Grade 21 Titanium vs. AISI 204 Stainless Steel
Grade 21 titanium belongs to the titanium alloys classification, while AISI 204 stainless steel belongs to the iron alloys. There are 28 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 204 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 200 |
| Elongation at Break, % | 9.0 to 17 | |
| 23 to 39 |
| Fatigue Strength, MPa | 550 to 660 | |
| 320 to 720 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 51 | |
| 77 |
| Shear Strength, MPa | 550 to 790 | |
| 500 to 700 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 730 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 380 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 850 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1410 |
| Melting Onset (Solidus), °C | 1690 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 480 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 15 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 10 |
| Density, g/cm3 | 5.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 2.4 |
| Embodied Energy, MJ/kg | 490 | |
| 35 |
| Embodied Water, L/kg | 180 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 240 to 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 360 to 2940 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 32 | |
| 25 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 27 to 40 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 24 to 31 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 4.1 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 16 to 24 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 | |
| 15 to 17 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 69.6 to 76.4 |
| Manganese (Mn), % | 0 | |
| 7.0 to 9.0 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 1.5 to 3.0 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0.15 to 0.3 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |