EN 1.1221 Steel vs. Grade 31 Titanium
EN 1.1221 steel belongs to the iron alloys classification, while grade 31 titanium belongs to the titanium 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 EN 1.1221 steel and the bottom bar is grade 31 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 110 |
| Elongation at Break, % | 10 to 21 | |
| 20 |
| Fatigue Strength, MPa | 240 to 340 | |
| 300 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 72 | |
| 41 |
| Shear Strength, MPa | 450 to 520 | |
| 320 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 870 | |
| 510 |
| Tensile Strength: Yield (Proof), MPa | 390 to 550 | |
| 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 320 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1660 |
| Melting Onset (Solidus), °C | 1410 | |
| 1610 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 540 |
| Thermal Conductivity, W/m-K | 48 | |
| 21 |
| Thermal Expansion, µm/m-K | 12 | |
| 8.7 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 3.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 6.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 36 |
| Embodied Energy, MJ/kg | 19 | |
| 600 |
| Embodied Water, L/kg | 47 | |
| 230 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 67 to 130 | |
| 99 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 410 to 800 | |
| 940 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 35 |
| Strength to Weight: Axial, points | 26 to 31 | |
| 32 |
| Strength to Weight: Bending, points | 23 to 26 | |
| 32 |
| Thermal Diffusivity, mm2/s | 13 | |
| 8.5 |
| Thermal Shock Resistance, points | 23 to 28 | |
| 39 |
Alloy Composition
| Carbon (C), % | 0.57 to 0.65 | |
| 0 to 0.080 |
| Chromium (Cr), % | 0 to 0.4 | |
| 0 |
| Cobalt (Co), % | 0 | |
| 0.2 to 0.8 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 97.1 to 98.8 | |
| 0 to 0.3 |
| Manganese (Mn), % | 0.6 to 0.9 | |
| 0 |
| Molybdenum (Mo), % | 0 to 0.1 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.050 |
| Oxygen (O), % | 0 | |
| 0 to 0.35 |
| Palladium (Pd), % | 0 | |
| 0.040 to 0.080 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 97.9 to 99.76 |
| Residuals, % | 0 | |
| 0 to 0.4 |