I like working with railroad spikes. They make very interesting knives but they are not so keen to hold an edge. Don't think I needed to tell you all this but anyway, I have been looking in to case hardening but I am wrought with questions. I need to know the best way to get the most carbon into the steel just along the edge if nothing else.
Also, if I case harden, will I then need to temper the blade?
After I case harden, will sharpening the knife take the hardened layer off of the blade? Or can I repeat the case hardening so that I can get more carbon into the knife so that I can sharpen it many times?
Thanks guys.