#steel  an alloy of iron with small amounts of carbon; widely used in construction; mechanical properties can be varied over a wide range
  supertype:  alloy__metal  a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
  substance:  Fe  pearlite
  subtype:  alloy_steel__alloysteel  steel who characteristics are determined by the addition of other elements in addition to carbon
     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
  subtype:  austenitic_steel  steel that has enough nickel and chromium or manganese to retain austenite at atmospheric temperatures
  subtype:  case-hardened_steel  steel with a surface that is much harder than the interior metal
  subtype:  carbon_steel  steel whose characteristics are determined by the amount of carbon it contains
     subtype:  drill_steel__drillsteel__drill_rod__drillrod  carbon steel used for rock drills and dowels
     subtype:  eutectoid_steel__eutectoidsteel  a steel that contains 0.9% carbon (the eutectic point in the iron-carbon system); a carbon steel with 0.9% carbon is pure pearlite
     subtype:  hyper-eutectoid_steel__hypereutectoidsteel  a steel that contains more than 0.9% carbon
     subtype:  hypo-eutectoid_steel  a steel that contains less that 0.9% carbon
  subtype:  crucible_steel  steel made by the mixture of molten wrought iron, charcoal, and other substances in a crucible
  subtype:  Damascus_steel__Damask_steel  a hard resilient steel often decorated and used for sword blades
  subtype:  chisel_steel  steel used in making chisels
  subtype:  hard_steel  steel with more than 0.3% carbon
  subtype:  medium_steel  steel with 0.15-0.3% carbon
  subtype:  mild_steel__low-carbon_steel__soft-cast_steel  steel with less than 0.15% carbon
  subtype:  quenched_steel  steel that has been hardened by immersing it in water or oil to cool it
     subtype:  oil-hardened_steel  steel that is quenched in oil
  subtype:  structural_steel  a strong steel that is rolled into shapes that are used in construction

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