KR101312513B1 - Edge dam of twin roll strip cater - Google Patents

Edge dam of twin roll strip cater Download PDF

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KR101312513B1
KR101312513B1 KR1020100136198A KR20100136198A KR101312513B1 KR 101312513 B1 KR101312513 B1 KR 101312513B1 KR 1020100136198 A KR1020100136198 A KR 1020100136198A KR 20100136198 A KR20100136198 A KR 20100136198A KR 101312513 B1 KR101312513 B1 KR 101312513B1
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South Korea
Prior art keywords
edge
edge dam
molten steel
refractory
sealing plate
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KR1020100136198A
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Korean (ko)
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KR20120074383A (en
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정한남
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재단법인 포항산업과학연구원
주식회사 포스코
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Priority to KR1020100136198A priority Critical patent/KR101312513B1/en
Publication of KR20120074383A publication Critical patent/KR20120074383A/en
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  • Mechanical Engineering (AREA)
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Abstract

It provides edge dam of twin roll sheet casting machine.
The present invention provides an edge dam of a twin-roll type sheet casting machine provided in the pair of right and left sides of the pair of casting rolls to block the outflow of the molten steel filled in the molten steel pool formed between the pair of casting rolls facing each other. An edge dam refractory sealing the molten steel pool by having a sealing plate in direct contact with the side portions of the pair of casting rolls on an inner surface corresponding to the pair of casting rolls; A recess formed in a predetermined depth in the outer surface region of the edge dam refractory corresponding to the longitudinal section of the molten steel pool; .

Description

 Edge dam of twin roll strip cater

The present invention relates to an edge dam provided in a twin-roll sheet casting machine, and more particularly, to preheating conditions and preheating means for edge dams in which the thickness of the edge dam refractory increases with increasing thickness of the sealing plate for long time casting. As a result, the edge dam refractory can be preheated satisfactorily, and solidification formation of molten steel on the surface of the edge dam refractory is not continued for a long time at the beginning of casting, thereby reducing the heat loss of the molten steel by the edge dam refractory during casting for a long time. The present invention relates to an edge dam of a twin roll sheet casting machine that can be used for casting.

In general, a twin-roll thin sheet casting process supplies molten steel between a pair of casting rolls being cooled to a cooling source such as circulating cooling water, and then rotates a pair of casting rolls facing each other in an interlocking direction. It is a casting process that continuously manufactures thin steel sheets directly from molten steel exiting through the roll gap between casting rolls.

As shown in FIG. 1A, a twin roll sheet caster to which such a casting process is applied is provided with a pair of casting rolls R and R 'which are disposed in parallel to each other and parallel to the left and right sides of the molten steel ( A pair of edge dams (E, E ') for sealing molten steel outflow while forming a molten steel pool filled with M), and a molten steel supply nozzle for supplying molten steel (M) from a tundish (not shown) to the molten steel pool. (N) and the like.

When the casting rolls R and R 'are rotated in the interlocking direction while supplying molten steel M to form a molten steel pool formed between the pair of casting rolls R and R', the pair of castings On the surface of the rolls R and R ', solidification shells are formed, and a pair of solidification shells are merged with each other near the proximity of the casting rolls R and R', so that the thin slabs S are continuously cast. do.

Edge dams (E, E '), which is essentially applied to such a twin-roll sheet caster, as shown in Figure 1b, the edge dam refractories (1) of approximately reverse triangle sealing the molten steel pool formed between a pair of casting rolls ), And a sealing plate 2 formed on the inner surface of the edge dam refractory to directly contact the pair of casting rolls R and R 'side parts. It must be preheated to a predetermined temperature before casting by heating means such as burner or electric heater, and during casting, heating or insulating the back by continuously supplying heat from the edge dam to suppress the heat loss of molten steel by the edge dam. Done.

On the other hand, in using the conventional edge dams (E, E ') as described above, if the preheating conditions and preheating conditions before casting or during casting, as shown in Figure 2a, the edge dam refractory (1) A crack (C) is generated in the) and this causes problems such as penetration of molten steel or breakage of the refractory.

In addition, when the preheating temperature of the edge dam refractory material 1 is low, molten steel solidifies on the molten steel contact surface of the edge dam refractory material 1 to form a solidified body K, and the growth and dropping are repeated during casting. If the solidified body (K) falls into the casting roll (R, R ') it will cause casting instability or casting interruption.

Accordingly, Korean Patent Application No. 2001-0082233 proposed a method of suppressing solidification of molten steel on the edge dam surface by applying a sealing plate material having low thermal conductivity, thereby suppressing molten steel solidification on the surface of the sealing plate 2. . However, when the thickness of the edge dam refractory material 1 becomes thick or the preheating state becomes poor, the solidification of molten steel on the surface of the edge dam refractory material 1 may not be completely prevented.

In the conventional edge dam, as shown in FIG. 2B, the sealing plates 2 are embedded in the movable surface of the edge dam refractories 1, particularly around the site where the edge dam is in contact with the casting rolls R and R '. The edge dam refractory 1 is firmly fixed to the edge dam refractory, and the edge dam refractory 1 is capable of withstanding the load when the sealing plate 2 is pressed against the casting rolls R and R '. The appropriate thickness (Ts) behind the c) is required.

On the other hand, the total thickness T of the edge dam refractory material 1 is determined by the thickness Tw that wears the sealing plate 2 during casting, and generally, the sealing plate 2 that is worn when casting 100 tons of molten steel is cast. The thickness Tw is about 6 to 10 mm.

Accordingly, in order to cast about 500 tons or more of molten steel, the thickness Tw of the sealing plate 2 should be at least 30 to 50 mm or more, so that the thickness T of the edge dam refractory material 1 is a sealing plate ( Considering the depth of 2), it is thickened to about 60 ~ 80 mm or more.

If only the thickness Tw of the sealing plate 2 is increased while the thickness T of the edge dam refractory 1 is maintained as it is, the sealing plate (from the surface of the edge dam refractory 1) is increased. 1) is excessively protruded to about 5 mm or more and the fixing force is weakened, which is a problem that the damage of the sealing plate 1 frequently occurs during casting.

Therefore, when the thickness Tw of the sealing plate 2 is required for long time casting, the thickness T of the edge dam refractory material 1 is also preferably increased, but the thickness T of the edge dam refractory material 1 is increased. Increasing) increases the preheating condition.

In addition, when the preheating time is extended to solve the preheating problem of the thickened edge dam refractories 1, the productivity of the casting process is decreased, the energy use is increased, and the characteristics of the sealing plate 2 are changed. May result.

Typically, the sealing plate 2 is made of a material having a machinability so that it can be stably worn by the friction of the casting rolls (R, R '), typically, oxides, nitrides, nitrides or carbides with boron nitride The complex is applied.

When the boron nitride composite is heated in air at a temperature of about 850 ° C. or more for a long time, oxidation is severely increased with increasing heating temperature and heating time to form a thick oxide layer on the surface of the sealing plate 2 or a composite material. By forming a low melting point and the casting can be degraded characteristics of the sealing plate (2) at the beginning.

Therefore, Korean Patent Application No. 2005-0127562 or 2007-0097703 has proposed a method of simultaneously heating the front and rear of the edge dam refractories 1 in order to more quickly preheat the edge dam refractories 1.

However, when the thickness of the edge dam refractory material 1 is thicker than about 60 mm, a temperature gradient between both surfaces and the inside occurs, and the edge dam refractory material 1 often cracks during preheating. On the movable surface side, since it is difficult to heat at high temperature in order to prevent oxidation of the sealing plate 2, a favorable preheating state is hard to be obtained.

In addition, as the edge dam refractory material 1 becomes thicker, heat loss of the molten steel M increases during casting, and the time for which the edge dam refractory material 1 is heated to a predetermined temperature by the molten steel M becomes longer. Therefore, as the time for which solidified solids are formed and dropped on the surface of the edge dam refractory 1 becomes longer, casting stability is lowered.

Therefore, in the case where the thickness of the edge dam refractory material 1 should be increased for long time casting, a means capable of satisfactorily heating and preheating the edge dam is required even by conventional heating and preheating conditions.

The present invention is to solve the problems described above, the edge dam refractory as a normal preheating condition and preheating means for the edge dam that the thickness of the edge dam refractory increases with the increase of the thickness of the sealing plate for long time casting It can be pre-heated, and the pair can be used for long time casting stably by reducing the heat loss of molten steel by edge dam refractory during casting by preventing the solidification formation of molten steel on the surface of edge dam refractory in the early stage of casting. It is an object to provide an edge dam of a roll type sheet casting machine.

