VD furnace has functions such as vacuum degassing, argon blowing and stirring, and alloy fine-tuning. The molten steel treated by VD refining furnace can reduce the hydrogen, oxygen, and nitrogen content in the steel, promote the sufficient floating of inclusions, reduce the sulfur content, and thus improve the cleanliness of the steel. Therefore, VD furnace can refine steel grades with high quality requirements such as bearing steel pipes.