Difference between Ti Gr 2 and Ti Gr 12 of Titanium
Difference between Ti Gr 2 and Ti Gr 12 of Titanium
(OP)
We have an exchanger in Nitric acid plant, the channel of this exvhanger is parially made in Ti Gr 2 while rest of it is made with Ti Gr 12. We have been experience corrosion in the HAZ of G 12 Titanium and would like to understand the difference between these grades in terms of corrosion resistance.





RE: Difference between Ti Gr 2 and Ti Gr 12 of Titanium
Here is a quick list
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The two grades have similar strength, but 12 has small Ni and Mo additions. This is to improve corrosion resistance (enhance repassivation kinetics) at lower cost than adding Pd or Ru.
My hunch is that the gr12 in in the hotter section or the more dilute section of the exchanger. It is probably failing because it is not good enough. You may need to build this exchanger with three different grades, 2, 12, and 16 in the harshest areas.
Get a professional failure analysis done. If you make any mistakes it will be very expensive.
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Plymouth Tube
RE: Difference between Ti Gr 2 and Ti Gr 12 of Titanium
I agree with Ed, get help from a metallurgical consultant who is experienced in corrosion and do a careful evaluation of your process stream.