KR100333077B1 - Nozzle for uniformly supplying molten steel in continuous casting line - Google Patents

Nozzle for uniformly supplying molten steel in continuous casting line Download PDF

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KR100333077B1
KR100333077B1 KR1019970074234A KR19970074234A KR100333077B1 KR 100333077 B1 KR100333077 B1 KR 100333077B1 KR 1019970074234 A KR1019970074234 A KR 1019970074234A KR 19970074234 A KR19970074234 A KR 19970074234A KR 100333077 B1 KR100333077 B1 KR 100333077B1
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South Korea
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molten steel
nozzle
discharge port
continuous casting
width
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KR1019970074234A
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Korean (ko)
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KR19990054420A (en
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정성인
이철규
하만진
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주식회사 포스코
재단법인 포항산업과학연구원
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Priority to KR1019970074234A priority Critical patent/KR100333077B1/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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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

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

Abstract

PURPOSE: A nozzle for uniformly supplying molten steel in a continuous casting line is provided to remove congestion zone of molten steel and uniformly grow solidification shell by uniformly supplying molten steel into general mold and twin roll, and improve quality of slab by restraining concentration of impurities on the surface of molten metal. CONSTITUTION: In a rectangular nozzle(7) for continuous casting line which is formed in a rectangular parallelopiped shape as a whole, and on the side wall of which a plurality of discharge ports are formed, the nozzle for uniformly supplying molten steel in a continuous casting line is characterized in that the nozzle is formed in such a manner that height of an external form is at least the same as or more than immersion depth of the discharge ports, width of each side wall is at least the same as or more than width of one discharge port, each of discharge ports has 20 degrees or more of horizontal direction angle (α), 3 to 100 mm of width (W) and 5 to 100 mm of height (H), a distance (S) between each of the discharge ports is 10 mm or more, and immersion depth (SH) of the discharge ports is 10 to 100 mm.

Description

연속주조 장치에서의 용강 균일공급 노즐Molten steel uniform supply nozzle in continuous casting device

본 발명은 일반주형과 쌍롤에 용강을 공급할 때 용강공급을 균일하게 하여 용강의 정체구역을 없애고, 응고쉘의 성장을 균일하게 하며, 용탕표면의 불순물 집중현상을 억제함으로써 주편의 품질을 향상시킬 수 있도록한 연속주조장치에서의 용강 균일공급 노즐에 관한 것이다.According to the present invention, when supplying molten steel to a general mold and a double roll, the molten steel is uniformly eliminated, thus eliminating the stagnation zone of the molten steel, making the growth of the solidification shell uniform, and suppressing the concentration of impurities on the surface of the molten metal, thereby improving the quality of the cast steel. It relates to a molten steel uniform supply nozzle in a continuous casting device.

일반적으로 박판주조장치는 도 1에 도시된 바와 같이 레들에서 노즐(1)을 통하여 턴디쉬로 공급되고 이 턴디쉬에서는 노즐을 통하여 쌍롤(2)의 사이 용탕풀에 용강을 공급한 후 상기 쌍롤의 각기 다른(반대방향) 회전에 의하여 박판(3)이 생산된다.In general, the sheet casting apparatus is supplied to the tundish through the nozzle (1) in the ladle as shown in FIG. 1, in which the molten steel is supplied to the molten pool between the two rolls (2) through the nozzle, The thin plates 3 are produced by different (counter) rotations.

단 상기 쌍롤은 내부로 냉각수가 흐르면서 냉각을 시켜줌으로 용강을 응고시킨다.However, the pair of rolls solidify the molten steel by allowing the cooling water to flow therein.

이와 같은 과정중 상기 턴디쉬에서 롤(2)의 사이 용탕풀로 용강을 공급하는 노즐(1)은 도 2a,b 및 도 3a,b에서 도시된 바와 같이 원통형의 노즐(5)이나 직사각형의 노즐(7)로 제작되어 있고, 이의 토출구(6)(8)(9)들은 도 3a,b에서 도시된 바와같이 수평으로 다수개 형성되어 있어 용강이 수직으로 주입되게 되어 있다.In this process, the nozzle 1 for supplying molten steel from the tundish to the molten steel between the rolls 2 may be a cylindrical nozzle 5 or a rectangular nozzle as shown in FIGS. 2A, 2B and 3A, 2B. (7), and the discharge ports 6, 8 and 9 thereof are formed horizontally as shown in Figs. 3A and 3B so that molten steel is injected vertically.

