Erosion-resistant structure of a ladle belt cover nozzle

Abstract

The utility model discloses a ladle belt cover water gap anti -erosion structure, including the ladle body, the lower end bottom of ladle body is installed with the upper water gap, the lower extreme of upper water gap is fixed with the steel shell, be equipped with the opening in the steel shell, install the ceramic inner lining in the opening, the outside one week of ceramic inner lining is nested with molybdenum net, be equipped with the delivery cavity in the ceramic inner lining, the delivery cavity is linked together with upper water gap, be equipped with the flow guide groove on one week lateral wall in the delivery cavity. The utility model discloses shorten the molten steel residence time and reduce the erosion rate, and enhance the shear strength of structure, greatly prolong the service life of lower water gap, reduced the replacement frequency, reduced the production cost, the stable spiral flow helps the molten steel more evenly flow, reduced the penetration and structural loose problem of slag, improved the quality and stability of molten steel pouring, thereby improved the quality of steel product.

Description

Technical Field

[0001] This utility model relates to the technical field of anti-corrosion structure for water inlets, and in particular to an anti-corrosion structure for a steel ladle with a cover for water inlets. Background Technology

[0002] In steel production, molten steel pouring is a crucial step, and the tundish nozzle, as a key component guiding the flow of molten steel, directly affects the quality and efficiency of the pouring, as well as the safety and cost of the entire production process. On one hand, molten steel has extremely high temperatures and corrosive properties, continuously eroding the outer iron shell of the tundish nozzle during pouring. Over time, the outer iron shell becomes increasingly corroded, significantly weakening the overall structural strength of the tundish nozzle. This not only shortens the nozzle's service life but also increases production costs due to frequent replacements, while simultaneously affecting production continuity and efficiency. On the other hand, molten slag seeps into the refractory material during pouring, making the nozzle structure porous. This porous structure reduces the nozzle's corrosion resistance and stability, thus affecting the quality and safety of the molten steel pouring. Therefore, we propose a erosion-resistant tundish nozzle structure with a cover to address these issues. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a steel ladle capped nozzle anti-corrosion structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A steel ladle with a covered water inlet anti-corrosion structure includes a steel ladle body, a water inlet installed at the bottom of the lower end of the steel ladle body, a steel shell fixed at the lower end of the water inlet, an opening inside the steel shell, a ceramic liner installed inside the opening, a molybdenum mesh nested around the outer perimeter of the ceramic liner, a conveying cavity inside the ceramic liner, the conveying cavity communicating with the water inlet, and a guide groove provided on the circumferential side wall of the conveying cavity.

[0006] Preferably, ceramic particles are embedded in the pores of the molybdenum mesh.

[0007] Preferably, the guide groove has a biomimetic thread structure, the pitch of the guide groove is 8-10mm, and the lead angle of the guide groove is 25°-35°.

[0008] Preferably, the thickness of the molybdenum mesh is 0.5-1 mm.

[0009] Preferably, the upper end of the steel shell is welded to the lower end of the water inlet.

[0010] In this utility model, raw materials such as a ceramic liner made of chromium corundum base material, a molybdenum mesh, and a steel shell are prepared. The ceramic liner is laser-etched to form a micron-level biomimetic threaded guide groove. The molybdenum mesh is placed between the chromium corundum liner and the steel shell. Then, a vacuum hot pressing process is used to process it. Under a certain pressure and temperature in a vacuum environment, the ceramic particles are embedded in the pores of the molybdenum mesh to form a mechanical interlocking structure, thus completing the assembly of the sprue. The assembled sprue is then welded to the lower end of the sprue on the steel ladle for molten steel pouring.

