WordNet (r) 3.0 (2006):

steelworks
    n 1: a factory where steel is made [syn: steel mill,
         steelworks, steel plant, steel factory]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "steelworks":
   blacksmith shop, bleachworks, bloomery, bottling works, brassworks,
   copperworks, dye works, forge, foundry, furnace, gasworks,
   glassworks, ironworks, metalworks, paper works, printworks,
   saltworks, scrapworks, smelter, smithery, smithy, soapworks,
   starchworks, steel mill, stithy, tileworks, tryworks, tubeworks,
   waterworks, wireworks, works