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Grade 21 Titanium vs. AWS BCo-1

Grade 21 titanium belongs to the titanium alloys classification, while AWS BCo-1 belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is AWS BCo-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
200
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 51
78
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
700

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Melting Completion (Liquidus), °C 1740
1150
Melting Onset (Solidus), °C 1690
1120
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 7.1
12

Otherwise Unclassified Properties

Density, g/cm3 5.4
8.1
Embodied Carbon, kg CO2/kg material 32
8.0
Embodied Energy, MJ/kg 490
110
Embodied Water, L/kg 180
430

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
24
Strength to Weight: Axial, points 46 to 69
24
Strength to Weight: Bending, points 38 to 50
22
Thermal Shock Resistance, points 66 to 100
21

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0 to 0.050
Boron (B), % 0
0.7 to 0.9
Carbon (C), % 0 to 0.050
0.35 to 0.45
Chromium (Cr), % 0
18 to 20
Cobalt (Co), % 0
46 to 54
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 1.0
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
16 to 18
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0.15 to 0.25
7.5 to 8.5
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 76 to 81.2
0 to 0.050
Tungsten (W), % 0
3.5 to 4.5
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0 to 0.4
0 to 0.5