#copper-base_alloy  any alloy whose principal component is copper
  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"
  subtype:  brass__bras  an alloy of copper and zinc
     subtype:  alpha-beta_brass__Muntz_metal__yellow_metal  a brass that has more zinc and is stronger than alpha brass; used in making castings and hot-worked products
        subtype:  manganese_bronze__manganesebronze__highstrengthbras  a brass with from 1-4% manganese to harden it
        subtype:  naval_brass__navalbras__Admiralty_brass__Admiralty_Metal__Tobin_bronze  alpha-beta brass containing tin; resistant to sea water; Admiralty Metal is a trademark
     subtype:  alpha_brass__alphabras  a brass-zinc alloy; used mainly for cold working
     subtype:  bearing_brass__bearingbras  a brass bushing or a lining for a bearing
     subtype:  cartridge_brass__cartridgebras  a copper-zinc alloy (containing about 30% zinc) that is wrought into cartridges or tubing
     subtype:  gilding_metal__gildingmetal  a brass that is rich in copper; used to make articles that were to be gilded
     subtype:  high_brass  brass with 35% zinc
     subtype:  latten  brass (or a yellow alloy resembling brass) that was hammered into thin sheets; formerly used for church utensils
     subtype:  low_brass__lowbras  brass with 30% (or less) zinc
     subtype:  ormolu  brass that looks like gold; used to decorate furniture
     subtype:  red_brass__guinea_gold  brass with enough copper to give it a reddish tint; used for plumbing pipe and other brass hardware and in cheap jewelry
  subtype:  bronze  an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin
     subtype:  gunmetal  a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water)
     subtype:  phosphor_bronze  a corrosion-resistant bronze containing phosphorus; used in bearings and gears
     subtype:  alpha_bronze__alphabronze  a copper-tin alloy that can be worked
     subtype:  bell_metal  bronze with 3 or 4 parts copper to 1 part tin; used in making bells
     subtype:  beryllium_bronze__berylliumbronze  a copper-base alloy containing beryllium
     subtype:  leaded_bronze  bronze to which 1-4% lead is added
     subtype:  nickel_bronze  a bronze containing up to 30% nickel
     subtype:  silicon_bronze__siliconbronze  a bronze with 2-3% silicon that is resistant to corrosion
  subtype:  cupronickel  a 60/40 alloy of copper and nickel
  subtype:  aluminum_bronze__aluminium_bronze__aluminiumbronze  a copper-aluminum alloy with high tensile strength and resistance to corrosion
  subtype:  constantan__Eureka  a copper-nickel alloy with high electrical resistance and a low temperature coefficient; used as resistance wire

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