Steel knowledge

Iron alloys
''It appears that iron heated in contact with charcoal gets stronger but also more brittle. Too much of it and it becomes useless... But if we were to master the art of dosing and it properly and a process of how to apply it to iron, we could produce a metal far superior than everything we've ever seen so far: steel, at the right balance between flexibility and resistance.

Potential Requirements

 * Foundry 3, have iron ore stockpiled