WO2013039279A1 - Shroud nozzle shaking preventing technique - Google Patents

Shroud nozzle shaking preventing technique Download PDF

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Publication number
WO2013039279A1
WO2013039279A1 PCT/KR2011/008587 KR2011008587W WO2013039279A1 WO 2013039279 A1 WO2013039279 A1 WO 2013039279A1 KR 2011008587 W KR2011008587 W KR 2011008587W WO 2013039279 A1 WO2013039279 A1 WO 2013039279A1
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Prior art keywords
shroud
nozzle
shroud nozzle
molten steel
shaking
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PCT/KR2011/008587
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French (fr)
Korean (ko)
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김기환
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Kim Gihwan
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Publication of WO2013039279A1 publication Critical patent/WO2013039279A1/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
    • 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
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to a nozzle for transferring molten steel from a ladle to a tundish in a continuous casting process during steelmaking of an ironworks, and more particularly, a shroud nozzle, which is a functional refractory resistant to high temperatures, is broken by vibration when connecting a ladle. It relates to a technique for preventing.
  • a shroud nozzle that is a refractory connecting a ladle and a tundish has one discharge port and a nozzle having a straight structure has been used.
  • the nozzle opens the slide gate on the molten steel of the tundish when the ladle is connected, so that the nozzle does not shake even when there is a sudden flow of molten steel.
  • oxygen in the atmosphere is mixed into the molten steel to cause reoxidation of the molten steel and bubble defects on the product.
  • demand for higher purity products has been demanded.
  • the present invention is to solve the above problems of the prior art, to smoothly relieve the pressure in the shroud nozzle when opening the slide gate of the ladle to prevent the shaking of the shroud nozzle to prevent the breakage of the nozzle, the object is have.
  • the present invention provides a lower inner shroud nozzle with an inner diameter of 108 mm, an outer diameter of 190 mm, a total length of 15350 mm, an inner diameter of the lower light type of 180 mm, an outer diameter of 230 mm, and a length of the lower light type part. 585 mm, perforating the pressure relief hole of ⁇ 30 in four directions at a point 200 mm upward from the lower end of the nozzle.
  • the present invention is a conventional downlight shroud nozzle with an upper inner diameter of 108 mm, an outer diameter of 190 mm, a total length of 1535 mm, an inner diameter of the lower light type of 180 mm, an outer diameter of 230 mm, and a length of the lower light type part of 585 mm.
  • the camcorder was installed on four sides vertically around the shroud nozzle of the tundish, and then the image was captured by a computer and the shaking angle was measured.
  • 1 is an example of installation of an apparatus for measuring the degree of shaking of the shroud nozzle. Through this apparatus, the shaking angle ⁇ of the shroud nozzle was measured at various angles.
  • Table 1 shows the results of analyzing the shake angle ⁇ before the invention by the above method.
  • the lower part of the lower part of the lower shroud nozzle precisely below the molten steel below the slag line of the tundish, drills a ⁇ 30 hole in 4 directions (90 °) or 3 directions (120 °) to eliminate the sudden pressure load. The shaking of the nozzle was prevented.
  • the height of the drilled hole should be the same four or three, the size is also preferred. It is preferable that the drilling position is deposited in the molten steel while being below the slag line of the tundish. If the perforated hole is caught in the slag line, the slag may be mixed into the molten steel according to the Bernoulli principle according to the melt flow pressure in the shroud nozzle after the pressure is released. Instead, oxygen in the atmosphere can be incorporated to promote the reoxidation of molten steel.
  • the shape of the hole may be oval or square, round and polygon may be applied.
  • the diameter of the hole is also preferably 5mm to 70mm, but more than 70mm is not preferable because the molten steel flows out even after the pressure is released and the molten steel flows out in the tundish.
  • Table 2 shows the results analyzed through this example.
