Produces Steel by carburization of wrough iron through smithing. Buildings Appearance Building Level Unlocked By Build Cost Base Efficiency Workers Profession 3 Steel 3 Saws 3 Clay 6 Bricks 2 Stoneblocs 0.5 3 Metallurgist 4 Decarburization 3 Pickaxe 5 Cement 10 Bricks 3 Stoneblocs 1 3 Metallurgist