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AWS ERTi-12 vs. R31538 Cobalt

AWS ERTi-12 belongs to the titanium alloys classification, while R31538 cobalt belongs to the cobalt 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 AWS ERTi-12 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 12
13 to 23
Fatigue Strength, MPa 200
310 to 480
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 41
86
Tensile Strength: Ultimate (UTS), MPa 480
1020 to 1360
Tensile Strength: Yield (Proof), MPa 340
580 to 930

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 31
8.1
Embodied Energy, MJ/kg 510
110
Embodied Water, L/kg 110
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 550
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 30
34 to 45
Strength to Weight: Bending, points 30
27 to 32
Thermal Diffusivity, mm2/s 8.7
3.5
Thermal Shock Resistance, points 37
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.030
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.15
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.4
5.0 to 7.0
Nickel (Ni), % 0.060 to 0.090
0 to 1.0
Nitrogen (N), % 0 to 0.015
0 to 0.25
Oxygen (O), % 0.080 to 0.16
0
Silicon (Si), % 0
0 to 1.0
Titanium (Ti), % 99.147 to 99.66
0