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R30021 Cobalt vs. AWS ERTi-2

R30021 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 R30021 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, % 9.0
20
Fatigue Strength, MPa 250
190
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 700
340
Tensile Strength: Yield (Proof), MPa 500
280

Thermal Properties

Latent Heat of Fusion, J/g 330
420
Melting Completion (Liquidus), °C 1350
1670
Melting Onset (Solidus), °C 1190
1620
Specific Heat Capacity, J/kg-K 450
540
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 11
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
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 8.0
31
Embodied Energy, MJ/kg 110
510
Embodied Water, L/kg 520
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
64
Resilience: Unit (Modulus of Resilience), kJ/m3 570
360
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23
21
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 3.8
8.7
Thermal Shock Resistance, points 21
27

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.030
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Hydrogen (H), % 0
0 to 0.0080
Iron (Fe), % 0 to 3.0
0 to 0.12
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0
0 to 0.015
Oxygen (O), % 0
0.080 to 0.16
Silicon (Si), % 0 to 1.5
0
Titanium (Ti), % 0
99.667 to 99.92