Three-flow slab continuous casting tundish capable of reducing casting residue

Abstract

The utility model relates to a three-flow slab continuous casting tundish capable of reducing casting residues, and belongs to the technical field of continuous casting equipment in the metallurgical industry. According to the technical scheme, a retaining wall (4) is in a circular arc shape, the retaining wall (4) is arranged in a ladle shell (1), the ladle shell (1) is divided into an impact area (2) and a flow injection area (7) through the retaining wall (4), the inner wall (19) of the retaining wall (4) and the inner wall (19) of the impact area (2) are integrally poured components, a supporting rod (9) is arranged between the retaining wall (4) and the inner wall of the ladle shell (1), a flow guide hole (16) for molten steel to flow from the impact area (2) to the flow injection area (7) is formed in the retaining wall (4), and a flow stabilizer (3) is arranged in the impact area (2). And three tapping holes are formed in the flow injection area (7), a blocking dam is arranged among the tapping holes, and flow injection holes (18) are formed in the blocking dam. The tundish has the advantages that the impact force of steel flow in the impact area can be better relieved, less tundish casting residues are left, and the molten steel yield is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a three-flow slab continuous casting tundish reducing casting surplus belongs to metallurgical industry continuous casting equipment technical field. BACKGROUND

[0002] With the expansion of converter capacity and the shortening of smelting time, the steelmaking production capacity is continuously improved, and the continuous casting production capacity must also be improved to meet the steelmaking production. In the metallurgical field, most of the continuous casting slab machines use single-flow slab, and a few use double-flow slab, but the double-flow slab cannot meet the production demand of fast rhythm of large converter. Therefore, a three-flow slab tundish for high-yield continuous casting needs to be developed.

[0003] The tundish connects the ladle and the crystallizer in the continuous casting process and plays a role of connecting the previous and the next. The main functions are: (1) reducing the static pressure of molten steel, maintaining the stable molten steel level of the tundish, and smoothly pouring the molten steel into the crystallizer; (2) promoting the floating of inclusions and purifying the molten steel; (3) distributing the molten steel: for multi-flow continuous casting machine, the molten steel is distributed to each crystallizer through the tundish; (4) storing molten steel to create conditions for multi-ladle continuous casting.

[0004] At present, the tundish used is mostly rectangular tundish, which can only be applied to single-flow or double-flow slab and cannot be applied to three-flow slab. Patent No. China Invention Patent "Three-machine three-flow slab continuous casting tundish", application number: CN201720366794.2, application date: April 10, 2017, discloses a three-machine three-flow slab continuous casting tundish, which comprises: a tundish body, a U-shaped baffle, upper support bricks, lower support bricks, flow guide holes, dams, and turbulence suppressors. The baffle uses a U-shaped baffle supported by upper support bricks and lower support bricks, and uses a solid dam. However, the continuous casting tundish with this structure directly impacts the stopper area after the molten steel passes through the flow guide hole, which makes the stopper flow control unstable, disturbs the crystallizer flow field, and the cast slab is easy to stick under high pulling speed; the full solid baffle is used for the baffle, and after the tundish is poured, there is more steel left in the tundish, the molten steel recovery rate is reduced, the ton steel cost is increased, and the impact resistance of the U-shaped baffle is low. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a three-flow slab continuous casting tundish reducing casting surplus, which can better alleviate the impact of the impact area steel flow, leave less tundish casting surplus, improve the molten steel recovery rate, and solve the problems in the background art.

[0006] The technical scheme of the utility model is:

[0007] A three-flow slab continuous casting tundish for reducing casting residue comprises a tundish shell, an impact area, a flow stabilizer, a baffle, a injection area, a flow guide hole and an injection hole, the baffle is circular arc-shaped, the baffle is arranged in the tundish shell, the baffle divides the tundish shell into the impact area and the injection area, the baffle and the inner wall of the impact area are integrally cast components, support rods are arranged between the baffle and the inner wall of the tundish shell, the baffle is provided with the flow guide hole for guiding the molten steel from the impact area to the injection area, the flow stabilizer is arranged in the impact area, three tapping holes are arranged in the injection area, dams are arranged between the tapping holes, and the dams are provided with the injection holes.

[0008] Further, the flow guide hole is arranged upwardly inclined.

