ASTM A204 Steel vs. Grade 21 Titanium
ASTM A204 steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is ASTM A204 steel and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 140 |
| Elongation at Break, % | 18 to 22 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 200 to 220 | |
| 550 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 73 | |
| 51 |
| Shear Strength, MPa | 330 to 360 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 590 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 290 to 330 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 310 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1740 |
| Melting Onset (Solidus), °C | 1420 to 1430 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 500 |
| Thermal Conductivity, W/m-K | 52 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 13 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 60 |
| Density, g/cm3 | 7.9 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 32 |
| Embodied Energy, MJ/kg | 20 | |
| 490 |
| Embodied Water, L/kg | 47 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 90 to 95 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 220 to 290 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 32 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 14 | |
| 2.8 |
| Thermal Shock Resistance, points | 15 to 17 | |
| 66 to 100 |