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ASTM B631 Class C vs. R31539 Cobalt

ASTM B631 class C belongs to the otherwise unclassified metals classification, while R31539 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class C and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180 to 190
220
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 66 to 71
86

Thermal Properties

Latent Heat of Fusion, J/g 140 to 150
320
Melting Completion (Liquidus), °C 2090 to 2230
1360
Specific Heat Capacity, J/kg-K 180
450
Thermal Conductivity, W/m-K 450 to 490
13
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 55 to 63
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 36 to 43
2.1

Otherwise Unclassified Properties

Density, g/cm3 13 to 14
8.4
Embodied Carbon, kg CO2/kg material 55 to 59
8.2
Embodied Energy, MJ/kg 860 to 920
110

Common Calculations

Stiffness to Weight: Axial, points 7.4 to 7.6
15
Stiffness to Weight: Bending, points 14
24
Thermal Diffusivity, mm2/s 180 to 200
3.5