I was given almost 100 feet of Bandsaw blade a guy here on s.e.m. tested it for me and it turns out to be a Boron steel...0.07%C 0.68%Mn 0.002%B! 0.27%Si 1.15%Cr 1.05%Mo 0.67%Ni 0.17%V 0.04%W (it was low on P, S, Ti, Al and Cu)
Read that 0.002%B is high enough to make it harden with Boron.
I go by what I call the "arrest point method" (eyeball) to heat treat carbon steel and hadn't had any luck changing this bandsaw blade's hardness. Got any advice? :)
Alvin in AZ