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R30816 Cobalt vs. Ductile Cast Iron

R30816 cobalt belongs to the cobalt alloys classification, while ductile cast iron belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 210
170 to 180
Elongation at Break, % 23
2.1 to 20
Poisson's Ratio 0.3
0.28 to 0.31
Shear Modulus, GPa 81
64 to 70
Tensile Strength: Ultimate (UTS), MPa 1020
460 to 920
Tensile Strength: Yield (Proof), MPa 460
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1540
1160
Melting Onset (Solidus), °C 1460
1120
Specific Heat Capacity, J/kg-K 420
490
Thermal Conductivity, W/m-K 13
31 to 36
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 20
1.5
Embodied Energy, MJ/kg 320
21
Embodied Water, L/kg 440
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 510
280 to 1330
Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 22
24 to 26
Strength to Weight: Axial, points 31
17 to 35
Strength to Weight: Bending, points 25
18 to 29
Thermal Diffusivity, mm2/s 3.3
8.9 to 10
Thermal Shock Resistance, points 28
17 to 35

Alloy Composition

Carbon (C), % 0.32 to 0.42
3.0 to 3.5
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
93.7 to 95.5
Manganese (Mn), % 1.0 to 2.0
0
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 0.080
Silicon (Si), % 0 to 1.0
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0