Differentiating Grade 23 (6-4 ELI) from Grade 5 (6-4) Titanium alloy

[prdave00]

I have a part that is made out of a titanium alloy per an ISO standard. The issue is the ISO standard covers both the Grade 23 and Grade 5 alloy in terms of chemistry and mechanical properties. Unfortunately the supplier of this part is either not being forthcoming or doesn't actually know what grade it is. I'll keep hammering at the supplier, but are there any quantitative analytical techniques to determine which alloy it is? Would the fact that the part is anodized introduce any artifacts?

On a separate note, what's the best (and/or quickest) way to tell the condition of a titanium alloy? Grain structure, tensile test, hardness, etc.?

 

[EdStainless]

Begin cutting it up.
You will need very good micros and careful testing.
The ELI material has lower content of residual elements and a cleaner microstructure.
You will need a lab that does a lot of aerospace Ti work to help with this.

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Plymouth Tube

 

[metengr]

Agreed. Sorting of these materials must be done by a reputable metallurgical lab.