Titanium Ti-6242
UNS R54620, R56401 · AISI/SAE 4975/4919 · EN 3.7145
Ti-6242 (Ti-6Al-2Sn-4Zr-2Mo, UNS R54620, 3.7145, AMS 4975/4919) is a near-alpha titanium alloy that keeps useful strength and creep resistance up to about 450 °C, with a maximum service temperature of 540 °C.
Values for the O condition
Ti-6242 tempers and conditions
Ti-6242 is supplied in 6 conditions, soft to hard. O is the default FabDigit quotes; the values on this page are for it.
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 | — |
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?
Ti-6242 (Ti-6Al-2Sn-4Zr-2Mo, UNS R54620, 3.7145, AMS 4975/4919) is a near-alpha titanium alloy that keeps useful strength and creep resistance up to about 450 °C, with a maximum service temperature of 540 °C. It is supplied as forgings, bar, plate and sheet for jet-engine compressor hardware, giving 930 MPa yield, 1000 MPa tensile, 14% elongation and 32 HRC in the default condition, with duplex, triplex, beta-annealed and STA conditions on file. Machinability is very poor (score 18) and cold formability is limited, so warm or hot forming is normal. Ti-6Al-4V is the alternative below about 350 °C where cost and machinability matter more than creep strength. Ti-6242 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). Ti-6242 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 14% and the elastic modulus is 114 GPa (16.5 Msi).
What is Ti-6242 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
- High-temperature fasteners
- Impellers and rotating rings
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
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 83% of titanium grades
- Difficult to weld — 60/100, worse than 83% of titanium grades
Ti-6242 properties
Typical room-temperature values for Ti-6242-O; bars are the position among titanium grades.
Physical3
Ti-6242 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 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 14% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti-6242 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 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 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's machinability is poor (18/100, worse than 83% of titanium grades); weldability good (60/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. Ti-6242 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-6242
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).
Manufacturability
The process limits FabDigit's quote engine applies to Ti-6242. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Fair18 / 100 |
|---|---|
| ISO material group | S.3 |
| Cutting speed (rough / finish) | 60 / 75 m/min |
| Minimum wall | 1 mm |
| Minimum internal radius | 1.5 mm |
| Drill depth limit | 4× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair25 / 100 |
|---|---|
| Weldability | Good60 / 100 |
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 |
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.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Conversion Coating
Organic Coating
CVD Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium Ti-6242 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R54620R56401
- AISI / SAE
- 4975/4919
- EN / DIN / Werkstoff-Nr.
- 3.7145
- Also called
- Ti 6242
How much does Ti-6242 cost?
Ti-6242 is a specialty-cost titanium ($$$$$), pricier than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Ti-6242 — frequently asked
What is Ti-6242 used for?
Ti-6242 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?
Ti-6242 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 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 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?
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 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?
Ti-6242 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.
How much does Ti-6242 cost?
Ti-6242 is a specialty-cost titanium ($$$$$), pricier than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in Ti-6242?
Yes — Ti-6242 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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.