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G-CoCr28 Cobalt vs. Grade 38 Titanium

G-CoCr28 cobalt belongs to the cobalt alloys classification, while grade 38 titanium belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is grade 38 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
110
Elongation at Break, % 6.7
11
Fatigue Strength, MPa 130
530
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 83
40
Tensile Strength: Ultimate (UTS), MPa 560
1000
Tensile Strength: Yield (Proof), MPa 260
910

Thermal Properties

Latent Heat of Fusion, J/g 320
410
Maximum Temperature: Mechanical, °C 1200
330
Melting Completion (Liquidus), °C 1330
1620
Melting Onset (Solidus), °C 1270
1570
Specific Heat Capacity, J/kg-K 470
550
Thermal Conductivity, W/m-K 8.5
8.0
Thermal Expansion, µm/m-K 14
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 100
36
Density, g/cm3 8.1
4.5
Embodied Carbon, kg CO2/kg material 6.2
35
Embodied Energy, MJ/kg 84
560
Embodied Water, L/kg 440
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
3840
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 19
62
Strength to Weight: Bending, points 19
49
Thermal Diffusivity, mm2/s 2.2
3.2
Thermal Shock Resistance, points 14
72

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.5
Carbon (C), % 0.050 to 0.25
0 to 0.080
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 48 to 52
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 9.7 to 24.5
1.2 to 1.8
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
0
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.5 to 1.5
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
89.9 to 93.1
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4