THERMAL-PROPERTIES OF SLAG FILMS TAKEN FROM CONTINUOUS-CASTING MOLD

Measurements of the thermal diffusivity and conductivity, heat capacit y, absorption and extinction coefficients, refractive indices, and den sities have been derived for slag films taken from the continuous cast ing mould. These data have been used to analyse the mechanism for heat transfer between the steel strand and the mould. It is shown that con tributions from radiation conduction are unlikely to exceed 10% of tho se derived from lattice thermal conduction. The main factor affecting the radiation conduction was found to be the crystallinity developed i n the slag film and not the pickup of transition metal oxides by the s lag during casting.