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ASTM B631 Class C vs. R30816 Cobalt

ASTM B631 class C belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 14 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class C and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180 to 190
210
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 66 to 71
81

Thermal Properties

Latent Heat of Fusion, J/g 140 to 150
300
Melting Completion (Liquidus), °C 2090 to 2230
1540
Specific Heat Capacity, J/kg-K 180
420
Thermal Conductivity, W/m-K 450 to 490
13
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 13 to 14
9.1
Embodied Carbon, kg CO2/kg material 55 to 59
20
Embodied Energy, MJ/kg 860 to 920
320

Common Calculations

Stiffness to Weight: Axial, points 7.4 to 7.6
13
Stiffness to Weight: Bending, points 14
22
Thermal Diffusivity, mm2/s 180 to 200
3.3