MatWeb, The Online Materials Database

Cobalt, Co

Subcategory: Metal; Nonferrous Metal; Pure Element

Component    Wt. % Co 100

Physical Properties	Metric	English	Comments
Density	8.8 g/cc	0.318 lb/in³
Mechanical Properties
Hardness, Brinell	125	125
Hardness, Vickers	253	253
Tensile Strength, Yield	225 MPa	32600 psi
Modulus of Elasticity	211 GPa	30600 ksi
Poisson's Ratio	0.32	0.32
Shear Modulus	82.6 GPa	12000 ksi
Electrical Properties
Electrical Resistivity	6.24e-006 ohm-cm	6.24e-006 ohm-cm
Magnetic Permeability	Max 245	Max 245
Magnetic Permeability	68	68	Initial
Curie Temperature	1121 °C	2050 °F
Thermal Properties
Heat of Fusion	259.6 J/g	112 BTU/lb
CTE, linear 20°C	12.5 µm/m-°C	6.94 µin/in-°F	over the range 20-100ºC
CTE, linear 250°C	14.2 µm/m-°C	7.89 µin/in-°F	at 200°C
Specific Heat Capacity	0.44 J/g-°C	0.105 BTU/lb-°F
Thermal Conductivity	69.21 W/m-K	480 BTU-in/hr-ft²-°F
Melting Point	1493 °C	2720 °F
Optical Properties
Emissivity (0-1)	0.13	0.13	500°C unoxidized, total spectrum
Reflection Coefficient, Visible (0-1)	0.37	0.37	200 nm
Reflection Coefficient, Visible (0-1)	0.675	0.675	1060 nm
Descriptive Properties
CAS Number	7440-48-4

References are available for this material.