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AWS ERTi-7 vs. R30001 Cobalt

AWS ERTi-7 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 (7, in this case) are not shown.

For each property being compared, the top bar is AWS ERTi-7 and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 20
1.0
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 340
620

Thermal Properties

Latent Heat of Fusion, J/g 420
310
Melting Completion (Liquidus), °C 1670
1530
Melting Onset (Solidus), °C 1620
1260
Specific Heat Capacity, J/kg-K 540
430
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 8.7
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 4.5
9.0
Embodied Carbon, kg CO2/kg material 47
8.9
Embodied Energy, MJ/kg 800
130
Embodied Water, L/kg 470
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
22
Strength to Weight: Axial, points 21
19
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 8.8
3.7
Thermal Shock Resistance, points 26
19

Alloy Composition

Carbon (C), % 0 to 0.030
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Nitrogen (N), % 0 to 0.015
0
Oxygen (O), % 0.080 to 0.16
0
Palladium (Pd), % 0.12 to 0.25
0
Silicon (Si), % 0
0 to 2.0
Titanium (Ti), % 99.417 to 99.8
0
Tungsten (W), % 0
11 to 13