This alloy is sometimes referred to as ‘half 6-4’. It offers 20 to 50% higher strength than commercially pure grades, but is more formable and weldable than Ti6Al4V. It is principally used as tubing in aircraft engine hydraulic systems, for high strength corrosion resisting applications such as golf club shafts, tennis rackets, bicycle frames etc.
Ti3Al2.5V0.05Pd (Grade 18)

Grade 18 is identical to Grade 9 with the exception of the addition of palladium to increase the corrosion resistance. Mechanical and physical properties, specifications and forms are all identical to those of Grade 9.

The alloys composition differs by the addition of 0.04-0.08% Pd.
Composition

Table 1. The composition of Ti3Al2.5.




Content

C


<0.08%

N2


<0.03%

O2


<0.15%

V


2.0-3.0%

Al


2.5-3.5%

Fe


<0.25%

H2


<0.015%

Ti


Balance
Designations

Other designations for Ti3Al2.5 include:

· AMS 4943

· AMS 4944

· AMS 4945

· ASTM B265 Gr9 and Gr18

· ASTM B337 Gr9

· ASTM B338 Gr9 and Gr18

· ASTM B348 Gr9 and Gr18

· ASTM B381 Gr9

· MIL –T –9047

· MIL –T –9046 AB5

· ASTM B264 Gr9

· ASTM B348 Gr9

· UNS R56320 Grade 9

· UNS 56322 Grade 18