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Study on Inclusions in Ti Stabilized Stainless Steel during Steelmaking and Casting

Zheng Hongguang

Abstract

The types and evolution of the inclusions in Ti stabilized (321) stainless steel during steelmaking and casting were investigated. The effect of Al, Ca and Ti as well as reoxidization on the inclusions was analyzed. The results showed that there are two kinds of inclusions, namely, CaO·TiO2-MgO·Al2O3 as dual-phase inclusion and TiN. After Ti wire feeding SiO2 in, CaO-SiO2 and CaO-SiO2-Al2O3 is reduced by Ti, and CaO·TiO2-MgO·Al2O3 is formed. CaO·TiO2-MgO·Al2O3 inclusions can be reduced sharply either by Ar soft stirring after adding Ca-Si alloy or deoxidation without Al and Ca-Si alloy. The formation of CaO·TiO2-MgO·Al2O3 inclusions can be prevented by avoiding reoxidization of molten steel. The amount of TiN containing MgO·Al2O3 core can be decreased by lowering Al in liquid steel. A few of TiN can be oxidized to TiOx when the molten steel is reoxidized during casting.

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Key concepts: Materials science, Steelmaking, Tin, Metallurgy, Alloy, Casting, Continuous casting, Inclusion (mineral)