I have multiple old circular saw blades, pretty big stuff. I cannot cut them, I am too lazy to anneal them(plus I am out of charcoal. being a teenage blacksmith can suck).
It is around 1/8th in thick, very, very hard. it will wreck a hacksaw blade if you try to cut it.
I can send you half a blade or a whole blade. Whole is hardened alloy steel, the half is carbon-nickel-something steel, it seems harder.
I cut one blade in half with a Dremel, using 8 cutting disks. I was planning on making a hunting knife and some throwing knives.
-Squirrel