Abstract: The impurities of molten pig iron produced by a blast furnace are removed exclusively in a converter, according to the conventional steelmaking refining method.The desulfurization and dephosphorization, which have been conventionally achieved in a converter, are replaced by the desulfurization and dephosphorization during the pretreatment of the molten pig iron, according to recently developed steelmaking methods. In the multi-step steelmaking refining method, such oxygen-blowing as that employed for the conventional converter would result in a rather violent spitting and reduction in recovery of iron.It is an object of the present invention to provide a multi-phase steelmaking refining method, in which decarburization is carried out without causing the disadvantages in the prior art.