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Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method

A technology of argon blowing refining and slab continuous casting, which is applied in the iron and steel metallurgical continuous casting tundish field, which can solve the problems of limited gas blowing volume, high manufacturing cost, and no adjustment of argon flow rate for ventilated bricks.

Active Publication Date: 2017-03-22
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing continuous casting tundish air curtain retaining wall technology can remove the inclusions in the molten steel to a certain extent and serve the purpose of purifying the molten steel, but there are still the following technical defects: the air blowing volume of the breathable brick is limited, and the slag cannot be blown away Large air blowing volume is easy to blow open the steel slag surface, resulting in secondary oxidation of molten steel slag and molten steel. The argon bubbles formed by the air curtain retaining wall have limited ability to capture and remove inclusions, which cannot meet the control requirements of high-purity clean steel for inclusions.
But this invention has the following deficiencies: 1) the dipping hood has complex structure and high manufacturing cost, which increases the production cost of continuous casting; Reacts with alkaline slag in the tundish, not resistant to corrosion, and pollutes molten steel
[0005] The above patented technology forms a continuous and tight bubble column between the strip-shaped breathable brick and the impregnation cover, which improves the ability of argon bubbles to capture and remove inclusions, but there are the following shortcomings in production practice: 1) The strip-shaped breathable brick does not have a barrier The combined use of walls and retaining dams makes the time for the inclusions in the molten steel in the tundish to float insufficient, which affects the removal rate of inclusions; 2) The structure of the dipping cover is complicated and the manufacturing cost is high, which increases the production cost of continuous casting; 3) The lower end of the dipping hood is immersed in the molten steel to a small depth, which is prone to the problem of slag entrainment in the dipping hood; 4) The argon blowing flow rate of the strip-shaped breathable brick is controlled by manual adjustment, and it is not timely according to the change of the liquid level of the tundish (net weight of molten steel in the tundish) Adjust the flow rate of argon gas, resulting in the technical problem of molten steel slag rolling due to the untimely adjustment of the flow rate of argon blowing under the conditions of low liquid level in the tundish such as ladle opening, ladle change, and stop pouring

Method used

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  • Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method
  • Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method
  • Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A refining device for slab continuous casting tundish strip-shaped breathable bricks with cover and argon blowing, the structure is as follows Figure 1-Figure 10 As shown, it includes turbulence controller 1, dipping cover 2, strip-shaped breathable brick 3, retaining wall 4, inclined hole dam 5, turbulence controller is installed on the inner side of the working lining of the tundish injection impact zone, and its longitudinal center Line coincides with the center line of the long nozzle 12 of the large bag, and the bottom ends of the strip-shaped breathable brick 3 and the inclined hole dam 5 are fixed on the permanent lining 7 at the bottom of the tundish, and are partially embedded in the working lining 6 at the bottom of the tundish , the dipping cover 2 is located directly above the strip-shaped breathable brick 3 and opposite to the strip-shaped breathable brick 3, the longitudinal centerline of the dipping cover 2 coincides with the longitudinal centerline of th...

Embodiment 2

[0089] As described in Example 1, the refinement device and argon blowing control method for strip-shaped breathable bricks with a cover in the slab continuous casting tundish and the argon blowing control method are different in that:

[0090] The inclined hole inclination angle β on the inclined hole retaining dam 5 is 35°, the vertical distance x from the lower edge of the inclined hole to the working surface of the tundish bottom working lining 6 is 30mm, and the horizontal distance between the retaining wall 4 and the inclined hole retaining dam 5 a is 250mm.

[0091] The inner arc radius r of the arc structure of the dipping cover 2 is 250 mm, the arc height i is 150 mm, and the thickness f is 150 mm.

[0092] The depth v below the normal pouring liquid level 8 of the molten steel in the tundish for the lower end of the dipping cover 2 is 100mm.

[0093] The distance j from the upper end of the dipping cover 2 to the lower end of the tundish cover 13 is 100mm.

[0094]...

Embodiment 3

[0107] As described in Example 1, the refinement device and argon blowing control method for strip-shaped breathable bricks with a cover in the slab continuous casting tundish and the argon blowing control method are different in that:

[0108] The inclined hole inclination angle β on the inclined hole retaining dam 5 is 32°, the vertical distance x from the lower edge of the inclined hole to the working surface of the tundish bottom working lining 6 is 27mm, and the horizontal distance between the retaining wall 4 and the inclined hole retaining dam 5 a is 270mm.

[0109] The inner arc radius r of the arc structure of the dipping cover 2 is 270 mm, the arc height i is 200 mm, and the thickness f is 130 mm.

[0110] The depth v below the normal pouring level 8 of molten steel in the tundish when the lower end of the dipping cover 2 is immersed is 120 mm.

[0111] The distance j from the upper end of the dipping cover 2 to the lower end of the tundish cover 13 is 80 mm.

[01...

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Abstract

The invention relates to a covered argon blowing refining device for a slab continuous casting tundish strip-shaped air brick and an argon control method. The device comprises a turbulent controller (1), a dipping cover (2), the strip-shaped air brick (3), a retainer wall (4) and an inclined hole stop dam (5); the dipping cover (2) is positioned rightly above the strip-shaped air brick (3); the lower end of the dipping cover (2) is dipped below a lowest pouring liquid level (9) of molten steel in a continuous-cast ladle exchange process tundish; an argon blowing control system PLC is adopted to collect and upload a pressure value of a first pressure gauge (22a), a flow value of a special metallurgy mass-flow controller (25) and a pressure value of a second pressure gauge (22b) into a continuous casting foundation automatic system database through ethernet communication; an argon flow automatic control instruction of the argon blowing control system PLC is performed; and the argon flow is automatically adjusted according to the net weight change of the molten steel in the tundish, so that the precise control is realized, and the effect of the tundish removing inclusions in the molten steel is improved.

Description

technical field [0001] The invention relates to a strip-shaped air-permeable brick-covered argon-blowing refining device for a slab continuous casting tundish and an argon gas control method, belonging to the technical field of iron and steel metallurgy continuous casting tundish. Background technique [0002] The existing continuous casting tundish air curtain retaining wall technology can remove the inclusions in the molten steel to a certain extent and serve the purpose of purifying the molten steel, but there are still the following technical defects: the air blowing volume of the breathable brick is limited, and the slag cannot be blown away On the surface, the large amount of air blowing is easy to blow open the steel slag surface, resulting in secondary oxidation of molten steel slag and molten steel. The argon bubbles formed by the air curtain retaining wall have limited ability to capture and remove inclusions, which cannot meet the control requirements of high-purit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117
CPCB22D11/117
Inventor 武光君郭伟达王中学张学民
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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