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R30021 Cobalt vs. R30816 Cobalt

Both R30021 cobalt and R30816 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 R30021 cobalt and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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