TC9 (Ti-6.5Al-3.5Mo-2.5Sn) Heat-Resistant Titanium Alloy

TC9 is a Chinese α+β heat-resistant titanium alloy of nominal composition Ti-6.5Al-3.5Mo-2.5Sn-0.3Si. It offers high strength, excellent hot strength and creep / fatigue resistance for long-term service at about 500 °C, and is used mainly for aero-engine compressor and turbine hot-section components.

Overview

• Material: TC9 — Ti-6.5Al-3.5Mo-2.5Sn-0.3Si α+β heat-resistant titanium
• Available forms: Bar, plate, forgings and custom profiles

Chemical Composition (wt%)

Other elements: each ≤ 0.10 %, total ≤ 0.40 %.

Physical Properties

A thin protective oxide forms after long exposure at 400 °C; oxidation becomes severe above 550 °C.

Mechanical Properties

Key Features

• Good all-round mechanical properties: high strength and reasonable ductility;
• Excellent hot strength for long-term service at 500 °C;
• Good oxidation resistance within its service range;
• Good corrosion resistance in most environments;
• Outstanding elevated-temperature creep and fatigue resistance.

Fabrication & Heat Treatment

• Melting: vacuum arc remelting (VAR) for uniform composition and low impurities.
• Hot working: forged, rolled or extruded at 850–1050 °C with controlled heating.
• Cold working: moderate cold ductility; intermediate annealing at approx. 650–750 °C.
• Welding: TIG and electron-beam welding after thorough cleaning and with suitable shielding.
• Standard annealing: 800–850 °C for 1–2 h, air cool.
• Double annealing: 950–1000 °C for 1–2 h air cool, then 550–600 °C for 4–6 h air cool.
• Solution treatment & ageing: solution treat at 950–1000 °C then rapid cool; age at 500–550 °C to raise strength.

Typical Applications

• Aerospace: aero-engine blades, turbine discs and combustor hot-section parts; airframe structures and landing gear;
• Shipbuilding: marine gas-turbine blades and turbocharger blades;
• Petrochemical: high-temperature / high-pressure vessels, reactors and piping;
• Medical: artificial joints and dental implants.

For detailed datasheets, mill certificates (EN 10204 3.1) or inquiries on specific sizes and tolerances, please contact our sales & engineering team.