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R30605 Cobalt vs. Grey Cast Iron

R30605 cobalt belongs to the cobalt alloys classification, while grey cast iron belongs to the iron alloys. There are 25 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 R30605 cobalt and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
180
Elongation at Break, % 34
9.6
Fatigue Strength, MPa 260 to 590
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
69
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
160 to 450
Tensile Strength: Yield (Proof), MPa 470 to 1600
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1410
1380
Melting Onset (Solidus), °C 1330
1180
Specific Heat Capacity, J/kg-K 410
490
Thermal Conductivity, W/m-K 9.6
46
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.9

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.5
Embodied Carbon, kg CO2/kg material 9.8
1.5
Embodied Energy, MJ/kg 140
21
Embodied Water, L/kg 450
44

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
5.8 to 17
Strength to Weight: Bending, points 25 to 36
8.7 to 17
Thermal Diffusivity, mm2/s 2.5
13
Thermal Shock Resistance, points 31 to 52
6.0 to 17

Alloy Composition

Carbon (C), % 0.050 to 0.15
3.1 to 3.4
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
92.1 to 93.9
Manganese (Mn), % 1.0 to 2.0
0.5 to 0.7
Nickel (Ni), % 9.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.9
Silicon (Si), % 0 to 0.4
2.5 to 2.8
Sulfur (S), % 0 to 0.030
0 to 0.15
Tungsten (W), % 14 to 16
0