Ti-6Al-4V Titanium Piping And Tubing

Corrosion resistance for Titanium 6-4 ELI is generally excellent. Sometimes the alloy is susceptible to hot salt stress corrosion cracking. This risk can be minimized, however, with proper processing.

Ti-6Al-4V ELI displays limited section size hardenability, thus heat treatment is most commonly used in the annealed condition (various treatments below). Greater tensile properties, however, can be obtained by solution heat treatment followed by aging. While strength is gained from this, it is, however, at the expense of fracture toughness.

Ti-6Al-4V Titanium Piping and Tubing

When annealing 6-4 Titanium ELI, Mill anneal (MA) is the general purpose anneal used. This is common for all mill products. One should be aware that it may not be a full anneal, however, and there may be traces of hot, cold or warm working in heavily worked products such as sheet. Duplex anneal and triplex anneal can also be used on for improved creep resistance and recrystallization anneal (RA) and beta anneal (BA) are used to improve fracture toughness. Lastly, Beta annealing should be done above the beta transus temperature.

When performing precipitation hardening, solution treatment and aging (STA) can result in a wide range of strength levels and ductility, depending on the STA cycle and the section size. Additionally, solution treatment and overaging (STOA) can result in some increase in strength, with satisfactory toughness and dimensional stability.

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