Ferro-tungsten is a master alloy for the production of tungsten-containing steels. The raw materials for ferro-tungsten production are rich ore or ore concentrates of wolframite or scheelite. Also artificial scheelite or soft scrap can be used. The tungsten trioxide in these compounds can be reduced either carbothermically in electric arc furnaces or metallothermically by silicon and/or aluminum. Also a mixed carbothermic-silicothermic production is in use.
Commercial ferro-tungsten contains between 75 and 85% W. It has a steel grey appearance and a fine-grained structure consisting of FeW and Fe2W. It is supplied in 80–100 mm lumps