Titanium Ti-6Al-7Nb
UNS R56700 · ASTM F1295 · ISO 5832-11
Ti-6Al-7Nb (UNS R56700, ASTM F1295) is an alpha-beta titanium alloy in which niobium replaces the vanadium of Ti-6Al-4V, giving a vanadium-free composition for long-term implant contact.
Reference datasheet — Ti-6Al-7Nb is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
Ti-6Al-7Nb tempers and conditions
Ti-6Al-7Nb is supplied in 7 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Investment cast + HIP (dental/implant castings) | Complex-geometry dental frameworks and prototype implants; coarser lamellar structure, lower ductility than wrought. | 840 | 930 | 8 | 31 HRC | 1.3 % IACS |
ANNDefault Annealed | Standard stocked implant-bar condition: balanced strength, ductility and machinability. | 900 | 1,000 | 13 | 32 HRC | — |
Additive + HIP / vacuum anneal | Post-processed printed parts: pores closed and martensite decomposed, giving wrought-like ductility and fatigue life. | 910 | 1,000 | 13 | 32 HRC | 1.3 % IACS |
As-forged / hot worked + stress relieved | Near-net implant forgings (hip stems, plates) with worked flow lines and slightly higher strength than plain annealed bar. | 940 | 1,030 | 12 | 33 HRC | 1.3 % IACS |
Solution treated and aged | Choose when maximum strength and fatigue life are needed, e.g. slender hip stems and screws. | 1,020 | 1,120 | 10 | 36 HRC | 1.3 % IACS |
Additive (L-PBF/EBM) as-built + stress relief | Porous/lattice or patient-specific implants printed from Ti-6Al-7Nb powder; strong but anisotropic with limited ductility. | 1,030 | 1,130 | 8 | 38 HRC | 1.3 % IACS |
Cold drawn | For cerclage wire, K-wires and fine screws where high strength in small sections matters more than ductility. | 1,050 | 1,150 | 9 | 37 HRC | 1.3 % IACS |
What is Ti-6Al-7Nb?
Ti-6Al-7Nb (UNS R56700, ASTM F1295) is an alpha-beta titanium alloy in which niobium replaces the vanadium of Ti-6Al-4V, giving a vanadium-free composition for long-term implant contact. Annealed bar and forgings reach about 900 MPa yield, 1000 MPa tensile, 13% elongation and 32 HRC, and the grade is available as bar, forgings, cold-drawn stock, castings and additively manufactured parts (AM-AB, AM-HIP, CAST-HIP). Cold formability is limited, machinability is low, and service is capped near 350 °C; Ti-6Al-4V ELI is the nearest alternative where vanadium is acceptable. Ti-6Al-7Nb has a density of 4.52 g/cm³ (0.163 lb/in³), heavier than 77% of titanium grades. It melts at 1,600°C (2,912 °F). Ti-6Al-7Nb has a yield strength of 900 MPa (131 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 82% of titanium grades. Elongation at break is 13% and the elastic modulus is 105 GPa (15.2 Msi).
What is Ti-6Al-7Nb used for?
- orthopedic implants
- dental implants
- bone screws
- surgical instruments
Advantages
- Polishes to a fine finish — 80/100, better than 98% of titanium grades
- High strength — 900 MPa (131 ksi), better than 82% of titanium grades
Limitations
- Difficult to weld — 65/100, worse than 77% of titanium grades
Ti-6Al-7Nb properties
Typical room-temperature values for Ti-6Al-7Nb-ANN; bars are the position among titanium grades.
Physical3
Ti-6Al-7Nb has a density of 4.52 g/cm³ (0.163 lb/in³), heavier than 77% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical16
Ti-6Al-7Nb has a yield strength of 900 MPa (131 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 82% of titanium grades. Elongation at break is 13% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
Ti-6Al-7Nb is rated for continuous service to 350°C (662 °F). It conducts heat at 7 W/m·K (4.04 BTU/hr·ft·°F), worse than 76% of titanium grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Ti-6Al-7Nb conducts electricity at 1.3 % IACS, worse than 51% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 72% of titanium grades.
Sustainability4
Producing a kilogram of Ti-6Al-7Nb takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 15%.
Manufacturability8
Ti-6Al-7Nb's machinability is poor (20/100, worse than 68% of titanium grades); weldability good (65/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. Ti-6Al-7Nb is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-6Al-7Nb
Is Ti-6Al-7Nb easy to machine?
Machine like Ti-6Al-4V: rigid setup, sharp uncoated-carbide or PVD tools, low surface speed (25–45 m/min), high feed, flood coolant — poor thermal conductivity causes edge burning and work hardening.
Can Ti-6Al-7Nb be welded?
GTAW, plasma, laser and EBW give sound joints with full argon/vacuum shielding and trailing gas; avoid contamination (O, N, H) which embrittles the weld, and never weld in air or with flux.
Can Ti-6Al-7Nb be formed, bent or molded?
Cold formability is limited (large bend radii, high springback); hot forming/forging at 850–950 °C below the ~1010 °C β-transus is the normal route.
Ti-6Al-7Nb chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Alα stabilizer | 5.5 – 6.5 | 6 |
| Nbβ stabilizer, replaces V | 6.5 – 7.5 | 7 |
| Taresidual from Nb feedstock | ≤ 0.5 | 0.25 |
| Fe | ≤ 0.25 | 0.1 |
| O | ≤ 0.2 | 0.15 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.05 | 0.01 |
| H0.009 % bar; higher limits for other forms | ≤ 0.01 | 0 |
| Ti | balance |
What surface finishes work on Ti-6Al-7Nb?
Takes electropolishing, grit blasting, plasma-sprayed HA and anodizing (colour type II or thick TiO₂) very well; avoid iron contamination during blasting/grinding and passivate per ASTM F86.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium Ti-6Al-7Nb in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R56700
- ASTM
- F1295
- ISO
- 5832-11
How much does Ti-6Al-7Nb cost?
Ti-6Al-7Nb is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Ti-6Al-7Nb — frequently asked
What is Ti-6Al-7Nb used for?
Ti-6Al-7Nb is typically used for orthopedic implants, dental implants, bone screws and surgical instruments. In short: vanadium-free implant titanium; ti-6Al-4V strength, F1295 grade; implant-quality bar and forgings.
What is the yield strength of Ti-6Al-7Nb?
Ti-6Al-7Nb has a typical yield strength of 900 MPa (131 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 82% of titanium grades. Strength varies by condition: see the 7 listed tempers.
Is Ti-6Al-7Nb easy to machine?
Not especially — machinability is rated poor (20/100, worse than 68% of titanium grades). Machine like Ti-6Al-4V: rigid setup, sharp uncoated-carbide or PVD tools, low surface speed (25–45 m/min), high feed, flood coolant — poor thermal conductivity causes edge burning and work hardening.
Can Ti-6Al-7Nb be welded?
Yes — weldability is rated good (65/100). GTAW, plasma, laser and EBW give sound joints with full argon/vacuum shielding and trailing gas; avoid contamination (O, N, H) which embrittles the weld, and never weld in air or with flux.
What surface finishes work on Ti-6Al-7Nb?
Takes electropolishing, grit blasting, plasma-sprayed HA and anodizing (colour type II or thick TiO₂) very well; avoid iron contamination during blasting/grinding and passivate per ASTM F86.
Can Ti-6Al-7Nb be formed, bent or molded?
Cold formability is limited (large bend radii, high springback); hot forming/forging at 850–950 °C below the ~1010 °C β-transus is the normal route.
What is the maximum service temperature of Ti-6Al-7Nb?
Ti-6Al-7Nb is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-6Al-7Nb-ANN and Ti-6Al-7Nb-CD?
ANN is the default condition — standard stocked implant-bar condition: balanced strength, ductility and machinability. CD: for cerclage wire, K-wires and fine screws where high strength in small sections matters more than ductility. Yield strength is 900 MPa in ANN versus 1,050 MPa in CD.
How much does Ti-6Al-7Nb cost?
Ti-6Al-7Nb is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM F1295 — Wrought Titanium-6Aluminum-7Niobium Alloy for Surgical Implant Applications (UNS R56700) — ASTM International (2023)
- ISO 5832-11 — Implants for surgery, Metallic materials, Part 11: Wrought titanium 6-aluminium 7-niobium alloy — ISO (2014)
- ASM Handbook Vol. 2 / Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Medical titanium alloy bar datasheets (Ti-6Al-7Nb) — specialty Ti producers (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.