Don Foreman wrote...
18 TPI blade ... running at wood speed (3000 SFPM) cut that .020
steel cleanly as fast as he could push it thru the saw. No heat
problems, no broken teeth, smooth cuts. Ear protection
strongly recommended!

Zero TPI works for this, too, BTW, with blade speeds ranging from 3000 to
at least as high as 15,000 SFM. Starting with a fine-toothed carbon steel
blade, it will be effectively zero TPI after a couple uses, anyway. In
this case the cut is achieved by friction, though, so your remark about
no heat problems might not apply. I seem to recall hearing (no personal
experience) that up to 1/4" thick steel can be cut by this method on a
woodworking bandsaw. Of course, the blade is destroyed for other
purposes.

Jim