Titanium
Titanium is an element (Atomic No 22)
• Commercially pure
o Grade 2, grade 3
• Commonly alloyed with:
o Aluminium (Al) 5%
o Vanadium (V) 4%
o Grade 5 for high strength
• Cast grades
• ASTM B367
o C2,C3 equivalent to UNS R50400,R50550 & R52550
o C5 equivalent to UNS R56400, R56401
Typical Properties
C2 C3 C5
Tensile 275 450 895 min N/mm2
Yield 345 380 825 min N/mm2
Elongation 15% 12% 6%
Hardness 230 320HB typ
Density 4.4 g/cm3
P/T: C2 SPT02 14.2 bar class 150
P/T: C3/C5 SPT04 18.4 bar class 150
Corrosion Properties
• Excellent in nearly all cases
• Poor fouling performance but immune to Microbiological Corrosion
Additional Uses & Comments
• High strength, low density
• Has been used where a 50 year life was required (Shell Troll- ballast system)
• Casting is a specialist process
• Very good for Acids (Nitric, Hydrochloric) and wet Chlorine too
• Can be cost effective, particularly if designed to take account of high strength
Cautions
• Welding- air must be excluded, otherwise hardening occurs.
• Not resistant to Hydrofluoric Acid
• Don’t use Methanol to clean- causes cracking
• Designs must take account of low modulus of elasticity (100 – 110 N/mm2)
• Galling and wear properties not good
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