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ASTM B631 Class A vs. R31539 Cobalt

ASTM B631 class A 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 A and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
86

Thermal Properties

Latent Heat of Fusion, J/g 160
320
Melting Completion (Liquidus), °C 2680 to 2690
1360
Specific Heat Capacity, J/kg-K 160
450
Thermal Conductivity, W/m-K 420
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
2.1

Otherwise Unclassified Properties

Density, g/cm3 15
8.4
Embodied Carbon, kg CO2/kg material 43
8.2
Embodied Energy, MJ/kg 670
110

Common Calculations

Stiffness to Weight: Axial, points 8.5
15
Stiffness to Weight: Bending, points 14
24
Thermal Diffusivity, mm2/s 180
3.5