The Hagane is the second ship in the Space Noah Class of battleships. A total of six Space Noah Class ships are referenced as being constructed - the Shirogane, the Hagane, the Kurogane, and three additional ships, which are under construction on the moon during the events of Original Generation 2. Of the latter, the fourth ship of the class is known to have the same bow module as the Shirogane. This module is, during the events of OG2, installed on the Hagane, temporarily depriving the ship of its Tronium Buster Cannon.