Iron refined into a more pure form. Steel is much more useful for advanced industrial needs than raw Iron, and is used in the construction of a bewildering array of items crucial to the survival of your Empire. The reason that you cannot have enough Iron is that you really cannot have enough Steel.... Improved Steel is both stronger and longer-lasting, and is extremely useful in the production of many advanced technologies.
3 Iron
1 ton
Resource
Content contributed by Raven Zachary.