Water nozzle for continuous casting

Abstract

The utility model belongs to the technical field of continuous casting of ferrous metallurgy, and discloses a nozzle for continuous casting. The nozzle for continuous casting comprises a steel shell, an outer-layer fire-resistant body, inner-layer fire clay and an inner-layer fire-resistant body which are sequentially arranged from outside to inside, the outer-layer fire-resistant body is fixedly connected to the inner side of the steel shell, the outer-layer fire-resistant body and the inner-layer fire-resistant body are bonded and fixed through the inner-layer fire clay, and a steel pouring channel is formed in the inner-layer fire-resistant body. According to the nozzle for continuous casting, when the inner-layer refractory body cracks and loses efficacy, the inner-layer refractory body can be replaced, so that the service life of the nozzle for continuous casting is prolonged, consumption of refractory materials can be reduced by only replacing the inner-layer refractory body, emission of solid waste is reduced, and the requirement for a high-cost steel shell is lowered; and the product cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting technology in iron and steel metallurgy, and in particular to a water inlet for continuous casting. Background Technology

[0002] The tundish nozzle is one of the most critical functional refractory materials in continuous casting production. It precisely regulates the water flow from the ladle to the tundish, balancing the inflow and outflow of molten steel, thus making continuous casting operations easier to control. It is an indispensable part of the smelting process. Existing continuous casting tundish nozzles include... Figure 1 and Figure 2 As shown, it includes a steel shell 10, a refractory body 20 fixed inside the steel shell 10, and a mounting fire putty 30 selectively provided for different materials of the refractory body 20. The steel shell 10 and the refractory body 20 can be bonded and fixed together by the mounting fire putty 30. A steel pouring channel 40 for molten steel to pass through is formed inside the refractory body 20.

[0003] The shortcomings of the above-mentioned continuous casting water inlet are:

[0004] 1. Short product life: Since the continuous casting nozzle is related to the service life of the ladle and tundish, there will be extreme cold and heat in each cycle, which can easily cause the refractory body to crack and fail. Therefore, the conventional nozzle has a limited life.

[0005] 2. Material waste: After each sprue fails and is discarded, the steel pouring channel 40 inside the product is covered with cold steel or steel slag, which is difficult to reuse. Therefore, it will cause waste of refractory material 20 and generate a large amount of solid waste.

[0006] 3. High cost: Steel shell 10 accounts for a high proportion of continuous casting nozzles. Its short service life will result in a large number of scrapped steel shell 10, causing cost losses.

[0007] Therefore, there is an urgent need to provide a continuous casting nozzle to solve the above problems. Utility Model Content

[0008] The purpose of this invention is to provide a continuous casting nozzle that improves the service life of the product. It reduces the consumption of refractory materials by simply replacing the inner refractory layer, thereby reducing the emission of solid waste, lowering the demand for high-cost steel shells, and significantly reducing product costs.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] A continuous casting nozzle includes a steel shell, an outer refractory body, an inner fire-resistant layer, and an inner refractory body arranged sequentially from the outside to the inside. The outer refractory body is fixedly connected to the inner side of the steel shell, and the outer refractory body and the inner refractory body are bonded and fixed together by the inner fire-resistant layer. A steel pouring channel is formed in the inner refractory body.

[0011] As an optional solution, the continuous casting nozzle also includes an outer layer of fire putty, which is located between the outer refractory body and the steel shell, and the outer refractory body and the steel shell are bonded and fixed together by the outer layer of fire putty.

[0012] As an optional option, the thickness of the outer fire clay layer is 0.5 mm to 3 mm.

[0013] As an alternative, the outer refractory body is made of one of the following materials: zirconium oxide, alumina, or aluminocarbon.

[0014] As an alternative, the inner refractory layer is made of one of the following materials: zirconium oxide, alumina, or aluminocarbon.

[0015] As an alternative, the outer refractory layer and the inner refractory layer are made of the same material;

[0016] Alternatively, the outer refractory layer and the inner refractory layer may be made of different materials.

[0017] As an alternative, the inner diameter of the inner layer of fire clay gradually decreases from top to bottom.

[0018] As an optional solution, the thickness of the steel shell is 0.5mm to 3mm.

[0019] As an optional solution, the thickness of the outer refractory layer is 10mm to 100mm.

[0020] As an optional solution, the thickness of the inner refractory layer is 10mm to 100mm.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a continuous casting nozzle. During manufacturing, a steel shell and an outer refractory layer are first prepared, and an inner refractory layer is prepared in advance. Then, inner refractory layer mortar is used to assemble the inner refractory layer onto the outer refractory layer. After curing, it can be used for continuous casting in the steel plant. After a certain service life, the inner refractory layer and its seams can be cleaned and removed directly at the steel plant. New inner refractory layer mortar is then applied, and the inner refractory layer is replaced before continuous casting can begin. Therefore, when the inner refractory layer cracks and fails, it can be replaced, thus extending the service life of the continuous casting nozzle. Furthermore, by replacing only the inner refractory layer, refractory material consumption is reduced, solid waste emissions are decreased, the demand for high-cost steel shells is reduced, and product costs are significantly lowered. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the structure of a continuous casting nozzle after partial cross-section, provided by existing technology.

[0024] Figure 2 This is a longitudinal sectional view of the continuous casting nozzle provided by existing technology;

[0025] Figure 3 This is a schematic diagram of the structure of the continuous casting nozzle after partial cross-section according to an embodiment of the present invention;

[0026] Figure 4 This is a longitudinal sectional view of the continuous casting nozzle provided in this embodiment of the utility model.

[0027] In the picture:

[0028] 10. Steel shell; 20. Refractory body; 30. Assembly mortar; 40. Steel casting channel;

[0029] 1. Steel shell; 2. Outer refractory layer; 3. Inner fire mortar layer; 4. Inner refractory layer; 5. Steel casting channel; 6. Outer fire mortar layer. Detailed Implementation

[0030] 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, not the entire structure.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The tundish nozzle is one of the most critical functional refractory materials in continuous casting production. It can precisely regulate the water flow from the ladle to the tundish, so that the inflow and outflow of molten steel can be balanced, making the continuous casting operation easier to control. It is an indispensable part of smelting.

[0035] like Figure 1 and Figure 2 As shown, the existing continuous casting nozzle includes a steel shell 10, a refractory body 20 fixed inside the steel shell 10, and assembly sealant 30 selectively configured for different materials of the refractory body 20. The steel shell 10 and the refractory body 20 can be bonded and fixed together by the assembly sealant 30. A pouring channel 40 for molten steel to pass through is formed inside the refractory body 20. The shortcomings of the above-mentioned continuous casting nozzle are: 1. Low product life: Since the continuous casting nozzle is related to the service cycle of the ladle and tundish, each cycle will have extremely cold and hot conditions, which can easily cause the refractory body 20 to crack and fail, so the conventional nozzle has a limited life; 2. Material waste: After each nozzle fails and is discarded, the pouring channel 40 inside the product is contaminated with cold steel or steel slag, which is difficult to recycle, thus causing waste of refractory body 20 material and generating a large amount of solid waste; 3. High cost: The steel shell 10 accounts for a high proportion of the continuous casting nozzle, and the low service life will lead to a large number of discarded steel shells 10, resulting in cost losses.

[0036] Therefore, in order to solve the above problems, such as Figure 3 and Figure 4 As shown, this embodiment provides a continuous casting nozzle, including a steel shell 1, an outer refractory body 2, an inner fire-resistant layer 3, and an inner refractory body 4 arranged sequentially from the outside to the inside. The outer refractory body 2 is fixedly connected to the inner side of the steel shell 1, and the outer refractory body 2 and the inner refractory body 4 are bonded and fixed together by the inner fire-resistant layer 3. A steel pouring channel 5 is formed in the inner refractory body 4, which is used to supply molten steel.

[0037] During manufacturing, a steel shell 1 and an outer refractory body 2 are first prepared using a production method, including but not limited to low-temperature curing under pressure, high-temperature firing under pressure, or casting. An inner refractory body 4 is also prepared in advance. Then, inner refractory body 4 is assembled onto the outer refractory body 2 using inner refractory putty 3. After curing, it can be used for continuous casting at the steel plant. After a certain service life, the inner refractory putty 3 and inner refractory body 4 can be cleaned and removed directly at the steel plant along the seams of the inner refractory putty 3. Then, new inner refractory putty 3 is applied, and a new inner refractory body 4 is replaced before re-continuous casting can begin.

