#cast_iron  an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting
  supertype:  Fe__iron__atomic_number_26  a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood
  substance:  pearlite  pig_iron
  subtype:  alloy_iron__alloyiron__alloycastiron  cast iron containing alloying elements (usually nickel or chromium or copper or molybdenum) to increase the strength or facilitate heat treatment
     subtype:  Ni-hard_iron__Ni-hard  cast iron to which nickel has been added to make it resist abrasion
     subtype:  Ni-resist_iron__Ni-resist  cast iron consisting of graphite in a matrix of austenite
  subtype:  pot_metal.cast_iron__potmetal  cast iron used for making cooking wares

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