Intrusive long nozzle

Abstract

The utility model provides an intrusive long nozzle. The intrusive long nozzle is sequentially divided into a wrist section and a slag line section from top to bottom; the wrist section is funnel-shaped, and two lifting lugs are arranged at the upper end of the wrist section; a slag breaking cap is arranged at the lower end of the slag line section; the wrist section fixing seat is arranged at a sprue gate of a refining ladle cover plate, and the slag section extends into the refining ladle; the overall height of the wrist section and the slag line section is 1800-2200 mm, and the inner diameter of the water gap is 100-150 mm. According to the intrusive long nozzle, the problem that an existing intrusive long nozzle is not suitable for a refining ladle can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shrouds, and more specifically relates to an invasive shroud for vacuum direct pouring of multiple molten steel refining ladles. Background Art

[0002] Currently, invasive shrouds are primarily used in the tundish of continuous casting lines in steel mills to prevent splashing, slag entrainment, and secondary oxidation of molten steel entering the tundish from the ladle. These tundishes are flat and typically coated with a tundish coating. Due to continuous pouring, the molten steel level remains relatively stable, resulting in invasive shroud lengths typically under one meter. Furthermore, without the presence of highly corrosive refining slag, these invasive shrouds have low corrosion resistance and flexural strength, making them impractical for direct insertion into the ladle.

[0003] To achieve direct vacuum pouring of multiple tundishes of molten steel using a refining ladle, the first refining ladle needs to be used as a seat ladle. At this time, the first refining ladle contains 300-400mm thick refining slag, and the molten steel level fluctuates significantly during the pouring process. Furthermore, because the refining ladle requires vacuum degassing, the height of the molten steel level from the ladle opening is over 1400mm. Conventional tundishes with invasive shrouds have difficulty achieving slag breaking and resisting slag erosion. If slag breaking is unsuccessful or erosion is severe, these inclusions will be drawn into the molten steel under the impact of the molten steel, seriously affecting product quality. Utility Model Content

[0004] The utility model aims to solve the problem that the existing invasive shroud is not suitable for refining ladles.

[0005] In order to achieve the above object, the utility model provides an intrusive shroud, which is divided into a wrist section and a slag line section from top to bottom;

[0006] The wrist section is funnel-shaped, and two lifting ears are provided at the upper end of the wrist section;

[0007] The slag line segment is in a conical cylindrical shape, and a slag breaking cap is provided at the lower end of the slag line segment;

[0008] The wrist segment is fixedly mounted on the pouring port of the refining ladle cover, and the slag line segment extends to the interior of the refining ladle;

[0009] The overall height of the wrist segment and the slag line segment is 1800-2200 mm, and the inner diameter of the nozzle is 100-150 mm.

[0010] Optionally, the height of the wrist segment is 600 mm, and a carbon iron layer is provided on the outer side of the wrist segment.

[0011] Optionally, the wrist segment is divided into a straight segment, a backing segment, a contraction segment and a reinforcement segment from top to bottom;

[0012] The height of the straight section is 150 mm and the outer diameter is 405 mm;

[0013] and / or, the outer shape of the backing section converges from top to bottom at an inclination angle of 45°;

[0014] and / or, the outer diameter of the contraction section contracts from 351 mm to 255 mm from top to bottom;

[0015] And / or, the height of the reinforcement section is 210 mm.

[0016] Optionally, the inner diameter of the pouring inlet of the wrist segment is 320 mm and converges downward to 100-150 mm at an inclination angle of 75°.

[0017] Optionally, the height of the slag line segment is 1200-1600 mm, and the inner diameter of the bottom water outlet is 100-150 mm;

[0018] The outer diameter of the slag line segment shrinks from 255 mm to 218 mm from top to bottom.

[0019] Optionally, the slag breaking cap is made of carbon iron sheet.

[0020] Optionally, the wrist segment and the slag line segment are an integrally formed structure.

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

[0022] The invasive shroud of the utility model can be directly inserted into the interior of the refining ladle, can resist the erosion of the refining ladle and the disturbance caused by the flow of molten steel during the pouring process, has a simple and reliable structure and is easy to use.

[0023] The use of the invasive shroud of the utility model can realize vacuum direct pouring of multiple molten steel refining ladles. In actual application, after 20 consecutive uses, the invasive shroud can effectively penetrate the refining slag layer, and there is no obvious refining slag invasion inside the shroud. 20 large steel ingots using this process are all qualified, successfully solving the problem of using the invasive shroud in the refining ladle.

[0024] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention can be better understood by referring to the following description made in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to represent the same or similar components.

[0026] Figure 1 A cross-sectional view of an invasive shroud according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to more fully understand the technical solution of the present invention, the exemplary embodiments of the present invention will be described in more comprehensive and detailed in conjunction with the accompanying drawings below. Obviously, the one or more embodiments of the present invention described below are only one or more of the specific ways of implementing the technical solution of the present invention, and are not exhaustive. It should be understood that other ways belonging to a general utility model concept can be used to implement the technical solution of the present invention, and should not be limited by the exemplary embodiments described. Based on one or more embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0028] Example: Figure 1 The cross-sectional view of the intrusive shroud of the embodiment of the present invention is shown. Figure 1 The invasive shroud of the embodiment of the utility model is fixed in the pouring port of the refining ladle cover plate to realize the pouring of multiple molten steel ladles;

[0029] The intrusive shroud is divided into wrist section 1 and slag line section 2 from top to bottom;

[0030] The wrist segment 1 is funnel-shaped, and two lifting ears 3 are provided at the upper end of the wrist segment 1;

[0031] The slag line segment 2 is in a conical cylindrical shape, and a slag breaking cap 4 is provided at the lower end of the slag line segment 2;

[0032] The wrist segment 1 is fixed to the pouring port of the refining ladle cover, and the slag line segment 2 extends to the interior of the refining ladle;

[0033] The overall height of the wrist segment 1 and the slag line segment 2 is 1800 mm, and the inner diameter of the nozzle is 150 mm.

