Tantalum, UNS R05200

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$Refractory Metals$

Tantalum, UNS R05200
Categories:	Metal; Nonferrous Metal; Refractory Metal; Pure Element
Material Notes:	All values may vary dependent on specific design and usage Capabilities: Wire Ribbon Square Insulated Plated Some information provided by California Fine Wire.
Key Words:	ASTM B365
Vendors:	Eagle Alloys Corporation is a leading supplier of quality metals and alloys. Our staff prides itself on working fast, efficiently and courteously to get you the information you need. Call (800) 237-9012 or visit www.EagleAlloys.com. PLANSEE SE: Whether it's high temperatures, aggressive chemicals or extreme mechanical loading: PLANSEE supplies a suitable product solution in refractory metals or composite materials. As the world market leader in powder metallurgically produced high performance materials we combine outstanding materials knowledge with profound applications and technology know-how. Visit us at www.plansee.com. Click here to view all available suppliers for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Metric	English	Comments

Density	16.6 g/cc	0.600 lb/in³
Vapor Pressure	6.298e-9 bar @Temperature 2351 °C	0.000004724 torr @Temperature 4264 °F
	7.488e-9 bar @Temperature 2365 °C	0.000005616 torr @Temperature 4289 °F
	4.019e-8 bar @Temperature 2487 °C	0.00003014 torr @Temperature 4509 °F
	9.82e-8 bar @Temperature 2566 °C	0.0000737 torr @Temperature 4651 °F
	1.72e-7 bar @Temperature 2615 °C	0.000129 torr @Temperature 4739 °F
	2.44e-7 bar @Temperature 2652 °C	0.000183 torr @Temperature 4806 °F
	3.703e-7 bar @Temperature 2675 °C	0.0002777 torr @Temperature 4847 °F

Chemical Properties	Metric	English	Comments
Atomic Mass	180.9479	180.9479	1995
Atomic Number	73	73
Thermal Neutron Cross Section	21.3 barns/atom	21.3 barns/atom
X-ray Absorption Edge	0.18393 Å	0.18393 Å	K
	1.06084 Å	1.06084 Å	L_I
	1.11264 Å	1.11264 Å	L_II
	1.25427 Å	1.25427 Å	L_III
Electrode Potential	4.1 V	4.1 V
Electronegativity	1.5	1.5	Pauling
Ionic Radius	0.680 Å	0.680 Å	Crystal Ionic Radius for Valence +5

Mechanical Properties	Metric	English	Comments
Vickers Microhardness	70 - 80	70 - 80	Electron beam melted, cold rolled, then annealed at 1200°C
Tensile Strength at Break	345 MPa	50000 psi	Annealed
	517 MPa	75000 psi	Stress relieved
	689 MPa	100000 psi	Hard
Tensile Strength, Ultimate	205 - 276 MPa	29700 - 40000 psi	Electron beam melted, cold rolled, then annealed at 1200°C
Tensile Strength, Yield	165 - 180 MPa @Strain 0.2 %	23900 - 26100 psi @Strain 0.2 %	Electron beam melted, cold rolled, then annealed at 1200°C
Elongation at Break	35 - 70 %	35 - 70 %	Electron beam melted, cold rolled, then annealed at 1200°C
Modulus of Elasticity	179 - 185 GPa	26000 - 26800 ksi	Electron beam melted, cold rolled, then annealed at 1200°C

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000124 ohm-cm	0.0000124 ohm-cm	3% tolerance on sizes below 0.02, 5% tolerance on sizes above 0.02

Thermal Properties	Metric	English	Comments
CTE, linear	6.50 µm/m-°C @Temperature 20.0 °C	3.61 µin/in-°F @Temperature 68.0 °F
Specific Heat Capacity	0.138 J/g-°C @Temperature 20.0 °C	0.0330 BTU/lb-°F @Temperature 68.0 °F
Thermal Conductivity	59.4 W/m-K	412 BTU-in/hr-ft²-°F
Melting Point	2890 °C	5234 °F
Boiling Point	5458 °C	9856 °F
Maximum Service Temperature, Air	500 °C	932 °F	Operating Temperature

Component Elements Properties	Metric	English	Comments
Tantalum, Ta	99.96 %	99.96 %	alternate source states 99.98%

Descriptive Properties
Magnetic	None
Temperature Coefficient of Resistance	0.0038 ohms/ohm-°C		0-100°C
Thermal EMF vs. Copper	-0.004

References for this datasheet.

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