Titanium Alloy 6Al-7Nb (UNS R56760 / ISO 5832-11) – Niobium-Stabilized Medical Implant Alloy

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Ti-6Al-7Nb is a vacuum-arc-melted and remelted alpha-beta titanium alloy specifically formulated for medical implant applications. Niobium replaces vanadium as the primary beta-stabilizing element, providing comparable mechanical strength to Ti-6Al-4V ELI with enhanced biocompatibility and corrosion resistance. This alloy is widely used for spinal devices, joint replacements, fracture fixation plates, and surgical screws .

1. Product Specifications & Physical Data

ZYTC Alloy supplies Ti-6Al-7Nb in precision forms for medical implant manufacturing requiring verified biocompatibility and mechanical properties.

  • Available Forms: Precision ground bar (1.5mm – 50mm diameter), wire, sheet, and custom configurations .

  • Specifications: ASTM F1295, ISO 5832-11, EN TiAl6Nb7, UNS R56760, Werkstoff Nr. 9.9367 .

Chemical Composition (Weight %)Ti-6Al-7Nb Specification
Aluminum (Al)5.50 - 6.50
Niobium (Nb)6.50 - 7.50
Iron (Fe)0.25 max.
Oxygen (O)0.20 max.
Tantalum (Ta)0.50 max.
Carbon (C)0.08 max.
Nitrogen (N)0.05 max.
Hydrogen (H)0.009 max.
Titanium (Ti)Balance


Physical PropertiesMetricImperial
Density4.52 g/cm³0.163 lb/in³
Modulus of Elasticity105 - 115 GPa15.2 - 16.7 × 10⁶ psi
Beta Transus940 - 990°C1725 - 1815°F
Mechanical Properties (Annealed)MetricImperial
Tensile Strength (min.)900 MPa130 ksi
Yield Strength (0.2% offset, min.)795 MPa115 ksi
Elongation (min.)10%10%
Hardness36 HRC (approx.)36 HRC

 

2. Operating Conditions & Selection Criteria

Ti-6Al-7Nb is specified when designers require a vanadium-free titanium alloy for medical implants with superior biocompatibility and corrosion resistance.

  • Biocompatibility: Niobium substitution eliminates vanadium, which has raised long-term toxicity concerns. The alloy is non-allergenic and exhibits excellent tissue compatibility .

  • Corrosion Resistance: Superior to Ti-6Al-4V ELI in physiological environments due to niobium stabilization; forms stable, passive oxide layer .

  • Mechanical Performance: Comparable strength to Ti-6Al-4V ELI (900 MPa tensile, 795 MPa yield) with equivalent ductility and fracture toughness .

  • Low Interstitials: Controlled low carbon, oxygen, nitrogen, and hydrogen content improves impact resistance, toughness, deformation capability, and machinability .

  • Osseointegration: Promotes bone bonding similar to other titanium alloys, making it ideal for load-bearing implants .

  • Regulatory Compliance: Fully compliant with ASTM F1295 and ISO 5832-11 for surgical implant applications .

3. Fabrication & Material Comparison

  • Melting Process: Vacuum arc melting (VAM) and remelting ensures high purity, homogeneity, and absence of inclusions critical for medical implants .

  • Annealing: Solution annealed at 700-760°C (1292-1400°F) followed by air cooling; relieves residual stresses while maintaining mechanical properties .

  • Machining: Excellent machinability due to low interstitial control; produces consistent surface finish critical for implant applications .

  • Forming: Good ductility permits cold forming for screws, plates, and wires; intermediate annealing may be required for severe deformation .

  • Welding: Good weldability using GTAW with inert gas shielding; suitable for complex implant assemblies .

  • Material Comparison:

    • vs. Ti-6Al-4V ELI (ASTM F136): Comparable strength; superior corrosion resistance; vanadium-free for enhanced biocompatibility .

    • vs. CP Titanium (Grade 2/4): Significantly higher strength (900 MPa vs. 345-550 MPa) for load-bearing applications .

    • vs. CoCrMo (ASTM F75/F1537): Lower modulus (110 GPa vs. 210 GPa) reduces stress shielding; lighter weight .

    • vs. Ti-6Al-7Nb vs. Ti-6Al-4V: Preferred in European and Asian markets where vanadium-free compositions are increasingly specified .

Applications

  • Spinal Devices: Rods, screws, cages, interbody fusion devices

  • Joint Replacements: Hip stems, femoral components, knee tibial trays

  • Fracture Fixation: Bone plates, screws, intramedullary nails, wires

  • Dental Implants: Dental roots, abutments, prosthetic components

  • Surgical Instruments: High-strength instruments requiring biocompatibility

  • Cranial & Maxillofacial: Plates, mesh, screws for facial reconstruction

Contact ZYTC Alloy for certified Ti-6Al-7Nb materials with complete traceability, ASTM F1295/ISO 5832-11 specifications, technical datasheets, and competitive pricing on precision bar sizes.

📧 daisy@zytcsteel.com

🌐 https://www.zytcalloys.com/products/astm-f1295-/-ti-6al-7nb-/-uns-r56760.html

📲 WhatsApp: +86 17335753350

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