Great post, Del. One carbide former that is not present in O1 or L6 but is in steels like W2 and some 1084 blends like the stuff that Aldo Bruno sells is vanadium. From what i have read and heard, it is in the same class as tungsten as far as forming the hard little carbides that we knife guys love and it also retards grain growth so your steel doesn't stat looking like is is made from beach sand until it gets a couple of hundred degrees hotter than say plain carbon steel or something like 5160.. The put a LOT of vanadium in some of the CPM steels and that is what makes them so wear resistant and also so hard to sharpen. I think that Crucible mixed about 1% niobium in the new S35VN and reduced the vanadium content from 4 to 3%. Supposedly that cures some of the brittleness issues that folks experienced with S30V. Cry Forge V has the carbon content of W2 or O1, 3 times the vanadium of W2 and about the same chromium as 5160. I ncontext to what Del is talking about, the problem with Cru Forge is that there isn't a nickel bearing steel that matches up perfectly with it like O1 does with ral L6 or 10xx or W1, W2 does with 15N20, so not many people have tried to make damascus with it. Another reason may be that with .50 chromium, the steel would etch more gray than black.