Desenvolvimento de escória sintética sinterizada para produção de aços elétricos de grão orientado (GO)

Abstract

Its know that one of the biggest challenges during silicon oriented grain(OG) steelmaking is the control of elements like sulfur, aluminum, titanium and phosphorus because their influence in the steels magnetic properties. The electric machine efficiency is worse with the increase of theses contaminants elements in the oriented grain steel. This work had like main aim the development of a sinterized synthetic slag to treat the OG steel in the steel plant of the ArcelorMittal Inox Brasil and increase its quality. Synthetic slag called Vamflux RGO SI was developed together Vamtec S/A, a brazilian partner and producer of goods to iron and steelmaking. The first steep in the development of the synthetic slag was the production of samples of slags to analysis and definition about their industrial production. Tests with a new slag were performed in the steel plant during GO steel production. Samples of steel and generated slag during tests were withdrawn from ladle in all phases of the process to characterization during steelmaking. New slag was developed with a special characteristic that is the chemically combination of CaO, Fe2O3 and SiO2 to decrease the desulphurization properties of the slag. Due to fact was possible produce a slag without sulfur in its composition. The results of this study have shown that with a new slag: eliminated risk of loss of run due to sulfur content in the steel; decreased of loss temperature of bath and consumption of inert gas injected into ladle to homogeneously of bath; occurred the reduction about 50% in the quantity of FeS alloy utilized to adjust sulfur content of steel; occurred the reduction in the aluminum content of the steel; occurred a much better control of binary basicity of slag and more stability of MgO content.