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ASTM B 392 Niobium Wire 1. Information Of ASTM B392 Niobium & Niobium Alloy Wire: Name Niobium & Niobium Alloy Wire Grade Nb1,Nb2,NbZr1,RO4200,RO4210 Purity ≥ 99.95% Diameter ≥ 0.02mm Surface Bright ...