System device for adding rare earth into continuous casting tundish and adding method

Abstract

The invention relates to a system device for adding rare earth into a continuous casting tundish and an adding method, belonging to the field of ferrous metallurgy. In the invention, a powder spraying tube is arranged between a tundish and a powder spraying pot, one end of the powder spraying tube is connected with a powder spraying pot, the other end is arranged at the slit of a slit-type air brick arranged at the lower part of the tundish, and argon is adopted to spray rare earth powder to the slit of the air brick by the powder spraying tube and then enters the tundish. In the invention, high-pressure powder airflow is utilized to intensively stir molten steel, thus shortening alloying time, greatly improving dynamical condition of metallurgy reaction, promoting homogenized degree of rare earth elements in steel, improving yield of alloy, having strong reproducibility and accurate sprayed elements, and controlling the components of smelt steel within a narrow range. The invention also solves the problem of environmental pollution, and has the advantages of saved investment, portable equipment, easy operation and the like.

Description

Continuous casting tundish rare earth adding system device and adding method technical field The invention relates to a continuous casting tundish rare earth adding system device and adding method, belonging to the field of iron and steel metallurgy. Background technique The molten steel that has been refined outside the furnace is required not to be re-polluted during the continuous casting process. During the flow of the molten steel in the tundish, inclusions should be promoted to float up to further purify the molten steel. For this reason, the tundish adopts a heating device, air blowing, and wire feeding. And other functions constitute the tundish metallurgical technology. Tundish metallurgical technology is the key to improving the cleanliness of continuous casting slabs and ensuring excellent quality of slabs. With the development of continuous casting technology, the research on tundish metallurgy technology has become a key research topic for metallurgists. At...

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Problems solved by technology

The above addition methods have problems such as low yield of rare earth and other elements distributed in the steel, poor uniformity, long processing cycle, and difficulty in site layout of feeding equipment, which affects site operation.

Due to their special properties, rare earth elements are often used to feed rare earth wires into the steel in the crystallizer. If the rare earth wire diameter and wire feeding speed are well controlled, the uniformity of rare earth distribution in the billet can be improved, but because the rare earth stays in the steel The time is short, and it is difficult to remove the rare earth inclusions generated. In addition, the rare earth oxidation products generated enter the molten layer of mold slag, which changes the melting performance of the mold slag, makes the lubrication and heat transfer function of the mold slag unable to fully play, and causes the slab quality deterioration

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