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R30816 Cobalt vs. R30021 Cobalt

Both R30816 cobalt and R30021 cobalt are cobalt alloys. They have 74% of their average alloy composition in common. There are 25 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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
9.0
Fatigue Strength, MPa 250
250
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 1020
700
Tensile Strength: Yield (Proof), MPa 460
500

Thermal Properties

Latent Heat of Fusion, J/g 300
330
Melting Completion (Liquidus), °C 1540
1350
Melting Onset (Solidus), °C 1460
1190
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.4
Embodied Carbon, kg CO2/kg material 20
8.0
Embodied Energy, MJ/kg 320
110
Embodied Water, L/kg 440
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
57
Resilience: Unit (Modulus of Resilience), kJ/m3 510
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
23
Strength to Weight: Bending, points 25
21
Thermal Diffusivity, mm2/s 3.3
3.8
Thermal Shock Resistance, points 28
21

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.2 to 0.35
Chromium (Cr), % 19 to 21
26 to 29
Cobalt (Co), % 40 to 49.8
61.7 to 67.3
Iron (Fe), % 0 to 5.0
0 to 3.0
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 3.5 to 4.5
4.5 to 6.0
Nickel (Ni), % 19 to 21
2.0 to 3.0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0