Grade 18 Titanium vs. ASTM A302 Alloy Steel
Grade 18 titanium belongs to the titanium alloys classification, while ASTM A302 alloy steel belongs to the iron 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 grade 18 titanium and the bottom bar is ASTM A302 alloy steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 20 to 23 |
| Fatigue Strength, MPa | 330 to 480 | |
| 250 to 280 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 40 | |
| 73 |
| Shear Strength, MPa | 420 to 590 | |
| 370 to 390 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 590 to 620 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 350 to 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 410 |
| Melting Completion (Liquidus), °C | 1640 | |
| 1460 |
| Melting Onset (Solidus), °C | 1590 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 470 |
| Thermal Conductivity, W/m-K | 8.3 | |
| 39 to 51 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.3 | |
| 7.2 to 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 8.2 to 8.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.8 to 7.9 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 1.5 to 1.6 |
| Embodied Energy, MJ/kg | 670 | |
| 20 to 21 |
| Embodied Water, L/kg | 270 | |
| 48 to 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 110 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1380 to 3110 | |
| 330 to 410 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 24 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 21 to 22 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 20 to 21 |
| Thermal Diffusivity, mm2/s | 3.4 | |
| 10 to 14 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 17 to 18 |