Grade 31 Titanium vs. ACI-ASTM CN7MS Steel
Grade 31 titanium belongs to the titanium alloys classification, while ACI-ASTM CN7MS steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is grade 31 titanium and the bottom bar is ACI-ASTM CN7MS steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 20 | |
| 39 |
| Fatigue Strength, MPa | 300 | |
| 200 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 41 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 510 | |
| 540 |
| Tensile Strength: Yield (Proof), MPa | 450 | |
| 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 340 |
| Maximum Temperature: Mechanical, °C | 320 | |
| 1040 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1400 |
| Melting Onset (Solidus), °C | 1610 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 480 |
| Thermal Conductivity, W/m-K | 21 | |
| 12 |
| Thermal Expansion, µm/m-K | 8.7 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 36 | |
| 5.1 |
| Embodied Energy, MJ/kg | 600 | |
| 71 |
| Embodied Water, L/kg | 230 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 99 | |
| 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 940 | |
| 140 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 25 |
| Strength to Weight: Axial, points | 32 | |
| 19 |
| Strength to Weight: Bending, points | 32 | |
| 19 |
| Thermal Diffusivity, mm2/s | 8.5 | |
| 3.2 |
| Thermal Shock Resistance, points | 39 | |
| 13 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.070 |
| Chromium (Cr), % | 0 | |
| 18 to 20 |
| Cobalt (Co), % | 0.2 to 0.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 1.5 to 2.0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 45.4 to 53.5 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 2.5 to 3.0 |
| Nickel (Ni), % | 0 | |
| 22 to 25 |
| Nitrogen (N), % | 0 to 0.050 | |
| 0 |
| Oxygen (O), % | 0 to 0.35 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 2.5 to 3.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 97.9 to 99.76 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |