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R30155 Cobalt vs. SAE-AISI T8 Steel

Both R30155 cobalt and SAE-AISI T8 steel are iron alloys. They have 44% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
78
Tensile Strength: Ultimate (UTS), MPa 850
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1470
1730
Melting Onset (Solidus), °C 1420
1670
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 12
18
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
45
Density, g/cm3 8.5
9.0
Embodied Carbon, kg CO2/kg material 9.7
10
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 300
120

Common Calculations

PREN (Pitting Resistance) 37
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 28
24 to 66
Strength to Weight: Bending, points 24
21 to 41
Thermal Diffusivity, mm2/s 3.2
4.8
Thermal Shock Resistance, points 21
24 to 66

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.75 to 0.85
Chromium (Cr), % 20 to 22.5
3.8 to 4.5
Cobalt (Co), % 18.5 to 21
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 36.2
69.3 to 75.4
Manganese (Mn), % 1.0 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 2.5 to 3.5
0.4 to 1.0
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4