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» Ti3Al2.5V Grade 9

This alloy is sometimes referred to as "half 6-4". It offers 20 to 50 per cent higher strength than C.P. grades, but is more formable and weldable than Ti6Al4V. It is principally used as tubing in aircraft and engine hydraulic systems, for high strength corrosion resisting applications such as pipes and vessels and as foil for honey-comb applications. It is also used in a variety of recreational applications such as golf club shafts, tennis racquets, bicycle frames, etc.

» Ti3Al2.5V 0.05Pd (Grade 18)

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

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

Composition Physical Data Mechanical Data Fabrication Information

» Composition

C < 0.05 %
Fe < 0.3 %
N2 < 0.02 %
O2 < 0.12%
Al 2.5 - 3.5 %
V 2.0 - 3.0 %
H2 (sheet) < 0.015 %
H2 (bar) < 0.0125 %
Ti = Rem

» Physical Data

  Minimum Typical
Density g/cm3 (lb/cu.in)   4.48 (0.161)
Melting Range °C+/-15°C (°F)   1704 (3099)
Volume Electrical Resistivity µohm.cm (µohm.in)   124 (49)
Thermal Conductivity W/mK(Btu/ft h°F)   7.6 (53)
*Mean Thermal Exp. Coeff. 0-300°C/°C 7.9 x 10 -6 9.2 x 10 -6
Beta Transus °C+/-15°C(°F)   935 (1715)

» Mechanical Data

  Minimum Typical
Tensile Strength MPa(ksi) 621 (90) 740 (107)
0.2% Proof Stress MPa(ksi) 483 (70) 607 (88)
Elongation over 2 Inches % 15 17
Elastic Modulus GPa(Msi) 91 (13)  
Hardness Rockwell C   15
Specified Bend Radius <0.070" x Thickness   2.5
Charpy, V-Notch Impact (L direction-pipe) J(ft Ibf)   48(35)
Charpy, V-Notch Impact J(ft Ibf)   48 (35)
Short Term Creep, 1.0% Strain (1000h @ 250°C) MPa (ksi)   400 (58)
Stress Rupture (1000h @ 250°C) MPa   421

» Fabrication Information

Weldability Good
Forging Rough 871-899°C(1600-1650°F), finish 843-871°C (1550-1600°F)
Annealing 593-760°C(1100-1400°F), 1-3 hr, AC
Solution Treating 871-927°C (1600-1700°F) 15-20 min, WQ
Ageing 482-510°C (900-950°F) 2-8 hr, AC
Stress Relief Annealing 316-649°C (600-1200°F), <<-3hr, AC