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AWS ERTi-12 vs. R30016 Cobalt

AWS ERTi-12 belongs to the titanium alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS ERTi-12 and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 12
8.4
Fatigue Strength, MPa 200
290
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
85
Tensile Strength: Ultimate (UTS), MPa 480
1010
Tensile Strength: Yield (Proof), MPa 340
580

Thermal Properties

Latent Heat of Fusion, J/g 420
320
Melting Completion (Liquidus), °C 1670
1360
Melting Onset (Solidus), °C 1620
1270
Specific Heat Capacity, J/kg-K 540
450
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 8.7
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.5
Embodied Carbon, kg CO2/kg material 31
7.7
Embodied Energy, MJ/kg 510
110
Embodied Water, L/kg 110
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
72
Resilience: Unit (Modulus of Resilience), kJ/m3 550
770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 30
33
Strength to Weight: Bending, points 30
26
Thermal Diffusivity, mm2/s 8.7
3.9
Thermal Shock Resistance, points 37
24

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.15
0 to 3.0
Manganese (Mn), % 0
0.5 to 2.0
Molybdenum (Mo), % 0.2 to 0.4
0 to 1.5
Nickel (Ni), % 0.060 to 0.090
0 to 3.0
Nitrogen (N), % 0 to 0.015
0
Oxygen (O), % 0.080 to 0.16
0
Silicon (Si), % 0
0.2 to 2.0
Titanium (Ti), % 99.147 to 99.66
0
Tungsten (W), % 0
3.5 to 5.5