Back when I made regular knives out of them, I ground them cool and then tempered them as per L-6.
I recently made a couple of Ulu's out of a circular saw blade and didn't bother with a temper. They take a great, long lasting edge and there's been no chipping. When I think about it, it seems that saw blades have to be a lot more resilient than say files, which have to be very hard. so the Rc might be(appears to be) closer to a good knife blade. One thing I did find out recently. A friend gave me some carbide tipped 10" blades. I profiled a blade and then ground it. I was amazed how easy it was to grind; and to drill. The steel, if it was steel, obviously had a very low Rc and would need the whole Heat Treat/Temper thing done. Since I've no idea what the steel is on carbide saws, I didn't bother sending it to my Heat Treater.