TB2 Metastable Beta Titanium Alloy

TB2 is a Chinese metastable β-type titanium alloy of nominal composition Ti-3Al-5Mo-5V-8Cr. In the solution-treated condition it is soft, ductile and readily cold-formable, and after ageing it reaches very high strength (≥ 1300 MPa) with good toughness, fatigue strength and corrosion resistance — a typical high-strength fastener and aerospace spring / housing material.

Overview

• Material: TB2 — metastable β titanium alloy
• Nominal composition: Ti-3Al-5Mo-5V-8Cr (near the Beta-C family in behaviour; verify against mill spec)
• Available forms: Bar, wire, plate, strip and forgings

Chemical Composition (wt%)

Physical Properties

Mechanical Properties

Key Features

• Excellent cold-formability and good weldability in the solution-treated state;
• High strength with good ductility after ageing;
• Good corrosion resistance, heat resistance and fatigue performance;
• Good biocompatibility.

Fabrication & Heat Treatment

• Melting: at least two vacuum arc remelts (VAR).
• Hot working: forged, hot-rolled or hot-extruded at 850–1000 °C with controlled heating.
• Cold working: room-temperature ductility is limited; cold drawn, rolled or headed with carefully controlled parameters.
• Welding: good weldability, but under strictly controlled conditions to avoid contamination and hot cracking.
• Solution treatment: 750–800 °C (typically 800 ±10 °C) for 3–30 min, air cool or faster.
• Ageing: 450–550 °C (typically 500 ±10 °C) for 8–24 h, air or furnace cool.
• Stress-relief annealing: 650–700 °C for 30–60 min, air or furnace cool.

Typical Applications

• Aerospace fasteners: bolts and rivets for service below 300 °C;
• Space (short-time high-temperature): solid-rocket motor cases and vehicle-launch-clamp bands for short-term service below 500 °C;
• Medical: implant components requiring high strength and biocompatibility.

Limitations

• Relatively high density;
• Lower modulus and limited elevated-temperature creep resistance;
• Higher production cost and difficult machining; low thermal conductivity makes heat dissipation during hot working difficult.

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