If you clean your steel and keep them flat almost any steel will forge weld in a canister or with a seem welded around the billet ( san mai )
I have used O1, 52100, OFS ( old file steel ) , O2, White paper and stainless 316, 304, Aebl, 420......
I heat the billet at forge welding temperature for 15 - 20 min before the first weld and also for at least 10 minutes when welded or between welds.
Steels have to be the right thickness in san mai .....if not the core will be either to thick or too thin or there will be way too much grinding on the outer layers. I still get this wrong although I try to keep a record of my works.
I have never used a tube - so looking forward to seeing the result