The present invention for achieving the above object, a twin-roll sheet caster provided on the left and right sides of the pair of cast rolls to block the outflow of the molten steel filled in the molten steel pool formed between a pair of casting rolls facing each other In the edge dam of

 An edge dam refractory sealing the molten steel pool by having a sealing plate in direct contact with the side portions of the pair of casting rolls on an inner surface corresponding to the pair of casting rolls;

A recess formed in a predetermined depth in the outer surface region of the edge dam refractory corresponding to the longitudinal section of the molten steel pool; It provides an edge dam of a twin roll sheet caster, characterized in that it comprises a.

In addition, the left and right both edges of the concave portion is preferably provided to be disposed in the region corresponding to the sealing plate.

And, the left and right both edges of the concave portion is disposed on the outside rather than the outer edge of the casting roll, it is more preferably provided to be disposed on the inner side than the outer edge of the sealing plate.

In addition, the upper edge of the concave portion is preferably provided at a position higher than the hot water surface of the molten steel filled in the molten steel pool, and lower than the upper edge of the edge dam refractory.

And, the upper edge of the concave portion is more preferably provided 10mm or more higher than the water surface.

In addition, it is preferable that the concave portion is provided with a flat surface having a flat bottom surface corresponding to the molten steel pool.

And, the refractory thickness of the back of the sealing plate is preferably set to 1/2 or more of the maximum thickness of the edge dam refractory.

The maximum depth of the recess is preferably set so that the difference between the refractory thickness of the back of the sealing plate and the maximum depth of the recess is 10 mm or more.

The maximum depth of the concave portion is more preferably set to 20 to 30 mm or more.

In addition, the concave portion is preferably provided in a curved shape in which the bottom surface corresponding to the molten steel pool is concave toward the molten steel pool side.

And, the maximum depth of the concave portion is set to be larger than the refractory thickness of the back side of the sealing plate and less than 1/3 of the total thickness of the edge dam refractory so that the maximum wear thickness of the sealing plate compared to the refractory thickness of the back of the sealing plate is about 1.5 times or more. It is preferable.

According to the present invention as described above, the sealing plate and the edge for a long time casting by forming a recess formed in a predetermined depth in the outer surface of the edge portion refractory formed on both side ends of the pair of casting roll to form a molten steel pool Even when the total thickness of the dam refractory becomes thick, a thin area corresponding to the molten steel pool can be formed thinly so that a good preheating state can be obtained under conventional preheating and heating conditions, and the durability of the edge dam refractory can be prevented. It is possible to stably perform sheet casting by improving molten steel containment instability problem caused by solidification of molten steel on the surface of edge dam and having durability for a long time.

1 shows a typical twin roll sheet caster,
(a) is a full perspective view
(b) is a block diagram of an edge dam.
Figure 2 shows the edge dam of the twin-roll sheet caster according to the prior art
(a) is a schematic diagram
(b) is a longitudinal cross-sectional view.
3 illustrates an edge dam of a twin roll sheet caster according to a first embodiment of the present invention.
(a) is a front view,
(b) is a longitudinal cross-sectional view.
4 is a cross-sectional view showing an edge dam of a twin roll sheet caster according to a first embodiment of the present invention.
5 is a cross-sectional view showing the edge dam of the twin-roll sheet caster according to a second embodiment of the present invention.

The objects, features and advantages of the present invention described above will become more apparent from the following detailed description. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 shows an edge dam of a twin roll sheet caster according to a first embodiment of the present invention, (a) is a front view, (b) is a longitudinal sectional view, and FIG. 4 is a first embodiment of the present invention. It is a cross-sectional view which shows the edge dam of the twin-roll type sheet casting machine.

Edge dam 100 according to the first embodiment of the present invention to solve the problems of the thick refractory that should be about 60 ~ 80 mm thick for long time casting, edge dam refractory 110, sealing plate ( 120 and recess 130.

The edge dam refractory 110 recesses and forms recesses 115 recessed in a predetermined depth in the inner surface corresponding to the pair of casting rolls R and R ′, and the pair of recesses 115 in the recesses 115. It has a sealing plate 120 which is worn in direct contact with the side portion of the casting roll of the, and consists of a refractory of approximately inverted triangle sealing the molten steel pool filled with molten steel.

The concave portion 130 is formed to have a predetermined depth in the outer surface region of the edge dam refractory 110 corresponding to the longitudinal section of the molten steel pool formed while the molten steel is filled to control the increase in thickness of the edge dam refractory 110 will be.

That is, the edge dam 100 is heated to about 900 ~ 1400 ℃ on the outer surface side of the rear surface before casting and, if necessary, heated to about 1000 ℃ or less on the inner surface side of the movable surface, if necessary to preheat about 1.5 to 3 hours In addition, during casting, a heat source is provided on the outer surface side of the edge dam to maintain heating.

