There are a lot of videos on YouTube, with the title "How to harden a knife (nail) in graphite." In fact, the technologies described in the videos cannot be called HARDENING. It is rather cementation ... at home.
There are a lot of videos on YouTube, with the title "How to harden a knife (nail) in graphite." In fact, the technologies described in the videos cannot be called HARDENING. It is rather cementation ... at home.