Titanium Ti-6Al-2Sn-4Zr-2Mo-0.1Si
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is the silicon-modified variant of Ti-6242, a near-alpha titanium alloy in which the silicon addition raises creep resistance for hot-section aero-engine hardware.
Reference datasheet — Ti-6Al-2Sn-4Zr-2Mo-0.1Si is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Duplex Annealed condition
Ti-6Al-2Sn-4Zr-2Mo-0.1Si tempers and conditions
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is supplied in 7 conditions, soft to hard. Duplex Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
heated above beta transus (~1010–1040 °C), cooled, then stabilised | Transformed (Widmanstätten/basketweave) structure for maximum fracture toughness, creep and crack-growth resistance in discs and casings. | 890 | 970 | 12 | 32 HRC | 0.87 % IACS |
beta solution treated, cooled and overaged/stabilised (~595–650 °C) | Used for creep- and dwell-fatigue-critical engine hardware where dimensional stability after long hot exposure matters. | 900 | 1,000 | 11 | 33 HRC | 0.87 % IACS |
As-welded (GTAW/EBW joint, post-weld stress relief 540–650 °C) | Reference condition for fusion-welded rings and cases; joint strength approaches base metal but ductility drops. | 900 | 980 | 8 | 33 HRC | 0.87 % IACS |
790–815 °C, 1–2 h, air cool | Cheaper as-supplied condition for sheet and plate where full creep optimisation is not required. | 910 | 1,000 | 14 | 31 HRC | 0.87 % IACS |
As-forged + duplex annealed | Typical supply condition for compressor discs, impellers and rings forged below the beta transus. | 925 | 1,000 | 14 | 32 HRC | 0.87 % IACS |
Duplex AnnealedDefault 900–925 °C air cool + 790 °C/8 h stabilise | Standard stocked condition for bar, billet, forgings and sheet: balanced strength, ductility and creep life. | 930 | 1,010 | 15 | 32 HRC | — |
Solution treated and aged | Choose when peak room- and mid-temperature strength is needed in thinner sections, accepting lower toughness. | 1,000 | 1,100 | 12 | 35 HRC | — |
What is Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is the silicon-modified variant of Ti-6242, a near-alpha titanium alloy in which the silicon addition raises creep resistance for hot-section aero-engine hardware. Duplex-annealed material gives 930 MPa yield, 1010 MPa tensile, 15% elongation and about 32 HRC, with service to 510 °C, and it is available duplex or mill annealed, STA, beta annealed, beta STOA, and as forged-plus-annealed stock. Cold formability (score 25) and machinability (18) are both low, so parts are hot formed and forged below the beta transus. Ti-8Al-1Mo-1V is the lower-temperature near-alpha alternative. Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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-6Al-2Sn-4Zr-2Mo-0.1Si has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 86% of titanium grades. Elongation at break is 15% and the elastic modulus is 114 GPa (16.5 Msi).
What is Ti-6Al-2Sn-4Zr-2Mo-0.1Si used for?
- Turbine engine compressor discs
- Compressor blades and blisks
- Engine casings and spacer rings
- Forged rings and shafts for engines
- High-temperature airframe structure
- Sheet-metal exhaust and nozzle structures
- Hot-air ducting components
Advantages
- High service temperature — 510°C (950 °F), better than 96% of titanium grades
- High strength — 930 MPa (135 ksi), better than 86% of titanium grades
Limitations
- Low electrical conductivity — 0.87 % IACS, worse than 100% of titanium grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 90% of titanium grades
- Difficult to weld — 65/100, worse than 77% of titanium grades
Ti-6Al-2Sn-4Zr-2Mo-0.1Si properties
Typical room-temperature values for Ti-6Al-2Sn-4Zr-2Mo-0.1Si-Duplex Annealed; bars are the position among titanium grades.
Physical3
Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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-6Al-2Sn-4Zr-2Mo-0.1Si has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 86% of titanium grades. Elongation at break is 15% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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-6Al-2Sn-4Zr-2Mo-0.1Si conducts electricity at 0.87 % IACS, worse than 100% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), worse than 93% of titanium grades.
Sustainability4
Producing a kilogram of Ti-6Al-2Sn-4Zr-2Mo-0.1Si takes about 680 MJ of energy and emits 40 kg of CO₂ — more than 51% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti-6Al-2Sn-4Zr-2Mo-0.1Si's machinability is poor (18/100, worse than 83% of titanium grades); weldability good (65/100); 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-6Al-2Sn-4Zr-2Mo-0.1Si is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-6Al-2Sn-4Zr-2Mo-0.1Si
Is Ti-6Al-2Sn-4Zr-2Mo-0.1Si easy to machine?
