Thank you Raimey. We've got some published Krupp composition studies (a couple of which you likely found) here about 4/5 way down https://docs.google.com/document/d/1dnRLZgcuHfx7uFOHvHCUGnGFiLiset-DTTEK8OtPYVA/edit

Dennis Potter gave me a Krupp segment for the tensile testing, but he did not know the origin or DOM thereof - 113,000 psi!
I didn't have it composition tested however.

I'll decline to test non-U.S. Krupp tubes, but would certainly like to test a Krupp tube from a U.S. maker's gun.

And while we're on the topic, I've got a segment of Fox “Sterlingworth Fluid Compressed Steel” on the way.
A Sterlingworth brochure in 1911 mentioned “chrome-nickel and vanadium steel” barrels and “Chromox High Pressure Fluid Steel” was introduced in 1912
https://books.google.com/books?id=eGvdCgAAQBAJ&pg=PA137&lpg

I'll do both composition and tensile testing, which should be of interest to the Fox fellas.

https://sites.google.com/a/damascusknowledge.com/www/home