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Unread 01/17/2020, 05:59 AM   #1
kirsto71
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Join Date: Jun 2006
Location: Mackay Queensland, Australia
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Titanium

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


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Unread 01/17/2020, 07:34 AM   #2
mcgyvr
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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.


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Unread 01/17/2020, 11:12 PM   #3
bertoni
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I agree that either alloy should be fine. The grade 2 might be a bit safer in theory, but either should be fine.


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Unread 01/18/2020, 12:25 AM   #4
kirsto71
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Location: Mackay Queensland, Australia
Posts: 195
Thanks for the feedback. I will try and get a Grade 2 bolt but know where to get a Grade 5.


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