Titanium Ti-8Al-1Mo-1V-STA (Solution treated and aged)
Heat-treated state
UNS R54810 · GB TA11
Used on thin sections needing the highest room-temperature strength; toughness and thermal stability are reduced versus duplex anneal.
Values for the STA condition
Other Ti-8Al-1Mo-1V tempers and conditions
Ti-8Al-1Mo-1V is listed in 4 conditions; see the grade overview at Ti-8Al-1Mo-1V.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Single Annealed | Sheet condition chosen when maximum ductility and forming/flatness are more important than creep strength. | 900 | 965 | 17 | 31 HRC | 0.9 % IACS |
Mill Annealed | Lowest-cost stocking condition for general bar and plate where full duplex-anneal creep certification is not required. | 925 | 985 | 16 | 32 HRC | 0.9 % IACS |
DADefault Duplex Annealed | Standard aerospace supply condition for sheet, bar and forgings (AMS 4915/4972): best balance of strength, creep resistance and toughness. | 950 | 1,000 | 15 | 33 HRC | — |
STAThis page Solution treated and aged | Used on thin sections needing the highest room-temperature strength; toughness and thermal stability are reduced versus duplex anneal. | 1,030 | 1,100 | 11 | 36 HRC | — |
What is Ti-8Al-1Mo-1V-STA?
Ti-8Al-1Mo-1V-STA is Ti-8Al-1Mo-1V heat treated to STA — used on thin sections needing the highest room-temperature strength; toughness and thermal stability are reduced versus duplex anneal. Ti-8Al-1Mo-1V-STA has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 95% of titanium grades. Elongation at break is 11% and the elastic modulus is 124 GPa (18 Msi). Ti-8Al-1Mo-1V-STA has a density of 4.37 g/cm³ (0.158 lb/in³), lighter than 99% of titanium grades. It melts at 1,540°C (2,804 °F). DA is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- Stiff — 124 GPa (18 Msi), better than 100% of titanium grades
- High strength — 1,030 MPa (149 ksi), better than 95% of titanium grades
- High service temperature — 425°C (797 °F), better than 85% of titanium grades
Limitations
- Poor heat conductor — 6.5 W/m·K (3.76 BTU/hr·ft·°F), worse than 99% of titanium grades
- Low electrical conductivity — 0.9 % IACS, worse than 99% of titanium grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 90% of titanium grades
- Limited ductility — 11%, worse than 87% of titanium grades
- Difficult to weld — 55/100, worse than 87% of titanium grades
Ti-8Al-1Mo-1V-STA properties
Typical room-temperature values for Ti-8Al-1Mo-1V-STA; 10 are specific to this condition. Other listed values are Ti-8Al-1Mo-1V reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-8Al-1Mo-1V-STA has a density of 4.37 g/cm³ (0.158 lb/in³), lighter than 99% of titanium grades. It melts at 1,540°C (2,804 °F).
Mechanical16
Ti-8Al-1Mo-1V-STA has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 95% of titanium grades. Elongation at break is 11% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
Ti-8Al-1Mo-1V-STA is rated for continuous service to 425°C (797 °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 8.5 µm/m·K (4.72 µin/in·°F).
Electrical3
Ti-8Al-1Mo-1V-STA conducts electricity at 0.9 % IACS, worse than 99% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), worse than 93% of titanium grades.
Sustainability4
Producing a kilogram of Ti-8Al-1Mo-1V-STA takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability7
Ti-8Al-1Mo-1V-STA's machinability is poor (15/100, worse than 97% of titanium grades); weldability good (55/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-8Al-1Mo-1V-STA
Is Ti-8Al-1Mo-1V easy to machine?
Machine like a hard Ti alloy: rigid setup, sharp uncoated-carbide or PVD tools, 20–35 m/min, heavy flood coolant, positive rake and no dwelling to avoid work hardening and fire risk from fine chips.
Can Ti-8Al-1Mo-1V be welded?
