Grade 38 Titanium vs. SAE-AISI 1140 Steel
Grade 38 titanium belongs to the titanium alloys classification, while SAE-AISI 1140 steel belongs to the iron 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 grade 38 titanium and the bottom bar is SAE-AISI 1140 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 190 |
| Elongation at Break, % | 11 | |
| 14 to 18 |
| Fatigue Strength, MPa | 530 | |
| 230 to 370 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Reduction in Area, % | 29 | |
| 39 to 46 |
| Shear Modulus, GPa | 40 | |
| 72 |
| Shear Strength, MPa | 600 | |
| 370 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 | |
| 600 to 700 |
| Tensile Strength: Yield (Proof), MPa | 910 | |
| 340 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 400 |
| Melting Completion (Liquidus), °C | 1620 | |
| 1460 |
| Melting Onset (Solidus), °C | 1570 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 470 |
| Thermal Conductivity, W/m-K | 8.0 | |
| 51 |
| Thermal Expansion, µm/m-K | 9.3 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.2 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.4 | |
| 8.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 36 | |
| 1.8 |
| Density, g/cm3 | 4.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 35 | |
| 1.4 |
| Embodied Energy, MJ/kg | 560 | |
| 18 |
| Embodied Water, L/kg | 160 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 | |
| 89 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3840 | |
| 310 to 870 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 24 |
| Strength to Weight: Axial, points | 62 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 49 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 14 |
| Thermal Shock Resistance, points | 72 | |
| 18 to 21 |
Alloy Composition
| Aluminum (Al), % | 3.5 to 4.5 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 0.37 to 0.44 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 1.2 to 1.8 | |
| 98.4 to 98.9 |
| Manganese (Mn), % | 0 | |
| 0.7 to 1.0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0.2 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Sulfur (S), % | 0 | |
| 0.080 to 0.13 |
| Titanium (Ti), % | 89.9 to 93.1 | |
| 0 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |