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Kölbl, Nathalie
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article
Main wear mechanisms of SEN slag band materials
Abstract
This paper summarizes experimental approaches and simulation results in order to establish a general proposition regarding SEN wear mechanisms. Marangoni convection is considered to be a major contribution to continuous SEN wear, usually causing characteristic corrosion grooves. It is governed by the interface tension gradient in the vicinity of the three phase boundary slag/refractory/steel. This interface tension gradient is caused by a lower activity of the oxygen dissolved in the steel close to the refractory/steel interface. This is due to the reducing action of the solid carbon, which is acomponent of the refractory. By a simulation model using the Effective Equilibrium Reaction Zone technique a calculation of the interface tension difference Δσ was performed. While for an LC steel and the related slag a value Δσ = 150 mN/m was received, this quantity is negligible in the case of a TRIP steel. Accordingly, also the wear is much less for the TRIP steel. Marangoni convection is decisive for the mass transfer at the refractory/slag interface. Here dissolution of zirconio, but also oxidation of carbon takes place. For the latter one, the above mentioned simulation showed that reduction of silica in the mold slag takes place at the three phase boundary slag/refractory/steel by solid carbon, as the activity of silicon is reduced by dissolution in the liquid steel. This is the main source of oxygen for carbon oxidation at the three phase boundary. Therefore the three phase boundary is the focus of SEN wear; It unites intense bath movement due to Marangoni convection, oxidation of carbon by SiO2 reduction and zirconia erosion and dissolution into the melt. Within the refractory itself, a thin layer of several millimetres shows reactions with slagcomponents. This causes especially destabilisation of stabilised zirconia and prepares later erosive wear. Steel does not penetrate into the SEN microstructure, carbon dissolution is only possible at the steel/refractory interface. The results quoted here enable justified expectations about the SEN wear in dependence on the steel/slag grade. Further simulation offers the possibility to quantify the effect of parameter variations on SEN wear.