Which Ti grade is most compatible to water saturated with chlorine and salt traces
Which Ti grade is most compatible to water saturated with chlorine and salt traces
(OP)
Hi glad to be member of this Forum.
Ti Gr12 has been used to construct pressure vessel to contain water contaminated with chlorine and some salt traces. Ti Gr 12 is potential of having crevice and pitting corrosion after 70 Deg. C. any suggestion of alternative or special care?
thanks
Ti Gr12 has been used to construct pressure vessel to contain water contaminated with chlorine and some salt traces. Ti Gr 12 is potential of having crevice and pitting corrosion after 70 Deg. C. any suggestion of alternative or special care?
thanks





RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
Who told you that Gr12 might pit in saturated NaCl at 70C? The tables that I look at warn that at pH<3 and temp >100C Gr12 would corrode in saturated NaCl with free Cl. How much Cl do you have?
The next step up in corrosion resistance is Gr16.
The other option is to stay with Gr12 and keep the pH up a little bit, anything over 4 should be plenty safe.
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P.E. Metallurgy, Plymouth Tube
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
thanks
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
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P.E. Metallurgy, Plymouth Tube
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
Generally, Gr.1, Gr.2, Gr.3, Gr.7, Gr.9, Gr.12 are commercially available due to the comparatively low cost.
www.metalspiping.com
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
With Gr7 the 0.5% Pd costs more than 5x as much as the 99.5% Ti does.
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P.E. Metallurgy, Plymouth Tube
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
www.metalspiping.com
RE: Which Ti grade is most compatible to water saturated with chlorine and salt traces
The lab test data is nearly identical and the price difference is significant (Gr 7 is more than 2x the price of Gr16).
If people want to stay with old alloys simply out of tradition then let them pay, but the data says otherwise. That is why Gr 16 was invented.
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P.E. Metallurgy, Plymouth Tube