Anti-erosion and anti-floating stabilizer for continuous casting tundish

Abstract

This utility model discloses an anti-erosion and anti-floating stabilizer for continuous casting tundishes, relating to the field of tundish refractory materials technology. It includes a stabilizer body with a circular inner cavity in the center. The inner cavity has stepped sides with a bottom-up design. A ring-shaped stabilizing protrusion is embedded at the corner of each step. Several evenly arranged turbulence blocks are fixedly mounted on the top surface of the steps and are fixedly connected to the stabilizing protrusions. An installation groove is provided at the bottom of the steps, and an impact plate is fixed within the groove. A first anti-floating protrusion and a second anti-floating protrusion are fixedly mounted at the lower part of the stabilizer body, with the second anti-floating protrusion positioned below the first. This utility model is rationally designed, effectively preventing erosion and damage to the sidewalls and bottom of the stabilizer caused by molten steel impact. It improves the overall stability and anti-erosion performance of the stabilizer structure, extends its service life, and ensures safe production in continuous casting tundishes.

Description

Technical Field

[0001] This utility model belongs to the technical field of refractory materials for tundishes, and specifically relates to an anti-erosion and anti-floating stabilizer for continuous casting tundishes. Background Technology

[0002] In the continuous casting tundish production process, the flow stabilizer is a core functional component for regulating the flow of molten steel and reducing slag entrainment. Traditional flow stabilizers consist of a sidewall and an impact plate, but they suffer from serious structural defects under long-term scouring by high-temperature molten steel. The middle and lower parts of the sidewall bear the most intense thermal scouring and erosion, and their erosion rate is significantly higher than other parts. When the erosion depth penetrates the wall, the overall structural strength of the sidewall decreases sharply. At this time, the buoyancy of the molten steel will push the damaged sidewall upward, leading to two major adverse consequences: First, the stability of the flow field inside the flow stabilizer is destroyed, the turbulence of the molten steel intensifies, the upward floating of inclusions is hindered, and the purity of the billet deteriorates; Second, the floating sidewall occupies the installation space of the long nozzle of the ladle, making it difficult to install the long nozzle or even impossible to align, forcing production to be interrupted.

[0003] Meanwhile, the reliability of the impact plate's fixation also faces severe challenges. Existing impact plates mostly rely on simple snap-fit ​​fixation, and their edge areas are prone to localized erosion under the continuous scouring of molten steel. When the refractory material around the fixing structure is worn away, the impact plate will displace from its original position under the combined action of the impact force and buoyancy of the molten steel, causing it to float or tilt. This phenomenon will cause the steel flow to directly impact the refractory material at the bottom of the tundish, accelerating the damage to the bottom of the tundish, and in severe cases, even causing a tundish penetration accident.

[0004] The dual floating problem of the sidewall and the impact plate has become a major safety hazard in the operation of the tundish: at best it will disrupt the production rhythm and increase maintenance costs, and at worst it will induce steel leakage accidents, posing a direct threat to the safety of equipment and personnel. Although the industry has tried to alleviate the problem by thickening the sidewall or improving the corrosion resistance of the material, it has failed to block the floating mechanism after corrosion penetration from the structural design.

[0005] Therefore, it is essential to provide an anti-erosion and anti-floating stabilizer for continuous casting tundishes that can simultaneously suppress the upward floating of the stabilizer sidewall due to penetration from the middle and lower parts and prevent the impact plate from falling off due to edge erosion. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous casting tundish anti-erosion and anti-floating stabilizer with an anti-seepage ring that is reasonably designed, has good anti-erosion performance, high structural stability, long service life, and ensures safe production.

[0007] The purpose of this utility model is achieved as follows: an anti-erosion and anti-floating flow stabilizer for continuous casting tundish, comprising a flow stabilizer body, an inner cavity with a circular shape in the middle of the flow stabilizer body, a stepped step from bottom to top on the side wall of the inner cavity, a ring-shaped flow stabilizing protrusion embedded at the corner of the step, a number of evenly arranged turbulence blocks fixedly disposed on the top surface of the step, the turbulence blocks being fixedly connected to the flow stabilizing protrusion, an installation groove provided at the bottom of the step, an impact plate fixedly disposed in the installation groove, and a first anti-floating protrusion and a second anti-floating protrusion fixedly disposed at the lower part of the flow stabilizer body, the second anti-floating protrusion being disposed below the first anti-floating protrusion.

[0008] Preferably, the inner cavity sidewall is a stepped structure from bottom to top, and the thickness of the inner cavity sidewall gradually decreases from bottom to top, with the width to height ratio of each step being 0.25:1 to 0.33:1.

