Deoxidation of Molten Steel with Deoxidizer Containing Aluminum

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Abstract
The mechanism on the deoxidation of molten steel with deoxidizer containing aluminum was investigated by using induction furnace. The results obtained are summarized as follows. 1. Shape of deoxidation products in molten steel is cluster after addition of Al-Mg-Si or aluminum, and is globular after addition of Al-Ca-Si-Mn. 2. Though cluster type deoxidation products appear to consist of isolated particles on a polished cross section, they are in dendritic structure in the three dimensional configulation. 3. Deoxidation products after addition of Al-Mg-Si or aluminum have a big size as clusters and float up in molten steel very rapidly. But deoxidation products after addition of Al-Ca-Si-Mn have a small size as isolated globular products. Consequently, the decreasing rate of total oxygen in molten steel is much faster with the addition of Al-Mg-Si or aluminum than with that of Al-Ca-Si-Mn.