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SAE-AISI 1140 Steel vs. Grade 38 Titanium

SAE-AISI 1140 steel belongs to the iron alloys classification, while grade 38 titanium belongs to the titanium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is grade 38 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 14 to 18
11
Fatigue Strength, MPa 230 to 370
530
Poisson's Ratio 0.29
0.32
Reduction in Area, % 39 to 46
29
Shear Modulus, GPa 72
40
Shear Strength, MPa 370 to 420
600
Tensile Strength: Ultimate (UTS), MPa 600 to 700
1000
Tensile Strength: Yield (Proof), MPa 340 to 570
910

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 400
330
Melting Completion (Liquidus), °C 1460
1620
Melting Onset (Solidus), °C 1420
1570
Specific Heat Capacity, J/kg-K 470
550
Thermal Conductivity, W/m-K 51
8.0
Thermal Expansion, µm/m-K 13
9.3

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
1.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.4
35
Embodied Energy, MJ/kg 18
560
Embodied Water, L/kg 46
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
110
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
3840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 21 to 25
62
Strength to Weight: Bending, points 20 to 22
49
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 18 to 21
72

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.5
Carbon (C), % 0.37 to 0.44
0 to 0.080
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 98.4 to 98.9
1.2 to 1.8
Manganese (Mn), % 0.7 to 1.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.040
0
Sulfur (S), % 0.080 to 0.13
0
Titanium (Ti), % 0
89.9 to 93.1
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4