TA19 (Ti-6242 / Ti-6Al-2Sn-4Zr-2Mo) Near-Alpha Titanium Alloy

TA19 is a Chinese near-α high-temperature titanium alloy of nominal composition Ti-6.5Al-2Sn-4Zr-2Mo, corresponding directly to the international Ti-6242 / UNS R54620 family. It offers high elevated-temperature strength and stability, good weldability and good corrosion resistance, and is used in aero-engine compressor components and airframe structures operating up to about 550 °C.

Overview

• Material: TA19 — Ti-6.5Al-2Sn-4Zr-2Mo near-α titanium alloy
• International equivalent: Ti-6242 / Ti-6Al-2Sn-4Zr-2Mo / UNS R54620
• Available forms: Bar, plate, sheet, forgings and castings

Chemical Composition (wt%)

Physical Properties

Mechanical Properties

Key Features

• High elevated-temperature strength and stability at 500–550 °C;
• Good thermal stability after 1000 h exposure at 540 °C;
• Good weldability;
• Good corrosion resistance;
• Good all-round mechanical properties.

Fabrication & Heat Treatment

• Melting & casting: bar ingots by three vacuum arc remelts (VAR); castings are gravity- or centrifugal-poured in a VAR skull furnace from investment, rammed-graphite or machined-graphite moulds.
• Hot working: 850–1050 °C with controlled heating rate and hold time.
• Cold working: cold rolled and cold drawn with intermediate annealing.
• Welding: TIG and electron-beam welding with thorough surface preparation and suitable shielding.
• Double annealing (bar / forgings): 970 °C / 1 h, air cool, then 595 °C / 8 h, air cool.
• Double annealing (sheet): 900 °C / 10–30 min, air cool, then 790 °C / 15 min, air cool.
• Triple annealing (sheet): double annealing above plus 595 °C / 2 h, air cool.
• Stress-relief annealing: 480–650 °C for 1–4 h, air or furnace cool.
• Castings: anneal 700–800 °C for 1–2 h; HIP at 900 ±10 °C, 100–110 MPa, 2 h, furnace cool below 250 °C; stress-relieve 580–620 °C for 1–2 h.

Typical Applications

• Aerospace: aero-engine compressor casings, blades and discs; wing spars, fuselage frames and wing panels;
• Energy: gas-turbine and nuclear-reactor components.

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