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AWS ERTi-7 vs. R30012 Cobalt

AWS ERTi-7 belongs to the titanium alloys classification, while R30012 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 R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 20
1.0
Fatigue Strength, MPa 190
320
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 340
830
Tensile Strength: Yield (Proof), MPa 280
650

Thermal Properties

Latent Heat of Fusion, J/g 420
320
Melting Completion (Liquidus), °C 1670
1470
Melting Onset (Solidus), °C 1620
1280
Specific Heat Capacity, J/kg-K 540
440
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 8.7
12

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
8.8
Embodied Carbon, kg CO2/kg material 47
8.3
Embodied Energy, MJ/kg 800
120
Embodied Water, L/kg 470
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 360
960
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
23
Strength to Weight: Axial, points 21
26
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 8.8
3.8
Thermal Shock Resistance, points 26
23

Alloy Composition

Carbon (C), % 0 to 0.030
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
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
7.5 to 9.5