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Grade 21 Titanium vs. ASTM A369 Grade FP91

Grade 21 titanium belongs to the titanium alloys classification, while ASTM A369 grade FP91 belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
190
Elongation at Break, % 9.0 to 17
19
Fatigue Strength, MPa 550 to 660
320
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 51
75
Shear Strength, MPa 550 to 790
410
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
670
Tensile Strength: Yield (Proof), MPa 870 to 1170
460

Thermal Properties

Latent Heat of Fusion, J/g 410
270
Maximum Temperature: Mechanical, °C 310
600
Melting Completion (Liquidus), °C 1740
1460
Melting Onset (Solidus), °C 1690
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Conductivity, W/m-K 7.5
26
Thermal Expansion, µm/m-K 7.1
13

Otherwise Unclassified Properties

Base Metal Price, % relative 60
7.0
Density, g/cm3 5.4
7.8
Embodied Carbon, kg CO2/kg material 32
2.6
Embodied Energy, MJ/kg 490
37
Embodied Water, L/kg 180
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
560
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
25
Strength to Weight: Axial, points 46 to 69
24
Strength to Weight: Bending, points 38 to 50
22
Thermal Diffusivity, mm2/s 2.8
6.9
Thermal Shock Resistance, points 66 to 100
18

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0 to 0.020
Carbon (C), % 0 to 0.050
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
87.3 to 90.3
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 14 to 16
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 2.2 to 3.2
0.060 to 0.1
Nitrogen (N), % 0 to 0.030
0.030 to 0.070
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0.15 to 0.25
0.2 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 76 to 81.2
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.4
0