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R31539 Cobalt vs. R31538 Cobalt

Both R31539 cobalt and R31538 cobalt are cobalt alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 13 to 22
13 to 23
Fatigue Strength, MPa 310 to 480
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
13 to 22
Rockwell C Hardness 25 to 35
25 to 35
Shear Modulus, GPa 86
86
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1020 to 1360
Tensile Strength: Yield (Proof), MPa 590 to 940
580 to 930

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
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 8.2
8.1
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
750 to 1920
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
34 to 45
Strength to Weight: Bending, points 27 to 32
27 to 32
Thermal Diffusivity, mm2/s 3.5
3.5
Thermal Shock Resistance, points 24 to 32
25 to 33

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.15 to 0.35
Chromium (Cr), % 26 to 30
26 to 30
Cobalt (Co), % 57.7 to 68.7
58.7 to 68.9
Iron (Fe), % 0 to 0.75
0 to 0.75
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
5.0 to 7.0
Nickel (Ni), % 0 to 1.0
0 to 1.0
Nitrogen (N), % 0 to 0.25
0 to 0.25
Silicon (Si), % 0 to 1.0
0 to 1.0

Comparable Variants