Continuous casting tundish dam and installation method

Abstract

The present application relates to a kind of continuous casting tundish retaining wall and installation method, belong to steelmaking continuous casting technical field.Retaining wall is arranged between stabilizer, glue hole, each side retaining wall is sequentially provided with three in Z shape, one end of each retaining wall is fixed, and one end is free, and the passage for molten steel to pass through is formed between the inner wall of free end tundish.Three retaining walls are parallel in the first, third direction, and the first, third direction is opposite.The installation method includes: S1, two first retaining walls are installed according to the shape of splayed on the two sides of stabilizer;S2, second retaining wall is reversely installed on the outside of two first retaining walls;S3, third retaining wall is reversely installed on the outside of two second retaining walls.The present application delays the flow speed of molten steel by setting three Z-shaped retaining walls, extends the flow distance of molten steel, gives the time for slag inclusion in molten steel to float up fully, to reduce the inclusion content in molten steel and improve the quality of casting blank.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking continuous casting technology, and relates to a continuous casting tundish retaining wall and its installation method. Background Technology

[0002] In continuous casting production, ensuring the purity of molten steel is key to improving the quality of the final cast billet. Reducing the amount of inclusions entering the billet is one of the important means to improve product quality, and tundish retaining wall technology plays a crucial role in this process.

[0003] Tundish retaining wall technology is mainly divided into two forms: single retaining wall and double retaining wall (high and low). The single retaining wall is a simple and effective design, typically 800 mm high, with 100 mm diameter steel passage holes on both sides of the bottom. The wall thickness is controlled between 80 and 100 mm. This type of retaining wall is made of high-temperature resistant material, maintaining stability in high-temperature environments and effectively isolating external impurities from contaminating the molten steel. The steel passage holes allow molten steel to flow smoothly into the tundish, while also helping inclusions in the molten steel to float and be removed, thus achieving a purification effect on the molten steel.

[0004] However, with continuous technological advancements and increasing production demands, the limitations of single-wall technology have gradually become apparent. To further improve steel quality, the high-low double-wall technology emerged. This technology innovates upon the single-wall approach, consisting of an 800mm high wall without through-holes and a 100mm opening at the bottom, and a 300mm high wall without through-holes, installed 300mm apart. This design not only retains the purifying effect of the single-wall system on molten steel but also significantly improves the reduction of inclusions entering the billet. More importantly, the double-wall technology achieves a breakthrough in promoting inclusion flotation. By altering the steel flow field and temperature field, more inclusions can float to the surface and be removed.

[0005] However, the high and low double-wall technology also brings new challenges. Since neither the high nor low wall has through-holes, molten steel must overflow from the 300mm high low wall after the ladle begins pouring to flow into the tundish nozzle for further pouring. This design significantly extends the tundish pouring time to 100-120 seconds, increasing the difficulty of tundish replacement. Furthermore, the low wall is prone to loosening and floating under the static pressure of the molten steel, affecting not only its stability but also potentially threatening the safe operation of critical equipment such as the stopper rod. Towards the end of the tundish pouring process, molten steel cannot flow out between the two low walls, creating casting residue, further increasing production costs and cleaning difficulties.

[0006] To address the aforementioned technical issues, there is an urgent need to improve the tundish casting process and workflow control to reduce tundish start-up time and replacement difficulty; and to explore new steel purification technologies and methods to further reduce inclusion content and improve billet quality. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a continuous casting tundish retaining wall and its installation method, which slows down the flow rate of molten steel, allows time for inclusions to float, reduces the content of inclusions, and improves the quality of the cast billet.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A continuous casting tundish baffle wall is disposed between a flow stabilizer and a glue injection hole. The flow stabilizer is disposed inside the continuous casting tundish, and the glue injection hole is opened on both sides of the flow stabilizer. Several baffle walls are arranged in a Z-shape. Each baffle wall has one fixed end and one free end. The fixed end is connected to the inner wall of the continuous casting tundish, and the free end forms a channel between itself and the inner wall of the continuous casting tundish on the other side to facilitate the passage of molten steel.

[0010] Optionally, the retaining wall includes at least a first retaining wall, a second retaining wall, and a third retaining wall arranged sequentially. The first and second retaining walls have opposite orientations and are arranged in a figure-eight shape. The first and third retaining walls have parallel orientations. The fixed ends of the first and second retaining walls are located on different sides, while the fixed ends of the first and third retaining walls are located on the same side.

[0011] Optionally, the distance between the first retaining wall and the flow stabilizer is greater than or equal to 1.2m.

[0012] Optionally, the free ends of adjacent retaining walls are spaced 200mm apart.

[0013] Optionally, the second retaining wall is oriented toward the first retaining wall, and the third retaining wall is oriented toward the second retaining wall.

[0014] Optionally, the channel width is equal to 1 / 4 of the internal width of the continuous casting tundish.

[0015] A method for installing a retaining wall for a continuous casting tundish includes the following steps:

[0016] S1, at a distance of 1.2 meters on both sides of the flow stabilizer of the continuous casting tundish, two first baffles are installed in a figure-eight shape. One end of the first baffle is connected to the inner wall of the continuous casting tundish, and the other end is free. The free end and the inner wall on the other side form a first channel to facilitate the passage of molten steel.

[0017] S2, a second retaining wall is installed on the inner wall on the other side of the fixed end of the first retaining wall, the second retaining wall having the opposite orientation to the first retaining wall; a second channel is formed between the free end of the second retaining wall and the inner wall of the continuous casting tundish;

[0018] S3, Install a third retaining wall, which is installed parallel to the first retaining wall and on the same inner wall as the first retaining wall; similar to the first and second retaining walls, the free end of the third retaining wall forms a third channel with the inner wall of the continuous casting tundish.

[0019] Optionally, the spacing between the first channel, the second channel, and the third channel is equal to 1 / 4 of the internal width of the continuous casting tundish.

[0020] Optionally, the second retaining wall is oriented towards the first retaining wall, and the third retaining wall is oriented towards the second retaining wall; the free ends of the first and second retaining walls, and the free ends of the second and third retaining walls are spaced 200mm apart.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention utilizes three Z-shaped baffles to divert molten steel through three stages, preventing inclusions from rising. The inclusions float to the surface under the influence of the first baffle, while a small portion flows back into the second baffle, extending the rising time and allowing them to fully float. The final baffle, acting as a reflux zone, further slows the flow, causing the inclusions to rise to the surface of the molten steel or detach from the casting siphon area. This extends the flow path of the molten steel, providing sufficient time for inclusions to rise and reducing residual molten steel at the end of the ladle pour.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram illustrating the arrangement of the retaining wall in the continuous casting tundish of the present invention.

[0026] Figure label:

[0027] 1. Continuous casting tundish, 2. Flow stabilizer, 3. Gel injection hole, 4. First retaining wall, 5. Second retaining wall, 6. Third retaining wall. Detailed Implementation

[0028] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Please see Figure 1 This is a type of baffle wall for continuous casting tundish, set between a flow stabilizer 2 and a glue injection hole 3. The flow stabilizer 2 is located inside the continuous casting tundish 1, and the glue injection hole 3 is located on both sides of the flow stabilizer 2. Several baffle walls are arranged in a Z-shape, with one end of each baffle wall fixed and the other end free. The fixed end is connected to the inner wall of the continuous casting tundish 1, and the free end forms a channel between itself and the inner wall of the tundish on the other side to facilitate the passage of molten steel. The width of the channel is preferably 1 / 4 of the internal width of the continuous casting tundish 1.

[0032] The retaining wall comprises at least a first retaining wall 4, a second retaining wall 5, and a third retaining wall 6 arranged sequentially. The first retaining wall 4 and the second retaining wall 5 have opposite orientations, forming a V-shape; the first retaining wall 4 and the third retaining wall 6 have parallel orientations; the fixed ends of the first retaining wall 4 and the second retaining wall 5 are located on different sides, while the fixed ends of the first retaining wall 4 and the third retaining wall 6 are located on the same side. The second retaining wall 5 faces the first retaining wall 4, and the third retaining wall 6 faces the second retaining wall 5. The free ends of adjacent retaining walls are spaced 200mm apart.

[0033] The distance between the first retaining wall 4 and the flow stabilizer 2 is greater than or equal to 1.2m.

[0034] A method for installing a retaining wall on a continuous casting tundish includes the following steps:

[0035] S1, at a distance of 1.2 meters on both sides of the flow stabilizer 2 of the continuous casting tundish 1, two first baffles 4 are installed in a figure-eight shape. One end of the first baffle 4 is connected to the inner wall of the continuous casting tundish 1, and the other end is free. The free end and the inner wall on the other side form a first channel to facilitate the passage of molten steel.

[0036] S2, a second baffle 5 is installed on the inner wall on the other side of the fixed end of the first baffle 4. The second baffle 5 is oriented in the opposite direction to the first baffle 4. A second channel is formed between the free end of the second baffle 5 and the inner wall of the continuous casting tundish 1.

