Materials / Compare
Steel AISI 1018 vs. Titanium
Compare Steel AISI 1018 vs. Titanium strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 372MPasourceproducer-stated, cold drawn | 885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset |
| Ultimate tensile strength | 441MPasourceproducer-stated, cold drawn | 940MPasourcetypical, plate, annealed |
| Elongation at break | 15%sourcein 2 in (50.8 mm) | 16%sourcetypical, in 2 in., plate annealed |
| Young's modulus (stiffness) | 200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 107–122GPasourcetypical range, 20 °C |
| Density | 7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 4,430kg/m³sourcenominal |
| Strength to weight | 47.3kN·m/kg | 200kN·m/kg4.22x higher |
| Stiffness to weight | 25.4MN·m/kg | 25.8MN·m/kg2% higher |
| Poisson's ratio | 0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 0.342sourcemean of TIMET measurements |
| Shear modulus | 75.7GPa1.77x stiffer in shear | 42.7GPa |
| Bulk modulus | 185GPa | 121GPa |
| Speed of sound | 5,043m/s | 5,084m/s |
| Thermal | ||
| Thermal conductivity | 51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 6.6W/m·Ksourcetypical, 20 °C, mill annealed |
| Thermal expansion | 12µm/m·Ksourcebase material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); mean 20-300 °C | 9µm/m·Ksourcetypical, mean 0-100 °C |
| 100 mm part over a 50 °C swing | 60µm growth | 45µm growth33% less |
| Specific heat | 486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 580J/kg·Ksourcetypical, 20 °C |
| Heats up and cools (diffusivity) | 13.6mm²/s5.29x faster | 2.57mm²/s |
| Thermal shock resistance | 5,473W/m47% more resistant | 3,730W/m |
| Melting point | not sourced | 1,630–1,650°Csourcemelting range |
| Max service temperature | not sourced | 400°Csourceupper recommended use temperature |
| Values for | AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer) | TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Steel AISI 1018 stronger than Titanium?
Titanium is stronger: its yield strength is 885 MPa against 372 MPa for Steel AISI 1018 (2.38x).
Which is lighter, Steel AISI 1018 or Titanium?
Titanium is lighter: 4,430 kg/m³ against 7,861 kg/m³ for Steel AISI 1018.
Which is stiffer, Steel AISI 1018 or Titanium?
Steel AISI 1018 is stiffer: Young's modulus 200 GPa against 115 GPa for Titanium, so the same part in Steel AISI 1018 deflects less under the same load.
Which is lighter for the same job, Steel AISI 1018 or Titanium?
For the same stiffness or strength: Titanium is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Steel AISI 1018 | Titanium |
|---|---|---|
| Stiff rod or tie (tension) | 2% heavier | lighter |
| Stiff beam (bending) | 34% heavier | lighter |
| Stiff panel or plate | 47% heavier | lighter |
| Strong rod or tie | 4.22x heavier | lighter |
| Strong beam | 3.16x heavier | lighter |
| Strong panel or plate | 2.74x heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Steel AISI 1018 or Titanium?
Steel AISI 1018 conducts heat better: 51.9 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 12 µm/m·K for Steel AISI 1018.