TC6 (Ti-6Al-2.5Mo-2Cr) Alpha-Beta Titanium Alloy

TC6 is a Chinese α+β two-phase titanium alloy of nominal composition Ti-6Al-2.5Mo-2Cr (with Si), broadly comparable to the Russian BT3-1 family. It offers high strength, good hot strength for long-term service at 400–450 °C and good oxidation resistance, and is used mainly for aero-engine discs / blades and highly stressed aircraft structures.

Overview

• Material: TC6 — Ti-6Al-2.5Mo-2Cr-Si α+β titanium alloy
• Nominal composition: Ti-6Al-2.5Mo-2Cr-Si (approx. BT3-1-type)
• Available forms: Bar, plate, forgings and custom profiles

Chemical Composition (wt%)

Physical Properties

Mechanical Properties

Key Features

• Good all-round mechanical properties: high strength and reasonable ductility;
• Good hot strength for long-term service at 400–450 °C;
• Corrosion resistance better than stainless steel in most environments;
• Reasonable oxidation resistance within its service range.

Fabrication & Heat Treatment

• Melting: vacuum arc remelting (VAR) for uniform composition and quality.
• Hot working: forged, rolled or extruded at 850–1050 °C with controlled heating.
• Cold working: moderate cold ductility; cold rolled and cold drawn with intermediate annealing at approx. 650–750 °C.
• Welding: TIG and electron-beam welding are possible, but as a highly alloyed α+β alloy it is sensitive to the weld thermal cycle; post-weld heat treatment is required to restore the weld and HAZ properties.
• 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, for best balance.
• 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, compressor discs and blades; airframe bulkheads, joints, load-bearing clamps, actuator cylinders and tail rods;
• Chemical: reactors, piping and columns for high-temperature, high-pressure, highly corrosive service.

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