Grade 18 Titanium vs. S13800 Stainless Steel
Grade 18 titanium belongs to the titanium alloys classification, while S13800 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is grade 18 titanium and the bottom bar is S13800 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 11 to 17 | |
| 11 to 18 |
| Fatigue Strength, MPa | 330 to 480 | |
| 410 to 870 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Reduction in Area, % | 23 | |
| 39 to 62 |
| Shear Modulus, GPa | 40 | |
| 77 |
| Shear Strength, MPa | 420 to 590 | |
| 610 to 1030 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 980 to 1730 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 660 to 1580 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 810 |
| Melting Completion (Liquidus), °C | 1640 | |
| 1450 |
| Melting Onset (Solidus), °C | 1590 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 470 |
| Thermal Conductivity, W/m-K | 8.3 | |
| 16 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.3 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 3.4 |
| Embodied Energy, MJ/kg | 670 | |
| 46 |
| Embodied Water, L/kg | 270 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 150 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1380 to 3110 | |
| 1090 to 5490 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 25 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 35 to 61 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 28 to 41 |
| Thermal Diffusivity, mm2/s | 3.4 | |
| 4.3 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 33 to 58 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0.9 to 1.4 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 | |
| 12.3 to 13.2 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.25 | |
| 73.6 to 77.3 |
| Manganese (Mn), % | 0 | |
| 0 to 0.2 |
| Molybdenum (Mo), % | 0 | |
| 2.0 to 3.0 |
| Nickel (Ni), % | 0 | |
| 7.5 to 8.5 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.010 |
| Oxygen (O), % | 0 to 0.15 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 | |
| 0 to 0.0080 |
| Titanium (Ti), % | 92.5 to 95.5 | |
| 0 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |