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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS R56700 / ASTM F1295 | R56700 | REF |
| 🇪🇺 | EN | Europe | DIN 3.7195 | 3.7195 | 100% |
Sources: ASTM F1295, ISO 5832-11
Chemical composition comparison (wt%)
Side-by-side: Ti-6Al-7Nb (ASTM) (ASTM F1295) vs DIN 3.7195 (EN)
| Element | Ti-6Al-7Nb (ASTM) | DIN 3.7195 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| Nb | 6.5–7.5% | — | — |
| N | 0–0.05% | — | — |
| Fe | 0–0.25% | — | — |
| O | 0–0.2% | — | — |
| Ta | 0–0.5% | — | — |
| H | 0–0.009% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 900–1050 | MPa |
| Yield Strength | 800–950 | MPa |
| Elongation | 8–15 | % |
| Elastic Modulus | ≥ 105 | GPa |
| Density | ≥ 4.52 | g/cm3 |
Compatibility verdict
Ti-6Al-7Nb and DIN 3.7195: 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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