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Grey Cast Iron vs. R30816 Cobalt

Grey cast iron belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
280
Elastic (Young's, Tensile) Modulus, GPa 180
210
Elongation at Break, % 9.6
23
Fatigue Strength, MPa 69 to 170
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 69
81
Tensile Strength: Ultimate (UTS), MPa 160 to 450
1020
Tensile Strength: Yield (Proof), MPa 98 to 290
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1380
1540
Melting Onset (Solidus), °C 1180
1460
Specific Heat Capacity, J/kg-K 490
420
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.5
9.1
Embodied Carbon, kg CO2/kg material 1.5
20
Embodied Energy, MJ/kg 21
320
Embodied Water, L/kg 44
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
190
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 5.8 to 17
31
Strength to Weight: Bending, points 8.7 to 17
25
Thermal Diffusivity, mm2/s 13
3.3
Thermal Shock Resistance, points 6.0 to 17
28

Alloy Composition

Carbon (C), % 3.1 to 3.4
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 92.1 to 93.9
0 to 5.0
Manganese (Mn), % 0.5 to 0.7
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.9
0 to 0.040
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5