H.C. Starck NRC® 4N5 (UNS R05200) Electron Beam Melted Tantalum

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H.C. Starck NRC® 4N5 (UNS R05200) Electron Beam Melted Tantalum
Categories:	Metal; Nonferrous Metal; Refractory Metal; Pure Element
Material Notes:	Applications: NRC® ETA Tantalum metal products are used where purity and or ductility of the tantalum metal is more important than strength or grain size. Consequently, their primary applications are in sputtering, nickel based superalloys, explosion bonding of liners for corrosion resistance, medical, and ordnance applications All grades meet ASTM requirements. Forms Available: Sheet, Plate, Tube, Rod, Wire and Bar. Typical Purity: Purity refers to 100% minus total metallic content only, gases are omitted from the calculation. Metallic impurities are measured by GDMS, gases by Leco. Metallurgical Characteristics: Material is single-phase tantalum. Stress relieve at 1500°F, re-crystallize at 1900°F - 2100°F. Information provided by H.C. Starck.
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Physical Properties	Original Value	Comments

Density	16.6 g/cc

Chemical Properties	Original Value	Comments
Atomic Mass	180.95
Atomic Number	73
Thermal Neutron Cross Section	21.3 barns/atom

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	25 - 65	hardness as annealed, typical
Hardness, Vickers	80 - 120	hardness as annealed, typical
Tensile Strength, Ultimate	35.0 - 45.0 ksi	typical
Tensile Strength, Yield	20.0 - 30.0 ksi	typical
Modulus of Elasticity	27000 ksi

Electrical Properties	Original Value	Comments
Volume Resistivity	0.0000147 ohm-cm @Temperature 0.000 - 100 °C

Thermal Properties	Original Value	Comments
CTE, linear	3.60 µin/in-°F @Temperature 20.0 - 500 °C
Specific Heat Capacity	0.0336 BTU/lb-°F @Temperature 100 °C
Thermal Conductivity	384 BTU-in/hr-ft²-°F @Temperature 20.0 - 100 °C
Melting Point	2996 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	<= 0.00010 %
Cadmium, Cd	<= 0.00010 %
Calcium, Ca	<= 0.00010 %
Carbon, C	<= 0.0040 %
Chlorine, Cl	<= 0.00010 %
Chromium, Cr	<= 0.00010 %
Cobalt, Co	<= 0.00010 %
Copper, Cu	<= 0.00010 %
Hafnium, Hf	<= 0.00010 %
Hydrogen, H	<= 0.0010 %
Iron, Fe	<= 0.00010 %
Lead, Pb	<= 0.00010 %
Lithium, Li	<= 0.00010 %
Magnesium, Mg	<= 0.00010 %
Manganese, Mn	<= 0.00010 %
Molybdenum, Mo	<= 0.0015 %
Nickel, Ni	<= 0.00010 %
Niobium, Nb (Columbium, Cb)	<= 0.0040 %
Nitrogen, N	<= 0.0040 %
Other, each	<= 0.00010 %
Oxygen, O	<= 0.010 %
Potassium, K	<= 0.00010 %
Silicon, Si	<= 0.00010 %
Sodium, Na	<= 0.00010 %
Sulfur, S	<= 0.00010 %
Tantalum, Ta	>= 99.995 %	Balance
Thorium, Th	<= 5.0e-7 %
Tin, Sn	<= 0.00010 %
Titanium, Ti	<= 0.00010 %
Tungsten, W	<= 0.0030 %
Uranium, U	<= 5.0e-7 %
Vanadium, V	<= 0.00010 %
Yttrium, Y	<= 0.00010 %
Zinc, Zn	<= 0.00010 %
Zirconium, Zr	<= 0.00010 %

Descriptive Properties
Total Metallic Content	<0.005%

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