Grade 21 Titanium vs. AISI 403 Stainless Steel
Grade 21 titanium belongs to the titanium alloys classification, while AISI 403 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is grade 21 titanium and the bottom bar is AISI 403 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 190 |
| Elongation at Break, % | 9.0 to 17 | |
| 16 to 25 |
| Fatigue Strength, MPa | 550 to 660 | |
| 200 to 340 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Reduction in Area, % | 22 | |
| 47 to 50 |
| Shear Modulus, GPa | 51 | |
| 76 |
| Shear Strength, MPa | 550 to 790 | |
| 340 to 480 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 530 to 780 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 280 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 740 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1450 |
| Melting Onset (Solidus), °C | 1690 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 480 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 28 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 9.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 6.5 |
| Density, g/cm3 | 5.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 1.9 |
| Embodied Energy, MJ/kg | 490 | |
| 27 |
| Embodied Water, L/kg | 180 | |
| 99 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 110 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 210 to 840 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 32 | |
| 25 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 19 to 28 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 19 to 24 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 7.6 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 20 to 29 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 11.5 to 13 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 84.7 to 88.5 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 0 to 0.6 |
| 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 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |