Building the Steel Mill is going to test the player's resource strain, but this is a necessary step in order to reach any unit requiring Steel in order to work with. Players will need to bite the bullet and figure out a good way of getting 7,200 Iron while building their Concrete.
Once a player has a Steel Mill, they will keep it running as much as they can, because it is crucial to build themselves that tank battalion they always wanted. Not only that, but to keep said tanks running and out of repair, they're going to need lots of Steel.
To maximize production, players will place their buildings where visitors (Friends) will see them immediately when they open your world. This makes its easy for them to help the player.
After the 1.5 Patch, players can now upgrade Steel Mills for a higher Steel output.
Building 7 Large Warehouses would be one way to attain the amount of resources required and assisting (14 times for regular Iron Mines) friends for the rest of the iron required;or simply raiding would do too.