In order to optimize the metallurgical efifect of calcium treatment for DC01 produced by CSP process

the composition of the nozzle nodulation

the evolution and the characteristics of inclusions in steels treated by Ca and CaAl cored wire was analyzed by SEM + EDS

influence of Al on the yield of calcium was discussed. The results show that the nozzle nodulation are mainly composed of incompletely modified calcium aluminate

Al

2

O

3

andMgO· Al

2

O

3

. Variety of Al amount in steel has little influence on vapour pressure and yield of calcium. In the same conditions of feeding speed and adding amount of Ca cored wine

the amount of residual calcium and calcium yield were higher in the steel treated by Ca cored wire compared with CaAl cored wire

inclusions modification effect is better.