Specification for niobium metal Chemistry (ppm) max. Elements Nb Ta O N C Si Fe W Mo Ti Cu Cr Ni Zr Specification Balance 2000 400 300 100 400 100 100 100 50 50 50 50 50 Actual content Balance 650 130 70 25 130 50 30 50 40 50 30 30 30 Baoji lihua non-ferrous metals co., ltd. Is specialized in titanium (ti), tantalum (ta), niobium(nb) and its alloy plate, sheet, foil, strip, target, tape, rod, bar, wire, tube, pipe.