1.1 This specification covers wrought niobium and niobium alloy seamless and welded tubes as follows: 1.1.1 R04200-Type 1—Reactor grade unalloyed niobium, This specification covers wrought niobium and niobium alloy seamless and welded tubes. Material covered by this specification shall be made from ingots that are produced by vacuum or plasma arc melting, vacuum electron-beam melting, or a combination of