Application of Oxide Coatings for Improved Steel Filtration with the Aid of a Metal Casting Simulator

Abstract

Slip casted, carbon bonded nozzles with active mullite coating have been simultaneously tested with uncoated nozzles in a steel casting simulator according to their clogging behavior against endogenous as well as exogenous non-metallic inclusions. After the tests with inclusions containing steel melt no clogging of particles could be observed on the active mullite coating after steel melt contact. The investigations show a position-dependent partially till completely decomposition of the mullite coating into coarse grained alumina-rich particles and a second phase with a main composition in the ternary system MnO-SiO 2 -Al 2 O 3 . It has been verified that these decomposition was caused by multiple reactions between the mullite coating and the substrate during heat-up as well as interactions between the coating and alloying elements of the steel melt during the tests.

Influence of the Chemistry of Surface Functionalized Ceramic Foam Filters on the Filtration of Alumina Inclusions in Steel Melts

“…This leads to the assumption that the chemistry of the filter material exhibits a major role toward the filtration of inclusions, consisting of the same chemistry. In contrast to Dudczig et al, [19] neither contact between mullite and carbon, nor contact between mullite and steel melt lead to the decomposition of mullite in case of filter application. Due to carbon pickup by steel melt, the alumina content is expected to increase slightly, especially on the filter surface, although the carbon pickup is estimated to be very low, according to Khanna et al [18] Table 6 presents the amount of trapped exogenous alumina, as well as A-M-S based inclusions by the active mullite coated filter.…”

Corrosion of Carbon Free and Bonded Refractories for Application in Steel Ingot Casting

“…The corrosion experiments were conducted in an application‐near setup as described by Fruhstorfer et al in an inductively heated melting unit of a metal casting simulator (Systec GmbH, Germany) introduced by Dudczig et al under argon atmosphere. The crucibles were filled with 20–25 kg of the steel 18CrNiMo7‐6 as recommended .…”

Numerical Modeling of Flow Conditions during Steel Filtration Experiments

“…The CFF is immersed in the melt inside the induction crucible furnace (ICF) of this steel casting simulator in order to estimate the filtration efficiency. [3][4][5] An ICF is widely used in steelmaking industry to heat up the metal and to enhance the mixing of the melt. The flow inside the ICF is generated in the following way.…”