Stress relief on U-bend tubes of Ti Gr 2
Stress relief on U-bend tubes of Ti Gr 2
(OP)
Hi all,
I am looking for information about U-bend stress relief in seamless tubes of Ti Gr 2 for heat exchangers. Up to now I did not find any standard or code with information as time, temperature, etc for this heat treatment on Ti alloys. Our client request that the treatment is performed with electric resistance equipment.
Thanks in advance
Diego





RE: Stress relief on U-bend tubes of Ti Gr 2
http://cartech.ides.com/datasheet.aspx?i=101&E...
RE: Stress relief on U-bend tubes of Ti Gr 2
There is no reason to stress relieve the bends in Ti tubes.
They are not susceptible to stress cracking in any common environments.
There is a real chance that if you did this you could end up with u-bends that are much softer than the tubes.
Ti Gr2 is only stress relieved in production (it isn't annealed). The temperatures are usually in the 1000-1200F range.
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P.E. Metallurgy, Plymouth Tube
RE: Stress relief on U-bend tubes of Ti Gr 2
RE: Stress relief on U-bend tubes of Ti Gr 2
My main question are related to heat treatment time. Stress relief on titanium alloy, according bibliography and my own experience, takes about 1,5 to 2 hours as minimum.
In this case, where the tube are treated one by one, it is impossible to think in these times.
Because of that I am looking for some standards who certify that my process is acceptable.
Thanks