Submersed nozzle

Abstract

The utility model belongs to the technical field of ferrous metallurgy, and discloses a submersed nozzle. The submersed nozzle comprises a bowl opening part, a discharge part, a body and a slag line part, the bowl opening part can extend into a tundish and communicate with the interior of the tundish, the tundish is filled with molten steel, the discharge part can extend into a crystallizer and communicate with the interior of the crystallizer, the crystallizer is used for solidifying the molten steel into a steel blank, and the slag line part is arranged on the body. The two ends of the body are communicated with the bowl opening part and the discharge part respectively, the slag line part comprises a slag line layer and a lining, the slag line layer and the lining are annularly arranged at the middle section position, in direct contact with the liquid level of molten steel and steel slag, of the body, the slag line layer is embedded inwards from the outer surface of the body, and the lining is embedded outwards from the inner surface of the body, so that the erosion resistance can be improved, and the service life can be prolonged; the immersion depth of the slag line part is prevented from being adjusted, long-time casting can be achieved at the same immersion depth, the molten steel quality is improved, and efficient and stable continuous casting production is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel metallurgy technology, and in particular to submerged entry nozzles. Background Technology

[0002] In continuous casting production, the submerged entry nozzle is the only channel for molten steel between the tundish and the crystallizer. It prevents oxidation and splashing of the molten steel, avoids the entrainment of protective slag into the molten steel, and prevents inclusions in the molten steel. The two ends of the submerged entry nozzle are connected to the tundish and the crystallizer, respectively. A stopper rod is installed in the tundish, and the central axis of the stopper rod is collinear with the central axis of the submerged entry nozzle. The stopper rod can move along the central axis of the submerged entry nozzle. The gap between the stopper rod head and the opening at the end of the submerged entry nozzle is the inlet for molten steel. Molten steel flows from the tundish through the submerged entry nozzle into the crystallizer.

[0003] Currently, with the continuous increase in the number of continuous casting furnaces, higher requirements are placed on the service life of submerged entry nozzles. The slag line section of the submerged entry nozzle is the part that is in direct contact with the surface of molten steel and slag, and is the most severely corroded. Existing submerged entry nozzles use multiple slag lines to extend their service life, but during the casting process, it is necessary to adjust the immersion depth of the slag line section to extend the service life. Adjusting the immersion depth may cause slag entrapment, affecting the quality of the cast billet.

[0004] Therefore, there is an urgent need for submersible sprues to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an immersion nozzle that can improve erosion resistance, extend service life, avoid adjusting the immersion depth of the slag line, allow for long-term casting at the same immersion depth, improve steel quality, and ensure efficient and stable continuous casting production.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An immersion nozzle includes: a bowl-shaped opening that extends into and communicates with the interior of a tundish filled with molten steel; a discharge section that extends into and communicates with the interior of a crystallizer configured to solidify the molten steel into a steel billet; a body whose two ends are respectively connected to the bowl-shaped opening and the discharge section; and a slag line section including a slag line layer and an inner lining. The slag line layer and the inner lining are arranged in a ring around the middle section of the body that is in direct contact with the molten steel and slag surfaces. The slag line layer is embedded inward from the outer surface of the body, and the inner lining is embedded outward from the inner surface of the body.

[0008] As an alternative, the thickness of the slag line layer is L1, and the thickness of the lining is L2, where L1 > L2.

[0009] As an alternative, the thickness of the middle section of the body is L3, and L3 > L1 + L2.

[0010] As an alternative, the thickness L1 of the slag line layer ranges from 5 to 10 mm, and the thickness L2 of the lining ranges from 5 to 10 mm.

[0011] As an alternative, the slag line section is constructed as a U-shaped annular structure, which also includes an annular connector. The outer ring of the annular connector is connected to the end of the slag line layer, and the inner ring of the annular connector is connected to the end of the lining.

[0012] As an alternative, the slag line section is made of carbon-free, dense zirconium oxide.

[0013] As an alternative, the slag line section is a one-piece molded structural component.

[0014] As an alternative, the slag line section can be connected to the main body via fire clay.

[0015] As an optional solution, the outer surface of the body is provided with a protective layer.

[0016] As an alternative, the opening on the side of the bowl facing away from the main body is an arc-shaped opening.

[0017] Beneficial effects:

[0018] This invention provides a submerged entry nozzle. During operation, the nozzle's bowl extends into the tundish and communicates with the interior of the tundish filled with molten steel. Molten steel flows through the body into the crystallizer via the discharge section. The slag line section is located in the middle section where the body directly contacts the molten steel and slag surfaces. The slag line layer is embedded from the outer surface of the body inwards, while the lining is embedded from the inner surface outwards. These two elements work together to protect the body, improving the submerged entry nozzle's corrosion resistance, extending its service life, eliminating the need to adjust the slag line's immersion depth, allowing for prolonged casting at the same immersion depth, improving steel quality, and ensuring efficient and stable continuous casting production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the immersion-type water inlet provided in an embodiment of this utility model.

