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R30075 Cobalt vs. R31538 Cobalt

Both R30075 cobalt and R31538 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 R30075 cobalt and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
220
Elongation at Break, % 12
13 to 23
Fatigue Strength, MPa 250 to 840
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 20
13 to 22
Shear Modulus, GPa 82 to 98
86
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
1020 to 1360
Tensile Strength: Yield (Proof), MPa 480 to 840
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 12
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 8.1
8.1
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
750 to 1920
Stiffness to Weight: Axial, points 14 to 17
15
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
34 to 45
Strength to Weight: Bending, points 22 to 31
27 to 32
Thermal Diffusivity, mm2/s 3.5
3.5
Thermal Shock Resistance, points 21 to 29
25 to 33

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.15 to 0.35
Chromium (Cr), % 27 to 30
26 to 30
Cobalt (Co), % 58.7 to 68
58.7 to 68.9
Iron (Fe), % 0 to 0.75
0 to 0.75
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 0.5
0 to 1.0
Nitrogen (N), % 0 to 0.25
0 to 0.25
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0

Comparable Variants