Method for refining and quickly slagging low-carbon low-silicon aluminum-containing killed steel

Abstract

The invention discloses a method for refining and rapidly slagging low-carbon low-silicon aluminum-containing killed steel, and belongs to the technical field of alloy steel. The method comprises the following steps: adding the refining synthetic slag accounting for 28-35% of the total amount of a converter and lime slag accounting for 28-35% of the total amount of the converter in the tapping process of the converter; adding the residual refining synthetic slag and lime slag in the refining process; the total amount ratio of the refining synthetic slag to the lime slag is 1: (5-7); the refining synthetic slag is prepared from the following components in percentage by weight: 20-50% of metal aluminum, 35-60% of Al2O3 and 10-20% of CaO, and the granularity of the metal aluminum is less than 5 mm. According to the method, white slag operation is achieved within 15 minutes in the refining process, the generated white slag has sufficient time for desulfuration and inclusion removal in the later stage of refining, and meanwhile cost can be reduced and efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and relates to a production process of low-carbon, low-silicon, aluminum-containing killed steel; in particular, it relates to a method for rapidly forming slagging in the refining of low-carbon, low-silicon, aluminum-containing killed steel. Background technique [0002] As users have higher and higher requirements for steel quality, extra-furnace refining has developed rapidly as a means to improve steel quality. In the process of refining outside the furnace, the purpose of desulfurization, deoxidation and even denitrification can be achieved through reasonable slagging; it can absorb inclusions in steel; it can control the shape of inclusions; it can form foamy slag to submerge the arc to improve thermal efficiency and reduce refractory materials erosion. Therefore, special attention should be paid to slagging in the refining process outside the furnace. [0003] Rapid white slag produc...

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Problems solved by technology

However, the amount of material added in the tapping process needs to be appropriate. Adding too much lime is easy to form lumps, which not only affects the effect of slag melting, but also makes it impossible for the fed aluminum wire to enter the molten steel, which greatly reduces the recovery rate of aluminum. Too much will easily cause slag thinning effect and affect the removal effect of large inclusions; too little added material in the tapping process will not be able to slag in time, delaying the refining slag time

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