  • the neck portion of the nozzle can be minimized and eliminated by shaking after the shroud nozzle is connected, and the hot molten steel is not stagnant in the shroud and is smoothly transported to the tundish to rest. Partial damage to the wood can be prevented and the life of the nozzle can be prolonged, so the number of lead times can be increased.
  • FIG. 1 is an installation diagram of a detector (camera for photographing a video) for measuring the shaking of a wide shroud nozzle.
  • FIG. 2 is a flow chart of measuring the shaking of the shroud nozzle after capturing a photograph taken on a computer and printing on a transparent paper.
  • FIG. 3 is a specific illustration of the present invention.
  • FIG. 4 is an exemplary view of measuring a shaking angle.
  • Table 1 below is a result of measuring the shaking angle when using the conventional shroud nozzle 10 times. As shown in the results, the degree of tremor is about 20 to 30 °. The top of the shroud nozzle is fixed to the ladle, which causes the tremors to break just below the bar of the most vulnerable shroud nozzle.
  • Table 2 measured the shaking angle when using a shroud nozzle in which four holes of ⁇ 30 were drilled in a 90 ° direction at 200 mm from the bottom of the nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The present invention relates to a nozzle for sending molten steel from a ladle to a tundish in the continuous casting process of a steel-making process in a foundry, and, more specifically, to a technique for preventing the shroud nozzle, which is a functional refractory article that withstands high temperatures, from breaking due to vibration during ladle coupling. A feature of the present invention is that, when the air inside the shroud suddenly escapes as the ladle is attached, shaking of the shroud nozzle is prevented as pressure-relieving holes are made in 4 directions or 3 directions in the place of immersion of the shroud nozzle which gets larger towards the bottom. Here, it is essential that the holes made in this way are immersed into the molten steel below the slag line. According to the present invention, when the shroud nozzle is attached, not only is it possible to prevent shaking of the nozzle but also it is smoothly sent into the tundish without stagnation of the high-temperature molten steel within the shroud nozzle, and thus there is the advantage that shroud nozzle melting losses are reduced and consequently there is the advantage that breaking of the shroud nozzle can be stopped and the number of continuous castings can be increased.

Description

쉬라우드 노즐 떨림 방지 기술.Shroud nozzle anti-shake technology.
본 발명은 제철소의 제강공정 중 연속주조공정상에서 레이들로부터 턴디쉬로 용강을 이송되는 노즐에 관한 것으로, 보다 상세하게는 고온에 견디는 기능성내화물인 쉬라우드 노즐이 레이들 연결 시 진동에 의하여 깨지는 것을 방지하기 위한 기술에 관한 것이다.The present invention relates to a nozzle for transferring molten steel from a ladle to a tundish in a continuous casting process during steelmaking of an ironworks, and more particularly, a shroud nozzle, which is a functional refractory resistant to high temperatures, is broken by vibration when connecting a ladle. It relates to a technique for preventing.
일반적으로 레이들과 턴디쉬를 잇는 역할을 하는 내화물인 쉬라우드 노즐은 1개의 토출구를 가지며 일자형의 구조를 가진 노즐이 사용되어 왔다. 통상적으로 이 노즐은 레이들 연결시 턴디쉬의 용강위에서 슬라이드 게이트의 개공을 하므로 갑작스런 용강의 흐름에도 노즐의 떨림이 발생하지 않았다. 이 방법은 노즐의 막힘이나 떨림은 없는 반면, 대기중의 산소등이 용강내로 혼입되어 용강의 재산화 및 제품상에 기포성 결함을 유발하기도 한다. 그러나 최근에 자동차용 외판재 생산이 상용화 되면서 더욱 고순도의 제품을 수요가가 요구하게 되었고, 어떠한 외부요인에 의하여도 개재물(介在物)의 혼입을 막기 위하여 이 노즐을 턴디쉬의 용강속에 침적한 후에 레이들의 슬라이드 게이트를 개공하는 방식을 사용하기에 이르렀다. 그러나 이 방법은 쉬라우드 노즐내에 차 있는 공기가 레이들로부터의 용강에 의하여 밀리면서 턴디쉬 용강면에서 압력이 해소되는 과정에서 턴디쉬의 용강면을 요동치게 하고 이는 쉬라우드 노즐의 떨림을 유발하여 쉬라우드 노즐의 목부위가 절손되는 경우가 많아졌다. 그래서 현재는 쉬라우드의 형상이 하부가 넓은 하광형을 사용하나 역시나 노즐내의 압력이 해소되는 과정에서 큰 떨림이 발생되고 있으며, 이로 인하여 노즐 목부위가 여전히 절손되는 경우가 많이 발생하고 있다.In general, a shroud nozzle that is a refractory connecting a ladle and a tundish has one discharge port and a nozzle having a straight structure has been used. Normally, the nozzle opens the slide gate on the molten steel of the tundish when the ladle is connected, so that the nozzle does not shake even when there is a sudden flow of molten steel. In this method, there is no clogging or shaking of the nozzle, but oxygen in the atmosphere is mixed into the molten steel to cause reoxidation of the molten steel and bubble defects on the product. However, as the production of automotive exterior panels has recently become commercialized, demand for higher purity products has been demanded. After the nozzles were deposited in the molten steel of the tundish to prevent the incorporation of inclusions by any external factors, The method of opening the slide gate of the ladle has been used. However, this method causes the air filled in the shroud nozzle to be pushed by the molten steel from the ladle, causing the tumbled molten steel to swing as the pressure is released from the tundish molten steel, which causes the shroud nozzle to shake. The neck of the shroud nozzle is often broken. Therefore, the shroud has a lower shape of a wider lower shroud. However, a large tremor occurs in the process of releasing the pressure in the nozzle, which causes a lot of cases where the nozzle neck is still broken.
본 발명은 상기의 종래기술의 문제점을 해결하기 위한 것으로, 레이들의 슬라이드 게이트 개공시 쉬라우드 노즐내의 압력을 원활하게 해소하게 함으로써 쉬라우드 노즐의 떨림을 방지하여 노즐의 절손을 방지하는데, 그 목적이 있다.The present invention is to solve the above problems of the prior art, to smoothly relieve the pressure in the shroud nozzle when opening the slide gate of the ladle to prevent the shaking of the shroud nozzle to prevent the breakage of the nozzle, the object is have.
상기 목적을 달성하기 위한 본 발명은, 하광형 쉬라우드 노즐로써 상부 내경이 108mm, 외경이 190mm이며, 총 길이가 15350mm이며, 하광형의 내경이 180mm, 외경이 230mm 이며, 하광형 부분의 길이가 585mm이며, 노즐의 하단부로부터 상부방향으로 200mm 지점에 4방향으로 Ø30 의 압력 해소용 구멍을 뚫는 것에 관한 것이다.In order to achieve the above object, the present invention provides a lower inner shroud nozzle with an inner diameter of 108 mm, an outer diameter of 190 mm, a total length of 15350 mm, an inner diameter of the lower light type of 180 mm, an outer diameter of 230 mm, and a length of the lower light type part. 585 mm, perforating the pressure relief hole of Ø30 in four directions at a point 200 mm upward from the lower end of the nozzle.
이하, 본 발명을 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명은 통상적인 하광형 쉬라우드 노즐로써 상부 내경이 108mm, 외경이 190mm이며, 총 길이가 1535mm이며, 하광형의 내경이 180mm, 외경이 230mm 이며, 하광형 부분의 길이가 585mm로 구성된다.The present invention is a conventional downlight shroud nozzle with an upper inner diameter of 108 mm, an outer diameter of 190 mm, a total length of 1535 mm, an inner diameter of the lower light type of 180 mm, an outer diameter of 230 mm, and a length of the lower light type part of 585 mm.
본 발명에서는 상기한 하광형 쉬라우드 노즐이 레이들의 슬라이드 게이트 개공시 얼마나 많이 떨림이 있는지를 평가하고자 하였다.In the present invention, it was intended to evaluate how much the above-mentioned light shroud nozzles were shaken when opening the slide gate of the ladle.
이를 위하여 턴디쉬의 쉬라우드 노즐 주변 수직으로 4면에 캠코더를 설치하였고, 이후에 영상을 컴퓨터에서 캡쳐하여 떨림각을 측정하였다. 도 1은 쉬라우드 노즐이 떨리는 정도를 측정하기 위한 장치의 설치예이다. 본 장치를 통하여 여러 각도에서 쉬라우드 노즐의 떨림각(θ)을 측정하였다.For this purpose, the camcorder was installed on four sides vertically around the shroud nozzle of the tundish, and then the image was captured by a computer and the shaking angle was measured. 1 is an example of installation of an apparatus for measuring the degree of shaking of the shroud nozzle. Through this apparatus, the shaking angle θ of the shroud nozzle was measured at various angles.
표 1은 상기한 방법에 의하여 발명전의 떨림각(θ)을 분석한 결과이다.Table 1 shows the results of analyzing the shake angle θ before the invention by the above method.
마찬가지로, 하광형 쉬라우드 노즐의 하광형 부분, 정확히는 턴디쉬의 슬라그 라인 아래의 용강면보다 아래에 4방향(90°) 또는 3방향(120°)으로 Ø30의 구멍을 뚫어 갑작스런 압력부하를 해소하여 노즐의 떨림을 방지하였다.Likewise, the lower part of the lower part of the lower shroud nozzle, precisely below the molten steel below the slag line of the tundish, drills a Ø30 hole in 4 directions (90 °) or 3 directions (120 °) to eliminate the sudden pressure load. The shaking of the nozzle was prevented.
이때 뚫는 구멍의 높이는 4개 또는 3개가 동일해야 하며, 크기 또한 동일한 것이 바람직하다. 천공위치는 턴디쉬의 슬라그 라인보다 아래에 있으면서 용강에 침적되어 있는 것이 바람직하다. 천공된 구멍이 슬라그 라인에 걸려 있을 경우 압력이 해소된 이후에 쉬라우드 노즐내의 용강흐름 압력에 따라서 베르누이 원리에 의하여 슬라그가 용강중으로 혼입될 수 있으며, 슬라그 라인보다 위에 있을 경우는 마찬가지로 슬라그 대신 대기중 산소가 혼입되어 용강의 재산화를 촉진 할 수가 있다.At this time, the height of the drilled hole should be the same four or three, the size is also preferred. It is preferable that the drilling position is deposited in the molten steel while being below the slag line of the tundish. If the perforated hole is caught in the slag line, the slag may be mixed into the molten steel according to the Bernoulli principle according to the melt flow pressure in the shroud nozzle after the pressure is released. Instead, oxygen in the atmosphere can be incorporated to promote the reoxidation of molten steel.
또한, 구멍의 형상은 타원형이거나 사각형, 원형 및 다각형을 모두 적용할 수 있다. 구멍의 직경 또한 5mm에서 70mm까지는 바람직하나 70mm 이상은 압력해소와 동시에 압력이 해소된 이후에도 용강이 흘러 나오므로 턴디쉬내의 용강흐름을 바꿀 수 있어 바람직하지 않다.In addition, the shape of the hole may be oval or square, round and polygon may be applied. The diameter of the hole is also preferably 5mm to 70mm, but more than 70mm is not preferable because the molten steel flows out even after the pressure is released and the molten steel flows out in the tundish.
이 실시예를 통하여 분석된 결과를 표 2에 나타내었다.Table 2 shows the results analyzed through this example.
이하, 이 실시예를 통하여 본 발명을 보다 상세하게 설명하나, 이러한 실시예의 기재는 본 발명의 실시를 예시하기 위한 것일 뿐 이러한 실시예의 기재에 의하여 본 발명이 제한되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to these examples, but the description of these examples is merely to illustrate the practice of the present invention, and the present invention is not limited by the description of these examples.
상술한 바와 같이, 본 발명에 따르면 쉬라우드 노즐 연결 후 떨림에 의하여 노즐의 목부위 절손을 최소화 및 없앨 수 있으며 뿐만 아니라 고온의 용강이 쉬라우드 내부에 정체되어 있지 않고 원활하게 턴디쉬로 이송됨으로써 쉬라우드의 부분 용손을 막을 수 있어 노즐의 수명을 연장시킬 수 있으므로 연연주수를 늘릴 수 있다.As described above, according to the present invention, the neck portion of the nozzle can be minimized and eliminated by shaking after the shroud nozzle is connected, and the hot molten steel is not stagnant in the shroud and is smoothly transported to the tundish to rest. Partial damage to the wood can be prevented and the life of the nozzle can be prolonged, so the number of lead times can be increased.
도 1은 광폭형 쉬라우드 노즐의 떨림을 측정하기 위한 디텍터(동영상 촬영용 카메라)의 설치도이다.1 is an installation diagram of a detector (camera for photographing a video) for measuring the shaking of a wide shroud nozzle.
도 2는 촬영된 사진을 컴퓨터에서 캡쳐하여 투명용지에 프린트한 후 쉬라우드 노즐의 떨림을 측정하는 흐름도이다.2 is a flow chart of measuring the shaking of the shroud nozzle after capturing a photograph taken on a computer and printing on a transparent paper.
도 3은 본 발명의 구체적인 예시도이다.Figure 3 is a specific illustration of the present invention.
도 4는 떨림각을 측정하는 예시도이다.4 is an exemplary view of measuring a shaking angle.
하기 표 1은 기존의 쉬라우드 노즐을 이용할 때의 떨림각도를 10회 측정한 결과이다. 결과에서 보듯이 떨림의 정도는 약 20 ~ 30°를 움직인다. 쉬라우드 노즐 상부는 레이들에 고정되어 있어서 이 떨림에 의하여 가장 취약한 쉬라우드 노즐의 철피 바로 아래가 절손되었다 Table 1 below is a result of measuring the shaking angle when using the conventional shroud nozzle 10 times. As shown in the results, the degree of tremor is about 20 to 30 °. The top of the shroud nozzle is fixed to the ladle, which causes the tremors to break just below the bar of the most vulnerable shroud nozzle.
표 1
측정횟수 1 2 3 4 5 6 7 8 9 10
떨림각(°) ±11 ±15 ±13 ±16 ±12 ±10 ±14 ±16 ±15 ±13
Table 1
Number of measurements One 2 3 4 5 6 7 8 9 10
Tremor angle (°) ± 11 ± 15 ± 13 ± 16 ± 12 ± 10 ± 14 ± 16 ± 15 ± 13
다음으로 표 2는 노즐의 하단으로부터 200mm 지점에 90 °방향으로 Ø30의 구멍 4개를 뚫은 쉬라우드 노즐을 이용할 때의 떨림 각도를 측정하였다.Next, Table 2 measured the shaking angle when using a shroud nozzle in which four holes of Ø30 were drilled in a 90 ° direction at 200 mm from the bottom of the nozzle.
결과는 떨림각이 0 ~ 2°로 거의 발생되지 않았고 이로써 쉬라우드 노즐의 절손이 발생하지 않은 개선효과를 나타내었다.The results showed that the shaking angle was hardly generated at 0 to 2 °, thereby improving the shroud nozzle.
표 2
측정횟수 1 2 3 4 5 6 7 8 9 10
떨림각(°) ±1 0 0 ±1 0 ±1 0 ±1 0 0
TABLE 2
Number of measurements One 2 3 4 5 6 7 8 9 10
Tremor angle (°) ± 1 0 0 ± 1 0 ± 1 0 ± 1 0 0
떨림각 분석을 위한 최선의 형태는 [도 1]과 같이 하며, 바람직한 쉬라우드 노즐의 모양은 [도 3]과 같이 제조하여 실시한다.The best form for the analysis of the shake angle is as shown in Figure 1, the shape of the preferred shroud nozzle is carried out by manufacturing as shown in FIG.
제철소의 제강공정 중 연속주조공정에서 최종 제품을 생산할 때 대기 중 노출을 제거할 수 있어서 용강의 재산화를 막을 수 있다. 또한 쉬라우드 노즐 절손에 의한 조업 위험 요소를 제거할 수 있는 곳에 적용이 가능하다.When producing the final product in the continuous casting process of the steelmaking process of the steelworks, it is possible to eliminate the exposure to the atmosphere, which can prevent the reoxidation of molten steel. It is also applicable where the risk of operation due to shroud nozzle loss can be eliminated.

Claims (5)

  1. 쉬라우드 노즐의 형상이 하광형이면서 침적형인 것에 슬라그 라인 아래 압력 해소용 구멍을 천공하여 쉬라우드 노즐의 떨림을 방지하는 기술.The shroud nozzle is a light-type and immersion type, and a technology to prevent the shroud nozzle from shaking by drilling a pressure relief hole under the slag line.
  2. 쉬라우드 노즐의 형상이 일자형이면서 침적형인 것에 슬라그 라인 아래 압력해소용 구멍을 천공하여 쉬라우드 노즐의 떨림을 방지하는 기술.The shroud nozzles are straight and immersed, and the technology to prevent the shroud nozzles from shaking by drilling a pressure relief hole under the slag line.
  3. 직경이 5mm에서 70mm까지의 압력 해소용 구멍을 천공하여 쉬라우드 노즐의 떨림을 방지하는 기술.A technology to prevent the shroud of the shroud nozzle by drilling a pressure relief hole with a diameter of 5mm to 70mm.
  4. 천공된 구멍을 타원형이거나 사각형 또는 다각형으로 하여 압력을 해소하는 쉬라우드 노즐의 떨림을 방지하는 기술.A technique for preventing the shaking of shroud nozzles that releases pressure by making the perforated holes oval, square or polygonal.
  5. 천공의 각도를 90° 또는 120°로 하여 압력을 해소하는 쉬라우드 노즐의 떨림을 방지하는 기술.A technology that prevents shaking of shroud nozzles that relieve pressure by setting the angle of drilling to 90 ° or 120 °.
PCT/KR2011/008587 2011-09-16 2011-11-10 Shroud nozzle shaking preventing technique WO2013039279A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0093360 2011-09-16
KR1020110093360A KR20110108326A (en) 2011-09-16 2011-09-16 The technology of vibrating protection of shroud nozzle when change the ladle at continuous casting

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WO2013039279A1 true WO2013039279A1 (en) 2013-03-21

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6130268A (en) * 1984-07-19 1986-02-12 Nippon Steel Corp Long nozzle for continuous casting
KR900001783Y1 (en) * 1986-12-31 1990-03-05 포항종합제철주식회사 Long nozzle for continuos casting
JPH0866751A (en) * 1994-08-29 1996-03-12 Nippon Steel Corp Continuous casting method and immersion nozzle
KR20120044430A (en) * 2010-10-28 2012-05-08 현대제철 주식회사 Shroud nozzle for continuous casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6130268A (en) * 1984-07-19 1986-02-12 Nippon Steel Corp Long nozzle for continuous casting
KR900001783Y1 (en) * 1986-12-31 1990-03-05 포항종합제철주식회사 Long nozzle for continuos casting
JPH0866751A (en) * 1994-08-29 1996-03-12 Nippon Steel Corp Continuous casting method and immersion nozzle
KR20120044430A (en) * 2010-10-28 2012-05-08 현대제철 주식회사 Shroud nozzle for continuous casting

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