outward.

The stepped portion further includes a support member connecting the lower surface of the protrusion and the outer surface of the steel frame.

The present invention is to improve the refractory structure of the tundish corresponding to the site where the slag layer is located to extend the life of the tundish, according to the present invention is composed of a simple structure erosion of the slag layer of the tundish Reinforcement of the site has a useful effect of extending tundish life to extend replacement and use cycles.

1 is a plan view showing a tundish employing a tundish structure according to the present invention in a plan view.
Figure 2 is a cross-sectional view taken along the line AA of Figure 1, schematically showing an embodiment of a tundish structure according to the present invention.
Figure 3 is a cross-sectional view showing another example of the reinforcement lead member of the present invention.
4 is a cross-sectional view schematically showing another embodiment of a tundish structure according to the present invention.
Figure 5 is a cross-sectional view showing a coupling structure of the upper edge member and the shell frame coupled to the step of the present invention.
6 is a front view showing the coupling portion of FIG.

The refractory structure of the tundish is arranged such that refractory kites and members are laminated on the inner bottom and walls, and an iron frame made of iron is disposed on the outer wall.

The open tundish having a rectangular cross-sectional structure with an open top performs a function of supplying molten steel to the mold side of the continuous casting equipment through the immersion nozzle after receiving the molten steel supplied from the ladle through the opened top.

However, in the tundish, after the molten steel is taken, the slag, which is an inclusion having a relatively low specific gravity, rises upward to form a high temperature slag layer.

The tundish is placed on the upper side of the tundish and is oxidized as it is in direct contact with the air, continually eroding the areas in contact with the inner walls of the tundish, so that the erosion site is relatively Compared with the weak point.

Not only is there a risk of safety accidents in the process of frequent repairs to areas eroded by slag layers, but there are also economic losses from interruption of operations and the cost of repairs.

Therefore, there is a demand for a tundish structure that can extend the lifespan by improving the upper structure of the tundish in which the slag layer is located.

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

The tundish structure according to the present invention will be described with reference to FIGS. 1 to 3, wherein the structure is a refractory edible member 14, which is a refractory material, is composed of a floor and a wall in an interior of a shell frame 12 disposed outside. The tundish 10 and the inner wall of the tundish 10 are formed to have the stepped portion 100 on the upper inner portion and have a structure in which the reinforcement connecting member 120 is disposed to have a plurality of layers on the stepped portion 100. .

In more detail, the configuration of the tundish 10 includes an outer steel frame 12 having an upper opening, and a fire-resistant duct member 14 which is disposed to be stacked on the inner side of the steel frame 12 and in which refractory is stacked. It is composed.

On the bottom surface of the tundish 10, a plurality of immersion nozzles for supplying molten steel to the mold side of the continuous casting facility are arranged to be spaced apart from each other.

The stepped part 100 is formed to have a wider inner diameter than the other part on the inner upper portion of the refractory mating member 14, and the reinforcement mating member 120 is disposed on the stepped part 100.

Hereinafter, the fire retardant member 14 constituting the stepped part 100 will be referred to as an 'upper twist member 110' so as to be distinguished from the other refractory twist member 14 on the lower side.

On the upper side of the refractory mating member 14, a support mating member 130, which is a refractory, is placed in a horizontal direction so that the lower part of the upper mating member 110 is seated and supports the top mating member 110.

In addition, the fireproof cover member 140 is disposed in the horizontal direction on the upper edge member 110.

That is, the upper duct member 110 is disposed on the outer side of the reinforcement duct member 120 disposed on the stepped part 100, and the shell frame 12 is disposed on the outer side of the upper duct member 110.

The reinforcement duct member 120 preferably adopts the same refractory as the upper duct member 110, but may also adopt other refractory materials.

The upper twist member 110 in which the reinforcement twist member 120 is disposed may have a straight or inclined surface according to the shape of the reinforcement twist member 120.

