Tundish dam structure with flow guide

Abstract

The application discloses a tundish dam structure with a flow guide pipe, which comprises a straight wall, a flow guide hole, a side wall, a dam and a flow guide pipe. The straight wall, the side wall and the dam are an integrated structure, and the integrated structure is embedded in the inner wall of the tundish at both ends. The straight wall in the inner cavity of the dam is provided with a plurality of flow guide holes, and the flow guide pipe is embedded on the flow guide hole. The application effectively promotes the removal of inclusions in the impact area and the casting area of the tundish.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metallurgical continuous casting, in particular to a tundish dam structure with a flow guide pipe. BACKGROUND

[0002] With the rapid development of continuous casting technology and the increasing demand for high-quality, high-purity steel, the trajectory of inclusions in the tundish during continuous casting has become a key concern for metallurgists. In the 1970s, the core of the tundish metallurgy that emerged in various countries was how to maximize the removal of inclusions. In order to obtain high-purity continuous casting steel, many researchers have devoted themselves to improving the flow control form of the tundish, installing flow stabilizers, dams, and other flow control devices to improve the flow characteristics of the tundish, promote the floating of inclusions, and improve the purity of the steel.

[0003] Scholars have developed V-shaped double dams based on the commonly used U-shaped dams, which have better solved the problems of uneven steel temperature in the tundish, short nozzle corresponding time, and large dead volume. However, with the development of social economy, the requirements for inclusions of continuous casting billets are becoming higher and higher. The original V-shaped dam structure can only increase the residence time of the steel to promote the floating of part of the inclusions, while the remaining inclusions pass through the dam into the pouring area. The pouring area lacks the function of secondary removal of inclusions, so that the remaining inclusions enter the continuous casting crystallizer with the steel, which is not conducive to the production of high-purity steel, and there is still room for improvement in the removal of inclusions.

[0004] Therefore, it is necessary to develop a new tundish dam structure with a flow guide pipe to promote the removal of inclusions in the tundish impact area and the pouring area. SUMMARY

[0005] The present application provides a tundish dam structure with a flow guide pipe to effectively promote the removal of inclusions in the tundish impact area and the pouring area.

[0006] Technical scheme: The tundish dam structure with a flow guide pipe of the present application is characterized by comprising a straight wall, a flow guide hole, a side wall, a dam, and a flow guide pipe. The straight wall, the side wall, and the dam are an integral structure, which is embedded at both ends of the inner wall of the tundish. The straight wall in the inner cavity of the dam is provided with a plurality of flow guide holes, and the flow guide pipe is embedded on the flow guide hole.

[0007] Among them, the tundish dam is a P-shaped structure, the molten steel bypasses the side wall and the dam from the impact area, enters the inner cavity of the dam, weakens the turbulent effect of the steel liquid, and part of the inclusions is removed by floating in this area. Part of the inclusions that do not float in time flow with the steel liquid, pass through the flow guide pipe of the straight wall into the pouring area, avoid the formation of horizontal laminar flow, and the inclusions gather and float, sink at the edge of the tundish to form a circulating flow, and achieve the effect of purifying the steel liquid.

[0008] The included angle between the straight wall and the side wall is 30-60 degrees.

[0009] The corner angle of the side wall is 120-150 degrees, and the straight wall and the side wall are connected by a dam at the lower part.

[0010] The height of the dam is 80-120 mm, and the molten steel enters the inner cavity of the dam after crossing the dam.

[0011] The guide pipe is a long cylinder with a length of 200-300 mm and a circular hole diameter of 80-100 mm.

[0012] The number of the guide holes is 2-3, and the distance between the guide holes is 120-160 mm.

[0013] The distance between the center of the guide hole and the bottom of the straight wall is 300-400 mm, the included angle between the guide pipe and the horizontal line is 5-10 degrees, and the length is 200-300 mm.

[0014] During the process of the molten steel flowing out of the guide pipe, due to the angle with the horizontal position, the flow rate decreases with the increase of the potential energy of the molten steel, so that the residence time of the molten steel in the impact area to the pouring area is increased, and the inclusion floating is promoted.

[0015] The angle design of the guide pipe makes the molten steel enter the pouring area to avoid the stopper and the inner wall of the tundish, the molten steel forms a horizontal laminar flow, and a circulating flow is formed in the height direction, so that the inclusions are gathered and floated.

[0016] Compared with the prior art, the present application has the following advantages: the present application is designed by a "P" type tundish dam, which not only slows down the turbulent state of the molten steel in the impact area, but also increases the guide pipe design on the guide hole, so that the molten steel forms a horizontal laminar flow in the pouring area after passing through the dam, avoids the stopper and the tundish wall, avoids the erosion of the refractory, and promotes the inclusion floating. The design and application of the dam will effectively improve the inclusion removal effect of the molten steel and help the production of clean steel. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present application;

[0018] Figure 2 It is a structural schematic diagram of the guide pipe of the present application;

[0019] In the figure, 1 is a straight wall; 2 is a guide hole; 3 is a side wall; 4 is a dam; 5 is an impact area; 6 is a pouring area; 7 is a tundish inner wall; 8 is a stopper; 9 is a guide pipe; 10 is a dam inner cavity. DETAILED DESCRIPTION

[0020] The technical solutions of the present application are further described below in combination with the drawings and specific embodiments.

[0021] The tundish retaining wall structure with a flow guide pipe comprises a straight wall 1, flow guide holes 2, side walls 3, a retaining dam 4 and a flow guide pipe 9. The straight wall 1, the side walls 3 and the retaining dam 4 are an integral structure, which is embedded at both ends in the inner wall 7 of the tundish. The straight wall 1 in the inner cavity 10 of the retaining wall is provided with a plurality of flow guide holes 2, and the flow guide pipe 9 is embedded on the flow guide holes 2. The flow guide pipe 9 is installed in the flow guide holes 2 after the outer surface of one end is coated with fire clay.

