Experiment Research on Deep Desulphurization of Non-oriented Electrical Steel

In order to satisfy the requirements of consumers on sulfur content in non-oriented electrical steel,taking(CaO-CaF 2) based flux as desulfurizer,industrial experiments on deep desulphurization of non-oriented electrical steel were carried out during RH process. The results show that as the compositions of refining slag are appropriately controlled with w_CaO of 43%~51%,w_Al2O3 of 25%~31%,w_MgO of 4%~6%,w_SiO2 of 9%~12%,and w_{(FeO + MnO)} of 3%~6%,and the desulfurizer added are at 6~8 kg/t,the average sulfur content in liquid steel can be reduced from 32 × 10^-6 to 18 × 10^-6 with the average and highest desulphurization degrees of 43.3% and 47.1% respectively. Calculated with KTH model,the average sulfide capacity in final slag is 0.0031,and the average equilibrium distribution ratio of sulphur in the final slag increases from 14 to 52 at the end of refining in RH.