Ti-5Al-2.5Sn is an alpha titanium alloy stabilized by aluminum and tin, specifically formulated for applications requiring high-temperature performance up to 480°C (896°F). While offering medium strength compared to alpha-beta alloys, it provides exceptional structural stability, excellent weldability, and good oxidation resistance at elevated temperatures. This alloy is extensively specified for gas turbine engine casings, airframe components, and chemical processing equipment where fabricability and high-temperature performance are essential .
1. Product Specifications & Physical DataZYTC Alloy supplies UNS R54520 in comprehensive mill forms for aerospace, industrial, and chemical processing applications requiring verified elevated-temperature properties and complete material traceability. Available Forms: Bar, billet, plate, sheet, wire, extrusion, and castings . Specifications: AMS 4926, AMS 4966, ASTM B265 (sheet/plate), B348 (bar/billet), B381 (forgings), MIL-T-9046, UNS R54520 .
| Chemical Composition (Weight %) | Ti-5Al-2.5Sn Specification |
|---|
| Titanium (Ti) | Balance | | Aluminum (Al) | 4.0 - 6.0 | | Tin (Sn) | 2.0 - 3.0 | | Iron (Fe) | 0.50 max. | | Oxygen (O) | 0.20 max. | | Carbon (C) | 0.10 max. | | Nitrogen (N) | 0.030 max. | | Hydrogen (H) | 0.015 max. | | Other, each | 0.05 max. | | Other, total | 0.30 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 4.45 - 4.48 g/cm³ | 0.161 - 0.162 lb/in³ | | Melting Point | 1540 - 1590°C | 2800 - 2894°F | | Beta Transus | 1040°C ± 15°C | 1904°F ± 25°F | | Modulus of Elasticity | 110 - 125 GPa | 16.0 - 18.1 × 10⁶ psi | | Shear Modulus | 48 GPa | 6,960 ksi | | Poisson's Ratio | 0.31 | 0.31 | | Thermal Conductivity (RT) | 7.9 W/m·K | 55 BTU·in/hr·ft²·°F |
| Mechanical Properties (Annealed) | Metric | Imperial |
|---|
| Tensile Strength (min.) | 750 - 827 MPa | 109 - 120 ksi | | Yield Strength (0.2% offset, min.) | 690 - 750 MPa | 100 - 109 ksi | | Elongation (min.) | 10 - 15% | 10 - 15% | | Reduction of Area (min.) | 25% | 25% | | Hardness, Brinell | 320 | 320 | | Hardness, Rockwell C | 36 | 36 |
Note: The mechanical properties in the original query (827 MPa yield, 517 MPa tensile) contain an inconsistency. Corrected values per AMS 4926 are provided above.
2. Fabrication & Material ComparisonTi-5Al-2.5Sn offers excellent fabricability, particularly for welded structures, making it ideal for complex aerospace fabrications. Annealing: 718-843°C (1325-1550°F) × 4 hours, air cool; full softening after cold work . Stress Relieving: 538-650°C (1000-1200°F) × 1 hour, air cool; intermediate treatment . Hot Working/Forging: 1010-1038°C (1850-1900°F), finish at 954-1010°C (1750-1850°F); maintain temperature below beta transus (1040°C) . Cold Working: Similar to moderately tempered austenitic stainless steel; can be formed using power brakes and hydropresses. Post-work annealing recommended to restore properties . Machining: Lower cutting forces than Ti-6Al-4V; requires sharp tools, positive rake angles, and adequate coolant to prevent work hardening . Welding: Excellent weldability using GTAW, GMAW, plasma arc, and electron beam; minimal loss of ductility in weld zone; shielding with inert gas essential to prevent contamination . Material Comparison: vs. Ti-6Al-4V: Lower room-temperature strength but superior weldability and elevated-temperature stability; selected for welded fabrications . vs. Ti-5Al-2.5Sn ELI: Lower interstitial version for enhanced fracture toughness; specified for cryogenic applications . vs. Ti-8Al-1Mo-1V: Lower strength but better weldability; alternative for specific engine applications . vs. 321 Stainless: Half the density, comparable elevated-temperature strength; superior corrosion resistance .
3. ApplicationsAerospace & Gas Turbines: Engine casings, rings, frames, compressor cases, ducting, shrouds Airframe Components: Structural parts, wing sections, fuselage components, firewalls Aircraft Engine: Compressor blades and vanes (selected applications), exit guide vanes Chemical Processing: Reactor vessels, heat exchangers, piping systems for elevated-temperature corrosive service Marine: High-temperature seawater components, heat exchangers Industrial: High-temperature processing equipment, furnace components
Contact ZYTC Alloy for certified Titanium Grade 6 materials with complete traceability, AMS/ASTM specifications, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
