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AWS ERTi-5 vs. R30001 Cobalt

AWS ERTi-5 belongs to the titanium alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 10
1.0
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 900
620

Thermal Properties

Latent Heat of Fusion, J/g 410
310
Melting Completion (Liquidus), °C 1610
1530
Melting Onset (Solidus), °C 1560
1260
Specific Heat Capacity, J/kg-K 560
430
Thermal Conductivity, W/m-K 7.1
15
Thermal Expansion, µm/m-K 9.6
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
1.8

Otherwise Unclassified Properties

Density, g/cm3 4.4
9.0
Embodied Carbon, kg CO2/kg material 38
8.9
Embodied Energy, MJ/kg 610
130
Embodied Water, L/kg 200
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
22
Strength to Weight: Axial, points 56
19
Strength to Weight: Bending, points 46
18
Thermal Diffusivity, mm2/s 2.9
3.7
Thermal Shock Resistance, points 63
19

Alloy Composition

Aluminum (Al), % 5.5 to 6.8
0
Carbon (C), % 0 to 0.050
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.22
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0.12 to 0.2
0
Silicon (Si), % 0
0 to 2.0
Titanium (Ti), % 88.2 to 90.9
0
Tungsten (W), % 0
11 to 13
Vanadium (V), % 3.5 to 4.5
0