Specification for Niobium and Niobium Alloy Bar, Rod, and Wire

This specification covers four grades of wrought niobium and niobium alloy bar, rod, and wire as R04200-Type 1, reactor grade unalloyed niobium; R04210-Type 2, commercial grade unalloyed niobium; R04251-Type 3, reactor grade niobium alloy containing 1 % zirconium; and R04261-Type 4, commercial grade niobium alloy containing 1 % zirconium. The chemical; and mechanical properties requirements, such as Brinell hardness, tensile strength, yield strength, and elongations; as well as the temper designations are detailed.