[0009] Preferably, the flow stabilizing boss has a quarter-circular cross-section, and the side of the flow stabilizing boss is an arc-shaped surface facing the outside of the step. The ratio of the radius of the flow stabilizing boss cross-section to the width of the step is 0.25:1 to 0.5:1.

[0010] Preferably, the cross-section of the turbulence block is a semi-circular structure with the arc surface facing upwards, and the ratio of the diameter of the turbulence block cross-section to the step width is 0.75:1 to 1.2:1.

[0011] Preferably, the turbulence block, the flow stabilizing boss, and the step are all fixedly connected, and the flow stabilizing boss and the turbulence block are all made of high-chromium alloy material.

[0012] Preferably, the mounting groove and the impact plate are both cylindrical in shape with the same dimensions. The impact plate is fixedly embedded inside the mounting groove, and the center line of the impact plate coincides with that of the flow stabilizer body. The impact plate is made of magnesium carbon brick material.

[0013] Preferably, the first anti-buoyancy protrusion is an isosceles trapezoidal structure with its two inclined surfaces facing upwards, and the second anti-buoyancy protrusion has an inverted isosceles trapezoidal structure with its two inclined surfaces facing downwards. The angle between the inclined surfaces of the first and second anti-buoyancy protrusions and the horizontal plane is 30° to 45°.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model incorporates a stepped structure on the inner wall of the stabilizer. This stepped structure slows down the flow rate of molten steel, reduces the scouring intensity of the high-temperature molten steel on the side wall, and thus slows down the erosion rate. Furthermore, the stepped structure is designed to gradually thin from bottom to top, allowing the molten steel to gradually decelerate during its ascent, reducing turbulence caused by sudden changes in flow velocity and thus lowering the risk of inclusions. It also thickens the bottom side wall of the stabilizer, which bears the greatest impact force from the molten steel, effectively dispersing the impact energy, reducing local stress concentration, and preventing cracking or erosion of the stabilizer's side wall. In addition, the gradually thinning structure from bottom to top conforms to mechanical principles, ensuring bottom strength while reducing upper weight, lowering the overall center of gravity, improving the stability of the stabilizer, and reducing the amount of castable material used, effectively lowering production costs.

[0016] 2. This utility model employs a flow-stabilizing protrusion on a stepped platform. The semi-circular arc surface at the top of the flow-stabilizing protrusion can change the flow direction of molten steel on the platform surface. When the molten steel impacts the platform, the flow-stabilizing protrusion allows the molten steel to smoothly transition along its surface through diversion, avoiding direct impact on the turbulence or dead zone formed by the edge of the platform. This disperses the local stress generated by the impact of the molten steel, reducing the risk of cracking or spalling at the edge of the platform due to stress concentration. A flow-dispersing block is also installed on the stepped platform. The circular arc surface on the flow-dispersing block can also achieve a smooth transition of the molten steel direction, reducing the local resistance coefficient and energy loss. By slowing down the local flow velocity, the scouring intensity of the high-temperature molten steel at the corner is reduced, thereby slowing down the erosion rate. The coordinated action of the flow-dispersing block and the flow-stabilizing protrusion can jointly reduce the erosion of the platform by molten steel and improve the service life of the flow stabilizer.

[0017] 3. This utility model features an impact plate installed in the mounting groove at the bottom of the flow stabilizer, with the impact plate positioned at the exact center of the flow stabilizer. This ensures that the first point of impact of the molten steel is at the center of the impact plate. The impact plate can preferentially withstand the initial impact of the molten steel, forming a protective layer that protects the bottom structure of the flow stabilizer from high-speed erosion and thermal shock damage. The cylindrical structure of the impact plate can change the initial flow direction of the molten steel. After impacting the impact plate, the molten steel will diffuse evenly in all directions, forming a smoother circulation and avoiding turbulence or short-circuit flow caused by excessively high local flow velocities. This diffusion effect helps the molten steel to mix thoroughly within the flow stabilizer, improving temperature uniformity.

[0018] 4. This utility model provides a first anti-buoyancy boss and a second anti-buoyancy boss with an isosceles trapezoidal structure at the bottom of the stabilizer. The isosceles trapezoidal structure can generate a mechanical interlocking effect. Under the action of buoyancy or thermal stress, a shear-resistant interface is formed between the hypotenuse of the anti-buoyancy boss and the bottom refractory material, which significantly improves the overall shear resistance of the structure, reduces the floating of the stabilizer, and increases the stability of the overall structure of the stabilizer.

