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R31538 Cobalt vs. AWS ERTi-5

R31538 cobalt belongs to the cobalt alloys classification, while AWS ERTi-5 belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS ERTi-5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 23
10
Fatigue Strength, MPa 310 to 480
470
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
900
Tensile Strength: Yield (Proof), MPa 580 to 930
830

Thermal Properties

Latent Heat of Fusion, J/g 320
410
Melting Completion (Liquidus), °C 1360
1610
Melting Onset (Solidus), °C 1290
1560
Specific Heat Capacity, J/kg-K 450
560
Thermal Conductivity, W/m-K 13
7.1
Thermal Expansion, µm/m-K 13
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.4
Embodied Carbon, kg CO2/kg material 8.1
38
Embodied Energy, MJ/kg 110
610
Embodied Water, L/kg 530
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
87
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
3250
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 34 to 45
56
Strength to Weight: Bending, points 27 to 32
46
Thermal Diffusivity, mm2/s 3.5
2.9
Thermal Shock Resistance, points 25 to 33
63

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.75
0 to 0.22
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0 to 0.030
Oxygen (O), % 0
0.12 to 0.2
Silicon (Si), % 0 to 1.0
0
Titanium (Ti), % 0
88.2 to 90.9
Vanadium (V), % 0
3.5 to 4.5