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KR101142342B1 - Sealing method of upper nozzle for tundish and the sealing material - Google Patents

Sealing method of upper nozzle for tundish and the sealing material Download PDF

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Publication number
KR101142342B1
KR101142342B1 KR1020100053396A KR20100053396A KR101142342B1 KR 101142342 B1 KR101142342 B1 KR 101142342B1 KR 1020100053396 A KR1020100053396 A KR 1020100053396A KR 20100053396 A KR20100053396 A KR 20100053396A KR 101142342 B1 KR101142342 B1 KR 101142342B1
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KR
South Korea
Prior art keywords
tundish
sealing
sealing material
upper nozzle
silica
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Application number
KR1020100053396A
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Korean (ko)
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KR20110133792A (en
Inventor
김홍균
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케이씨케미칼 주식회사
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Priority to KR1020100053396A priority Critical patent/KR101142342B1/en
Publication of KR20110133792A publication Critical patent/KR20110133792A/en
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Publication of KR101142342B1 publication Critical patent/KR101142342B1/en

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Continuous Casting (AREA)
  • Ceramic Products (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing method for sealing a gap between an upper nozzle of a tundish and a tundish seam used in a performance work and a sealing material used for sealing the tundish, A method of sealing an upper nozzle for a tundish which can improve the stability of the upper nozzle and improve the quality of the steel by preventing the defects of the steel castings by improving the blocking property of the external air inflow, Sealing material.
According to the present invention, there is provided a sealing material for sealing a tundish, wherein the sealing material comprises 60 to 65 wt% of alumina (Al 2 O 3 ), 28 to 35 wt% of silica (SiO 2 ) and 3 to 4 wt% Wherein the ceramic fiberba is at least one selected from the group consisting of alumina (Al 2 O 3 ), silica (SiO 2 ) and chromium oxide (Cr 2 O 3 ). Sealing material used for sealing is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a sealing method for an upper nozzle for a tundish and a sealing material used for sealing the upper nozzle.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing method for sealing a gap between an upper nozzle of a tundish and a tundish seam used in a performance work and a sealing material used for sealing the tundish, A method of sealing an upper nozzle for a tundish which can improve the stability of the upper nozzle and improve the quality of the steel by preventing the defects of the steel castings by improving the blocking property of the external air inflow, Sealing material.

In general, the casting process in the steel making process of hot rolling produces a slab from molten steel and continuously casts the slab through a tundish.

FIG. 1 is a schematic cross-sectional view showing the structure of a conventional steelmaking plant.

1, a general steelmaking facility includes a ladle 10 for receiving molten steel 1 from a melting furnace (not shown), and a ladle 10 for receiving molten steel 1 in the ladle 10 A tundish 15 for supplying the molten steel 1 to the succeeding unit through the immersion nozzle 23 and a molten steel 1 supplied from the tundish 15 to prepare a casting having a predetermined shape, And a mold 24 for molding.

The slag 2 is inevitably contained in the molten steel 1 and the slag 2 is floated to the upper part of the molten steel 1 so that the initial slag 2 and the molten steel 1, A defective product may be generated when the gas is supplied to the inside of the chamber 24.

In order to prevent this, a dam is formed in the tundish 15. The dam comprises an upper dam 18 formed above the level of the molten steel 1 so as not to flood the molten steel 1 contained in the tundish 15 and forming a passage through which the molten steel 1 flows downward, And a lower dam 17 protruding from the bottom surface of the tundish 15 and formed lower than the upper dam 18.

Although not shown in the drawing, an inert gas such as nitrogen or argon may be supplied to the tundish 15 in order to form the inside of the tundish 15 into a non-oxidizing atmosphere. The reason for injecting the inert gas is that the inside of the tundish 15 is formed in a non-oxidizing atmosphere so that oxygen does not contact the molten steel 1 supplied from the ladle 10 into the tundish 15, So as to improve the casting quality.

