Iron and Steel can be worked on a charcoal/wood fire. Maybe it won't be easy, but the scale of malleability is basically linear with temperature. Every 100 degr

Iron and Steel can be worked on a charcoal/wood fire. Maybe it won't be easy, but the scale of malleability is basically linear with temperature. Every 100 degrees and it gets a bit softer. Metallurgically, this won't necessarily yield the best parts if we can't reach critical temperatures - 1900°F, but even then, there are plenty of forgiving alloys out there, and plenty of metal that can be re-worked without melting it down. The bigger difficulty in my mind is having all the alloys identified. It is pretty business even with good modern tools.