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topic 17866

Hydrogen embrittlement?


I have been specifying Teflon coated hi tensile bolts for sub sea use for some time and now need an alternative. Will cad plated studs/bolts cause hydrogen embrittlement if used in a sub sea environment @ about 50 centigrade? Sac anode CP is applied.


Gary Evans
- Perth, Australia


It sounds like you need to perform some testing which simulates this environment. Typically, a notched tensile is prepared with the cad plate and are load tested. A certain percentage of the failure load( depending to what standard you are working to ) is applied (around 75% of the breaking load) statically to another notched tensile for a specified period i.e 8 days. If it breaks before the required duration then the conclusion is hydrogen embrittlement.

M Hogan
- Melbourne


Why do not use titanium alloy bolts?

Andrey Igolkin
- St.Petersburg, Russia

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