Titanium Ti-5Al-2.5Fe-STA (Solution treated and aged)
Heat-treated state
ISO 5832-10
Choose for maximum strength and fatigue life in highly loaded hip stems and small-section implants.
Values for the STA condition
Other Ti-5Al-2.5Fe tempers and conditions
Ti-5Al-2.5Fe is listed in 3 conditions; see the grade overview at Ti-5Al-2.5Fe.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed bar/forging (ISO 5832-10 supply condition) | Standard stocked condition for implant bar and forging stock — balanced strength and ductility. | 870 | 950 | 15 | 32 HRC | — |
Cold drawn + stress relieved bar/wire | Small-diameter bar and wire for bone screws and dental posts where straightness, tolerance and higher yield are needed. | 960 | 1,050 | 12 | 35 HRC | 1.1 % IACS |
STAThis page Solution treated and aged | Choose for maximum strength and fatigue life in highly loaded hip stems and small-section implants. | 1,010 | 1,100 | 11 | 37 HRC | 1.1 % IACS |
What is Ti-5Al-2.5Fe-STA?
Ti-5Al-2.5Fe-STA is Ti-5Al-2.5Fe heat treated to STA — choose for maximum strength and fatigue life in highly loaded hip stems and small-section implants. Ti-5Al-2.5Fe-STA has a yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Elongation at break is 11% and the elastic modulus is 112 GPa (16.2 Msi). Ti-5Al-2.5Fe-STA has a density of 4.45 g/cm³ (0.161 lb/in³), lighter than 81% of titanium grades. It melts at 1,600°C (2,912 °F). Annealed is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 98% of titanium grades
- High strength — 1,010 MPa (146 ksi), better than 93% of titanium grades
Limitations
- Limited formability — 15/100, worse than 93% of titanium grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 90% of titanium grades
- Difficult to weld — 50/100, worse than 89% of titanium grades
- Limited ductility — 11%, worse than 87% of titanium grades
Ti-5Al-2.5Fe-STA properties
Typical room-temperature values for Ti-5Al-2.5Fe-STA; 22 are specific to this condition. Other listed values are Ti-5Al-2.5Fe reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-5Al-2.5Fe-STA has a density of 4.45 g/cm³ (0.161 lb/in³), lighter than 81% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical16
Ti-5Al-2.5Fe-STA has a yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Elongation at break is 11% and the elastic modulus is 112 GPa (16.2 Msi).
Thermal6
Ti-5Al-2.5Fe-STA is rated for continuous service to 300°C (572 °F). It conducts heat at 7.5 W/m·K (4.33 BTU/hr·ft·°F), worse than 65% of titanium grades. Thermal expansion is 9.5 µm/m·K (5.28 µin/in·°F).
Electrical3
Ti-5Al-2.5Fe-STA conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (91/100), worse than 58% of titanium grades.
Sustainability4
Producing a kilogram of Ti-5Al-2.5Fe-STA takes about 700 MJ of energy and emits 42 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 15%.
Manufacturability8
Ti-5Al-2.5Fe-STA's machinability is poor (16/100, worse than 93% of titanium grades); weldability fair (50/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-5Al-2.5Fe-STA
Is Ti-5Al-2.5Fe easy to machine?
Machine like Ti-6Al-4V: rigid setups, sharp uncoated-carbide or PVD tools, 25–45 m/min, heavy flood coolant, constant feed to avoid work hardening and titanium fires from fine chips.
Can Ti-5Al-2.5Fe be welded?
GTAW/EBW/laser with full inert (trailing + backing) shielding gives sound joints; keep interpass temperature low and expect some Fe segregation and strength loss in the fusion zone — post-weld stress relief at 550–600 °C recommended.
Can Ti-5Al-2.5Fe be formed, bent or molded?
Cold formability is limited; hot forge/roll in the 850–950 °C α+β range (β transus ≈ 960–980 °C) with controlled cooling to develop a fine bimodal microstructure.
What surface finishes work on Ti-5Al-2.5Fe?
Polishes to a mirror finish; anodizes readily for colour coding and biocompatible oxide layers; grit-blast/acid-etch or plasma-spray HA for osseointegration surfaces; avoid chlorinated or fluoride-containing cleaners.
Ti-5Al-2.5Fe 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 | 4.5 – 5.5 | 5 |
| Feβ stabilizer replacing V | 2 – 3 | 2.5 |
| Ointerstitial, controls strength | ≤ 0.2 | 0.15 |
| N | ≤ 0.05 | 0.02 |
| C | ≤ 0.08 | 0.03 |
| Hlower limits (0.0125 %) often specified for bar | ≤ 0.02 | 0.01 |
| Other, each | ≤ 0.1 | — |
| Other, total | ≤ 0.4 | — |
| Ti | balance | — |
Ti-5Al-2.5Fe-STA — frequently asked
What is Ti-5Al-2.5Fe-STA used for?
Ti-5Al-2.5Fe-STA is typically used for hip stems, dental implants and orthopedic devices. In short: iron-stabilized implant titanium; vanadium-free Ti-6Al-4V substitute.
What is the yield strength of Ti-5Al-2.5Fe-STA?
Ti-5Al-2.5Fe-STA has a typical yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Strength varies by condition: see the 3 listed tempers.
Is Ti-5Al-2.5Fe-STA easy to machine?
Not especially — machinability is rated poor (16/100, worse than 93% of titanium grades). Machine like Ti-6Al-4V: rigid setups, sharp uncoated-carbide or PVD tools, 25–45 m/min, heavy flood coolant, constant feed to avoid work hardening and titanium fires from fine chips.
Can Ti-5Al-2.5Fe-STA be welded?
With care — weldability is rated fair (50/100). GTAW/EBW/laser with full inert (trailing + backing) shielding gives sound joints; keep interpass temperature low and expect some Fe segregation and strength loss in the fusion zone — post-weld stress relief at 550–600 °C recommended.
What surface finishes work on Ti-5Al-2.5Fe-STA?
Polishes to a mirror finish; anodizes readily for colour coding and biocompatible oxide layers; grit-blast/acid-etch or plasma-spray HA for osseointegration surfaces; avoid chlorinated or fluoride-containing cleaners.
Can Ti-5Al-2.5Fe-STA be formed, bent or molded?
Cold formability is limited; hot forge/roll in the 850–950 °C α+β range (β transus ≈ 960–980 °C) with controlled cooling to develop a fine bimodal microstructure.
What is the maximum service temperature of Ti-5Al-2.5Fe-STA?
Ti-5Al-2.5Fe-STA is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-5Al-2.5Fe Annealed and Ti-5Al-2.5Fe-STA?
Annealed is the default condition — standard stocked condition for implant bar and forging stock — balanced strength and ductility. STA: choose for maximum strength and fatigue life in highly loaded hip stems and small-section implants. Yield strength is 870 MPa in Annealed versus 1,010 MPa in STA.
Sources
- ISO 5832-10 Implants for surgery — Metallic materials — Part 10: Wrought titanium 5-aluminium 2.5-iron alloy — ISO (1996)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Materials and Coatings for Medical Devices: Cardiovascular / Handbook of Materials for Medical Devices — ASM International (2003)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
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.