More than half of the world's Tungsten is used in cemented carbides, namely Tungsten carbide. Tungsten Carbide (WC) is used for machining and manufacturing tools, in World War II for armour-piercing ammunition, and for various athletic objects and high-quality surgical tools. Tungsten Carbide has about two times the stiffness of steel, and just under two times the density. It is less dense than pure W, but is much stiffer and more durable.
Pure Tungsten is used electrically because of its high melting point. Incandescent lightbulb filaments are made almost exclusively of Tungsten, having replaced Carbon filaments in 1904.
WC - Tungsten carbide, used for machining tools and armour-piercing ammunition because of its very high hardness and density
WS2 - Tungsten disulfide, used as li-ion battery anodes, and as a dry lubricant
HSS - High speed steel contains about 18% Tungsten, used because it adds hardness and temperature resistivity