[0037] S3, install the third retaining wall 6, which is installed parallel to the first retaining wall 4 and on the same inner wall as the first retaining wall 4; similar to the first retaining wall 4 and the second retaining wall 5, the free end of the third retaining wall 6 forms a third channel with the inner wall of the continuous casting tundish 1.

[0038] After the molten steel comes out of the stabilizer 2, it first flows to the first baffle 4, then flows along the side of the first baffle 4 through the first channel, and reaches the space between the first baffle 4 and the second baffle 5. Then it flows along the side of the second baffle 5 through the second channel, and reaches the space between the second baffle 5 and the third baffle 6. Finally, it flows along the side of the third baffle 6 through the third channel and flows to the pouring hole.

[0039] Molten steel passes through three Z-shaped baffles, which divert slag inclusions three times. The inclusions float to the surface under the influence of the first baffle (4), while a small portion flows back into the second baffle (5), extending the floating time and allowing them to rise fully. The final baffle, acting as a buffer zone, slows the flow until the inclusions reach the surface or have already left the casting siphon area. This process extends the flow path of the molten steel, providing sufficient time for inclusions to float and reducing residual molten steel at the end of the ladle pour.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A continuous casting tundish retaining wall, characterized in that: The flow stabilizer (2) is located between the flow stabilizer (2) and the glue injection hole (3). The flow stabilizer (2) is located inside the continuous casting tundish (1), and the glue injection hole (3) is located on both sides of the flow stabilizer (2). Several baffles are arranged in a Z-shape. Each baffle is fixed at one end and free at the other end. The fixed end is connected to the inner wall of the continuous casting tundish (1), and the free end forms a channel between the inner wall of the continuous casting tundish (1) on the other side to facilitate the passage of molten steel. The baffles include at least a first baffle (4), a second baffle (5), and a third baffle (6) arranged in sequence. The first baffle (4) and the second baffle (5) have opposite directions and are arranged in a figure-eight shape. The first baffle (4) and the third baffle (6) have parallel directions. The fixed ends of the first baffle (4) and the second baffle (5) are located on different sides, and the fixed ends of the first baffle (4) and the third baffle (6) are located on the same side.

2. The continuous casting tundish retaining wall according to claim 1, characterized in that: The distance between the first retaining wall (4) and the flow stabilizer (2) is greater than or equal to 1.2m.

3. The continuous casting tundish retaining wall according to claim 1, characterized in that: The free ends of adjacent retaining walls are spaced 200mm apart.

4. The continuous casting tundish retaining wall according to claim 1, characterized in that: The second retaining wall (5) is oriented toward the first retaining wall (4), and the third retaining wall (6) is oriented toward the second retaining wall (5).

5. The continuous casting tundish retaining wall according to claim 1, characterized in that: The width of the channel is equal to 1 / 4 of the internal width of the continuous casting tundish (1).

6. A method for installing a retaining wall for a continuous casting tundish, characterized in that: Includes the following steps: S1, at a distance of 1.2 meters on both sides of the flow stabilizer (2) of the continuous casting tundish (1), two first baffles (4) are installed in a figure-eight shape. One end of the first baffle (4) is connected to the inner wall of the continuous casting tundish (1), and the other end is free. The free end and the inner wall on the other side form a first channel to facilitate the passage of molten steel. S2, a second baffle (5) is installed on the inner wall on the other side of the fixed end of the first baffle (4), the second baffle (5) is opposite to the direction of the first baffle (4); a second channel is formed between the free end of the second baffle (5) and the inner wall of the continuous casting tundish (1); S3, install the third retaining wall (6), which is installed parallel to the first retaining wall (4) and on the same inner wall as the first retaining wall (4); similar to the first retaining wall (4) and the second retaining wall (5), the free end of the third retaining wall (6) forms a third channel between the inner wall of the continuous casting tundish (1).

7. The method for installing the continuous casting tundish retaining wall according to claim 6, characterized in that: The spacing between the first channel, the second channel, and the third channel is equal to 1 / 4 of the internal width of the continuous casting tundish (1).

8. The method for installing the continuous casting tundish retaining wall according to claim 6, characterized in that: The second retaining wall (5) is oriented toward the first retaining wall (4), and the third retaining wall (6) is oriented toward the second retaining wall (5); the free ends of the first retaining wall (4) and the second retaining wall (5) and the free ends of the second retaining wall (5) and the third retaining wall (6) are spaced 200mm apart.

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