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Grade 21 Titanium vs. Grade 2 Titanium

Both grade 21 titanium and grade 2 titanium are titanium alloys. They have 79% of their average alloy composition in common. There are 29 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 grade 21 titanium and the bottom bar is grade 2 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
110
Elongation at Break, % 9.0 to 17
23
Fatigue Strength, MPa 550 to 660
250
Poisson's Ratio 0.32
0.32
Reduction in Area, % 22
37
Shear Modulus, GPa 51
38
Shear Strength, MPa 550 to 790
270
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
420
Tensile Strength: Yield (Proof), MPa 870 to 1170
360

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 310
320
Melting Completion (Liquidus), °C 1740
1660
Melting Onset (Solidus), °C 1690
1610
Specific Heat Capacity, J/kg-K 500
540
Thermal Conductivity, W/m-K 7.5
22
Thermal Expansion, µm/m-K 7.1
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 60
37
Density, g/cm3 5.4
4.5
Embodied Carbon, kg CO2/kg material 32
31
Embodied Energy, MJ/kg 490
510
Embodied Water, L/kg 180
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
92
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
600
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
35
Strength to Weight: Axial, points 46 to 69
26
Strength to Weight: Bending, points 38 to 50
28
Thermal Diffusivity, mm2/s 2.8
8.9
Thermal Shock Resistance, points 66 to 100
32

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.4
0 to 0.3
Molybdenum (Mo), % 14 to 16
0
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.17
0 to 0.25
Silicon (Si), % 0.15 to 0.25
0
Titanium (Ti), % 76 to 81.2
98.9 to 100
Residuals, % 0
0 to 0.4