This paper has introduced the abilities that the 30t VOD/VHD vacuum refining furnace had achieved for decarburizing and keeping chromium ,deoxidizing and degassing and purifying molten steel in vacuum, and analysed objectively technique level achieved of this vacuum metallurgical equipment , combining practice with the specialized theory.

Key points of smelting process,such as decarburization and Cr yield,thermal compensation,bottom blowing patterns,as well as high-efficiency desulphurization are discussed in the paper.

Aiming at the tristep method smelting process of stainless steel "electrical arc furnace+multifunction converter+VOD", and centering about dephosphorization, the theoretical analysis of the feasibility of related important link in process chain for dephosphorization and chromium conservation in the earlier stage of converter process was carried out based on metallurgical thermodynamics.