[0009] Further, the flow guide hole is arranged upwardly inclined at an angle of 15 degrees.

[0010] Further, the baffle is provided with a slag discharge groove.

[0011] Further, the slag discharge groove is arranged at the upper portion of the baffle, and the flow guide hole is arranged at the lower portion of the baffle.

[0012] Further, the tundish shell is of a T-shaped structure.

[0013] Further, two support grooves are arranged on the baffle, one end of each of the two support rods is arranged on the inner wall of the tundish, and the other end of each of the two support rods is arranged on the support groove, and the two support rods are arranged horizontally and in parallel.

[0014] Further, the upper portion of the tundish shell is provided with an overflow groove.

[0015] The present utility model has the advantages that the impact force of the steel flow in the impact area can be better relieved, the casting residue of the tundish is less, the yield of the molten steel is improved, the molten steel flow field of the tundish is changed, the molten steel directly impacting the stopper rod head is avoided, the casting blank sticking caused by the unstable flow field of the crystallizer is eliminated, the baffle is more stable, the risk of the baffle being impacted and collapsed by the molten steel is avoided, the inner wall of the baffle and the impact area is an integrally cast component, and the impact resistance of the baffle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a top view structural schematic diagram of the present utility model;

[0017] Figure 2 It is a front view structural schematic diagram of the baffle of the present utility model;

[0018] Figure 3 It is a rear view sectional schematic diagram of the impact area of the present utility model;

[0019] Figure 4 It is a structural schematic diagram of the dam of the present utility model;

[0020] In the figure: 1, the shell; 2, impact area; 3, flow stabilizer; 4, retaining wall; 5, a flow outlet; 6, a retaining dam; 7, injection flow area; 8, a retaining dam; 9, support rod; 10, two flow outlets; 11, a retaining dam; 12, a retaining dam; 13, three flow outlets; 14, slag channel; 16, flow guide hole; 17, support groove; 18, injection hole; 19, inner wall; 20, overflow groove. DETAILED DESCRIPTION

[0021] The utility model will be further described by examples in connection with the drawings.

[0022] Refer to the drawings Figures 1-4 A three-flow slab continuous casting tundish for reducing casting residue comprises a shell 1, an impact area 2, a flow stabilizer 3, a retaining wall 4, an injection flow area 7, a flow guide hole 16 and an injection hole 18. The retaining wall 4 is circular arc-shaped, is arranged in the shell 1, divides the shell 1 into the impact area 2 and the injection flow area 7, and is an integrally cast component together with the inner wall 19 of the impact area 2. A support rod 9 is arranged between the retaining wall 4 and the inner wall of the shell 1. The retaining wall 4 is provided with the flow guide hole 16 for guiding the molten steel from the impact area 2 to the injection flow area 7. The flow stabilizer 3 is arranged in the impact area 2, and three outlets are arranged in the injection flow area 7. Retaining dams are arranged between the outlets, and the injection holes 18 are arranged on the retaining dams.

[0023] In this example, refer to the drawings Figures 1-4 The three-flow slab continuous casting tundish comprises a tundish shell 1 and a tundish internal structure. The tundish shell 1 adopts a T-shaped structure, and a retaining wall 4 is arranged at the transition of the T-shaped structure. The retaining wall 4 divides the tundish interior into an impact area 2 and an injection flow area 7. The impact area 2 is an integrally cast component composed of the retaining wall 4 and the inner wall 19 of the impact area, can well resist the impact of the molten steel on the retaining wall 4, and can avoid the collapse of the retaining wall 4 during casting. The retaining wall 4 is circular arc-shaped, has better stability and impact resistance than a polygonal retaining wall.

[0024] The flow stabilizer 3 is arranged at the bottom of the impact area 2. The flow stabilizer 3 is a cuboid, and the upper opening of the flow stabilizer 3 is flush with the bottom of the impact area, and the depth is 100 mm. The flow stabilizer 3 is a commonly used device in the art, and is used for adjusting and controlling the stable flow of fluid.