따라서 이러한 경우에는 토출구(6)(8)가 형성되어 있는 곳과 형성되어 있지않은 곳의 용강공급이 불균일하여 정체구역이 발생함으로 온도편차가 심하게 발생하고, 도 4에서 도시된 바와 같이 응고쉘(11)의 성장 방향으로 용강이 공급됨에 따라 응고쉘(11)이 국부적으로 성장하는 문제가 있다.Therefore, in such a case, the temperature difference is severely generated due to the non-uniformity of supply of molten steel in the places where the discharge ports 6 and 8 are formed and the formation of the stagnation zone, and as shown in FIG. As the molten steel is supplied in the growth direction of 11), there is a problem that the solidification shell 11 grows locally.

또한 용강이 토출되는 방향이 좌우로 나누어져 공급됨에 따라 정체구역이나 때로는 용강의 흐름이 서로 만나게 되어 용강표면에 부유하던 불순물들이 한 곳으로 집중되는 문제점이 있다.In addition, since the direction in which the molten steel is discharged is divided into left and right, the flow of the stagnant zone or sometimes the molten steel meets each other, so that impurities floating on the surface of the molten steel are concentrated in one place.

본 발명은 상기와 같은 제반 문제점을 감안하여 이를 해소하고자 발명한 것으로 노즐의 토출구 방향을 한 방향으로 일정한 각도를 갖도록 하여 용강의 흐름이 일방향으로 회전되게 하므로써 용강의 공급이나 온도 등을 균일하게 하고, 용강이 한곳에서 집중되거나 정체되는 것을 방지하므로서 주조시 응고 균일화 및 주조 안정성을 가져오며, 또한 기존의 응고쉘 성장과 평행한 방향의 용강 공급에 비해 응고쉘 성장 방향과 직각 방향으로 용강을 공급하므로써 응고쉘 조직의 성장을 균일하게 하고, 과도하게 성장하는 응고쉘을 잘라 주어 등축정의 균일화도 도모할 수 있도록 함에 그 목적이 있다.The present invention was invented to solve the above problems in consideration of the above problems, so that the flow of the molten steel is rotated in one direction by having a predetermined angle in the direction of the discharge port of the nozzle to uniformly supply the molten steel or the temperature, It prevents concentration or stagnation of molten steel in one place, resulting in uniform solidification and casting stability during casting, and also by supplying molten steel in a direction perpendicular to the solidification shell growth direction as compared to the molten steel in a direction parallel to the conventional solidification shell growth. The purpose of the present invention is to uniformize the growth of the shell structure and to cut out the excessively growing solidified shell so that uniformity of equiaxed crystals can be achieved.

도 1은 일반적인 박판주조장치의 개략도1 is a schematic diagram of a general sheet casting apparatus

도 2a,b는 종래 노즐의 토출구 형상을 나타낸 사시도Figure 2a, b is a perspective view showing the discharge port shape of the conventional nozzle

도 3a,b는 종래 노즐의 토출구에서 용강이 토출되는 상태를 보인 평면도3A and 3B are plan views showing a state in which molten steel is discharged from a discharge port of a conventional nozzle;

도 4는 종래 용강공급 및 응고쉘 성장을 나타낸 예시도Figure 4 is an illustration showing the conventional molten steel supply and solidification shell growth

도 5a,b는 본 발명의 용강 균일 공급 노즐 사시도 및 평단면도Figure 5a, b is a perspective view and a plan cross-sectional view of the molten steel uniform supply nozzle of the present invention

도 6은 본 발명의 용강 공급 및 응고쉘 성장을 나타낸 예시도Figure 6 is an illustration showing the molten steel supply and solidification shell growth of the present invention

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 노즐 2 : 롤(쌍롤)1 Nozzle 2 Roll (Twin Roll)

3 : 박판(주편) 4 : 용탕3: thin plate (casting) 4: molten metal

5 : 원통형노즐 6 : 원통형 노즐의 토출구5: cylindrical nozzle 6: discharge port of cylindrical nozzle

