Grade 21 Titanium vs. EN 1.4477 Stainless Steel
Grade 21 titanium belongs to the titanium alloys classification, while EN 1.4477 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is grade 21 titanium and the bottom bar is EN 1.4477 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 210 |
| Elongation at Break, % | 9.0 to 17 | |
| 22 to 23 |
| Fatigue Strength, MPa | 550 to 660 | |
| 420 to 490 |
| Poisson's Ratio | 0.32 | |
| 0.27 |
| Shear Modulus, GPa | 51 | |
| 81 |
| Shear Strength, MPa | 550 to 790 | |
| 550 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 880 to 930 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 620 to 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1430 |
| Melting Onset (Solidus), °C | 1690 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 480 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 13 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 20 |
| Density, g/cm3 | 5.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 3.7 |
| Embodied Energy, MJ/kg | 490 | |
| 52 |
| Embodied Water, L/kg | 180 | |
| 190 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 180 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 940 to 1290 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 32 | |
| 25 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 31 to 33 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 26 to 27 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 3.5 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 23 to 25 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 | |
| 28 to 30 |
| Copper (Cu), % | 0 | |
| 0 to 0.8 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 56.6 to 63.6 |
| Manganese (Mn), % | 0 | |
| 0.8 to 1.5 |
| Molybdenum (Mo), % | 14 to 16 | |
| 1.5 to 2.6 |
| Nickel (Ni), % | 0 | |
| 5.8 to 7.5 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0.3 to 0.4 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |