Continuous casting tundish retaining wall and mounting method

Abstract

The invention relates to a continuous casting tundish retaining wall and an installation method, and belongs to the technical field of steelmaking continuous casting. The retaining walls are arranged between the current stabilizer and the glue injection hole, three retaining walls are sequentially arranged on each side in a Z shape, one end of each retaining wall is fixed, the other end of each retaining wall is free, and a channel facilitating passing of molten steel is formed between the free ends and the inner wall of the tundish. The directions of the first retaining wall and the third retaining wall are parallel, and the directions of the first retaining wall and the third retaining wall are opposite. The installation method comprises the steps that S1, the two first retaining walls are installed on the two sides of the current stabilizer in a splayed mode; s2, second retaining walls are reversely installed on the outer sides of the two first retaining walls; and S3, third retaining walls are reversely installed on the outer sides of the two second retaining walls. By arranging the three retaining walls arranged in the Z shape, the flowing speed of the molten steel is delayed, the flowing distance of the molten steel is prolonged, and the time for sufficient floating of slag inclusion in the molten steel is provided, so that the content of the slag inclusion in the molten steel is reduced, and the casting blank quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steelmaking continuous casting and relates to a continuous casting tundish retaining wall and an installation method thereof. Background Art

[0002] In the continuous casting process, ensuring the purity of molten steel is the key to improving the quality of the final ingot. Among them, reducing the entry of inclusions into the ingot is one of the important means to improve product quality, and the tundish retaining wall technology plays a vital role in this process.

[0003] The tundish retaining wall technology is mainly divided into two forms: single retaining wall and high and low double retaining wall. The single retaining wall is a simple and effective technology with a height of usually 800 mm. There are steel holes with a diameter of 100 mm on both sides of the bottom, and the wall thickness is controlled between 80 and 100 mm. This retaining wall is made of high-temperature resistant materials, which can remain stable in high-temperature environments and effectively isolate the contamination of molten steel by external impurities. The design of the steel holes allows the molten steel to flow smoothly into the tundish, and also helps the inclusions in the molten steel to float up and be removed, thereby achieving the purification effect of the molten steel.

[0004] However, with the continuous advancement of technology and the improvement of production requirements, the single retaining wall technology has gradually revealed its limitations. In order to further improve the quality of molten steel, the high and low double retaining wall technology came into being. This technology is an innovation based on the single retaining wall. It consists of a retaining wall with a height of 800 mm without through steel holes and a 100 mm bottom space, and a retaining wall with a height of 300 mm without through steel holes. The two are installed 300 mm apart. This design not only retains the purification effect of the single retaining wall on molten steel, but also has a significant improvement in reducing the slag inclusions in the molten steel entering the ingot. More importantly, the double retaining wall technology has made new breakthroughs in promoting the floating of slag inclusions. By changing the flow field and temperature field of the molten steel, more inclusions can float to the surface of the molten steel and be removed.

[0005] However, the high and low double retaining wall technology also brings new challenges. Since there are no through-holes in the high and low retaining walls, the molten steel needs to overflow from the 300 mm high low retaining wall after the ladle is poured before it can flow into the water inlet of the tundish for pouring. This design significantly extends the pouring time of the tundish to 100 to 120 seconds, increasing the difficulty of replacing the tundish. In addition, the low retaining wall is prone to loosening and floating under the static pressure of the molten steel, which not only affects the stability of the retaining wall, but may also pose a threat to the safe operation of key equipment such as the stopper rod. At the end of the tundish pouring, since the molten steel between the low retaining walls on both sides cannot flow out, casting residue will also be formed, further increasing the production cost and the difficulty of cleaning.

