Grade 7 Titanium vs. S31727 Stainless Steel
Grade 7 titanium belongs to the titanium alloys classification, while S31727 stainless steel belongs to the iron alloys. There are 27 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 7 titanium and the bottom bar is S31727 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 24 | |
| 40 |
| Fatigue Strength, MPa | 250 | |
| 240 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Reduction in Area, % | 34 | |
| 56 |
| Shear Modulus, GPa | 38 | |
| 78 |
| Shear Strength, MPa | 270 | |
| 430 |
| Tensile Strength: Ultimate (UTS), MPa | 420 | |
| 630 |
| Tensile Strength: Yield (Proof), MPa | 340 | |
| 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 320 | |
| 1010 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1440 |
| Melting Onset (Solidus), °C | 1610 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 470 |
| Thermal Expansion, µm/m-K | 9.2 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 47 | |
| 4.7 |
| Embodied Energy, MJ/kg | 800 | |
| 64 |
| Embodied Water, L/kg | 470 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 95 | |
| 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 | |
| 190 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 24 |
| Strength to Weight: Axial, points | 26 | |
| 22 |
| Strength to Weight: Bending, points | 28 | |
| 20 |
| Thermal Shock Resistance, points | 31 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 | |
| 17.5 to 19 |
| Copper (Cu), % | 0 | |
| 2.8 to 4.0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 53.7 to 61.3 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 3.8 to 4.5 |
| Nickel (Ni), % | 0 | |
| 14.5 to 16.5 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0.15 to 0.21 |
| Oxygen (O), % | 0 to 0.25 | |
| 0 |
| Palladium (Pd), % | 0.12 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 98.7 to 99.88 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |