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Grade 21 Titanium vs. ASTM F15 Fe-Ni-Co

Grade 21 titanium belongs to the titanium alloys classification, while ASTM F15 Fe-Ni-Co belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is ASTM F15 Fe-Ni-Co.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
190
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 51
73
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
520 to 880

Thermal Properties

Latent Heat of Fusion, J/g 410
270
Melting Completion (Liquidus), °C 1740
1410
Melting Onset (Solidus), °C 1690
1450
Specific Heat Capacity, J/kg-K 500
460
Thermal Conductivity, W/m-K 7.5
17
Thermal Expansion, µm/m-K 7.1
6.0

Otherwise Unclassified Properties

Base Metal Price, % relative 60
49
Density, g/cm3 5.4
8.3
Embodied Carbon, kg CO2/kg material 32
5.2
Embodied Energy, MJ/kg 490
71
Embodied Water, L/kg 180
190

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
23
Strength to Weight: Axial, points 46 to 69
17 to 29
Strength to Weight: Bending, points 38 to 50
17 to 24
Thermal Diffusivity, mm2/s 2.8
4.5
Thermal Shock Resistance, points 66 to 100
32 to 55

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0 to 0.1
Carbon (C), % 0 to 0.050
0 to 0.040
Chromium (Cr), % 0
0 to 0.2
Cobalt (Co), % 0
16 to 18
Copper (Cu), % 0
0 to 0.2
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
50.3 to 56
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 14 to 16
0 to 0.2
Nickel (Ni), % 0
28 to 30
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0 to 0.2
Titanium (Ti), % 76 to 81.2
0 to 0.1
Zirconium (Zr), % 0
0 to 0.1
Residuals, % 0 to 0.4
0

Comparable Variants