I tried doing a heat treat myself using a torch to get the steel glowing red hot then submerging it in used motor oil. I did this twice. I am not sure how well it worked or how hard it is. I did read it may be good to heat the steel in coals for a couple hours then submerge it in water and then heat it with a torch to red hot and submerge it again. I will have to play with the heat treat thing to get something worthwhile. I would like to try and come up with some 440c stainless on the next one to see what working with stainless is like.