Diseño de polvos de molde para colada continua de slabs de aceros bajo carbono
Keywords:Fluxes, continuous casting, minerals, nepheline, cuspidine
Commercial fluxes were characterized by laboratory tests, and their original properties were changed with additions of chemical reagents in order to establish criteria and design strategies to produce new fluxes. The characterization of the commercial fluxes reveals that they are produced by simple mechanical blend of minerals, using feldspars and clays as base materials, containing SiO2, Al2O3, Na2 O and in less quantity K2O, MgO, Fe2 O3and MnO; limestone as the main source of CaO, fluorspar (CaF2) used to control the viscosity and graphite as carbon source. Melting-solidification tests revealed melting and fluidity temperatures and the existence of abundant mineralogical phases formed during the flux solidification. Some important mineralogical compounds are the nepheline (NaAlSiO4) and cuspidine (Ca4Si2O7F2); these species have a direct influence on the heat transfer phenomena from strand to mold and therefore on the phase transformations and the shrinkage of the steel.
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