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Our company specialize in manufacture and sale of Tantalum Niobium Tantalum alloy and Niobium alloy, such as wires, alloy wires, etc, sheets, wires, rods, bars, plates, seamless tubes, targets, crucibles capillary tube, welded tubing sputtering target etc. in conformity with ASTM. For more details please go to our website, and welcome to China to visit our company. Tantalum tubes Tantalum- tungsten alloy tubes Material: RO5200, RO5400, RO5252(Ta-2.5W), RO5255(Ta-10W) size: Diameter: φ1.0-120mm Thickness: 0.2-5.0mm Length: 200mm-6000mm Standard: As per ASTM B521-98 Purity: >=99.95% or 99.99% Table 1. Chemical composition: Chemistry % Designation Chief component Impurities maxmium Ta Nb Fe Si Ni W Mo Ti Nb O C H N Ta1 Remainder 0.004 0.003 0.002 0.004 0.004 0.002 0.03 0.015 0.004 0.0015 0.002 Ta2 Remainder 0.01 0.01 0.005 0.02 0.02 0.005 0.08 0.02 0.01 0.0015 0.01 Table2. Permissible variations in diameter & wall thicknessOutside diameter, inch (mm) Diameter tolerance, inch(mm), +/-Permissible variaton in wall thickness, %, +/-<1 (25.4)0.004 (0.102)101 1.5 (25.4 38.1)0.005 (0.127)101.5 2 (38.1 50.8)0.006 (0.152)102 2.5 (50.8 63.5)0.007 (0.178)102.5 3.5 (63.5 88.9)0.010 (0.254)10Table3. Mechanical requirements (annealed condition)Grade Tensile strength δbpsi (MPa), ≥Yield strengthδ0.2, psi (MPa),≥Elongation in 1"/2" gage length, %, ≥RO5200/RO540030000 (207)20000 (138)25RO525240000 (276)28000(193)20RO525570000 (481)60000 (414)15RO524040000(276)28000 (193)20 Special requirements to be agreed on by the supplier and buyer of negotiation