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Automotive Grey Cast Iron vs. R30035 Cobalt

Automotive grey cast iron belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
220 to 230
Elongation at Break, % 9.6 to 14
9.0 to 46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69 to 70
84 to 89
Tensile Strength: Ultimate (UTS), MPa 140 to 290
900 to 1900
Tensile Strength: Yield (Proof), MPa 94 to 200
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
320
Melting Completion (Liquidus), °C 1380 to 1390
1440
Melting Onset (Solidus), °C 1340 to 1350
1320
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 41 to 43
11
Thermal Expansion, µm/m-K 12 to 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
100
Density, g/cm3 7.5 to 7.6
8.7
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
10
Embodied Energy, MJ/kg 21 to 24
140
Embodied Water, L/kg 44 to 51
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 5.2 to 11
29 to 61
Strength to Weight: Bending, points 8.0 to 13
24 to 39
Thermal Diffusivity, mm2/s 11 to 12
3.0
Thermal Shock Resistance, points 4.2 to 8.6
23 to 46