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R31539 Cobalt vs. AWS ERTi-2

R31539 cobalt belongs to the cobalt alloys classification, while AWS ERTi-2 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 R31539 cobalt and the bottom bar is AWS ERTi-2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 22
20
Fatigue Strength, MPa 310 to 480
190
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
340
Tensile Strength: Yield (Proof), MPa 590 to 940
280

Thermal Properties

Latent Heat of Fusion, J/g 320
420
Melting Completion (Liquidus), °C 1360
1670
Melting Onset (Solidus), °C 1290
1620
Specific Heat Capacity, J/kg-K 450
540
Thermal Conductivity, W/m-K 13
21
Thermal Expansion, µm/m-K 13
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
7.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.5
Embodied Carbon, kg CO2/kg material 8.2
31
Embodied Energy, MJ/kg 110
510
Embodied Water, L/kg 530
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
64
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
360
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 33 to 44
21
Strength to Weight: Bending, points 27 to 32
24
Thermal Diffusivity, mm2/s 3.5
8.7
Thermal Shock Resistance, points 24 to 32
27

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Hydrogen (H), % 0
0 to 0.0080
Iron (Fe), % 0 to 0.75
0 to 0.12
Lanthanum (La), % 0.030 to 0.2
0
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 0.015
Oxygen (O), % 0
0.080 to 0.16
Silicon (Si), % 0 to 1.0
0
Titanium (Ti), % 0
99.667 to 99.92