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ASTM B631 Class A vs. R30155 Cobalt

ASTM B631 class A belongs to the otherwise unclassified metals classification, while R30155 cobalt belongs to the iron alloys. There are 14 material properties with values for both materials. Properties with values for just one material (21, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
81

Thermal Properties

Latent Heat of Fusion, J/g 160
300
Melting Completion (Liquidus), °C 2680 to 2690
1470
Specific Heat Capacity, J/kg-K 160
450
Thermal Conductivity, W/m-K 420
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Density, g/cm3 15
8.5
Embodied Carbon, kg CO2/kg material 43
9.7
Embodied Energy, MJ/kg 670
150

Common Calculations

Stiffness to Weight: Axial, points 8.5
14
Stiffness to Weight: Bending, points 14
23
Thermal Diffusivity, mm2/s 180
3.2