The ladle 10 is a container for receiving molten steel 1 from the melting furnace and injecting it into the mold 24. The ladle 10 has a structure in which the refractory material 11 is disposed on the entire inner surface of the container. The refractory material 11 and the ladle 10 have holes at their bottoms, And an inner nozzle 12 is inserted into the inner nozzle 12. The ladle nozzle 13 is connected to the lower end of the inner nozzle 12 so that the molten steel 1 can be supplied to the tundish 15.

The tundish 15 is a container for receiving the molten steel 1 supplied from the ladle 10 and supplying the molten steel 1 to the mold 24 in a stable flow state. The refractory 16 may be disposed on the entire inner surface of the tundish 15 and the refractory 16 and the tundish 15 may have holes formed therethrough at the bottom of the tundish 15, The upper nozzle 22 can be inserted and installed.

An immersion nozzle 23 connected to the upper nozzle 22 is provided at a lower end of the upper nozzle 22 so that the molten steel 1 contained in the tundish 15 passes through the nozzles 13, The molten steel 1 can be injected into the mold 24 through the passage of the molten steel 1. At this time, a stopper 19 is provided on the upper side of the inlet side of the upper nozzle 22 for opening and closing the upper nozzle 22.

However, in the case of the conventional tundish, as shown in FIG. 2, a gap 29 between the upper nozzle 22 and the tundish 15 is generated. During the casting, the upper nozzle 22 of the tundish Oxygen may be introduced into the space between the tundishes 15 or the casting may be generated due to a decrease in temperature, and an unexpected situation occurs due to the flow of the upper nozzle 22 during casting, causing problems during operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to solve the above problems by providing a method of sealing a gap formed between an upper nozzle and a tundish, And to provide a sealing method of a tundish upper nozzle capable of increasing the efficiency of steel production through prevention of economic loss due to shutdown of operation and a sealing material used for the sealing.

According to an aspect of the present invention, there is provided a sealing material which is a refractory insulating material for sealing a tundish, wherein the sealing material comprises 60 to 65 wt% alumina (Al 2 O 3 ), 28 to 35 wt% 2 ) and 3 to 4 wt% of ceramic fiberbavers, wherein the ceramic fiberbaa is at least one selected from the group consisting of alumina (Al 2 O 3 ), silica (SiO 2 ) and chromium oxide (Cr 2 O 3 ) A sealing material used for sealing the upper nozzle for the tundish is provided.

The sealing material may further comprise 1 to 3 wt% of ultrafine powder silica, 0.05 to 0.1 wt% of hydroxyethyl cellulose as a coagulating agent, and 0.1 to 0.2 wt% of polypropylene as a thermal barrier agent.

The particle size of the ultrafine powder silica is preferably 0.040 to 0.045 mm.

According to another aspect of the present invention, there is provided a sealing method for sealing a space between an upper nozzle inserted in a well block installed in a tundish using the sealing material and the tundish, And the sealing member can be filled in the space by using a member.

It is preferable to use a sealing material accommodated in a unit container having a size that can be inserted into the construction member so that the sealing material can be inserted into the gun-type construction member.

According to the present invention as described above, the cause of the casting defect is removed by sealing the gap generated between the upper nozzle and the tundish iron, thereby improving the steel quality and stopping the operation A sealing method of an upper nozzle for a tundish which can increase the efficiency of steel production through prevention of economic loss due to the sealing material, and a sealing material used for the sealing can be provided.

Therefore, according to the present invention, the outer air flowing into the space between the upper nozzle and the tundish seam is blocked, thereby improving the heat insulating property. Therefore, there is no risk of oxygen inflow or temperature drop, have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a structure of a conventional steelmaking plant.
2 is a sectional view of a conventional tundish.
3 is a sectional view of a tundish with a sealing material sealed according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a sealing method of a tundish upper nozzle and a sealing material used for sealing the tundish according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

3 shows an upper nozzle for a tundish according to an embodiment of the present invention.

3, the tundish 31 includes a tundish seam 32 and a refractory 33 disposed on the inner surface of the tundish seam 32. As shown in Fig. The refractory 33 can protect the tundish hanger 32 even if high temperature molten steel is accommodated in the tundish 31. [

At the bottom side of the tundish 31, a louver 34 is formed so that the molten steel can be introduced into a mold (not shown). Although only one louver 34 is shown in the figure, a plurality of louvers 34 are formed at the bottom of the tundish 31 to allow the molten steel to flow down.

A well block 35 may be installed at the luminaire and an upper nozzle 36 may be inserted into the well block 35. At this time, a space of about 5 mm may generally be formed between the upper nozzle 36 and the tundish grease foil 32.

However, according to the preferred embodiment of the present invention, the sealing material 37, which is a refractory material, is installed in the space to improve the fixability of the upper nozzle 36 and to prevent foreign matter from entering the room.

However, in the embodiment of the present invention, the space between the upper nozzle 36 and the tundish seam 32 is sealed. However, if the tundish 31 is cracked, Can also be used for sealing.

Hereinafter, the sealing member 37 used for sealing the space will be described in detail.

[Example]

Alumina (Al 2 O 3 ), silica (SiO 2 ), ceramic fiber and ultrafine silica were blended in the same proportions as in Table 1 below, and water was added thereto, followed by kneading for 3 minutes to prepare a mortar. At this time, the ceramic fiber filter which can improve the heat insulating performance may be made of at least one selected from the group consisting of alumina (Al 2 O 3 ), silica (SiO 2 ) and chromium oxide (Cr 2 O 3 ) The temperature is preferably 1,600 ° C to 1,700 ° C.

The sealing material 37 is composed mainly of alumina (Al 2 O 3 ), silica (SiO 2 ), ceramic fiber and ultrafine silica, and includes hydroxyethyl cellulose as a coagulating agent and polypropylene as a heat- May be added as an additional component. The ultra-fine silica particles have a particle size of about 0.040 mm to 0.045 mm and are inserted between the coarse particles to increase the overall strength of the sealing material 37.

Subsequently, the mortar was introduced into a 40 x 40 x 160 mm sized specimen mold and vibrated with a table vibrator to remove the inner pores, followed by natural drying for 24 hours to demould. The obtained resultant was fired at a temperature of 1,400 ° C for 3 hours and cooled to prepare a specimen for measuring the properties of Examples and Comparative Examples, and the modulus of rupture and the permanent change of liners were measured.


Raw material name Example Comparative Example One 2 3 One 2 Al 2 O 3 (wt%) 60 62 65 75 72 SiO 2 (wt%) 35 33 28 15 16 Ceramic fiber
(wt%) 3 3 4 10 9 Ultrafine silica (wt%) 2 2 3 - 3 Total (wt%) 100 100 100 100 100 Flocculant (wt%) ★ 0.1 0.05 0.1 - - Anti-thermal agent
(wt%) * 0.2 0.2 0.2 - 0.1 Ruggedness
(kg / cm2) 29 33 27 12 15 Line change rate (%)
at 1,400 ° C x 3hrs -1.45 -1.50 -1.85 -2.33 -2.52

★ : The coagulant and the anti-thermal agent can be added in an appropriate ratio to the weight ratio of Table 1 to 100 wt% of the sealing material composed mainly of alumina (Al 2 O 3 ), silica (SiO 2 ), ceramic fiber and ultrafine powder silica have.

As can be seen from Table 1, the case of Examples 1 to 3 is applied to the gap between the upper tundish upper nozzle 36 and the tundish tundish 32, which is the object of the present invention, 37), it was found that the properties of the ceramic composition such as bending strength and line change ratio were all excellent. However, in the case of Comparative Examples 1 and 2, the line change rate exceeded 2% and excessive shrinkage occurred in the space between the upper nozzle 36 and the tundish seam 32, so that the sealing material could not function. In the case of Comparative Examples 1 and 2, the bending strength is significantly lower than that of the embodiment, so that the sealing member 37 supports the well block 35 so that the upper nozzle 36 can be firmly fixed in the well block 35 The crowd follows.

Alumina (Al 2 O 3) is from 60 to 68 wt% one time, more preferably alumina (Al 2 O 3) is 60 to time 65 days wt% during the casting operation at more than 1,400 ℃ high temperature region bending strength show excellent physical properties It was possible to secure the thermal stability. Preferably, the silica (SiO 2 ) may be 28 to 35 wt%, the ceramic fiber may be 3 to 4 wt%, and the ultrafine powder silica may be 1 to 3 wt%.

In addition, as an auxiliary component of the sealing material, 0.05 to 0.1 wt% of hydroxyethyl cellulose as an aggregating agent and 0.1 to 0.2 wt% of polypropylene as a thermal barrier agent may be added.

Therefore, in the case of the sealing material 37 according to the present invention, it is possible to secure the hot stability even in the high temperature region of 1,400 DEG C or more at the time of casting in the tundish 31. [

In the case of the above-mentioned sealing material (37), since it can be manufactured as a product which is mixed with kneaded state, it is possible to construct a gun type like a silicone gun in a state of being packed in a container so that sealing is easy. have.

Further, in order to use a sealing material in a gun-type sealing member (not shown), the sealing material can be accommodated in a unit container having a predetermined size. The sealing material contained in the unit container is advantageous in terms of maintenance since it can be replaced if used.

As described above, the sealing method of the upper nozzle for tundish according to the present invention and the sealing material used for the sealing are described with reference to the preferred embodiments of the present invention. However, it should be understood that the present invention is not limited to the above-described embodiments and drawings, and various modifications and changes may be made by those skilled in the art without departing from the scope of the present invention.

31: Tundish 32: Tundish
33: refractory material 34:
35: Well block 36: Upper nozzle
37: Sealing material

Claims (5)

A sealing material for sealing a tundish,
The sealing material is composed of 60 to 68 wt% of alumina (Al 2 O 3 ), 28 to 35 wt% of silica (SiO 2 ), 3 to 4 wt% of ceramic fiber and 1 to 3 wt% of ultrafine silica ,
Wherein the ceramic fiberba is at least one selected from the group consisting of alumina (Al 2 O 3 ), silica (SiO 2 ) and chromium oxide (Cr 2 O 3 ). The method according to claim 1,
Wherein the sealing material is further added with 0.05 to 0.1 wt% of hydroxyethyl cellulose and 0.1 to 0.2 wt% of polypropylene as a coagulant to 100 wt% of the sealing material, Sealing material used for sealing The method of claim 2,
Wherein the particle size of the ultrafine powdered silica is 0.040 to 0.045 mm. A sealing method for sealing a space between an upper nozzle inserted in a well block installed in a tundish and a tundish,
A method of sealing an upper nozzle for a tundish according to any one of claims 1 to 3, wherein the sealing material is filled into the space using a gun-type installation member. The method of claim 4,
Wherein the seal member is accommodated in a unit container having a size that can be inserted into the construction member.
KR1020100053396A 2010-06-07 2010-06-07 Sealing method of upper nozzle for tundish and the sealing material KR101142342B1 (en)

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KR101142342B1 true KR101142342B1 (en) 2012-05-18

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102227831B1 (en) * 2019-08-19 2021-03-15 주식회사 포스코 Processing method for container and charging method for melt
CN110734267A (en) * 2019-11-19 2020-01-31 怀化市德宏酒业有限公司 wine jar sealing material and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010060401A (en) * 1999-12-21 2001-07-07 신현준 Batch composition of chshion mortar for area of blast furnace
KR100491123B1 (en) 2002-08-17 2005-05-25 주식회사 포스코 High intensity castable refractories with good adiabatic and high thermal shock resistance
KR20050064054A (en) * 2003-12-23 2005-06-29 주식회사 포스코 Sealing materials composition having excellent sealing and adhension property
KR20060024248A (en) * 2004-09-13 2006-03-16 주식회사 포스코 Batch composition of thermal insulation packing materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010060401A (en) * 1999-12-21 2001-07-07 신현준 Batch composition of chshion mortar for area of blast furnace
KR100491123B1 (en) 2002-08-17 2005-05-25 주식회사 포스코 High intensity castable refractories with good adiabatic and high thermal shock resistance
KR20050064054A (en) * 2003-12-23 2005-06-29 주식회사 포스코 Sealing materials composition having excellent sealing and adhension property
KR20060024248A (en) * 2004-09-13 2006-03-16 주식회사 포스코 Batch composition of thermal insulation packing materials

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