Ti-6Al-7Nb vs Ti-6Al-4V ELI (Grade 5 ELI): 91% composition overlap. Very similar materials, likely interchangeable for most applications.
Ti-6Al-7Nb vs Ti-6Al-4V ELI (Grade 5 ELI)
Side-by-side chemical composition and mechanical property comparison.
Overview
Ti-6Al-7Nb
Alpha-beta titanium alloy with Nb replacing V — developed specifically to eliminate vanadium cytotoxicity concerns. Similar mechanical properties to Ti-6Al-4V but with superior biocompatibility and corrosion resistance in body fluids. ISO 5832-11 / ASTM F1295 for surgical implants. Trade name: IMI 367 (originally). Used for hip prostheses, knee replacements, fracture fixation plates, spinal devices, screws, and dental implants.
Ti-6Al-4V ELI (Grade 5 ELI)
3.7165
Extra 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.
| Ti-6Al-7Nb | Ti-6Al-4V ELI (Grade 5 ELI) | |
|---|---|---|
| Material Number | — | 3.7165 |
| Category | Titanium | Titanium |
| Standard | ISO 5832-11 | ASTM F136 |
Chemical composition (wt%)
| Element | Ti-6Al-7Nb | Ti-6Al-4V ELI (Grade 5 ELI) | Overlap |
|---|---|---|---|
| C | 0–0.08% | 0–0.08% | OK |
| V | — | 3.5–4.5% | — |
| Al | 5.5–6.5% | 5.5–6.5% | OK |
| Ti | — | — | — |
Mechanical properties
| Property | Ti-6Al-7Nb | Ti-6Al-4V ELI (Grade 5 ELI) | Unit |
|---|---|---|---|
| tensile_strength | 900–1050 | ≥ 860 | MPa |
| yield_strength | 800–950 | ≥ 795 | MPa |
| elongation | 8–15 | ≥ 10 | % |
Compatibility Assessment
Ti-6Al-7Nb and Ti-6Al-4V ELI (Grade 5 ELI) have very similar compositions (91% overlap) and are likely interchangeable for most applications. Verify mechanical properties for your specific use case.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Ti-6Al-7Nb the same as Ti-6Al-4V ELI (Grade 5 ELI)?
Ti-6Al-7Nb and Ti-6Al-4V ELI (Grade 5 ELI) have a 91% composition overlap. For most purposes, they can be considered similar.
Can I replace Ti-6Al-7Nb with Ti-6Al-4V ELI (Grade 5 ELI)?
In many cases, yes. The compositions overlap significantly (91%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between Ti-6Al-7Nb and Ti-6Al-4V ELI (Grade 5 ELI)?
The main differences are in the following elements: overall alloying content. Ti-6Al-7Nb is a Titanium grade, while Ti-6Al-4V ELI (Grade 5 ELI) is a Titanium grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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.