So I forged a bowie knife to rough shape from 02 some time back. I normalized it 3-4 times but when I tried filing it it felt like it was almost hardened. It didn't feel quite as hard as quenched 80 CrV2 but close. The annealing temperature is 680-720°C(http://www.astmsteel.com/product/aisi-o2-steel-tool/). I have tried this many times but it is still hard. I tried it several times with lower and higher temperatures for 15-30 minutes but with no luck. Should I anneal it longer ? If so how long ?
Thanks in advance!
Thanks in advance!