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Cobalt, Co
Categories: Metal; Nonferrous Metal; Cobalt Alloy; Pure Element

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Physical PropertiesMetricEnglishComments
Density 8.80 g/cc0.318 lb/in³
 
Chemical PropertiesMetricEnglishComments
Atomic Mass 58.93320158.9332011995
Atomic Number 2727
Thermal Neutron Cross Section 34.8 barns/atom34.8 barns/atom
X-ray Absorption Edge 1.608 Å1.608 ÅK
 13.343 Å13.343 ÅLI
 15.534 Å15.534 ÅLII
 15.8314 Å15.8314 ÅLIII
Electrode Potential -0.280 V-0.280 V
Electronegativity 1.881.88Pauling
Ionic Radius 0.630 Å0.630 ÅCrystal Ionic Radius for Valence +3
 0.720 Å0.720 ÅCrystal Ionic Radius for Valence +2
Electrochemical Equivalent 1.1 g/A/h1.1 g/A/h
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 125125
Hardness, Vickers 253253
Tensile Strength, Yield 225 MPa32600 psi
Modulus of Elasticity 211 GPa30600 ksi
Poissons Ratio 0.320.32
Shear Modulus 82.6 GPa12000 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.00000624 ohm-cm0.00000624 ohm-cm
Magnetic Permeability 6868Initial
 <= 245<= 245
Curie Temperature 1121 °C2050 °F
 
Thermal PropertiesMetricEnglishComments
Heat of Fusion 259.6 J/g111.7 BTU/lb
Heat of Vaporization 3280 J/g1410 BTU/lb
CTE, linear  12.5 µm/m-°C
@Temperature 20.0 - 100 °C
6.94 µin/in-°F
@Temperature 68.0 - 212 °F
 14.2 µm/m-°C
@Temperature 200 °C
7.89 µin/in-°F
@Temperature 392 °F
Specific Heat Capacity 0.440 J/g-°C0.105 BTU/lb-°F
Thermal Conductivity 69.21 W/m-K480.3 BTU-in/hr-ft²-°F
Melting Point 1493 °C2719 °F
Boiling Point 2927 °C5301 °F
 
Optical PropertiesMetricEnglishComments
Emissivity (0-1) 0.13
@Temperature 500 °C
0.13
@Temperature 932 °F
unoxidized, total spectrum
Reflection Coefficient, Visible (0-1) 0.370.37200 nm
 0.6750.6751060 nm
 
Component Elements PropertiesMetricEnglishComments
Cobalt, Co 100 %100 %
 
Descriptive Properties
CAS Number7440-48-4

References for this datasheet.

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