Seems Witten Excelsior was a tad bit softer, with the addition of Phosphorus; hence the use for Scattergun Tubes.

>>Seems the Tiegelstahl - Qualitätsmarke Excelsior(Wittener Exzelsiorstahl) or crucible steel gained new ground by the turn of the 20th Century(mid to late 1890s?). It was akin to Wootz and may have met its match w/ the advent of the electric furnaces by WWI.<<

https://de.wikipedia.org/wiki/Stahlerzeugung#Historische_Verfahren

Hochachtungsvoll,

Raimey
rse