Titanium Ti-6Al-6V-2Sn
UNS R56620 · EN 3.7175 · GB TC10
Ti-6Al-6V-2Sn (UNS R56620, TC10, 3.7175) is an alpha-beta titanium alloy that raises strength and hardenability above Ti-6Al-4V through extra vanadium, tin and copper-bearing chemistry.
Reference datasheet — Ti-6Al-6V-2Sn 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 Annealed condition
Ti-6Al-6V-2Sn tempers and conditions
Ti-6Al-6V-2Sn is supplied in 5 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Transient condition supplied for parts that are formed or machined soft-ish and then aged by the user to full STA strength. | 900 | 1,000 | 16 | 33 HRC | 1.1 % IACS |
solution anneal ~870 °C + stabilize ~700 °C | Used on sheet and thin plate where improved microstructural uniformity and slightly better toughness/creep stability are wanted over single mill anneal. | 960 | 1,030 | 15 | 35 HRC | — |
AnnealedDefault mill annealed (approx. 705–760 °C, air cool) | Standard stocked condition: best balance of strength, ductility and toughness, and the starting point for forming or later STA. | 980 | 1,050 | 14 | 36 HRC | 7 W/m·K |
As-forged + stress relieved (~595–650 °C) | Heavy forgings and billet supplied stress-relieved for rough machining before final anneal or STA. | 990 | 1,060 | 12 | 36 HRC | 1.1 % IACS |
Solution treated and aged | Pick when maximum strength and hardness are required in sections up to ~50 mm; accept lower ductility, toughness and weldability. | 1,170 | 1,275 | 10 | 42 HRC | 7 W/m·K |
What is Ti-6Al-6V-2Sn?
Ti-6Al-6V-2Sn (UNS R56620, TC10, 3.7175) is an alpha-beta titanium alloy that raises strength and hardenability above Ti-6Al-4V through extra vanadium, tin and copper-bearing chemistry. It is chosen for heavy forged sections that must through-harden, delivering 980 MPa yield, 1050 MPa tensile, 14% elongation, 340 HB / 36 HRC and 110 GPa modulus, with service to 315 °C; forms include billet, forgings, bar and plate in annealed, duplex annealed, ST, STA and as-forged conditions. Trade-offs are low machinability (17), poor formability (20) and restricted weldability (35). Ti-6Al-4V remains the choice where ductility, weldability and supply breadth matter more. Ti-6Al-6V-2Sn has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,690°C (3,074 °F). Ti-6Al-6V-2Sn has a yield strength of 980 MPa (142 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 91% of titanium grades. Elongation at break is 14% and the elastic modulus is 110 GPa (16 Msi).
What is Ti-6Al-6V-2Sn used for?
- aircraft structural forgings
- landing gear parts
- ordnance components
Advantages
- High strength — 980 MPa (142 ksi), better than 91% of titanium grades
Limitations
- Needs corrosion protection — 82/100, worse than 100% of titanium grades
- Poor heat conductor — 6.6 W/m·K (3.81 BTU/hr·ft·°F), worse than 97% of titanium grades
- Difficult to weld — 35/100, worse than 96% of titanium grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 83% of titanium grades
- Limited formability — 20/100, worse than 83% of titanium grades
Ti-6Al-6V-2Sn properties
Typical room-temperature values for Ti-6Al-6V-2Sn-Annealed; bars are the position among titanium grades.
Physical3
Ti-6Al-6V-2Sn has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,690°C (3,074 °F).
Mechanical16
Ti-6Al-6V-2Sn has a yield strength of 980 MPa (142 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 91% of titanium grades. Elongation at break is 14% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
Ti-6Al-6V-2Sn is rated for continuous service to 315°C (599 °F). It conducts heat at 6.6 W/m·K (3.81 BTU/hr·ft·°F), worse than 97% of titanium grades. Thermal expansion is 9.1 µm/m·K (5.06 µin/in·°F).
Electrical3
Ti-6Al-6V-2Sn conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), worse than 100% of titanium grades.
Sustainability4
Producing a kilogram of Ti-6Al-6V-2Sn takes about 690 MJ of energy and emits 45 kg of CO₂ — more than 57% of titanium grades. Typical recycled content is 30%.
Manufacturability8
Ti-6Al-6V-2Sn's machinability is poor (17/100, worse than 89% of titanium grades); weldability fair (35/100); formability poor (20/100).
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-6V-2Sn is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-6Al-6V-2Sn
Is Ti-6Al-6V-2Sn easy to machine?
Machine like Ti-6Al-4V but slower: rigid setups, sharp uncoated carbide or PVD-coated tools, surface speeds ~15–30 m/min in STA, heavy flood coolant, no dwelling — chips are pyrophoric and work hardening/galling is severe.
