I'm wondering if heat treating can do much to improve a high carbon steel head. But then again, trade points are new to me. Why would you want to heat treat trade points. How thin are they? Curious...
What set me down this path was reading Dr. Ed Ashby's research on broadheads and penetration. One of his guidelines is that a broadhead should neither bend or break when it hits bone. Essentially a spring temper.
The 15N20 steel I'm using is aprox .07 thick and fully annealed, so it will definately bend if it hits something solid. It also won't take or hold much of an edge in this state, and the edge will roll easily.
I'd have to look it up but I think Ashby recommends a hardness in the low 50's.
The saw blade points (from old saw blades mentioned above) are probably already at the perfect hardness. If they were much harder it would be almost impossible to cut by hand with a hacksaw, and based on his difficulty of finding rhe perfect hacksaw blade for the job they are definitely at a good tough spring tempering
Many modern files, saw blades, and tools made in China are done from low quality metal and case hardened. Probably won't take a heat treating at all.
I'm able to take the warp out of some of the points by clamping them to steel in a reverse position in the tempering oven, but it's tedious and time consuming.