KR101175621B1

KR101175621B1 - Ladle and construction method of refractories for ladle

Info

Publication number: KR101175621B1
Application number: KR1020100073264A
Authority: KR
Inventors: 이만식; 최홍성
Original assignee: 현대제철 주식회사
Priority date: 2010-07-29
Filing date: 2010-07-29
Publication date: 2012-08-21
Also published as: KR20120021386A

Abstract

According to the present invention, a shell made of a wall and a floor, a first refractory disposed to cover the floor, and a portion adjacent the first refractory are disposed so as to define an accommodating space of the molten steel. A ladle and a ladle refractories method of building, comprising a second refractory, which is constructed with a thinner lead.

Description

LADLE AND CONSTRUCTION METHOD OF REFRACTORIES FOR LADLE}

The present invention relates to a refractory structure of a ladle for receiving molten steel in a steelmaking furnace and supplying it to a tundish during a continuous casting process, and a method of manufacturing the same.

In general, a continuous casting machine is a facility for producing slabs of a constant size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it as a mold for a continuous casting machine.

The continuous casting machine includes a ladle for storing molten steel, a continuous casting machine mold for cooling the tundish and the molten steel discharged from the tundish to form a casting having a predetermined shape, and a casting formed in the mold connected to the mold. It includes a plurality of pinch roller to move.

In other words, the molten steel tapping out of the ladle and tundish is formed of a slab (Slab) or bloom (Bloom), billet (Billet), etc. having a predetermined width and thickness in the mold is transferred to the next process.

It is an object of the present invention to provide a ladle and a method of constructing a ladle refractories in which only the necessary parts can be replaced when the refractory of the ladle wall is replaced.

Ladle according to an embodiment of the present invention for realizing the above object, the outer shell consisting of a wall and the floor, the first refractory disposed to cover the floor and the wall to surround the receiving space of the molten steel, The portion adjacent to the first refractory may include a second refractory, which is constructed with a lean thinner than the other portion.

It is disposed on the upper side of the first refractory, and may include a third refractory formed corresponding to the bottom of the shell.

The first refractory may include an amorphous refractory.

It may comprise a reinforcing refractory, which is filled in the gap between the second and third refractory.

The portion of the second refractory adjacent to the first refractory may include a portion partially exposed over the reinforcement refractory.

Ladle refractory construction method according to an embodiment of the present invention for realizing the above object, the step of building a permanent field on the bottom and the wall of the shell, and the first refractory on the upper side of the permanent field corresponding to the floor Constructing a second refractories lower end portion by stacking a thin layer of thin confectionery in a portion adjacent to the first refractories so as to surround the wall, and forming a second refractory lower end portion; It may comprise the step of finishing the second refractory construction by stacking the thicker than the second edge of the second refractory of the refractory.

Building a third refractory along the top of the first refractory, in a portion corresponding to the bottom.

Filling a reinforcement refractory in the gap between the second refractory and the third refractory.

The reinforcement refractory may include the same material as the first refractory.

The second refractory and the third refractory may include a material having greater corrosion resistance and abrasion resistance than the first refractory.

The first refractory may include a castable.

According to the ladle and ladle refractories construction method according to the present invention configured as described above, when replacing the refractory of the ladle wall, it is possible to selectively replace only the necessary portion has the effect of reducing unnecessary refractory consumption.

1 is a conceptual diagram for explaining a continuous casting machine mainly on the flow of molten steel (M).
2 is a cross-sectional view schematically showing the configuration of a ladle 10 according to an embodiment of the present invention.
3 is a flowchart illustrating a method of constructing a ladle refractory according to an embodiment of the present invention.

Hereinafter, a ladle and a ladle refractories construction method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar configurations, and the description thereof is replaced with the first description.

1 is a conceptual diagram for explaining a continuous casting machine mainly on the flow of molten steel (M).

Referring to this figure, the molten steel (M) is to flow to the tundish 20 in the state accommodated in the ladle (10). For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends to be immersed in the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrided. The case where molten steel M is exposed to air due to breakage of shroud nozzle 15 is called open casting.

The molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 corresponding to the immersion nozzle 25. Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25. Control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method, which is different from the stopper method. The slide gate controls the discharge flow rate of the molten steel M through the immersion nozzle 25 while the sheet material slides in the horizontal direction in the tundish 20.

The molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface of the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M. The rear portion along the casting direction of the strand 80 is formed by the non-solidified molten steel 82 being wrapped around the solidified shell 81 in which the molten steel M is solidified by the method in which the peripheral portion first solidifies.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the fully solidified strand 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The uncondensed molten steel 82 is cooled by the spray 65 for spraying cooling water in the course of the above movement. This causes the thickness of the uncooled steel (82) in the strand (80) to gradually decrease. When the strand 80 reaches a point 85, the strand 80 is filled with the solidification shell 81 in its entire thickness. The solidified strand 80 is cut to a predetermined size at the cutting point 91 and divided into a product P such as a slab.

2 is a cross-sectional view schematically showing the configuration of a ladle 10 according to an embodiment of the present invention.

Referring to the figure, the ladle 10 may include a shell 100, a permanent field 200, a first refractory 300, a second refractory 400, and a third refractory 500. have.

The outer shell 100 forms an outer shape of the ladle 10 and may be formed of a steel sheet or the like. Outer shell 100 may be of a shape that can contain the molten steel (M) made of a wall and the bottom.

Permanent field 200 may be a refractory formed along the inner surface of the shell (100). The permanent field 200 not only serves to protect the outer shell 100, but may also be a heat resistant material that can withstand high temperatures by preventing molten steel (M) from flowing out. Permanent field 200 may be in the form of refractory lead that is built along the inner surface of the shell (100). Permanent field 200 is preferably built on both the bottom and the inner wall surface for the protection of the shell (100).

The first refractory 300 may be formed along the inner surface of the permanent field 200 formed on the bottom of the ladle 10. The first refractory 300 may be an amorphous refractory formed at the bottom of the ladle 10. The first refractory 300 may be formed to cover the entire bottom of the ladle 10. The edge portion of the first refractory 300 constructed to contact the wall of the ladle 10 may be shaped to surround the wall of the shell 100 by the height of the building. The first refractory 300 is to protect the permanent field 200 of the floor, and serves to absorb the impact applied to the floor when the molten steel (M) is accommodated in the ladle (10). Therefore, the first refractory 300 may be a material having excellent impact resistance. In detail, the first refractory 300 may be castable.

The second refractory 400 may be formed along the inner surface of the permanent field 200 formed on the wall of the ladle 10. The second refractory 400 may be a refractory soft wire that is constructed to surround and protect the permanent field 200 formed on the wall of the ladle 10. The second refractory lower end 400a is a portion adjacent to the upper end of the first refractory 300. The second refractory lower end portion 400a may be constructed with a softer thinner than the rest of the second refractory 400. The inner side surface of the second refractory lower end 400a may be in contact with the reinforcement refractory 300a. A portion of the second refractory lower end 400a may be exposed to the inner space of the ladle 10. Specifically, a portion of the upper end of the second refractory lower end portion 400a not wrapped in the reinforcement refractory 300a may be exposed to the inner space of the ladle 10. Since the second refractory 400 contacts the molten steel M, the second refractory 400 may be a material having superior corrosion resistance and wear resistance than the permanent field 200. The second refractory 400 may include alumina or a material including magnesia. The second refractory 400 and the second refractory lower end 400a may be made of the same material. In contrast, the lower end portion 400a of the second refractory may be made of a material having better corrosion resistance and wear resistance than the second refractory 400. Description of the reinforcement refractory 300a will be described in detail below.

The third refractory 500 may be disposed above the first refractory 300. The third refractory 500 may be formed to correspond to the bottom of the shell (100). Specifically, the third refractory 500 may be a refractory soft wire that is constructed to cover the upper end of the first refractory 300 to contact the first refractory 300. Since the third refractory 500 is in contact with the molten steel M, heat resistance, erosion resistance, and wear resistance may be superior to those of the first refractory 300. The third refractory 500 may include alumina or a material including magnesia. The third refractory 500 may be formed to be spaced apart from the lower end portion 400a of the second refractory. As such, the reinforcement refractory 300a may be filled in the gap formed between the third refractory 500 and the lower end portion 400a of the second refractory. The reinforcement refractory 300a may be an amorphous refractory. The reinforcement refractory 300a may be made of the same material as the first refractory 300. Specifically, the reinforcement refractory 300a may be castable.

3 is a flowchart illustrating a method of constructing a ladle refractory according to an embodiment of the present invention.

Referring to this figure, the permanent field 200 is built on the inner bottom and walls of the outer shell 100 of the ladle 10 (S10). Permanent field 200 may be a brick-shaped smoke. Permanent field 200 may be formed by constructing the edema on the entire bottom and wall of the inner surface of the shell (100).

Next, the first refractory 300 is stacked on the upper side of the permanent field 200 constructed in the bottom portion of the shell 100 (S20). The first refractory 300 may be an irregular refractory formed to contact the permanent field 200 on the upper side of the permanent field 200. Specifically, the first refractory 300 may be castable. The first refractory 300 may be formed by pouring a castable on the bottom portion of the ladle 10 in which the permanent field 200 is constructed.

