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AWS ERTi-1 vs. R30816 Cobalt

AWS ERTi-1 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-1 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 24
23
Fatigue Strength, MPa 120
250
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 41
81
Tensile Strength: Ultimate (UTS), MPa 240
1020
Tensile Strength: Yield (Proof), MPa 170
460

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Melting Completion (Liquidus), °C 1670
1540
Melting Onset (Solidus), °C 1620
1460
Specific Heat Capacity, J/kg-K 540
420
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 8.7
12

Otherwise Unclassified Properties

Density, g/cm3 4.5
9.1
Embodied Carbon, kg CO2/kg material 31
20
Embodied Energy, MJ/kg 510
320
Embodied Water, L/kg 110
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
190
Resilience: Unit (Modulus of Resilience), kJ/m3 140
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
22
Strength to Weight: Axial, points 15
31
Strength to Weight: Bending, points 19
25
Thermal Diffusivity, mm2/s 8.7
3.3
Thermal Shock Resistance, points 19
28

Alloy Composition

Carbon (C), % 0 to 0.030
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.080
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 0.012
0
Oxygen (O), % 0.030 to 0.1
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), % 99.773 to 99.97
0
Tungsten (W), % 0
3.5 to 4.5