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R31538 Cobalt vs. AWS ENiCrMo-10

R31538 cobalt belongs to the cobalt alloys classification, while AWS ENiCrMo-10 belongs to the nickel alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS ENiCrMo-10.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 13 to 23
28
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
84
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
710

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1550
Melting Onset (Solidus), °C 1290
1490
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 13
10
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.9
Embodied Carbon, kg CO2/kg material 8.1
12
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 530
300

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
22
Strength to Weight: Bending, points 27 to 32
20
Thermal Diffusivity, mm2/s 3.5
2.7
Thermal Shock Resistance, points 25 to 33
19

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0 to 0.020
Chromium (Cr), % 26 to 30
20 to 22.5
Cobalt (Co), % 58.7 to 68.9
0 to 2.5
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 0 to 0.75
2.0 to 6.0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
12.5 to 14.5
Nickel (Ni), % 0 to 1.0
48.4 to 63
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 0
0 to 0.35
Residuals, % 0
0 to 0.5