[0020] In the diagram: 1. Bowl-shaped part; 11. Opening; 2. Body; 3. Slag line part; 31. Slag line layer; 32. Lining; 33. Annular connector; 4. Protective layer. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0025] Currently, in continuous casting production, the submerged entry nozzle is the only channel through which molten steel flows from the tundish to the crystallizer. It prevents oxidation and splashing of the molten steel, avoids the entrainment of protective slag into the molten steel, and prevents inclusions in the molten steel. The two ends of the submerged entry nozzle are connected to the tundish and the crystallizer, respectively. A stopper rod is installed in the tundish, and the central axis of the stopper rod is collinear with the central axis of the submerged entry nozzle. The stopper rod can move along the central axis of the submerged entry nozzle. The gap between the stopper rod head and the opening at the end of the submerged entry nozzle is the inlet for the molten steel. The molten steel flows from the tundish through the submerged entry nozzle into the crystallizer, where it is rapidly solidified into a steel billet.

[0026] This embodiment provides an immersion-type water inlet, such as Figure 1As shown, the submerged entry nozzle includes a bowl-shaped part 1, an outlet part (not shown), a body 2, and a slag line part 3. The bowl-shaped part 1 can extend into the tundish and communicate with the interior of the tundish. The tundish is filled with molten steel. The outlet part can extend into the interior of the crystallizer and communicate with the interior of the crystallizer. The crystallizer is used to solidify the molten steel into steel billets. The two ends of the body 2 are respectively connected to the bowl-shaped part 1 and the outlet part. The slag line part 3 includes a slag line layer 31 and an inner lining 32. The slag line layer 31 and the inner lining 32 are arranged in a ring around the middle section of the body 2 that is in direct contact with the molten steel and slag surface. The slag line layer 31 is embedded inward from the outer surface of the body 2, and the inner lining 32 is embedded outward from the inner surface of the body 2.

[0027] When the submerged entry nozzle is in operation, the nozzle bowl 1 extends into the tundish and communicates with the interior of the tundish filled with molten steel. Molten steel flows into the crystallizer through the body 2 from the discharge section. The slag line section 3 is located in the middle section where the body 2 is in direct contact with the molten steel and slag surface. The slag line layer 31 of the slag line section 3 is embedded from the outer surface of the body 2 inward, and the inner lining 32 of the slag line section 3 is embedded from the inner surface outward. The two work together to protect the body 2, which can improve the corrosion resistance of the submerged entry nozzle, extend the service life of the submerged entry nozzle, avoid adjusting the immersion depth of the slag line section 3, and allow for long-term casting at the same immersion depth, thereby improving the quality of molten steel and ensuring efficient and stable continuous casting production.

[0028] like Figure 1 As shown, the thickness of the slag line layer 31 is L1, and the thickness of the inner liner 32 is L2, where L1 > L2. The greater thickness of the slag line layer 31 (L1) compared to the inner liner 32 (L2) allows the outer slag line layer 31 to more effectively resist the scouring and erosion of high-temperature slag at the critical midpoint of the submerged entry nozzle where the molten steel and slag surfaces meet, ensuring the structural integrity of the submerged entry nozzle. The thinner inner liner 32, on the other hand, reduces material consumption and lowers costs while meeting the internal molten steel flow requirements. This thickness design optimizes the functional allocation of the slag line section 3, achieving a balance between protection and cost, extending the service life of the submerged entry nozzle, and ensuring a stable production process where molten steel flows smoothly from the tundish through the bowl section 1, the body 2, and the discharge section into the crystallizer.

[0029] like Figure 1As shown, the thickness of the middle section of the body 2 is L3, and L3 > L1 + L2. On the one hand, the thickness L3 of the middle section of the body 2 is greater than the sum of the thickness L1 of the slag line layer 31 and the thickness L2 of the inner lining 32, which ensures that the submerged entry nozzle has sufficient structural strength and stability to effectively withstand the high temperature and high pressure during the steel transfer process. On the other hand, this design allows the body 2 to provide reliable support for the slag line layer 31 and the inner lining 32 while being less prone to deformation and cracking. This ensures that the molten steel flows smoothly into the crystallizer through the bowl-shaped part 1, the body 2, and the discharge part, avoiding production interruption or molten steel leakage due to structural failure of the body 2. At the same time, it extends the overall service life of the submerged entry nozzle, reduces maintenance costs, and improves the continuity and safety of steelmaking production.

