Materials / Compare
Steel AISI 1045 vs. Titanium
Compare Steel AISI 1045 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 | 531MPasourceproducer-stated, cold drawn | 885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset |
| Ultimate tensile strength | 627MPasourceproducer-stated, cold drawn | 940MPasourcetypical, plate, annealed |
| Elongation at break | 12%sourcein 2 in (50.8 mm) | 16%sourcetypical, in 2 in., plate annealed |
| Young's modulus (stiffness) | 210GPasourcetypical | 107–122GPasourcetypical range, 20 °C |
| Density | 7,800kg/m³sourcetypical | 4,430kg/m³sourcenominal |
| Strength to weight | 68.1kN·m/kg | 200kN·m/kg2.93x higher |
| Stiffness to weight | 26.9MN·m/kg4% higher | 25.8MN·m/kg |
| Poisson's ratio | 0.3sourcetypical | 0.342sourcemean of TIMET measurements |
| Shear modulus | 80.8GPa1.89x stiffer in shear | 42.7GPa |
| Bulk modulus | 175GPa | 121GPa |
| Speed of sound | 5,189m/s | 5,084m/s |
| Thermal | ||
| Thermal conductivity | 40–45W/m·Ksourcetypical range, ambient | 6.6W/m·Ksourcetypical, 20 °C, mill annealed |
| Thermal expansion | 12µm/m·Ksourcetypical, 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 | 460–480J/kg·Ksourcetypical range, 50/100 °C | 580J/kg·Ksourcetypical, 20 °C |
| Heats up and cools (diffusivity) | 11.6mm²/s4.51x faster | 2.57mm²/s |
| Thermal shock resistance | 6,269W/m1.68x 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 1045 cold drawn bar (Niagara LaSalle) for mechanical; Ovako C45 (lists 'SAE 1045' as a similar designation) for physical constants | 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 1045 stronger than Titanium?
Titanium is stronger: its yield strength is 885 MPa against 531 MPa for Steel AISI 1045 (1.67x).
Which is lighter, Steel AISI 1045 or Titanium?
Titanium is lighter: 4,430 kg/m³ against 7,800 kg/m³ for Steel AISI 1045.
Which is stiffer, Steel AISI 1045 or Titanium?
Steel AISI 1045 is stiffer: Young's modulus 210 GPa against 115 GPa for Titanium, so the same part in Steel AISI 1045 deflects less under the same load.
Which is lighter for the same job, Steel AISI 1045 or Titanium?
For the same stiffness or strength: Steel AISI 1045 is lighter for a stiff rod or tie (tension); Titanium is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Steel AISI 1045 | Titanium |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 4% heavier |
| Stiff beam (bending) | 30% heavier | lighter |
| Stiff panel or plate | 44% heavier | lighter |
| Strong rod or tie | 2.93x heavier | lighter |
| Strong beam | 2.48x heavier | lighter |
| Strong panel or plate | 2.27x 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 1045 or Titanium?
Steel AISI 1045 conducts heat better: 42.5 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 1045.