Schatt and Morgan File & Wire series 5 use ATS-34. Case sometimes uses different steels, their Slim Lock uses BG-42, but it isn't a traditional pattern per se.
Canal Street uses something they call Cr 14-4Mo, no idea what it's equivalent to but my Half Moon Trapper came with a popping sharp edge on it.
I'm looking forward to my GEC Bullnose in O1 tool steel. Other than D2 that some makers like Queen use, I believe you'll find the super steels mostly in customs.
I got on a bit of a steel kick with Spydercos, but I've been just as happy using my knives with plain old 420HC, Case's CV and 1095 carbon. They're a heck of a lot easier to sharpen too!