Heat Metal to work iron without a forge?

[Unoriginal]

The spell "Heat Metal" explicitly makes the metal red hot, the state required to work with iron via traditional smithing techniques.

So would you allow the spell to allow for blacksmithing in a situation where a forge wasn't available? Or where there's no coal or charcoal to heat the metal?

Heat Metal has a duration of 1 minute, so no, I wouldn't.

I mean you could use it to make an iron part more easily bendable, but it takes more than 1 minute to smith something.