Titanium Ti-8Mo-8V-2Fe-3Al-STA (Solution treated and aged)
Heat-treated state · default condition
Standard delivery condition for structural forgings needing 1200–1400 MPa strength.
Values for the STA condition
Other Ti-8Mo-8V-2Fe-3Al tempers and conditions
Ti-8Mo-8V-2Fe-3Al is listed in 4 conditions; see the grade overview at Ti-8Mo-8V-2Fe-3Al.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Pick for maximum ductility/formability and for machining or welding before final aging. | 860 | 900 | 16 | 30 HRC | — |
As fabricated | Rough forging stock supplied for customer-controlled solution treatment and aging. | 940 | 1,000 | 10 | 33 HRC | 1.1 % IACS |
Solution treated and overaged | Pick when damage tolerance / K_IC matters more than peak strength (landing-gear type forgings). | 1,060 | 1,130 | 11 | 36 HRC | — |
STADefaultThis page Solution treated and aged | Standard delivery condition for structural forgings needing 1200–1400 MPa strength. | 1,240 | 1,300 | 8 | 40 HRC | — |
What is Ti-8Mo-8V-2Fe-3Al-STA?
Ti-8Mo-8V-2Fe-3Al-STA is Ti-8Mo-8V-2Fe-3Al heat treated to STA — standard delivery condition for structural forgings needing 1200–1400 MPa strength. Ti-8Mo-8V-2Fe-3Al-STA has a yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 100% of titanium grades. Elongation at break is 8% and the elastic modulus is 110 GPa (16 Msi). Ti-8Mo-8V-2Fe-3Al-STA has a density of 4.9 g/cm³ (0.177 lb/in³), heavier than 96% of titanium grades. It melts at 1,600°C (2,912 °F).
Advantages
- High strength — 1,240 MPa (180 ksi), better than 100% of titanium grades
Limitations
- Difficult to machine — 14/100, worse than 100% of titanium grades
- Limited ductility — 8%, worse than 99% of titanium grades
- Poor heat conductor — 6.5 W/m·K (3.76 BTU/hr·ft·°F), worse than 99% of titanium grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 98% of titanium grades
- Difficult to weld — 35/100, worse than 96% of titanium grades
Ti-8Mo-8V-2Fe-3Al-STA properties
Typical room-temperature values for Ti-8Mo-8V-2Fe-3Al-STA; 16 are specific to this condition. Other listed values are Ti-8Mo-8V-2Fe-3Al reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-8Mo-8V-2Fe-3Al-STA has a density of 4.9 g/cm³ (0.177 lb/in³), heavier than 96% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical15
Ti-8Mo-8V-2Fe-3Al-STA has a yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 100% of titanium grades. Elongation at break is 8% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
Ti-8Mo-8V-2Fe-3Al-STA is rated for continuous service to 315°C (599 °F). It conducts heat at 6.5 W/m·K (3.76 BTU/hr·ft·°F), worse than 99% of titanium grades. Thermal expansion is 9.2 µm/m·K (5.11 µin/in·°F).
Electrical3
Ti-8Mo-8V-2Fe-3Al-STA conducts electricity at 1.2 % IACS, worse than 55% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), worse than 93% of titanium grades.
Sustainability4
Producing a kilogram of Ti-8Mo-8V-2Fe-3Al-STA takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 30%.
Manufacturability6
Ti-8Mo-8V-2Fe-3Al-STA's machinability is not recommended (14/100, worse than 100% of titanium grades); weldability fair (35/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-8Mo-8V-2Fe-3Al-STA
Is Ti-8Mo-8V-2Fe-3Al easy to machine?
Machine in the ST/annealed condition where possible: rigid setups, 15–30 m/min carbide surface speed, heavy flood coolant, positive rake and constant feed to avoid work-hardened glaze; aged material cuts like 45 HRC steel with titanium's poor heat conduction.
Can Ti-8Mo-8V-2Fe-3Al be welded?
