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R31539 Cobalt vs. R30816 Cobalt

Both R31539 cobalt and R30816 cobalt are cobalt alloys. They have 71% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R31539 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, % 13 to 22
23
Fatigue Strength, MPa 310 to 480
250
Poisson's Ratio 0.29
0.3
Reduction in Area, % 13 to 23
22
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1020
Tensile Strength: Yield (Proof), MPa 590 to 940
460

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1540
Melting Onset (Solidus), °C 1290
1460
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 8.2
20
Embodied Energy, MJ/kg 110
320
Embodied Water, L/kg 530
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
190
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 33 to 44
31
Strength to Weight: Bending, points 27 to 32
25
Thermal Diffusivity, mm2/s 3.5
3.3
Thermal Shock Resistance, points 24 to 32
28

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.32 to 0.42
Chromium (Cr), % 26 to 30
19 to 21
Cobalt (Co), % 57.7 to 68.7
40 to 49.8
Iron (Fe), % 0 to 0.75
0 to 5.0
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
3.5 to 4.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
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