Ti Grade 23
Ti-6Al-4V ELI (Extra Low Interstitials) — the medical-grade version of the most common titanium alloy. Lower O, N, C, Fe limits than Grade 5 for improved fracture toughness, ductility, and biocompatibility. ASTM F136 specifies it for surgical implants. Slightly lower strength than Grade 5 but better fatigue crack growth resistance. Used for orthopedic implants (hip/knee), spinal fixation, dental implants, and cryogenic aerospace applications.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 23 / UNS R56401 | R56401 | REF |
| 🇪🇺 | EN | Europe | Ti-6Al-4V ELI (3.7165 ELI variant) | — | 95% |
Sources: ASTM F136, ISO 5832-3
Mechanical properties
Compatibility verdict
Ti Grade 23 and Ti-6Al-4V ELI (3.7165 ELI variant): 95% composition match
Related materials
Ti-6Al-4V (Grade 5)
3.7164The most widely used titanium alloy — accounts for ~50% of all titanium production. Alpha-beta alloy with exceptional strength-to-weight ratio. Used for jet engine components, airframe structures, medical implants (hip/knee), fasteners, and racing components. Biocompatible.
Titanium Grade 2 (CP)
3.7035The workhorse commercially pure titanium grade. Best balance of strength, ductility, and corrosion resistance among CP grades. Excellent resistance to seawater, chlorides, and oxidizing acids. Used for heat exchangers, chemical processing, marine hardware, desalination, and medical implants.
Titanium Grade 1
3.7025The softest and most ductile commercially pure titanium grade. Lowest O content (0.18% max) for maximum formability. Used for plate heat exchangers, chemical plant vessels, explosive cladding, deep-drawn parts, and anodizing applications. Lower strength than Grade 2 but superior formability.
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