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Niobium (Nb)

Niobium despite presenting a high melting point in elemental form 2,468 °C, it has a low density in comparison to other refractory metals. Advantages of niobium include good corrosion resistance & excellent biocompatibility. Although its corrosion resistance is not as outstanding as that of tantalum, its lower price and greater availability make niobium attractive for less exact uses such as linings in chemical plants.

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Density  8.57 g·cm−3  Melting point 2750 K, 2477 °C, 4491 °F
Electrical resistivity (0 °C) 152 nΩ·m Vickers hardness 1320 MPa

 

ASTM B392, B393, B394: Maximum, ppm
Element
Commercial Grade
Unalloyed Niobium R04210
Commercial Grade
Niobium 1% Zirconium R04261
Oxygen
400
400
Carbon
150
150
Nitrogen
100
100
Hydrogen
15
15
 
Titanium
Gr1, Gr2, Gr3, Gr5(Ti6Al4V), Gr7, Gr9
Zirconium
Zr 702, Zr 705
Anodes/Electrodes 
Tantalum
Pure Unalloyed, 2.5% W + 97.5% Ta Alloy

Nickel Alloys
Inconel, Monel, Invar, Kovar, Hastelloy, Incoloy

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