[0038] Therefore, when the inner refractory body 4 cracks and fails, it can be replaced, thereby extending the service life of the continuous casting nozzle. Furthermore, by replacing only the inner refractory body 4, the consumption of refractory materials can be reduced, the emission of solid waste can be reduced, the demand for high-cost steel shell 1 can be reduced, and the product cost can be significantly reduced.

[0039] The inner layer fire putty 3 can be made of air-hardening or thermosetting materials, such as air-hardening sodium silicate refractory putty, chemically cross-linked phosphate-bonded refractory putty, etc., which makes the inner layer fire putty 3 have good plasticity, convenient construction, high bonding strength, high refractoriness, and good thermal spalling resistance.

[0040] Optionally, the continuous casting nozzle also includes an outer layer of fire putty 6, which is located between the outer refractory body 2 and the steel shell 1. The outer refractory body 2 and the steel shell 1 are bonded and fixed together by the outer layer of fire putty 6, making the connection between the outer refractory body 2 and the steel shell 1 stable. It should be noted that if the steel shell 1 does not have a mechanical connection to the outer refractory body 2, then the outer layer of fire putty 6 is required for bonding. If the steel shell 1 can be mechanically connected to the outer refractory body 2, such as by clamping or locking, then the outer layer of fire putty 6 may not be used.

[0041] Optionally, the thickness of the outer layer of fire putty 6 can be 0.5mm to 3mm. Specifically, the thickness of the outer layer of fire putty 6 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm, etc., and the thickness of the outer layer of fire putty 6 can be flexibly set according to actual needs. By setting the thickness of the outer layer of fire putty 6 within the above range, the adhesion can be guaranteed, ensuring the connection stability between the outer refractory body 2 and the steel shell 1. It should be noted that, by Figure 4 It can be seen that the thickness of the outer layer of fire clay 6 is not necessarily uniform from top to bottom. Therefore, the thickness of the outer layer of fire clay 6 only needs to vary within this range.

[0042] In one optional embodiment, the thickness of the steel shell 1 is 0.5mm to 3mm. Specifically, the thickness of the steel shell 1 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm, etc., and the thickness of the steel shell 1 can be flexibly set according to actual needs. By setting the thickness of the steel shell 1 within the above range, the overall structural strength of the sprue can be ensured.

[0043] like Figure 4 As shown, the inner diameter of the inner layer of fire clay 3 gradually decreases from top to bottom. The inclined arrangement of the inner layer of fire clay 3 can prevent the inner layer of refractory 4 from falling off after assembly.

[0044] In one optional embodiment, the outer refractory body 2 can be made of one of the following materials: zirconia, alumina, or alumina-carbon, such as a high-temperature sintered low-cement alumina castable. In another optional embodiment, the outer refractory body 2 can also be made of some common composite materials in the art, such as a high-temperature sintered ceramic-bonded alumina + zirconia + graphite material. Thus, the above-mentioned refractory materials are all high-quality refractory materials with good fire resistance, which can significantly improve the service life of the outer refractory body 2 and meet the requirements for long-term use.

[0045] In one optional embodiment, the thickness of the outer refractory layer 2 is 10mm to 100mm. Specifically, the thickness of the outer refractory layer 2 can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm, etc., and can be flexibly set according to actual needs. By setting the thickness of the outer refractory layer 2 within the above range, it avoids affecting its service life when the thickness of the outer refractory layer 2 is too thin, and also avoids material waste when the thickness of the outer refractory layer 2 is too thick. It should be noted that, by Figure 4 It can be seen that the thickness of the outer refractory body 2 is not necessarily uniform from top to bottom. Therefore, the thickness of the outer refractory body 2 only needs to vary within this range.

[0046] In one optional embodiment, the inner refractory layer 4 is made of one of the following materials: zirconia, alumina, or alumina-carbon. In another optional embodiment, the inner refractory layer 4 can also be made of some common composite materials in the art, such as resin-bonded alumina + graphite or low-cement alumina spinel. Thus, the above-mentioned refractory materials are all high-quality refractory materials with good fire resistance, which can significantly improve the service life of the inner refractory layer 4 and meet the requirements for long-term use.

