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;