Tantalum

Tantalum is one of many transition elements located in group 5 of the periodic table. It is a gray, heavy metal and is very corrosion resistant.
Atomic No. 73
Atomic Wt. 180.9479
Specific Gravity 16.654
Melting Point 2996˚C
Coefficient of Thermal Expansion 6.5 X 10^-6/°K
Specific Heat 0.033 cal/g/°K
Ultimate Tensile Strength (Room Temperature, Annealed) 41 ksi
Yield Tensile Strength (Room Temperature, Annealed) 25 ksi
Poisons Ratio 0.35
Modulus of Elasticity 27 X 10⁶ psi
Recrystalization Temperature 900˚C–1200˚C

General Corrosion Resistance

Tantalum is one of the most corrosion resistant ductile metals exhibiting resistance to mineral acids except hydroflouric acid, acid solutions containing fluoride ions, or free sulfur trioxide and is embrittled by alkaline materials. It is resistant to many molten metals; lithium and sodium-potassium <1000˚C, uranium <1400˚C, zinc <450˚C and bismuth <500˚C. The temperature limit for use in air is about 250˚C to 300˚C. In vacuum, or inert atmosphere, tantalum can be used at temperatures over 2000˚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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