7 : 사각 노즐 8 : 사각노즐 토출구7: square nozzle 8: square nozzle discharge port

9 : 단변 토출구 10 : 용강높이9: Short side discharge port 10: Molten steel height

11 : 응고쉘(주상정)11: solidified shell

● H : 용강 토출구 높이● H: molten steel discharge port height

● SH : 토출구 상단의 침지 깊이● SH: Immersion depth at the top of the discharge port

● W : 용강 토출구 폭● W: Molten steel discharge port width

● S : 용강 토출구 간격● S: Molten steel discharge port spacing

● α : 용강 토출구의 수평 방향 각도● α: Horizontal angle of molten steel discharge port

이와 같은 목적을 갖는 본 발명은 첨부도면 도 5a 및 도 5b에 도시된 바와 같이 전체적으로 직육면체의 형상을 가지고, 측벽에는 다수개의 토출구가 형성되어 있는 연속주조장치용 사각노즐(7)에 있어서,The present invention having the above object has a rectangular parallelepiped shape as shown in FIGS. 5A and 5B and a rectangular nozzle 7 for a continuous casting apparatus having a plurality of discharge holes formed on the side wall thereof.

외형의 높이는 적어도 토출구의 침지깊이 이상이고, 각 측벽의 너비는 적어도 토출구 하나의 폭 이상이 되도록 형성하고,The height of the outer shape is at least the immersion depth of the discharge port, the width of each side wall is formed to be at least the width of one discharge port,

상기 각 토출구는 수평방향각도(α)가 20도 이상, 폭(W)이 3 내지 100mm, 높이(H)가 5 내지 100mm로 형성하되,Each discharge port has a horizontal angle α of 20 degrees or more, a width W of 3 to 100 mm, and a height H of 5 to 100 mm.

상기 각 토출구의 간격(S)은 10mm 이상, 침지깊이(SH)는 10 내지 100mm가 되도록 형성함을 특징으로 하는 연속주조장치에서의 용강 균일공급 노즐이며,The spacing S of each discharge port is at least 10mm, the immersion depth (SH) is formed to be 10 to 100mm, molten steel uniform supply nozzle in the continuous casting device,

용강의 주입시 용강의 흐름을 일방향으로 회전하여 흐르게 하므로써 용강의 균일 주입, 정체 구역 제거 및 응고쉘의 균일 성장을 촉진시켜 주편의 품질을 향상시키도록 한 것이다.When the molten steel is injected, the flow of molten steel is rotated in one direction to promote uniform injection of molten steel, removal of stagnant zones, and uniform growth of the solidified shell, thereby improving the quality of the cast steel.

먼저 본 발명은 용강이 일방향으로 회전할 수 있도록 하기 위해 단변 및 장변의 토출구 각도(α)를 수평 방향으로 20°이상이 되게 하였다.First, in order to allow molten steel to rotate in one direction, the outlet angles α of the short sides and the long sides are 20 ° or more in the horizontal direction.

일방의 롤(2) 측의 토출구의 각도 방향과 반대측의 토출구의 각도 방향은 반대로 하고, 단변의 토출구(9)도 양측의 토출 방향을 반대로 함에 따라 용강의 흐름을 일방향이 되게 하였다.The angular direction of the discharge port on the opposite side to the angular direction of the discharge port on the one roll 2 side was reversed, and the flow direction of the molten steel was made to be one direction as the discharge port 9 on the short side reversed the discharge direction on both sides.

용강의 흐름 방향은 시계 방향이나 반시계 방향이나 동일한 효과가 있다. 토출구의 폭(W)이 너무 길게 되면, 각도(α)를 가지는 토출구 주위에서는 용강의 흐름이 각도(α)를 가지고 흐르게 되나 중심부에서는 벽의 각도 성분이 작아져 수직 방향으로 토출되므로, 가능한 토출구의 폭(W)을 작게 하여야 한다.The flow direction of the molten steel has the same effect as clockwise or counterclockwise. If the width W of the discharge port is too long, the flow of molten steel flows with the angle α around the discharge port having the angle α, but at the center, the angle component of the wall becomes smaller and is discharged in the vertical direction. The width W should be made small.

최소의 폭은 용강의 공급이 가능한 3mm이상으로 하고, 최대 폭은 노즐 벽의 두께에 따라 달라지나 100mm정도는, 토출구 각도를 제어하면 용강의 토출 각도를 제어할 수 있다.The minimum width is 3 mm or more for supplying molten steel, and the maximum width varies depending on the thickness of the nozzle wall. However, about 100 mm, the ejection angle of the molten steel can be controlled by controlling the ejection opening angle.

