- Joined
- Jun 8, 2018
- Messages
- 98
I recently sent out a few blades to a professional heat treating company. Assuming the blades were going to come back with forge scale all over them I just left them at a dirty 120 grit. I was thinking I’m going to have to go back with an 80 grit when I got the blades back. Little did I know the blades came back perfectly clean. And hardened to 60hrc. Now no belts will touch the steel. I do two passes on a 120 ceramic and it cuts, then I sharpie the blade and take 6 more passes and no sharpie comes off. I have worked this steel for 3+ hours trying all combinations of belts. Also, when hand sanding (150,320,or 600) the oil isn’t turning black from material removal and no scratch lines are showing up. This is 440c stainless steel. Guys/gals..... I need help.