#steel_mill__steelmill__steelworks__steel_plant__steelplant__steel_factory__steelfactory  a factory where steel is made
  supertype:  factory__mill__manufacturing_plant__manufacturingplant__manufactory  a plant consisting of buildings with facilities for manufacturing
  subtype:  rolling_mill  steel mill where metal is rolled into sheets and bars
  part:  Bessemer_converter  a refractory-lined furnace used to convert pig iron into steel by the Bessemer process
  part:  blast_furnace__blastfurnace  a furnace for smelting of iron from iron oxide ores; combustion is intensified by a blast of air
  part:  Stassano_furnace__electric-arc_furnace  an electric furnace in which an electric arc provides the source of heat for making steel

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