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The essential difference between Ti-6Al-4V ELI (Grade 23) and Ti-6Al-4V (Grade 5)

Why is used Ti-6Al-4V ELI (grade 23) instead of Ti-6Al-4V (grade 5) on medical implants


Titanium Grade 5 (6AL-4V)is an alloyed titanium product containing 6% Aluminum and 4% Vanadium; is a medium strength product. This titanium grade is predominantly used in airframe and turbine engine parts; and for use in surgical implants


Titanium Grade 23(Ti-6Al-4V ELI0) contains 6% aluminium, 4% vanadium, 0.13% (maximum) Oxygen. Improved ductility and fracture toughness with some reduction in strength.


The essential difference between Ti-6Al-4V ELI (Grade 23) and Ti-6Al-4V (Grade 5) is the reduction of oxygen content to 0.13% max in Grade 23. This confers improved ductility and fracture toughness, with some reduction in strength. Grade 23 has been widely used in fracture critical airframe structures and for offshore tubulars. Mechanical properties for fracture critical applications can be enhanced through processing and heat treatment.