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R30021 Cobalt vs. Automotive Grey Cast Iron

R30021 cobalt belongs to the cobalt alloys classification, while automotive grey cast iron belongs to the iron 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 R30021 cobalt and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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