Titanium 6-6-2 vs. ASTM A387 Grade 21 Steel
Titanium 6-6-2 belongs to the titanium alloys classification, while ASTM A387 grade 21 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is titanium 6-6-2 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, % | 6.7 to 9.0 | |
| 21 |
| Fatigue Strength, MPa | 590 to 670 | |
| 160 to 250 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 44 | |
| 74 |
| Shear Strength, MPa | 670 to 800 | |
| 310 to 370 |
| Tensile Strength: Ultimate (UTS), MPa | 1140 to 1370 | |
| 500 to 590 |
| Tensile Strength: Yield (Proof), MPa | 1040 to 1230 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 480 |
| Melting Completion (Liquidus), °C | 1610 | |
| 1470 |
| Melting Onset (Solidus), °C | 1560 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 470 |
| Thermal Conductivity, W/m-K | 5.5 | |
| 41 |
| Thermal Expansion, µm/m-K | 9.4 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.1 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 40 | |
| 4.1 |
| Density, g/cm3 | 4.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 29 | |
| 1.8 |
| Embodied Energy, MJ/kg | 470 | |
| 23 |
| Embodied Water, L/kg | 200 | |
| 62 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 89 to 99 | |
| 84 to 110 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 34 | |
| 24 |
| Strength to Weight: Axial, points | 66 to 79 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 50 to 57 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 2.1 | |
| 11 |
| Thermal Shock Resistance, points | 75 to 90 | |
| 14 to 17 |
Alloy Composition
| Aluminum (Al), % | 5.0 to 6.0 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 0 | |
| 2.8 to 3.3 |
| Copper (Cu), % | 0.35 to 1.0 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0.35 to 1.0 | |
| 94.4 to 96 |
| Manganese (Mn), % | 0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 5.0 to 6.0 | |
| 0.9 to 1.1 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 |
| Oxygen (O), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.025 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.8 to 87.8 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |