Originally posted by ✪ All I do is eat:

Not a sword, a mace. With a molten effect. Not burning effect

The only weapon craftable from Flaming Metal ingots that can be found in the game by using console commands is Dyrnwyn the flaming sword.
I'm only guessing, but this will likely be implemented when Mistlands is released since smelting flaming metal ingots from flaming metal ore is already possible. As such you can expect it at the end of the year or more likely by Q2 of next year.
We shall just have to wait and see what other weapons and gear may be craftable at that time.
I'm looking forward to it and I suspect that the mobs which will inhabit/infest the Mistlands (spiders please) will be vulnerable to fire damage ;)