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Grade 21 Titanium vs. Grade 25 Titanium

Both grade 21 titanium and grade 25 titanium are titanium alloys. They have 82% of their average alloy composition in common. There are 28 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 grade 21 titanium and the bottom bar is grade 25 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
110
Elongation at Break, % 9.0 to 17
11
Fatigue Strength, MPa 550 to 660
550
Poisson's Ratio 0.32
0.32
Reduction in Area, % 22
29
Shear Modulus, GPa 51
40
Shear Strength, MPa 550 to 790
600
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
1000
Tensile Strength: Yield (Proof), MPa 870 to 1170
940

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 310
340
Melting Completion (Liquidus), °C 1740
1610
Melting Onset (Solidus), °C 1690
1560
Specific Heat Capacity, J/kg-K 500
560
Thermal Conductivity, W/m-K 7.5
7.1
Thermal Expansion, µm/m-K 7.1
9.6

Otherwise Unclassified Properties

Density, g/cm3 5.4
4.5
Embodied Carbon, kg CO2/kg material 32
43
Embodied Energy, MJ/kg 490
700
Embodied Water, L/kg 180
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
4220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
35
Strength to Weight: Axial, points 46 to 69
62
Strength to Weight: Bending, points 38 to 50
50
Thermal Diffusivity, mm2/s 2.8
2.8
Thermal Shock Resistance, points 66 to 100
71

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
5.5 to 6.8
Carbon (C), % 0 to 0.050
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.013
Iron (Fe), % 0 to 0.4
0 to 0.4
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
0.3 to 0.8
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0 to 0.17
0 to 0.2
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0.15 to 0.25
0
Titanium (Ti), % 76 to 81.2
86.7 to 90.6
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4