[0030] In this embodiment, the thickness L1 of the slag line layer 31 ranges from 5 to 10 mm, and the thickness L2 of the inner liner 32 ranges from 5 to 10 mm. This allows the submerged entry nozzle to obtain balanced and sufficient protection in the critical area where molten steel and slag come into contact. Within this thickness range, the slag line layer 31 can effectively resist the erosion and scouring of high-temperature slag, while the inner liner 32, within this thickness range, can ensure smooth steel delivery, reduce internal wear, prevent slag entrapment, and inhibit internal pore expansion. The appropriate thickness of the two layers ensures durability while avoiding increased material costs and weight of the submerged entry nozzle due to excessive thickness. This ensures the stability and reliability of the transmission channel composed of the bowl part 1, the body 2, and the discharge part, thereby improving steelmaking production efficiency and the service life of the submerged entry nozzle.

[0031] like Figure 1 As shown, the slag line section 3 is constructed as a U-shaped annular structure. This annular structure also includes an annular connector 33. The outer ring of the annular connector 33 connects to the end of the slag line layer 31, and the inner ring of the annular connector 33 connects to the end of the inner lining 32. The slag line section 3 uses a U-shaped annular structure, and the annular connector 33 connects the ends of the slag line layer 31 and the inner lining 32, forming a stable integrated structure. This effectively enhances the overall strength and stability of the slag line section 3, preventing detachment or misalignment of the slag line layer 31 and the inner lining 32 under the complex high-temperature and scouring environment of molten steel and slag surfaces, ensuring the slag line section 3 continues to provide protection. Simultaneously, the U-shaped annular structure can evenly distribute stress, and together with the annular connector 33, provides reliable external protection for the main body 2, ensuring the safety and stability of the molten steel transmission channel formed by the bowl section 1, the main body 2, and the discharge section.

[0032] In this embodiment, the length of the inner liner 32 is shorter than the length of the slag line layer 31. The longer slag line layer 31 can fully cover the external area severely corroded by steel slag, effectively resisting the scouring and abrasion of high-temperature steel slag; the shorter inner liner 32 reduces internal material consumption and lowers costs while ensuring smooth steel transport. This design allows the slag line section 3 to both strengthen external protection through the slag line layer 31 and achieve internal flow guidance through the inner liner 32, ensuring the stable operation of the steel transport channel formed by the bowl section 1, the body 2, and the discharge section, and extending the overall service life of the submerged nozzle.

[0033] In this embodiment, the slag line section 3 is made of carbon-free, dense zirconium oxide. The use of carbon-free, dense zirconium oxide in the slag line section 3 allows it to maintain a stable structure under high-temperature conditions at the surface of molten steel and slag, thanks to zirconium oxide's excellent high-temperature resistance and thermal shock resistance. The carbon-free nature significantly improves the erosion resistance and thermal stability of the submerged entry nozzle, preventing performance degradation caused by carbon oxidation and extending its service life. Simultaneously, it reduces the entry of impurities into the molten steel, improving the purity of the steel and thus enhancing the quality and performance of the steel. Furthermore, the dense structure greatly enhances its erosion resistance, resisting the scouring and abrasion of the slag line section 3, reducing wear and tear, extending the service life of the submerged entry nozzle, ensuring the stability and reliability of the molten steel transmission channel composed of the bowl section 1, the body 2, and the discharge section, reducing maintenance costs, and improving steelmaking production efficiency and billet quality.

[0034] In this embodiment, the slag line section 3 is a one-piece molded structural component. On one hand, the one-piece molded structure of the slag line section 3 avoids gaps and weak points that may exist in spliced ​​structures. Under the corrosive and scouring environment of high-temperature molten steel and slag, the one-piece design prevents structural damage caused by erosion at joints, effectively reducing the risk of leakage and significantly improving the overall strength and stability of the slag line section 3. On the other hand, this structure simplifies the manufacturing process, reduces assembly errors during production, ensures a tight fit between the slag line section 3 and the bowl section 1, the main body 2, and the discharge section, ensures the reliability of the molten steel transmission channel, extends the service life of the submerged entry nozzle, and improves the continuity and safety of steelmaking production.

[0035] In this embodiment, the slag line section 3 is a prefabricated component. On the one hand, it can be produced in a standardized factory environment, with strict control over its material, size, and performance to ensure quality stability and consistency. After prefabrication, it can be directly installed on-site, significantly shortening the assembly time of the submerged entry nozzle and reducing the production preparation cycle. On the other hand, prefabricated components facilitate inventory management. When the slag line section 3 reaches the end of its service life under the erosion of high-temperature molten steel and slag, it can be quickly replaced, reducing the costs caused by temporary processing or assembly. This ensures the continuous and stable operation of the molten steel transmission channel formed by the bowl section 1, the body 2, and the discharge section, thereby improving steelmaking production efficiency.

