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Specs : according to ASTM B 394 -99 R04210
Temper condition: annealed 
Chemical composition :
            C             0.01%max
            N             0.01%max
            O             0.025%max
            H             0.0015%max
            Zr            0.02%max
            Ta            0.3%max
            Fe            0.01%max
            Si             0.005%max
            W             0.05%max
            Ni             0.005%max
            Mo            0.02%max
            Hf             0.02%max
            Ti             0.03%max
            Al             0.005%max
            Nb            Remainder (99.90%MIN)
Physical & Mechanical property :
            Tensile strength     125 MPa min.
            Yield strength        85 MPa min.
            Elongation             25%min
Size available : 
1.0mm up to 38.10mm Outside Diameter x 0.2mm up to 5 mm Wall Thickness x 100mm up to 6000mm Length for Niobium Seamless Tube;

40mm up to 170 mm Outside Diameter x 1mm up to 5 mm Wall Thickness x 100mm up to 6000mm Length for Niobium Welded Tube;

Typical size :
O.D 4.0mm x Wall thickness 1mm x Length 150mm,
O.D 4.0mm x Wall thickness 1mm x Length 700mm,
O.D 6.35mm x Wall thickness 1mm x Length 1200mm,
O.D 10mm x Wall thickness 0.5mm x Length 1000mm,
O.D 12.7mm x Wall thickness 1mm x Length 1000mm,
O.D 15.875mm x Wall thickness 0.508mm x Length 178.943mm,
O.D 16mm x Wall thickness 0.5mm x Length 1000mm,
O.D 20mm x Wall thickness 1.0mm x Length 150mm,
O.D 20mm x Wall thickness 1.0mm x Length 1000mm,
O.D 22mm x Wall thickness 1.0mm x Length 150mm,
O.D 22mm x Wall thickness 1.0mm x Length 1200mm,
O.D 25mm x Wall thickness 1.0mm x Length 1000mm,
O.D 27mm x Wall thickness 1.0mm x Length 1000mm,
O.D 27mm x Wall thickness 1.0mm x Length 150mm,
O.D 32mm x Wall thickness 1.0mm x Length 1000mm,

Standard Specification ASTM B 394 -03 for Niobium Tube + Niobium Alloy Tube Seamless and Welded.
This specification covers niobium and niobium alloy seamless and welded tubes of the following grades:
1. ASTM B 394 -03 UNS R04200 -Type 1, Reactor grade unalloyed niobium;
2. ASTM B 394 -03 UNS R04210 -Type 2, Commercial grade unalloyed niobium;
3. ASTM B 394 -03 UNS R04251 -Type 3, Reactor grade niobium alloy containing 1% zirconium;
4. ASTM B 394 -03 UNS R04261 -Type 4, Commercial grade niobium alloy containing 1% zirconium;