Machine like a tough near-alpha Ti: rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (~20–40 m/min), heavy positive feed, flood high-pressure coolant, never dwell — work-hardened smearing and chip fires are the main risks.
Can Ti-6Al-2Sn-4Zr-2Mo-0.1Si be welded?
GTAW, plasma, electron-beam and laser welding are practical with full inert-gas or vacuum shielding and clean surfaces; hydrogen/oxygen pickup must be avoided and a 540–650 °C post-weld stress relief is normal.
Can Ti-6Al-2Sn-4Zr-2Mo-0.1Si be formed, bent or molded?
Cold formability is poor; hot form or hot size at 700–870 °C (forge below the ~995–1010 °C beta transus for alpha/beta structure), then chemically mill or grind off alpha case.
Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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 |
| Sicreep-strengthening addition that distinguishes the 'S' variant | 0.06 – 0.1 | 0.08 |
| Fe | ≤ 0.25 | |
| Omax; often 0.10–0.12 for creep grades | ≤ 0.15 | 0.11 |
| C | ≤ 0.05 | |
| N | ≤ 0.05 | |
| Hmax (bar/forging) | ≤ 0.01 | |
| Ymax, aerospace melt cleanliness | ≤ 0.01 | |
| other, eachresiduals total 0.40 max | ≤ 0.1 | |
| Ti | balance |
What surface finishes work on Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Grit-blast/pickle to remove alpha case, then conversion anodise (AMS 2488) or shot-peen for fatigue; thermal-spray, nitride or DLC coatings are used for wear and galling since titanium galls against itself.
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).
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium Ti-6Al-2Sn-4Zr-2Mo-0.1Si in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Ti-6242S
How much does Ti-6Al-2Sn-4Zr-2Mo-0.1Si cost?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is a high-cost titanium ($$$$), pricier than about 78% 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-6Al-2Sn-4Zr-2Mo-0.1Si — frequently asked
What is Ti-6Al-2Sn-4Zr-2Mo-0.1Si used for?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is typically used for turbine engine compressor discs, compressor blades and blisks, engine casings and spacer rings, forged rings and shafts for engines, high-temperature airframe structure and sheet-metal exhaust and nozzle structures. In short: creep resistant to 510 °C; silicon-modified Ti-6242; hot-section engine alloy.
What is the yield strength of Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 86% of titanium grades. Strength varies by condition: see the 7 listed tempers.
Is Ti-6Al-2Sn-4Zr-2Mo-0.1Si easy to machine?
Not especially — machinability is rated poor (18/100, worse than 83% of titanium grades). Machine like a tough near-alpha Ti: rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (~20–40 m/min), heavy positive feed, flood high-pressure coolant, never dwell — work-hardened smearing and chip fires are the main risks.
Can Ti-6Al-2Sn-4Zr-2Mo-0.1Si be welded?
Yes — weldability is rated good (65/100). GTAW, plasma, electron-beam and laser welding are practical with full inert-gas or vacuum shielding and clean surfaces; hydrogen/oxygen pickup must be avoided and a 540–650 °C post-weld stress relief is normal.
What surface finishes work on Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Grit-blast/pickle to remove alpha case, then conversion anodise (AMS 2488) or shot-peen for fatigue; thermal-spray, nitride or DLC coatings are used for wear and galling since titanium galls against itself.
Can Ti-6Al-2Sn-4Zr-2Mo-0.1Si be formed, bent or molded?
Cold formability is poor; hot form or hot size at 700–870 °C (forge below the ~995–1010 °C beta transus for alpha/beta structure), then chemically mill or grind off alpha case.
What is the maximum service temperature of Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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-6Al-2Sn-4Zr-2Mo-0.1Si Duplex Annealed and Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA?
Duplex Annealed is the default condition — standard stocked condition for bar, billet, forgings and sheet: balanced strength, ductility and creep life. STA: choose when peak room- and mid-temperature strength is needed in thinner sections, accepting lower toughness. Yield strength is 930 MPa in Duplex Annealed versus 1,000 MPa in STA.
How much does Ti-6Al-2Sn-4Zr-2Mo-0.1Si cost?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si is a high-cost titanium ($$$$), pricier than about 78% 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.
Sources
- AMS 4975 — Ti-6Al-2Sn-4Zr-2Mo bar, forgings and rings — SAE International (2021)
- AMS 4919 — Ti-6Al-2Sn-4Zr-2Mo sheet, strip and plate, duplex annealed — SAE International (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- MMPDS — Metallic Materials Properties Development and Standardization — Battelle/FAA (2019)
- 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.