Steel-ladle diffusion ring gas-permeable upper nozzle seat brick and argon blowing metallurgy method thereof

Abstract

The invention relates to a steel-ladle gas-permeable upper nozzle seat brick. The steel-ladle gas-permeable upper nozzle seat brick comprises an upper nozzle seat brick body, a diffusion type gas-permeable ring, a gas chamber box and a gas inlet pipe, wherein a steel flowing hole, a connecting hole and an upper nozzle installing hole which vertically penetrate are formed in the middle of the steel-ladle upper nozzle seat brick body. In the continuous-casting steel-ladle pouring process, argon is blown in the whole process, and the flow rate of argon is automatically adjusted according to changes of net weight of molten steel in a steel ladle; the argon permeates through the diffusion type gas-permeable ring to form tiny argon bubbles, most of the argon bubbles move upwards to form an annular gas curtain barrier around the steel-ladle upper nozzle, and the molten steel to be fed into the steel-ladle upper nozzle is subjected to gas washing; and a stable and continuous annular gas flow is formed in the upper nozzle for preventing nodulation of the upper nozzle, and at the later stage of the steel ladle pouring, the steel-ladle lower slag caused by a conflux vortex and a discharge pitcan be effectively inhibited. By means of the steel-ladle gas-permeable upper nozzle seat brick, compared with the prior art, the pouring margin of the molten steel in the steel ladle can be reducedby 36% or above, and the weight of electrolytic inclusions of a continuous casting blank sample is reduced by 35% or above.

Description

technical field [0001] The invention relates to a ladle diffusion ring breathable upper nozzle seat brick and an argon-blowing metallurgical method, belonging to the technical field of steelmaking process in iron and steel metallurgy. Background technique [0002] The cleanliness and castability of molten steel are the focus and difficulty of steelmaking process control. In continuous casting production, after the slag in the ladle flows into the tundish, it will cause the burning loss of easily oxidized alloy elements such as aluminum and titanium in the molten steel. , and produce alumina inclusions, affecting the cleanliness of molten steel, and easily causing steel surface quality problems. Generally, the ladle slag detection technology is used to reduce the amount of ladle slag, that is, the nozzle is closed and the pouring is stopped when the ladle slag is detected at the later stage of ladle pouring. However, the following problems are found in the actual production p...

AI Technical Summary

Problems solved by technology

[0002] The cleanliness and castability of molten steel are the focus and difficulty of steelmaking process control. In continuous casting production, after the slag in the ladle flows into the tundish, it will cause the burning loss of easily oxidized alloy elements such as aluminum and titanium in the molten steel. , and produce alumina inclusions, affecting the cleanliness of molten steel, and easily causing steel surface quality problems

Generally, the ladle slag detection technology is used to reduce the amount of ladle slag, that is, the nozzle is closed and the pouring is stopped when the ladle slag is detected at the later stage of ladle pouring. However, the following problems are found in the actual production process: (1) The remaining amount of molten steel pouring in the ladle (2) Although it can reduce the amount of slag in the ladle to a certain extent, it does not have the metallurgical function of removing inclusions in molten steel and purifying molten steel

This patent has the following deficiencies: there is no air-permeable element in the nozzle seat brick, there is no function of removing inclusions and purifying molten steel, and it cannot suppress the problem of slag rolling at the nozzle of the molten steel tank, and there is a large amount of molten steel pouring

This patent has the following disadvantages: the argon bubbles formed by argon passing through the permeable pottery are large and dense, and argon is only blown in at the end of ladle pouring, and there is no metallurgical function of blowing argon to remove inclusions throughout the process

This patent has the following disadvantages: the number of vent plugs is set to 2 or 4, and a continuous and dense annular air curtain barrier of argon bubbles cannot be formed around the upper nozzle of the ladle. Inert gas, without the metallurgical function of blowing argon all the way and promoting the floating and removal of inclusions; under the condition that the molten steel level in the ladle continues to decrease, the flow rate of argon blowing is not automatically adjusted linearly, resulting in molten steel slag caused by blowing the slag surface question

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