[0019] In summary, this utility model is reasonably designed, effectively avoiding erosion and damage to the sidewalls and bottom of the flow stabilizer caused by molten steel impact, improving the overall stability and erosion resistance of the flow stabilizer structure, extending the service life of the flow stabilizer, and ensuring the safe production of the continuous casting tundish. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the anti-erosion and anti-floating stabilizer for continuous casting tundish.

[0021] Figure 2 This is a cross-sectional schematic diagram of the anti-erosion and anti-floating stabilizer for continuous casting tundish of this utility model.

[0022] Figure 3 This utility model relates to an anti-erosion and anti-buoyancy stabilizer for continuous casting tundishes. Figure 2 A magnified view of a portion of point A in the middle.

[0023] Figure 4 This is a schematic diagram of the structure of the step of the anti-erosion and anti-floating stabilizer for continuous casting tundish.

[0024] Figure 5 This is a side view of the anti-erosion and anti-floating stabilizer for continuous casting tundish of this utility model.

[0025] Figure 6 This is an installation diagram of the anti-erosion and anti-floating stabilizer for continuous casting tundish.

[0026] In the figure: 1. Flow stabilizer body 101. Inner cavity 102. Mounting groove 2. Step 201. Flow stabilizing boss 202. Turbulence block 3. First anti-float boss 4. Second anti-float boss 5. Impact plate 6. Intermediate liner 7. Working layer. Detailed Implementation

[0027] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figure 1-6As shown, an anti-erosion and anti-floating flow stabilizer for continuous casting tundish includes a flow stabilizer body 1. The flow stabilizer body 1 has an inner cavity 101 in the middle, which is circular. The sidewall of the inner cavity 101 has a stepped platform 2 running from bottom to top. A ring-shaped flow stabilizing protrusion 201 is embedded at the corner of the step 2. Several evenly arranged turbulence blocks 202 are fixedly installed on the top surface of the step 2, and the turbulence blocks 202 are fixedly connected to the flow stabilizing protrusion 201. An installation groove 102 is provided at the bottom of the step 2, and an impact plate 5 is fixedly installed in the installation groove 102. A first anti-floating protrusion 3 and a second anti-floating protrusion 4 are fixedly installed at the lower part of the flow stabilizer body 1. The second anti-floating protrusion 4 is located below the first anti-floating protrusion 3. Several turbulence blocks 202 are used; the more turbulence blocks 202 there are, the more effectively the flow direction of the molten steel can be changed, reducing the impact on the step 2 itself, and thus reducing the impact on the sidewall of the flow stabilizer.

[0029] The inner cavity 101 has a stepped structure on the sidewall from bottom to top. The thickness of the inner cavity 101 sidewall gradually decreases from bottom to top. The ratio of the width to the height of each step 2 is 0.25:1 to 0.33:1.

[0030] The stepped structure slows down the flow rate of molten steel, reducing the scouring intensity of the high-temperature molten steel on the sidewalls and thus slowing down the erosion rate. Simultaneously, the stepped step 2 is designed to gradually thin from bottom to top, allowing the molten steel to gradually decelerate during its ascent, reducing turbulence caused by sudden changes in flow velocity and thus lowering the risk of inclusions. It also thickens the bottom sidewall of the stabilizer, which bears the greatest impact force from the molten steel, effectively dispersing impact energy, reducing local stress concentration, and preventing cracking or erosion of the stabilizer's sidewalls. Furthermore, the gradually thinning structure conforms to mechanical principles, ensuring bottom strength while reducing upper weight, lowering the overall center of gravity, and improving the stability of the stabilizer. It also reduces the amount of castable refractory used, effectively lowering production costs. The width-to-height ratio of each step 2 is 0.25:1 to 0.33:1. Within this range, the step 2 design can maximally reduce and disperse the impact from the molten steel, ensuring the overall stability of the stabilizer and the erosion resistance of the sidewalls.

[0031] Among them, the flow stabilizing boss 201 has a quarter-circular cross section, and the side of the flow stabilizing boss 201 is an arc-shaped surface facing the outside of the step 2. The ratio of the radius of the flow stabilizing boss 201 to the width of the step 2 is 0.25:1 to 0.5:1.

[0032] The semi-circular arc surface at the top of the flow stabilizing boss 201 can change the flow direction of molten steel on the surface of step 2. When the molten steel impacts step 2, the flow stabilizing boss 201 diverts the molten steel to smoothly transition along its surface, avoiding direct impact on the turbulence or dead zone formed by the edge of step 2. It can disperse the local stress generated by the impact of the molten steel, reducing the risk of cracking or spalling at the edge of step 2 due to stress concentration. The ratio of the radius of the cross section of the flow stabilizing boss 201 to the width of step 2 is 0.25:1 to 0.5:1, which can achieve the optimal flow stabilization effect, maximize the turbulence suppression and inclusion removal effect, reduce thermal shock damage, inhibit molten steel penetration, extend the service life of the flow stabilizer, and reduce maintenance costs.

