TLDR: Do I need map gas to melt a screw?

Been trying to get this hex screw out for about 4 hours and I’ve exhausted all my options. Tomorrow I’m going to slice a notch in it and see if I can get it with a flathead but if there’s no progress my next step is gonna be to melt this shit so my question is can I melt it with map gas or am I gonna need acetylene