Titanium Ti-6Al-2Nb-1Ta-0.8Mo-STA (Solution treated and aged)
Heat-treated state
Choose when higher strength is needed in thin sections and toughness can be traded down.
Values for the STA condition
Other Ti-6Al-2Nb-1Ta-0.8Mo tempers and conditions
Ti-6Al-2Nb-1Ta-0.8Mo is listed in 3 conditions; see the grade overview at Ti-6Al-2Nb-1Ta-0.8Mo.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Property basis for weldments in thick-section fabrications; joints normally overmatch base-metal ductility requirements. | 765 | 855 | 10 | 31 HRC | 1.1 % IACS |
AnnealedDefault mill (alpha-beta) annealed plate/bar | General stocking condition: balanced strength, ductility and weldability for plate and bar. | 780 | 860 | 15 | 30 HRC | — |
STAThis page Solution treated and aged | Choose when higher strength is needed in thin sections and toughness can be traded down. | 865 | 950 | 11 | 33 HRC | — |
What is Ti-6Al-2Nb-1Ta-0.8Mo-STA?
Ti-6Al-2Nb-1Ta-0.8Mo-STA is Ti-6Al-2Nb-1Ta-0.8Mo heat treated to STA — choose when higher strength is needed in thin sections and toughness can be traded down. Ti-6Al-2Nb-1Ta-0.8Mo-STA has a yield strength of 865 MPa (125 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 74% of titanium grades. Elongation at break is 11% and the elastic modulus is 114 GPa (16.5 Msi). Ti-6Al-2Nb-1Ta-0.8Mo-STA has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,620°C (2,948 °F). Annealed is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- High service temperature — 400°C (752 °F), better than 78% of titanium grades
Limitations
- Limited ductility — 11%, worse than 87% of titanium grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 83% of titanium grades
- Limited formability — 22/100, worse than 78% of titanium grades
- Difficult to weld — 65/100, worse than 77% of titanium grades
Ti-6Al-2Nb-1Ta-0.8Mo-STA properties
Typical room-temperature values for Ti-6Al-2Nb-1Ta-0.8Mo-STA; 13 are specific to this condition. Other listed values are Ti-6Al-2Nb-1Ta-0.8Mo reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-6Al-2Nb-1Ta-0.8Mo-STA has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,620°C (2,948 °F).
Mechanical16
Ti-6Al-2Nb-1Ta-0.8Mo-STA has a yield strength of 865 MPa (125 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 74% of titanium grades. Elongation at break is 11% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti-6Al-2Nb-1Ta-0.8Mo-STA is rated for continuous service to 400°C (752 °F). It conducts heat at 7 W/m·K (4.04 BTU/hr·ft·°F), worse than 76% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
Ti-6Al-2Nb-1Ta-0.8Mo-STA conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (95/100), better than 83% of titanium grades.
Sustainability4
Producing a kilogram of Ti-6Al-2Nb-1Ta-0.8Mo-STA takes about 650 MJ of energy and emits 42 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti-6Al-2Nb-1Ta-0.8Mo-STA's machinability is poor (15/100, worse than 97% of titanium grades); weldability good (65/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-6Al-2Nb-1Ta-0.8Mo-STA
Is Ti-6Al-2Nb-1Ta-0.8Mo easy to machine?
Machine like Ti-6Al-4V but slightly softer: rigid setups, sharp uncoated carbide, 25–45 m/min, heavy flood coolant and positive feed to avoid work-hardening and galling.
Can Ti-6Al-2Nb-1Ta-0.8Mo be welded?
Excellent GTAW/GMAW/EB weldability in thick sections with matching or Ti-6211 low-oxygen filler; full inert-gas trailing/backing shielding and interpass cleanliness are mandatory, hydrogen must be kept low.
Can Ti-6Al-2Nb-1Ta-0.8Mo be formed, bent or molded?
Cold formability is limited (bend radii ≥4–5t); hot form at 700–850 °C and beta anneal afterwards for best toughness; avoid iron pickup from tooling.
What surface finishes work on Ti-6Al-2Nb-1Ta-0.8Mo?
Chemically mill/pickle in HNO3-HF to remove alpha case after hot work; anodize (AMS 2488 type) or passivate for service; polishes well but avoid chlorinated residues before heat treatment.
Ti-6Al-2Nb-1Ta-0.8Mo 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 stabiliser | 5.5 – 6.5 | 6 |
| Nb | 1.5 – 2.5 | 2 |
| Ta | 0.6 – 1.4 | 1 |
| Mobeta stabiliser | 0.5 – 1 | 0.8 |
| Fe | ≤ 0.25 | — |
| Okept low for cryogenic toughness | ≤ 0.12 | 0.09 |
| C | ≤ 0.05 | — |
| N | ≤ 0.03 | — |
| H | ≤ 0.01 | — |
| Ti | balance | — |
Ti-6Al-2Nb-1Ta-0.8Mo-STA — frequently asked
What is Ti-6Al-2Nb-1Ta-0.8Mo-STA used for?
Ti-6Al-2Nb-1Ta-0.8Mo-STA is typically used for cryogenic tankage, hydrogen storage vessels and aerospace structures. In short: most weldable near-alpha titanium; tough at cryogenic temperature; hydrogen-compatible structural grade.
What is the yield strength of Ti-6Al-2Nb-1Ta-0.8Mo-STA?
Ti-6Al-2Nb-1Ta-0.8Mo-STA has a typical yield strength of 865 MPa (125 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 74% of titanium grades. Strength varies by condition: see the 3 listed tempers.
Is Ti-6Al-2Nb-1Ta-0.8Mo-STA easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% of titanium grades). Machine like Ti-6Al-4V but slightly softer: rigid setups, sharp uncoated carbide, 25–45 m/min, heavy flood coolant and positive feed to avoid work-hardening and galling.
Can Ti-6Al-2Nb-1Ta-0.8Mo-STA be welded?
Yes — weldability is rated good (65/100). Excellent GTAW/GMAW/EB weldability in thick sections with matching or Ti-6211 low-oxygen filler; full inert-gas trailing/backing shielding and interpass cleanliness are mandatory, hydrogen must be kept low.
What surface finishes work on Ti-6Al-2Nb-1Ta-0.8Mo-STA?
Chemically mill/pickle in HNO3-HF to remove alpha case after hot work; anodize (AMS 2488 type) or passivate for service; polishes well but avoid chlorinated residues before heat treatment.
Can Ti-6Al-2Nb-1Ta-0.8Mo-STA be formed, bent or molded?
Cold formability is limited (bend radii ≥4–5t); hot form at 700–850 °C and beta anneal afterwards for best toughness; avoid iron pickup from tooling.
What is the maximum service temperature of Ti-6Al-2Nb-1Ta-0.8Mo-STA?
Ti-6Al-2Nb-1Ta-0.8Mo-STA is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-6Al-2Nb-1Ta-0.8Mo Annealed and Ti-6Al-2Nb-1Ta-0.8Mo-STA?
Annealed is the default condition — general stocking condition: balanced strength, ductility and weldability for plate and bar. STA: choose when higher strength is needed in thin sections and toughness can be traded down. Yield strength is 780 MPa in Annealed versus 865 MPa in STA.
Sources
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- AMS 2488 — Anodic Treatment of Titanium and Titanium Alloys — SAE International (2019)
- US Naval Research Laboratory reports on Ti-6Al-2Nb-1Ta-0.8Mo plate and weldments — NRL (1985)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.