Titanium

[kirsto71]

I need to replace bolt in a pump. My question is is it safe to use Grade 5 Titanium instead of Grade 2.

The Grade 5 has:

4% vanadium
6% aluminium
90% titanium

The Grade 2 has:

99% titanium

I guess the question is will the small amount of aluminium in a 420 gallon FOWLR tank be a risk. As far as the vanadium I have never heard of any issues with that but worth asking.

Thanks
Marc

 

[mcgyvr]

It is safe to use that Titanium in seawater applications as the oxide layer will prevent most if not all corrosion/selective dealloying effects.

Any aluminum input in the tank would likely be more from the salt mix or foods than the small alloying amount.

 

[bertoni]

I agree that either alloy should be fine. The grade 2 might be a bit safer in theory, but either should be fine.

 

[kirsto71]

Thanks for the feedback. I will try and get a Grade 2 bolt but know where to get a Grade 5.