Found under Blacksmithing, this is a very important structure that is available at level 1 blacksmithing. It is Non-movable permanent structure. It requires charcoal to light, and stays lit for 24 hours, although you can 'refill' it every few hours. (I suggest making charcoal piles - found in chemistry for 200 firewood- to keep up with your consumption rates.)
It is used to forge things out of scrap metal.
Can be purchased in shop for 1500 caps.
Fire brick x200
Iron pipe x10
I have built these in strategic, albeit, lesser home bases. One never wants to travel to far too fix her armor, unless you can afford to carry around a few sets,