#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
  supertype:  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
  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

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