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Mould fluxes compositions contain acid oxides such as SiO 2 and basic oxides such as CaO and MgO. The amorphous phase of molten mould flux generates a high viscosity material. Carbon is also added in the mould flux composition and, if in an adequate amount and type, it actuates on melting rate and on the control of sintering tendency, insulation properties and slag rim formation. Carbon particles act as a barrier between the raw materials grains keeping them separated. The higher is the carbon content, the lower is the melting rate. The mould flux melting control is very important to guarantee enough liquid flux generation to feed the gap between the solidifying shell and the mould wall, even in hard casting conditions. In this paper it is presented the behavior of different sources of carbon on melting rate evaluation, through thermal analysis and by using specific equipment specially developed for this study.

ESTUDO DO EFEITO DO CARBONO NA APLICAÇÃO DE FLUXANTES PARA LINGOTAMENTO CONTÍNUO DE AÇOS