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

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...

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

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