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Aluminum nanocomposites demonstrate improvements in the mechanical properties, as well as in thermal and electric conductivity. The incorporation of multiwalled carbon nanotubes (MWCNT) in the aluminum matrix, using conventional melting methods, is a long-standing issue. In this paper, Aluminum nanocomposites were fabricated via conventional casting method, using a nanostructured stainless-steel (SS) powder. Carbon nanotubes were treatment treated with hydrogen peroxide, allowed which led to an attachment with to the metal matrix particles. In this sense, The the SS powder, added as an element alloy, refinement refined the grains, and the MWCNT providedled the electric conductive to a better performance. Given this, the best alloy analyzed presented an approximate 10% increase in all of its characterized properties, that is,therefore presenting a microhardness of 48 HV, a Ultimate Tensile Stress of 183 Mpa, and and an electrical conductivity of 67% of IACS..