Interesting and relevant thread from 2009 with lots of contributions from Raimey
https://www.doublegunshop.com/forum...p;Board=1&main=13559&type=threadAs mentioned, Krupp marked tubes stamped “Acier Cockerill” or with the “LLH” of Laurent Lochet-Habran are commonly found on Belgian doubles.
And we know that the vast majority of "rough forged tubes" used by U.S. double gun makers were sourced in Belgian.
We also know Carnegie and Bethlehem Steel were licensed to manufacture Krupp steel plate in 1897;
New York Times Nov. 7th, 1897
http://query.nytimes.com/mem/archive-free/pdf?_r=1&res=9A00E5DA123CE433A25754C0A9679D94669ED7CF But I am not aware of evidence that either made Krupp licensed shotgun barrel steel.
Winchester, Remington and Stevens did use domestically produced barrel steel.
Send me a chunk of your Lefever Krupp barrel and I'll take it over to METL for composition analysis
Dennis Potter sent me a sample of Krupp for the tensile testing study but the source and age was unknown so I didn't think composition analysis would be meaningful. The tensile strength was 113,000 psi.
https://docs.google.com/document/d/1cvqRzkg0wEjhAAcFWr8gFi7aPFRsSIJ_hahfDxmrNAU/edit Scroll down almost to the bottom here and there is a little information about Krupp composition, mostly from the 2009 thread
https://docs.google.com/document/d/1dnRLZgcuHfx7uFOHvHCUGnGFiLiset-DTTEK8OtPYVA/edit
