Ti-6Al-4V ELI (Grade 5 ELI)
3.7165Extra Low Interstitial version of Ti-6Al-4V — the standard titanium for surgical implants. Reduced O, N, C, Fe for improved ductility, fracture toughness, and biocompatibility. Used for hip and knee implants, bone screws, dental implants, spinal fusion devices, and cardiovascular stents. Also called Grade 23.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 23 / UNS R56401 | R56401 | REF |
| ISO | INT | ISO 5832-3 | — | 100% | |
| 🇪🇺 | EN | Europe | Ti-6Al-4V ELI / 3.7165 | 3.7165 | 95% |
Sources: ASTM F136, ISO 5832-3
Chemical composition comparison (wt%)
Side-by-side: Ti-6Al-4V ELI (Grade 5 ELI) (ASTM) (ASTM F136) vs Ti-6Al-4V ELI / 3.7165 (EN)
| Element | Ti-6Al-4V ELI (Grade 5 ELI) (ASTM) | Ti-6Al-4V ELI / 3.7165 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| V | 3.5–4.5% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| N | 0–0.05% | — | — |
| Fe | 0–0.25% | — | — |
| O | 0–0.13% | — | — |
| H | 0–0.012% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 860 | MPa |
| Yield Strength | ≥ 795 | MPa |
| Elongation | ≥ 10 | % |
| Elastic Modulus | ≥ 114 | GPa |
| Density | ≥ 4.43 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 700–785 °C | air or vacuum | 1-4 hours | Vacuum or inert atmosphere preferred for implant-grade |
Compatibility verdict
Ti-6Al-4V ELI (Grade 5 ELI) and Ti-6Al-4V ELI / 3.7165: 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.
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