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Grade 6 Titanium vs. SAE-AISI 4340 Steel

Grade 6 titanium belongs to the titanium alloys classification, while SAE-AISI 4340 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 6 titanium and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
190
Elongation at Break, % 11
12 to 22
Fatigue Strength, MPa 290
330 to 740
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 39
73
Shear Strength, MPa 530
430 to 770
Tensile Strength: Ultimate (UTS), MPa 890
690 to 1280
Tensile Strength: Yield (Proof), MPa 840
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 310
430
Melting Completion (Liquidus), °C 1580
1460
Melting Onset (Solidus), °C 1530
1420
Specific Heat Capacity, J/kg-K 550
470
Thermal Conductivity, W/m-K 7.8
44
Thermal Expansion, µm/m-K 9.4
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 36
3.5
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 30
1.7
Embodied Energy, MJ/kg 480
22
Embodied Water, L/kg 190
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 3390
590 to 3490
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 55
24 to 45
Strength to Weight: Bending, points 46
22 to 33
Thermal Diffusivity, mm2/s 3.2
12
Thermal Shock Resistance, points 65
20 to 38

Alloy Composition

Aluminum (Al), % 4.0 to 6.0
0
Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 0.9
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.5
95.1 to 96.3
Manganese (Mn), % 0
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.2
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tin (Sn), % 2.0 to 3.0
0
Titanium (Ti), % 89.8 to 94
0
Residuals, % 0 to 0.4
0