[0033] Among them, the cross-section of the turbulence block 202 is a semi-circular structure with the arc surface facing upwards, and the ratio of the diameter of the cross-section of the turbulence block 202 to the width of the step 2 is 0.75:1 to 1.2:1.

[0034] The circular arc surface on the baffle block 202 can also achieve a smooth transition in the direction of the molten steel fluid, reduce the local resistance coefficient, reduce energy loss, and reduce the local flow velocity, thereby reducing the scouring intensity of the high-temperature molten steel fluid at the corner and thus slowing down the erosion rate. The ratio of the diameter of the baffle block 202 cross section to the width of the step 2 is set to 0.75:1 to 1.2:1. The baffle block 202 designed within this range can smooth the flow velocity of the molten steel to the maximum extent, optimize the impact of the molten steel to the greatest extent, reduce the damage of the baffle block 202, and improve its service life.

[0035] Among them, the turbulence block 202, the flow stabilizing boss 201 and the step 2 are all fixedly connected, and the flow stabilizing boss 201 and the turbulence block 202 are both made of high chromium alloy.

[0036] The flow stabilizing boss 201 and the turbulence block 202 are made of high-chromium alloy material. High-chromium alloy material has the characteristics of high temperature resistance and corrosion resistance. When the flow stabilizing boss 201 and the turbulence block 202 are subjected to impact damage when facing the impact of molten steel, the flow stabilizing boss 201 and the turbulence block 202 are made of this material. The turbulence block 202, the flow stabilizing boss 201 and the step 2 are all fixedly connected, which can improve the stability of the flow stabilizer and the tightness of the connection, further reduce the erosion and damage to the side wall of the flow stabilizer and improve its service life.

[0037] The mounting groove 102 and the impact plate 5 are both cylindrical in shape with the same size. The impact plate 5 is fixedly embedded in the mounting groove 102. The impact plate 5 coincides with the center line of the flow stabilizer body 1. The impact plate 5 is made of magnesium carbon brick material.

[0038] The impact plate 5 is positioned at the exact center of the flow stabilizer, ensuring that the first point of impact of the molten steel is at the center of the impact plate 5. The impact plate 5 can preferentially withstand the initial impact of the molten steel, forming a protective layer to protect the bottom structure of the flow stabilizer from high-speed erosion and thermal shock damage. The impact plate 5 has a cylindrical structure, which can change the initial flow direction of the molten steel. After the molten steel impacts the impact plate 5, it will diffuse evenly in all directions, forming a smoother circulation and avoiding turbulence or short-circuit flow caused by excessively high local flow velocities. This diffusion effect helps the molten steel to mix thoroughly in the flow stabilizer, improving temperature uniformity. The impact plate 5 is embedded inside the mounting groove 102. Since the mounting groove 102 is located at the bottom of the stepped step 2 and has the same size as the impact plate 5, it can provide tight protection for the edges of the impact plate 5, preventing the impact and erosion of the edges of the impact plate 5 by the molten steel.

[0039] The first anti-buoyancy protrusion 3 is an isosceles trapezoid with its two inclined surfaces facing upwards. The second anti-buoyancy protrusion 4 has an inverted isosceles trapezoid with its two inclined surfaces facing downwards. The angle between the inclined surfaces of the first anti-buoyancy protrusion 3 and the second anti-buoyancy protrusion 4 and the horizontal plane is 30° to 45°.

[0040] The isosceles trapezoidal structure can generate a mechanical interlocking effect. Under the action of buoyancy or thermal stress, a shear interface is formed between the inclined side of the anti-buoyancy boss and the bottom refractory material, which significantly improves the overall shear resistance of the structure, reduces the floating of the stabilizer, and increases the overall stability of the stabilizer structure. The angle between the inclined surface of the first anti-buoyancy boss 3 and the horizontal plane of the second anti-buoyancy boss 4 is 30° to 45°, which can increase the width of the base of the first anti-buoyancy boss 3 and the second anti-buoyancy boss 4. The wide base design increases the contact area between the anti-buoyancy boss and the working layer 7, reduces the risk of tensile stress concentration, and prevents cracking caused by thermal shock or mechanical impact. When molten steel impacts the impact plate 5 at the bottom of the stabilizer, the first anti-buoyancy boss 3 and the second anti-buoyancy boss 4, because they are embedded in the working layer 7, can also increase the stability of the stabilizer and prevent the stabilizer from floating due to long-term impact of molten steel.

