Titanium Ti-6242 · heat-treated state
Titanium Ti-6242-STA
Properties of the STA condition, compared with the other Ti-6242 tempers.
Pick for maximum room- and mid-temperature strength in forgings and bar, accepting lower ductility and toughness.
What is Ti-6242-STA?
Ti-6242-STA is Ti-6242 heat treated to STA — pick for maximum room- and mid-temperature strength in forgings and bar, accepting lower ductility and toughness. Ti-6242-STA has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Elongation at break is 12% and the elastic modulus is 114 GPa (16.5 Msi). Ti-6242-STA has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,650°C (3,002 °F). O is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- High service temperature — 510°C (950 °F), better than 96% of titanium grades
- High strength — 1,000 MPa (145 ksi), better than 93% of titanium grades
Limitations
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 96% of titanium grades
- Difficult to weld — 60/100, worse than 83% of titanium grades
- Limited ductility — 12%, worse than 78% of titanium grades
Ti-6242-STA properties
Typical room-temperature values for Ti-6242-STA — 10 properties are specific to this condition; the rest are grade-level values shared by every Ti-6242 temper. Each bar shows where the value sits among the titanium grades in FabDigit's library — further right is higher.
Physical3
Ti-6242-STA has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical16
Ti-6242-STA has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Elongation at break is 12% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti-6242-STA is rated for continuous service to 510°C (950 °F). It conducts heat at 7 W/m·K (4.04 BTU/hr·ft·°F), worse than 76% of titanium grades. Thermal expansion is 7.7 µm/m·K (4.28 µin/in·°F).
Electrical3
Ti-6242-STA conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), worse than 93% of titanium grades.
Sustainability4
Producing a kilogram of Ti-6242-STA takes about 650 MJ of energy and emits 44 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 30%.
Manufacturability8
Ti-6242-STA's machinability is poor (15/100, worse than 97% of titanium grades); weldability good (60/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Ti-6242 tempers and conditions
Ti-6242 is also supplied in 5 other conditions. The full side-by-side table is on the Ti-6242 overview.
- ODefaultDefault stocked bar, billet and plate condition — balanced strength and ductility for general elevated-temperature parts.930 MPa yield · 32 HRC
- STAPick for maximum room- and mid-temperature strength in forgings and bar, accepting lower ductility and toughness.1,000 MPa yield · 35 HRC
- Duplex AnnealedStandard aerospace sheet/plate/bar condition; best combination of creep resistance, thermal stability and toughness.940 MPa yield · 33 HRC
- Beta AnnealedChoose for maximum fracture toughness, creep and crack-growth resistance in thick engine hardware; tensile ductility and fatigue are lower.895 MPa yield · 32 HRC
Working with Ti-6242-STA
Is Ti-6242 easy to machine?
Machine like Ti-6Al-4V but slower: rigid setup, sharp uncoated carbide, 20–35 m/min turning, heavy flood coolant, positive rake and no dwell to avoid work-hardening and fire risk in fine chips.
Can Ti-6242 be welded?
GTAW, plasma, EB and laser welding are practical with full inert gas/vacuum shielding and clean surfaces; post-weld stress relief (540–650 °C) is normal and weld ductility is lower than Ti-6Al-4V.
Can Ti-6242 be formed, bent or molded?
Cold formability is poor — form warm (480–650 °C) or hot; sheet supports hot sizing and superplastic-type forming at ~870–900 °C with generous bend radii (≥4–5 t cold).
What surface finishes work on Ti-6242?
Chemical mill or pickle in HNO₃/HF to remove alpha case after hot work; shot peen fatigue-critical surfaces; colour or anti-gall anodise (AMS 2488) and avoid Cd/Hg-bearing platings and chlorinated residues.
Ti-6242 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 | 5.5 – 6.5 | 6 |
| Sn | 1.8 – 2.2 | 2 |
| Zr | 3.6 – 4.4 | 4 |
| Mo | 1.8 – 2.2 | 2 |
| Sionly in the Ti-6242S creep-optimised variant; ≤0.05 in plain Ti-6242 | 0.06 – 0.1 | 0.08 |
| Fe | ≤ 0.25 | — |
| O | ≤ 0.15 | 0.1 |
| C | ≤ 0.05 | — |
| N | ≤ 0.05 | — |
| Hmax (0.015 for bar/billet per some specs) | ≤ 0.01 | — |
| Ymax, aerospace melt cleanliness | ≤ 0.01 | — |
| Other, eachtotal 0.40 max | ≤ 0.1 | — |
| Ti | balance | — |
Ti-6242-STA — frequently asked
What is Ti-6242-STA used for?
Ti-6242-STA is typically used for jet-engine compressor blades, compressor discs and spacers, engine casings and static rings, hot-section sheet ducting and nacelle parts, airframe skins near engine exhausts and high-temperature fasteners. In short: high-temp aerospace titanium.
What is the yield strength of Ti-6242-STA?
Ti-6242-STA has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 93% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is Ti-6242-STA easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% of titanium grades). Machine like Ti-6Al-4V but slower: rigid setup, sharp uncoated carbide, 20–35 m/min turning, heavy flood coolant, positive rake and no dwell to avoid work-hardening and fire risk in fine chips.
Can Ti-6242-STA be welded?
Yes — weldability is rated good (60/100). GTAW, plasma, EB and laser welding are practical with full inert gas/vacuum shielding and clean surfaces; post-weld stress relief (540–650 °C) is normal and weld ductility is lower than Ti-6Al-4V.
What surface finishes work on Ti-6242-STA?
Chemical mill or pickle in HNO₃/HF to remove alpha case after hot work; shot peen fatigue-critical surfaces; colour or anti-gall anodise (AMS 2488) and avoid Cd/Hg-bearing platings and chlorinated residues.
Can Ti-6242-STA be formed, bent or molded?
Cold formability is poor — form warm (480–650 °C) or hot; sheet supports hot sizing and superplastic-type forming at ~870–900 °C with generous bend radii (≥4–5 t cold).
What is the maximum service temperature of Ti-6242-STA?
Ti-6242-STA is rated for continuous use to about 510°C (950 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-6242-O and Ti-6242-STA?
O is the default condition — default stocked bar, billet and plate condition — balanced strength and ductility for general elevated-temperature parts. STA: pick for maximum room- and mid-temperature strength in forgings and bar, accepting lower ductility and toughness. Yield strength is 930 MPa in O versus 1,000 MPa in STA.
Can FabDigit make parts in Ti-6242-STA?
Yes — Ti-6242-STA is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- AMS 4975 — Ti-6Al-2Sn-4Zr-2Mo bar, forgings, duplex annealed — SAE International (2018)
- AMS 4919 — Ti-6Al-2Sn-4Zr-2Mo sheet, strip and plate, duplex annealed — SAE International (2017)
- ASTM B381 / UNS R54620 titanium forgings — ASTM International (2022)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- MMPDS metallic materials properties (Ti-6242 typical values) — Battelle/FAA (2023)
- TIMETAL 6-2-4-2 alloy datasheet — TIMET (2020)
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.