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Automotive Grey Cast Iron vs. R30021 Cobalt

Automotive grey cast iron belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
220
Elongation at Break, % 9.6 to 14
9.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69 to 70
86
Tensile Strength: Ultimate (UTS), MPa 140 to 290
700
Tensile Strength: Yield (Proof), MPa 94 to 200
500

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
330
Melting Completion (Liquidus), °C 1380 to 1390
1350
Melting Onset (Solidus), °C 1340 to 1350
1190
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 41 to 43
15
Thermal Expansion, µm/m-K 12 to 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.5 to 7.6
8.4
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.0
Embodied Energy, MJ/kg 21 to 24
110
Embodied Water, L/kg 44 to 51
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
57
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.2 to 11
23
Strength to Weight: Bending, points 8.0 to 13
21
Thermal Diffusivity, mm2/s 11 to 12
3.8
Thermal Shock Resistance, points 4.2 to 8.6
21