[0036] In this embodiment, the slag line section 3 can be connected to the body 2 via fire putty. On one hand, the connection between the slag line section 3 and the body 2 via fire putty utilizes the excellent plasticity and high-temperature bonding properties of the fire putty to achieve a tight fit between the slag line section 3 and the body 2, ensuring the sealing of the connection and preventing molten steel leakage. On the other hand, the fire putty hardens at high temperatures, effectively enhancing the structural strength and stability of the connection, allowing the slag line section 3 to work synergistically with the body 2 in resisting the erosion of molten steel and slag, thus forming an integrated structure between the slag line section 3 and the body 2 through the fire putty, extending the service life of the submerged nozzle.

[0037] like Figure 1 As shown, a protective layer 4 is provided on the outer surface of the main body 2. The protective layer 4 can reduce the wear and erosion of the main body 2, effectively resist the multiple effects of high temperature and slag erosion during the steelmaking process, prevent the main body 2 from directly contacting the external environment, significantly improve the structural integrity and durability of the submerged entry nozzle, and extend the overall service life of the submerged entry nozzle. At the same time, this design can reduce the overall replacement frequency and maintenance costs caused by damage to the main body 2, and improve the continuity and safety of steelmaking production.

[0038] In this embodiment, the protective layer 4 also wraps around the outside of the slag line layer 31, which can further enhance the protective capability of the slag line section 3 and add a barrier against the erosion of high-temperature steel slag. The protective layer 4 can effectively disperse the scouring and wear of the slag line layer 31, slow down the wear rate of the slag line layer 31, and extend the service life of the slag line section 3. At the same time, the protective layer 4 is closely attached to the slag line layer 31, which can evenly distribute thermal stress, avoid structural damage caused by local overheating, ensure the safety and reliability of the steel transfer channel composed of the bowl section 1, the body 2, and the discharge section, and improve the efficiency and continuity of steelmaking production.

[0039] like Figure 1 As shown, the opening 11 on the side of the bowl-shaped portion 1 facing away from the body 2 is an arc-shaped opening. On the one hand, the arc-shaped opening 11 reduces the resistance to molten steel flow, reduces eddy currents and splashing at the inlet, lowers the risk of secondary oxidation, and ensures the purity of the molten steel. It can effectively guide the molten steel in the tundish to flow more smoothly and steadily into the submerged entry nozzle, ensuring that the molten steel enters the crystallizer stably through the body 2 and the discharge section, thus improving the quality of the cast billet. On the other hand, the arc-shaped opening fits better with the stopper rod. A good fit allows for precise control of the molten steel flow rate, avoiding fluctuations in the molten steel flow rate caused by gaps, and ensuring that the molten steel flows steadily into the crystallizer through the body 2 and the discharge section, thus improving the quality of the cast billet.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An immersion-type sprue, characterized in that, include: The bowl-shaped part (1) can extend into the tundish and communicate with the interior of the tundish, which is filled with molten steel; The discharge section extends into and communicates with the interior of the crystallizer, which is configured to solidify the molten steel into a steel billet. The main body (2) has two ends connected to the bowl-shaped part (1) and the ejection part, respectively; The slag line section (3) includes a slag line layer (31) and an inner lining (32). The slag line layer (31) and the inner lining (32) are arranged in a ring around the middle section of the main body (2) that is in direct contact with the surface of the molten steel and slag. The slag line layer (31) is embedded inward from the outer surface of the main body (2), and the inner lining (32) is embedded outward from the inner surface of the main body (2).

2. The submersible water inlet according to claim 1, characterized in that, The thickness of the slag line layer (31) is L1, and the thickness of the inner lining (32) is L2, wherein L1 > L2.

3. The immersion-type water inlet according to claim 2, characterized in that, The thickness of the middle section of the body (2) is L3, and L3 > L1 + L2.

4. The submersible sprue according to claim 2, characterized in that, The thickness L1 of the slag line layer (31) ranges from 5 to 10 mm, and the thickness L2 of the inner lining (32) ranges from 5 to 10 mm.

5. The submersible sprue according to claim 1, characterized in that, The slag line section (3) is constructed as a U-shaped ring structure. The ring structure also includes an annular connector (33). The outer ring of the annular connector (33) is connected to the end of the slag line layer (31), and the inner ring of the annular connector (33) is connected to the end of the lining (32).

6. The submersible sprue according to any one of claims 1-5, characterized in that, The slag line section (3) is made of carbon-free, dense zirconium oxide.

7. The submersible sprue according to any one of claims 1-5, characterized in that, The slag line section (3) is an integrally formed structural component.

8. The submersible sprue according to any one of claims 1-5, characterized in that, The slag line section (3) can be connected to the main body (2) via fire mud.

9. The submersible sprue according to any one of claims 1-5, characterized in that, The outer surface of the body (2) is provided with a protective layer (4).

10. The submersible sprue according to any one of claims 1-5, characterized in that, The opening (11) on the side of the bowl-shaped part (1) facing away from the main body (2) is an arc-shaped opening.

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