This is merely a combination of the Bessemer and open-hearth processes.

Pig metal is blown in an acid Bessemer converter until silicon, manganese, and part or all of the carbon are removed. It is then practically a molten steel high in phosphorus. From the converter it is conveyed to the basic open-hearth furnace for refining, for removal of the phosphorus, and for re-carburization.

The advantage claimed for this process is that it saves time, brings less wear and tear on the open-hearth furnace (which is the expensive furnace in steel making), and gives a better product than by the open-hearth process alone. It combines the acid process of the converter with the basic process of the furnace.