Want to get my hands on some!
Careful what you ask for. You might get it.
I put a bar on the bandsaw with a new M42 bimetal blade and watched it just turn and skate. After 2 minutes, it was less than 1/16" in. On the big saw, the carbide grit blade complained but did get through. I took the small piece and ground off enough mill scale to rockwell test it. I figured it must not be annealed. About RHC 43. Looked at the spec sheet - it anneals to Brinnell 400 - about RHC 43 give or take a bit. (154CM is only brinnell 235.) This
is annealed. I took the rest of the bar down to the grinder to take off the mill scale. After about 10 passes each side,the 60g Norton hogger was giving me some shiny high spots but really getting nowhere. A fresh 36g hogger, not much more. After 20 slow passes at full speed (with some pressure from the push stick), I'm still not nearly there yet. 40 passes per side and switched to 24g Zirconia I'm getting somewhere, but after a dozen passes per side, I still have a long ways to go.
Obviously, this is about more than the hardness. I have ground prehardened (RHC60) blanks of 154CM, and this is just an order of magnitude harder. There are some serious carbides happening here and I suspect the Niobium plays a key role.
This steel is VERY difficult to work, but anything this tenacious has to be worth the effort.
I already know it is hell on bandsaw blades - and that it Eats Belts for Breakfast - and that the mill scale finish is very rough and uneven requiring lots of grinding.
I suspect drill bits are not going to like it, and 'Oh boy" am I ever looking forward to hand polishing it.
I really want to talk to someone else who has worked it.
This stuff is going to change my whole idea of machineability. Any one else manage to get a bit?
Rob!