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AWS ERTi-7 vs. R30021 Cobalt

AWS ERTi-7 belongs to the titanium alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AWS ERTi-7 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 20
9.0
Fatigue Strength, MPa 190
250
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 340
700
Tensile Strength: Yield (Proof), MPa 280
500

Thermal Properties

Latent Heat of Fusion, J/g 420
330
Melting Completion (Liquidus), °C 1670
1350
Melting Onset (Solidus), °C 1620
1190
Specific Heat Capacity, J/kg-K 540
450
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 8.7
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 47
8.0
Embodied Energy, MJ/kg 800
110
Embodied Water, L/kg 470
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
57
Resilience: Unit (Modulus of Resilience), kJ/m3 360
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 21
23
Strength to Weight: Bending, points 24
21
Thermal Diffusivity, mm2/s 8.8
3.8
Thermal Shock Resistance, points 26
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
0 to 3.0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 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 1.5
Titanium (Ti), % 99.417 to 99.8
0