Grade 19 Titanium vs. ASTM A387 Grade 21 Steel
Grade 19 titanium belongs to the titanium alloys classification, while ASTM A387 grade 21 steel belongs to the iron alloys. There are 28 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 19 titanium and the bottom bar is ASTM A387 grade 21 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 190 |
| Elongation at Break, % | 5.6 to 17 | |
| 21 |
| Fatigue Strength, MPa | 550 to 620 | |
| 160 to 250 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 47 | |
| 74 |
| Shear Strength, MPa | 550 to 750 | |
| 310 to 370 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1300 | |
| 500 to 590 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 370 | |
| 480 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1470 |
| Melting Onset (Solidus), °C | 1600 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 520 | |
| 470 |
| Thermal Conductivity, W/m-K | 6.2 | |
| 41 |
| Thermal Expansion, µm/m-K | 9.1 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 45 | |
| 4.1 |
| Density, g/cm3 | 5.0 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 47 | |
| 1.8 |
| Embodied Energy, MJ/kg | 760 | |
| 23 |
| Embodied Water, L/kg | 230 | |
| 62 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 70 to 150 | |
| 84 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3040 to 5530 | |
| 140 to 320 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 33 | |
| 24 |
| Strength to Weight: Axial, points | 49 to 72 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 41 to 53 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 2.4 | |
| 11 |
| Thermal Shock Resistance, points | 57 to 83 | |
| 14 to 17 |
Alloy Composition
| Aluminum (Al), % | 3.0 to 4.0 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 5.5 to 6.5 | |
| 2.8 to 3.3 |
| Hydrogen (H), % | 0 to 0.020 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 94.4 to 96 |
| Manganese (Mn), % | 0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0.9 to 1.1 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.12 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.025 |
| Titanium (Ti), % | 71.1 to 77 | |
| 0 |
| Vanadium (V), % | 7.5 to 8.5 | |
| 0 |
| Zirconium (Zr), % | 3.5 to 4.5 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |