In order to reduce AOD refining slag amount and ferrosilicon amount

the thermodynamic analysis on high chromium steel liquid decarburization and slag basicity control in reducing process and the commercial test on slagging process for 304 stainless steel refining by 45 t AOD unit have been carried out. Pilot production results show that with decreasing slag basicity in decarburization period of 304 stainless steel during AOD refining

the oxidization of chromium in liquid shall be decreased

while it is available to decrease the consumption of AOD refining slag materials and reducing matter； during AOD refining process with decreasing the lime adding amount from average 104.2 kg/t to 84.2-93.1 kg/ t during AOD refining process the average basicity of slag decreases from 13. 44 to 10. 64 in decarburization period and the lime

fluorite and ferrosilicon consumption respectively reduce by 14.7 kg/t

5.4 kg/t and 4.4 kg/t

and the yield of Cr

yield of Ni and sulphur content in steel are respectively 99.0%

98.3% and 0.0025%.