Abstract：The properties of inclusions in the welding wire steel and phases of caster nozzles were investigated by SEM, and the forming mechanism of the nozzle clogging was also studied by thermodynamic calculation. The results shows that large amounts of Al2O3 and TiO2 inclusions exist in the molten steel at the end of LF refining, and precipitates on the inner nozzles to form the clogging of alumina type, titania type, and two both individually, the continuous heats are merely 4. By optimizing the relationship of ［Al］-［Ti］-［O］ to make the content of w(［Al］) above the equilibrium line between Al-Ti, w(［Ti］)/w(［Al］)4/3>84.49, and w(［Ti］)/w(［Al］)>7.46, when w(［Al］) less than 0.0068%, the Al2O3 inclusions decrease obviously, the nozzle clogging can be efficiently reduced, and the continuous casting heats increase to 6.
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