[0011] During the grouting process, molten steel forms a stable spiral flow through the guide channels of the ceramic lining, reducing erosion. Simultaneously, the molybdenum mesh enhances the structure's shear resistance, ensuring the stability of the nozzle during molten steel grouting. The guide channels form a biomimetic thread structure with a pitch of 8mm and a lead angle of 25°. When molten steel passes through this lining, the biomimetic thread structure guides the steel to form a stable spiral flow. This spiral flow reduces the residence time of the molten steel within the nozzle by 0.8 seconds, decreasing the contact time between the molten steel and the lining, thereby reducing the erosion rate by 35%. The 0.5mm thick molybdenum mesh is manufactured using a vacuum hot-pressing process, embedding ceramic particles into the mesh pores to form a mechanically interlocking structure, significantly improving the shear strength to 300MPa and enhancing the overall stability and reliability of the nozzle structure.

[0012] This utility model has the following advantages:

[0013] 1. By shortening the residence time of molten steel, reducing the erosion rate, and enhancing the shear strength of the structure, the service life of the outlet is greatly extended, the replacement frequency is reduced, and the production cost is lowered.

[0014] 2. A stable spiral flow helps molten steel flow more evenly, reduces slag penetration and structural looseness, improves the quality and stability of molten steel pouring, and thus enhances the quality of steel products.

[0015] 3. Improved structural stability and corrosion resistance reduce the risk of damage to the sprue during molten steel pouring, thus enhancing the safety of the production process;

[0016] In summary, this invention significantly extends the service life of the outlet by shortening the residence time of molten steel, reducing the erosion rate, and enhancing the shear strength of the structure. This reduces the frequency of replacement and lowers production costs. The stable spiral flow helps the molten steel flow more evenly, reduces slag penetration and structural loosening, and improves the quality and stability of molten steel pouring, thereby enhancing the quality of steel products. Attached Figure Description

[0017] Figure 1 This is an installation structure diagram of the present invention;

[0018] Figure 2 This is a diagram showing the internal structure of the steel shell of this utility model;

[0019] Figure 3 This is a diagram of the internal structure of the steel shell of this utility model;

[0020] Figure 4 A structural diagram showing the molybdenum mesh and ceramic particles of this utility model;

[0021] Figure 5 This is a diagram of the molybdenum mesh structure of this utility model;

[0022] Figure 6 This is a structural diagram of the ceramic liner of this utility model;

[0023] Figure 7 This is a structural diagram of the steel shell and water inlet of this utility model.

[0024] In the diagram: 1. Steel ladle cavity, 2. Steel ladle body, 3. Steel shell, 4. Guide channel, 5. Ceramic lining, 6. Molybdenum mesh, 7. Ceramic particles, 8. Water inlet, 9. Conveying chamber. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figure 1-7 A steel ladle with a covered nozzle anti-corrosion structure includes a steel ladle body 2, and an upper nozzle 8 is installed at the bottom of the lower end of the steel ladle body 2. The upper nozzle 8 serves to connect the steel ladle body with the lower nozzle structure and guide the molten steel to flow downward.

[0027] The lower end of the upper water inlet 8 is fixed with a steel shell 3. The steel shell 3 provides outer protection and support for the entire water inlet structure. The steel shell 3 has an opening, and a ceramic liner 5 is installed inside the opening. The ceramic liner 5 is made of chromium corundum-based material. Chromium corundum-based material has the advantages of high melting point, high hardness and good chemical stability, and can maintain good performance in the environment of high temperature molten steel.

[0028] A molybdenum mesh 6 is nested around the outer side of the ceramic liner 5. A conveying cavity 9 is provided inside the ceramic liner 5. The conveying cavity 9 is connected to the water inlet 8. A guide groove 4 is provided on the side wall of the conveying cavity 9.

[0029] Ceramic particles 7 are embedded in the pores of the molybdenum mesh 6. The guide groove 4 has a biomimetic thread structure with a pitch of 8-10 mm and a lead angle of 25°-35°. The biomimetic thread structure of the guide groove 4 can guide the molten steel to form a stable spiral flow, thereby reducing the erosion of the nozzle structure by the molten steel.