Figure 4 is a view showing another embodiment of the present invention, but having the same components as the above-described line embodiment, the upper portion of the shell frame 12 corresponding to the portion where the reinforcement connecting member 120 is disposed is extended outward It is to have a protruding part 200 to protrude.

This has a structure in which the protrusion 200 has a larger outer diameter than the outer diameter of the other steel frame 12.

As a result, the space of the stepped part 100 formed inwardly of the protrusion 200 is expanded, so that the reinforcement twisted member 120 may be disposed in multiple layers in addition to the upper edge member 110.

In addition, the protrusion 200 further includes a supporting member 210 having a lower surface connected to the steel frame 12.

The supporting member 210 has a plate shape, one end of which is fixed to the bottom surface of the protrusion 200, and the other end of the supporting member 210 is integrally coupled to the steel frame 12 positioned below the protrusion 200. .

Here, another embodiment of the present invention also has a configuration in which the reinforcement kite member 120 is disposed inside the stepped part 100, and the shell frame 12 is arranged outside the reinforcement kite member 120, as in the previous embodiment. Do.

Referring to the operation of the present invention having the above embodiments are as follows.

In the tundish structure according to the present invention, the stepped portion 100 is formed on the inner wall upper side of the tundish 10 in addition to the fire-resistant twisted member 14 and the shell frame 12 constituting the tundish 10, The reinforcing edge member 120 is disposed in the stepped portion 100.

As the stepped part 100 is formed inside the tundish 10, the reinforcement twisted member 120 may be disposed on the inner side surface of the upper twisted member 110.

At this time, the upper duct member 110 and the reinforcement duct member 120 may be integrally assembled via a refractory such as refractory cement.

5 and 6 is a view showing a coupling structure between the upper duct member 110 and the shell frame 12 of the present invention, the refractory duct member 14 may be integrated with the shell frame 12 and the plug welding method. .

The plug welding method is spot welded so that one end of the bolt member 310 is integrated inside the shell frame 12, and the other end is drilled to penetrate the upper edge member 110, and then around the other end and the hole. It can be proceeded in a manner of welding by filling with a weld (320).

As a result, the reinforcing edge member 120 is disposed on the upper side of the inner wall of the tundish 10.

After the molten steel is received in the tundish 10, the slag in the molten steel is raised to form a slag layer.

As the slag layer rises to the upper portion of the molten steel, the slag layer is positioned at the upper portion where the reinforcing edge member 120 is disposed.

Therefore, even if the slag layer of the molten steel is in contact with the inner surface of the reinforcement duct member 120, and the reinforcement duct member 120 in contact with the slag layer occurs an oxidation reaction, the erosion site is the reinforcement duct member 120 and the refractory duct member Since the 14 is disposed, it is possible to extend the life of the tundish 10 by extending the replacement period of the tundish 10 by erosion compared to the conventional.

In addition, when the protruding portion 200 is formed, the shell frame 12 and the upper edge member 110 and the plurality of layers of reinforcement edge member 120 can be disposed, so that the service life can be further extended. Have

Explanation of symbols on the main parts of the drawings
10: tundish 12: steel frame
14: refractory lead member 100: stepped portion
110: upper edge member 120: reinforced edge member
200: protrusion 210: support member

Claims

Refractory flame retardant member that is refractory is disposed on the bottom surface and the wall inside, and the steel frame made of iron material on the outside of the refractory flame retardant member,
A stepped part formed to have a stepped upper part inside the tundish;
Tundish structure characterized in that it comprises a reinforcement guiding member disposed in the stepped portion.

The method according to claim 1,
The stepped portion is a tundish structure, characterized in that formed on the inner upper portion of the refractory edible member is wider than other portions of the inner diameter.

The method according to claim 1 or 2,
The stepped portion is a tundish structure, characterized in that the upper portion of the projecting portion protruding outwardly formed.

The method according to claim 3,
The stepped portion is a tundish structure, characterized in that further comprising a support member for connecting the lower surface of the protrusion and the outer surface of the shell frame.