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SAE-AISI 8740 Steel vs. R56406 Titanium

SAE-AISI 8740 steel belongs to the iron alloys classification, while R56406 titanium belongs to the titanium alloys. There are 29 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 SAE-AISI 8740 steel and the bottom bar is R56406 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 11 to 23
9.1
Fatigue Strength, MPa 270 to 350
480
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
40
Tensile Strength: Ultimate (UTS), MPa 580 to 670
980
Tensile Strength: Yield (Proof), MPa 380 to 570
850

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 410
340
Melting Completion (Liquidus), °C 1460
1610
Melting Onset (Solidus), °C 1420
1560
Specific Heat Capacity, J/kg-K 470
560
Thermal Conductivity, W/m-K 39
7.1
Thermal Expansion, µm/m-K 13
9.6

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.5
38
Embodied Energy, MJ/kg 20
610
Embodied Water, L/kg 50
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
85
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
3420
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 20 to 24
61
Strength to Weight: Bending, points 20 to 22
49
Thermal Diffusivity, mm2/s 10
2.8
Thermal Shock Resistance, points 17 to 20
69

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.4 to 0.6
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 96.5 to 97.7
0 to 0.3
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
88.1 to 91
Vanadium (V), % 0
3.5 to 4.5