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R30816 Cobalt vs. Automotive Malleable Cast Iron

R30816 cobalt belongs to the cobalt alloys classification, while automotive malleable cast iron belongs to the iron alloys. There are 25 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 R30816 cobalt and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
130 to 290
Elastic (Young's, Tensile) Modulus, GPa 210
180
Elongation at Break, % 23
1.0 to 10
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
70
Tensile Strength: Ultimate (UTS), MPa 1020
350 to 720
Tensile Strength: Yield (Proof), MPa 460
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Melting Completion (Liquidus), °C 1540
1410
Melting Onset (Solidus), °C 1460
1370
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
41
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.6
Embodied Carbon, kg CO2/kg material 20
1.5
Embodied Energy, MJ/kg 320
20
Embodied Water, L/kg 440
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 510
130 to 950
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
13 to 26
Strength to Weight: Bending, points 25
14 to 24
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 28
9.9 to 21

Alloy Composition

Carbon (C), % 0.32 to 0.42
2.2 to 2.9
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
93.6 to 96.7
Manganese (Mn), % 1.0 to 2.0
0.15 to 1.3
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
0.020 to 0.15
Silicon (Si), % 0 to 1.0
0.9 to 1.9
Sulfur (S), % 0 to 0.030
0.020 to 0.2
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0