GTAW/plasma/EBW with full inert shielding or vacuum in the solution-treated condition, then solution treat + age the assembly; welding aged material locally overages and embrittles the HAZ.
Can Ti-8Mo-8V-2Fe-3Al be formed, bent or molded?
Beta-forge just below/around the 770–790 °C transus with controlled cooling; cold or warm forming is practical only in the freshly solution-treated (metastable beta) state, then age to strength.
What surface finishes work on Ti-8Mo-8V-2Fe-3Al?
Chemical mill or grit blast plus pickle to remove alpha case; anodize (AMS 2488-type) or apply ion/plasma nitride or MoS₂/dry-film lube for galling control; takes a good mechanical polish but avoid HF-containing chemistries.
Ti-8Mo-8V-2Fe-3Al 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 / strengthener | 2.6 – 3.4 | 3 |
| Mobeta stabiliser | 7.5 – 8.5 | 8 |
| Vbeta stabiliser | 7.5 – 8.5 | 8 |
| Festrong, low-cost beta stabiliser; segregation-sensitive | 1.6 – 2.4 | 2 |
| Ointerstitial, max | ≤ 0.14 | 0.11 |
| C | ≤ 0.05 | — |
| N | ≤ 0.05 | — |
| Hmax (bar/forging) | ≤ 0.02 | — |
| Other, eachresiduals | ≤ 0.1 | — |
| Other, totalresiduals | ≤ 0.4 | — |
| Ti | balance | — |
Ti-8Mo-8V-2Fe-3Al-STA — frequently asked
What is Ti-8Mo-8V-2Fe-3Al-STA used for?
Ti-8Mo-8V-2Fe-3Al-STA is typically used for structural aerospace forgings, landing gear components, wing and fuselage fittings, actuator bodies and rods, hinge and lug fittings and high-strength fastener stock. In short: highest-strength beta forging alloy; 1300 MPa tensile after aging; low formability and weldability.
What is the yield strength of Ti-8Mo-8V-2Fe-3Al-STA?
Ti-8Mo-8V-2Fe-3Al-STA has a typical yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 100% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti-8Mo-8V-2Fe-3Al-STA easy to machine?
Not especially — machinability is rated not recommended (14/100, worse than 100% of titanium grades). Machine in the ST/annealed condition where possible: rigid setups, 15–30 m/min carbide surface speed, heavy flood coolant, positive rake and constant feed to avoid work-hardened glaze; aged material cuts like 45 HRC steel with titanium's poor heat conduction.
Can Ti-8Mo-8V-2Fe-3Al-STA be welded?
With care — weldability is rated fair (35/100). GTAW/plasma/EBW with full inert shielding or vacuum in the solution-treated condition, then solution treat + age the assembly; welding aged material locally overages and embrittles the HAZ.
What surface finishes work on Ti-8Mo-8V-2Fe-3Al-STA?
Chemical mill or grit blast plus pickle to remove alpha case; anodize (AMS 2488-type) or apply ion/plasma nitride or MoS₂/dry-film lube for galling control; takes a good mechanical polish but avoid HF-containing chemistries.
Can Ti-8Mo-8V-2Fe-3Al-STA be formed, bent or molded?
Beta-forge just below/around the 770–790 °C transus with controlled cooling; cold or warm forming is practical only in the freshly solution-treated (metastable beta) state, then age to strength.
What is the maximum service temperature of Ti-8Mo-8V-2Fe-3Al-STA?
Ti-8Mo-8V-2Fe-3Al-STA 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-8Mo-8V-2Fe-3Al-STA and Ti-8Mo-8V-2Fe-3Al-ST?
STA is the default condition — standard delivery condition for structural forgings needing 1200–1400 MPa strength. ST: pick for maximum ductility/formability and for machining or welding before final aging. Yield strength is 1,240 MPa in STA versus 860 MPa in ST.
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)
- Titanium: A Technical Guide, 2nd ed. — ASM International (2000)
- AMS 2488 — Anodic Treatment of Titanium and Titanium Alloys — SAE International (2019)
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.