Titanium Ti-6242 Triplex Annealed
Heat-treated state
UNS R54620, R56401 · AISI/SAE 4975/4919 · EN 3.7145
Disc and large-forging condition tuned to balance creep, dwell-fatigue and toughness requirements.
Values for the Triplex Annealed condition
Other Ti-6242 tempers and conditions
Ti-6242 is listed in 6 conditions; see the grade overview at Ti-6242.
- Beta Annealed
- O
- Triplex Annealed
- Duplex Annealed
- Stress Relieved
- STA
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
annealed above β transus (~1010 °C), cooled, then stabilised | Choose for maximum fracture toughness, creep and crack-growth resistance in thick engine hardware; tensile ductility and fatigue are lower. | 895 | 965 | 11 | 32 HRC | 1.1 % IACS |
ODefault Annealed | Default stocked bar, billet and plate condition — balanced strength and ductility for general elevated-temperature parts. | 930 | 1,000 | 14 | 32 HRC | — |
Triplex AnnealedThis page three-step anneal for forgings/discs (β-processed then two sub-transus steps) | Disc and large-forging condition tuned to balance creep, dwell-fatigue and toughness requirements. | 930 | 1,000 | 13 | 32 HRC | 1.1 % IACS |
~900 °C then ~790 °C stabilising anneal (AMS 4975/4976 sheet, bar) | Standard aerospace sheet/plate/bar condition; best combination of creep resistance, thermal stability and toughness. | 940 | 1,010 | 15 | 33 HRC | — |
540–650 °C short hold after welding/machining | Use after welding, heavy machining or forming to remove residual stress without changing microstructure. | 940 | 1,010 | 14 | 33 HRC | 1.1 % IACS |
Solution treated and aged | Pick for maximum room- and mid-temperature strength in forgings and bar, accepting lower ductility and toughness. | 1,000 | 1,100 | 12 | 35 HRC | — |
What is Ti-6242 Triplex Annealed?
Ti-6242 Triplex Annealed is Ti-6242 heat treated to Triplex Annealed — disc and large-forging condition tuned to balance creep, dwell-fatigue and toughness requirements. Ti-6242 Triplex Annealed has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 13% and the elastic modulus is 114 GPa (16.5 Msi). Ti-6242 Triplex Annealed 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; Triplex Annealed is available on request or by drawing note.
Advantages
- High service temperature — 540°C (1,004 °F), better than 98% of titanium grades
- High strength — 930 MPa (135 ksi), better than 86% of titanium grades
Limitations
- Difficult to weld — 60/100, worse than 83% of titanium grades
- Limited formability — 22/100, worse than 78% of titanium grades
Ti-6242 Triplex Annealed properties
Typical room-temperature values for Ti-6242 Triplex Annealed; 22 are specific to this condition. Other listed values are Ti-6242 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-6242 Triplex Annealed 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 Triplex Annealed has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 13% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti-6242 Triplex Annealed is rated for continuous service to 540°C (1,004 °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 Triplex Annealed 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 Triplex Annealed 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 Triplex Annealed's machinability is poor (18/100, worse than 83% of titanium grades); weldability good (60/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-6242 Triplex Annealed
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 Triplex Annealed — frequently asked
What is Ti-6242 Triplex Annealed used for?
Ti-6242 Triplex Annealed 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 Triplex Annealed?
Ti-6242 Triplex Annealed has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is Ti-6242 Triplex Annealed easy to machine?
Not especially — machinability is rated poor (18/100, worse than 83% 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 Triplex Annealed 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 Triplex Annealed?
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 Triplex Annealed 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 Triplex Annealed?
Ti-6242 Triplex Annealed is rated for continuous use to about 540°C (1,004 °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 Triplex Annealed?
Yes — Ti-6242 Triplex Annealed 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.