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R31539 Cobalt vs. R30075 Cobalt

Both R31539 cobalt and R30075 cobalt are cobalt alloys. Their average alloy composition is basically identical. There are 28 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210 to 250
Elongation at Break, % 13 to 22
12
Fatigue Strength, MPa 310 to 480
250 to 840
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
20
Shear Modulus, GPa 86
82 to 98
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
780 to 1280
Tensile Strength: Yield (Proof), MPa 590 to 940
480 to 840

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
12

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
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
560 to 1410
Stiffness to Weight: Axial, points 15
14 to 17
Stiffness to Weight: Bending, points 24
24 to 25
Strength to Weight: Axial, points 33 to 44
26 to 42
Strength to Weight: Bending, points 27 to 32
22 to 31
Thermal Diffusivity, mm2/s 3.5
3.5
Thermal Shock Resistance, points 24 to 32
21 to 29

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.14
0 to 0.35
Chromium (Cr), % 26 to 30
27 to 30
Cobalt (Co), % 57.7 to 68.7
58.7 to 68
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 0.5
Nitrogen (N), % 0 to 0.25
0 to 0.25
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2

Comparable Variants