Influence of specific trace elements on the wetting behaviour of a medium-carbon steel in contact with different oxidic substrates

Interfacial properties affect metallurgical processes in various ways. The wetting behaviour of steel melts influences, for example, refining, removal of non-metallic inclusions, and casting. Most solved elements are supposed to lower the surface tension as well as the wetting angle between liquid steel and oxides like $Al_{2}O_{3}$ and $ZrO_{2}$. While these phenomena are well observed of the 16$^{th}$ group of the periodic table, others remain largely unresearched. With increasing scrap rates in steel production, the amount of trace and tramp elements like copper, tin, or molybdenum is predicted to increase. In this work the effects of these elements on the wetting behaviour of steel melts are studied by means of drop shape analysis. This method enables the measurement of the wetting angle of liquid steel on various oxidic substrates. Furthermore, possible reaction layers are examined by metallographic means and SEM/EDS. Thermodynamic calculations using FactSage are additionally applied.

Abstract

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