Materials / Compare
Steel AISI 4340 vs. DMLS Ti-6Al-4V ELI Titanium
Compare Steel AISI 4340 vs. DMLS Ti-6Al-4V ELI 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 | 1,035MPasourcetypical, transverse | 1,100MPasourcetypical, as built, average of horizontal + vertical (M400) |
| Ultimate tensile strength | 1,140MPasourcetypical, transverse | 1,270MPasourcetypical, as built, average of horizontal + vertical (M400) |
| Elongation at break | 18%sourcetypical, transverse | 8.7%sourcetypical at break, as built (M400) |
| Young's modulus (stiffness) | 200GPasourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered) | 110GPasourcesame maker and process, sibling grade: EOS Titanium Ti64 (Grade 5) on EOS M 290, as built, XY and Z, typical |
| Density | 7,840kg/m³sourcetypical | 4,400kg/m³sourcetypical part density (ISO 3369), M400 |
| Strength to weight | 132kN·m/kg | 250kN·m/kg1.89x higher |
| Stiffness to weight | 25.5MN·m/kg2% higher | 25MN·m/kg |
| Poisson's ratio | 0.32sourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered) | 0.342sourcewrought TIMETAL 6-4 (TIMET measurement, mean of 10); composition-level, not DMLS-measured |
| Shear modulus | 75.7GPa1.85x stiffer in shear | 41GPa |
| Bulk modulus | 185GPa | 116GPa |
| Speed of sound | 5,049m/s | 5,000m/s |
| Thermal | ||
| Thermal conductivity | 37.5W/m·Ksourcetypical | 6.6W/m·Ksourcebase material: wrought Ti-6Al-4V / 6-4 ELI (TIMET datasheet), 20 °C |
| Thermal expansion | 11.3µm/m·Ksourcemean, -18 to 93 °C | 9µm/m·Ksourcemean 25-100 °C, ASTM E228; EOS Ti64 Grade 23 (=ELI) on EOS M 290 40 µm; condition not stated (sheet's mechanical data are heat treated) |
| 100 mm part over a 50 °C swing | 56.5µm growth | 45µm growth26% less |
| Specific heat | 448J/kg·Ksourcetypical | 580J/kg·Ksourcebase material: wrought Ti-6Al-4V / 6-4 ELI (TIMET datasheet), 20 °C |
| Heats up and cools (diffusivity) | 10.7mm²/s4.13x faster | 2.59mm²/s |
| Thermal shock resistance | 11,678W/m2.42x more resistant | 4,825W/m |
| Melting point | not sourced | 1,630–1,650°Csourcemelting range, wrought TIMETAL 6-4 (composition-level) |
| Values for | Carpenter (Latrobe) Lescalloy 4340 VAC-ARC datasheet; mechanical row for 1100 °F temper; physical properties grade-level | EOS Titanium Ti64ELI (powder 9011-0040; ASTM F136/F3001, i.e. Grade 23) on EOS M400 SF, parameter set Ti64ELI_030_FlexM400_100, 30 µm, as built; ISO 6892-1 A14 |
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.
DMLS Ti-6Al-4V ELI Titanium is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Steel AISI 4340 stronger than DMLS Ti-6Al-4V ELI Titanium?
DMLS Ti-6Al-4V ELI Titanium is stronger: its yield strength is 1,100 MPa against 1,035 MPa for Steel AISI 4340 (6%).
Which is lighter, Steel AISI 4340 or DMLS Ti-6Al-4V ELI Titanium?
DMLS Ti-6Al-4V ELI Titanium is lighter: 4,400 kg/m³ against 7,840 kg/m³ for Steel AISI 4340.
Which is stiffer, Steel AISI 4340 or DMLS Ti-6Al-4V ELI Titanium?
Steel AISI 4340 is stiffer: Young's modulus 200 GPa against 110 GPa for DMLS Ti-6Al-4V ELI Titanium, so the same part in Steel AISI 4340 deflects less under the same load.
Which is lighter for the same job, Steel AISI 4340 or DMLS Ti-6Al-4V ELI Titanium?
For the same stiffness or strength: Steel AISI 4340 is lighter for a stiff rod or tie (tension); DMLS Ti-6Al-4V ELI 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 4340 | DMLS Ti-6Al-4V ELI Titanium |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 2% heavier |
| Stiff beam (bending) | 32% heavier | lighter |
| Stiff panel or plate | 46% heavier | lighter |
| Strong rod or tie | 1.89x heavier | lighter |
| Strong beam | 1.86x heavier | lighter |
| Strong panel or plate | 1.84x 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 4340 or DMLS Ti-6Al-4V ELI Titanium?
Steel AISI 4340 conducts heat better: 37.5 W/m·K against 6.6 W/m·K for DMLS Ti-6Al-4V ELI Titanium.
Which expands less with temperature?
DMLS Ti-6Al-4V ELI Titanium expands less: 9 µm/m·K against 11.3 µm/m·K for Steel AISI 4340.
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