GTAW/EBW/laser weldable with full inert shielding and trailing gas; weld metal ordered α₂-embrittles, so stress relieve 540–650 °C and avoid highly restrained joints in creep-loaded parts.
Can Ti-8Al-1Mo-1V be formed, bent or molded?
Cold formability is poor (bend radii ≥4–5 t); hot form or size at 700–870 °C, and forge at 900–980 °C for duplex-anneal microstructure or above the ~1040 °C β transus for beta-annealed parts.
What surface finishes work on Ti-8Al-1Mo-1V?
Chemical mill / pickle in HNO3-HF to remove alpha case after hot work; shot-peen for fatigue, anodize per AMS 2488 or apply dry-film lube for galling and fretting control.
Ti-8Al-1Mo-1V 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 |
|---|---|---|
| Al | 7.35 – 8.35 | 8 |
| Mo | 0.75 – 1.25 | 1 |
| V | 0.75 – 1.25 | 1 |
| Fe | ≤ 0.3 | 0.1 |
| O | ≤ 0.12 | 0.08 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.05 | 0.01 |
| Hmax, product-form dependent (0.0125–0.015) | ≤ 0.02 | 0.01 |
| Ymax, when specified | ≤ 0.01 | — |
| Other, each | ≤ 0.1 | — |
| Other, total | ≤ 0.4 | — |
| Ti | balance | — |
Ti-8Al-1Mo-1V-STA — frequently asked
What is Ti-8Al-1Mo-1V-STA used for?
Ti-8Al-1Mo-1V-STA is typically used for jet engine compressor blades, compressor discs and high-temp airframe skins. In short: highest-modulus near-alpha titanium; creep resistant to 450 °C; difficult to machine.
What is the yield strength of Ti-8Al-1Mo-1V-STA?
Ti-8Al-1Mo-1V-STA has a typical yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 95% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti-8Al-1Mo-1V-STA easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% of titanium grades). Machine like a hard Ti alloy: rigid setup, sharp uncoated-carbide or PVD tools, 20–35 m/min, heavy flood coolant, positive rake and no dwelling to avoid work hardening and fire risk from fine chips.
Can Ti-8Al-1Mo-1V-STA be welded?
Yes — weldability is rated good (55/100). GTAW/EBW/laser weldable with full inert shielding and trailing gas; weld metal ordered α₂-embrittles, so stress relieve 540–650 °C and avoid highly restrained joints in creep-loaded parts.
What surface finishes work on Ti-8Al-1Mo-1V-STA?
Chemical mill / pickle in HNO3-HF to remove alpha case after hot work; shot-peen for fatigue, anodize per AMS 2488 or apply dry-film lube for galling and fretting control.
Can Ti-8Al-1Mo-1V-STA be formed, bent or molded?
Cold formability is poor (bend radii ≥4–5 t); hot form or size at 700–870 °C, and forge at 900–980 °C for duplex-anneal microstructure or above the ~1040 °C β transus for beta-annealed parts.
What is the maximum service temperature of Ti-8Al-1Mo-1V-STA?
Ti-8Al-1Mo-1V-STA is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-8Al-1Mo-1V-DA and Ti-8Al-1Mo-1V-STA?
DA is the default condition — standard aerospace supply condition for sheet, bar and forgings (AMS 4915/4972): best balance of strength, creep resistance and toughness. STA: used on thin sections needing the highest room-temperature strength; toughness and thermal stability are reduced versus duplex anneal. Yield strength is 950 MPa in DA versus 1,030 MPa in STA.
Sources
- AMS 4915 — Titanium Alloy Sheet, Strip and Plate 8Al-1Mo-1V, Duplex Annealed — SAE International (2018)
- AMS 4916 — Titanium Alloy Sheet 8Al-1Mo-1V, Single Annealed — SAE International (2018)
- AMS 4972/4973 — Titanium Alloy Bar and Forgings 8Al-1Mo-1V — SAE International (2017)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- MMPDS — Metallic Materials Properties Development and Standardization, Ti-8Al-1Mo-1V chapter — Battelle/FAA (2023)
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.