Brown fused alumina is electrically fused in an arc-furnace from a mixture of bauxite, coke (anthracite) as main raw materials at high temperature. Its chemical composition contains AL2O3, TIO2, a small amount of SIO2 and FE2O3, est., micro-hardness: 1800-2200KG/MM2, its toughness is higher than silicon carbide. Abrasive articles made of it are suited for grinding metals of high-tensile strength such as steel, annealed malleable iron and hard high-class refractory products.