metallurgiaseade terase tootmiseks malmist, samuti mõningate metallurgiliste pooltoodete (vasekivi, niklikivi jt) töötlemiseks metalliks õhu või hapniku sissepuhumise teel (vt hapnikkonverter), a furnace in which air is blown through a bath of molten metal or matte, oxidizing the impurities and maintaining the temperature through the heat produced by the oxidation reaction (see: basic oxygen furnace)