KR20030044589A - Tundish dam for guiding molten iron - Google Patents

Tundish dam for guiding molten iron Download PDF

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Publication number
KR20030044589A
KR20030044589A KR1020010075401A KR20010075401A KR20030044589A KR 20030044589 A KR20030044589 A KR 20030044589A KR 1020010075401 A KR1020010075401 A KR 1020010075401A KR 20010075401 A KR20010075401 A KR 20010075401A KR 20030044589 A KR20030044589 A KR 20030044589A
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KR
South Korea
Prior art keywords
dam
tundish
molten steel
molten iron
flow
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KR1020010075401A
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Korean (ko)
Inventor
성위영
정종온
박장규
김용태
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주식회사 포스코
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Priority to KR1020010075401A priority Critical patent/KR20030044589A/en
Publication of KR20030044589A publication Critical patent/KR20030044589A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE: A tundish dam for guiding molten iron is provided to prevent the molten iron from flowing back so as to improve a slag separation effect, resulting in enhancement of intermediate product. CONSTITUTION: The tundish dam for guiding molten iron comprises a tundish case(10) and a first and second dams(20,30) formed inside the tundish in such a way that a lower edge of the first dam(20) is higher than a bottom of the tundish, a lower edge of the second dam(3) contact the bottom of the tundish, and an upper edge of the first dam(20) is higher than that of the second dam(30), wherein a wall of the second dam(30) facing the first dam(20) is slanted to a molten iron outlet as going upward and is provided with a plurality of passage holes(34) formed at a bottom portion widthwise in order for the molten iron to partially flow therethrough. In this construction, the molten iron does not flow back or flow over the first dam(20), since the slanted wall and passage holes reduce the pressure of the molten iron between the first and second dams(20,30).

Description

용강 흐름 유도용 턴디쉬 댐{Tundish dam for guiding molten iron}Tundish dam for guiding molten iron}

본 발명은 턴디쉬 댐에 관한 것으로서, 보다 상세하게는 용강의 흐름을 용강 상면쪽으로 유도시킬 수 있도록 된 용강 흐름 유도용 턴디쉬 댐에 관한 것이다.The present invention relates to a tundish dam, and more particularly, to a tundish dam for inducing molten steel flow to guide the flow of molten steel toward the upper surface of the molten steel.

일반적으로 연속주조작업에 사용되는 턴디쉬(Tundish)(110)는 도1에 개략적으로 도시된 바와 같이, 래들(120)의 용강을 롱 노즐(130)을 통해 공급받아 몰드(140)로 배출시키도록 구비됨으로써 슬라브(150)의 연속 주조가 가능하게 한다.In general, the tundish 110 used in the continuous casting operation receives the molten steel of the ladle 120 through the long nozzle 130 and discharges the mold 140 to the mold 140 as schematically illustrated in FIG. 1. It is provided so that the continuous casting of the slab 150 is possible.

상기 턴디쉬(110)의 보다 상세한 구조가 도2에 도시되는바, 상부가 개방된 용기 형상의 턴디쉬(110)는 일측 상부에 구비된 롱 노즐(130)로부터 용강을 공급받고 타측 하부에 구비된 용강 배출구(112)를 통해 용강을 몰드(140)로 배출시킨다.A more detailed structure of the tundish 110 is shown in FIG. 2, and the tundish 110 having a container shape with an open top is supplied with molten steel from the long nozzle 130 provided at one upper side and provided at the lower side of the other side. The molten steel is discharged to the mold 140 through the molten steel outlet 112.

그리고, 이 턴디쉬(110)의 내부에는 제1댐(114)가 제2댐(116)이 설치되는바, 상기 제1댐(114)은 하단이 턴디쉬(110)의 바닥보다 상부에 위치되도록 상기 롱 노즐(130)과 용강 배출구(112) 사이에 고정 설치되고, 상기 제2댐(116)은 하단이 턴디쉬(110)의 바닥에 위치되고 상기 제1댐(114)보다 용강 배출구(112)쪽에 더 가깝게 위치되도록 고정 설치된다. 또한, 상기 제2댐(116)의 하단부 중앙에는 도3에 도시된 바와 같이 용강 잔탕을 통과시킬 수 있도록 구멍(117)이 형성된다.In addition, the first dam 114 has a second dam 116 installed inside the tundish 110, and the first dam 114 has a lower end located above the bottom of the tundish 110. It is fixedly installed between the long nozzle 130 and the molten steel outlet 112, the lower end of the second dam 116 is located on the bottom of the tundish 110 and the molten steel outlet (1) than the first dam (114) It is fixedly installed to be closer to 112). In addition, a hole 117 is formed in the center of the lower end of the second dam 116 to allow molten steel resids to pass through as shown in FIG. 3.

