Open hearth furnaces are one of a number of kinds of
furnace where excess carbon and other impurities are burnt out of
pig iron to
produce steel. Since
steel is difficult to manufacture due to its high
melting point, normal fuels and furnaces were insufficient and the open hearth furnace was developed to overcome this difficulty. Compared to
Bessemer steel, which it displaced, its main advantages were that it did not expose the steel to excessive nitrogen (which would cause the steel to become brittle), was easier to control, and it permitted the melting and refining of large amounts of scrap iron and steel.