[0047] In an optional embodiment, the thickness of the inner refractory layer 4 is 10mm to 100mm. Specifically, the thickness of the inner refractory layer 4 can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm, etc., and the thickness of the inner refractory layer 4 can be flexibly set according to actual needs. By setting the thickness of the inner refractory layer 4 within the above range, it is avoided that the service life will be affected if the thickness of the inner refractory layer 4 is too thin, and it is also avoided that the material will be wasted if the thickness of the inner refractory layer 4 is too thick. It should be noted that, by Figure 4 It can be seen that the thickness of the inner refractory body 4 is not necessarily uniform from top to bottom. Therefore, the thickness of the inner refractory body 4 only needs to vary within this range.

[0048] It should be noted that, in an optional embodiment, the outer refractory layer 2 and the inner refractory layer 4 can be made of the exact same material. Understandably, during the use of the sprue, the temperature of the inner refractory layer 4 (900-1600℃) is much higher than the temperature of the outer refractory layer 2 (200-600℃). If the outer refractory layer 2 and the inner refractory layer 4 use the same material, a significant performance difference will occur in the high-temperature to low-temperature range, thereby accelerating the failure of the sprue.

[0049] Therefore, in order to solve the above problems, in another optional embodiment, the outer refractory body 2 and the inner refractory body 4 can also be made of different materials. For example, the outer refractory body 2 mentioned above is made of alumina material, and the inner refractory body 4 is made of resin-bonded alumina + graphite material. Alumina material has high strength and wear resistance at 200-600℃, while resin-bonded alumina + graphite material has poor wettability to molten steel at 900-1600℃, is not easily corroded, has high thermal conductivity, and is not easily cracked due to thermal shock. Therefore, by selecting different materials for the outer refractory body 2 and the inner refractory body 4, they can exhibit optimal performance in different temperature ranges and mitigate the failure of the nozzle.

[0050] 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. A continuous casting nozzle, characterized in that, It includes a steel shell (1), an outer refractory body (2), an inner fire-resistant mortar (3), and an inner refractory body (4) arranged sequentially from the outside to the inside. The outer refractory body (2) is fixedly connected to the inside of the steel shell (1). The outer refractory body (2) and the inner refractory body (4) are bonded and fixed together by the inner fire-resistant mortar (3). A steel casting channel (5) is formed inside the inner refractory body (4).

2. The continuous casting nozzle according to claim 1, characterized in that, The continuous casting nozzle also includes an outer layer of fire putty (6), which is located between the outer refractory body (2) and the steel shell (1). The outer refractory body (2) and the steel shell (1) are bonded and fixed together by the outer layer of fire putty (6).

3. The continuous casting nozzle according to claim 2, characterized in that, The thickness of the outer fire clay (6) is 0.5 mm to 3 mm.

4. The continuous casting nozzle according to claim 1, characterized in that, The outer refractory body (2) is made of one of the following materials: zirconium oxide, alumina, or alumina-carbon.

5. The continuous casting nozzle according to claim 1, characterized in that, The inner refractory body (4) is made of one of the following materials: zirconium oxide, alumina, or alumina-carbon.

6. The continuous casting nozzle according to any one of claims 1-5, characterized in that, The outer refractory body (2) and the inner refractory body (4) are made of the same material; Alternatively, the outer refractory layer (2) and the inner refractory layer (4) may be made of different materials.

7. The continuous casting nozzle according to any one of claims 1-5, characterized in that, The inner diameter of the inner layer of fire clay (3) gradually decreases from top to bottom.

8. The continuous casting nozzle according to any one of claims 1-5, characterized in that, The thickness of the steel shell (1) is 0.5 mm to 3 mm.

9. The continuous casting nozzle according to any one of claims 1-5, characterized in that, The thickness of the outer refractory body (2) is 10mm to 100mm.

10. The continuous casting nozzle according to any one of claims 1-5, characterized in that, The thickness of the inner refractory body (4) is 10mm to 100mm.

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