Armored human huh? The only way that I could even potentially see that as feasible is if there is some sort of generator to conjure that extreme temperature, but then you would have to deal with a couple of stipulations for that:
1) the generator would have to be part of the suit and not part of the human’s abilities
2) the suit would already have to be made of a material that has a higher melting point than steel, which would naturally be heavier and require additional mechanics/electronics to be able to move around freely.
3) there would need to be some other material that shields the human from the generator, or he’d be vaporized by the temperatures being charged to that degree.
Overall, I think it’s an overpowered design by normal standards. I don’t really know the context of the RP right now, but I’d say in most situations you wouldn’t want him to be able to develop a character in that fashion if he’s not able to provide some sort of logical progression in the making of the ability, along with safeguards, etc.