Tantalum Material Property Data Sheet

Tantalum, Ta; Cold Worked

Subcategory: Metal; Nonferrous Metal; Pure Metallic Element

Component    Wt. % Ta 100

Material Notes:
Cold worked applies only to tensile and/or hardness values; other property values are typical of the element.

Physical Properties	Metric	English	Comments
Density	16.65 g/cc	0.602 lb/in³
Mechanical Properties
Hardness, Brinell	195	195	Converted from Vickers for 3000 kg load/10 mm ball Brinell test.
Hardness, Rockwell A	56	56	Converted from Vickers.
Hardness, Rockwell B	92	92	Converted from Vickers.
Hardness, Rockwell C	12	12	Converted from Vickers.
Hardness, Vickers	200	200
Tensile Strength, Ultimate	900 MPa	131000 psi
Modulus of Elasticity	186 GPa	27000 ksi
Poisson's Ratio	0.35	0.35
Fatigue Strength	230 MPa	33400 psi	50,000,000 cycles. E-beam melted sample; rotating beam test.
Shear Modulus	69 GPa	10000 ksi
Electrical Properties
Electrical Resistivity	1.25e-005 ohm-cm	1.25e-005 ohm-cm
Magnetic Susceptibility	9e-007	9e-007	cgs/g
Critical Magnetic Field Strength, Oersted	823 - 835	823 - 835
Critical Superconducting Temperature	4.43 - 4.51 K	4.43 - 4.51 K
Thermal Properties
Heat of Fusion	170 J/g	73.1 BTU/lb
CTE, linear 20°C	6.5 µm/m-°C	3.61 µin/in-°F
CTE, linear 250°C	6.6 µm/m-°C	3.67 µin/in-°F
CTE, linear 500°C	6.7 µm/m-°C	3.72 µin/in-°F
CTE, linear 1000°C	6.96 µm/m-°C	3.87 µin/in-°F
Heat Capacity	0.153 J/g-°C	0.0366 BTU/lb-°F
Thermal Conductivity	54.4 W/m-K	378 BTU-in/hr-ft²-°F
Melting Point	2996 °C	5420 °F
Optical Properties
Emissivity (0-1)	0.2	0.2	total hemispherical at 1460°C
Emissivity (0-1)	0.49	0.49	650 nm
Descriptive Properties
CAS Number	7440-22-7

References are available for this material.