Can Ti-6Al-6V-2Sn be welded?
GTAW/EBW/laser in high-purity argon or vacuum with full backside shielding; weld in the annealed state and post-weld stress relieve — STA welds lose ductility and toughness, so highly loaded joints are usually avoided.
Can Ti-6Al-6V-2Sn be formed, bent or molded?
Hot form or hot size at 700–870 °C; cold forming is limited to gentle bends with generous radii (≥4–5 t) and springback allowance, and forging needs beta-transus control (~945 °C) for the desired alpha morphology.
Ti-6Al-6V-2Sn 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 |
|---|---|---|
| Alalpha stabilizer | 5 – 6 | 5.5 |
| Vbeta stabilizer | 5 – 6 | 5.5 |
| Sn | 1.5 – 2.5 | 2 |
| FeFe+Cu 0.35–1.0 each, aids hardenability | 0.35 – 1 | 0.6 |
| Cu | 0.35 – 1 | 0.6 |
| O | ≤ 0.2 | 0.12 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.04 | 0.02 |
| Hmax, bar/forging | ≤ 0.02 | 0.01 |
| Ymax, where specified | ≤ 0.01 | |
| Other, eachresiduals total 0.4 max | ≤ 0.1 | |
| Ti | balance |
What surface finishes work on Ti-6Al-6V-2Sn?
Grit blast + chemical (HNO3-HF) pickle to remove alpha case; anodic/oxide colour treatments per AMS 2488 for identification, and dry-film lube or ion-nitride/Cr-plate on threads and bearing faces to stop galling.
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-6V-2Sn in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R56620
- EN / DIN / Werkstoff-Nr.
- 3.7175
- GB (China)
- TC10
- Also called
- Ti 6-6-2Ti-6-6-2
- Other
- 4978
How much does Ti-6Al-6V-2Sn cost?
Ti-6Al-6V-2Sn 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-6V-2Sn — frequently asked
What is Ti-6Al-6V-2Sn used for?
Ti-6Al-6V-2Sn is typically used for aircraft structural forgings, landing gear parts and ordnance components. In short: stronger than Ti-6Al-4V; deep-hardening forging alloy; limited weldability, high cost.
What is the yield strength of Ti-6Al-6V-2Sn?
Ti-6Al-6V-2Sn has a typical yield strength of 980 MPa (142 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 91% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is Ti-6Al-6V-2Sn easy to machine?
Not especially — machinability is rated poor (17/100, worse than 89% of titanium grades). Machine like Ti-6Al-4V but slower: rigid setups, sharp uncoated carbide or PVD-coated tools, surface speeds ~15–30 m/min in STA, heavy flood coolant, no dwelling — chips are pyrophoric and work hardening/galling is severe.
Can Ti-6Al-6V-2Sn be welded?
With care — weldability is rated fair (35/100). GTAW/EBW/laser in high-purity argon or vacuum with full backside shielding; weld in the annealed state and post-weld stress relieve — STA welds lose ductility and toughness, so highly loaded joints are usually avoided.
What surface finishes work on Ti-6Al-6V-2Sn?
Grit blast + chemical (HNO3-HF) pickle to remove alpha case; anodic/oxide colour treatments per AMS 2488 for identification, and dry-film lube or ion-nitride/Cr-plate on threads and bearing faces to stop galling.
Can Ti-6Al-6V-2Sn be formed, bent or molded?
Hot form or hot size at 700–870 °C; cold forming is limited to gentle bends with generous radii (≥4–5 t) and springback allowance, and forging needs beta-transus control (~945 °C) for the desired alpha morphology.
What is the maximum service temperature of Ti-6Al-6V-2Sn?
Ti-6Al-6V-2Sn is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-6Al-6V-2Sn Annealed and Ti-6Al-6V-2Sn-STA?
Annealed is the default condition — standard stocked condition: best balance of strength, ductility and toughness, and the starting point for forming or later STA. STA: pick when maximum strength and hardness are required in sections up to ~50 mm; accept lower ductility, toughness and weldability. Yield strength is 980 MPa in Annealed versus 1,170 MPa in STA.
How much does Ti-6Al-6V-2Sn cost?
Ti-6Al-6V-2Sn 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
- AMS 4978 — Titanium Alloy Bars, Forgings and Rings 6Al-6V-2Sn — SAE International (2018)
- ASTM B348 / B381 — Titanium and Titanium Alloy Bars, Billets and Forgings (Grade R56620) — ASTM International (2021)
- GB/T 2965 / GB/T 16598 — (TC10) — SAC (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- MMPDS — Metallic Materials Properties Development and Standardization — Battelle/FAA (2019)
- Titanium alloy bar and forging datasheets (Ti 6-6-2) — TIMET / ATI / (2022)
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.