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AWS ERTi-5 vs. R30816 Cobalt

AWS ERTi-5 belongs to the titanium alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AWS ERTi-5 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 10
23
Fatigue Strength, MPa 470
250
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 40
81
Tensile Strength: Ultimate (UTS), MPa 900
1020
Tensile Strength: Yield (Proof), MPa 830
460

Thermal Properties

Latent Heat of Fusion, J/g 410
300
Melting Completion (Liquidus), °C 1610
1540
Melting Onset (Solidus), °C 1560
1460
Specific Heat Capacity, J/kg-K 560
420
Thermal Conductivity, W/m-K 7.1
13
Thermal Expansion, µm/m-K 9.6
12

Otherwise Unclassified Properties

Density, g/cm3 4.4
9.1
Embodied Carbon, kg CO2/kg material 38
20
Embodied Energy, MJ/kg 610
320
Embodied Water, L/kg 200
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87
190
Resilience: Unit (Modulus of Resilience), kJ/m3 3250
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
22
Strength to Weight: Axial, points 56
31
Strength to Weight: Bending, points 46
25
Thermal Diffusivity, mm2/s 2.9
3.3
Thermal Shock Resistance, points 63
28

Alloy Composition

Aluminum (Al), % 5.5 to 6.8
0
Carbon (C), % 0 to 0.050
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.22
0 to 5.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0.12 to 0.2
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 88.2 to 90.9
0
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 3.5 to 4.5
0