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R30816 Cobalt vs. R31537 Cobalt

Both R30816 cobalt and R31537 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 R30816 cobalt and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
14 to 23
Fatigue Strength, MPa 250
310 to 480
Poisson's Ratio 0.3
0.29
Reduction in Area, % 22
13 to 23
Shear Modulus, GPa 81
87
Tensile Strength: Ultimate (UTS), MPa 1020
1000 to 1340
Tensile Strength: Yield (Proof), MPa 460
590 to 940

Thermal Properties

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

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.4
Embodied Carbon, kg CO2/kg material 20
8.1
Embodied Energy, MJ/kg 320
110
Embodied Water, L/kg 440
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 510
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
33 to 44
Strength to Weight: Bending, points 25
26 to 32
Thermal Diffusivity, mm2/s 3.3
3.4
Thermal Shock Resistance, points 28
24 to 32

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.14
Chromium (Cr), % 19 to 21
26 to 30
Cobalt (Co), % 40 to 49.8
58.9 to 69
Iron (Fe), % 0 to 5.0
0 to 0.75
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
5.0 to 7.0
Nickel (Ni), % 19 to 21
0 to 1.0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0