Ti-6Al-4V ELI (Grade 23)
R56401Extra Low Interstitial version of Ti-6Al-4V (Grade 5) — the gold standard for surgical implants. Reduced O (≤0.13%), Fe (≤0.25%), and C (≤0.08%) versus Grade 5 enhance ductility, fracture toughness, and fatigue strength with some strength reduction. Biocompatible (ASTM F136), MRI-compatible, and spontaneously passivating. Used for orthopedic implants (hip/knee replacements, spinal fixation), dental implants, bone plates/screws, aerospace structural components requiring high damage tolerance, and cryogenic vessels down to -320°C. W.Nr. 3.7165.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | R56401 | R56401 | REF |
| ISO | INT | ISO 5832-3 | — | 100% |
Sources: ASTM F136, ISO 5832-3
Chemical composition comparison (wt%)
Side-by-side: Ti-6Al-4V ELI (Grade 23) (ASTM) (ASTM F136) vs ISO 5832-3 (ISO)
| Element | Ti-6Al-4V ELI (Grade 23) (ASTM) | ISO 5832-3 (ISO) | Overlap |
|---|---|---|---|
| C | ≤ 0.08% | — | — |
| V | 3.5–4.5% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| N | ≤ 0.05% | — | — |
| O | ≤ 0.13% | — | — |
| Fe | ≤ 0.25% | — | — |
| H | ≤ 0.012% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 860 | MPa |
| Yield Strength | ≥ 795 | MPa |
| Elongation | ≥ 10 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 4.43 | g/cm3 |
| Elastic Modulus | ≥ 114 | GPa |
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 860 | MPa |
| Yield Strength Rp0.2 | ≥ 795 | MPa |
| Elongation A | ≥ 10 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | 4.43 | g/cm³ |
| Elastic Modulus | 114 | GPa |
Compatibility verdict
Ti-6Al-4V ELI (Grade 23) and ISO 5832-3: 100% 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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