[0022] The tundish retaining wall is of P-shaped structure. The molten steel bypasses the side walls 3 and the retaining dam 4 from the impact area 5, enters the inner cavity 10 of the retaining wall, and weakens the turbulent effect of the molten steel. Most of the inclusions are removed by floating in this area. Part of the inclusions that do not float in time flow with the molten steel, pass through the flow guide pipe 9 of the straight wall 1, enter the pouring area 6, avoid the stopper 8 to form horizontal laminar flow, and then a large part of the inclusions will gather and float up. Finally, the circulating flow is formed by sinking at the edge of the tundish, so as to purify the molten steel.

[0023] The included angle between the straight wall 1 and the side wall 3 is 30°-60°.

[0024] The corner angle of the side wall 3 is 120°-150°, and the lower part connects the straight wall 1 and the side wall 3 by the retaining dam 4.

[0025] The height of the retaining dam 4 is 80mm-120mm, and the molten steel enters the inner cavity 10 of the retaining wall after crossing the retaining dam 4.

[0026] The flow guide pipe 9 is a long cylinder with a length of 200mm-300mm and a circular hole diameter of 80mm-100mm.

[0027] The number of the flow guide holes 2 is 2-3, and the distance between the flow guide holes 2 is 120mm-160mm.

[0028] The distance between the center of the flow guide hole 2 and the bottom of the straight wall 1 is 300mm-400mm, the included angle between the flow guide pipe 9 and the horizontal line is 5°-10°, and the length is 200mm-300mm. During the process of the molten steel flowing out of the flow guide pipe 9, the residence time of the molten steel in the impact area 5 to the pouring area 6 is increased due to the angle with the horizontal position and the decrease of the flow rate with the increase of the potential energy of the molten steel, so as to promote the floating of the inclusions. The angle design of the flow guide pipe 9 makes the molten steel avoid the stopper 8 and the inner wall 7 of the tundish after entering the pouring area 6, so that the molten steel forms horizontal laminar flow and forms circulating flow in the height direction, so as to promote the gathering and floating of the fine inclusions.

[0029] The present application has the following advantages: 1. The "P" type baffle wall design slows down the fluctuation trend of the turbulent flow field in the impact area, and promotes the inclusion to float up; 2. The upward inclined flow guide pipe design effectively improves the kinetic energy of the molten steel crossing the baffle wall, forms laminar circulation, and promotes the secondary aggregation and floating removal of the inclusion which does not have enough time to float up in the impact area; 3. The flow guide pipe design makes the molten steel entering the pouring area not directly scouring the wall of the tundish, reduces the erosion of the refractory, and improves the purity of the molten steel; 4. The flow guide pipe design makes the molten steel flow avoid the stopper, prevents the disturbance and short flow to the stopper.

Claims

1. A shroud structure for a tundish with a flow guide, characterized by: The utility model relates to a tundish with flow guide, including straight wall (1), flow guide hole (2), side wall (3), dam (4) and flow guide pipe (9), straight wall (1), side wall (3) and dam (4) are integrated structure, and the integrated structure both ends are inlaid in the tundish inner wall (7), and the straight wall (1) in the tundish dam inner cavity (10) is equipped with a plurality of flow guide holes (2), and the flow guide hole (2) is inlaid with flow guide pipe (9), the tundish dam is P type structure, and the molten steel passes side wall (3) and dam (4) from impact area (5), enters tundish dam inner cavity (10), weakens the turbulent effect of molten steel, and part of inclusion completes floating removal in this area, and part of inclusion that does not float in time flows along with molten steel, passes through the flow guide pipe (9) of straight wall (1) and enters pouring area (6), avoids stopper (8) and forms horizontal laminar flow, and inclusion gathers and floats, and the circulation flow is formed in the tundish edge part, reaches the effect of purifying molten steel, the flow guide hole (2) center and straight wall (1) bottom distance is 300mm-400mm, the flow guide pipe (9) and horizontal line angle degree is 5 DEG-10 DEG, and length is 200mm-300mm.

2. The shroud structure of a tundish with a flow guide according to claim 1, characterized by: The angle between the straight wall (1) and the side wall (3) is 30°-60°.

3. The shroud structure of a tundish with a nozzle according to claim 1, wherein: The corner angle of the side wall (3) is 120°-150°, and the lower part connects the straight wall (1) and the side wall (3) by the dam (4).

4. The shroud structure of a tundish with a nozzle according to claim 1, wherein: The height of the dam (4) is 80mm-120mm, and the molten steel enters the tundish dam inner cavity (10) after crossing the dam (4).

5. The shroud structure of a tundish with a nozzle according to claim 1, wherein: The flow guide pipe (9) is a long tube type, with a length of 200mm-300mm and a circular hole diameter of 80mm-100mm.

6. The shroud structure of a tundish with a nozzle according to claim 5, wherein: The number of flow guide holes (2) is 2-3, and the distance between the flow guide holes (2) is 120mm-160mm.

7. The shroud structure of a tundish with a nozzle according to claim 1, wherein: During the molten steel flowing out of the flow guide pipe (9), the angle with the horizontal position is increased with the potential energy of the molten steel, and the flow rate is reduced, so that the residence time of the molten steel in the impact area (5) to the pouring area (6) is increased, and the inclusion floating is promoted.

8. The shroud structure of a tundish with a nozzle according to claim 7, wherein: The angle design of the flow guide pipe (9) makes the molten steel enter the pouring area (6) to avoid the stopper (8) and the tundish inner wall (7), and the molten steel forms a horizontal laminar flow and a circulation flow in the height direction, promoting the inclusion gathering and floating.

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