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Grade 29 Titanium vs. SAE-AISI 8660 Steel

Grade 29 titanium belongs to the titanium alloys classification, while SAE-AISI 8660 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 29 titanium and the bottom bar is SAE-AISI 8660 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 6.8 to 11
12
Fatigue Strength, MPa 460 to 510
340
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
73
Shear Strength, MPa 550 to 560
390
Tensile Strength: Ultimate (UTS), MPa 930 to 940
660
Tensile Strength: Yield (Proof), MPa 850 to 870
550

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 340
410
Melting Completion (Liquidus), °C 1610
1450
Melting Onset (Solidus), °C 1560
1410
Specific Heat Capacity, J/kg-K 560
470
Thermal Conductivity, W/m-K 7.3
39
Thermal Expansion, µm/m-K 9.3
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 36
2.6
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 39
1.5
Embodied Energy, MJ/kg 640
20
Embodied Water, L/kg 410
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 62 to 100
73
Resilience: Unit (Modulus of Resilience), kJ/m3 3420 to 3540
800
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 58 to 59
23
Strength to Weight: Bending, points 47 to 48
21
Thermal Diffusivity, mm2/s 2.9
10
Thermal Shock Resistance, points 68 to 69
19

Alloy Composition

Aluminum (Al), % 5.5 to 6.5
0
Carbon (C), % 0 to 0.080
0.56 to 0.64
Chromium (Cr), % 0
0.4 to 0.6
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
96.4 to 97.6
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.13
0
Phosphorus (P), % 0
0 to 0.035
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 88 to 90.9
0
Vanadium (V), % 3.5 to 4.5
0
Residuals, % 0 to 0.4
0