[0030] The thickness of the molybdenum mesh 6 is 0.5-1mm. The molybdenum mesh 6 is crucial for enhancing the shear resistance of the structure. At the same time, ceramic particles 7 are embedded in the pores of the molybdenum mesh 6, forming a mechanical interlocking structure, which can further improve the performance of the overall structure.

[0031] The upper end of the steel shell 3 is welded to the lower end of the water inlet 8. The welded connection can ensure a tight connection between the steel shell and the water inlet, prevent molten steel from leaking at the connection, and has high strength, which can withstand the pressure and impact of molten steel.

[0032] In this invention, raw materials such as a ceramic liner 5 made of chromium corundum base material, a molybdenum mesh 6, and a steel shell 3 are prepared. The ceramic liner 5 is laser-etched to form a micron-level biomimetic threaded guide groove. The molybdenum mesh 6 is placed between the chromium corundum liner and the steel shell, and then processed using a vacuum hot pressing process. Under a certain pressure and temperature in a vacuum environment, ceramic particles are embedded into the pores of the molybdenum mesh to form a mechanical interlocking structure, thus completing the assembly of the sprue. The assembled sprue is welded to the lower end of the sprue on the steel ladle, and molten steel is poured in. Laser etching technology is then used to process the sprue to form a micron-level biomimetic threaded guide groove. Laser etching technology has the characteristics of high precision and high controllability, and can accurately form the required biomimetic threaded guide groove on the surface of the ceramic liner, ensuring that the size and shape of the guide groove meet the design requirements.

[0033] During the grouting process, molten steel forms a stable spiral flow through the guide groove 4 of the ceramic liner 5, reducing erosion. Simultaneously, the molybdenum mesh 6 enhances the structure's shear resistance, ensuring the stability of the nozzle during molten steel grouting. The guide groove forms a biomimetic thread structure with a pitch of 8mm and a lead angle of 25°. When molten steel passes through this liner, the biomimetic thread structure guides the molten steel to form a stable spiral flow. This spiral flow shortens the residence time of the molten steel within the nozzle by 0.8 seconds, reducing the contact time between the molten steel and the liner, thereby reducing the erosion rate by 35%. The 0.5mm thick molybdenum mesh is produced using a vacuum hot-pressing process, embedding ceramic particles into the mesh pores to form a mechanically interlocking structure, significantly improving shear strength to 300MPa. This enhances the stability and reliability of the entire nozzle structure. The high shear resistance ensures the stability of the nozzle during molten steel grouting, further enhancing the overall stability and reliability of the nozzle structure.

[0034] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A steel ladle capped nozzle anti-corrosion structure, comprising a steel ladle body (2), characterized in that, The bottom of the steel ladle body (2) is equipped with a water inlet (8), and a steel shell (3) is fixed at the bottom of the water inlet (8). The steel shell (3) has an opening, and a ceramic liner (5) is installed in the opening. A molybdenum mesh (6) is nested around the outer side of the ceramic liner (5). A conveying cavity (9) is provided inside the ceramic liner (5). The conveying cavity (9) is connected to the water inlet (8). A guide groove (4) is provided on the side wall of the conveying cavity (9).

2. The anti-corrosion structure for a steel ladle with a covered nozzle according to claim 1, characterized in that: Ceramic particles (7) are embedded in the pores of the molybdenum mesh (6).

3. The anti-corrosion structure for a steel ladle with a covered nozzle according to claim 1, characterized in that: The guide groove (4) is a biomimetic thread structure. The pitch of the guide groove (4) is 8-10mm and the lead angle of the guide groove (4) is 25°-35°.

4. The anti-corrosion structure for a steel ladle with a covered nozzle according to claim 1, characterized in that: The thickness of the molybdenum mesh (6) is 0.5-1 mm.

5. The anti-corrosion structure for a steel ladle with a covered sprue according to claim 1, characterized in that: The upper end of the steel shell (3) is welded to the lower end of the water inlet (8).

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