HI, I am completely new to working with metal but am a pretty experienced woodworker. That being said im not an idiot but im also not sure on what I am doing most of the time. My biggest issue is when i make a knife, with material removal not forging, I heat the steel to a non magnetic state, pull it out and brush it and then put back in for a few mins and then pull out to normalize. I do this 3 times and on the final stage I dip in warm canola oil. When I pull it out of the oil I noticed large black spots everywhere and when I take it to the grinder I realized that the divots went so deep into the steel that the knife was ruined. It looked like it had rusted for 30 years and had extreme pitting. I have searched and searched and can not find anything on this issue. Im not sure if im using the proper terminology which could be the reason I cant find what I need. If this is the wrong spot to post please let me know and I will move. This is the first time on this forum, thanks for any help, tips, advice.