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R30021 Cobalt vs. R31539 Cobalt

Both R30021 cobalt and R31539 cobalt are cobalt alloys. They have a very high 97% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 9.0
13 to 22
Fatigue Strength, MPa 250
310 to 480
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 32
25 to 35
Shear Modulus, GPa 86
86
Tensile Strength: Ultimate (UTS), MPa 700
1000 to 1340
Tensile Strength: Yield (Proof), MPa 500
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1350
1360
Melting Onset (Solidus), °C 1190
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.0
8.2
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 520
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 570
780 to 2000
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
33 to 44
Strength to Weight: Bending, points 21
27 to 32
Thermal Diffusivity, mm2/s 3.8
3.5
Thermal Shock Resistance, points 21
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0.2 to 0.35
0 to 0.14
Chromium (Cr), % 26 to 29
26 to 30
Cobalt (Co), % 61.7 to 67.3
57.7 to 68.7
Iron (Fe), % 0 to 3.0
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
5.0 to 7.0
Nickel (Ni), % 2.0 to 3.0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 1.5
0 to 1.0