Thank you all for your feedback, especially those who took the time to address the topic instead of judge a man based on his unintentional ignorance. Perhaps I should have researched first but it was a simple question looking for a straightforward answer. Blacksmithing is very hands on, and my only intention of trying to forge a rapier from rebar was to use low quality steel to practice on, on a project that was way out of my grasp, so that I could learn some stuff and have fun. Most of you assumed way too much about my intentions
The comment your made about "if somebody wanted to buy it and use it for say, sword on sword sparring, " was part of your posts statetd intention,