#alloy_steel__alloysteel  steel who characteristics are determined by the addition of other elements in addition to carbon
  supertype:  steel  an alloy of iron with small amounts of carbon; widely used in construction; mechanical properties can be varied over a wide range
  subtype:  stainless_steel__chromium_steel  steel containing chromium that makes it resistant to corrosion
  subtype:  chrome-nickel_steel__Elinvar  Elinvar is a trademark for a kind of nickel-chromium steel used for watch springs because its elasticity is constant over a wide range of temperatures
  subtype:  chrome-tungsten_steel  a steel alloy made with chromium and tungsten
  subtype:  austenitic_manganese_steel__manganese_steel__manganesesteel  a steel with a relatively large component (10-14%) of manganese; highly resistant to wear and shock
  subtype:  molybdenum_steel  steel containing 10-15% molybdenum; properties are similar to tungsten steel
  subtype:  nickel_steel  an alloy steel containing nickel
  subtype:  tool_steel  alloy steel that is suitable for making tools; is hard a tough and can retain a cutting edge
     subtype:  high-speed_steel__hot-work_steel  an alloy steel that remains hard at a red heat; used to make metal-cutting tools
  subtype:  tungsten_steel__wolfram_steel__wolframsteel  a very hard heat-resistant steel containing tungsten
  subtype:  vanadium_steel  steel alloyed with vanadium for greater strength and high-temperature stability

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