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Grey Cast Iron vs. G-CoCr28 Cobalt

Grey cast iron belongs to the iron alloys classification, while G-CoCr28 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 G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
210
Elongation at Break, % 9.6
6.7
Fatigue Strength, MPa 69 to 170
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
83
Tensile Strength: Ultimate (UTS), MPa 160 to 450
560
Tensile Strength: Yield (Proof), MPa 98 to 290
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1380
1330
Melting Onset (Solidus), °C 1180
1270
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 46
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
100
Density, g/cm3 7.5
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.2
Embodied Energy, MJ/kg 21
84
Embodied Water, L/kg 44
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
31
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.8 to 17
19
Strength to Weight: Bending, points 8.7 to 17
19
Thermal Diffusivity, mm2/s 13
2.2
Thermal Shock Resistance, points 6.0 to 17
14

Alloy Composition

Carbon (C), % 3.1 to 3.4
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 92.1 to 93.9
9.7 to 24.5
Manganese (Mn), % 0.5 to 0.7
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.9
0 to 0.040
Silicon (Si), % 2.5 to 2.8
0.5 to 1.5
Sulfur (S), % 0 to 0.15
0 to 0.030