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Grey Cast Iron vs. R30075 Cobalt

Grey cast iron belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 27 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 grey cast iron and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
210 to 250
Elongation at Break, % 9.6
12
Fatigue Strength, MPa 69 to 170
250 to 840
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69
82 to 98
Tensile Strength: Ultimate (UTS), MPa 160 to 450
780 to 1280
Tensile Strength: Yield (Proof), MPa 98 to 290
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1180
1290
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.5
8.4
Embodied Carbon, kg CO2/kg material 1.5
8.1
Embodied Energy, MJ/kg 21
110
Embodied Water, L/kg 44
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 25
24 to 25
Strength to Weight: Axial, points 5.8 to 17
26 to 42
Strength to Weight: Bending, points 8.7 to 17
22 to 31
Thermal Diffusivity, mm2/s 13
3.5
Thermal Shock Resistance, points 6.0 to 17
21 to 29

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 3.1 to 3.4
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Iron (Fe), % 92.1 to 93.9
0 to 0.75
Manganese (Mn), % 0.5 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.9
0 to 0.020
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2