TC2 (Ti-4Al-1.5Mn) Near-Alpha Titanium Alloy

TC2 is a Chinese near-α (Ti-Al-Mn) titanium alloy of nominal composition Ti-4Al-1.5Mn. It offers medium strength, good plasticity and excellent weldability, and can serve long-term at 350 °C (short-term up to about 750 °C), used mainly for pressed and welded sheet-metal aerospace parts and corrosion-resistant tubing.

Overview

• Material: TC2 — Ti-Al-Mn near-α titanium alloy
• Nominal composition: Ti-4Al-1.5Mn
• Available forms: Bar, plate, sheet, tube and forgings

Chemical Composition (wt%)

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

Physical Properties

Mechanical Properties (annealed)

Key Features

• Medium strength with good plasticity;
• Good process ductility and ease of forming;
• Excellent weldability (TIG, spot and seam welding);
• Good thermal stability — long-term service at 350 °C, short-term up to 750 °C;
• Moderate corrosion resistance.

Fabrication & Heat Treatment

• Melting: two vacuum arc remelts (VAR); Mn added as an Al-Mn master alloy; first melt under vacuum, second under argon.
• Hot working: forged, hot-rolled or hot-extruded at 850–950 °C with controlled heating.
• Cold working: cold rolled and cold drawn; intermediate annealing at 650–680 °C at high cold-reduction levels. For complex stampings, preheat the blank to 550–600 °C (resistance or torch heating) before forming.
• Welding: TIG, spot and seam welding; control workpiece and weld-zone temperature to avoid overheating or rapid cooling; stress-relieve after welding.
• Annealing: sheet / sheet parts 660–710 °C for 15–60 min, air cool or slower; bar / forgings / tube 740–790 °C for 1–2 h, air cool.
• Stress-relief annealing: 545–585 °C for 0.5–6 h, air or furnace cool.

Typical Applications

• Aerospace: pressed and welded sheet-metal parts such as the forward tail-cone skin and engine lower cowls;
• Chemical industry: piping and vessels operating at moderate temperature in corrosive service.

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