종래의 방법과는 달리 토출구의 개수가 많아지게 되는데, 토출구의 높이(H)를 종래와 유사하게 하면, 용강 공급량이 모자라게 되므로 토출구의 높이(H)를 가능한 크게 하여 용강 공급량을 크게 할 필요가 있다.Unlike the conventional method, the number of ejection openings is increased. If the height H of the ejection openings is similar to the conventional method, since the molten steel supply amount is insufficient, it is necessary to increase the molten steel supply amount by making the ejection opening height H as large as possible. .

토출구의 높이는 최소 5mm에서 최대 100mm로 제어 가능하며, 토출구의 높이와 폭은 반비례하게 적용하여 유사한 용강 공급량이 되게 제어하여야 한다.The height of the discharge port can be controlled from the minimum 5mm to the maximum 100mm, and the height and width of the discharge port should be controlled in inverse proportion to the supply of similar molten steel.

토출구의 간격(S)은 용강 공급량과 파손 여부를 고려하여, 적어도 10mm이상이 되게 한다. 또한 용강의 회전을 용이하게 하기 위해서는 토출구의 침지 깊이(SH)가 중요한데, 용강 높이(10)로부터 침지깊이(SH)가 가능한 한 낮게 제어하는 것이 탕면 표면류의 흐름을 제어하는데 용이하며, 침지 깊이(SH)가 너무 얕으면, 탕면 유동이 심하게 되므로, 토출구의 침지 깊이(SH)는 10∼100mm로 제어하고, 토출구의 높이(H)와 폭(W)의 값이 작을수록 토출류의 속도가 증가하므로 토출구의 깊이(SH)를 깊게 유지하여야 한다.The spacing S of the discharge port is at least 10 mm in consideration of the molten steel supply amount and damage. In addition, in order to facilitate the rotation of the molten steel, the immersion depth (SH) of the discharge port is important, controlling the immersion depth (SH) as low as possible from the molten steel height (10), it is easy to control the flow of the surface surface flow, immersion depth If the SH is too shallow, the surface flow becomes severe, so the immersion depth SH of the discharge port is controlled to 10 to 100 mm, and the smaller the value of the height H and the width W of the discharge port is, the faster the discharge flow rate is. As it increases, the depth SH of the discharge port must be kept deep.

이상과 같이 토출구의 형상을 제어하면, 용강의 흐름이 일방향으로 회전하게 되는데, 이때에는 용강의 정체 구역이 없어져 불순물의 집중이나 온도 불균일 등이 억제되어 용강의 균일 주입이 가능하게 된다.By controlling the shape of the discharge port as described above, the flow of the molten steel is rotated in one direction. At this time, the stagnant zone of the molten steel is eliminated, and the concentration of impurities, temperature nonuniformity, etc. are suppressed, and uniform molten steel can be injected.

또한 용강주입 방향이 롤이나 주형에 수직으로 주입되지 않고, 롤이나 주형과 평행하게 공급되어 흐르므로 응고쉘의 성장시 응고쉘(11)의 성장 방향과 용강의 흐름 방향이 직각을 이루므로 응고쉘 성장을 균일하게 제어가능하다. 이는 도 6에 나타내었다.In addition, since the molten steel injection direction is not injected perpendicular to the roll or the mold and is supplied in parallel with the roll or the mold, the solidification shell 11 has a perpendicular direction to the growth direction of the solidification shell 11 and the flow direction of the molten steel when the solidification shell is grown. Growth can be controlled uniformly. This is shown in FIG. 6.

본 발명에서는, 용강 공급이 균일하게 되도록 토출구의 수평 방향 각도를 20°이상으로 하고, 용강 흐름이 전체적으로 일정 각도를 가지고 주입될 수 있도록 토출구의 폭(W)을 3∼100mm로 하고, 높이(H)를 5∼100mm로 하며, 토출구의 간격(S)은 10mm 이상으로 하여 파손되지 않게 한다.In the present invention, the horizontal angle of the discharge port is set to 20 ° or more so that the molten steel supply is uniform, and the width W of the discharge port is 3 to 100 mm so that the molten steel flow can be injected at a predetermined angle as a whole, and the height H ) Is set to 5 to 100 mm, and the gap S of the discharge port is set to 10 mm or more so as not to be damaged.