즉, 롱 노즐(130)에서 배출된 용강은 제1댐(114)의 하단과 턴디쉬(110)의 바닥 사이를 통해 제2댐(116)쪽으로 흐르다가 제2댐(116)에 의해 턴디쉬(110)의 상부쪽으로 향하는 흐름인 피스톤플로우(Piston flow)가 유발됨으로써 용강내에 존재하는 개재물들이 보다 용이하게 용강 상부로 부상 분리될 수 있게 한다.That is, the molten steel discharged from the long nozzle 130 flows toward the second dam 116 between the bottom of the first dam 114 and the bottom of the tundish 110 and is tundished by the second dam 116. Piston flow, which is a flow directed towards the top of 110, is induced to allow inclusions present in the molten steel to more easily float to the upper portion of the molten steel.

그러나, 종래 기술은 다음과 같은 문제점을 갖는다.However, the prior art has the following problems.

먼저, 제1댐(114)의 하부를 통과한 용강이 제2댐(116)과 수직하게 충돌하면서 용강의 전체적인 흐름과 반대방향의 반전류(F1)가 형성되고, 이는 상향류(F2)의세기를 약화시켜 용강 상부로 부상되던 개재물들이 용강 하부로 내려가는 문제점을 갖는다.First, the molten steel passing through the lower portion of the first dam 114 collides perpendicularly with the second dam 116 to form a reverse flow F1 in the opposite direction to the overall flow of the molten steel, Inclusions that have risen to the top of the molten steel by weakening the strength has a problem falling down to the bottom of the molten steel.

다음에, 제1댐(114)의 상단이 용강의 상면보다 하부에 위치되어 롱 노즐(130)측 용강 및 슬라그가 F3로 도시된 것처럼 제1댐(114)을 덤어 용강 배출구(112) 상부측으로 이동됨은 물론, 이렇게 이동된 슬라그가 용강 흐름을 따라 용강 배출구(112)로 배출됨으로써 슬라브의 품질을 저하시키는 것은 물론 용강 배출구(112) 등의 막힘을 유발시키는 문제점을 갖는다.Next, the upper end of the first dam 114 is located below the upper surface of the molten steel so that the long nozzle 130 side molten steel and slag are driven toward the upper side of the molten steel outlet 112 through the first dam 114 as shown by F3. As well as being moved, the slag thus moved is discharged to the molten steel outlet 112 along the molten steel flow, thereby lowering the quality of the slab and causing the clogging of the molten steel outlet 112 and the like.

다음에, 롱 노즐(130)에서 배출된 용강이 주조 말기에 턴디쉬내에 존재하는 용강 잔탕을 통과시키도록 형성된 제2댐(116) 하단의 구멍(117)을 통해서 직접 용강 배출구(112)쪽으로 다량 이동됨으로써 용강에 포함된 개재물들이 부상되지 않고 몰드로 배출됨으로써 슬라브의 품질을 저하시키는 문제점을 갖는 것이었다.Next, a large amount of molten steel discharged from the long nozzle 130 passes directly to the molten steel outlet 112 through the hole 117 at the bottom of the second dam 116 formed to pass the molten steel residual water present in the tundish at the end of the casting. By moving the inclusions contained in the molten steel was not injured and discharged into the mold had a problem of lowering the quality of the slab.

본 발명은 이러한 종래의 문제점을 해결하기 위한 것으로서, 용강의 전체적인 흐름과 반대방향인 반전류의 발생을 억제시켜 용강에 포함된 개재물의 부상 분리가 효과적으로 수행될 수 있도록 된 용강 흐름 유도용 턴디쉬 댐을 제공함에 그 목적이 있다.The present invention is to solve the conventional problems, the molten steel flow induced tundish dam to suppress the occurrence of the reverse flow in the opposite direction to the overall flow of the molten steel so that the floating separation of the inclusions contained in the molten steel can be effectively performed The purpose is to provide.

도1은 일반적인 연속주조설비의 개략 구성도;1 is a schematic configuration diagram of a typical continuous casting facility;

도2는 종래기술에 따른 턴디쉬의 개략 구성도;2 is a schematic structural diagram of a tundish according to the prior art;

도3는 종래에 사용되던 턴디쉬의 제2댐이 도시된 사시도;3 is a perspective view showing a second dam of a tundish conventionally used;

도4는 본 발명에 따른 턴디쉬의 개략 구성도;4 is a schematic structural diagram of a tundish according to the present invention;

도5는 본 발명의 제2댐이 도시된 사시도;5 is a perspective view showing a second dam of the present invention;

도6은 본 발명의 작용 설명도이다.6 is an explanatory view of the operation of the present invention.

※도면의 주요부분에 대한 부호의 설명※※ Explanation of symbols about main part of drawing ※

10 : 턴디쉬12 : 용강배출구10: tundish 12: molten steel outlet

130 : 롱노즐140 : 몰드130: long nozzle 140: mold

20 : 제1댐30 : 제2댐20: first dam 30: second dam

32 : 경사면34 : 구멍32: slope 34: hole

상기한 목적을 달성하기 위한 기술적인 구성으로서, 본 발명은, 하단이 턴디쉬의 바닥 보다 상부에 위치되도록 턴디쉬에 설치된 제1댐과, 용강 잔탕 배출용 구멍을 갖는 하단이 턴디쉬의 바닥에 위치되고 상기 제1댐보다 용강 배출구 쪽에 가깝게 위치된 제2댐으로 이루어진 용강 흐름 유도용 턴디쉬 댐에 있어서, 상기 제2댐은 제1댐쪽 표면이 상부로 갈수록 용강 배출구 쪽으로 가까워지는 경사면으로 형성됨을 특징으로 하는 용강 흐름 유도용 턴디쉬 댐을 마련함에 의한다.As a technical configuration for achieving the above object, the present invention, the first dam is installed in the tundish so that the bottom is located above the bottom of the tundish, and the bottom having a hole for discharging molten steel in the bottom of the tundish In the molten steel flow induction tundish dam consisting of a second dam located closer to the molten steel outlet side than the first dam, the second dam is formed with an inclined surface closer to the molten steel outlet toward the top of the first dam side By providing a tundish dam for inducing molten steel flow.

이하, 본 발명의 실시예를 첨부된 도면에 의거하여 보다 상세하게 설명한다.Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

도4는 본 발명에 따른 턴디쉬 댐이 설치된 턴디쉬가 전체적으로 도시된 구성도로서, 턴디쉬(10)의 내부에 제1댐(20)가 제2댐(30)이 설치되고, 상기 제1댐(20)은 하단이 턴디쉬(10)의 바닥보다 상부에 위치되도록 롱 노즐(130)과 용강 배출구(12) 사이에 고정 설치되고, 상기 제2댐(30)은 하단이 턴디쉬(10)의 바닥에 위치되고 상기 제1댐(20)보다 용강 배출구(12)쪽에 더 가깝게 위치되도록 고정 설치된다. 또한, 상기 제2댐(30)의 하단부에는 도4에 도시된 바와 같이 용강 잔탕을 통과시킬 수 있도록 구멍(34)이 형성된다.4 is a configuration diagram showing a tundish dam having a tundish dam according to the present invention as a whole, wherein a first dam 20 is provided with a second dam 30 inside the tundish 10, and the first dam is installed. The dam 20 is fixedly installed between the long nozzle 130 and the molten steel outlet 12 so that the bottom thereof is positioned above the bottom of the tundish 10, and the second dam 30 has a tundish 10 at the bottom thereof. Located at the bottom of the) and fixed to be located closer to the molten steel outlet 12 side than the first dam (20). In addition, a hole 34 is formed at a lower end of the second dam 30 so as to allow molten steel residual water to pass through as shown in FIG. 4.

상기 제1댐(20)은 종래의 제1댐(114)과 대략 유사하게 보이며, 다만 그 상단의 높이가 용강의 상면보다 더 높게 상부로 연장 형성된다.The first dam 20 looks substantially similar to the conventional first dam 114, except that the upper end of the first dam 20 extends higher than the upper surface of the molten steel.

상기 제2댐(30)은 제1댐(20)쪽 표면이 상부로 갈수록 용강 배출구(12)쪽으로 가까워지는 경사면(32)으로 형성되고, 상기 제2댐(30)의 하단에 형성되는 구멍(34)의 크기를 종래에 비하여 작게 설정하여 턴디쉬(10)의 폭 방향으로 다수개소에 구비시킨다.The second dam 30 is formed as an inclined surface 32 that is closer to the molten steel outlet 12 toward the upper side of the first dam 20, the hole formed in the lower end of the second dam 30 ( The size of 34 is set smaller than in the prior art and provided at a plurality of places in the width direction of the tundish 10.

물론, 상기 제2댐(30)의 경사면(32)이 갖는 경사 크기를 특별하게 한정하지는 않는바, 이는 상기 경사면(32)이 갖는 경사 크기가 여러 가지 요인들에 의해 턴디쉬 설비마다 다르게 형성될 것이기 때문이다. 따라서, 수모델 등에 의한 실험이나 계산 등에 의해 턴디쉬 설비의 각각에 적합한 경사면(32)의 경사 정도를 결정하여야 한다.Of course, the size of the inclination of the inclined surface 32 of the second dam 30 is not particularly limited, and the inclination size of the inclined surface 32 may vary depending on various tundish facilities due to various factors. Because it is. Therefore, the degree of inclination of the inclined surface 32 suitable for each tundish facility should be determined by experiments or calculations by a number model or the like.

또한, 상기 제1댐(20)과 제2댐(30) 사이의 거리를 종래에 비하여 보다 작게 설정한다.In addition, the distance between the first dam 20 and the second dam 30 is set smaller than in the prior art.

이하, 본 발명의 작용을 설명한다.The operation of the present invention will be described below.

우선, 제1댐(20)의 상단 높이가 턴디쉬(10)내 용강의 상면 높이보다 더 높게 형성됨으로써, 롱 노즐(130)측 용강과 슬라그가 제1댐(20)을 넘어 용강 배출구(12)쪽으로 이동되는 것이 차단된다.First, since the upper end height of the first dam 20 is higher than the upper surface height of the molten steel in the tundish 10, the molten steel and the slag on the long nozzle 130 side cross the first dam 20, and the molten steel outlet 12 Movement toward) is blocked.

따라서, 슬라그가 용강 배출구(12)를 통해 배출되어 슬라브의 품질을 저하시키는 것이 예방된다.Thus, the slag is discharged through the molten steel outlet 12 to prevent the slab quality is lowered.

다음에, 제1댐(20)의 하부를 통해 제2댐(30)쪽으로 흐르던 용강이 제2댐(30)의 경사면(32)에 충돌되면서 상향되는 경로로 진행하여 제1댐(20)과 제2댐(30) 사이의 공간에서 반전류 없이 원활한 피스톤플로우(Piston flow)가 유발됨으로써 용강내에 존재하는 개재물들이 보다 용이하게 용강 상부로 부상 분리될 수 있게 한다.Next, the molten steel flowing toward the second dam 30 through the lower portion of the first dam 20 collides with the inclined surface 32 of the second dam 30 and moves upward. A smooth piston flow is induced in the space between the second dams 30 without reverse flow, so that the inclusions in the molten steel can be more easily separated from the upper portion of the molten steel.

또한, 제2댐(116)의 하단에 턴디쉬(10)의 폭방향으로 다수개 분할하여 형성된 구멍(117)은 종래에 비하여 그 크기가 작게 형성되는바, 이는 제1댐(20)의 하부를 통해 상기 구멍(117)으로 흐르는 용강의 양이 줄어듬은 물론 그 속도도 떨어지기 때문에 이 구멍(117)을 통해 흐르는 용강이 상기 피스톤플로우에 의해 용강 상면쪽으로 부상하는 것이다.In addition, the holes 117 formed by dividing a plurality of holes in the width direction of the tundish 10 at the lower end of the second dam 116 are smaller in size than the conventional ones, which is a lower portion of the first dam 20. Since the amount of molten steel flowing through the hole 117 is reduced as well as the speed is lowered, the molten steel flowing through the hole 117 floats toward the upper surface of the molten steel by the piston flow.

게다가, 상기 제1댐(20)과 제2댐(30)의 간격이 종래에 비하여 더 작게 설정됨에 의하여 상기 피스톤플로우가 보다 수직하게 형성되는데 도움이 된다.In addition, since the distance between the first dam 20 and the second dam 30 is set smaller than in the related art, it helps to form the piston flow more vertically.

상술한 바와 같이 본 발명에 따른 용강 흐름 유도용 턴디쉬 댐에 의하면, 제1댐의 상단 높이가 턴디쉬내 용강의 상면 높이보다 더 높게 형성됨으로써 슬라그가 제1댐을 넘어 용강 배출구를 통해 배출되는 방지되고 슬라브의 품질을 저하시키는 것이 예방된다.As described above, according to the molten steel flow guide tundish dam according to the present invention, the top height of the first dam is formed higher than the top surface of the molten steel in the tundish, so that the slag is discharged through the molten steel outlet through the first dam. And to deteriorate the quality of the slabs.

또한, 제2댐에 제1댐쪽으로 경사면을 형성시킴으로써 제1댐과 제2댐 사이의 공간에서 반전류 없이 피스톤플로우가 형성되어 용강내에 존재하는 개재물의 부상 분리가 효과적으로 이루어진다.In addition, by forming an inclined surface toward the first dam in the second dam, a piston flow is formed in the space between the first dam and the second dam without reverse flow, so that floating separation of inclusions existing in the molten steel is effectively performed.

또한, 제2댐의 하단에 턴디쉬의 폭방향으로 다수개 분할하여 용강 잔탕 통과용 구멍이 형성됨에 의하여 제2댐의 하부를 통해 용강 배출구로 직접 배출되는 용강의 양을 작게 하여 용강중에 포함된 개재물 분리에 도움이 된다.In addition, by dividing a plurality of holes in the width direction of the tundish at the bottom of the second dam to form a hole for molten steel after-treatment, the amount of molten steel directly discharged to the molten steel outlet through the lower portion of the second dam is reduced. It helps to separate inclusions.

Claims (4)

하단이 턴디쉬의 바닥 보다 상부에 위치되도록 턴디쉬에 설치된 제1댐(20)과, 용강 잔탕 배출용 구멍을 갖는 하단이 턴디쉬의 바닥에 위치되고 상기 제1댐(20)보다 용강 배출구 쪽에 가깝게 위치된 제2댐으로 이루어진 용강 흐름 유도용 턴디쉬 댐에 있어서,The first dam 20 installed in the tundish so that the lower end is located above the bottom of the tundish, and the lower end having a hole for discharging molten steel is located at the bottom of the tundish and is located closer to the molten steel outlet than the first dam 20. In the molten steel flow induction tundish dam consisting of a second dam located in close proximity, 상기 제2댐(30)은 제1댐(20)쪽 표면이 상부로 갈수록 용강 배출구 쪽으로 가까워지는 경사면(32)으로 형성됨을 특징으로 하는 용강 흐름 유도용 턴디쉬 댐.The second dam (30) is a tundish dam for induction of molten steel flow, characterized in that the first dam 20 is formed with an inclined surface (32) closer to the molten steel outlet toward the upper side. 제1항에 있어서, 상기 제2댐(30)의 용강 잔탕 배출용 구멍(34)은 폭방향에 대하여 다수개로 형성됨을 특징으로 하는 용강 흐름 유도용 턴디쉬 댐.The molten steel flow guide tundish dam according to claim 1, characterized in that a plurality of molten steel residual water discharge holes (34) of the second dam (30) are formed in the width direction. 제1항에 있어서, 상기 제1댐(20)은 상단이 턴디쉬(10)의 용강 상면보다 더 높게 위치됨을 특징으로 하는 용강 흐름 유도용 턴디쉬 댐.2. The tundish dam for inducing molten steel flow according to claim 1, wherein the first dam (20) is positioned at an upper end of the first dam (20). 제1항 내지 제3항의 어느 한 항에 있어서, 상기 제1댐(20)과 제2댐(30)은 이들 제1댐(20)과 제2댐(30) 사이를 통해 흐르는 용강을 용강 상면 부근까지 유도시키도록 근접되게 배치시킴을 특징으로 하는 용강 흐름 유도용 턴디쉬 댐.4. The upper surface of the molten steel according to any one of claims 1 to 3, wherein the first dam 20 and the second dam 30 pass molten steel flowing between the first dam 20 and the second dam 30. A tundish dam for inducing molten steel flow, characterized in that it is arranged in close proximity to guide the vicinity.
KR1020010075401A 2001-11-30 2001-11-30 Tundish dam for guiding molten iron KR20030044589A (en)

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CN111318682A (en) * 2020-04-01 2020-06-23 湖北金盛兰冶金科技有限公司 Tundish structure for square billet continuous casting and casting blank purity analysis process
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CN101869970A (en) * 2010-05-31 2010-10-27 莱芜钢铁集团有限公司 Continuous casting tundish slag blocking wall of composite material and production technology
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EP3725430A4 (en) * 2017-12-11 2020-12-30 Posco Molten material processing device
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KR20210055359A (en) 2019-11-07 2021-05-17 주식회사 포스코 Processing apparatus and method for molten material
CN111318682A (en) * 2020-04-01 2020-06-23 湖北金盛兰冶金科技有限公司 Tundish structure for square billet continuous casting and casting blank purity analysis process

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