Slab continuous casting tundish

Abstract

The utility model relates to a slab continuous casting tundish, and belongs to the technical field of continuous casting production equipment in the metallurgical industry. According to the technical scheme, the tundish is formed by building refractory materials, the bottom of the tundish comprises three layers of steps from low to high, namely a first-stage step (7), a second-stage step (11) and a third-stage step (12), and a steel tapping hole of the tundish is located in the first-stage step (7); the second step (11) is provided with a sliding retaining wall (3), a retaining dam A (9) and a retaining dam B (8), the sliding retaining wall (3) is connected to the wall of the tundish in an up-down sliding mode, and the retaining dam A (9) and the retaining dam B (8) are fixed to the bottom of the tundish respectively; the third step (12) is provided with a current stabilizer (13); the dam B (8) is close to the first step (7), and the sliding retaining wall (3) is located between the flow stabilizer (13) and the dam A (9). The device has the beneficial effects that the device can adapt to the pouring process of tundish molten steel with different liquid levels, and the slag of the tundish is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a plate blank continuous casting tundish belongs to metallurgical industry continuous casting production equipment technical field. BACKGROUND

[0002] Continuous casting tundish is the last container before the liquid steel solidification, in order to make continuous casting tundish play its function of purifying liquid steel, preventing secondary pollution of liquid steel and uniform temperature composition, metallurgical enterprise has put forward very high requirement to continuous casting tundish. Metallurgical technology of continuous casting tundish has caused enough attention of metallurgical workers. At present, the technical means applied to tundish metallurgy mainly have: (1) tundish structure optimization, such as using large capacity high depth large tundish or using retaining wall, dam, turbulence controller to control the flow of molten steel;(2) using anti-vortex technology combined with ladle-tundish's under-slag detection to reduce the under-slag of tundish into crystallizer;(3) using gas protection method, using inert gas as the protective gas of continuous casting tundish, forming a soft connection sealed chamber to avoid the secondary oxidation of injection flow and molten steel liquid level.

[0003] Although there are more research and results for the optimization of continuous casting tundish structure and matching function, but these researches mainly concentrate in steady casting process. With the progress of production level, the quality problem under stable production state is not outstanding. In continuous casting production, non-steady production process is inevitable, such as continuous casting mixed casting production process of different steel grades. In order to reduce the waste of mixed casting billet, low tundish liquid level and low flow mode are used for operation in a short time. In the non-steady production process of continuous casting tundish, problems such as tundish under-slag, tundish protection slag denaturation and molten steel secondary oxidation are faced, and these problems have not been paid attention to in the current tundish structure design. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a plate blank continuous casting tundish, which can adapt to the molten steel casting process of tundish with different liquid level height, effectively reduce the under-slag of tundish and solve the problems in the background technology.

[0005] The technical scheme of the utility model is:

[0006] A plate blank continuous casting tundish, comprising a sliding retaining wall, a first step, a dam B, a dam A, a second step, a third step and a flow stabilizer, the tundish is built by refractory material, the tundish bottom comprises three steps from low to high: the first step, the second step and the third step, and the tundish tapping hole is located at the first step;The second step is provided with the sliding retaining wall, the dam A and the dam B, the sliding retaining wall is connected to the tundish wall by sliding up and down, and the dam A and the dam B are fixed on the tundish bottom respectively;The third step is provided with the flow stabilizer.

[0007] The dam B is close to the first step, and the sliding dam is located between the flow stabilizer and the dam A.

[0008] The sliding dam, the dam A and the dam B are all provided with the communication holes.

[0009] The middle part of the sliding dam is provided with a slag line erosion resistant coating.

[0010] The middle tundish wall is provided with a groove which is slidingly connected with the sliding dam.

[0011] The groove on the middle tundish wall which is slidingly connected with the sliding dam is vertical.

[0012] The beneficial effect of the utility model is: can effectively prevent the middle tundish under the low liquid level pouring state, its steel side's big ladle down slag flows to the side of tapping, reduces the vortex roll slag under the low liquid level pouring state, simultaneously avoids the remaining steel phenomenon of the middle tundish each area under the low liquid level pouring state and the erosion phenomenon of the steel slag to the middle tundish. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is the section structure diagram of the utility model;

[0014] Fig. 2 It is the sliding dam structure diagram;

[0015] In the drawing: big ladle sleeve 1, groove 2, sliding dam 3, slag line erosion resistant coating 4, stopper 5, stopper sleeve 6, first step 7, dam B 8, dam A 9, communication hole 10, second step 11, third step 12, flow stabilizer 13. DETAILED DESCRIPTION

[0016] The utility model is further explained by examples in combination with the drawings.

