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
Chemical composition comparison (wt%)
Side-by-side: Ti Grade 23 (ASTM) (ASTM F136) vs Ti-6Al-4V ELI (3.7165 ELI variant) (EN)
| Element | Ti Grade 23 (ASTM) | Ti-6Al-4V ELI (3.7165 ELI variant) (EN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| V | 3.5–4.5% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| N | 0–0.03% | — | — |
| Fe | 0–0.25% | — | — |
| O | 0–0.13% | — | — |
| H | 0–0.0125% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 860–930 | MPa |
| Yield Strength | 795–860 | MPa |
| Elongation | 10–15 | % |
| Elastic Modulus | ≥ 114 | GPa |
| Density | ≥ 4.43 | g/cm3 |
Compatibility verdict
Ti Grade 23 and Ti-6Al-4V ELI (3.7165 ELI variant): 95% composition match
Close equivalents but NOT identical.
Related materials
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.
Titanium Grade 4
3.7065The strongest commercially pure titanium grade. Highest oxygen content (0.40% max) for maximum strength among CP grades. UTS min 550 MPa — approaches some Ti alloys. Used for airframe skins, marine hardware, surgical implants, and chemical plant components requiring higher strength than Grade 2.
Ti Grade 9 / Ti-3Al-2.5V
3.7195Medium-strength alpha-beta titanium alloy — the standard for seamless tubing. 50% stronger than CP Grade 2 with better cold formability than Ti-6Al-4V. The go-to alloy for hydraulic tubing in aerospace and bicycle frames. Used for aircraft hydraulic lines, offshore risers, and sporting goods.
Not sure which material fits?
🤖 Ask AI Advisor →All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.