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R30816 Cobalt vs. SAE-AISI T15 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI T15 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is SAE-AISI T15 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
830 to 2240

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1540
1690
Melting Onset (Solidus), °C 1460
1640
Specific Heat Capacity, J/kg-K 420
430
Thermal Conductivity, W/m-K 13
21
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.7
Embodied Carbon, kg CO2/kg material 20
16
Embodied Energy, MJ/kg 320
250
Embodied Water, L/kg 440
140

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
22
Strength to Weight: Axial, points 31
26 to 71
Strength to Weight: Bending, points 25
22 to 43
Thermal Diffusivity, mm2/s 3.3
5.6
Thermal Shock Resistance, points 28
26 to 70

Alloy Composition

Carbon (C), % 0.32 to 0.42
1.5 to 1.6
Chromium (Cr), % 19 to 21
3.8 to 5.0
Cobalt (Co), % 40 to 49.8
4.8 to 5.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
67.5 to 73.5
Manganese (Mn), % 1.0 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 3.5 to 4.5
0 to 1.0
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.15 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
11.8 to 13
Vanadium (V), % 0
4.5 to 5.3