[0041] The working principle of this utility model is as follows:

[0042] In use, the first anti-buoyancy protrusion 3 and the second anti-buoyancy protrusion 4 at the bottom of the stabilizer are embedded into the working layer 7 between the stabilizer and the tundish 6. Dry material is evenly applied around the first anti-buoyancy protrusion 3 and the second anti-buoyancy protrusion 4 to form an overall fixation of the stabilizer. Then, the stabilizer is mechanically fixed in other ways. After the stabilizer is fixed, the molten steel falling from the center directly above the inner cavity 101 of the stabilizer will first impact the center of the impact plate 5. Then, under the guiding action of the impact plate 5, it will spread to the periphery and side walls. Another part of the splashed molten steel will directly bounce onto the stepped steps 2 on the side wall of the stabilizer, avoiding damage to the bottom of the stabilizer. They will first impact the stabilizing protrusion 201 and the turbulence block 202. After the stabilizing protrusion 201 and the turbulence block 202 stabilize the flow of the molten steel, the impact and erosion of the molten steel are greatly reduced, avoiding erosion damage to the side wall.

[0043] In summary, this utility model is reasonably designed, effectively avoiding erosion and damage to the sidewalls and bottom of the flow stabilizer caused by molten steel impact, improving the overall stability and erosion resistance of the flow stabilizer structure, extending the service life of the flow stabilizer, and ensuring the safe production of the continuous casting tundish.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An anti-erosion and anti-floating flow stabilizer for continuous casting tundish, comprising a flow stabilizer body (1), characterized in that: The main body (1) of the flow stabilizer has an inner cavity (101) in the middle. The inner cavity (101) is circular. The side wall of the inner cavity (101) is provided with a stepped step (2) from bottom to top. A ring-shaped flow stabilizing boss (201) is embedded at the corner of the step (2). Several evenly arranged turbulence blocks (202) are also fixedly provided on the top surface of the step (2). The turbulence blocks (202) are fixedly connected to the flow stabilizing boss (201). The bottom of the step (2) is provided with an installation groove (102). An impact plate (5) is fixed in the installation groove (102). The lower part of the main body (1) of the flow stabilizer is fixedly provided with a first anti-float boss (3) and a second anti-float boss (4). The second anti-float boss (4) is located below the first anti-float boss (3).

2. The anti-erosion and anti-floating stabilizer for continuous casting tundish according to claim 1, characterized in that: The inner cavity (101) sidewall is a stepped structure from bottom to top, and the thickness of the inner cavity (101) sidewall gradually decreases from bottom to top. The ratio of the width to the height of each step (2) is 0.25:1 to 0.33:

1.

3. The anti-erosion and anti-floating stabilizer for continuous casting tundish according to claim 2, characterized in that: The flow stabilizing boss (201) has a quarter-circular cross section and an arc-shaped side facing the outside of the step (2). The ratio of the radius of the flow stabilizing boss (201) to the width of the step (2) is 0.25:1 to 0.5:

1.

4. The anti-erosion and anti-floating stabilizer for continuous casting tundishes according to claim 3, characterized in that: The cross-section of the turbulence block (202) is a semi-circular structure with the arc surface facing upwards. The ratio of the diameter of the cross-section of the turbulence block (202) to the width of the step (2) is 0.75:1 to 1.2:

1.

5. The anti-erosion and anti-floating stabilizer for continuous casting tundishes according to claim 4, characterized in that: The turbulence block (202), the flow stabilizing boss (201), and the step (2) are all fixedly connected, and the flow stabilizing boss (201) and the turbulence block (202) are both made of high chromium alloy.

6. The anti-erosion and anti-floating stabilizer for continuous casting tundish according to claim 1, characterized in that: The mounting groove (102) and the impact plate (5) are both cylindrical in shape with the same size. The impact plate (5) is fixedly embedded in the mounting groove (102). The impact plate (5) coincides with the center line of the stabilizer body (1). The impact plate (5) is made of magnesium carbon brick material.

7. The anti-erosion and anti-floating stabilizer for continuous casting tundish according to claim 1, characterized in that: The first anti-buoyancy protrusion (3) is an isosceles trapezoidal structure with its two sides facing upwards. The second anti-buoyancy protrusion (4) has an inverted isosceles trapezoidal structure with its two sides facing downwards. The angle between the slope of the first anti-buoyancy protrusion (3) and the horizontal plane of the second anti-buoyancy protrusion (4) is 30° to 45°.

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