Niobium

Niobium is a sister element to tantalum. It is a shiny white metal and is very ductile. It takes on a bluish cast after long exposure to air.
Atomic No. 41
Atomic Wt. 92.9064
Specific Gravity 8.57
Melting Point 2477˚C
Coefficient of Thermal Expansion 6.9 X 10^-6/°K
Specific Heat 0.063 cal/g/°K
Ultimate Tensile Strength (Room Temperature, Annealed) 30 ksi
Yield Tensile Strength (Room Temperature, Annealed) 15 ksi
Poisons Ratio 0.38
Modulus of Elasticity 15 X 10⁶ psi
Recrystalization Temperature 800˚C–1200˚C

General Corrosion Resistance

Niobium is less resistant to aggressive media than its sister element tantalum. However, it will tolerate aqua regia and small amounts of fluoride ion in acidic solutions. It is especially resistant under oxidizing conditions. Niobium is resistant to many molten metals; lithium and sodium-potassium alloy <1000˚C, uranium <1400˚C, zinc <450˚C, lead <850˚C, bismuth <500˚C and gallium <400˚C. The temperature limit for use in air is about 250˚C to 300˚C.

This data is based on laboratory testing only. Your in-plant results may differ. Testing is recommended under other conditions as needed.

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