Fox Collectors

The A.H. Fox Gun Co. used Krupp steel on the graded guns from its beginning in 1906, with “Sterlingworth Fluid Compressed Steel” for the lower priced Sterlingworth in 1910.
“Chromox High Pressure Fluid Steel” was introduced in 1912, presumed to be chrome, nickel and vanadium
https://books.google.com/books?id=eGvdC ... =PA137&lpg

May 25, 1912 Sporting Life
https://digital.la84.org/digital/collec ... 24/rec/138

I've tested a single segment of a c. 1929 “Sterlingworth Fluid Compressed Steel” and it was AISI 1045 with a measured Tensile Strength of 103,000 psi.

If someone would like to cut a chunk of pre-WWI Sterlingworth or Chromox barrel, I'd be happy to composition and tensile test it

Only a handful of the earliest Ansley H. Fox smallbores that I have recorded have the CHROMOX marked barrels. In the 16-gauges the six I've recorded from 300004 to 300061 have CHROMOX marked barrels while the 24 I've recorded from 300069 to 300890 all have KRUPP barrels. In the 20-gauges I have a mix of KRUPP and CHROMOX in the first 108, and all KRUPP for the thirty-one I've recorded from 200121 to 200721. Just as with STERLINGWORTH barrels we see CHROMOX barrels with the tube supplier's marks SB&Co., LLH and the D with the three-lobed crown over it. I've also seen a couple of 1920 vintage guns marked CHROMOX with vestiges of the --FLUID--STEEL--KRUPP--ESSEN-- markings on the bottom of the tubes.