I'd think the first analysis would be closer to the actual composition- the second sounds like AH Fox Chromox , developed after the Krauts cut off the flow of Krupp Stahl following the Lusitania business- go figure. Nicht Fur Kugel-- Not for use with slugs- wonder why so--

The House of Krupp is indeed a great read- they had developed nickel based ordnance steels, but even during the Boer War- the Junker High Command would only approve Brass alloys for their mortar and field cannons- Mauser and the Big Bertha of WW1 changed their minds, and Krupp, like Siemens and I.G. Farben and bayer, became Kraut wartime dynasties, both the 1914-1918 version and the sequel 1939-1945- Jawohl!!

"The field is the touchstone of the man"..