Steel (CTP1)

Steel is an advance in Civilization: Call to Power.
== Summary ==
The fifth Sea Advance, Steel, ends the age of wooden ships and begins the reign of the Battleship, king of the Industrial and early Modern Age.
== Great Library entry ==
Advances in electricity and a new demand for high quality boilers led to the discovery first of the Bessemer furnace and then later of the Siemens furnace and the electric furnace. With these new smelting methods, Civilization could control the carbon content of steel, the key to strength and flexibility, and produce steel in quantity for the first time.
== See also ==
* Steel in other games