Grade 21 Titanium vs. SAE-AISI 1045 Steel
Grade 21 titanium belongs to the titanium alloys classification, while SAE-AISI 1045 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 21 titanium and the bottom bar is SAE-AISI 1045 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 190 |
| Elongation at Break, % | 9.0 to 17 | |
| 13 to 18 |
| Fatigue Strength, MPa | 550 to 660 | |
| 220 to 370 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Reduction in Area, % | 22 | |
| 40 to 51 |
| Shear Modulus, GPa | 51 | |
| 72 |
| Shear Strength, MPa | 550 to 790 | |
| 380 to 410 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 620 to 680 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 330 to 580 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 400 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1460 |
| Melting Onset (Solidus), °C | 1690 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 470 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 51 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 1.8 |
| Density, g/cm3 | 5.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 1.4 |
| Embodied Energy, MJ/kg | 490 | |
| 18 |
| Embodied Water, L/kg | 180 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 84 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 300 to 900 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 24 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 22 to 24 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 21 to 22 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 14 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 20 to 22 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0.43 to 0.5 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 98.5 to 99 |
| Manganese (Mn), % | 0 | |
| 0.6 to 0.9 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.050 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |