Niobium Bar


Niobium Bar can be widely applied for pharmacy, semiconductor, aviation and aerospace, nuclear, high-temperature assemblies, and other fields.

Specification for Niobium Bar

Standard: As per ASTM B392

Material: R04200-Type 1 -Reactor grade unalloyed niobium
R04210-Type 2 -Commercial grade unalloyed niobium
R04251-Type 3—Reactor grade niobium alloy containing 1 % zirconium
R04261-Type 4—Commercial grade niobium alloy containing 1 % zirconium
R40220-Type 5 -RRR grade pure niobium
Size: 5x5mm to 120mm x 120mm x L<1400mm Wider bars will be named niobium plate and block.
Purity: >=99.9%

Niobium is a rare, soft, malleable, ductile, gray-white metal. It has a body-centered cubic crystalline structure and in its physical and chemical properties, it resembles tantalum. It must be placed in a protective atmosphere when processed at even moderate temperatures because it tends to react with oxygen, carbon, halogens, nitrogen, and sulfur. The metal is inert to acids, even to aqua regia at room temperatures, but is attacked by hot, concentrated acids, and especially by alkalis and oxidizing agents.

Chemical compositions for Niobium

Gr Main Content Impurities (≤ %)
Nb Fe Si Ni W Mo Ti Ta O C H N
Nb1 Bal 0.004 0.004 0.002 0.005 0.005 0.002 0.05 .012 .0035 .0012 .003
Nb2 Bal 0.01 0.01 0.005 0.02 0.01 0.004 0.07 .015 .0050 .0015 .008

Mechanical requirements (annealed condition) for Niobium bar

Grade Tensile strength,δb psi (MPa), ≥ Yield strength,δ0.2,  psi (MPa), ≥ Elongation in 1″/2″ gage length, %, ≥
R04200-1 R04210-2 18000 (125) 10500 (73) 25
Special requirements of niobium ingot to be agreed on negotiations

Machined & customized Niobium parts are also available. Contact us at for any inquiries and questions on niobium and its alloys products.

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