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R30816 Cobalt vs. Grey Cast Iron

R30816 cobalt belongs to the cobalt alloys classification, while grey cast iron belongs to the iron 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 R30816 cobalt and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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