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AWS ERTi-7 vs. R30035 Cobalt

AWS ERTi-7 belongs to the titanium alloys classification, while R30035 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220 to 230
Elongation at Break, % 20
9.0 to 46
Fatigue Strength, MPa 190
170 to 740
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
84 to 89
Tensile Strength: Ultimate (UTS), MPa 340
900 to 1900
Tensile Strength: Yield (Proof), MPa 280
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 420
320
Melting Completion (Liquidus), °C 1670
1440
Melting Onset (Solidus), °C 1620
1320
Specific Heat Capacity, J/kg-K 540
440
Thermal Conductivity, W/m-K 21
11
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.7
Embodied Carbon, kg CO2/kg material 47
10
Embodied Energy, MJ/kg 800
140
Embodied Water, L/kg 470
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 360
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 35
23 to 24
Strength to Weight: Axial, points 21
29 to 61
Strength to Weight: Bending, points 24
24 to 39
Thermal Diffusivity, mm2/s 8.8
3.0
Thermal Shock Resistance, points 26
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.030
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
0 to 1.0
Manganese (Mn), % 0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0
33 to 37
Nitrogen (N), % 0 to 0.015
0
Oxygen (O), % 0.080 to 0.16
0
Palladium (Pd), % 0.12 to 0.25
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 0.15
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 99.417 to 99.8
0 to 1.0