Next, the second refractory lower end portion 400a is first formed at a portion adjacent to the first refractory 300 to cover the wall of the shell 100 while being in contact with the first refractory 300 (S30). The second refractory lower end 400a is constructed to abut on the inner surface of the permanent field 200 constructed along the wall of the shell 100. The lower end portion 400a of the second refractory may use a lead thinner than the remaining portion of the second refractory 400. When the construction of the second refractory lower end 400a is finished, the second refractory 400 is constructed so as to cover the wall of the shell 100 by stacking a thicker thickness than the second refractory lower end 400a so as to contact thereon. (S40). Specifically, the second refractory lower end portion (400a) is stacked to stack three sheets of thinner than the other portion, the thicker than the stack thicker than that to build a wall so as to wrap the wall of the shell (100). The second refractory 400 may be a material having greater corrosion resistance and wear resistance than the first refractory 300. For example, the second refractory 400 may include alumina material or magnesia material.

Next, the third refractory 500 may be constructed along the upper end of the first refractory 300 at a portion corresponding to the bottom of the shell 100. When the construction of the first refractory 300 is completed, the third refractory 500 may be constructed to contact the first refractory 300 on an upper side of the portion corresponding to the bottom of the ladle 10. The third refractory 500 may be a material having greater corrosion resistance and wear resistance than the first refractory 300. In detail, the third refractory 500 may include an alumina material or a magnesia material. Since the third refractory 500 is in the form of a lead, it may be difficult to completely contact the second refractory 400 formed on the wall of the ladle 10. Therefore, a gap may occur between the second refractory 400 and the third refractory 500. This gap may be filled with reinforcement refractory 300a. The reinforcement refractory 300a may be an amorphous refractory, and specifically, may be castable. The reinforcement refractory 300a may have the same characteristics as the same material as the first refractory 300. Some of the edges of the second refractory lower end 400a may be exposed to the upper side of the reinforcement refractory 300a formed in the gap between the second refractory 400 and the third refractory 500. In detail, the kite located at the top of the kite forming the lower end portion 300a of the second refractory may be partially exposed to the reinforcing refractory 300a to be in contact with the molten steel (M). The kites located at the bottom of the kites forming the second refractory bottom portion 400a may be protected in a form completely wrapped by the reinforcement refractory 300a.

Such ladle and ladle refractories construction method is not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: ladle 15: shroud nozzle
20: tundish 21: stopper
25: immersion nozzle 30: mold
65: spray 70: pinch roll
80: strand 81: solidified shell
82: unsolidified molten steel 85: solidification completion point
91: cutting point 100: sheath
200: permanent field 300: first refractory
300a: reinforcing refractory 400: second refractory
400a: second refractory lower portion 500: third refractory
P: Product M: Molten Steel

Claims

A sheath consisting of walls and floors to define the receiving space of the molten steel;
A first refractory disposed to cover the bottom;
A second refractory disposed to surround the wall, wherein a portion adjacent to the first refractories is constructed with a lead thinner than another portion;
A third refractory body disposed above the first refractory body and configured of a lead formed apart from a lower end portion of the second refractory body at a predetermined interval; And
Ladle comprising a; reinforcing refractory is filled in the gap between the lower end of the second refractory and the third refractory.

delete

The method of claim 1,
The ladle, wherein the first refractory includes an amorphous refractory.

delete

The method of claim 1,
Wherein the portion of the second refractory adjacent to the first refractory includes a portion exposed over the reinforcement refractory.

Constructing a permanent field in the bottom and walls of the shell;
Stacking a first refractory on an upper side of the permanent field corresponding to the bottom;
Constructing a second refractory lower end part by stacking a thin thickness of the soft confectionery in a portion adjacent to the first refractory along the inner wall of the wall to surround the wall;
Finishing a second refractory construction by stacking a thicker thicker edge than the second edge of the second refractory portion of the second refractory lower portion;
Constructing a third refractory material disposed along an upper end of the first refractory material, the third refractory material comprising a lead formed to be spaced apart from a lower end portion of the second refractory material at a predetermined interval; And
Filling a reinforcing refractory in the gap between the lower end of the second refractory and the third refractory; ladle refractory building method comprising.

delete

The method according to claim 6,
The reinforcement refractory includes the same material as the first refractory, ladle refractory building method.

The method according to claim 6,
The second and third refractories, the ladle refractories construction method comprising a material having a higher corrosion resistance and abrasion resistance than the first refractory.

The method according to claim 6,
The first refractories include castable, ladle refractories method of building.