[0034] Specifically, in the embodiment of the present invention, the two lifting lugs 3 are used for lifting and installing the invasive shroud.

[0035] Furthermore, in the embodiment of the present invention, the height of the wrist segment 1 is 600 mm, and a carbon iron layer is provided on the outer surface of the wrist segment 1 .

[0036] Specifically, in the embodiment of the present invention, the thickness of the carbon iron layer on the outer side of the wrist segment 1 is 3 mm, which is used to enhance the overall performance of the wrist forging 1.

[0037] Furthermore, in the embodiment of the present invention, the wrist segment 1 is divided into a straight segment 6, a backing segment 7, a contraction segment 8 and a reinforcement segment 9 from top to bottom;

[0038] The height of the straight section 6 is 150 mm and the outer diameter is 405 mm;

[0039] and / or, the outer shape of the backing section 7 converges from top to bottom at an inclination angle of 45°;

[0040] and / or, the outer diameter of the contraction section 8 contracts from 351 mm to 255 mm from top to bottom;

[0041] And / or, the height of the reinforcement section 9 is 210 mm.

[0042] Specifically, in the embodiment of the present invention, the backing section 7 matches the corresponding supporting portion in the pouring port of the refining ladle cover plate in appearance, and the backing section 7 abuts against the supporting portion.

[0043] Furthermore, in the embodiment of the present invention, the inner diameter of the pouring inlet 5 of the wrist segment 1 is 320 mm, and converges downward to 150 mm at an inclination angle of 75°, that is, the inner diameter of the nozzle is shrunk to 150 mm, which is used for the pouring inlet of molten steel from a hanging ladle.

[0044] Furthermore, in the embodiment of the present invention, the height of the slag line segment 2 is 1200 mm, and the inner diameter of the bottom water outlet 10 is 150 mm;

[0045] The outer diameter of slag line segment 2 shrinks from 255 mm to 218 mm from top to bottom, which is convenient for demoulding of the invasive long nozzle.

[0046] Furthermore, in the embodiment of the present invention, the slag breaking cap 4 is made of carbon iron sheet.

[0047] Specifically, in this embodiment of the present invention, a slag breaker cap 4 is provided around the bottom water outlet 10. Made of 3mm thick carbon iron sheet, the slag breaker cap 4 is used to penetrate the refining slag within the ladle and prevent it from entering the shroud. It then rapidly melts in the high-temperature molten steel, reducing the quality risk of slag being flushed into the bottom of the ladle by the molten steel.

[0048] Furthermore, in the embodiment of the present invention, the wrist segment 1 and the slag line segment 2 are an integrally formed structure.

[0049] Specifically, in the embodiment of the present invention, the wrist segment 1 and the slag line segment 2 are formed by isostatic pressing and are made of aluminum-carbon material, specifically, Al2O3 content of 40% to 50%, FC content of 15% to 25%, and bulk density of 2.4 to 2.6 / cm 3, apparent porosity 15% ~ 20%, room temperature compressive strength ≥ 20MPa, room temperature tensile strength ≥ 6MPa, seismic stability ≥ 5 times (1100 ℃, water cooling).

[0050] Although one or more embodiments of the present invention have been described above, it should be understood by those skilled in the art that the present invention can be implemented in any other form without departing from its spirit and scope. Therefore, the embodiments described above are illustrative and not restrictive, and many modifications and substitutions will be apparent to those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An invasive shroud, characterized in that: The intrusive shroud is divided into a wrist section and a slag line section from top to bottom; The wrist section is funnel-shaped, and two lifting ears are provided at the upper end of the wrist section; The slag line segment is in a conical cylindrical shape, and a slag breaking cap is provided at the lower end of the slag line segment; The wrist segment is fixedly mounted on the pouring port of the refining ladle cover, and the slag line segment extends to the interior of the refining ladle; The overall height of the wrist segment and the slag line segment is 1800-2200 mm, and the inner diameter of the nozzle is 100-150 mm.

2. The invasive shroud according to claim 1, characterized in that: The height of the wrist segment is 600 mm, and a carbon iron layer is provided on the outer side of the wrist segment.

3. The invasive shroud according to claim 2, characterized in that: The wrist section is divided into a straight section, a backing section, a contraction section and a strengthening section from top to bottom; The height of the straight section is 150 mm and the outer diameter is 405 mm; and / or, the outer shape of the backing section converges from top to bottom at an inclination angle of 45°; and / or, the outer diameter of the contraction section contracts from 351 mm to 255 mm from top to bottom; And / or, the height of the reinforcement section is 210 mm.

4. The invasive shroud according to claim 3, characterized in that: The inner diameter of the pouring inlet of the wrist segment is 320 mm, and converges downward to 100-150 mm at an inclination angle of 75°.

5. The invasive shroud according to claim 4, characterized in that: The height of the slag line section is 1200-1600 mm, and the inner diameter of the bottom water outlet is 100-150 mm; The outer diameter of the slag line segment shrinks from 255 mm to 218 mm from top to bottom.

6. The invasive shroud according to claim 5, characterized in that: The slag breaking cap is made of carbon iron sheet.

7. The invasive shroud according to claim 6, characterized in that: The wrist segment and the slag line segment are an integrally formed structure.

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