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Grey Cast Iron vs. R30012 Cobalt

Grey cast iron belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 570 to 1290
1770
Elastic (Young's, Tensile) Modulus, GPa 180
220
Elongation at Break, % 9.6
1.0
Fatigue Strength, MPa 69 to 170
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 160 to 450
830
Tensile Strength: Yield (Proof), MPa 98 to 290
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1380
1470
Melting Onset (Solidus), °C 1180
1280
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.5
8.8
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 21
120
Embodied Water, L/kg 44
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
960
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 5.8 to 17
26
Strength to Weight: Bending, points 8.7 to 17
22
Thermal Diffusivity, mm2/s 13
3.8
Thermal Shock Resistance, points 6.0 to 17
23

Alloy Composition

Carbon (C), % 3.1 to 3.4
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 92.1 to 93.9
0 to 3.0
Manganese (Mn), % 0.5 to 0.7
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.9
0
Silicon (Si), % 2.5 to 2.8
0 to 2.0
Sulfur (S), % 0 to 0.15
0
Tungsten (W), % 0
7.5 to 9.5