Grade 23 titanium, also known as Ti-6Al-4V-ELI, has excellent mechanical properties and corrosion resistance combined with low specific weight and Titanium Ti-6Al-4V-ELI has excellent mechanical properties and corrosion resistance combined with low specific weight and biocompatibility.
ELI is an acronym for Extra Low Interstitial, indicating that this alloy has a very low amount of interstitial elements (carbon, oxygen, nitrogen, hydrogen). The interstitial elements are inserted in the crystalline lattice of the material making the structure more fragile and reducing elongation at break; however, they also result in an increase in the mechanical properties, for this reason, it is preferable to vary the amount according to the alloy’s intended use.
If an extremely ductile and tough material is required, the interstitial elements should be reduced as much as possible, just as it was done for grade 23 titanium which contains 6% aluminium, 4% vanadium, 0.13% (maximum) of oxygen and the rest titanium. Also, grade 23 titanium has better ductility than grade 5.
This material is ideal for many high-performance engineering applications, for example in aero-space and motor racing, and also for the production of biomedical implants. Standard processing parameters use full melting of the entire geometry. Parts built from Titanium Ti-6Al-4V-ELI can be machined, spark-eroded, welded, micro shot-peened, polished and coated if required.
|Mechanical Properties||Test Method||As Built||Annealing|
|Tensile strength||ASTM E8||1200 ± 40 MPa||1059 ± 43 MPa|
|Proof stress (Rp0.2)||ASTM E8||1013 ± 55 MPa||973 ± 68 MPa|
|Elongation at Break||ASTM E8||8 ± 2%||10 ± 2%|
|Young’s Modulus||ASTM E8||113 ± 8 GPa||115 ± 5 GPa|
|Hardness||ISO 6508-1||46 ± 3 HRC||45 ± 3 HRC|
|Chemical Composition and Physical Properties|
5,5 - 6,75%
3,5 - 4,5%
|Physical Properties||Relative density||Approx. 99,99 %|
|Annealing||RT -> 840°||4h||Inert/Vacuum|
|840°C -> RT||-||Inert|