ASTM A217 Cast Steel vs. Grade 21 Titanium
ASTM A217 cast 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 (5, in this case) are not shown.
For each property being compared, the top bar is ASTM A217 cast 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, % | 21 to 27 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 200 to 320 | |
| 550 to 660 |
| Poisson's Ratio | 0.28 to 0.29 | |
| 0.32 |
| Reduction in Area, % | 39 to 50 | |
| 22 |
| Shear Modulus, GPa | 73 to 75 | |
| 51 |
| Tensile Strength: Ultimate (UTS), MPa | 540 to 710 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 270 to 460 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 to 270 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 410 to 600 | |
| 310 |
| Melting Completion (Liquidus), °C | 1450 to 1460 | |
| 1740 |
| Melting Onset (Solidus), °C | 1410 to 1420 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 500 |
| Thermal Conductivity, W/m-K | 26 to 50 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 13 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 to 7.0 | |
| 60 |
| Density, g/cm3 | 7.8 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 to 2.1 | |
| 32 |
| Embodied Energy, MJ/kg | 20 to 28 | |
| 490 |
| Embodied Water, L/kg | 47 to 87 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 130 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 190 to 570 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 13 to 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 32 |
| Strength to Weight: Axial, points | 19 to 25 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 19 to 23 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 6.9 to 14 | |
| 2.8 |
| Thermal Shock Resistance, points | 16 to 20 | |
| 66 to 100 |