A revolutionary 19th century process to convert iron into high quality steel using a cauldron of molten iron and coke through which air was blown at high pressure and volume, oxidizing impurities and allowing the precise control of carbon content.
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Blasts of cold air were blow through heated iron to remove impurities. The result was much stronger more workable than steel.
When Bessemer developed his method of making steel the use of iron ore grew and so did making railroads, multistory buildings, and bridges.
Iron wasn't invented. It is an ore and comes from iron mines. Steel is made from iron using a process of heating the ore and then removing the impurities from the ore through blowing air through it. The man who came up with this process was named Bessemer and his method is still used today.