A precursor mixture of iron ore and coal, smelted in a concrete furnace to create steel.
The conditions on Icarus give its would-be metallurgists very little control over the finer details of steel smelting. A basic bloomery process prevails.
Craft at: Mortar and Pestle, Windmill, Material Processor
Craft at: Concrete Furnace, Electric Furnace, Stone Furnace, MXC Furnace
