... )2)its alloy(Ta10W, Ta2.5W, Ta40Nb) plate, sheet, foil, strip, ribbon, tape, rod, bar, wire, tube and pipe3)according to ASTM ... ) and its alloy(Ta10W, Ta2.5W, Ta40Nb) plate, sheet, foil, strip, ribbon, tape, rod, bar, wire, tube and pipe according to ASTM ...