And what, specifically, is the advantage of grade 2?
As I see it, this application doesn't take advantage of the properties available over other Ti materials. Most of the whiz bang material science stuff (tensile strength, extreme temperatures, corrosion resistance and so on) are not useful here, and in fact seeing as how the important points are probably workability of the wire (ability to cold form without stresses) and weldability I think, other grades might actually be better? Or at least not worse. In general you pick a material to match a mission not just because it's the 'in vogue' one?
So, why grade 2? TIA
OF
Because grade 2 is the best one for this use. It is commercially pure and capable of handling the stress if heating and cooling like a titanium nail. All worthwhile titanium nails use grade 2 because of the purity.
Take a loom at grade 2 Ti
Component Wt. %
C. Max 0.1
Fe. Max 0.3
H. Max 0.015
N. Max 0.03
O. Max 0.25
Ti. 99.2
Now looking at grade 5.
Component Wt. %
Al. 6
Fe. Max 0.25
O. Max 0.2
Ti. 90
V. 4
The two main differences is the aluminum and vanadium in grade 5.
We are trying to push the envelope and go forward while you might be ok with aluminum in your body or having vanadium I'm not and would rather use Ti Grades 1-4.
Now if you have a link to these so called Ti's I'm happy to have it sample tested.