Analysis on refining effects of ladle furnace for pipeline steel

The refining effects of LF used in pipeline steel production in a specific Iron and Steel Works are analyzed and the influence of basicity of the refining slag on the T.O in steel,variation of(MnO+FeO) and mannesmann index(R/w(Al2O3))in the slag as well as the desulfurization effect of the slag are investigated.Results indicate that the basicity of refining slag can be controlled with the range of 5.47~7.53,which conforms to the specification of basicity for high quality steel grade.However the mass fraction of(MnO+FeO)is higher(2.0% on average) and the mannesmann index in the LF refining slag is lower relatively and thus the flow ability and inclusion absorb ability of the slag are jeopardized to some extent.The desulfurization rate arrives at 62.5% averagely in the process of LF refining and thus the desulfurization results are quite acceptable.