Ti-6Al-4V ELI (Grade 23) vs Ti-6Al-7Nb: 91% composition overlap. Very similar materials, likely interchangeable for most applications.
Ti-6Al-4V ELI (Grade 23) vs Ti-6Al-7Nb
Side-by-side chemical composition and mechanical property comparison.
Overview
Ti-6Al-4V ELI (Grade 23)
R56401
Extra 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.
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 23) | Ti-6Al-7Nb | |
|---|---|---|
| Material Number | R56401 | — |
| Category | Titanium | Titanium |
| Standard | ASTM F136 | ISO 5832-11 |
Chemical composition (wt%)
| Element | Ti-6Al-4V ELI (Grade 23) | Ti-6Al-7Nb | Overlap |
|---|---|---|---|
| C | ≤ 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-4V ELI (Grade 23) | Ti-6Al-7Nb | Unit |
|---|---|---|---|
| tensile_strength | ≥ 860 | 900–1050 | MPa |
| yield_strength | ≥ 795 | 800–950 | MPa |
| elongation | ≥ 10 | 8–15 | % |
Compatibility Assessment
Ti-6Al-4V ELI (Grade 23) and Ti-6Al-7Nb 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-4V ELI (Grade 23) the same as Ti-6Al-7Nb?
Ti-6Al-4V ELI (Grade 23) and Ti-6Al-7Nb have a 91% composition overlap. For most purposes, they can be considered similar.
Can I replace Ti-6Al-4V ELI (Grade 23) with Ti-6Al-7Nb?
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-4V ELI (Grade 23) and Ti-6Al-7Nb?
The main differences are in the following elements: overall alloying content. Ti-6Al-4V ELI (Grade 23) is a Titanium grade, while Ti-6Al-7Nb is a Titanium grade.
View full data for each material:
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.