In addition, the edge dam 100 is in close contact with the side of the casting roll (R, R ') before the start of casting, and during the casting, the sealing plate 120 and the casting roll (R) so that the molten steel of the molten steel pool is sealed without leaking. , Both ends of R ') are pressurized by a pressing force of a certain intensity by pressing means not shown.

Under such use conditions, when the construction conditions and design conditions of the recess 130 formed in a predetermined depth on the outer surface of the edge dam refractory 110 are not appropriate, the edge dam refractory 110 is degraded in durability. This results in cracks or breakage.

That is, when the recessed depth of the recess 130 formed in the outer surface of the edge dam refractory 110 is deep and the recessed area is formed wide, the thickness of the edge dam refractory 110 is generally thinned, thereby preheating and molten steel. Although there is an advantage in suppressing solidification, on the contrary, since the durability of the edge dam refractory 110 may be lowered and the performance of the edge dam 100 may be lowered, an appropriate design is required.

Accordingly, in designing the size of the concave portion 130 recessed on the outer surface side of the edge dam refractory 110, as shown in Figure 3, the casting roll is rotated in the direction interlocking with each other during casting The left and right edges 131 and 132 of the concave portion 130 correspond to the sealing plate 120 when the locus positions of the R and R ′ and the inner locus of the sealing plate 120 are projected to the outer surface. Is formed on the outer side of the casting roll (R, R ') and the outer edge of the casting roll (R, R') corresponding to the trace, and the sealing plate 120 corresponding to the trace of the sealing plate 120 It is preferable to be disposed inward rather than the outer edge of the, so that the left and right edges (131, 132) of the concave portion 130 is the outer edge of the casting roll (R, R ') and the outer side of the sealing plate 120 It is arranged in the area between the border.

The recess 130 is provided with an inverted triangle that is substantially similar to the longitudinal end face of the molten steel and the longitudinal end face of the edge dam refractory 110.

In addition, the upper edge 133 of the concave portion 130 is provided to be disposed at a position higher than the hot water surface (L) of the molten steel (M) filled in the molten steel pool, and lower than the upper edge of the edge dam refractory (110). Preferably, the upper edge 133 of the concave portion 130 is preferably provided 10mm or more higher than the hot water surface (L).

Accordingly, the upper edge of the recess 130 is disposed between the hot water surface of the molten steel and the upper edge of the edge dam refractory 110.

On the other hand, as shown in Figure 4, the concave portion 130, the bottom surface corresponding to the molten steel pool may be provided in a flat plane or as shown in Figure 5 may be provided in a curved concave toward the molten steel pool side. .

That is, the refractory minimum thickness Te of the front end of the recess 130 corresponding to the contact surface in contact with the molten steel is to be thinned by the maximum depth d of the recess, and the remaining portion where the recess 130 is not formed is It is preferable to adjust the thickness of the edge dam refractory 110 to maintain the maximum thickness T of the edge dam refractory 110 or at least the refractory thickness Ts of the back side of the sealing plate so as to stably support the sealing plate 120. .

Through the formation of the concave portion 130 as described above, the edge dam 100 of the present invention increases the preheating effect and reduces the heat loss of the molten steel to the minimum by heating the back of the edge dam refractory 110 during casting. ) To prevent the molten steel from solidifying and at the same time to maintain the durability of the refractory.

In the configuration of the edge dam 100 of the present invention, the width of the recess 130 formed in the outer surface, which is the back surface of the edge dam refractory 110, is too wide or the depth of the recess is too deep so that the back of the sealing plate 120 When the refractory thickness (Ts) to support the thinner when the sealing plate 120 is pressurized by the casting roll (R, R ') may be damaged due to degradation, conversely, the width of the concave portion 130 is too If the depth is narrow or shallow, the reduction effect on the minimum thickness Te of the edge dam refractory 110 by the concave portion 130 is lowered, thereby preheating the preheating of the edge dam refractory 101 and the casting is poor. It will cause the molten steel to solidify.

Accordingly, as shown in Figure 4, when the bottom surface of the recess 130 is provided with a flat flat surface, the refractory thickness (Ts) of the back of the sealing plate is 1 of the edge dam refractory maximum thickness (T). It is preferable to set it to / 2 or more.

In this case, the depth d of the recess 130 is adjusted so that the difference Ts-d of the maximum depth d of the recess with respect to the refractory thickness Ts on the rear side of the sealing plate is at least 10 mm. Preferably, the maximum depth d of the concave portion is preferably set to 20 to 30 mm or more.