[0006] In view of the above technical problems, it is urgent to improve the tundish pouring process and process control to reduce the tundish pouring time and replacement difficulty; and explore new molten steel purification technologies and methods to further reduce the inclusion content and improve the quality of the ingot. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a continuous casting tundish retaining wall and an installation method to slow down the flow rate of molten steel, reserve time for slag inclusions to float, reduce the inclusion content, and improve the quality of the ingot.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A retaining wall for a continuous casting tundish is arranged between a flow stabilizer and a glue injection hole, the flow stabilizer is arranged in the continuous casting tundish, and the glue injection holes are opened on both sides of the flow stabilizer; the retaining walls are arranged in a Z shape in sequence, and each retaining wall has one end fixed and the other end free, the fixed end is connected to the inner wall of the continuous casting tundish, and a channel is formed between the free end 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 which are arranged in sequence, and the first retaining wall and the second retaining wall have opposite directions and are arranged in an eight-shape; the first retaining wall and the third retaining wall have parallel directions; the fixed ends of the first retaining wall and the second retaining wall are located on different sides, and the fixed ends of the first retaining wall and the third retaining wall 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 1.2 m.

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

[0013] Optionally, the second retaining wall runs toward the first retaining wall, and the third retaining wall runs 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 continuous casting tundish retaining wall comprises the following steps:

[0016] S1, two first retaining walls are installed in an eight-shaped pattern at a distance of 1.2 meters on both sides of the flow stabilizer of the continuous casting tundish, one end of the first retaining wall is connected to the inner wall of the continuous casting tundish, and the other end is free, and a first channel is formed between the free end and the inner wall on the other side to facilitate the passage of molten steel;

[0017] S2, installing a second retaining wall on the inner wall on the other side of the fixed end of the first retaining wall, wherein the second retaining wall is in the opposite direction 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 inner wall on the same side as the first retaining wall; similar to the first retaining wall and the second retaining wall, a third channel is formed between the free end of the third retaining wall and the inner wall of the continuous casting tundish.

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

[0020] Optionally, the second retaining wall runs toward the first retaining wall, and the third retaining wall runs toward the second retaining wall; the free ends of the first retaining wall and the second retaining wall, and the free ends of the second retaining wall and the third retaining wall are spaced 200 mm apart.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides three retaining walls arranged in a Z shape. The molten steel is divided three times to divert the slag inclusions in the molten steel. The slag inclusions float up under the blocking of the first retaining wall, and a small part of the slag inclusions enter the second retaining wall to form a reflux, which prolongs the floating time so that the slag inclusions can fully float up. Under the delaying effect of the reflux zone formed by the last retaining wall, the slag inclusions float to the surface of the molten steel or have been separated from the pouring siphon area. The flow channel of the molten steel is extended, giving the slag inclusions in the molten steel enough floating time, and reducing the excess of the molten steel at the tail of the tundish.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

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

[0026] Reference numerals:

[0027] 1 continuous casting tundish, 2 flow stabilizer, 3 glue injection hole, 4 first retaining wall, 5 second retaining wall, 6 third retaining wall. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] See also Figure 1 It is a continuous casting tundish retaining wall, which is arranged between the flow stabilizer 2 and the glue injection hole 3. The flow stabilizer 2 is arranged in the continuous casting tundish 1, and the glue injection holes 3 are opened on both sides of the flow stabilizer 2; there are several retaining walls arranged in a Z shape in sequence, each retaining wall has one end fixed and the other end free, the fixed end is connected to the inner wall of the continuous casting tundish 1, and a channel is formed between the free end and the inner wall of the tundish on the other side for molten steel to pass through; the channel width is preferably 1 / 4 of the internal width of the continuous casting tundish 1.

[0032] The retaining wall includes at least a first retaining wall 4, a second retaining wall 5 and a third retaining wall 6 which are arranged in sequence. The first retaining wall 4 and the second retaining wall 5 have opposite directions and are arranged in an eight-shaped shape. The first retaining wall 4 and the third retaining wall 6 have parallel directions. The fixed ends of the first retaining wall 4 and the second retaining wall 5 are located on different sides, and 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 is directed toward the first retaining wall 4, and the third retaining wall 6 is directed toward the second retaining wall 5. The free ends of adjacent retaining walls are spaced 200 mm apart.

