... nut, screw, ring, wire, foil, sheet, rod, strip, plate, tube, alloys Niobium tube UNS Designation R05400 -- non-alloyed Tantalum,powder metallurgy,concretion ... UNS Designation R05240 -- Tantalum alloys, 60% Ta,40% Nb alloys,electron bombardment or vacuum ARC melting.or both. Size : O.D ... nut, screw ,ring ,wire, foil, sheet, rod, strip, plate, tube, alloys according to Standard ASTM AMS ASME MIL DMS JIS ...