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Automotive Malleable Cast Iron vs. R31539 Cobalt

Automotive malleable cast iron belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 26 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 automotive malleable cast iron and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
220
Elongation at Break, % 1.0 to 10
13 to 22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 70
86
Tensile Strength: Ultimate (UTS), MPa 350 to 720
1000 to 1340
Tensile Strength: Yield (Proof), MPa 220 to 590
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1410
1360
Melting Onset (Solidus), °C 1370
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 41
13
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 1.5
8.2
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 45
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
780 to 2000
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 13 to 26
33 to 44
Strength to Weight: Bending, points 14 to 24
27 to 32
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 9.9 to 21
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 2.2 to 2.9
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 93.6 to 96.7
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0.15 to 1.3
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0.020 to 0.15
0
Silicon (Si), % 0.9 to 1.9
0 to 1.0
Sulfur (S), % 0.020 to 0.2
0

Comparable Variants