Abstract: Combined with production practice, the carbon content reasonably was controlled in scrapped charge process and during arc furnace to decrease peroxidation of molten steel, final slag composition was aimed during LF process to remove oxygen and sulphur deeply, vacuum degassing time and efficient vacuum degree was carried out during VD process, gas flow was controlled during back to LF process to reduce slag entrapment, the refining ladle was adopted during the whole steelmaking process and blowing argon around the ladle nozzle was carried out during VC process. Results shows final oxygen mass fraction of backup roll were all below 20×10-6 and forging inclusions in microscope was qualified, ultrasonic examination was qualified and inclusions exposure were effectively reduced during subsequent machining process.

Key words: backup rolls, refining slag, oxygen content, inclusion