Double of converter steelmaking process has the following characteristics:Adopted two combined-blowing converter joint operation, a converter as a dephosphorization furnace hot metal pretreatment, a converter as decarburization refining furnace.Completed in dephosphorization furnaces dephosphorization, part of the silicon and small amounts of desulfurization task, implement the converter molten iron three pretreatment.The mission of the refining furnace can significantly reduce, simplifying the steelmaking load to decarburization, heating up, which can greatly improve the oxygen supply intensity, achieve high efficiency of converter steelmaking (including automatic blowing technology adoption)Greatly improve the productivity of converter, as a result of using the dual method, two joint operation after the stove, precision casting smelting cycle is greatly shortened, still can reach the level two furnace blow 2 blowing.- due to realized the full amount of hot metal pretreatment, can be a substantial increase in the cost of, improve the molten steel purity.