#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
  supertype:  metallic_element__metal  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  substance of:  steel  iron_ore
  subtype:  alpha_iron__alphairon  a magnetic allotrope of iron; stable below 906 degrees centigrade
  subtype:  beta_iron  an allotrope of iron that is the same as alpha iron except that it is nonmagnetic; stable between 768 and 906 degrees centigrade
  subtype:  gamma_iron__gammairon  a nonmagnetic allotrope of iron that is the basis of austenite; stable between 906 and 1403 degrees centigrade
  subtype:  delta_iron__deltairon  an allotrope of iron that is stable between 1403 degrees centigrade and the melting point (= 1532 degrees)
  subtype:  ingot_iron__ingotiron  iron of high purity
  subtype:  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:  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
  subtype:  wrought_iron__wroughtiron  iron having a low carbon content that is tough and malleable and so can be forged and welded
     subtype:  Swedish_iron  wrought iron of high purity made in Sweden
  subtype:  galvanized_iron  iron that is coated with zinc to protect it from rust
  subtype:  pig_iron__pigiron  crude iron tapped from a blast furnace
     subtype:  basic_iron__basiciron  pig iron containing a high percentage of phosphorus; used in making steel by a process that removes the phosphorus
     subtype:  cinder_pig  pig iron containing a substantial proportion of slag
     subtype:  mine_pig  pig iron made entirely from ore
     subtype:  spiegeleisen__spiegel__spiegel_iron__spiegeliron  pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel
  subtype:  scrap_iron__scrapiron  iron to be melted again and reworked
  subtype:  structural_iron  iron that has been cast or worked in structural shapes

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