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R30016 Cobalt vs. SAE-AISI A8 Steel

R30016 cobalt belongs to the cobalt alloys classification, while SAE-AISI A8 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is SAE-AISI A8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
74
Tensile Strength: Ultimate (UTS), MPa 1010
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1480
Melting Onset (Solidus), °C 1270
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
37
Thermal Expansion, µm/m-K 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
9.5

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 7.7
2.3
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 500
73

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
25 to 68
Strength to Weight: Bending, points 26
22 to 44
Thermal Diffusivity, mm2/s 3.9
9.9
Thermal Shock Resistance, points 24
22 to 62

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.5 to 0.6
Chromium (Cr), % 28 to 32
4.8 to 5.5
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
88.5 to 91.9
Manganese (Mn), % 0.5 to 2.0
0 to 0.5
Molybdenum (Mo), % 0 to 1.5
1.2 to 1.7
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.2 to 2.0
0.75 to 1.1
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 3.5 to 5.5
1.0 to 1.5