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AWS ERTi-2 vs. R30605 Cobalt

AWS ERTi-2 belongs to the titanium alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (4, 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-2 and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 20
34
Fatigue Strength, MPa 190
260 to 590
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
81
Tensile Strength: Ultimate (UTS), MPa 340
1130 to 1900
Tensile Strength: Yield (Proof), MPa 280
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Melting Completion (Liquidus), °C 1670
1410
Melting Onset (Solidus), °C 1620
1330
Specific Heat Capacity, J/kg-K 540
410
Thermal Conductivity, W/m-K 21
9.6
Thermal Expansion, µm/m-K 8.7
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
1.8

Otherwise Unclassified Properties

Density, g/cm3 4.5
9.6
Embodied Carbon, kg CO2/kg material 31
9.8
Embodied Energy, MJ/kg 510
140
Embodied Water, L/kg 110
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 35
21
Strength to Weight: Axial, points 21
33 to 55
Strength to Weight: Bending, points 24
25 to 36
Thermal Diffusivity, mm2/s 8.7
2.5
Thermal Shock Resistance, points 27
31 to 52

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
0 to 3.0
Manganese (Mn), % 0
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Nitrogen (N), % 0 to 0.015
0
Oxygen (O), % 0.080 to 0.16
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99.667 to 99.92
0
Tungsten (W), % 0
14 to 16