Steel

Steel is a metal resource produced by Steel Mills.

Uses
Steel is used in HQ upgrades and the construction of most buildings:
 * Chemical Refinery
 * Electrolysis Reactor
 * Electronics Factory
 * Nuclear Plant
 * Geothermal Plant
 * Glass Kiln
 * Hydroponic Farm
 * Offworld Market
 * Optimization Center
 * Patent Lab
 * Pleasure Dome
 * Space Elevator
 * Water Processor
 * Water Pump