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Grey Cast Iron vs. R30001 Cobalt

Grey cast iron belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 570 to 1290
1930
Elastic (Young's, Tensile) Modulus, GPa 180
220
Elongation at Break, % 9.6
1.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 160 to 450
620

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1380
1530
Melting Onset (Solidus), °C 1180
1260
Specific Heat Capacity, J/kg-K 490
430
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 11
11

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
9.0
Embodied Carbon, kg CO2/kg material 1.5
8.9
Embodied Energy, MJ/kg 21
130
Embodied Water, L/kg 44
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 5.8 to 17
19
Strength to Weight: Bending, points 8.7 to 17
18
Thermal Diffusivity, mm2/s 13
3.7
Thermal Shock Resistance, points 6.0 to 17
19

Alloy Composition

Carbon (C), % 3.1 to 3.4
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
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
11 to 13