Nb1 niobium tube Standard : ASTM B394,ASME SB394 ISO Dimension : Dia:10-120mm*length1000-6000mm ISO9001:2008,ISO14001:2004 Nb1 niobium tube 1.Material: RO4200-1, Ro4210-2, Nb1,Nb22.Size: Dia:10-120mm*length<6000mm3.Standard: As per ASTM B392-984.Purity: >=99.9% or 99.95% More details,pls contact me on your any free time!