In addition, as shown in FIG. 5, when the bottom surface of the concave portion 130 is provided in a curved shape, the maximum wear thickness Tw of the sealing plate is about 1.5 times higher than the refractory thickness Ts of the rear side of the sealing plate. It is preferable to set as above.

In such a case, the maximum depth d of the recess 130 is set between a minimum value larger than the refractory thickness Ts on the rear side of the sealing plate and a maximum value not exceeding 1/3 of the total thickness T of the edge dam refractory material. It is preferable.

Accordingly, in the case where the thickness of the sealing plate 120 and the edge dam refractory 110 of the edge dam 100 needs to be thick for long time casting in a twin roll type sheet casting machine, it is the back surface of the edge portion refractory 110. By forming a recess 130 recessed to a certain depth on the outer surface, the preheating state of the thick edge dam refractory becomes poor through the function of compensating for the increase in the thickness of the main portion of the edge dam refractory 110. Since it is possible to solve the cracking of the edge dam refractory and solidification of molten steel at the beginning of casting, the edge dam can be used stably for a long time, and the sheet can be continuously cast without defect of the edge dam.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

110: edge dam refractory 120: sealing plate
130: recessed R, R ': casting roll
L: Molten steel M: Molten steel
T: edge dam refractory maximum thickness
d: maximum depth of recess
Ts: sealing plate back side refractory thickness
Tw: Seal Plate Maximum Wear Thickness
Te: recess shear refractory minimum thickness

Claims (11)

In the edge dam of the twin-roll sheet caster provided on the left and right short sides of the pair of casting rolls to block the outflow of the molten steel filled in the molten steel pool formed between the pair of casting rolls facing each other,
An edge dam refractory for sealing the molten steel pool by having a sealing plate in direct contact with the side portions of the pair of casting rolls on an inner surface corresponding to the pair of casting rolls;
A recess formed in a predetermined depth in the outer surface region of the edge dam refractory corresponding to the longitudinal section of the molten steel pool; Including;
The edge edge of the concave portion is edge edge of the twin-roll sheet caster, characterized in that it is arranged to be located higher than the hot surface of the molten steel filled in the molten steel pool, and lower than the top edge of the edge dam refractory. The method of claim 1,
Edge dams of the left and right sides of the concave portion is provided so as to be disposed in the area corresponding to the sealing plate. 3. The method of claim 2,
Edges of the left and right sides of the concave portion is disposed on the outer side than the outer edge of the casting roll, the edge dam of the twin-roll type sheet caster, characterized in that it is provided to be disposed on the inner side than the outer edge of the sealing plate. delete The method of claim 1,
Edge of the upper edge of the concave portion of the twin roll type cast machine, characterized in that provided more than 10mm higher than the hot water. The method according to any one of claims 1 to 3,
The concave portion edge dam of the twin roll sheet caster, characterized in that the bottom surface corresponding to the molten steel pool is provided with a flat flat surface. The method according to claim 6,
The refractory thickness of the rear side of the sealing plate is the edge dam of the twin-roll sheet caster, characterized in that it is set to more than 1/2 of the maximum thickness of the edge dam refractory. The method according to claim 6,
The maximum depth of the concave portion is the edge dam of the thin roll type cast machine, characterized in that the difference between the refractory thickness of the back of the sealing plate and the maximum depth of the concave portion is set to 10 mm or more. The method according to claim 6,
Edge dam of the twin-roll sheet caster, characterized in that the maximum depth of the recess is set to 20 ~ 30mm or more. The method according to any one of claims 1 to 3,
The concave portion edge dam of the twin roll sheet caster, characterized in that the bottom surface corresponding to the molten steel pool is provided in a curved concave toward the molten steel pool side. The method of claim 10,
The maximum depth of the recess is set to be larger than the thickness of the refractory on the back of the sealing plate and less than 1/3 of the total thickness of the edge dam refractory so that the maximum wear thickness of the sealing plate is 1.5 times or more than the thickness of the refractory on the back of the sealing plate. Edge dam of twin roll sheet casting machine.
KR1020100136198A 2010-12-28 2010-12-28 Edge dam of twin roll strip cater KR101312513B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004106010A (en) * 2002-09-18 2004-04-08 Nippon Steel Corp Side weir for twin roll type continuous casting equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004106010A (en) * 2002-09-18 2004-04-08 Nippon Steel Corp Side weir for twin roll type continuous casting equipment

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