[0017] Refer to the drawings Figs. 1-2 A slab continuous casting tundish, including sliding dam 3, first step 7, dam B 8, dam A 9, second step 11, third step 12 and flow stabilizer 13, the tundish is built by refractory material, and the tundish bottom includes three steps from low to high: first step 7, second step 11 and third step 12, and the tundish tapping hole is located at the first step 7;Second step 11 is provided with sliding dam 3, dam A 9 and dam B 8, and the sliding dam 3 is slidingly connected on the tundish wall, and dam A 9 and dam B 8 are fixed on the tundish bottom respectively;Third step 12 is provided with flow stabilizer 13.

[0018] In the embodiment, refer to the drawings Figs. 1-2The slab continuous casting tundish is built by refractory material and a three-step platform is formed on the bottom of the tundish. The tundish tapping hole is located on the lowest first step 7, and the height of the tapping hole is 350mm to 450mm. A stopper 5 is arranged on the first step 7, and a stopper sleeve 6 is arranged on the stopper 5. The material of the stopper sleeve 6 is ZrO2-C, and the height of the stopper sleeve 6 is not less than 600mm. A groove 2, a sliding dam wall 3, a dam A 9 and a dam B 8 are arranged on the second step 11. The material of the sliding dam wall 3 is Al2O3-C, and a ZrO2-C slag line erosion resistant coating 4 is arranged in the middle of the sliding dam wall 3. The groove 2 is arranged vertically on the wall of the tundish. The sliding dam wall 3 can move up and down in the groove 2 under the action of the molten steel floating force. The lower part of the sliding dam wall 3, the dam A 9 and the dam B 8 are provided with a communication hole 10. A flow stabilizer 13 is arranged on the third step 12, and the flow stabilizer 13 corresponds to a ladle sleeve 1.

[0019] Referring to the drawings Fig. 1 When the remaining steel amount of the tundish is low, the molten steel is concentrated in the first step 7 area, and the certain height can avoid vortex formation and prevent the tundish from being slagged. In addition, the stopper sleeve 6 with a certain length can prevent the erosion of the stopper under the tundish low liquid level pouring.

[0020] Referring to the drawings Figs. 1-2 The sliding dam wall 3 arranged on the second step 11 can move up and down in the groove 2. Under the action of the molten steel floating force, the sliding dam wall 3 moves with the liquid level when the tundish is at different liquid levels, which can effectively prevent the slag layer on the molten steel surface on one side of the ladle sleeve from flowing to the tundish tapping hole side. At the same time, the slag line erosion resistant coating 4 in the middle of the sliding dam wall 3 can effectively reduce the erosion of the tundish slag on the refractory material. When the liquid level is lower than the sliding dam wall 3 and the dam B 8 and the dam A 9, the molten steel can flow out from the lower communication hole 10.

Claims

1. A slab continuous casting tundish, characterized by: The tundish comprises a sliding retaining wall (3), a first step (7), a retaining dam B (8), a retaining dam A (9), a second step (11), a third step (12) and a flow stabilizer (13), the tundish is built by refractory material, the tundish bottom comprises three steps from low to high: the first step (7), the second step (11) and the third step (12), the tundish tapping hole is located at the first step (7); the second step (11) is provided with the sliding retaining wall (3), the retaining dam A (9) and the retaining dam B (8), the sliding retaining wall (3) is connected to the tundish wall in a sliding mode, the retaining dam A (9) and the retaining dam B (8) are fixed on the tundish bottom respectively; the third step (12) is provided with the flow stabilizer (13).

2. A slab continuous casting tundish according to claim 1, characterized in that: The retaining dam B (8) is close to the first step (7), the sliding retaining wall (3) is located between the flow stabilizer (13) and the retaining dam A (9).

3. A slab continuous casting tundish according to claim 1 or 2, characterized in that: The sliding retaining wall (3), the retaining dam A (9) and the retaining dam B (8) are all provided with a communication hole (10).

4. A slab continuous casting tundish according to claim 1 or 2, characterized in that: The sliding retaining wall (3) is provided with a slag line erosion resistant coating (4) in the middle.

5. A slab continuous casting tundish according to claim 1, characterized in that: The tundish wall is provided with a groove (2) for sliding connection with the sliding retaining wall (3).

6. A slab continuous casting tundish according to claim 5, characterized in that: The groove (2) for sliding connection with the sliding retaining wall (3) on the tundish wall is vertical.

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