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Study on the Large Inclusions in 321 Stainless Steels

Jingjie Li

Abstract

The types and the amount of the large inclusions in 321 stainless steel during steelmaking and casting process were investigated. The effect of Ar stirring on the amount of large inclusions were discussed. The results showed that there existed several type large inclusions including such inclusions as CaO-SiO_(2)-(Al_2O_3), CaO-MgO-SiO_(2), SiO_(2) in liquid prior to adding Ti wire to the molten steel. After feeding Ti wire to the liquid, a part of the large inclusions became those containing TiO_(2) because of reduction of SiO_(2 )in the large inclusions by \. Soft Ar stirring was employed not only to avoid reoxidation but also to make some large inclusions float out of the molten steel.

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Key concepts: Steelmaking, Metallurgy, Materials science, Liquid steel, Continuous casting, Non-metallic inclusions, Inclusion (mineral), Deoxidization