또한 토출구의 침지 깊이(SH)를 10∼100mm로 제어하여 용탕(4) 유동을 억제하고, 용강의 표면 흐름 방향이 극대화 될 수 있게 하였다.In addition, by controlling the immersion depth (SH) of the discharge port to 10 ~ 100mm to suppress the flow of the molten metal (4), the surface flow direction of the molten steel can be maximized.

이상과 같은 용강 공급 노즐(7)로 용강을 일정한 방향으로 회전하게 하여 용강의 정체 구역을 없애고, 응고쉘의 성장을 균일하게 하며, 용탕 표면의 불순물 집중 현상을 억제하므로써 주편의 품질을 향상시켰다.The molten steel is rotated in a constant direction by the molten steel supply nozzle 7 as described above, thereby eliminating the stagnation zone of the molten steel, making the growth of the solidified shell uniform, and suppressing the concentration of impurities on the surface of the molten metal, thereby improving the quality of the cast steel.

이상과 같은 본 발명은 노즐 토출구의 수평 방향 각도(α)를 비스듬히 하여 용강의 흐름이 한 방향으로 회전하게 함으로써 용강 공급을 균일하게 하고, 정체 구역이나 용강의 충돌이 없도록 함으로써 균일 응고를 유도하며, 용강의 온도 균일성을 향상시키고, 용탕 표면의 불순물을 최소화하며, 응고쉘의 성장을 균일화하는 장점이 있어 주편의 품질을 향상시킬 수 있는 효과가 있다.The present invention as described above, by inclining the horizontal angle (α) of the nozzle discharge port in such a way that the flow of molten steel rotates in one direction, thereby uniformly supplying molten steel, and inducing uniform solidification by preventing collision between the stagnant zone and molten steel, It has the advantage of improving the temperature uniformity of the molten steel, minimizing impurities on the surface of the molten metal, and homogenizing the growth of the solidified shell, thereby improving the quality of the cast steel.

Claims (1)

전체적으로 직육면체의 형상을 가지고, 측벽에는 다수개의 토출구가 형성되어 있는 연속주조장치용 사각노즐(7)에 있어서,In the rectangular nozzle (7) for continuous casting apparatus having the shape of a rectangular parallelepiped as a whole, and having a plurality of discharge ports formed on the side walls thereof, 외형의 높이는 적어도 토출구의 침지깊이 이상이고, 각 측벽의 너비는 적어도 토출구 하나의 폭 이상이 되도록 형성하고,The height of the outer shape is at least the immersion depth of the discharge port, the width of each side wall is formed to be at least the width of one discharge port, 상기 각 토출구는 수평방향각도(α)가 20도 이상, 폭(W)이 3 내지 100mm, 높이(H)가 5 내지 100mm로 형성하되,Each discharge port has a horizontal angle α of 20 degrees or more, a width W of 3 to 100 mm, and a height H of 5 to 100 mm. 상기 각 토출구의 간격(S)은 10mm 이상, 침지깊이(SH)는 10 내지 100mm가 되도록 형성함을 특징으로 하는 연속주조장치에서의 용강 균일공급 노즐.The spacing (S) of each discharge port is 10mm or more, the immersion depth (SH) is formed so that 10 to 100mm, molten steel uniform supply nozzle in the continuous casting device.
KR1019970074234A 1997-12-26 1997-12-26 Nozzle for uniformly supplying molten steel in continuous casting line KR100333077B1 (en)

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Publication number Priority date Publication date Assignee Title
KR20160068087A (en) 2014-12-04 2016-06-15 주식회사 포스코 Submerged entry nozzle for continuous casting
KR20160076739A (en) 2014-12-23 2016-07-01 주식회사 포스코 Nozzle

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* Cited by examiner, † Cited by third party
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KR101304620B1 (en) * 2010-12-28 2013-09-05 재단법인 포항산업과학연구원 Nozzle of continuous flow casting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160068087A (en) 2014-12-04 2016-06-15 주식회사 포스코 Submerged entry nozzle for continuous casting
KR20160076739A (en) 2014-12-23 2016-07-01 주식회사 포스코 Nozzle

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