My favorite hardy hot cutter has an included angle of about 40 degrees.
I have some slitting chisels that have an included angle of about 25
degrees and are about 1/4" thick at about 3/8" back from the cutting
edge. These tools are generally made from Atlantic 33 or S1.
I suppose 5160 would work about as well, but it will loose any
hardness once you get it hot enough to glow.
I even have one slitting chisel that used to be my sole slitter for
hammer heads that was made from OCS (old Car Spring), maybe something
like 1095. That's the kind of material that you stike 3 times and then
quench. They still soften up.
You can make the angles more blunt than the above if you don't care
about the edge you produce. My favorite cold cut hardy tool has an edge
with an included angle of about 60 or 70 degrees. I use it to cut hot
metal from time to time.
Sparks Alot wrote: