This always gets me. Tudor went with a Grade 2 Ti, instead of the higher performance Grade 5 Ti. Why, no one knows.
Grade 2 Ti is more pure in the sense that it doesn't have aluminium and vanadium added to make Grade 5. But it is inferior to the Grade 5 as it doesn't comply to high stresses such as in aviation. As an example, Grade 5 is about three times stronger than Grade 2. Of course there are other properties where Ti has over stainless steel, especially weight where it is the preferred choice.
In that sense, Grade 2 is also softer, hence being less scratch resistance than Grade 5 and normal stainless steel.
Only downside of the Pelagos is the titanium easily get scratched
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