Gee, I'll bet a 1953 edition is real useful for info on submicrograin carbides. <g>
The 26th Edition isn't a lot better. It just mentions them, and it sounds like15- or 20-year-old info. It says their first uses were in woodworking, and their metalcutting applications are for low speeds and high feedrates. Not any more, pard'.
Eh. I'm short on research time now but it's a worthwhile project. Remind me in a week and I'll dig out my old contacts to see what gives.
Oh, for anyone interested in grades of carbide for different applications: The old "cutter-class" designations, C2 - C9 or whatever, aren't even reported in the 26th Edition anymore. It was always an arbitrary scale that had nothing to do with the formulation of the carbide itself. It was based on applications (C9 for fine finishing, C2 is supposedly tough, etc.) and it was up to the manufacturer to rate them. So there is no consistency in the cutter-class scale.
Here's one more modern table, based on the ISO designations with some reference to cutter-class. It contains some info on micrograins:
I'll see if I can find something better next week.
-- Ed Huntress