Method of cleaning molten steel with multi-foam screen of continuously casted tundish

A continuous casting tundish and clean steel technology, which is applied to casting equipment, casting molten material containers, manufacturing tools, etc., can solve the problems of low non-metallic inclusion removal rate, failure to meet production requirements, limited size and distribution, etc., to achieve Avoid the problem of molten steel cooling and slag entrainment, avoid the problem of easy adsorption saturation and failure, and the effect of long-term removal

Inactive Publication Date: 2012-08-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially the tundish air curtain retaining wall technology can remove tiny inclusions below 50 μm in molten steel through small bubbles, but it is limited to the size and distribution of bubbles, and the removal rate of small non-metallic inclusions smaller than 50 μm is still low and the stability is not enough , still cannot meet the production requirements of high-quality steel such as thin DI tanks and engine valve spring steel; at the same time, although this technology can partially replace the slag retaining weir and slag retaining dam, and reduce the secondary pollution of molten steel caused by refractory damage, it is At the expense of purification effect

Method used

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  • Method of cleaning molten steel with multi-foam screen of continuously casted tundish
  • Method of cleaning molten steel with multi-foam screen of continuously casted tundish

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Effect test

Embodiment 1

[0017] The invention discloses a method for cleaning molten steel with multiple air bubble curtains in a continuous casting tundish. like figure 1 As shown, two breathable bricks 4 are arranged on the bottom 5 of the tundish 2, and the distance between the breathable bricks 4 is 300-500mm. The center distance between the air brick 4 and the water outlet 3 is 500-600mm.

[0018] Before the tundish 2 is poured, argon gas is introduced through the breathable brick 4, the flow rate of the argon blowing is 5~8Nl / min, and the pressure is 0.02~

[0019] 0.03MPa; when the tundish 2 is poured, adjust the argon blowing flow rate to 7~15Nl / min, and the pressure to 0.08~0.11MPa.

Embodiment 2

[0022] The invention discloses a method for cleaning molten steel with multiple air bubble curtains in a continuous casting tundish. like figure 1 As shown, three air-permeable bricks 4 are arranged on the bottom 5 of the tundish 2, and the distance between the air-permeable bricks 4 is 100-300mm. The center-to-center distance between the air-permeable brick 4 and the water outlet 3 is 400-500 mm.

[0023] Before the tundish 2 is poured, argon gas is introduced through the air-permeable brick 4, the argon blowing flow rate is 6~9Nl / min, and the pressure is 0.03~0.04MPa; min, the pressure is 0.10~0.13MPa.

[0024] Among the three air permeable bricks 4 described in this embodiment, two are inclined surface type and one is plane type; one of them is diffuse type air permeable brick, and two are combined type air permeable bricks.

Embodiment 3

[0026] The invention discloses a method for cleaning molten steel with multiple air bubble curtains in a continuous casting tundish. like figure 1 As shown, four air-permeable bricks 4 are arranged on the bottom 5 of the tundish 2, and the distance between the air-permeable bricks 4 is 50-100mm. The center distance between the air brick 4 and the water outlet 3 is 300-400mm.

[0027] Before the tundish 2 is poured, argon gas is introduced through the breathable brick 4, the flow rate of the argon blowing is 7~10Nl / min, and the pressure is 0.04~

[0028] 0.05MPa; when the tundish 2 is poured, adjust the argon blowing flow rate to 13~20Nl / min, and the pressure to 0.12~0.15MPa.

[0029] Among the 4 breathable bricks 4 described in this embodiment, 2 are inclined surface type and 2 are flat type; 1 of them is diffuse type breathable brick, 1 is straight-through hole type breathable brick, and 2 are combined type breathable bricks .

[0030]In this specific embodiment, on the ...

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Abstract

The invention relates to a method of cleaning molten steel with a multi-foam screen of a continuously casted tundish. The method adopts the technical scheme that 2-4 permeable bricks (4) are arranged between an water inlet (1) and a water outlet (3) at the bottom (5) of the tundish (2), the distance between the permeable bricks (4) is 50-500mm, and the distance from the center of the permeable brick (4) adjacent to the water outlet to the center of the water outlet (3) is 300 to 600mm; before the tundish is cast, argon is introduced to the permeable bricks (4), the flow quantity of argon is 5-10Nl/min, and the pressure is 0.02-0.05MPa; during the tundish casting, the flow quantity of argon is 7-20Nl/min, and the pressure is 0.08-0.15MPa; and the permeable bricks (4) are inclined or plane, and the permeable bricks (4) can be a diffusion type permeable bricks, permeable bricks with through holes, or combination type permeable bricks. The method provided by the invention has the characteristics that the investment is low, the method is simple to operate, and the method can efficiently eliminate foreign gases and a large amount of small non-metal inclusions. Moreover, the method can efficiently reduce the consumption of fireproof materials and pollution, produce no rolling slags in the smelting process, and make the temperature uniform and stable.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting. In particular, it relates to a method for cleaning molten steel with multiple air bubble curtains in a continuous casting tundish. Background technique [0002] In recent years, with the progress of society and the development of science and technology, modern defense, transportation, energy and other industries have higher and higher requirements for steel performance. In order to meet this requirement, the research on clean steel technology has become an important research in the field of iron and steel metallurgy technology. topic. Improving the cleanliness of molten steel is the basis for improving steel quality. The removal of impurities such as [O], [H], [N] and non-metallic inclusions in steel that have a greater negative impact on steel performance has become a steelmaking process. An important link in the production of high-quality steel grades. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D41/02
Inventor 黄奥顾华志张美杰
Owner WUHAN UNIV OF SCI & TECH
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