Titanium 6-2-4-2

Titanium 6Al-2Sn-4Zr-2Mo, also known as 6-2-4-2, is an alpha-beta Titanium. Primarily used for its combination of tensile strength, creep strength, and toughness, Ti 6-2-4-2 has good creep resistance up to 550°C and up to 0.1% Silicon is frequently added to further improve the creep resistance of the alloy. Ti 6-2-4-2 alloy is produced by primary melting under vacuum (VAR), electron beam (EB) melting or plasma arc cold hearth melting (PAM). Primary melting is followed by single or double vacuum arc re-melting (VAR).

The forging and machining characteristics of Ti 6-2-4-2 are similar to those of Ti 6Al-4V and weldability of Ti 6-2-4-2 is fair, using AMS 4952 weld wire. Several different treatments are also available. Ti 6-2-4-2 is capable of being heat-treated to higher strengths in greater section sizes than 6Al-4V. Widely used in forged components, 6-2-4-2 beta forged material has enhanced strength, ductility and a combination of good low-cycle fatigue and fatigue crack growth resistance. This alloy is used in the intermediate compressor stages of turbine engines for disks and blades, seals, and for airframe parts.