Personally, I use silicon carbide "green" wheels for everything. They're designed for grinding carbide and are not recommended for steel, but I like the way they perform. They do wear pretty quickly, but for the amount I use them it's not a problem. I find they don't glaze, at all, and tend to run cooler than other wheels I've tried.
Incidentally, while they can grind carbide, for a REALLY good edge on carbide you need a diamond wheel.
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