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R30816 Cobalt vs. SAE-AISI 5120 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI 5120 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is SAE-AISI 5120 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
150
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
16
Fatigue Strength, MPa 250
210
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1020
500
Tensile Strength: Yield (Proof), MPa 460
320

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1460
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
47
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.4
Embodied Energy, MJ/kg 320
19
Embodied Water, L/kg 440
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
71
Resilience: Unit (Modulus of Resilience), kJ/m3 510
280
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
18
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 3.3
13
Thermal Shock Resistance, points 28
16

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.17 to 0.22
Chromium (Cr), % 19 to 21
0.7 to 0.9
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
97.6 to 98.3
Manganese (Mn), % 1.0 to 2.0
0.7 to 0.9
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 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0