Baoji Zhipu Non-Ferrous Metals Processing Co.,Ltd is one of the most famous China niobium bar manufacturers and suppliers, welcome to wholesale cheap niobium rod products from our company and factory. Niobium metal is gray.melting point2468℃,boiling point4742℃,density8.57g/cm³.Niobium metal is stable in the air at room temperature.In the oxygen niobium metal not be completely oxidation.Under the high temperature niobium metal can be combined with C,N,S directly.And niobium metal can be with Ti,Zr,W to alloy.Not with inorganic acid or alkali, not soluble in aqua regia, but soluble in hydrofluoric acid. Product name niobium bar grade Nb1,Nb2 Standard GB/T14842-2007 purity ≥99.95% state annealing state(M) or hard state(Y) Medical composition: grade Element content(%) Zr Ti C N O H Ta Fe Si W Ni Mo Cr Hf Nb Nb1 0.02 0.002 0.01 0.015 0.015 0.001 0.10 0.005 0.005 0.03 0.005 0.010 0.002 — remain Nb2 0.02 0.005 0.02 0.05 0.025 0.005 0.25 0.03 0.02 0.05 0.01 0.05 0.01 — remain NbZr1 0.8~1.2 0.02 0.01 0.01 0.015 0.0015 0.10 0.005 0.005 0.03 0.005 0.01 0.002 — remain C-103 0.7 0.7~1.3 0.015 0.015 0.023 0.002 0.5 — — 0.5 — — — 9.0~11.0 remain Cb752 2.0~3.0 0.2 0.015 0.01 0.02 0.0015 0.5 — — 9.0~11.0 — — — 0.2 remain tolerance: Diameter Diameter tolerance length Length tolerance Forged bar Crowed bar Rolled bar polished bar 3.0~4.5 ±0.05 _ ±0.05 _ 200~1500 +5 >4.5~6.5 ±0.10 _ ±0.10 _ 200~1500 >6.5~10.0 ±0.15 _ ±0.15 _ 200~1500 >10.0~16.0 ±0.20 _ ±0.20 _ 200~2000 +20 >16.0~18.0 ±1.0 _ _ ±0.30 200~2000 >18.0~25.0