The reaction mechanism of refining slagging of aluminum deoxidized steel at Pangang Group Xichang Steel and Vanadium Co Ltd has been studied. According the theoretical analysis

the refining slag must be high alkalinity

high CaO activity

high melting rate and low melting temperature

therefore a new fluorine-free refining slag agent is proposed

its main ingredient is (/% ：17 CaO

45 A1

2

O

3

5Na

2

O/ MgO

5SiO

2

). The slagging agent has been applied at Xichang steel vanadium Co Ltd

the amount added in the LF process is controlled at about 0. 5 ~ 1.0 kg/t steel and good results have been achieved. The effect of submerged arc of new fluorin-free refining slag agent is good

the slag melting speed is fast

the time of slag formation about M3A35 some steel grades is only 3min

the ladle etching is obviously better than that using fluorite slag and the refractory material at the slag li

ne has no obvious corrosion.