[0025] Two symmetrical flow guide holes 16 are formed in the baffle wall 4. Molten steel in the impact area 2 flows into the pouring area 7 through the flow guide holes 16. The flow guide holes 16 are cuboids with a length of 300 mm and a height of 350 mm. The distance between the flow guide holes and the bottom of the tundish is 350 mm. The bottom of the flow guide holes is flush with the bottom of the impact area. The flow guide holes are inclined upward with a horizontal angle of 15°. The angle between the flow guide holes and the axis of the tundish is 60°. After flowing into the pouring area 7 through the flow guide holes 16, the molten steel moves upward obliquely, returns to the opposite side after hitting the inner wall of the tundish, and forms a zigzag movement in the tundish, thereby prolonging the residence time of the molten steel in the tundish and promoting the floating of inclusions in the molten steel to purify the molten steel. The flow guide holes 16 are flush with the bottom of the impact area, so that all the molten steel in the impact area can flow into the pouring area 7 at the end of pouring.

[0026] Two support grooves 17 are formed in the upper surface of the baffle wall 4. The support grooves 17 are embedded to a depth of half the thickness of the baffle wall 4. Two support rods 9 are installed at one end on the inner wall of the tundish and at the other end in the support grooves 17. The support rods 9 are installed horizontally. The support rods 9 can enhance the resistance of the baffle wall 4 to the impact of the molten steel, making the baffle wall 4 more stable.

[0027] Three tapping holes are located on a line in the pouring area 7 and are labeled as a first tapping hole 5, a second tapping hole 10, and a third tapping hole 13 from left to right. The dams are installed at the bottom of the tundish and are embedded in the inner wall of the tundish. The first dam 6 is installed to the right of the first tapping hole 5 with a distance of 500 mm. The second dam 8 and the third dam 11 are installed on both sides of the second tapping hole 10 with a distance of 500 mm from the second tapping hole 10. The fourth dam 12 is installed to the left of the third tapping hole 13 with a distance of 500 mm. The four dams have the same structure. Each dam has a height of 300 mm and is embedded in the working layer of the continuous casting tundish in the length direction. The bottom of each dam has two semicircular flow guide holes 18 with a diameter of 100 mm. The dams are installed near each tapping hole to block the direct impact of the steel flow on the stopper rod head, thereby stabilizing the flow field of the mold. Two identical flow guide holes 18 are provided on each dam. When the height of the molten steel in the tundish is lower than the dam at the end of pouring, the molten steel can flow into each tapping hole through the flow guide holes 18, thereby reducing the remaining amount of molten steel to the minimum and improving the yield of molten steel.

Claims

1. A three-strand slab continuous casting tundish for reducing the amount of scrap, characterized by: The application relates to a tundish, which comprises a shell (1), an impact area (2), a flow stabilizer (3), a baffle wall (4), a pouring area (7), a flow guide hole (16) and a pouring hole (18), the baffle wall (4) is in a circular arc shape, the baffle wall (4) is arranged in the shell (1), the baffle wall (4) divides the shell (1) into the impact area (2) and the pouring area (7), the baffle wall (4) and the inner wall (19) of the impact area (2) are integrally cast components, support rods (9) are arranged between the baffle wall (4) and the inner wall of the shell (1), the baffle wall (4) is provided with the flow guide hole (16) for guiding the molten steel to flow from the impact area (2) to the pouring area (7), the impact area (2) is provided with the flow stabilizer (3), the pouring area (7) is provided with three tapping holes, dams are arranged between the tapping holes, and the dams are provided with the pouring hole (18).

2. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 1, characterized in that: The flow guide hole (16) is arranged in an upward inclination.

3. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 2, characterized in that: The upward inclination angle of the flow guide hole (16) is 15 degrees.

4. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 1 or 2, characterized in that: The baffle wall (4) is provided with a slag discharge groove (14).

5. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 4, characterized in that: The slag discharge groove (14) is located at the upper portion of the baffle wall (4), and the flow guide hole (16) is located at the lower portion of the baffle wall (4).

6. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 1, characterized in that: The shell (1) is in a T-shaped structure.

7. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 1, characterized in that: The baffle wall (4) is provided with two support grooves (17), one end of the two support rods (9) is mounted on the inner wall of the tundish, and the other end is mounted on the support grooves (17), and the two support rods (9) are arranged in horizontal parallelism.

8. A three-strand slab continuous casting tundish for reducing the amount of slag according to claim 1, characterized in that: The upper portion of the shell (1) is provided with an overflow groove (20).

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