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

[0034] A method for installing a retaining wall of a continuous casting tundish 1 comprises the following steps:

[0035] S1, two first retaining walls 4 are installed in an eight-shaped pattern at a distance of 1.2 meters on both sides of the flow stabilizer 2 of the continuous casting tundish 1, one end of the first retaining wall 4 is connected to the inner wall of the continuous casting tundish 1, and the other end is free, and a first channel is formed between the free end and the inner wall on the other side to facilitate the passage of molten steel;

[0036] S2, a second retaining wall 5 is installed on the inner wall on the other side of the fixed end of the first retaining wall 4, and the direction of the second retaining wall 5 is opposite to that of the first retaining wall 4; a second channel is formed between the free end of the second retaining wall 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 inner wall on the same side as the first retaining wall 4; similar to the first retaining wall 4 and the second retaining wall 5, a third channel is formed between the free end of the third retaining wall 6 and the inner wall of the continuous casting tundish 1.

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

[0039] The molten steel passes through three Z-shaped retaining walls, and after three diversions, the slag inclusions in the molten steel float up under the blocking of the first retaining wall 4, and a small part of the slag inclusions enter the second retaining wall 5 to form a reflux, which prolongs the floating time so that the slag inclusions can fully float up. Under the delaying effect of the reflux area formed by the last retaining wall, the slag inclusions float to the surface of the molten steel or have already left the pouring siphon area. The flow channel of the molten steel is extended, giving the slag inclusions in the molten steel enough time to float up, and reducing the excess of the molten steel at the tail of the tundish.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A continuous casting tundish retaining wall, characterized in that: It is arranged between a flow stabilizer (2) and a glue injection hole (3), wherein the flow stabilizer (2) is arranged in the continuous casting tundish (1), and the glue injection hole (3) is opened on both sides of the flow stabilizer (2); a plurality of retaining walls are arranged in a Z shape in sequence, and each retaining wall has one end fixed and the other end free, the fixed end is connected to the inner wall of the continuous casting tundish (1), and a channel is formed between the free end and the inner wall of the continuous casting tundish (1) on the other side to facilitate the passage of molten steel.

2. The continuous casting tundish retaining wall according to claim 1, characterized in that: The retaining wall comprises at least a first retaining wall (4), a second retaining wall (5) and a third retaining wall (6) which are arranged in sequence; the first retaining wall (4) and the second retaining wall (5) have opposite directions and are arranged in an eight-shaped shape; the first retaining wall (4) and the third retaining wall (6) have parallel directions; the fixed ends of the first retaining wall (4) and the second retaining wall (5) are located on different sides, and the fixed ends of the first retaining wall (4) and the third retaining wall (6) are located on the same side.

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

4. The continuous casting tundish retaining wall according to claim 2, characterized in that: The free ends of adjacent retaining walls are spaced 200 mm apart.

5. The continuous casting tundish retaining wall according to claim 2, characterized in that: The second retaining wall (5) extends toward the first retaining wall (4), and the third retaining wall (6) extends toward the second retaining wall (5).

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

7. A method for installing a continuous casting tundish retaining wall, characterized in that: The following steps are involved: S1, two first retaining walls (4) are installed in an eight-shaped pattern at a distance of 1.2 meters on both sides of the flow stabilizer (2) of the continuous casting tundish (1), one end of the first retaining wall (4) is connected to the inner wall of the continuous casting tundish (1), and the other end is free, and a first channel is formed between the free end and the inner wall on the other side for molten steel to pass through; S2, installing a second retaining wall (5) on the inner wall on the other side of the fixed end of the first retaining wall (4), wherein the second retaining wall (5) and the first retaining wall (4) are in opposite directions; and a second channel is formed between the free end of the second retaining wall (5) and the inner wall of the continuous casting tundish (1); S3, installing a third retaining wall (6), which is installed in parallel with the first retaining wall (4) and is installed on the same inner wall as the first retaining wall (4); similar to the first retaining wall (4) and the second retaining wall (5), a third channel is formed between the free end of the third retaining wall (6) and the inner wall of the continuous casting tundish (1).

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

9. The method for installing the retaining wall of the continuous casting tundish according to claim 7, 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 both spaced 200 mm apart.

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