Most job shop machinists have torch hardened a grade 5 or grade 8 bolt to make an emergency tool. I've made lots of tooling for aircraft Aluminum out of bolts casehardened with Kasenite. Cherry Red or pack hardening them in an Ieon box with leather scraps, bone charcoal, and a bit of paper to burn up any Oxygen works, too. Mild steel heated just beyond red hot and plunged into Kasenite, then heated until it no longer attracted a magnet and quenched in water just as it came from the tap and used without tempering. Never gave me any problems with cracks either in quenching or use on tools up to 1-1/4 inch in diameter. The same with tool steel up to 1/2 inch in diameter.
I always use a salt / brine solution to quench harden water hardening steels otherwise, I use a heavy grade of mineral oil to quench harden O-1 steels. That bolt at 4:25 is NOT iron; it is mild steel.
@@elduderino1329 I don't know the carbon content of the bolt Yantoo is attempting to harden but I use only reputable steels purchased from places such as, McMaster- Carr, Castle Metals, Sheffield Spring steels and I currently have set to air harden small custom tools made from Air Hardening Tool Steel. I heat the steel to 1850° F, soak for 5 to 10 minutes then quench in cool air only. I prefer Air Hardening steels for tool manufacture due to it's low warpage and shrinkage.
чё то какой то хернёй он занимался, у него чё, обычных резцов нет, а эту алюмишку проще было той же болгаркой паз прошаманить и в крайнем напильничком края подшаманить - было бы в 10 раз быстрее, короче долбое... изм
