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GLASS-CERAMIC FROM STEELMAKING SLAG.The manufacture of glass-ceramics is an alternative route for the commercial use of metallurgical slags.Such types of glass-ceramics may find commercial applications owing to their low cost, good mechanical properties and superior visual aspect.Besides, due to the elimination of that industrial residue from the environment and also due to the possibility of replacement of natural stones such as marbles and granites, the use of slags is an activity with strong ecological appeal.While the use of blast-furnace slags for the production of glass-ceramics is well known, the utilization of steel making slags constitutes a challenge, because these materials possess low concentration of SiO 2 .In this work a novel composition for producing glasses and glass-ceramics from a steelmaking slag is presented.The crystal nucleation kinetics, the characterization of the resulting microstructures for two different thermal treatments and mechanical properties of the glass-ceramics are discussed.A glass-ceramic having a marble aspect, fine volumetric crystallization, high degree of crystallization and improved mechanical strength was obtained.